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);
44 dev_err(dev->dev, "failed to allocate sgt\n");
45 return ERR_PTR(-ENOMEM);
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);
166 return VM_FAULT_NOPAGE;
170 return VM_FAULT_SIGBUS;
174 /** get mmap offset */
175 static uint64_t mmap_offset(struct drm_gem_object *obj)
177 struct drm_device *dev = obj->dev;
180 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
182 /* Make it mmapable */
183 ret = drm_gem_create_mmap_offset(obj);
186 dev_err(dev->dev, "could not allocate mmap offset\n");
190 return drm_vma_node_offset_addr(&obj->vma_node);
193 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
196 mutex_lock(&obj->dev->struct_mutex);
197 offset = mmap_offset(obj);
198 mutex_unlock(&obj->dev->struct_mutex);
202 /* helpers for dealing w/ iommu: */
203 static int map_range(struct iommu_domain *domain, unsigned int iova,
204 struct sg_table *sgt, unsigned int len, int prot)
206 struct scatterlist *sg;
207 unsigned int da = iova;
214 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
215 u32 pa = sg_phys(sg) - sg->offset;
216 size_t bytes = sg->length + sg->offset;
218 VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes);
220 ret = iommu_map(domain, da, pa, bytes, prot);
232 for_each_sg(sgt->sgl, sg, i, j) {
233 size_t bytes = sg->length + sg->offset;
234 iommu_unmap(domain, da, bytes);
240 static void unmap_range(struct iommu_domain *domain, unsigned int iova,
241 struct sg_table *sgt, unsigned int len)
243 struct scatterlist *sg;
244 unsigned int da = iova;
247 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
248 size_t bytes = sg->length + sg->offset;
251 unmapped = iommu_unmap(domain, da, bytes);
252 if (unmapped < bytes)
255 VERB("unmap[%d]: %08x(%x)", i, iova, bytes);
257 BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
263 /* should be called under struct_mutex.. although it can be called
264 * from atomic context without struct_mutex to acquire an extra
265 * iova ref if you know one is already held.
267 * That means when I do eventually need to add support for unpinning
268 * the refcnt counter needs to be atomic_t.
270 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
273 struct msm_gem_object *msm_obj = to_msm_bo(obj);
276 if (!msm_obj->domain[id].iova) {
277 struct msm_drm_private *priv = obj->dev->dev_private;
278 uint32_t offset = (uint32_t)mmap_offset(obj);
280 pages = get_pages(obj);
282 return PTR_ERR(pages);
283 // XXX ideally we would not map buffers writable when not needed...
284 ret = map_range(priv->iommus[id], offset, msm_obj->sgt,
285 obj->size, IOMMU_READ | IOMMU_WRITE);
286 msm_obj->domain[id].iova = offset;
290 *iova = msm_obj->domain[id].iova;
295 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
298 mutex_lock(&obj->dev->struct_mutex);
299 ret = msm_gem_get_iova_locked(obj, id, iova);
300 mutex_unlock(&obj->dev->struct_mutex);
304 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
307 // NOTE: probably don't need a _locked() version.. we wouldn't
308 // normally unmap here, but instead just mark that it could be
309 // unmapped (if the iova refcnt drops to zero), but then later
310 // if another _get_iova_locked() fails we can start unmapping
311 // things that are no longer needed..
314 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
315 struct drm_mode_create_dumb *args)
317 args->pitch = align_pitch(args->width, args->bpp);
318 args->size = PAGE_ALIGN(args->pitch * args->height);
319 return msm_gem_new_handle(dev, file, args->size,
320 MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
323 int msm_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
326 /* No special work needed, drop the reference and see what falls out */
327 return drm_gem_handle_delete(file, handle);
330 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
331 uint32_t handle, uint64_t *offset)
333 struct drm_gem_object *obj;
336 /* GEM does all our handle to object mapping */
337 obj = drm_gem_object_lookup(dev, file, handle);
343 *offset = msm_gem_mmap_offset(obj);
345 drm_gem_object_unreference_unlocked(obj);
351 void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
353 struct msm_gem_object *msm_obj = to_msm_bo(obj);
354 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
355 if (!msm_obj->vaddr) {
356 struct page **pages = get_pages(obj);
358 return ERR_CAST(pages);
359 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
360 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
362 return msm_obj->vaddr;
365 void *msm_gem_vaddr(struct drm_gem_object *obj)
368 mutex_lock(&obj->dev->struct_mutex);
369 ret = msm_gem_vaddr_locked(obj);
370 mutex_unlock(&obj->dev->struct_mutex);
374 int msm_gem_queue_inactive_work(struct drm_gem_object *obj,
375 struct work_struct *work)
377 struct drm_device *dev = obj->dev;
378 struct msm_drm_private *priv = dev->dev_private;
379 struct msm_gem_object *msm_obj = to_msm_bo(obj);
382 mutex_lock(&dev->struct_mutex);
383 if (!list_empty(&work->entry)) {
385 } else if (is_active(msm_obj)) {
386 list_add_tail(&work->entry, &msm_obj->inactive_work);
388 queue_work(priv->wq, work);
390 mutex_unlock(&dev->struct_mutex);
395 void msm_gem_move_to_active(struct drm_gem_object *obj,
396 struct msm_gpu *gpu, bool write, uint32_t fence)
398 struct msm_gem_object *msm_obj = to_msm_bo(obj);
401 msm_obj->write_fence = fence;
403 msm_obj->read_fence = fence;
404 list_del_init(&msm_obj->mm_list);
405 list_add_tail(&msm_obj->mm_list, &gpu->active_list);
408 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
410 struct drm_device *dev = obj->dev;
411 struct msm_drm_private *priv = dev->dev_private;
412 struct msm_gem_object *msm_obj = to_msm_bo(obj);
414 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
417 msm_obj->read_fence = 0;
418 msm_obj->write_fence = 0;
419 list_del_init(&msm_obj->mm_list);
420 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
422 while (!list_empty(&msm_obj->inactive_work)) {
423 struct work_struct *work;
425 work = list_first_entry(&msm_obj->inactive_work,
426 struct work_struct, entry);
428 list_del_init(&work->entry);
429 queue_work(priv->wq, work);
433 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op,
434 struct timespec *timeout)
436 struct drm_device *dev = obj->dev;
437 struct msm_gem_object *msm_obj = to_msm_bo(obj);
440 if (is_active(msm_obj) && !(op & MSM_PREP_NOSYNC)) {
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 ret = msm_wait_fence_interruptable(dev, fence, timeout);
449 /* TODO cache maintenance */
454 int msm_gem_cpu_fini(struct drm_gem_object *obj)
456 /* TODO cache maintenance */
460 #ifdef CONFIG_DEBUG_FS
461 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
463 struct drm_device *dev = obj->dev;
464 struct msm_gem_object *msm_obj = to_msm_bo(obj);
465 uint64_t off = drm_vma_node_start(&obj->vma_node);
467 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
468 seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %d\n",
469 msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
470 msm_obj->read_fence, msm_obj->write_fence,
471 obj->name, obj->refcount.refcount.counter,
472 off, msm_obj->vaddr, obj->size);
475 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
477 struct msm_gem_object *msm_obj;
481 list_for_each_entry(msm_obj, list, mm_list) {
482 struct drm_gem_object *obj = &msm_obj->base;
484 msm_gem_describe(obj, m);
489 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
493 void msm_gem_free_object(struct drm_gem_object *obj)
495 struct drm_device *dev = obj->dev;
496 struct msm_gem_object *msm_obj = to_msm_bo(obj);
499 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
501 /* object should not be on active list: */
502 WARN_ON(is_active(msm_obj));
504 list_del(&msm_obj->mm_list);
506 for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
507 if (msm_obj->domain[id].iova) {
508 struct msm_drm_private *priv = obj->dev->dev_private;
509 uint32_t offset = (uint32_t)mmap_offset(obj);
510 unmap_range(priv->iommus[id], offset,
511 msm_obj->sgt, obj->size);
515 drm_gem_free_mmap_offset(obj);
518 vunmap(msm_obj->vaddr);
522 if (msm_obj->resv == &msm_obj->_resv)
523 reservation_object_fini(msm_obj->resv);
525 drm_gem_object_release(obj);
530 /* convenience method to construct a GEM buffer object, and userspace handle */
531 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
532 uint32_t size, uint32_t flags, uint32_t *handle)
534 struct drm_gem_object *obj;
537 ret = mutex_lock_interruptible(&dev->struct_mutex);
541 obj = msm_gem_new(dev, size, flags);
543 mutex_unlock(&dev->struct_mutex);
548 ret = drm_gem_handle_create(file, obj, handle);
550 /* drop reference from allocate - handle holds it now */
551 drm_gem_object_unreference_unlocked(obj);
556 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
557 uint32_t size, uint32_t flags)
559 struct msm_drm_private *priv = dev->dev_private;
560 struct msm_gem_object *msm_obj;
561 struct drm_gem_object *obj = NULL;
564 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
566 size = PAGE_ALIGN(size);
568 switch (flags & MSM_BO_CACHE_MASK) {
569 case MSM_BO_UNCACHED:
574 dev_err(dev->dev, "invalid cache flag: %x\n",
575 (flags & MSM_BO_CACHE_MASK));
580 msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
586 obj = &msm_obj->base;
588 ret = drm_gem_object_init(dev, obj, size);
592 msm_obj->flags = flags;
594 msm_obj->resv = &msm_obj->_resv;
595 reservation_object_init(msm_obj->resv);
597 INIT_LIST_HEAD(&msm_obj->submit_entry);
598 INIT_LIST_HEAD(&msm_obj->inactive_work);
599 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
605 drm_gem_object_unreference_unlocked(obj);