2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
18 #include <linux/spinlock.h>
19 #include <linux/shmem_fs.h>
26 /* called with dev->struct_mutex held */
27 static struct page **get_pages(struct drm_gem_object *obj)
29 struct msm_gem_object *msm_obj = to_msm_bo(obj);
31 if (!msm_obj->pages) {
32 struct drm_device *dev = obj->dev;
33 struct page **p = drm_gem_get_pages(obj, 0);
34 int npages = obj->size >> PAGE_SHIFT;
37 dev_err(dev->dev, "could not get pages: %ld\n",
42 msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
43 if (IS_ERR(msm_obj->sgt)) {
44 dev_err(dev->dev, "failed to allocate sgt\n");
45 return ERR_CAST(msm_obj->sgt);
50 /* For non-cached buffers, ensure the new pages are clean
51 * because display controller, GPU, etc. are not coherent:
53 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
54 dma_map_sg(dev->dev, msm_obj->sgt->sgl,
55 msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
58 return msm_obj->pages;
61 static void put_pages(struct drm_gem_object *obj)
63 struct msm_gem_object *msm_obj = to_msm_bo(obj);
66 /* For non-cached buffers, ensure the new pages are clean
67 * because display controller, GPU, etc. are not coherent:
69 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
70 dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
71 msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
72 sg_free_table(msm_obj->sgt);
75 drm_gem_put_pages(obj, msm_obj->pages, true, false);
76 msm_obj->pages = NULL;
80 int msm_gem_mmap_obj(struct drm_gem_object *obj,
81 struct vm_area_struct *vma)
83 struct msm_gem_object *msm_obj = to_msm_bo(obj);
85 vma->vm_flags &= ~VM_PFNMAP;
86 vma->vm_flags |= VM_MIXEDMAP;
88 if (msm_obj->flags & MSM_BO_WC) {
89 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
90 } else if (msm_obj->flags & MSM_BO_UNCACHED) {
91 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
94 * Shunt off cached objs to shmem file so they have their own
95 * address_space (so unmap_mapping_range does what we want,
96 * in particular in the case of mmap'd dmabufs)
101 vma->vm_file = obj->filp;
103 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
109 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
113 ret = drm_gem_mmap(filp, vma);
115 DBG("mmap failed: %d", ret);
119 return msm_gem_mmap_obj(vma->vm_private_data, vma);
122 int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
124 struct drm_gem_object *obj = vma->vm_private_data;
125 struct msm_gem_object *msm_obj = to_msm_bo(obj);
126 struct drm_device *dev = obj->dev;
132 /* Make sure we don't parallel update on a fault, nor move or remove
133 * something from beneath our feet
135 ret = mutex_lock_interruptible(&dev->struct_mutex);
139 /* make sure we have pages attached now */
140 pages = get_pages(obj);
142 ret = PTR_ERR(pages);
146 /* We don't use vmf->pgoff since that has the fake offset: */
147 pgoff = ((unsigned long)vmf->virtual_address -
148 vma->vm_start) >> PAGE_SHIFT;
150 pfn = page_to_pfn(msm_obj->pages[pgoff]);
152 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
153 pfn, pfn << PAGE_SHIFT);
155 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
158 mutex_unlock(&dev->struct_mutex);
165 return VM_FAULT_NOPAGE;
169 return VM_FAULT_SIGBUS;
173 /** get mmap offset */
174 static uint64_t mmap_offset(struct drm_gem_object *obj)
176 struct drm_device *dev = obj->dev;
179 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
181 /* Make it mmapable */
182 ret = drm_gem_create_mmap_offset(obj);
185 dev_err(dev->dev, "could not allocate mmap offset\n");
189 return drm_vma_node_offset_addr(&obj->vma_node);
192 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
195 mutex_lock(&obj->dev->struct_mutex);
196 offset = mmap_offset(obj);
197 mutex_unlock(&obj->dev->struct_mutex);
201 /* helpers for dealing w/ iommu: */
202 static int map_range(struct iommu_domain *domain, unsigned int iova,
203 struct sg_table *sgt, unsigned int len, int prot)
205 struct scatterlist *sg;
206 unsigned int da = iova;
213 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
214 u32 pa = sg_phys(sg) - sg->offset;
215 size_t bytes = sg->length + sg->offset;
217 VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes);
219 ret = iommu_map(domain, da, pa, bytes, prot);
231 for_each_sg(sgt->sgl, sg, i, j) {
232 size_t bytes = sg->length + sg->offset;
233 iommu_unmap(domain, da, bytes);
239 static void unmap_range(struct iommu_domain *domain, unsigned int iova,
240 struct sg_table *sgt, unsigned int len)
242 struct scatterlist *sg;
243 unsigned int da = iova;
246 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
247 size_t bytes = sg->length + sg->offset;
250 unmapped = iommu_unmap(domain, da, bytes);
251 if (unmapped < bytes)
254 VERB("unmap[%d]: %08x(%x)", i, iova, bytes);
256 BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
262 /* should be called under struct_mutex.. although it can be called
263 * from atomic context without struct_mutex to acquire an extra
264 * iova ref if you know one is already held.
266 * That means when I do eventually need to add support for unpinning
267 * the refcnt counter needs to be atomic_t.
269 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
272 struct msm_gem_object *msm_obj = to_msm_bo(obj);
275 if (!msm_obj->domain[id].iova) {
276 struct msm_drm_private *priv = obj->dev->dev_private;
277 uint32_t offset = (uint32_t)mmap_offset(obj);
279 pages = get_pages(obj);
281 return PTR_ERR(pages);
282 // XXX ideally we would not map buffers writable when not needed...
283 ret = map_range(priv->iommus[id], offset, msm_obj->sgt,
284 obj->size, IOMMU_READ | IOMMU_WRITE);
285 msm_obj->domain[id].iova = offset;
289 *iova = msm_obj->domain[id].iova;
294 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
297 mutex_lock(&obj->dev->struct_mutex);
298 ret = msm_gem_get_iova_locked(obj, id, iova);
299 mutex_unlock(&obj->dev->struct_mutex);
303 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
306 // NOTE: probably don't need a _locked() version.. we wouldn't
307 // normally unmap here, but instead just mark that it could be
308 // unmapped (if the iova refcnt drops to zero), but then later
309 // if another _get_iova_locked() fails we can start unmapping
310 // things that are no longer needed..
313 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
314 struct drm_mode_create_dumb *args)
316 args->pitch = align_pitch(args->width, args->bpp);
317 args->size = PAGE_ALIGN(args->pitch * args->height);
318 return msm_gem_new_handle(dev, file, args->size,
319 MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
322 int msm_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
325 /* No special work needed, drop the reference and see what falls out */
326 return drm_gem_handle_delete(file, handle);
329 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
330 uint32_t handle, uint64_t *offset)
332 struct drm_gem_object *obj;
335 /* GEM does all our handle to object mapping */
336 obj = drm_gem_object_lookup(dev, file, handle);
342 *offset = msm_gem_mmap_offset(obj);
344 drm_gem_object_unreference_unlocked(obj);
350 void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
352 struct msm_gem_object *msm_obj = to_msm_bo(obj);
353 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
354 if (!msm_obj->vaddr) {
355 struct page **pages = get_pages(obj);
357 return ERR_CAST(pages);
358 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
359 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
361 return msm_obj->vaddr;
364 void *msm_gem_vaddr(struct drm_gem_object *obj)
367 mutex_lock(&obj->dev->struct_mutex);
368 ret = msm_gem_vaddr_locked(obj);
369 mutex_unlock(&obj->dev->struct_mutex);
373 int msm_gem_queue_inactive_work(struct drm_gem_object *obj,
374 struct work_struct *work)
376 struct drm_device *dev = obj->dev;
377 struct msm_drm_private *priv = dev->dev_private;
378 struct msm_gem_object *msm_obj = to_msm_bo(obj);
381 mutex_lock(&dev->struct_mutex);
382 if (!list_empty(&work->entry)) {
384 } else if (is_active(msm_obj)) {
385 list_add_tail(&work->entry, &msm_obj->inactive_work);
387 queue_work(priv->wq, work);
389 mutex_unlock(&dev->struct_mutex);
394 void msm_gem_move_to_active(struct drm_gem_object *obj,
395 struct msm_gpu *gpu, bool write, uint32_t fence)
397 struct msm_gem_object *msm_obj = to_msm_bo(obj);
400 msm_obj->write_fence = fence;
402 msm_obj->read_fence = fence;
403 list_del_init(&msm_obj->mm_list);
404 list_add_tail(&msm_obj->mm_list, &gpu->active_list);
407 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
409 struct drm_device *dev = obj->dev;
410 struct msm_drm_private *priv = dev->dev_private;
411 struct msm_gem_object *msm_obj = to_msm_bo(obj);
413 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
416 msm_obj->read_fence = 0;
417 msm_obj->write_fence = 0;
418 list_del_init(&msm_obj->mm_list);
419 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
421 while (!list_empty(&msm_obj->inactive_work)) {
422 struct work_struct *work;
424 work = list_first_entry(&msm_obj->inactive_work,
425 struct work_struct, entry);
427 list_del_init(&work->entry);
428 queue_work(priv->wq, work);
432 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op,
433 struct timespec *timeout)
435 struct drm_device *dev = obj->dev;
436 struct msm_gem_object *msm_obj = to_msm_bo(obj);
439 if (is_active(msm_obj)) {
442 if (op & MSM_PREP_READ)
443 fence = msm_obj->write_fence;
444 if (op & MSM_PREP_WRITE)
445 fence = max(fence, msm_obj->read_fence);
446 if (op & MSM_PREP_NOSYNC)
449 ret = msm_wait_fence_interruptable(dev, fence, timeout);
452 /* TODO cache maintenance */
457 int msm_gem_cpu_fini(struct drm_gem_object *obj)
459 /* TODO cache maintenance */
463 #ifdef CONFIG_DEBUG_FS
464 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
466 struct drm_device *dev = obj->dev;
467 struct msm_gem_object *msm_obj = to_msm_bo(obj);
468 uint64_t off = drm_vma_node_start(&obj->vma_node);
470 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
471 seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %d\n",
472 msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
473 msm_obj->read_fence, msm_obj->write_fence,
474 obj->name, obj->refcount.refcount.counter,
475 off, msm_obj->vaddr, obj->size);
478 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
480 struct msm_gem_object *msm_obj;
484 list_for_each_entry(msm_obj, list, mm_list) {
485 struct drm_gem_object *obj = &msm_obj->base;
487 msm_gem_describe(obj, m);
492 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
496 void msm_gem_free_object(struct drm_gem_object *obj)
498 struct drm_device *dev = obj->dev;
499 struct msm_gem_object *msm_obj = to_msm_bo(obj);
502 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
504 /* object should not be on active list: */
505 WARN_ON(is_active(msm_obj));
507 list_del(&msm_obj->mm_list);
509 for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
510 if (msm_obj->domain[id].iova) {
511 struct msm_drm_private *priv = obj->dev->dev_private;
512 uint32_t offset = (uint32_t)mmap_offset(obj);
513 unmap_range(priv->iommus[id], offset,
514 msm_obj->sgt, obj->size);
518 drm_gem_free_mmap_offset(obj);
521 vunmap(msm_obj->vaddr);
525 if (msm_obj->resv == &msm_obj->_resv)
526 reservation_object_fini(msm_obj->resv);
528 drm_gem_object_release(obj);
533 /* convenience method to construct a GEM buffer object, and userspace handle */
534 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
535 uint32_t size, uint32_t flags, uint32_t *handle)
537 struct drm_gem_object *obj;
540 ret = mutex_lock_interruptible(&dev->struct_mutex);
544 obj = msm_gem_new(dev, size, flags);
546 mutex_unlock(&dev->struct_mutex);
551 ret = drm_gem_handle_create(file, obj, handle);
553 /* drop reference from allocate - handle holds it now */
554 drm_gem_object_unreference_unlocked(obj);
559 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
560 uint32_t size, uint32_t flags)
562 struct msm_drm_private *priv = dev->dev_private;
563 struct msm_gem_object *msm_obj;
564 struct drm_gem_object *obj = NULL;
567 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
569 size = PAGE_ALIGN(size);
571 switch (flags & MSM_BO_CACHE_MASK) {
572 case MSM_BO_UNCACHED:
577 dev_err(dev->dev, "invalid cache flag: %x\n",
578 (flags & MSM_BO_CACHE_MASK));
583 msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
589 obj = &msm_obj->base;
591 ret = drm_gem_object_init(dev, obj, size);
595 msm_obj->flags = flags;
597 msm_obj->resv = &msm_obj->_resv;
598 reservation_object_init(msm_obj->resv);
600 INIT_LIST_HEAD(&msm_obj->submit_entry);
601 INIT_LIST_HEAD(&msm_obj->inactive_work);
602 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
608 drm_gem_object_unreference_unlocked(obj);