2 * Copyright © 2008 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
32 #include "i915_trace.h"
33 #include "intel_drv.h"
34 #include <linux/slab.h>
35 #include <linux/swap.h>
36 #include <linux/pci.h>
38 static uint32_t i915_gem_get_gtt_alignment(struct drm_gem_object *obj);
39 static int i915_gem_object_flush_gpu_write_domain(struct drm_gem_object *obj);
40 static void i915_gem_object_flush_gtt_write_domain(struct drm_gem_object *obj);
41 static void i915_gem_object_flush_cpu_write_domain(struct drm_gem_object *obj);
42 static int i915_gem_object_set_to_cpu_domain(struct drm_gem_object *obj,
44 static int i915_gem_object_set_cpu_read_domain_range(struct drm_gem_object *obj,
47 static void i915_gem_object_set_to_full_cpu_read_domain(struct drm_gem_object *obj);
48 static int i915_gem_object_wait_rendering(struct drm_gem_object *obj);
49 static int i915_gem_object_bind_to_gtt(struct drm_gem_object *obj,
51 static void i915_gem_clear_fence_reg(struct drm_gem_object *obj);
52 static int i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
53 struct drm_i915_gem_pwrite *args,
54 struct drm_file *file_priv);
55 static void i915_gem_free_object_tail(struct drm_gem_object *obj);
57 static LIST_HEAD(shrink_list);
58 static DEFINE_SPINLOCK(shrink_list_lock);
61 i915_gem_object_is_inactive(struct drm_i915_gem_object *obj_priv)
63 return obj_priv->gtt_space &&
65 obj_priv->pin_count == 0;
68 int i915_gem_do_init(struct drm_device *dev, unsigned long start,
71 drm_i915_private_t *dev_priv = dev->dev_private;
74 (start & (PAGE_SIZE - 1)) != 0 ||
75 (end & (PAGE_SIZE - 1)) != 0) {
79 drm_mm_init(&dev_priv->mm.gtt_space, start,
82 dev->gtt_total = (uint32_t) (end - start);
88 i915_gem_init_ioctl(struct drm_device *dev, void *data,
89 struct drm_file *file_priv)
91 struct drm_i915_gem_init *args = data;
94 mutex_lock(&dev->struct_mutex);
95 ret = i915_gem_do_init(dev, args->gtt_start, args->gtt_end);
96 mutex_unlock(&dev->struct_mutex);
102 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
103 struct drm_file *file_priv)
105 struct drm_i915_gem_get_aperture *args = data;
107 if (!(dev->driver->driver_features & DRIVER_GEM))
110 args->aper_size = dev->gtt_total;
111 args->aper_available_size = (args->aper_size -
112 atomic_read(&dev->pin_memory));
119 * Creates a new mm object and returns a handle to it.
122 i915_gem_create_ioctl(struct drm_device *dev, void *data,
123 struct drm_file *file_priv)
125 struct drm_i915_gem_create *args = data;
126 struct drm_gem_object *obj;
130 args->size = roundup(args->size, PAGE_SIZE);
132 /* Allocate the new object */
133 obj = i915_gem_alloc_object(dev, args->size);
137 ret = drm_gem_handle_create(file_priv, obj, &handle);
138 drm_gem_object_unreference_unlocked(obj);
142 args->handle = handle;
148 fast_shmem_read(struct page **pages,
149 loff_t page_base, int page_offset,
156 vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
159 unwritten = __copy_to_user_inatomic(data, vaddr + page_offset, length);
160 kunmap_atomic(vaddr, KM_USER0);
168 static int i915_gem_object_needs_bit17_swizzle(struct drm_gem_object *obj)
170 drm_i915_private_t *dev_priv = obj->dev->dev_private;
171 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
173 return dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_9_10_17 &&
174 obj_priv->tiling_mode != I915_TILING_NONE;
178 slow_shmem_copy(struct page *dst_page,
180 struct page *src_page,
184 char *dst_vaddr, *src_vaddr;
186 dst_vaddr = kmap(dst_page);
187 src_vaddr = kmap(src_page);
189 memcpy(dst_vaddr + dst_offset, src_vaddr + src_offset, length);
196 slow_shmem_bit17_copy(struct page *gpu_page,
198 struct page *cpu_page,
203 char *gpu_vaddr, *cpu_vaddr;
205 /* Use the unswizzled path if this page isn't affected. */
206 if ((page_to_phys(gpu_page) & (1 << 17)) == 0) {
208 return slow_shmem_copy(cpu_page, cpu_offset,
209 gpu_page, gpu_offset, length);
211 return slow_shmem_copy(gpu_page, gpu_offset,
212 cpu_page, cpu_offset, length);
215 gpu_vaddr = kmap(gpu_page);
216 cpu_vaddr = kmap(cpu_page);
218 /* Copy the data, XORing A6 with A17 (1). The user already knows he's
219 * XORing with the other bits (A9 for Y, A9 and A10 for X)
222 int cacheline_end = ALIGN(gpu_offset + 1, 64);
223 int this_length = min(cacheline_end - gpu_offset, length);
224 int swizzled_gpu_offset = gpu_offset ^ 64;
227 memcpy(cpu_vaddr + cpu_offset,
228 gpu_vaddr + swizzled_gpu_offset,
231 memcpy(gpu_vaddr + swizzled_gpu_offset,
232 cpu_vaddr + cpu_offset,
235 cpu_offset += this_length;
236 gpu_offset += this_length;
237 length -= this_length;
245 * This is the fast shmem pread path, which attempts to copy_from_user directly
246 * from the backing pages of the object to the user's address space. On a
247 * fault, it fails so we can fall back to i915_gem_shmem_pwrite_slow().
250 i915_gem_shmem_pread_fast(struct drm_device *dev, struct drm_gem_object *obj,
251 struct drm_i915_gem_pread *args,
252 struct drm_file *file_priv)
254 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
256 loff_t offset, page_base;
257 char __user *user_data;
258 int page_offset, page_length;
261 user_data = (char __user *) (uintptr_t) args->data_ptr;
264 mutex_lock(&dev->struct_mutex);
266 ret = i915_gem_object_get_pages(obj, 0);
270 ret = i915_gem_object_set_cpu_read_domain_range(obj, args->offset,
275 obj_priv = to_intel_bo(obj);
276 offset = args->offset;
279 /* Operation in this page
281 * page_base = page offset within aperture
282 * page_offset = offset within page
283 * page_length = bytes to copy for this page
285 page_base = (offset & ~(PAGE_SIZE-1));
286 page_offset = offset & (PAGE_SIZE-1);
287 page_length = remain;
288 if ((page_offset + remain) > PAGE_SIZE)
289 page_length = PAGE_SIZE - page_offset;
291 ret = fast_shmem_read(obj_priv->pages,
292 page_base, page_offset,
293 user_data, page_length);
297 remain -= page_length;
298 user_data += page_length;
299 offset += page_length;
303 i915_gem_object_put_pages(obj);
305 mutex_unlock(&dev->struct_mutex);
311 i915_gem_object_get_pages_or_evict(struct drm_gem_object *obj)
315 ret = i915_gem_object_get_pages(obj, __GFP_NORETRY | __GFP_NOWARN);
317 /* If we've insufficient memory to map in the pages, attempt
318 * to make some space by throwing out some old buffers.
320 if (ret == -ENOMEM) {
321 struct drm_device *dev = obj->dev;
323 ret = i915_gem_evict_something(dev, obj->size,
324 i915_gem_get_gtt_alignment(obj));
328 ret = i915_gem_object_get_pages(obj, 0);
335 * This is the fallback shmem pread path, which allocates temporary storage
336 * in kernel space to copy_to_user into outside of the struct_mutex, so we
337 * can copy out of the object's backing pages while holding the struct mutex
338 * and not take page faults.
341 i915_gem_shmem_pread_slow(struct drm_device *dev, struct drm_gem_object *obj,
342 struct drm_i915_gem_pread *args,
343 struct drm_file *file_priv)
345 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
346 struct mm_struct *mm = current->mm;
347 struct page **user_pages;
349 loff_t offset, pinned_pages, i;
350 loff_t first_data_page, last_data_page, num_pages;
351 int shmem_page_index, shmem_page_offset;
352 int data_page_index, data_page_offset;
355 uint64_t data_ptr = args->data_ptr;
356 int do_bit17_swizzling;
360 /* Pin the user pages containing the data. We can't fault while
361 * holding the struct mutex, yet we want to hold it while
362 * dereferencing the user data.
364 first_data_page = data_ptr / PAGE_SIZE;
365 last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
366 num_pages = last_data_page - first_data_page + 1;
368 user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
369 if (user_pages == NULL)
372 down_read(&mm->mmap_sem);
373 pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
374 num_pages, 1, 0, user_pages, NULL);
375 up_read(&mm->mmap_sem);
376 if (pinned_pages < num_pages) {
378 goto fail_put_user_pages;
381 do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
383 mutex_lock(&dev->struct_mutex);
385 ret = i915_gem_object_get_pages_or_evict(obj);
389 ret = i915_gem_object_set_cpu_read_domain_range(obj, args->offset,
394 obj_priv = to_intel_bo(obj);
395 offset = args->offset;
398 /* Operation in this page
400 * shmem_page_index = page number within shmem file
401 * shmem_page_offset = offset within page in shmem file
402 * data_page_index = page number in get_user_pages return
403 * data_page_offset = offset with data_page_index page.
404 * page_length = bytes to copy for this page
406 shmem_page_index = offset / PAGE_SIZE;
407 shmem_page_offset = offset & ~PAGE_MASK;
408 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
409 data_page_offset = data_ptr & ~PAGE_MASK;
411 page_length = remain;
412 if ((shmem_page_offset + page_length) > PAGE_SIZE)
413 page_length = PAGE_SIZE - shmem_page_offset;
414 if ((data_page_offset + page_length) > PAGE_SIZE)
415 page_length = PAGE_SIZE - data_page_offset;
417 if (do_bit17_swizzling) {
418 slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
420 user_pages[data_page_index],
425 slow_shmem_copy(user_pages[data_page_index],
427 obj_priv->pages[shmem_page_index],
432 remain -= page_length;
433 data_ptr += page_length;
434 offset += page_length;
438 i915_gem_object_put_pages(obj);
440 mutex_unlock(&dev->struct_mutex);
442 for (i = 0; i < pinned_pages; i++) {
443 SetPageDirty(user_pages[i]);
444 page_cache_release(user_pages[i]);
446 drm_free_large(user_pages);
452 * Reads data from the object referenced by handle.
454 * On error, the contents of *data are undefined.
457 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
458 struct drm_file *file_priv)
460 struct drm_i915_gem_pread *args = data;
461 struct drm_gem_object *obj;
462 struct drm_i915_gem_object *obj_priv;
465 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
468 obj_priv = to_intel_bo(obj);
470 /* Bounds check source.
472 * XXX: This could use review for overflow issues...
474 if (args->offset > obj->size || args->size > obj->size ||
475 args->offset + args->size > obj->size) {
476 drm_gem_object_unreference_unlocked(obj);
480 if (i915_gem_object_needs_bit17_swizzle(obj)) {
481 ret = i915_gem_shmem_pread_slow(dev, obj, args, file_priv);
483 ret = i915_gem_shmem_pread_fast(dev, obj, args, file_priv);
485 ret = i915_gem_shmem_pread_slow(dev, obj, args,
489 drm_gem_object_unreference_unlocked(obj);
494 /* This is the fast write path which cannot handle
495 * page faults in the source data
499 fast_user_write(struct io_mapping *mapping,
500 loff_t page_base, int page_offset,
501 char __user *user_data,
505 unsigned long unwritten;
507 vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base, KM_USER0);
508 unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
510 io_mapping_unmap_atomic(vaddr_atomic, KM_USER0);
516 /* Here's the write path which can sleep for
521 slow_kernel_write(struct io_mapping *mapping,
522 loff_t gtt_base, int gtt_offset,
523 struct page *user_page, int user_offset,
526 char __iomem *dst_vaddr;
529 dst_vaddr = io_mapping_map_wc(mapping, gtt_base);
530 src_vaddr = kmap(user_page);
532 memcpy_toio(dst_vaddr + gtt_offset,
533 src_vaddr + user_offset,
537 io_mapping_unmap(dst_vaddr);
541 fast_shmem_write(struct page **pages,
542 loff_t page_base, int page_offset,
547 unsigned long unwritten;
549 vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
552 unwritten = __copy_from_user_inatomic(vaddr + page_offset, data, length);
553 kunmap_atomic(vaddr, KM_USER0);
561 * This is the fast pwrite path, where we copy the data directly from the
562 * user into the GTT, uncached.
565 i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
566 struct drm_i915_gem_pwrite *args,
567 struct drm_file *file_priv)
569 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
570 drm_i915_private_t *dev_priv = dev->dev_private;
572 loff_t offset, page_base;
573 char __user *user_data;
574 int page_offset, page_length;
577 user_data = (char __user *) (uintptr_t) args->data_ptr;
579 if (!access_ok(VERIFY_READ, user_data, remain))
583 mutex_lock(&dev->struct_mutex);
584 ret = i915_gem_object_pin(obj, 0);
586 mutex_unlock(&dev->struct_mutex);
589 ret = i915_gem_object_set_to_gtt_domain(obj, 1);
593 obj_priv = to_intel_bo(obj);
594 offset = obj_priv->gtt_offset + args->offset;
597 /* Operation in this page
599 * page_base = page offset within aperture
600 * page_offset = offset within page
601 * page_length = bytes to copy for this page
603 page_base = (offset & ~(PAGE_SIZE-1));
604 page_offset = offset & (PAGE_SIZE-1);
605 page_length = remain;
606 if ((page_offset + remain) > PAGE_SIZE)
607 page_length = PAGE_SIZE - page_offset;
609 ret = fast_user_write (dev_priv->mm.gtt_mapping, page_base,
610 page_offset, user_data, page_length);
612 /* If we get a fault while copying data, then (presumably) our
613 * source page isn't available. Return the error and we'll
614 * retry in the slow path.
619 remain -= page_length;
620 user_data += page_length;
621 offset += page_length;
625 i915_gem_object_unpin(obj);
626 mutex_unlock(&dev->struct_mutex);
632 * This is the fallback GTT pwrite path, which uses get_user_pages to pin
633 * the memory and maps it using kmap_atomic for copying.
635 * This code resulted in x11perf -rgb10text consuming about 10% more CPU
636 * than using i915_gem_gtt_pwrite_fast on a G45 (32-bit).
639 i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
640 struct drm_i915_gem_pwrite *args,
641 struct drm_file *file_priv)
643 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
644 drm_i915_private_t *dev_priv = dev->dev_private;
646 loff_t gtt_page_base, offset;
647 loff_t first_data_page, last_data_page, num_pages;
648 loff_t pinned_pages, i;
649 struct page **user_pages;
650 struct mm_struct *mm = current->mm;
651 int gtt_page_offset, data_page_offset, data_page_index, page_length;
653 uint64_t data_ptr = args->data_ptr;
657 /* Pin the user pages containing the data. We can't fault while
658 * holding the struct mutex, and all of the pwrite implementations
659 * want to hold it while dereferencing the user data.
661 first_data_page = data_ptr / PAGE_SIZE;
662 last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
663 num_pages = last_data_page - first_data_page + 1;
665 user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
666 if (user_pages == NULL)
669 down_read(&mm->mmap_sem);
670 pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
671 num_pages, 0, 0, user_pages, NULL);
672 up_read(&mm->mmap_sem);
673 if (pinned_pages < num_pages) {
675 goto out_unpin_pages;
678 mutex_lock(&dev->struct_mutex);
679 ret = i915_gem_object_pin(obj, 0);
683 ret = i915_gem_object_set_to_gtt_domain(obj, 1);
685 goto out_unpin_object;
687 obj_priv = to_intel_bo(obj);
688 offset = obj_priv->gtt_offset + args->offset;
691 /* Operation in this page
693 * gtt_page_base = page offset within aperture
694 * gtt_page_offset = offset within page in aperture
695 * data_page_index = page number in get_user_pages return
696 * data_page_offset = offset with data_page_index page.
697 * page_length = bytes to copy for this page
699 gtt_page_base = offset & PAGE_MASK;
700 gtt_page_offset = offset & ~PAGE_MASK;
701 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
702 data_page_offset = data_ptr & ~PAGE_MASK;
704 page_length = remain;
705 if ((gtt_page_offset + page_length) > PAGE_SIZE)
706 page_length = PAGE_SIZE - gtt_page_offset;
707 if ((data_page_offset + page_length) > PAGE_SIZE)
708 page_length = PAGE_SIZE - data_page_offset;
710 slow_kernel_write(dev_priv->mm.gtt_mapping,
711 gtt_page_base, gtt_page_offset,
712 user_pages[data_page_index],
716 remain -= page_length;
717 offset += page_length;
718 data_ptr += page_length;
722 i915_gem_object_unpin(obj);
724 mutex_unlock(&dev->struct_mutex);
726 for (i = 0; i < pinned_pages; i++)
727 page_cache_release(user_pages[i]);
728 drm_free_large(user_pages);
734 * This is the fast shmem pwrite path, which attempts to directly
735 * copy_from_user into the kmapped pages backing the object.
738 i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
739 struct drm_i915_gem_pwrite *args,
740 struct drm_file *file_priv)
742 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
744 loff_t offset, page_base;
745 char __user *user_data;
746 int page_offset, page_length;
749 user_data = (char __user *) (uintptr_t) args->data_ptr;
752 mutex_lock(&dev->struct_mutex);
754 ret = i915_gem_object_get_pages(obj, 0);
758 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
762 obj_priv = to_intel_bo(obj);
763 offset = args->offset;
767 /* Operation in this page
769 * page_base = page offset within aperture
770 * page_offset = offset within page
771 * page_length = bytes to copy for this page
773 page_base = (offset & ~(PAGE_SIZE-1));
774 page_offset = offset & (PAGE_SIZE-1);
775 page_length = remain;
776 if ((page_offset + remain) > PAGE_SIZE)
777 page_length = PAGE_SIZE - page_offset;
779 ret = fast_shmem_write(obj_priv->pages,
780 page_base, page_offset,
781 user_data, page_length);
785 remain -= page_length;
786 user_data += page_length;
787 offset += page_length;
791 i915_gem_object_put_pages(obj);
793 mutex_unlock(&dev->struct_mutex);
799 * This is the fallback shmem pwrite path, which uses get_user_pages to pin
800 * the memory and maps it using kmap_atomic for copying.
802 * This avoids taking mmap_sem for faulting on the user's address while the
803 * struct_mutex is held.
806 i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
807 struct drm_i915_gem_pwrite *args,
808 struct drm_file *file_priv)
810 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
811 struct mm_struct *mm = current->mm;
812 struct page **user_pages;
814 loff_t offset, pinned_pages, i;
815 loff_t first_data_page, last_data_page, num_pages;
816 int shmem_page_index, shmem_page_offset;
817 int data_page_index, data_page_offset;
820 uint64_t data_ptr = args->data_ptr;
821 int do_bit17_swizzling;
825 /* Pin the user pages containing the data. We can't fault while
826 * holding the struct mutex, and all of the pwrite implementations
827 * want to hold it while dereferencing the user data.
829 first_data_page = data_ptr / PAGE_SIZE;
830 last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
831 num_pages = last_data_page - first_data_page + 1;
833 user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
834 if (user_pages == NULL)
837 down_read(&mm->mmap_sem);
838 pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
839 num_pages, 0, 0, user_pages, NULL);
840 up_read(&mm->mmap_sem);
841 if (pinned_pages < num_pages) {
843 goto fail_put_user_pages;
846 do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
848 mutex_lock(&dev->struct_mutex);
850 ret = i915_gem_object_get_pages_or_evict(obj);
854 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
858 obj_priv = to_intel_bo(obj);
859 offset = args->offset;
863 /* Operation in this page
865 * shmem_page_index = page number within shmem file
866 * shmem_page_offset = offset within page in shmem file
867 * data_page_index = page number in get_user_pages return
868 * data_page_offset = offset with data_page_index page.
869 * page_length = bytes to copy for this page
871 shmem_page_index = offset / PAGE_SIZE;
872 shmem_page_offset = offset & ~PAGE_MASK;
873 data_page_index = data_ptr / PAGE_SIZE - first_data_page;
874 data_page_offset = data_ptr & ~PAGE_MASK;
876 page_length = remain;
877 if ((shmem_page_offset + page_length) > PAGE_SIZE)
878 page_length = PAGE_SIZE - shmem_page_offset;
879 if ((data_page_offset + page_length) > PAGE_SIZE)
880 page_length = PAGE_SIZE - data_page_offset;
882 if (do_bit17_swizzling) {
883 slow_shmem_bit17_copy(obj_priv->pages[shmem_page_index],
885 user_pages[data_page_index],
890 slow_shmem_copy(obj_priv->pages[shmem_page_index],
892 user_pages[data_page_index],
897 remain -= page_length;
898 data_ptr += page_length;
899 offset += page_length;
903 i915_gem_object_put_pages(obj);
905 mutex_unlock(&dev->struct_mutex);
907 for (i = 0; i < pinned_pages; i++)
908 page_cache_release(user_pages[i]);
909 drm_free_large(user_pages);
915 * Writes data to the object referenced by handle.
917 * On error, the contents of the buffer that were to be modified are undefined.
920 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
921 struct drm_file *file_priv)
923 struct drm_i915_gem_pwrite *args = data;
924 struct drm_gem_object *obj;
925 struct drm_i915_gem_object *obj_priv;
928 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
931 obj_priv = to_intel_bo(obj);
933 /* Bounds check destination.
935 * XXX: This could use review for overflow issues...
937 if (args->offset > obj->size || args->size > obj->size ||
938 args->offset + args->size > obj->size) {
939 drm_gem_object_unreference_unlocked(obj);
943 /* We can only do the GTT pwrite on untiled buffers, as otherwise
944 * it would end up going through the fenced access, and we'll get
945 * different detiling behavior between reading and writing.
946 * pread/pwrite currently are reading and writing from the CPU
947 * perspective, requiring manual detiling by the client.
949 if (obj_priv->phys_obj)
950 ret = i915_gem_phys_pwrite(dev, obj, args, file_priv);
951 else if (obj_priv->tiling_mode == I915_TILING_NONE &&
952 dev->gtt_total != 0 &&
953 obj->write_domain != I915_GEM_DOMAIN_CPU) {
954 ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file_priv);
955 if (ret == -EFAULT) {
956 ret = i915_gem_gtt_pwrite_slow(dev, obj, args,
959 } else if (i915_gem_object_needs_bit17_swizzle(obj)) {
960 ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file_priv);
962 ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file_priv);
963 if (ret == -EFAULT) {
964 ret = i915_gem_shmem_pwrite_slow(dev, obj, args,
971 DRM_INFO("pwrite failed %d\n", ret);
974 drm_gem_object_unreference_unlocked(obj);
980 * Called when user space prepares to use an object with the CPU, either
981 * through the mmap ioctl's mapping or a GTT mapping.
984 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
985 struct drm_file *file_priv)
987 struct drm_i915_private *dev_priv = dev->dev_private;
988 struct drm_i915_gem_set_domain *args = data;
989 struct drm_gem_object *obj;
990 struct drm_i915_gem_object *obj_priv;
991 uint32_t read_domains = args->read_domains;
992 uint32_t write_domain = args->write_domain;
995 if (!(dev->driver->driver_features & DRIVER_GEM))
998 /* Only handle setting domains to types used by the CPU. */
999 if (write_domain & I915_GEM_GPU_DOMAINS)
1002 if (read_domains & I915_GEM_GPU_DOMAINS)
1005 /* Having something in the write domain implies it's in the read
1006 * domain, and only that read domain. Enforce that in the request.
1008 if (write_domain != 0 && read_domains != write_domain)
1011 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1014 obj_priv = to_intel_bo(obj);
1016 mutex_lock(&dev->struct_mutex);
1018 intel_mark_busy(dev, obj);
1021 DRM_INFO("set_domain_ioctl %p(%zd), %08x %08x\n",
1022 obj, obj->size, read_domains, write_domain);
1024 if (read_domains & I915_GEM_DOMAIN_GTT) {
1025 ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
1027 /* Update the LRU on the fence for the CPU access that's
1030 if (obj_priv->fence_reg != I915_FENCE_REG_NONE) {
1031 struct drm_i915_fence_reg *reg =
1032 &dev_priv->fence_regs[obj_priv->fence_reg];
1033 list_move_tail(®->lru_list,
1034 &dev_priv->mm.fence_list);
1037 /* Silently promote "you're not bound, there was nothing to do"
1038 * to success, since the client was just asking us to
1039 * make sure everything was done.
1044 ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
1048 /* Maintain LRU order of "inactive" objects */
1049 if (ret == 0 && i915_gem_object_is_inactive(obj_priv))
1050 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
1052 drm_gem_object_unreference(obj);
1053 mutex_unlock(&dev->struct_mutex);
1058 * Called when user space has done writes to this buffer
1061 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1062 struct drm_file *file_priv)
1064 struct drm_i915_gem_sw_finish *args = data;
1065 struct drm_gem_object *obj;
1066 struct drm_i915_gem_object *obj_priv;
1069 if (!(dev->driver->driver_features & DRIVER_GEM))
1072 mutex_lock(&dev->struct_mutex);
1073 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1075 mutex_unlock(&dev->struct_mutex);
1080 DRM_INFO("%s: sw_finish %d (%p %zd)\n",
1081 __func__, args->handle, obj, obj->size);
1083 obj_priv = to_intel_bo(obj);
1085 /* Pinned buffers may be scanout, so flush the cache */
1086 if (obj_priv->pin_count)
1087 i915_gem_object_flush_cpu_write_domain(obj);
1089 drm_gem_object_unreference(obj);
1090 mutex_unlock(&dev->struct_mutex);
1095 * Maps the contents of an object, returning the address it is mapped
1098 * While the mapping holds a reference on the contents of the object, it doesn't
1099 * imply a ref on the object itself.
1102 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1103 struct drm_file *file_priv)
1105 struct drm_i915_gem_mmap *args = data;
1106 struct drm_gem_object *obj;
1110 if (!(dev->driver->driver_features & DRIVER_GEM))
1113 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1117 offset = args->offset;
1119 down_write(¤t->mm->mmap_sem);
1120 addr = do_mmap(obj->filp, 0, args->size,
1121 PROT_READ | PROT_WRITE, MAP_SHARED,
1123 up_write(¤t->mm->mmap_sem);
1124 drm_gem_object_unreference_unlocked(obj);
1125 if (IS_ERR((void *)addr))
1128 args->addr_ptr = (uint64_t) addr;
1134 * i915_gem_fault - fault a page into the GTT
1135 * vma: VMA in question
1138 * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1139 * from userspace. The fault handler takes care of binding the object to
1140 * the GTT (if needed), allocating and programming a fence register (again,
1141 * only if needed based on whether the old reg is still valid or the object
1142 * is tiled) and inserting a new PTE into the faulting process.
1144 * Note that the faulting process may involve evicting existing objects
1145 * from the GTT and/or fence registers to make room. So performance may
1146 * suffer if the GTT working set is large or there are few fence registers
1149 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1151 struct drm_gem_object *obj = vma->vm_private_data;
1152 struct drm_device *dev = obj->dev;
1153 drm_i915_private_t *dev_priv = dev->dev_private;
1154 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1155 pgoff_t page_offset;
1158 bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1160 /* We don't use vmf->pgoff since that has the fake offset */
1161 page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
1164 /* Now bind it into the GTT if needed */
1165 mutex_lock(&dev->struct_mutex);
1166 if (!obj_priv->gtt_space) {
1167 ret = i915_gem_object_bind_to_gtt(obj, 0);
1171 ret = i915_gem_object_set_to_gtt_domain(obj, write);
1176 /* Need a new fence register? */
1177 if (obj_priv->tiling_mode != I915_TILING_NONE) {
1178 ret = i915_gem_object_get_fence_reg(obj);
1183 if (i915_gem_object_is_inactive(obj_priv))
1184 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
1186 pfn = ((dev->agp->base + obj_priv->gtt_offset) >> PAGE_SHIFT) +
1189 /* Finally, remap it using the new GTT offset */
1190 ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
1192 mutex_unlock(&dev->struct_mutex);
1197 return VM_FAULT_NOPAGE;
1200 return VM_FAULT_OOM;
1202 return VM_FAULT_SIGBUS;
1207 * i915_gem_create_mmap_offset - create a fake mmap offset for an object
1208 * @obj: obj in question
1210 * GEM memory mapping works by handing back to userspace a fake mmap offset
1211 * it can use in a subsequent mmap(2) call. The DRM core code then looks
1212 * up the object based on the offset and sets up the various memory mapping
1215 * This routine allocates and attaches a fake offset for @obj.
1218 i915_gem_create_mmap_offset(struct drm_gem_object *obj)
1220 struct drm_device *dev = obj->dev;
1221 struct drm_gem_mm *mm = dev->mm_private;
1222 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1223 struct drm_map_list *list;
1224 struct drm_local_map *map;
1227 /* Set the object up for mmap'ing */
1228 list = &obj->map_list;
1229 list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
1234 map->type = _DRM_GEM;
1235 map->size = obj->size;
1238 /* Get a DRM GEM mmap offset allocated... */
1239 list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
1240 obj->size / PAGE_SIZE, 0, 0);
1241 if (!list->file_offset_node) {
1242 DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
1247 list->file_offset_node = drm_mm_get_block(list->file_offset_node,
1248 obj->size / PAGE_SIZE, 0);
1249 if (!list->file_offset_node) {
1254 list->hash.key = list->file_offset_node->start;
1255 if (drm_ht_insert_item(&mm->offset_hash, &list->hash)) {
1256 DRM_ERROR("failed to add to map hash\n");
1261 /* By now we should be all set, any drm_mmap request on the offset
1262 * below will get to our mmap & fault handler */
1263 obj_priv->mmap_offset = ((uint64_t) list->hash.key) << PAGE_SHIFT;
1268 drm_mm_put_block(list->file_offset_node);
1276 * i915_gem_release_mmap - remove physical page mappings
1277 * @obj: obj in question
1279 * Preserve the reservation of the mmapping with the DRM core code, but
1280 * relinquish ownership of the pages back to the system.
1282 * It is vital that we remove the page mapping if we have mapped a tiled
1283 * object through the GTT and then lose the fence register due to
1284 * resource pressure. Similarly if the object has been moved out of the
1285 * aperture, than pages mapped into userspace must be revoked. Removing the
1286 * mapping will then trigger a page fault on the next user access, allowing
1287 * fixup by i915_gem_fault().
1290 i915_gem_release_mmap(struct drm_gem_object *obj)
1292 struct drm_device *dev = obj->dev;
1293 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1295 if (dev->dev_mapping)
1296 unmap_mapping_range(dev->dev_mapping,
1297 obj_priv->mmap_offset, obj->size, 1);
1301 i915_gem_free_mmap_offset(struct drm_gem_object *obj)
1303 struct drm_device *dev = obj->dev;
1304 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1305 struct drm_gem_mm *mm = dev->mm_private;
1306 struct drm_map_list *list;
1308 list = &obj->map_list;
1309 drm_ht_remove_item(&mm->offset_hash, &list->hash);
1311 if (list->file_offset_node) {
1312 drm_mm_put_block(list->file_offset_node);
1313 list->file_offset_node = NULL;
1321 obj_priv->mmap_offset = 0;
1325 * i915_gem_get_gtt_alignment - return required GTT alignment for an object
1326 * @obj: object to check
1328 * Return the required GTT alignment for an object, taking into account
1329 * potential fence register mapping if needed.
1332 i915_gem_get_gtt_alignment(struct drm_gem_object *obj)
1334 struct drm_device *dev = obj->dev;
1335 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1339 * Minimum alignment is 4k (GTT page size), but might be greater
1340 * if a fence register is needed for the object.
1342 if (IS_I965G(dev) || obj_priv->tiling_mode == I915_TILING_NONE)
1346 * Previous chips need to be aligned to the size of the smallest
1347 * fence register that can contain the object.
1354 for (i = start; i < obj->size; i <<= 1)
1361 * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
1363 * @data: GTT mapping ioctl data
1364 * @file_priv: GEM object info
1366 * Simply returns the fake offset to userspace so it can mmap it.
1367 * The mmap call will end up in drm_gem_mmap(), which will set things
1368 * up so we can get faults in the handler above.
1370 * The fault handler will take care of binding the object into the GTT
1371 * (since it may have been evicted to make room for something), allocating
1372 * a fence register, and mapping the appropriate aperture address into
1376 i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
1377 struct drm_file *file_priv)
1379 struct drm_i915_gem_mmap_gtt *args = data;
1380 struct drm_gem_object *obj;
1381 struct drm_i915_gem_object *obj_priv;
1384 if (!(dev->driver->driver_features & DRIVER_GEM))
1387 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
1391 mutex_lock(&dev->struct_mutex);
1393 obj_priv = to_intel_bo(obj);
1395 if (obj_priv->madv != I915_MADV_WILLNEED) {
1396 DRM_ERROR("Attempting to mmap a purgeable buffer\n");
1397 drm_gem_object_unreference(obj);
1398 mutex_unlock(&dev->struct_mutex);
1403 if (!obj_priv->mmap_offset) {
1404 ret = i915_gem_create_mmap_offset(obj);
1406 drm_gem_object_unreference(obj);
1407 mutex_unlock(&dev->struct_mutex);
1412 args->offset = obj_priv->mmap_offset;
1415 * Pull it into the GTT so that we have a page list (makes the
1416 * initial fault faster and any subsequent flushing possible).
1418 if (!obj_priv->agp_mem) {
1419 ret = i915_gem_object_bind_to_gtt(obj, 0);
1421 drm_gem_object_unreference(obj);
1422 mutex_unlock(&dev->struct_mutex);
1427 drm_gem_object_unreference(obj);
1428 mutex_unlock(&dev->struct_mutex);
1434 i915_gem_object_put_pages(struct drm_gem_object *obj)
1436 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1437 int page_count = obj->size / PAGE_SIZE;
1440 BUG_ON(obj_priv->pages_refcount == 0);
1441 BUG_ON(obj_priv->madv == __I915_MADV_PURGED);
1443 if (--obj_priv->pages_refcount != 0)
1446 if (obj_priv->tiling_mode != I915_TILING_NONE)
1447 i915_gem_object_save_bit_17_swizzle(obj);
1449 if (obj_priv->madv == I915_MADV_DONTNEED)
1450 obj_priv->dirty = 0;
1452 for (i = 0; i < page_count; i++) {
1453 if (obj_priv->dirty)
1454 set_page_dirty(obj_priv->pages[i]);
1456 if (obj_priv->madv == I915_MADV_WILLNEED)
1457 mark_page_accessed(obj_priv->pages[i]);
1459 page_cache_release(obj_priv->pages[i]);
1461 obj_priv->dirty = 0;
1463 drm_free_large(obj_priv->pages);
1464 obj_priv->pages = NULL;
1468 i915_gem_object_move_to_active(struct drm_gem_object *obj, uint32_t seqno,
1469 struct intel_ring_buffer *ring)
1471 struct drm_device *dev = obj->dev;
1472 drm_i915_private_t *dev_priv = dev->dev_private;
1473 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1474 BUG_ON(ring == NULL);
1475 obj_priv->ring = ring;
1477 /* Add a reference if we're newly entering the active list. */
1478 if (!obj_priv->active) {
1479 drm_gem_object_reference(obj);
1480 obj_priv->active = 1;
1482 /* Move from whatever list we were on to the tail of execution. */
1483 spin_lock(&dev_priv->mm.active_list_lock);
1484 list_move_tail(&obj_priv->list, &ring->active_list);
1485 spin_unlock(&dev_priv->mm.active_list_lock);
1486 obj_priv->last_rendering_seqno = seqno;
1490 i915_gem_object_move_to_flushing(struct drm_gem_object *obj)
1492 struct drm_device *dev = obj->dev;
1493 drm_i915_private_t *dev_priv = dev->dev_private;
1494 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1496 BUG_ON(!obj_priv->active);
1497 list_move_tail(&obj_priv->list, &dev_priv->mm.flushing_list);
1498 obj_priv->last_rendering_seqno = 0;
1501 /* Immediately discard the backing storage */
1503 i915_gem_object_truncate(struct drm_gem_object *obj)
1505 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1506 struct inode *inode;
1508 /* Our goal here is to return as much of the memory as
1509 * is possible back to the system as we are called from OOM.
1510 * To do this we must instruct the shmfs to drop all of its
1511 * backing pages, *now*. Here we mirror the actions taken
1512 * when by shmem_delete_inode() to release the backing store.
1514 inode = obj->filp->f_path.dentry->d_inode;
1515 truncate_inode_pages(inode->i_mapping, 0);
1516 if (inode->i_op->truncate_range)
1517 inode->i_op->truncate_range(inode, 0, (loff_t)-1);
1519 obj_priv->madv = __I915_MADV_PURGED;
1523 i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj_priv)
1525 return obj_priv->madv == I915_MADV_DONTNEED;
1529 i915_gem_object_move_to_inactive(struct drm_gem_object *obj)
1531 struct drm_device *dev = obj->dev;
1532 drm_i915_private_t *dev_priv = dev->dev_private;
1533 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1535 i915_verify_inactive(dev, __FILE__, __LINE__);
1536 if (obj_priv->pin_count != 0)
1537 list_del_init(&obj_priv->list);
1539 list_move_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
1541 BUG_ON(!list_empty(&obj_priv->gpu_write_list));
1543 obj_priv->last_rendering_seqno = 0;
1544 obj_priv->ring = NULL;
1545 if (obj_priv->active) {
1546 obj_priv->active = 0;
1547 drm_gem_object_unreference(obj);
1549 i915_verify_inactive(dev, __FILE__, __LINE__);
1553 i915_gem_process_flushing_list(struct drm_device *dev,
1554 uint32_t flush_domains, uint32_t seqno,
1555 struct intel_ring_buffer *ring)
1557 drm_i915_private_t *dev_priv = dev->dev_private;
1558 struct drm_i915_gem_object *obj_priv, *next;
1560 list_for_each_entry_safe(obj_priv, next,
1561 &dev_priv->mm.gpu_write_list,
1563 struct drm_gem_object *obj = &obj_priv->base;
1565 if ((obj->write_domain & flush_domains) ==
1566 obj->write_domain &&
1567 obj_priv->ring->ring_flag == ring->ring_flag) {
1568 uint32_t old_write_domain = obj->write_domain;
1570 obj->write_domain = 0;
1571 list_del_init(&obj_priv->gpu_write_list);
1572 i915_gem_object_move_to_active(obj, seqno, ring);
1574 /* update the fence lru list */
1575 if (obj_priv->fence_reg != I915_FENCE_REG_NONE) {
1576 struct drm_i915_fence_reg *reg =
1577 &dev_priv->fence_regs[obj_priv->fence_reg];
1578 list_move_tail(®->lru_list,
1579 &dev_priv->mm.fence_list);
1582 trace_i915_gem_object_change_domain(obj,
1590 i915_add_request(struct drm_device *dev, struct drm_file *file_priv,
1591 uint32_t flush_domains, struct intel_ring_buffer *ring)
1593 drm_i915_private_t *dev_priv = dev->dev_private;
1594 struct drm_i915_file_private *i915_file_priv = NULL;
1595 struct drm_i915_gem_request *request;
1599 if (file_priv != NULL)
1600 i915_file_priv = file_priv->driver_priv;
1602 request = kzalloc(sizeof(*request), GFP_KERNEL);
1603 if (request == NULL)
1606 seqno = ring->add_request(dev, ring, file_priv, flush_domains);
1608 request->seqno = seqno;
1609 request->ring = ring;
1610 request->emitted_jiffies = jiffies;
1611 was_empty = list_empty(&ring->request_list);
1612 list_add_tail(&request->list, &ring->request_list);
1614 if (i915_file_priv) {
1615 list_add_tail(&request->client_list,
1616 &i915_file_priv->mm.request_list);
1618 INIT_LIST_HEAD(&request->client_list);
1621 /* Associate any objects on the flushing list matching the write
1622 * domain we're flushing with our flush.
1624 if (flush_domains != 0)
1625 i915_gem_process_flushing_list(dev, flush_domains, seqno, ring);
1627 if (!dev_priv->mm.suspended) {
1628 mod_timer(&dev_priv->hangcheck_timer, jiffies + DRM_I915_HANGCHECK_PERIOD);
1630 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
1636 * Command execution barrier
1638 * Ensures that all commands in the ring are finished
1639 * before signalling the CPU
1642 i915_retire_commands(struct drm_device *dev, struct intel_ring_buffer *ring)
1644 uint32_t flush_domains = 0;
1646 /* The sampler always gets flushed on i965 (sigh) */
1648 flush_domains |= I915_GEM_DOMAIN_SAMPLER;
1650 ring->flush(dev, ring,
1651 I915_GEM_DOMAIN_COMMAND, flush_domains);
1652 return flush_domains;
1656 * Moves buffers associated only with the given active seqno from the active
1657 * to inactive list, potentially freeing them.
1660 i915_gem_retire_request(struct drm_device *dev,
1661 struct drm_i915_gem_request *request)
1663 drm_i915_private_t *dev_priv = dev->dev_private;
1665 trace_i915_gem_request_retire(dev, request->seqno);
1667 /* Move any buffers on the active list that are no longer referenced
1668 * by the ringbuffer to the flushing/inactive lists as appropriate.
1670 spin_lock(&dev_priv->mm.active_list_lock);
1671 while (!list_empty(&request->ring->active_list)) {
1672 struct drm_gem_object *obj;
1673 struct drm_i915_gem_object *obj_priv;
1675 obj_priv = list_first_entry(&request->ring->active_list,
1676 struct drm_i915_gem_object,
1678 obj = &obj_priv->base;
1680 /* If the seqno being retired doesn't match the oldest in the
1681 * list, then the oldest in the list must still be newer than
1684 if (obj_priv->last_rendering_seqno != request->seqno)
1688 DRM_INFO("%s: retire %d moves to inactive list %p\n",
1689 __func__, request->seqno, obj);
1692 if (obj->write_domain != 0)
1693 i915_gem_object_move_to_flushing(obj);
1695 /* Take a reference on the object so it won't be
1696 * freed while the spinlock is held. The list
1697 * protection for this spinlock is safe when breaking
1698 * the lock like this since the next thing we do
1699 * is just get the head of the list again.
1701 drm_gem_object_reference(obj);
1702 i915_gem_object_move_to_inactive(obj);
1703 spin_unlock(&dev_priv->mm.active_list_lock);
1704 drm_gem_object_unreference(obj);
1705 spin_lock(&dev_priv->mm.active_list_lock);
1709 spin_unlock(&dev_priv->mm.active_list_lock);
1713 * Returns true if seq1 is later than seq2.
1716 i915_seqno_passed(uint32_t seq1, uint32_t seq2)
1718 return (int32_t)(seq1 - seq2) >= 0;
1722 i915_get_gem_seqno(struct drm_device *dev,
1723 struct intel_ring_buffer *ring)
1725 return ring->get_gem_seqno(dev, ring);
1729 * This function clears the request list as sequence numbers are passed.
1732 i915_gem_retire_requests_ring(struct drm_device *dev,
1733 struct intel_ring_buffer *ring)
1735 drm_i915_private_t *dev_priv = dev->dev_private;
1738 if (!ring->status_page.page_addr
1739 || list_empty(&ring->request_list))
1742 seqno = i915_get_gem_seqno(dev, ring);
1744 while (!list_empty(&ring->request_list)) {
1745 struct drm_i915_gem_request *request;
1746 uint32_t retiring_seqno;
1748 request = list_first_entry(&ring->request_list,
1749 struct drm_i915_gem_request,
1751 retiring_seqno = request->seqno;
1753 if (i915_seqno_passed(seqno, retiring_seqno) ||
1754 atomic_read(&dev_priv->mm.wedged)) {
1755 i915_gem_retire_request(dev, request);
1757 list_del(&request->list);
1758 list_del(&request->client_list);
1764 if (unlikely (dev_priv->trace_irq_seqno &&
1765 i915_seqno_passed(dev_priv->trace_irq_seqno, seqno))) {
1767 ring->user_irq_put(dev, ring);
1768 dev_priv->trace_irq_seqno = 0;
1773 i915_gem_retire_requests(struct drm_device *dev)
1775 drm_i915_private_t *dev_priv = dev->dev_private;
1777 if (!list_empty(&dev_priv->mm.deferred_free_list)) {
1778 struct drm_i915_gem_object *obj_priv, *tmp;
1780 /* We must be careful that during unbind() we do not
1781 * accidentally infinitely recurse into retire requests.
1783 * retire -> free -> unbind -> wait -> retire_ring
1785 list_for_each_entry_safe(obj_priv, tmp,
1786 &dev_priv->mm.deferred_free_list,
1788 i915_gem_free_object_tail(&obj_priv->base);
1791 i915_gem_retire_requests_ring(dev, &dev_priv->render_ring);
1793 i915_gem_retire_requests_ring(dev, &dev_priv->bsd_ring);
1797 i915_gem_retire_work_handler(struct work_struct *work)
1799 drm_i915_private_t *dev_priv;
1800 struct drm_device *dev;
1802 dev_priv = container_of(work, drm_i915_private_t,
1803 mm.retire_work.work);
1804 dev = dev_priv->dev;
1806 mutex_lock(&dev->struct_mutex);
1807 i915_gem_retire_requests(dev);
1809 if (!dev_priv->mm.suspended &&
1810 (!list_empty(&dev_priv->render_ring.request_list) ||
1812 !list_empty(&dev_priv->bsd_ring.request_list))))
1813 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
1814 mutex_unlock(&dev->struct_mutex);
1818 i915_do_wait_request(struct drm_device *dev, uint32_t seqno,
1819 int interruptible, struct intel_ring_buffer *ring)
1821 drm_i915_private_t *dev_priv = dev->dev_private;
1827 if (atomic_read(&dev_priv->mm.wedged))
1830 if (!i915_seqno_passed(ring->get_gem_seqno(dev, ring), seqno)) {
1831 if (HAS_PCH_SPLIT(dev))
1832 ier = I915_READ(DEIER) | I915_READ(GTIER);
1834 ier = I915_READ(IER);
1836 DRM_ERROR("something (likely vbetool) disabled "
1837 "interrupts, re-enabling\n");
1838 i915_driver_irq_preinstall(dev);
1839 i915_driver_irq_postinstall(dev);
1842 trace_i915_gem_request_wait_begin(dev, seqno);
1844 ring->waiting_gem_seqno = seqno;
1845 ring->user_irq_get(dev, ring);
1847 ret = wait_event_interruptible(ring->irq_queue,
1849 ring->get_gem_seqno(dev, ring), seqno)
1850 || atomic_read(&dev_priv->mm.wedged));
1852 wait_event(ring->irq_queue,
1854 ring->get_gem_seqno(dev, ring), seqno)
1855 || atomic_read(&dev_priv->mm.wedged));
1857 ring->user_irq_put(dev, ring);
1858 ring->waiting_gem_seqno = 0;
1860 trace_i915_gem_request_wait_end(dev, seqno);
1862 if (atomic_read(&dev_priv->mm.wedged))
1865 if (ret && ret != -ERESTARTSYS)
1866 DRM_ERROR("%s returns %d (awaiting %d at %d)\n",
1867 __func__, ret, seqno, ring->get_gem_seqno(dev, ring));
1869 /* Directly dispatch request retiring. While we have the work queue
1870 * to handle this, the waiter on a request often wants an associated
1871 * buffer to have made it to the inactive list, and we would need
1872 * a separate wait queue to handle that.
1875 i915_gem_retire_requests_ring(dev, ring);
1881 * Waits for a sequence number to be signaled, and cleans up the
1882 * request and object lists appropriately for that event.
1885 i915_wait_request(struct drm_device *dev, uint32_t seqno,
1886 struct intel_ring_buffer *ring)
1888 return i915_do_wait_request(dev, seqno, 1, ring);
1892 i915_gem_flush(struct drm_device *dev,
1893 uint32_t invalidate_domains,
1894 uint32_t flush_domains)
1896 drm_i915_private_t *dev_priv = dev->dev_private;
1897 if (flush_domains & I915_GEM_DOMAIN_CPU)
1898 drm_agp_chipset_flush(dev);
1899 dev_priv->render_ring.flush(dev, &dev_priv->render_ring,
1904 dev_priv->bsd_ring.flush(dev, &dev_priv->bsd_ring,
1910 * Ensures that all rendering to the object has completed and the object is
1911 * safe to unbind from the GTT or access from the CPU.
1914 i915_gem_object_wait_rendering(struct drm_gem_object *obj)
1916 struct drm_device *dev = obj->dev;
1917 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1920 /* This function only exists to support waiting for existing rendering,
1921 * not for emitting required flushes.
1923 BUG_ON((obj->write_domain & I915_GEM_GPU_DOMAINS) != 0);
1925 /* If there is rendering queued on the buffer being evicted, wait for
1928 if (obj_priv->active) {
1930 DRM_INFO("%s: object %p wait for seqno %08x\n",
1931 __func__, obj, obj_priv->last_rendering_seqno);
1933 ret = i915_wait_request(dev,
1934 obj_priv->last_rendering_seqno, obj_priv->ring);
1943 * Unbinds an object from the GTT aperture.
1946 i915_gem_object_unbind(struct drm_gem_object *obj)
1948 struct drm_device *dev = obj->dev;
1949 drm_i915_private_t *dev_priv = dev->dev_private;
1950 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
1954 DRM_INFO("%s:%d %p\n", __func__, __LINE__, obj);
1955 DRM_INFO("gtt_space %p\n", obj_priv->gtt_space);
1957 if (obj_priv->gtt_space == NULL)
1960 if (obj_priv->pin_count != 0) {
1961 DRM_ERROR("Attempting to unbind pinned buffer\n");
1965 /* blow away mappings if mapped through GTT */
1966 i915_gem_release_mmap(obj);
1968 /* Move the object to the CPU domain to ensure that
1969 * any possible CPU writes while it's not in the GTT
1970 * are flushed when we go to remap it. This will
1971 * also ensure that all pending GPU writes are finished
1974 ret = i915_gem_object_set_to_cpu_domain(obj, 1);
1975 if (ret == -ERESTARTSYS)
1977 /* Continue on if we fail due to EIO, the GPU is hung so we
1978 * should be safe and we need to cleanup or else we might
1979 * cause memory corruption through use-after-free.
1982 /* release the fence reg _after_ flushing */
1983 if (obj_priv->fence_reg != I915_FENCE_REG_NONE)
1984 i915_gem_clear_fence_reg(obj);
1986 if (obj_priv->agp_mem != NULL) {
1987 drm_unbind_agp(obj_priv->agp_mem);
1988 drm_free_agp(obj_priv->agp_mem, obj->size / PAGE_SIZE);
1989 obj_priv->agp_mem = NULL;
1992 i915_gem_object_put_pages(obj);
1993 BUG_ON(obj_priv->pages_refcount);
1995 if (obj_priv->gtt_space) {
1996 atomic_dec(&dev->gtt_count);
1997 atomic_sub(obj->size, &dev->gtt_memory);
1999 drm_mm_put_block(obj_priv->gtt_space);
2000 obj_priv->gtt_space = NULL;
2003 /* Remove ourselves from the LRU list if present. */
2004 spin_lock(&dev_priv->mm.active_list_lock);
2005 if (!list_empty(&obj_priv->list))
2006 list_del_init(&obj_priv->list);
2007 spin_unlock(&dev_priv->mm.active_list_lock);
2009 if (i915_gem_object_is_purgeable(obj_priv))
2010 i915_gem_object_truncate(obj);
2012 trace_i915_gem_object_unbind(obj);
2018 i915_gpu_idle(struct drm_device *dev)
2020 drm_i915_private_t *dev_priv = dev->dev_private;
2022 uint32_t seqno1, seqno2;
2025 spin_lock(&dev_priv->mm.active_list_lock);
2026 lists_empty = (list_empty(&dev_priv->mm.flushing_list) &&
2027 list_empty(&dev_priv->render_ring.active_list) &&
2029 list_empty(&dev_priv->bsd_ring.active_list)));
2030 spin_unlock(&dev_priv->mm.active_list_lock);
2035 /* Flush everything onto the inactive list. */
2036 i915_gem_flush(dev, I915_GEM_GPU_DOMAINS, I915_GEM_GPU_DOMAINS);
2037 seqno1 = i915_add_request(dev, NULL, I915_GEM_GPU_DOMAINS,
2038 &dev_priv->render_ring);
2041 ret = i915_wait_request(dev, seqno1, &dev_priv->render_ring);
2044 seqno2 = i915_add_request(dev, NULL, I915_GEM_GPU_DOMAINS,
2045 &dev_priv->bsd_ring);
2049 ret = i915_wait_request(dev, seqno2, &dev_priv->bsd_ring);
2059 i915_gem_object_get_pages(struct drm_gem_object *obj,
2062 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2064 struct address_space *mapping;
2065 struct inode *inode;
2068 BUG_ON(obj_priv->pages_refcount
2069 == DRM_I915_GEM_OBJECT_MAX_PAGES_REFCOUNT);
2071 if (obj_priv->pages_refcount++ != 0)
2074 /* Get the list of pages out of our struct file. They'll be pinned
2075 * at this point until we release them.
2077 page_count = obj->size / PAGE_SIZE;
2078 BUG_ON(obj_priv->pages != NULL);
2079 obj_priv->pages = drm_calloc_large(page_count, sizeof(struct page *));
2080 if (obj_priv->pages == NULL) {
2081 obj_priv->pages_refcount--;
2085 inode = obj->filp->f_path.dentry->d_inode;
2086 mapping = inode->i_mapping;
2087 for (i = 0; i < page_count; i++) {
2088 page = read_cache_page_gfp(mapping, i,
2096 obj_priv->pages[i] = page;
2099 if (obj_priv->tiling_mode != I915_TILING_NONE)
2100 i915_gem_object_do_bit_17_swizzle(obj);
2106 page_cache_release(obj_priv->pages[i]);
2108 drm_free_large(obj_priv->pages);
2109 obj_priv->pages = NULL;
2110 obj_priv->pages_refcount--;
2111 return PTR_ERR(page);
2114 static void sandybridge_write_fence_reg(struct drm_i915_fence_reg *reg)
2116 struct drm_gem_object *obj = reg->obj;
2117 struct drm_device *dev = obj->dev;
2118 drm_i915_private_t *dev_priv = dev->dev_private;
2119 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2120 int regnum = obj_priv->fence_reg;
2123 val = (uint64_t)((obj_priv->gtt_offset + obj->size - 4096) &
2125 val |= obj_priv->gtt_offset & 0xfffff000;
2126 val |= (uint64_t)((obj_priv->stride / 128) - 1) <<
2127 SANDYBRIDGE_FENCE_PITCH_SHIFT;
2129 if (obj_priv->tiling_mode == I915_TILING_Y)
2130 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2131 val |= I965_FENCE_REG_VALID;
2133 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 + (regnum * 8), val);
2136 static void i965_write_fence_reg(struct drm_i915_fence_reg *reg)
2138 struct drm_gem_object *obj = reg->obj;
2139 struct drm_device *dev = obj->dev;
2140 drm_i915_private_t *dev_priv = dev->dev_private;
2141 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2142 int regnum = obj_priv->fence_reg;
2145 val = (uint64_t)((obj_priv->gtt_offset + obj->size - 4096) &
2147 val |= obj_priv->gtt_offset & 0xfffff000;
2148 val |= ((obj_priv->stride / 128) - 1) << I965_FENCE_PITCH_SHIFT;
2149 if (obj_priv->tiling_mode == I915_TILING_Y)
2150 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2151 val |= I965_FENCE_REG_VALID;
2153 I915_WRITE64(FENCE_REG_965_0 + (regnum * 8), val);
2156 static void i915_write_fence_reg(struct drm_i915_fence_reg *reg)
2158 struct drm_gem_object *obj = reg->obj;
2159 struct drm_device *dev = obj->dev;
2160 drm_i915_private_t *dev_priv = dev->dev_private;
2161 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2162 int regnum = obj_priv->fence_reg;
2164 uint32_t fence_reg, val;
2167 if ((obj_priv->gtt_offset & ~I915_FENCE_START_MASK) ||
2168 (obj_priv->gtt_offset & (obj->size - 1))) {
2169 WARN(1, "%s: object 0x%08x not 1M or size (0x%zx) aligned\n",
2170 __func__, obj_priv->gtt_offset, obj->size);
2174 if (obj_priv->tiling_mode == I915_TILING_Y &&
2175 HAS_128_BYTE_Y_TILING(dev))
2180 /* Note: pitch better be a power of two tile widths */
2181 pitch_val = obj_priv->stride / tile_width;
2182 pitch_val = ffs(pitch_val) - 1;
2184 if (obj_priv->tiling_mode == I915_TILING_Y &&
2185 HAS_128_BYTE_Y_TILING(dev))
2186 WARN_ON(pitch_val > I830_FENCE_MAX_PITCH_VAL);
2188 WARN_ON(pitch_val > I915_FENCE_MAX_PITCH_VAL);
2190 val = obj_priv->gtt_offset;
2191 if (obj_priv->tiling_mode == I915_TILING_Y)
2192 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2193 val |= I915_FENCE_SIZE_BITS(obj->size);
2194 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2195 val |= I830_FENCE_REG_VALID;
2198 fence_reg = FENCE_REG_830_0 + (regnum * 4);
2200 fence_reg = FENCE_REG_945_8 + ((regnum - 8) * 4);
2201 I915_WRITE(fence_reg, val);
2204 static void i830_write_fence_reg(struct drm_i915_fence_reg *reg)
2206 struct drm_gem_object *obj = reg->obj;
2207 struct drm_device *dev = obj->dev;
2208 drm_i915_private_t *dev_priv = dev->dev_private;
2209 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2210 int regnum = obj_priv->fence_reg;
2213 uint32_t fence_size_bits;
2215 if ((obj_priv->gtt_offset & ~I830_FENCE_START_MASK) ||
2216 (obj_priv->gtt_offset & (obj->size - 1))) {
2217 WARN(1, "%s: object 0x%08x not 512K or size aligned\n",
2218 __func__, obj_priv->gtt_offset);
2222 pitch_val = obj_priv->stride / 128;
2223 pitch_val = ffs(pitch_val) - 1;
2224 WARN_ON(pitch_val > I830_FENCE_MAX_PITCH_VAL);
2226 val = obj_priv->gtt_offset;
2227 if (obj_priv->tiling_mode == I915_TILING_Y)
2228 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2229 fence_size_bits = I830_FENCE_SIZE_BITS(obj->size);
2230 WARN_ON(fence_size_bits & ~0x00000f00);
2231 val |= fence_size_bits;
2232 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2233 val |= I830_FENCE_REG_VALID;
2235 I915_WRITE(FENCE_REG_830_0 + (regnum * 4), val);
2238 static int i915_find_fence_reg(struct drm_device *dev)
2240 struct drm_i915_fence_reg *reg = NULL;
2241 struct drm_i915_gem_object *obj_priv = NULL;
2242 struct drm_i915_private *dev_priv = dev->dev_private;
2243 struct drm_gem_object *obj = NULL;
2246 /* First try to find a free reg */
2248 for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
2249 reg = &dev_priv->fence_regs[i];
2253 obj_priv = to_intel_bo(reg->obj);
2254 if (!obj_priv->pin_count)
2261 /* None available, try to steal one or wait for a user to finish */
2262 i = I915_FENCE_REG_NONE;
2263 list_for_each_entry(reg, &dev_priv->mm.fence_list,
2266 obj_priv = to_intel_bo(obj);
2268 if (obj_priv->pin_count)
2272 i = obj_priv->fence_reg;
2276 BUG_ON(i == I915_FENCE_REG_NONE);
2278 /* We only have a reference on obj from the active list. put_fence_reg
2279 * might drop that one, causing a use-after-free in it. So hold a
2280 * private reference to obj like the other callers of put_fence_reg
2281 * (set_tiling ioctl) do. */
2282 drm_gem_object_reference(obj);
2283 ret = i915_gem_object_put_fence_reg(obj);
2284 drm_gem_object_unreference(obj);
2292 * i915_gem_object_get_fence_reg - set up a fence reg for an object
2293 * @obj: object to map through a fence reg
2295 * When mapping objects through the GTT, userspace wants to be able to write
2296 * to them without having to worry about swizzling if the object is tiled.
2298 * This function walks the fence regs looking for a free one for @obj,
2299 * stealing one if it can't find any.
2301 * It then sets up the reg based on the object's properties: address, pitch
2302 * and tiling format.
2305 i915_gem_object_get_fence_reg(struct drm_gem_object *obj)
2307 struct drm_device *dev = obj->dev;
2308 struct drm_i915_private *dev_priv = dev->dev_private;
2309 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2310 struct drm_i915_fence_reg *reg = NULL;
2313 /* Just update our place in the LRU if our fence is getting used. */
2314 if (obj_priv->fence_reg != I915_FENCE_REG_NONE) {
2315 reg = &dev_priv->fence_regs[obj_priv->fence_reg];
2316 list_move_tail(®->lru_list, &dev_priv->mm.fence_list);
2320 switch (obj_priv->tiling_mode) {
2321 case I915_TILING_NONE:
2322 WARN(1, "allocating a fence for non-tiled object?\n");
2325 if (!obj_priv->stride)
2327 WARN((obj_priv->stride & (512 - 1)),
2328 "object 0x%08x is X tiled but has non-512B pitch\n",
2329 obj_priv->gtt_offset);
2332 if (!obj_priv->stride)
2334 WARN((obj_priv->stride & (128 - 1)),
2335 "object 0x%08x is Y tiled but has non-128B pitch\n",
2336 obj_priv->gtt_offset);
2340 ret = i915_find_fence_reg(dev);
2344 obj_priv->fence_reg = ret;
2345 reg = &dev_priv->fence_regs[obj_priv->fence_reg];
2346 list_add_tail(®->lru_list, &dev_priv->mm.fence_list);
2351 sandybridge_write_fence_reg(reg);
2352 else if (IS_I965G(dev))
2353 i965_write_fence_reg(reg);
2354 else if (IS_I9XX(dev))
2355 i915_write_fence_reg(reg);
2357 i830_write_fence_reg(reg);
2359 trace_i915_gem_object_get_fence(obj, obj_priv->fence_reg,
2360 obj_priv->tiling_mode);
2366 * i915_gem_clear_fence_reg - clear out fence register info
2367 * @obj: object to clear
2369 * Zeroes out the fence register itself and clears out the associated
2370 * data structures in dev_priv and obj_priv.
2373 i915_gem_clear_fence_reg(struct drm_gem_object *obj)
2375 struct drm_device *dev = obj->dev;
2376 drm_i915_private_t *dev_priv = dev->dev_private;
2377 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2378 struct drm_i915_fence_reg *reg =
2379 &dev_priv->fence_regs[obj_priv->fence_reg];
2382 I915_WRITE64(FENCE_REG_SANDYBRIDGE_0 +
2383 (obj_priv->fence_reg * 8), 0);
2384 } else if (IS_I965G(dev)) {
2385 I915_WRITE64(FENCE_REG_965_0 + (obj_priv->fence_reg * 8), 0);
2389 if (obj_priv->fence_reg < 8)
2390 fence_reg = FENCE_REG_830_0 + obj_priv->fence_reg * 4;
2392 fence_reg = FENCE_REG_945_8 + (obj_priv->fence_reg -
2395 I915_WRITE(fence_reg, 0);
2399 obj_priv->fence_reg = I915_FENCE_REG_NONE;
2400 list_del_init(®->lru_list);
2404 * i915_gem_object_put_fence_reg - waits on outstanding fenced access
2405 * to the buffer to finish, and then resets the fence register.
2406 * @obj: tiled object holding a fence register.
2408 * Zeroes out the fence register itself and clears out the associated
2409 * data structures in dev_priv and obj_priv.
2412 i915_gem_object_put_fence_reg(struct drm_gem_object *obj)
2414 struct drm_device *dev = obj->dev;
2415 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2417 if (obj_priv->fence_reg == I915_FENCE_REG_NONE)
2420 /* If we've changed tiling, GTT-mappings of the object
2421 * need to re-fault to ensure that the correct fence register
2422 * setup is in place.
2424 i915_gem_release_mmap(obj);
2426 /* On the i915, GPU access to tiled buffers is via a fence,
2427 * therefore we must wait for any outstanding access to complete
2428 * before clearing the fence.
2430 if (!IS_I965G(dev)) {
2433 ret = i915_gem_object_flush_gpu_write_domain(obj);
2437 ret = i915_gem_object_wait_rendering(obj);
2442 i915_gem_object_flush_gtt_write_domain(obj);
2443 i915_gem_clear_fence_reg (obj);
2449 * Finds free space in the GTT aperture and binds the object there.
2452 i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
2454 struct drm_device *dev = obj->dev;
2455 drm_i915_private_t *dev_priv = dev->dev_private;
2456 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2457 struct drm_mm_node *free_space;
2458 gfp_t gfpmask = __GFP_NORETRY | __GFP_NOWARN;
2461 if (obj_priv->madv != I915_MADV_WILLNEED) {
2462 DRM_ERROR("Attempting to bind a purgeable object\n");
2467 alignment = i915_gem_get_gtt_alignment(obj);
2468 if (alignment & (i915_gem_get_gtt_alignment(obj) - 1)) {
2469 DRM_ERROR("Invalid object alignment requested %u\n", alignment);
2473 /* If the object is bigger than the entire aperture, reject it early
2474 * before evicting everything in a vain attempt to find space.
2476 if (obj->size > dev->gtt_total) {
2477 DRM_ERROR("Attempting to bind an object larger than the aperture\n");
2482 free_space = drm_mm_search_free(&dev_priv->mm.gtt_space,
2483 obj->size, alignment, 0);
2484 if (free_space != NULL) {
2485 obj_priv->gtt_space = drm_mm_get_block(free_space, obj->size,
2487 if (obj_priv->gtt_space != NULL)
2488 obj_priv->gtt_offset = obj_priv->gtt_space->start;
2490 if (obj_priv->gtt_space == NULL) {
2491 /* If the gtt is empty and we're still having trouble
2492 * fitting our object in, we're out of memory.
2495 DRM_INFO("%s: GTT full, evicting something\n", __func__);
2497 ret = i915_gem_evict_something(dev, obj->size, alignment);
2505 DRM_INFO("Binding object of size %zd at 0x%08x\n",
2506 obj->size, obj_priv->gtt_offset);
2508 ret = i915_gem_object_get_pages(obj, gfpmask);
2510 drm_mm_put_block(obj_priv->gtt_space);
2511 obj_priv->gtt_space = NULL;
2513 if (ret == -ENOMEM) {
2514 /* first try to clear up some space from the GTT */
2515 ret = i915_gem_evict_something(dev, obj->size,
2518 /* now try to shrink everyone else */
2533 /* Create an AGP memory structure pointing at our pages, and bind it
2536 obj_priv->agp_mem = drm_agp_bind_pages(dev,
2538 obj->size >> PAGE_SHIFT,
2539 obj_priv->gtt_offset,
2540 obj_priv->agp_type);
2541 if (obj_priv->agp_mem == NULL) {
2542 i915_gem_object_put_pages(obj);
2543 drm_mm_put_block(obj_priv->gtt_space);
2544 obj_priv->gtt_space = NULL;
2546 ret = i915_gem_evict_something(dev, obj->size, alignment);
2552 atomic_inc(&dev->gtt_count);
2553 atomic_add(obj->size, &dev->gtt_memory);
2555 /* keep track of bounds object by adding it to the inactive list */
2556 list_add_tail(&obj_priv->list, &dev_priv->mm.inactive_list);
2558 /* Assert that the object is not currently in any GPU domain. As it
2559 * wasn't in the GTT, there shouldn't be any way it could have been in
2562 BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
2563 BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
2565 trace_i915_gem_object_bind(obj, obj_priv->gtt_offset);
2571 i915_gem_clflush_object(struct drm_gem_object *obj)
2573 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2575 /* If we don't have a page list set up, then we're not pinned
2576 * to GPU, and we can ignore the cache flush because it'll happen
2577 * again at bind time.
2579 if (obj_priv->pages == NULL)
2582 trace_i915_gem_object_clflush(obj);
2584 drm_clflush_pages(obj_priv->pages, obj->size / PAGE_SIZE);
2587 /** Flushes any GPU write domain for the object if it's dirty. */
2589 i915_gem_object_flush_gpu_write_domain(struct drm_gem_object *obj)
2591 struct drm_device *dev = obj->dev;
2592 uint32_t old_write_domain;
2593 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2595 if ((obj->write_domain & I915_GEM_GPU_DOMAINS) == 0)
2598 /* Queue the GPU write cache flushing we need. */
2599 old_write_domain = obj->write_domain;
2600 i915_gem_flush(dev, 0, obj->write_domain);
2601 if (i915_add_request(dev, NULL, obj->write_domain, obj_priv->ring) == 0)
2604 trace_i915_gem_object_change_domain(obj,
2610 /** Flushes the GTT write domain for the object if it's dirty. */
2612 i915_gem_object_flush_gtt_write_domain(struct drm_gem_object *obj)
2614 uint32_t old_write_domain;
2616 if (obj->write_domain != I915_GEM_DOMAIN_GTT)
2619 /* No actual flushing is required for the GTT write domain. Writes
2620 * to it immediately go to main memory as far as we know, so there's
2621 * no chipset flush. It also doesn't land in render cache.
2623 old_write_domain = obj->write_domain;
2624 obj->write_domain = 0;
2626 trace_i915_gem_object_change_domain(obj,
2631 /** Flushes the CPU write domain for the object if it's dirty. */
2633 i915_gem_object_flush_cpu_write_domain(struct drm_gem_object *obj)
2635 struct drm_device *dev = obj->dev;
2636 uint32_t old_write_domain;
2638 if (obj->write_domain != I915_GEM_DOMAIN_CPU)
2641 i915_gem_clflush_object(obj);
2642 drm_agp_chipset_flush(dev);
2643 old_write_domain = obj->write_domain;
2644 obj->write_domain = 0;
2646 trace_i915_gem_object_change_domain(obj,
2652 i915_gem_object_flush_write_domain(struct drm_gem_object *obj)
2656 switch (obj->write_domain) {
2657 case I915_GEM_DOMAIN_GTT:
2658 i915_gem_object_flush_gtt_write_domain(obj);
2660 case I915_GEM_DOMAIN_CPU:
2661 i915_gem_object_flush_cpu_write_domain(obj);
2664 ret = i915_gem_object_flush_gpu_write_domain(obj);
2672 * Moves a single object to the GTT read, and possibly write domain.
2674 * This function returns when the move is complete, including waiting on
2678 i915_gem_object_set_to_gtt_domain(struct drm_gem_object *obj, int write)
2680 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2681 uint32_t old_write_domain, old_read_domains;
2684 /* Not valid to be called on unbound objects. */
2685 if (obj_priv->gtt_space == NULL)
2688 ret = i915_gem_object_flush_gpu_write_domain(obj);
2692 /* Wait on any GPU rendering and flushing to occur. */
2693 ret = i915_gem_object_wait_rendering(obj);
2697 old_write_domain = obj->write_domain;
2698 old_read_domains = obj->read_domains;
2700 /* If we're writing through the GTT domain, then CPU and GPU caches
2701 * will need to be invalidated at next use.
2704 obj->read_domains &= I915_GEM_DOMAIN_GTT;
2706 i915_gem_object_flush_cpu_write_domain(obj);
2708 /* It should now be out of any other write domains, and we can update
2709 * the domain values for our changes.
2711 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
2712 obj->read_domains |= I915_GEM_DOMAIN_GTT;
2714 obj->write_domain = I915_GEM_DOMAIN_GTT;
2715 obj_priv->dirty = 1;
2718 trace_i915_gem_object_change_domain(obj,
2726 * Prepare buffer for display plane. Use uninterruptible for possible flush
2727 * wait, as in modesetting process we're not supposed to be interrupted.
2730 i915_gem_object_set_to_display_plane(struct drm_gem_object *obj)
2732 struct drm_device *dev = obj->dev;
2733 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2734 uint32_t old_write_domain, old_read_domains;
2737 /* Not valid to be called on unbound objects. */
2738 if (obj_priv->gtt_space == NULL)
2741 ret = i915_gem_object_flush_gpu_write_domain(obj);
2745 /* Wait on any GPU rendering and flushing to occur. */
2746 if (obj_priv->active) {
2748 DRM_INFO("%s: object %p wait for seqno %08x\n",
2749 __func__, obj, obj_priv->last_rendering_seqno);
2751 ret = i915_do_wait_request(dev,
2752 obj_priv->last_rendering_seqno,
2759 i915_gem_object_flush_cpu_write_domain(obj);
2761 old_write_domain = obj->write_domain;
2762 old_read_domains = obj->read_domains;
2764 /* It should now be out of any other write domains, and we can update
2765 * the domain values for our changes.
2767 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
2768 obj->read_domains = I915_GEM_DOMAIN_GTT;
2769 obj->write_domain = I915_GEM_DOMAIN_GTT;
2770 obj_priv->dirty = 1;
2772 trace_i915_gem_object_change_domain(obj,
2780 * Moves a single object to the CPU read, and possibly write domain.
2782 * This function returns when the move is complete, including waiting on
2786 i915_gem_object_set_to_cpu_domain(struct drm_gem_object *obj, int write)
2788 uint32_t old_write_domain, old_read_domains;
2791 ret = i915_gem_object_flush_gpu_write_domain(obj);
2795 /* Wait on any GPU rendering and flushing to occur. */
2796 ret = i915_gem_object_wait_rendering(obj);
2800 i915_gem_object_flush_gtt_write_domain(obj);
2802 /* If we have a partially-valid cache of the object in the CPU,
2803 * finish invalidating it and free the per-page flags.
2805 i915_gem_object_set_to_full_cpu_read_domain(obj);
2807 old_write_domain = obj->write_domain;
2808 old_read_domains = obj->read_domains;
2810 /* Flush the CPU cache if it's still invalid. */
2811 if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0) {
2812 i915_gem_clflush_object(obj);
2814 obj->read_domains |= I915_GEM_DOMAIN_CPU;
2817 /* It should now be out of any other write domains, and we can update
2818 * the domain values for our changes.
2820 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
2822 /* If we're writing through the CPU, then the GPU read domains will
2823 * need to be invalidated at next use.
2826 obj->read_domains &= I915_GEM_DOMAIN_CPU;
2827 obj->write_domain = I915_GEM_DOMAIN_CPU;
2830 trace_i915_gem_object_change_domain(obj,
2838 * Set the next domain for the specified object. This
2839 * may not actually perform the necessary flushing/invaliding though,
2840 * as that may want to be batched with other set_domain operations
2842 * This is (we hope) the only really tricky part of gem. The goal
2843 * is fairly simple -- track which caches hold bits of the object
2844 * and make sure they remain coherent. A few concrete examples may
2845 * help to explain how it works. For shorthand, we use the notation
2846 * (read_domains, write_domain), e.g. (CPU, CPU) to indicate the
2847 * a pair of read and write domain masks.
2849 * Case 1: the batch buffer
2855 * 5. Unmapped from GTT
2858 * Let's take these a step at a time
2861 * Pages allocated from the kernel may still have
2862 * cache contents, so we set them to (CPU, CPU) always.
2863 * 2. Written by CPU (using pwrite)
2864 * The pwrite function calls set_domain (CPU, CPU) and
2865 * this function does nothing (as nothing changes)
2867 * This function asserts that the object is not
2868 * currently in any GPU-based read or write domains
2870 * i915_gem_execbuffer calls set_domain (COMMAND, 0).
2871 * As write_domain is zero, this function adds in the
2872 * current read domains (CPU+COMMAND, 0).
2873 * flush_domains is set to CPU.
2874 * invalidate_domains is set to COMMAND
2875 * clflush is run to get data out of the CPU caches
2876 * then i915_dev_set_domain calls i915_gem_flush to
2877 * emit an MI_FLUSH and drm_agp_chipset_flush
2878 * 5. Unmapped from GTT
2879 * i915_gem_object_unbind calls set_domain (CPU, CPU)
2880 * flush_domains and invalidate_domains end up both zero
2881 * so no flushing/invalidating happens
2885 * Case 2: The shared render buffer
2889 * 3. Read/written by GPU
2890 * 4. set_domain to (CPU,CPU)
2891 * 5. Read/written by CPU
2892 * 6. Read/written by GPU
2895 * Same as last example, (CPU, CPU)
2897 * Nothing changes (assertions find that it is not in the GPU)
2898 * 3. Read/written by GPU
2899 * execbuffer calls set_domain (RENDER, RENDER)
2900 * flush_domains gets CPU
2901 * invalidate_domains gets GPU
2903 * MI_FLUSH and drm_agp_chipset_flush
2904 * 4. set_domain (CPU, CPU)
2905 * flush_domains gets GPU
2906 * invalidate_domains gets CPU
2907 * wait_rendering (obj) to make sure all drawing is complete.
2908 * This will include an MI_FLUSH to get the data from GPU
2910 * clflush (obj) to invalidate the CPU cache
2911 * Another MI_FLUSH in i915_gem_flush (eliminate this somehow?)
2912 * 5. Read/written by CPU
2913 * cache lines are loaded and dirtied
2914 * 6. Read written by GPU
2915 * Same as last GPU access
2917 * Case 3: The constant buffer
2922 * 4. Updated (written) by CPU again
2931 * flush_domains = CPU
2932 * invalidate_domains = RENDER
2935 * drm_agp_chipset_flush
2936 * 4. Updated (written) by CPU again
2938 * flush_domains = 0 (no previous write domain)
2939 * invalidate_domains = 0 (no new read domains)
2942 * flush_domains = CPU
2943 * invalidate_domains = RENDER
2946 * drm_agp_chipset_flush
2949 i915_gem_object_set_to_gpu_domain(struct drm_gem_object *obj)
2951 struct drm_device *dev = obj->dev;
2952 drm_i915_private_t *dev_priv = dev->dev_private;
2953 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
2954 uint32_t invalidate_domains = 0;
2955 uint32_t flush_domains = 0;
2956 uint32_t old_read_domains;
2958 BUG_ON(obj->pending_read_domains & I915_GEM_DOMAIN_CPU);
2959 BUG_ON(obj->pending_write_domain == I915_GEM_DOMAIN_CPU);
2961 intel_mark_busy(dev, obj);
2964 DRM_INFO("%s: object %p read %08x -> %08x write %08x -> %08x\n",
2966 obj->read_domains, obj->pending_read_domains,
2967 obj->write_domain, obj->pending_write_domain);
2970 * If the object isn't moving to a new write domain,
2971 * let the object stay in multiple read domains
2973 if (obj->pending_write_domain == 0)
2974 obj->pending_read_domains |= obj->read_domains;
2976 obj_priv->dirty = 1;
2979 * Flush the current write domain if
2980 * the new read domains don't match. Invalidate
2981 * any read domains which differ from the old
2984 if (obj->write_domain &&
2985 obj->write_domain != obj->pending_read_domains) {
2986 flush_domains |= obj->write_domain;
2987 invalidate_domains |=
2988 obj->pending_read_domains & ~obj->write_domain;
2991 * Invalidate any read caches which may have
2992 * stale data. That is, any new read domains.
2994 invalidate_domains |= obj->pending_read_domains & ~obj->read_domains;
2995 if ((flush_domains | invalidate_domains) & I915_GEM_DOMAIN_CPU) {
2997 DRM_INFO("%s: CPU domain flush %08x invalidate %08x\n",
2998 __func__, flush_domains, invalidate_domains);
3000 i915_gem_clflush_object(obj);
3003 old_read_domains = obj->read_domains;
3005 /* The actual obj->write_domain will be updated with
3006 * pending_write_domain after we emit the accumulated flush for all
3007 * of our domain changes in execbuffers (which clears objects'
3008 * write_domains). So if we have a current write domain that we
3009 * aren't changing, set pending_write_domain to that.
3011 if (flush_domains == 0 && obj->pending_write_domain == 0)
3012 obj->pending_write_domain = obj->write_domain;
3013 obj->read_domains = obj->pending_read_domains;
3015 if (flush_domains & I915_GEM_GPU_DOMAINS) {
3016 if (obj_priv->ring == &dev_priv->render_ring)
3017 dev_priv->flush_rings |= FLUSH_RENDER_RING;
3018 else if (obj_priv->ring == &dev_priv->bsd_ring)
3019 dev_priv->flush_rings |= FLUSH_BSD_RING;
3022 dev->invalidate_domains |= invalidate_domains;
3023 dev->flush_domains |= flush_domains;
3025 DRM_INFO("%s: read %08x write %08x invalidate %08x flush %08x\n",
3027 obj->read_domains, obj->write_domain,
3028 dev->invalidate_domains, dev->flush_domains);
3031 trace_i915_gem_object_change_domain(obj,
3037 * Moves the object from a partially CPU read to a full one.
3039 * Note that this only resolves i915_gem_object_set_cpu_read_domain_range(),
3040 * and doesn't handle transitioning from !(read_domains & I915_GEM_DOMAIN_CPU).
3043 i915_gem_object_set_to_full_cpu_read_domain(struct drm_gem_object *obj)
3045 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3047 if (!obj_priv->page_cpu_valid)
3050 /* If we're partially in the CPU read domain, finish moving it in.
3052 if (obj->read_domains & I915_GEM_DOMAIN_CPU) {
3055 for (i = 0; i <= (obj->size - 1) / PAGE_SIZE; i++) {
3056 if (obj_priv->page_cpu_valid[i])
3058 drm_clflush_pages(obj_priv->pages + i, 1);
3062 /* Free the page_cpu_valid mappings which are now stale, whether
3063 * or not we've got I915_GEM_DOMAIN_CPU.
3065 kfree(obj_priv->page_cpu_valid);
3066 obj_priv->page_cpu_valid = NULL;
3070 * Set the CPU read domain on a range of the object.
3072 * The object ends up with I915_GEM_DOMAIN_CPU in its read flags although it's
3073 * not entirely valid. The page_cpu_valid member of the object flags which
3074 * pages have been flushed, and will be respected by
3075 * i915_gem_object_set_to_cpu_domain() if it's called on to get a valid mapping
3076 * of the whole object.
3078 * This function returns when the move is complete, including waiting on
3082 i915_gem_object_set_cpu_read_domain_range(struct drm_gem_object *obj,
3083 uint64_t offset, uint64_t size)
3085 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3086 uint32_t old_read_domains;
3089 if (offset == 0 && size == obj->size)
3090 return i915_gem_object_set_to_cpu_domain(obj, 0);
3092 ret = i915_gem_object_flush_gpu_write_domain(obj);
3096 /* Wait on any GPU rendering and flushing to occur. */
3097 ret = i915_gem_object_wait_rendering(obj);
3100 i915_gem_object_flush_gtt_write_domain(obj);
3102 /* If we're already fully in the CPU read domain, we're done. */
3103 if (obj_priv->page_cpu_valid == NULL &&
3104 (obj->read_domains & I915_GEM_DOMAIN_CPU) != 0)
3107 /* Otherwise, create/clear the per-page CPU read domain flag if we're
3108 * newly adding I915_GEM_DOMAIN_CPU
3110 if (obj_priv->page_cpu_valid == NULL) {
3111 obj_priv->page_cpu_valid = kzalloc(obj->size / PAGE_SIZE,
3113 if (obj_priv->page_cpu_valid == NULL)
3115 } else if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0)
3116 memset(obj_priv->page_cpu_valid, 0, obj->size / PAGE_SIZE);
3118 /* Flush the cache on any pages that are still invalid from the CPU's
3121 for (i = offset / PAGE_SIZE; i <= (offset + size - 1) / PAGE_SIZE;
3123 if (obj_priv->page_cpu_valid[i])
3126 drm_clflush_pages(obj_priv->pages + i, 1);
3128 obj_priv->page_cpu_valid[i] = 1;
3131 /* It should now be out of any other write domains, and we can update
3132 * the domain values for our changes.
3134 BUG_ON((obj->write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
3136 old_read_domains = obj->read_domains;
3137 obj->read_domains |= I915_GEM_DOMAIN_CPU;
3139 trace_i915_gem_object_change_domain(obj,
3147 * Pin an object to the GTT and evaluate the relocations landing in it.
3150 i915_gem_object_pin_and_relocate(struct drm_gem_object *obj,
3151 struct drm_file *file_priv,
3152 struct drm_i915_gem_exec_object2 *entry,
3153 struct drm_i915_gem_relocation_entry *relocs)
3155 struct drm_device *dev = obj->dev;
3156 drm_i915_private_t *dev_priv = dev->dev_private;
3157 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3159 void __iomem *reloc_page;
3162 need_fence = entry->flags & EXEC_OBJECT_NEEDS_FENCE &&
3163 obj_priv->tiling_mode != I915_TILING_NONE;
3165 /* Check fence reg constraints and rebind if necessary */
3167 !i915_gem_object_fence_offset_ok(obj,
3168 obj_priv->tiling_mode)) {
3169 ret = i915_gem_object_unbind(obj);
3174 /* Choose the GTT offset for our buffer and put it there. */
3175 ret = i915_gem_object_pin(obj, (uint32_t) entry->alignment);
3180 * Pre-965 chips need a fence register set up in order to
3181 * properly handle blits to/from tiled surfaces.
3184 ret = i915_gem_object_get_fence_reg(obj);
3186 i915_gem_object_unpin(obj);
3191 entry->offset = obj_priv->gtt_offset;
3193 /* Apply the relocations, using the GTT aperture to avoid cache
3194 * flushing requirements.
3196 for (i = 0; i < entry->relocation_count; i++) {
3197 struct drm_i915_gem_relocation_entry *reloc= &relocs[i];
3198 struct drm_gem_object *target_obj;
3199 struct drm_i915_gem_object *target_obj_priv;
3200 uint32_t reloc_val, reloc_offset;
3201 uint32_t __iomem *reloc_entry;
3203 target_obj = drm_gem_object_lookup(obj->dev, file_priv,
3204 reloc->target_handle);
3205 if (target_obj == NULL) {
3206 i915_gem_object_unpin(obj);
3209 target_obj_priv = to_intel_bo(target_obj);
3212 DRM_INFO("%s: obj %p offset %08x target %d "
3213 "read %08x write %08x gtt %08x "
3214 "presumed %08x delta %08x\n",
3217 (int) reloc->offset,
3218 (int) reloc->target_handle,
3219 (int) reloc->read_domains,
3220 (int) reloc->write_domain,
3221 (int) target_obj_priv->gtt_offset,
3222 (int) reloc->presumed_offset,
3226 /* The target buffer should have appeared before us in the
3227 * exec_object list, so it should have a GTT space bound by now.
3229 if (target_obj_priv->gtt_space == NULL) {
3230 DRM_ERROR("No GTT space found for object %d\n",
3231 reloc->target_handle);
3232 drm_gem_object_unreference(target_obj);
3233 i915_gem_object_unpin(obj);
3237 /* Validate that the target is in a valid r/w GPU domain */
3238 if (reloc->write_domain & (reloc->write_domain - 1)) {
3239 DRM_ERROR("reloc with multiple write domains: "
3240 "obj %p target %d offset %d "
3241 "read %08x write %08x",
3242 obj, reloc->target_handle,
3243 (int) reloc->offset,
3244 reloc->read_domains,
3245 reloc->write_domain);
3248 if (reloc->write_domain & I915_GEM_DOMAIN_CPU ||
3249 reloc->read_domains & I915_GEM_DOMAIN_CPU) {
3250 DRM_ERROR("reloc with read/write CPU domains: "
3251 "obj %p target %d offset %d "
3252 "read %08x write %08x",
3253 obj, reloc->target_handle,
3254 (int) reloc->offset,
3255 reloc->read_domains,
3256 reloc->write_domain);
3257 drm_gem_object_unreference(target_obj);
3258 i915_gem_object_unpin(obj);
3261 if (reloc->write_domain && target_obj->pending_write_domain &&
3262 reloc->write_domain != target_obj->pending_write_domain) {
3263 DRM_ERROR("Write domain conflict: "
3264 "obj %p target %d offset %d "
3265 "new %08x old %08x\n",
3266 obj, reloc->target_handle,
3267 (int) reloc->offset,
3268 reloc->write_domain,
3269 target_obj->pending_write_domain);
3270 drm_gem_object_unreference(target_obj);
3271 i915_gem_object_unpin(obj);
3275 target_obj->pending_read_domains |= reloc->read_domains;
3276 target_obj->pending_write_domain |= reloc->write_domain;
3278 /* If the relocation already has the right value in it, no
3279 * more work needs to be done.
3281 if (target_obj_priv->gtt_offset == reloc->presumed_offset) {
3282 drm_gem_object_unreference(target_obj);
3286 /* Check that the relocation address is valid... */
3287 if (reloc->offset > obj->size - 4) {
3288 DRM_ERROR("Relocation beyond object bounds: "
3289 "obj %p target %d offset %d size %d.\n",
3290 obj, reloc->target_handle,
3291 (int) reloc->offset, (int) obj->size);
3292 drm_gem_object_unreference(target_obj);
3293 i915_gem_object_unpin(obj);
3296 if (reloc->offset & 3) {
3297 DRM_ERROR("Relocation not 4-byte aligned: "
3298 "obj %p target %d offset %d.\n",
3299 obj, reloc->target_handle,
3300 (int) reloc->offset);
3301 drm_gem_object_unreference(target_obj);
3302 i915_gem_object_unpin(obj);
3306 /* and points to somewhere within the target object. */
3307 if (reloc->delta >= target_obj->size) {
3308 DRM_ERROR("Relocation beyond target object bounds: "
3309 "obj %p target %d delta %d size %d.\n",
3310 obj, reloc->target_handle,
3311 (int) reloc->delta, (int) target_obj->size);
3312 drm_gem_object_unreference(target_obj);
3313 i915_gem_object_unpin(obj);
3317 ret = i915_gem_object_set_to_gtt_domain(obj, 1);
3319 drm_gem_object_unreference(target_obj);
3320 i915_gem_object_unpin(obj);
3324 /* Map the page containing the relocation we're going to
3327 reloc_offset = obj_priv->gtt_offset + reloc->offset;
3328 reloc_page = io_mapping_map_atomic_wc(dev_priv->mm.gtt_mapping,
3332 reloc_entry = (uint32_t __iomem *)(reloc_page +
3333 (reloc_offset & (PAGE_SIZE - 1)));
3334 reloc_val = target_obj_priv->gtt_offset + reloc->delta;
3337 DRM_INFO("Applied relocation: %p@0x%08x %08x -> %08x\n",
3338 obj, (unsigned int) reloc->offset,
3339 readl(reloc_entry), reloc_val);
3341 writel(reloc_val, reloc_entry);
3342 io_mapping_unmap_atomic(reloc_page, KM_USER0);
3344 /* The updated presumed offset for this entry will be
3345 * copied back out to the user.
3347 reloc->presumed_offset = target_obj_priv->gtt_offset;
3349 drm_gem_object_unreference(target_obj);
3354 i915_gem_dump_object(obj, 128, __func__, ~0);
3359 /* Throttle our rendering by waiting until the ring has completed our requests
3360 * emitted over 20 msec ago.
3362 * Note that if we were to use the current jiffies each time around the loop,
3363 * we wouldn't escape the function with any frames outstanding if the time to
3364 * render a frame was over 20ms.
3366 * This should get us reasonable parallelism between CPU and GPU but also
3367 * relatively low latency when blocking on a particular request to finish.
3370 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file_priv)
3372 struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
3374 unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
3376 mutex_lock(&dev->struct_mutex);
3377 while (!list_empty(&i915_file_priv->mm.request_list)) {
3378 struct drm_i915_gem_request *request;
3380 request = list_first_entry(&i915_file_priv->mm.request_list,
3381 struct drm_i915_gem_request,
3384 if (time_after_eq(request->emitted_jiffies, recent_enough))
3387 ret = i915_wait_request(dev, request->seqno, request->ring);
3391 mutex_unlock(&dev->struct_mutex);
3397 i915_gem_get_relocs_from_user(struct drm_i915_gem_exec_object2 *exec_list,
3398 uint32_t buffer_count,
3399 struct drm_i915_gem_relocation_entry **relocs)
3401 uint32_t reloc_count = 0, reloc_index = 0, i;
3405 for (i = 0; i < buffer_count; i++) {
3406 if (reloc_count + exec_list[i].relocation_count < reloc_count)
3408 reloc_count += exec_list[i].relocation_count;
3411 *relocs = drm_calloc_large(reloc_count, sizeof(**relocs));
3412 if (*relocs == NULL) {
3413 DRM_ERROR("failed to alloc relocs, count %d\n", reloc_count);
3417 for (i = 0; i < buffer_count; i++) {
3418 struct drm_i915_gem_relocation_entry __user *user_relocs;
3420 user_relocs = (void __user *)(uintptr_t)exec_list[i].relocs_ptr;
3422 ret = copy_from_user(&(*relocs)[reloc_index],
3424 exec_list[i].relocation_count *
3427 drm_free_large(*relocs);
3432 reloc_index += exec_list[i].relocation_count;
3439 i915_gem_put_relocs_to_user(struct drm_i915_gem_exec_object2 *exec_list,
3440 uint32_t buffer_count,
3441 struct drm_i915_gem_relocation_entry *relocs)
3443 uint32_t reloc_count = 0, i;
3449 for (i = 0; i < buffer_count; i++) {
3450 struct drm_i915_gem_relocation_entry __user *user_relocs;
3453 user_relocs = (void __user *)(uintptr_t)exec_list[i].relocs_ptr;
3455 unwritten = copy_to_user(user_relocs,
3456 &relocs[reloc_count],
3457 exec_list[i].relocation_count *
3465 reloc_count += exec_list[i].relocation_count;
3469 drm_free_large(relocs);
3475 i915_gem_check_execbuffer (struct drm_i915_gem_execbuffer2 *exec,
3476 uint64_t exec_offset)
3478 uint32_t exec_start, exec_len;
3480 exec_start = (uint32_t) exec_offset + exec->batch_start_offset;
3481 exec_len = (uint32_t) exec->batch_len;
3483 if ((exec_start | exec_len) & 0x7)
3493 i915_gem_wait_for_pending_flip(struct drm_device *dev,
3494 struct drm_gem_object **object_list,
3497 drm_i915_private_t *dev_priv = dev->dev_private;
3498 struct drm_i915_gem_object *obj_priv;
3503 prepare_to_wait(&dev_priv->pending_flip_queue,
3504 &wait, TASK_INTERRUPTIBLE);
3505 for (i = 0; i < count; i++) {
3506 obj_priv = to_intel_bo(object_list[i]);
3507 if (atomic_read(&obj_priv->pending_flip) > 0)
3513 if (!signal_pending(current)) {
3514 mutex_unlock(&dev->struct_mutex);
3516 mutex_lock(&dev->struct_mutex);
3522 finish_wait(&dev_priv->pending_flip_queue, &wait);
3529 i915_gem_do_execbuffer(struct drm_device *dev, void *data,
3530 struct drm_file *file_priv,
3531 struct drm_i915_gem_execbuffer2 *args,
3532 struct drm_i915_gem_exec_object2 *exec_list)
3534 drm_i915_private_t *dev_priv = dev->dev_private;
3535 struct drm_gem_object **object_list = NULL;
3536 struct drm_gem_object *batch_obj;
3537 struct drm_i915_gem_object *obj_priv;
3538 struct drm_clip_rect *cliprects = NULL;
3539 struct drm_i915_gem_relocation_entry *relocs = NULL;
3540 int ret = 0, ret2, i, pinned = 0;
3541 uint64_t exec_offset;
3542 uint32_t seqno, flush_domains, reloc_index;
3543 int pin_tries, flips;
3545 struct intel_ring_buffer *ring = NULL;
3548 DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
3549 (int) args->buffers_ptr, args->buffer_count, args->batch_len);
3551 if (args->flags & I915_EXEC_BSD) {
3552 if (!HAS_BSD(dev)) {
3553 DRM_ERROR("execbuf with wrong flag\n");
3556 ring = &dev_priv->bsd_ring;
3558 ring = &dev_priv->render_ring;
3561 if (args->buffer_count < 1) {
3562 DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
3565 object_list = drm_malloc_ab(sizeof(*object_list), args->buffer_count);
3566 if (object_list == NULL) {
3567 DRM_ERROR("Failed to allocate object list for %d buffers\n",
3568 args->buffer_count);
3573 if (args->num_cliprects != 0) {
3574 cliprects = kcalloc(args->num_cliprects, sizeof(*cliprects),
3576 if (cliprects == NULL) {
3581 ret = copy_from_user(cliprects,
3582 (struct drm_clip_rect __user *)
3583 (uintptr_t) args->cliprects_ptr,
3584 sizeof(*cliprects) * args->num_cliprects);
3586 DRM_ERROR("copy %d cliprects failed: %d\n",
3587 args->num_cliprects, ret);
3592 ret = i915_gem_get_relocs_from_user(exec_list, args->buffer_count,
3597 mutex_lock(&dev->struct_mutex);
3599 i915_verify_inactive(dev, __FILE__, __LINE__);
3601 if (atomic_read(&dev_priv->mm.wedged)) {
3602 mutex_unlock(&dev->struct_mutex);
3607 if (dev_priv->mm.suspended) {
3608 mutex_unlock(&dev->struct_mutex);
3613 /* Look up object handles */
3615 for (i = 0; i < args->buffer_count; i++) {
3616 object_list[i] = drm_gem_object_lookup(dev, file_priv,
3617 exec_list[i].handle);
3618 if (object_list[i] == NULL) {
3619 DRM_ERROR("Invalid object handle %d at index %d\n",
3620 exec_list[i].handle, i);
3621 /* prevent error path from reading uninitialized data */
3622 args->buffer_count = i + 1;
3627 obj_priv = to_intel_bo(object_list[i]);
3628 if (obj_priv->in_execbuffer) {
3629 DRM_ERROR("Object %p appears more than once in object list\n",
3631 /* prevent error path from reading uninitialized data */
3632 args->buffer_count = i + 1;
3636 obj_priv->in_execbuffer = true;
3637 flips += atomic_read(&obj_priv->pending_flip);
3641 ret = i915_gem_wait_for_pending_flip(dev, object_list,
3642 args->buffer_count);
3647 /* Pin and relocate */
3648 for (pin_tries = 0; ; pin_tries++) {
3652 for (i = 0; i < args->buffer_count; i++) {
3653 object_list[i]->pending_read_domains = 0;
3654 object_list[i]->pending_write_domain = 0;
3655 ret = i915_gem_object_pin_and_relocate(object_list[i],
3658 &relocs[reloc_index]);
3662 reloc_index += exec_list[i].relocation_count;
3668 /* error other than GTT full, or we've already tried again */
3669 if (ret != -ENOSPC || pin_tries >= 1) {
3670 if (ret != -ERESTARTSYS) {
3671 unsigned long long total_size = 0;
3673 for (i = 0; i < args->buffer_count; i++) {
3674 obj_priv = to_intel_bo(object_list[i]);
3676 total_size += object_list[i]->size;
3678 exec_list[i].flags & EXEC_OBJECT_NEEDS_FENCE &&
3679 obj_priv->tiling_mode != I915_TILING_NONE;
3681 DRM_ERROR("Failed to pin buffer %d of %d, total %llu bytes, %d fences: %d\n",
3682 pinned+1, args->buffer_count,
3683 total_size, num_fences,
3685 DRM_ERROR("%d objects [%d pinned], "
3686 "%d object bytes [%d pinned], "
3687 "%d/%d gtt bytes\n",
3688 atomic_read(&dev->object_count),
3689 atomic_read(&dev->pin_count),
3690 atomic_read(&dev->object_memory),
3691 atomic_read(&dev->pin_memory),
3692 atomic_read(&dev->gtt_memory),
3698 /* unpin all of our buffers */
3699 for (i = 0; i < pinned; i++)
3700 i915_gem_object_unpin(object_list[i]);
3703 /* evict everyone we can from the aperture */
3704 ret = i915_gem_evict_everything(dev);
3705 if (ret && ret != -ENOSPC)
3709 /* Set the pending read domains for the batch buffer to COMMAND */
3710 batch_obj = object_list[args->buffer_count-1];
3711 if (batch_obj->pending_write_domain) {
3712 DRM_ERROR("Attempting to use self-modifying batch buffer\n");
3716 batch_obj->pending_read_domains |= I915_GEM_DOMAIN_COMMAND;
3718 /* Sanity check the batch buffer, prior to moving objects */
3719 exec_offset = exec_list[args->buffer_count - 1].offset;
3720 ret = i915_gem_check_execbuffer (args, exec_offset);
3722 DRM_ERROR("execbuf with invalid offset/length\n");
3726 i915_verify_inactive(dev, __FILE__, __LINE__);
3728 /* Zero the global flush/invalidate flags. These
3729 * will be modified as new domains are computed
3732 dev->invalidate_domains = 0;
3733 dev->flush_domains = 0;
3734 dev_priv->flush_rings = 0;
3736 for (i = 0; i < args->buffer_count; i++) {
3737 struct drm_gem_object *obj = object_list[i];
3739 /* Compute new gpu domains and update invalidate/flush */
3740 i915_gem_object_set_to_gpu_domain(obj);
3743 i915_verify_inactive(dev, __FILE__, __LINE__);
3745 if (dev->invalidate_domains | dev->flush_domains) {
3747 DRM_INFO("%s: invalidate_domains %08x flush_domains %08x\n",
3749 dev->invalidate_domains,
3750 dev->flush_domains);
3753 dev->invalidate_domains,
3754 dev->flush_domains);
3755 if (dev_priv->flush_rings & FLUSH_RENDER_RING)
3756 (void)i915_add_request(dev, file_priv,
3758 &dev_priv->render_ring);
3759 if (dev_priv->flush_rings & FLUSH_BSD_RING)
3760 (void)i915_add_request(dev, file_priv,
3762 &dev_priv->bsd_ring);
3765 for (i = 0; i < args->buffer_count; i++) {
3766 struct drm_gem_object *obj = object_list[i];
3767 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
3768 uint32_t old_write_domain = obj->write_domain;
3770 obj->write_domain = obj->pending_write_domain;
3771 if (obj->write_domain)
3772 list_move_tail(&obj_priv->gpu_write_list,
3773 &dev_priv->mm.gpu_write_list);
3775 list_del_init(&obj_priv->gpu_write_list);
3777 trace_i915_gem_object_change_domain(obj,
3782 i915_verify_inactive(dev, __FILE__, __LINE__);
3785 for (i = 0; i < args->buffer_count; i++) {
3786 i915_gem_object_check_coherency(object_list[i],
3787 exec_list[i].handle);
3792 i915_gem_dump_object(batch_obj,
3798 /* Exec the batchbuffer */
3799 ret = ring->dispatch_gem_execbuffer(dev, ring, args,
3800 cliprects, exec_offset);
3802 DRM_ERROR("dispatch failed %d\n", ret);
3807 * Ensure that the commands in the batch buffer are
3808 * finished before the interrupt fires
3810 flush_domains = i915_retire_commands(dev, ring);
3812 i915_verify_inactive(dev, __FILE__, __LINE__);
3815 * Get a seqno representing the execution of the current buffer,
3816 * which we can wait on. We would like to mitigate these interrupts,
3817 * likely by only creating seqnos occasionally (so that we have
3818 * *some* interrupts representing completion of buffers that we can
3819 * wait on when trying to clear up gtt space).
3821 seqno = i915_add_request(dev, file_priv, flush_domains, ring);
3823 for (i = 0; i < args->buffer_count; i++) {
3824 struct drm_gem_object *obj = object_list[i];
3825 obj_priv = to_intel_bo(obj);
3827 i915_gem_object_move_to_active(obj, seqno, ring);
3829 DRM_INFO("%s: move to exec list %p\n", __func__, obj);
3833 i915_dump_lru(dev, __func__);
3836 i915_verify_inactive(dev, __FILE__, __LINE__);
3839 for (i = 0; i < pinned; i++)
3840 i915_gem_object_unpin(object_list[i]);
3842 for (i = 0; i < args->buffer_count; i++) {
3843 if (object_list[i]) {
3844 obj_priv = to_intel_bo(object_list[i]);
3845 obj_priv->in_execbuffer = false;
3847 drm_gem_object_unreference(object_list[i]);
3850 mutex_unlock(&dev->struct_mutex);
3853 /* Copy the updated relocations out regardless of current error
3854 * state. Failure to update the relocs would mean that the next
3855 * time userland calls execbuf, it would do so with presumed offset
3856 * state that didn't match the actual object state.
3858 ret2 = i915_gem_put_relocs_to_user(exec_list, args->buffer_count,
3861 DRM_ERROR("Failed to copy relocations back out: %d\n", ret2);
3867 drm_free_large(object_list);
3874 * Legacy execbuffer just creates an exec2 list from the original exec object
3875 * list array and passes it to the real function.
3878 i915_gem_execbuffer(struct drm_device *dev, void *data,
3879 struct drm_file *file_priv)
3881 struct drm_i915_gem_execbuffer *args = data;
3882 struct drm_i915_gem_execbuffer2 exec2;
3883 struct drm_i915_gem_exec_object *exec_list = NULL;
3884 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
3888 DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
3889 (int) args->buffers_ptr, args->buffer_count, args->batch_len);
3892 if (args->buffer_count < 1) {
3893 DRM_ERROR("execbuf with %d buffers\n", args->buffer_count);
3897 /* Copy in the exec list from userland */
3898 exec_list = drm_malloc_ab(sizeof(*exec_list), args->buffer_count);
3899 exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
3900 if (exec_list == NULL || exec2_list == NULL) {
3901 DRM_ERROR("Failed to allocate exec list for %d buffers\n",
3902 args->buffer_count);
3903 drm_free_large(exec_list);
3904 drm_free_large(exec2_list);
3907 ret = copy_from_user(exec_list,
3908 (struct drm_i915_relocation_entry __user *)
3909 (uintptr_t) args->buffers_ptr,
3910 sizeof(*exec_list) * args->buffer_count);
3912 DRM_ERROR("copy %d exec entries failed %d\n",
3913 args->buffer_count, ret);
3914 drm_free_large(exec_list);
3915 drm_free_large(exec2_list);
3919 for (i = 0; i < args->buffer_count; i++) {
3920 exec2_list[i].handle = exec_list[i].handle;
3921 exec2_list[i].relocation_count = exec_list[i].relocation_count;
3922 exec2_list[i].relocs_ptr = exec_list[i].relocs_ptr;
3923 exec2_list[i].alignment = exec_list[i].alignment;
3924 exec2_list[i].offset = exec_list[i].offset;
3926 exec2_list[i].flags = EXEC_OBJECT_NEEDS_FENCE;
3928 exec2_list[i].flags = 0;
3931 exec2.buffers_ptr = args->buffers_ptr;
3932 exec2.buffer_count = args->buffer_count;
3933 exec2.batch_start_offset = args->batch_start_offset;
3934 exec2.batch_len = args->batch_len;
3935 exec2.DR1 = args->DR1;
3936 exec2.DR4 = args->DR4;
3937 exec2.num_cliprects = args->num_cliprects;
3938 exec2.cliprects_ptr = args->cliprects_ptr;
3939 exec2.flags = I915_EXEC_RENDER;
3941 ret = i915_gem_do_execbuffer(dev, data, file_priv, &exec2, exec2_list);
3943 /* Copy the new buffer offsets back to the user's exec list. */
3944 for (i = 0; i < args->buffer_count; i++)
3945 exec_list[i].offset = exec2_list[i].offset;
3946 /* ... and back out to userspace */
3947 ret = copy_to_user((struct drm_i915_relocation_entry __user *)
3948 (uintptr_t) args->buffers_ptr,
3950 sizeof(*exec_list) * args->buffer_count);
3953 DRM_ERROR("failed to copy %d exec entries "
3954 "back to user (%d)\n",
3955 args->buffer_count, ret);
3959 drm_free_large(exec_list);
3960 drm_free_large(exec2_list);
3965 i915_gem_execbuffer2(struct drm_device *dev, void *data,
3966 struct drm_file *file_priv)
3968 struct drm_i915_gem_execbuffer2 *args = data;
3969 struct drm_i915_gem_exec_object2 *exec2_list = NULL;
3973 DRM_INFO("buffers_ptr %d buffer_count %d len %08x\n",
3974 (int) args->buffers_ptr, args->buffer_count, args->batch_len);
3977 if (args->buffer_count < 1) {
3978 DRM_ERROR("execbuf2 with %d buffers\n", args->buffer_count);
3982 exec2_list = drm_malloc_ab(sizeof(*exec2_list), args->buffer_count);
3983 if (exec2_list == NULL) {
3984 DRM_ERROR("Failed to allocate exec list for %d buffers\n",
3985 args->buffer_count);
3988 ret = copy_from_user(exec2_list,
3989 (struct drm_i915_relocation_entry __user *)
3990 (uintptr_t) args->buffers_ptr,
3991 sizeof(*exec2_list) * args->buffer_count);
3993 DRM_ERROR("copy %d exec entries failed %d\n",
3994 args->buffer_count, ret);
3995 drm_free_large(exec2_list);
3999 ret = i915_gem_do_execbuffer(dev, data, file_priv, args, exec2_list);
4001 /* Copy the new buffer offsets back to the user's exec list. */
4002 ret = copy_to_user((struct drm_i915_relocation_entry __user *)
4003 (uintptr_t) args->buffers_ptr,
4005 sizeof(*exec2_list) * args->buffer_count);
4008 DRM_ERROR("failed to copy %d exec entries "
4009 "back to user (%d)\n",
4010 args->buffer_count, ret);
4014 drm_free_large(exec2_list);
4019 i915_gem_object_pin(struct drm_gem_object *obj, uint32_t alignment)
4021 struct drm_device *dev = obj->dev;
4022 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4025 BUG_ON(obj_priv->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT);
4027 i915_verify_inactive(dev, __FILE__, __LINE__);
4029 if (obj_priv->gtt_space != NULL) {
4031 alignment = i915_gem_get_gtt_alignment(obj);
4032 if (obj_priv->gtt_offset & (alignment - 1)) {
4033 WARN(obj_priv->pin_count,
4034 "bo is already pinned with incorrect alignment:"
4035 " offset=%x, req.alignment=%x\n",
4036 obj_priv->gtt_offset, alignment);
4037 ret = i915_gem_object_unbind(obj);
4043 if (obj_priv->gtt_space == NULL) {
4044 ret = i915_gem_object_bind_to_gtt(obj, alignment);
4049 obj_priv->pin_count++;
4051 /* If the object is not active and not pending a flush,
4052 * remove it from the inactive list
4054 if (obj_priv->pin_count == 1) {
4055 atomic_inc(&dev->pin_count);
4056 atomic_add(obj->size, &dev->pin_memory);
4057 if (!obj_priv->active &&
4058 (obj->write_domain & I915_GEM_GPU_DOMAINS) == 0)
4059 list_del_init(&obj_priv->list);
4061 i915_verify_inactive(dev, __FILE__, __LINE__);
4067 i915_gem_object_unpin(struct drm_gem_object *obj)
4069 struct drm_device *dev = obj->dev;
4070 drm_i915_private_t *dev_priv = dev->dev_private;
4071 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4073 i915_verify_inactive(dev, __FILE__, __LINE__);
4074 obj_priv->pin_count--;
4075 BUG_ON(obj_priv->pin_count < 0);
4076 BUG_ON(obj_priv->gtt_space == NULL);
4078 /* If the object is no longer pinned, and is
4079 * neither active nor being flushed, then stick it on
4082 if (obj_priv->pin_count == 0) {
4083 if (!obj_priv->active &&
4084 (obj->write_domain & I915_GEM_GPU_DOMAINS) == 0)
4085 list_move_tail(&obj_priv->list,
4086 &dev_priv->mm.inactive_list);
4087 atomic_dec(&dev->pin_count);
4088 atomic_sub(obj->size, &dev->pin_memory);
4090 i915_verify_inactive(dev, __FILE__, __LINE__);
4094 i915_gem_pin_ioctl(struct drm_device *dev, void *data,
4095 struct drm_file *file_priv)
4097 struct drm_i915_gem_pin *args = data;
4098 struct drm_gem_object *obj;
4099 struct drm_i915_gem_object *obj_priv;
4102 mutex_lock(&dev->struct_mutex);
4104 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4106 DRM_ERROR("Bad handle in i915_gem_pin_ioctl(): %d\n",
4108 mutex_unlock(&dev->struct_mutex);
4111 obj_priv = to_intel_bo(obj);
4113 if (obj_priv->madv != I915_MADV_WILLNEED) {
4114 DRM_ERROR("Attempting to pin a purgeable buffer\n");
4115 drm_gem_object_unreference(obj);
4116 mutex_unlock(&dev->struct_mutex);
4120 if (obj_priv->pin_filp != NULL && obj_priv->pin_filp != file_priv) {
4121 DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
4123 drm_gem_object_unreference(obj);
4124 mutex_unlock(&dev->struct_mutex);
4128 obj_priv->user_pin_count++;
4129 obj_priv->pin_filp = file_priv;
4130 if (obj_priv->user_pin_count == 1) {
4131 ret = i915_gem_object_pin(obj, args->alignment);
4133 drm_gem_object_unreference(obj);
4134 mutex_unlock(&dev->struct_mutex);
4139 /* XXX - flush the CPU caches for pinned objects
4140 * as the X server doesn't manage domains yet
4142 i915_gem_object_flush_cpu_write_domain(obj);
4143 args->offset = obj_priv->gtt_offset;
4144 drm_gem_object_unreference(obj);
4145 mutex_unlock(&dev->struct_mutex);
4151 i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
4152 struct drm_file *file_priv)
4154 struct drm_i915_gem_pin *args = data;
4155 struct drm_gem_object *obj;
4156 struct drm_i915_gem_object *obj_priv;
4158 mutex_lock(&dev->struct_mutex);
4160 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4162 DRM_ERROR("Bad handle in i915_gem_unpin_ioctl(): %d\n",
4164 mutex_unlock(&dev->struct_mutex);
4168 obj_priv = to_intel_bo(obj);
4169 if (obj_priv->pin_filp != file_priv) {
4170 DRM_ERROR("Not pinned by caller in i915_gem_pin_ioctl(): %d\n",
4172 drm_gem_object_unreference(obj);
4173 mutex_unlock(&dev->struct_mutex);
4176 obj_priv->user_pin_count--;
4177 if (obj_priv->user_pin_count == 0) {
4178 obj_priv->pin_filp = NULL;
4179 i915_gem_object_unpin(obj);
4182 drm_gem_object_unreference(obj);
4183 mutex_unlock(&dev->struct_mutex);
4188 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4189 struct drm_file *file_priv)
4191 struct drm_i915_gem_busy *args = data;
4192 struct drm_gem_object *obj;
4193 struct drm_i915_gem_object *obj_priv;
4195 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4197 DRM_ERROR("Bad handle in i915_gem_busy_ioctl(): %d\n",
4202 mutex_lock(&dev->struct_mutex);
4204 /* Count all active objects as busy, even if they are currently not used
4205 * by the gpu. Users of this interface expect objects to eventually
4206 * become non-busy without any further actions, therefore emit any
4207 * necessary flushes here.
4209 obj_priv = to_intel_bo(obj);
4210 args->busy = obj_priv->active;
4212 /* Unconditionally flush objects, even when the gpu still uses this
4213 * object. Userspace calling this function indicates that it wants to
4214 * use this buffer rather sooner than later, so issuing the required
4215 * flush earlier is beneficial.
4217 if (obj->write_domain) {
4218 i915_gem_flush(dev, 0, obj->write_domain);
4219 (void)i915_add_request(dev, file_priv, obj->write_domain, obj_priv->ring);
4222 /* Update the active list for the hardware's current position.
4223 * Otherwise this only updates on a delayed timer or when irqs
4224 * are actually unmasked, and our working set ends up being
4225 * larger than required.
4227 i915_gem_retire_requests_ring(dev, obj_priv->ring);
4229 args->busy = obj_priv->active;
4232 drm_gem_object_unreference(obj);
4233 mutex_unlock(&dev->struct_mutex);
4238 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4239 struct drm_file *file_priv)
4241 return i915_gem_ring_throttle(dev, file_priv);
4245 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4246 struct drm_file *file_priv)
4248 struct drm_i915_gem_madvise *args = data;
4249 struct drm_gem_object *obj;
4250 struct drm_i915_gem_object *obj_priv;
4252 switch (args->madv) {
4253 case I915_MADV_DONTNEED:
4254 case I915_MADV_WILLNEED:
4260 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
4262 DRM_ERROR("Bad handle in i915_gem_madvise_ioctl(): %d\n",
4267 mutex_lock(&dev->struct_mutex);
4268 obj_priv = to_intel_bo(obj);
4270 if (obj_priv->pin_count) {
4271 drm_gem_object_unreference(obj);
4272 mutex_unlock(&dev->struct_mutex);
4274 DRM_ERROR("Attempted i915_gem_madvise_ioctl() on a pinned object\n");
4278 if (obj_priv->madv != __I915_MADV_PURGED)
4279 obj_priv->madv = args->madv;
4281 /* if the object is no longer bound, discard its backing storage */
4282 if (i915_gem_object_is_purgeable(obj_priv) &&
4283 obj_priv->gtt_space == NULL)
4284 i915_gem_object_truncate(obj);
4286 args->retained = obj_priv->madv != __I915_MADV_PURGED;
4288 drm_gem_object_unreference(obj);
4289 mutex_unlock(&dev->struct_mutex);
4294 struct drm_gem_object * i915_gem_alloc_object(struct drm_device *dev,
4297 struct drm_i915_gem_object *obj;
4299 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
4303 if (drm_gem_object_init(dev, &obj->base, size) != 0) {
4308 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4309 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4311 obj->agp_type = AGP_USER_MEMORY;
4312 obj->base.driver_private = NULL;
4313 obj->fence_reg = I915_FENCE_REG_NONE;
4314 INIT_LIST_HEAD(&obj->list);
4315 INIT_LIST_HEAD(&obj->gpu_write_list);
4316 obj->madv = I915_MADV_WILLNEED;
4318 trace_i915_gem_object_create(&obj->base);
4323 int i915_gem_init_object(struct drm_gem_object *obj)
4330 static void i915_gem_free_object_tail(struct drm_gem_object *obj)
4332 struct drm_device *dev = obj->dev;
4333 drm_i915_private_t *dev_priv = dev->dev_private;
4334 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4337 ret = i915_gem_object_unbind(obj);
4338 if (ret == -ERESTARTSYS) {
4339 list_move(&obj_priv->list,
4340 &dev_priv->mm.deferred_free_list);
4344 if (obj_priv->mmap_offset)
4345 i915_gem_free_mmap_offset(obj);
4347 drm_gem_object_release(obj);
4349 kfree(obj_priv->page_cpu_valid);
4350 kfree(obj_priv->bit_17);
4354 void i915_gem_free_object(struct drm_gem_object *obj)
4356 struct drm_device *dev = obj->dev;
4357 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4359 trace_i915_gem_object_destroy(obj);
4361 while (obj_priv->pin_count > 0)
4362 i915_gem_object_unpin(obj);
4364 if (obj_priv->phys_obj)
4365 i915_gem_detach_phys_object(dev, obj);
4367 i915_gem_free_object_tail(obj);
4371 i915_gem_idle(struct drm_device *dev)
4373 drm_i915_private_t *dev_priv = dev->dev_private;
4376 mutex_lock(&dev->struct_mutex);
4378 if (dev_priv->mm.suspended ||
4379 (dev_priv->render_ring.gem_object == NULL) ||
4381 dev_priv->bsd_ring.gem_object == NULL)) {
4382 mutex_unlock(&dev->struct_mutex);
4386 ret = i915_gpu_idle(dev);
4388 mutex_unlock(&dev->struct_mutex);
4392 /* Under UMS, be paranoid and evict. */
4393 if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
4394 ret = i915_gem_evict_inactive(dev);
4396 mutex_unlock(&dev->struct_mutex);
4401 /* Hack! Don't let anybody do execbuf while we don't control the chip.
4402 * We need to replace this with a semaphore, or something.
4403 * And not confound mm.suspended!
4405 dev_priv->mm.suspended = 1;
4406 del_timer(&dev_priv->hangcheck_timer);
4408 i915_kernel_lost_context(dev);
4409 i915_gem_cleanup_ringbuffer(dev);
4411 mutex_unlock(&dev->struct_mutex);
4413 /* Cancel the retire work handler, which should be idle now. */
4414 cancel_delayed_work_sync(&dev_priv->mm.retire_work);
4420 * 965+ support PIPE_CONTROL commands, which provide finer grained control
4421 * over cache flushing.
4424 i915_gem_init_pipe_control(struct drm_device *dev)
4426 drm_i915_private_t *dev_priv = dev->dev_private;
4427 struct drm_gem_object *obj;
4428 struct drm_i915_gem_object *obj_priv;
4431 obj = i915_gem_alloc_object(dev, 4096);
4433 DRM_ERROR("Failed to allocate seqno page\n");
4437 obj_priv = to_intel_bo(obj);
4438 obj_priv->agp_type = AGP_USER_CACHED_MEMORY;
4440 ret = i915_gem_object_pin(obj, 4096);
4444 dev_priv->seqno_gfx_addr = obj_priv->gtt_offset;
4445 dev_priv->seqno_page = kmap(obj_priv->pages[0]);
4446 if (dev_priv->seqno_page == NULL)
4449 dev_priv->seqno_obj = obj;
4450 memset(dev_priv->seqno_page, 0, PAGE_SIZE);
4455 i915_gem_object_unpin(obj);
4457 drm_gem_object_unreference(obj);
4464 i915_gem_cleanup_pipe_control(struct drm_device *dev)
4466 drm_i915_private_t *dev_priv = dev->dev_private;
4467 struct drm_gem_object *obj;
4468 struct drm_i915_gem_object *obj_priv;
4470 obj = dev_priv->seqno_obj;
4471 obj_priv = to_intel_bo(obj);
4472 kunmap(obj_priv->pages[0]);
4473 i915_gem_object_unpin(obj);
4474 drm_gem_object_unreference(obj);
4475 dev_priv->seqno_obj = NULL;
4477 dev_priv->seqno_page = NULL;
4481 i915_gem_init_ringbuffer(struct drm_device *dev)
4483 drm_i915_private_t *dev_priv = dev->dev_private;
4486 dev_priv->render_ring = render_ring;
4488 if (!I915_NEED_GFX_HWS(dev)) {
4489 dev_priv->render_ring.status_page.page_addr
4490 = dev_priv->status_page_dmah->vaddr;
4491 memset(dev_priv->render_ring.status_page.page_addr,
4495 if (HAS_PIPE_CONTROL(dev)) {
4496 ret = i915_gem_init_pipe_control(dev);
4501 ret = intel_init_ring_buffer(dev, &dev_priv->render_ring);
4503 goto cleanup_pipe_control;
4506 dev_priv->bsd_ring = bsd_ring;
4507 ret = intel_init_ring_buffer(dev, &dev_priv->bsd_ring);
4509 goto cleanup_render_ring;
4512 dev_priv->next_seqno = 1;
4516 cleanup_render_ring:
4517 intel_cleanup_ring_buffer(dev, &dev_priv->render_ring);
4518 cleanup_pipe_control:
4519 if (HAS_PIPE_CONTROL(dev))
4520 i915_gem_cleanup_pipe_control(dev);
4525 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
4527 drm_i915_private_t *dev_priv = dev->dev_private;
4529 intel_cleanup_ring_buffer(dev, &dev_priv->render_ring);
4531 intel_cleanup_ring_buffer(dev, &dev_priv->bsd_ring);
4532 if (HAS_PIPE_CONTROL(dev))
4533 i915_gem_cleanup_pipe_control(dev);
4537 i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
4538 struct drm_file *file_priv)
4540 drm_i915_private_t *dev_priv = dev->dev_private;
4543 if (drm_core_check_feature(dev, DRIVER_MODESET))
4546 if (atomic_read(&dev_priv->mm.wedged)) {
4547 DRM_ERROR("Reenabling wedged hardware, good luck\n");
4548 atomic_set(&dev_priv->mm.wedged, 0);
4551 mutex_lock(&dev->struct_mutex);
4552 dev_priv->mm.suspended = 0;
4554 ret = i915_gem_init_ringbuffer(dev);
4556 mutex_unlock(&dev->struct_mutex);
4560 spin_lock(&dev_priv->mm.active_list_lock);
4561 BUG_ON(!list_empty(&dev_priv->render_ring.active_list));
4562 BUG_ON(HAS_BSD(dev) && !list_empty(&dev_priv->bsd_ring.active_list));
4563 spin_unlock(&dev_priv->mm.active_list_lock);
4565 BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
4566 BUG_ON(!list_empty(&dev_priv->mm.inactive_list));
4567 BUG_ON(!list_empty(&dev_priv->render_ring.request_list));
4568 BUG_ON(HAS_BSD(dev) && !list_empty(&dev_priv->bsd_ring.request_list));
4569 mutex_unlock(&dev->struct_mutex);
4571 ret = drm_irq_install(dev);
4573 goto cleanup_ringbuffer;
4578 mutex_lock(&dev->struct_mutex);
4579 i915_gem_cleanup_ringbuffer(dev);
4580 dev_priv->mm.suspended = 1;
4581 mutex_unlock(&dev->struct_mutex);
4587 i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
4588 struct drm_file *file_priv)
4590 if (drm_core_check_feature(dev, DRIVER_MODESET))
4593 drm_irq_uninstall(dev);
4594 return i915_gem_idle(dev);
4598 i915_gem_lastclose(struct drm_device *dev)
4602 if (drm_core_check_feature(dev, DRIVER_MODESET))
4605 ret = i915_gem_idle(dev);
4607 DRM_ERROR("failed to idle hardware: %d\n", ret);
4611 i915_gem_load(struct drm_device *dev)
4614 drm_i915_private_t *dev_priv = dev->dev_private;
4616 spin_lock_init(&dev_priv->mm.active_list_lock);
4617 INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
4618 INIT_LIST_HEAD(&dev_priv->mm.gpu_write_list);
4619 INIT_LIST_HEAD(&dev_priv->mm.inactive_list);
4620 INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4621 INIT_LIST_HEAD(&dev_priv->mm.deferred_free_list);
4622 INIT_LIST_HEAD(&dev_priv->render_ring.active_list);
4623 INIT_LIST_HEAD(&dev_priv->render_ring.request_list);
4625 INIT_LIST_HEAD(&dev_priv->bsd_ring.active_list);
4626 INIT_LIST_HEAD(&dev_priv->bsd_ring.request_list);
4628 for (i = 0; i < 16; i++)
4629 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
4630 INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
4631 i915_gem_retire_work_handler);
4632 spin_lock(&shrink_list_lock);
4633 list_add(&dev_priv->mm.shrink_list, &shrink_list);
4634 spin_unlock(&shrink_list_lock);
4636 /* On GEN3 we really need to make sure the ARB C3 LP bit is set */
4638 u32 tmp = I915_READ(MI_ARB_STATE);
4639 if (!(tmp & MI_ARB_C3_LP_WRITE_ENABLE)) {
4640 /* arb state is a masked write, so set bit + bit in mask */
4641 tmp = MI_ARB_C3_LP_WRITE_ENABLE | (MI_ARB_C3_LP_WRITE_ENABLE << MI_ARB_MASK_SHIFT);
4642 I915_WRITE(MI_ARB_STATE, tmp);
4646 /* Old X drivers will take 0-2 for front, back, depth buffers */
4647 if (!drm_core_check_feature(dev, DRIVER_MODESET))
4648 dev_priv->fence_reg_start = 3;
4650 if (IS_I965G(dev) || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4651 dev_priv->num_fence_regs = 16;
4653 dev_priv->num_fence_regs = 8;
4655 /* Initialize fence registers to zero */
4656 if (IS_I965G(dev)) {
4657 for (i = 0; i < 16; i++)
4658 I915_WRITE64(FENCE_REG_965_0 + (i * 8), 0);
4660 for (i = 0; i < 8; i++)
4661 I915_WRITE(FENCE_REG_830_0 + (i * 4), 0);
4662 if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4663 for (i = 0; i < 8; i++)
4664 I915_WRITE(FENCE_REG_945_8 + (i * 4), 0);
4666 i915_gem_detect_bit_6_swizzle(dev);
4667 init_waitqueue_head(&dev_priv->pending_flip_queue);
4671 * Create a physically contiguous memory object for this object
4672 * e.g. for cursor + overlay regs
4674 int i915_gem_init_phys_object(struct drm_device *dev,
4675 int id, int size, int align)
4677 drm_i915_private_t *dev_priv = dev->dev_private;
4678 struct drm_i915_gem_phys_object *phys_obj;
4681 if (dev_priv->mm.phys_objs[id - 1] || !size)
4684 phys_obj = kzalloc(sizeof(struct drm_i915_gem_phys_object), GFP_KERNEL);
4690 phys_obj->handle = drm_pci_alloc(dev, size, align);
4691 if (!phys_obj->handle) {
4696 set_memory_wc((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
4699 dev_priv->mm.phys_objs[id - 1] = phys_obj;
4707 void i915_gem_free_phys_object(struct drm_device *dev, int id)
4709 drm_i915_private_t *dev_priv = dev->dev_private;
4710 struct drm_i915_gem_phys_object *phys_obj;
4712 if (!dev_priv->mm.phys_objs[id - 1])
4715 phys_obj = dev_priv->mm.phys_objs[id - 1];
4716 if (phys_obj->cur_obj) {
4717 i915_gem_detach_phys_object(dev, phys_obj->cur_obj);
4721 set_memory_wb((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
4723 drm_pci_free(dev, phys_obj->handle);
4725 dev_priv->mm.phys_objs[id - 1] = NULL;
4728 void i915_gem_free_all_phys_object(struct drm_device *dev)
4732 for (i = I915_GEM_PHYS_CURSOR_0; i <= I915_MAX_PHYS_OBJECT; i++)
4733 i915_gem_free_phys_object(dev, i);
4736 void i915_gem_detach_phys_object(struct drm_device *dev,
4737 struct drm_gem_object *obj)
4739 struct drm_i915_gem_object *obj_priv;
4744 obj_priv = to_intel_bo(obj);
4745 if (!obj_priv->phys_obj)
4748 ret = i915_gem_object_get_pages(obj, 0);
4752 page_count = obj->size / PAGE_SIZE;
4754 for (i = 0; i < page_count; i++) {
4755 char *dst = kmap_atomic(obj_priv->pages[i], KM_USER0);
4756 char *src = obj_priv->phys_obj->handle->vaddr + (i * PAGE_SIZE);
4758 memcpy(dst, src, PAGE_SIZE);
4759 kunmap_atomic(dst, KM_USER0);
4761 drm_clflush_pages(obj_priv->pages, page_count);
4762 drm_agp_chipset_flush(dev);
4764 i915_gem_object_put_pages(obj);
4766 obj_priv->phys_obj->cur_obj = NULL;
4767 obj_priv->phys_obj = NULL;
4771 i915_gem_attach_phys_object(struct drm_device *dev,
4772 struct drm_gem_object *obj,
4776 drm_i915_private_t *dev_priv = dev->dev_private;
4777 struct drm_i915_gem_object *obj_priv;
4782 if (id > I915_MAX_PHYS_OBJECT)
4785 obj_priv = to_intel_bo(obj);
4787 if (obj_priv->phys_obj) {
4788 if (obj_priv->phys_obj->id == id)
4790 i915_gem_detach_phys_object(dev, obj);
4793 /* create a new object */
4794 if (!dev_priv->mm.phys_objs[id - 1]) {
4795 ret = i915_gem_init_phys_object(dev, id,
4798 DRM_ERROR("failed to init phys object %d size: %zu\n", id, obj->size);
4803 /* bind to the object */
4804 obj_priv->phys_obj = dev_priv->mm.phys_objs[id - 1];
4805 obj_priv->phys_obj->cur_obj = obj;
4807 ret = i915_gem_object_get_pages(obj, 0);
4809 DRM_ERROR("failed to get page list\n");
4813 page_count = obj->size / PAGE_SIZE;
4815 for (i = 0; i < page_count; i++) {
4816 char *src = kmap_atomic(obj_priv->pages[i], KM_USER0);
4817 char *dst = obj_priv->phys_obj->handle->vaddr + (i * PAGE_SIZE);
4819 memcpy(dst, src, PAGE_SIZE);
4820 kunmap_atomic(src, KM_USER0);
4823 i915_gem_object_put_pages(obj);
4831 i915_gem_phys_pwrite(struct drm_device *dev, struct drm_gem_object *obj,
4832 struct drm_i915_gem_pwrite *args,
4833 struct drm_file *file_priv)
4835 struct drm_i915_gem_object *obj_priv = to_intel_bo(obj);
4838 char __user *user_data;
4840 user_data = (char __user *) (uintptr_t) args->data_ptr;
4841 obj_addr = obj_priv->phys_obj->handle->vaddr + args->offset;
4843 DRM_DEBUG_DRIVER("obj_addr %p, %lld\n", obj_addr, args->size);
4844 ret = copy_from_user(obj_addr, user_data, args->size);
4848 drm_agp_chipset_flush(dev);
4852 void i915_gem_release(struct drm_device * dev, struct drm_file *file_priv)
4854 struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
4856 /* Clean up our request list when the client is going away, so that
4857 * later retire_requests won't dereference our soon-to-be-gone
4860 mutex_lock(&dev->struct_mutex);
4861 while (!list_empty(&i915_file_priv->mm.request_list))
4862 list_del_init(i915_file_priv->mm.request_list.next);
4863 mutex_unlock(&dev->struct_mutex);
4867 i915_gpu_is_active(struct drm_device *dev)
4869 drm_i915_private_t *dev_priv = dev->dev_private;
4872 spin_lock(&dev_priv->mm.active_list_lock);
4873 lists_empty = list_empty(&dev_priv->mm.flushing_list) &&
4874 list_empty(&dev_priv->render_ring.active_list);
4876 lists_empty &= list_empty(&dev_priv->bsd_ring.active_list);
4877 spin_unlock(&dev_priv->mm.active_list_lock);
4879 return !lists_empty;
4883 i915_gem_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
4885 drm_i915_private_t *dev_priv, *next_dev;
4886 struct drm_i915_gem_object *obj_priv, *next_obj;
4888 int would_deadlock = 1;
4890 /* "fast-path" to count number of available objects */
4891 if (nr_to_scan == 0) {
4892 spin_lock(&shrink_list_lock);
4893 list_for_each_entry(dev_priv, &shrink_list, mm.shrink_list) {
4894 struct drm_device *dev = dev_priv->dev;
4896 if (mutex_trylock(&dev->struct_mutex)) {
4897 list_for_each_entry(obj_priv,
4898 &dev_priv->mm.inactive_list,
4901 mutex_unlock(&dev->struct_mutex);
4904 spin_unlock(&shrink_list_lock);
4906 return (cnt / 100) * sysctl_vfs_cache_pressure;
4909 spin_lock(&shrink_list_lock);
4912 /* first scan for clean buffers */
4913 list_for_each_entry_safe(dev_priv, next_dev,
4914 &shrink_list, mm.shrink_list) {
4915 struct drm_device *dev = dev_priv->dev;
4917 if (! mutex_trylock(&dev->struct_mutex))
4920 spin_unlock(&shrink_list_lock);
4921 i915_gem_retire_requests(dev);
4923 list_for_each_entry_safe(obj_priv, next_obj,
4924 &dev_priv->mm.inactive_list,
4926 if (i915_gem_object_is_purgeable(obj_priv)) {
4927 i915_gem_object_unbind(&obj_priv->base);
4928 if (--nr_to_scan <= 0)
4933 spin_lock(&shrink_list_lock);
4934 mutex_unlock(&dev->struct_mutex);
4938 if (nr_to_scan <= 0)
4942 /* second pass, evict/count anything still on the inactive list */
4943 list_for_each_entry_safe(dev_priv, next_dev,
4944 &shrink_list, mm.shrink_list) {
4945 struct drm_device *dev = dev_priv->dev;
4947 if (! mutex_trylock(&dev->struct_mutex))
4950 spin_unlock(&shrink_list_lock);
4952 list_for_each_entry_safe(obj_priv, next_obj,
4953 &dev_priv->mm.inactive_list,
4955 if (nr_to_scan > 0) {
4956 i915_gem_object_unbind(&obj_priv->base);
4962 spin_lock(&shrink_list_lock);
4963 mutex_unlock(&dev->struct_mutex);
4972 * We are desperate for pages, so as a last resort, wait
4973 * for the GPU to finish and discard whatever we can.
4974 * This has a dramatic impact to reduce the number of
4975 * OOM-killer events whilst running the GPU aggressively.
4977 list_for_each_entry(dev_priv, &shrink_list, mm.shrink_list) {
4978 struct drm_device *dev = dev_priv->dev;
4980 if (!mutex_trylock(&dev->struct_mutex))
4983 spin_unlock(&shrink_list_lock);
4985 if (i915_gpu_is_active(dev)) {
4990 spin_lock(&shrink_list_lock);
4991 mutex_unlock(&dev->struct_mutex);
4998 spin_unlock(&shrink_list_lock);
5003 return (cnt / 100) * sysctl_vfs_cache_pressure;
5008 static struct shrinker shrinker = {
5009 .shrink = i915_gem_shrink,
5010 .seeks = DEFAULT_SEEKS,
5014 i915_gem_shrinker_init(void)
5016 register_shrinker(&shrinker);
5020 i915_gem_shrinker_exit(void)
5022 unregister_shrinker(&shrinker);