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>
20 #include <linux/dma-buf.h>
27 static dma_addr_t physaddr(struct drm_gem_object *obj)
29 struct msm_gem_object *msm_obj = to_msm_bo(obj);
30 struct msm_drm_private *priv = obj->dev->dev_private;
31 return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
35 /* allocate pages from VRAM carveout, used when no IOMMU: */
36 static struct page **get_pages_vram(struct drm_gem_object *obj,
39 struct msm_gem_object *msm_obj = to_msm_bo(obj);
40 struct msm_drm_private *priv = obj->dev->dev_private;
45 p = drm_malloc_ab(npages, sizeof(struct page *));
47 return ERR_PTR(-ENOMEM);
49 ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
50 npages, 0, DRM_MM_SEARCH_DEFAULT);
56 paddr = physaddr(obj);
57 for (i = 0; i < npages; i++) {
58 p[i] = phys_to_page(paddr);
65 /* called with dev->struct_mutex held */
66 static struct page **get_pages(struct drm_gem_object *obj)
68 struct msm_gem_object *msm_obj = to_msm_bo(obj);
70 if (!msm_obj->pages) {
71 struct drm_device *dev = obj->dev;
73 int npages = obj->size >> PAGE_SHIFT;
75 if (iommu_present(&platform_bus_type))
76 p = drm_gem_get_pages(obj, 0);
78 p = get_pages_vram(obj, npages);
81 dev_err(dev->dev, "could not get pages: %ld\n",
86 msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
87 if (IS_ERR(msm_obj->sgt)) {
88 dev_err(dev->dev, "failed to allocate sgt\n");
89 return ERR_CAST(msm_obj->sgt);
94 /* For non-cached buffers, ensure the new pages are clean
95 * because display controller, GPU, etc. are not coherent:
97 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
98 dma_map_sg(dev->dev, msm_obj->sgt->sgl,
99 msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
102 return msm_obj->pages;
105 static void put_pages(struct drm_gem_object *obj)
107 struct msm_gem_object *msm_obj = to_msm_bo(obj);
109 if (msm_obj->pages) {
110 /* For non-cached buffers, ensure the new pages are clean
111 * because display controller, GPU, etc. are not coherent:
113 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
114 dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
115 msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
116 sg_free_table(msm_obj->sgt);
119 if (iommu_present(&platform_bus_type))
120 drm_gem_put_pages(obj, msm_obj->pages, true, false);
122 drm_mm_remove_node(msm_obj->vram_node);
124 msm_obj->pages = NULL;
128 struct page **msm_gem_get_pages(struct drm_gem_object *obj)
130 struct drm_device *dev = obj->dev;
132 mutex_lock(&dev->struct_mutex);
134 mutex_unlock(&dev->struct_mutex);
138 void msm_gem_put_pages(struct drm_gem_object *obj)
140 /* when we start tracking the pin count, then do something here */
143 int msm_gem_mmap_obj(struct drm_gem_object *obj,
144 struct vm_area_struct *vma)
146 struct msm_gem_object *msm_obj = to_msm_bo(obj);
148 vma->vm_flags &= ~VM_PFNMAP;
149 vma->vm_flags |= VM_MIXEDMAP;
151 if (msm_obj->flags & MSM_BO_WC) {
152 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
153 } else if (msm_obj->flags & MSM_BO_UNCACHED) {
154 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
157 * Shunt off cached objs to shmem file so they have their own
158 * address_space (so unmap_mapping_range does what we want,
159 * in particular in the case of mmap'd dmabufs)
164 vma->vm_file = obj->filp;
166 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
172 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
176 ret = drm_gem_mmap(filp, vma);
178 DBG("mmap failed: %d", ret);
182 return msm_gem_mmap_obj(vma->vm_private_data, vma);
185 int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
187 struct drm_gem_object *obj = vma->vm_private_data;
188 struct drm_device *dev = obj->dev;
194 /* Make sure we don't parallel update on a fault, nor move or remove
195 * something from beneath our feet
197 ret = mutex_lock_interruptible(&dev->struct_mutex);
201 /* make sure we have pages attached now */
202 pages = get_pages(obj);
204 ret = PTR_ERR(pages);
208 /* We don't use vmf->pgoff since that has the fake offset: */
209 pgoff = ((unsigned long)vmf->virtual_address -
210 vma->vm_start) >> PAGE_SHIFT;
212 pfn = page_to_pfn(pages[pgoff]);
214 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
215 pfn, pfn << PAGE_SHIFT);
217 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
220 mutex_unlock(&dev->struct_mutex);
229 * EBUSY is ok: this just means that another thread
230 * already did the job.
232 return VM_FAULT_NOPAGE;
236 return VM_FAULT_SIGBUS;
240 /** get mmap offset */
241 static uint64_t mmap_offset(struct drm_gem_object *obj)
243 struct drm_device *dev = obj->dev;
246 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
248 /* Make it mmapable */
249 ret = drm_gem_create_mmap_offset(obj);
252 dev_err(dev->dev, "could not allocate mmap offset\n");
256 return drm_vma_node_offset_addr(&obj->vma_node);
259 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
262 mutex_lock(&obj->dev->struct_mutex);
263 offset = mmap_offset(obj);
264 mutex_unlock(&obj->dev->struct_mutex);
268 /* should be called under struct_mutex.. although it can be called
269 * from atomic context without struct_mutex to acquire an extra
270 * iova ref if you know one is already held.
272 * That means when I do eventually need to add support for unpinning
273 * the refcnt counter needs to be atomic_t.
275 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
278 struct msm_gem_object *msm_obj = to_msm_bo(obj);
281 if (!msm_obj->domain[id].iova) {
282 struct msm_drm_private *priv = obj->dev->dev_private;
283 struct msm_mmu *mmu = priv->mmus[id];
284 struct page **pages = get_pages(obj);
287 return PTR_ERR(pages);
289 if (iommu_present(&platform_bus_type)) {
290 uint32_t offset = (uint32_t)mmap_offset(obj);
291 ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
292 obj->size, IOMMU_READ | IOMMU_WRITE);
293 msm_obj->domain[id].iova = offset;
295 msm_obj->domain[id].iova = physaddr(obj);
300 *iova = msm_obj->domain[id].iova;
305 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
307 struct msm_gem_object *msm_obj = to_msm_bo(obj);
310 /* this is safe right now because we don't unmap until the
313 if (msm_obj->domain[id].iova) {
314 *iova = msm_obj->domain[id].iova;
318 mutex_lock(&obj->dev->struct_mutex);
319 ret = msm_gem_get_iova_locked(obj, id, iova);
320 mutex_unlock(&obj->dev->struct_mutex);
324 void msm_gem_put_iova(struct drm_gem_object *obj, int id)
327 // NOTE: probably don't need a _locked() version.. we wouldn't
328 // normally unmap here, but instead just mark that it could be
329 // unmapped (if the iova refcnt drops to zero), but then later
330 // if another _get_iova_locked() fails we can start unmapping
331 // things that are no longer needed..
334 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
335 struct drm_mode_create_dumb *args)
337 args->pitch = align_pitch(args->width, args->bpp);
338 args->size = PAGE_ALIGN(args->pitch * args->height);
339 return msm_gem_new_handle(dev, file, args->size,
340 MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
343 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
344 uint32_t handle, uint64_t *offset)
346 struct drm_gem_object *obj;
349 /* GEM does all our handle to object mapping */
350 obj = drm_gem_object_lookup(dev, file, handle);
356 *offset = msm_gem_mmap_offset(obj);
358 drm_gem_object_unreference_unlocked(obj);
364 void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
366 struct msm_gem_object *msm_obj = to_msm_bo(obj);
367 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
368 if (!msm_obj->vaddr) {
369 struct page **pages = get_pages(obj);
371 return ERR_CAST(pages);
372 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
373 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
375 return msm_obj->vaddr;
378 void *msm_gem_vaddr(struct drm_gem_object *obj)
381 mutex_lock(&obj->dev->struct_mutex);
382 ret = msm_gem_vaddr_locked(obj);
383 mutex_unlock(&obj->dev->struct_mutex);
387 /* setup callback for when bo is no longer busy..
388 * TODO probably want to differentiate read vs write..
390 int msm_gem_queue_inactive_cb(struct drm_gem_object *obj,
391 struct msm_fence_cb *cb)
393 struct drm_device *dev = obj->dev;
394 struct msm_drm_private *priv = dev->dev_private;
395 struct msm_gem_object *msm_obj = to_msm_bo(obj);
398 mutex_lock(&dev->struct_mutex);
399 if (!list_empty(&cb->work.entry)) {
401 } else if (is_active(msm_obj)) {
402 cb->fence = max(msm_obj->read_fence, msm_obj->write_fence);
403 list_add_tail(&cb->work.entry, &priv->fence_cbs);
405 queue_work(priv->wq, &cb->work);
407 mutex_unlock(&dev->struct_mutex);
412 void msm_gem_move_to_active(struct drm_gem_object *obj,
413 struct msm_gpu *gpu, bool write, uint32_t fence)
415 struct msm_gem_object *msm_obj = to_msm_bo(obj);
418 msm_obj->write_fence = fence;
420 msm_obj->read_fence = fence;
421 list_del_init(&msm_obj->mm_list);
422 list_add_tail(&msm_obj->mm_list, &gpu->active_list);
425 void msm_gem_move_to_inactive(struct drm_gem_object *obj)
427 struct drm_device *dev = obj->dev;
428 struct msm_drm_private *priv = dev->dev_private;
429 struct msm_gem_object *msm_obj = to_msm_bo(obj);
431 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
434 msm_obj->read_fence = 0;
435 msm_obj->write_fence = 0;
436 list_del_init(&msm_obj->mm_list);
437 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
440 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op,
441 struct timespec *timeout)
443 struct drm_device *dev = obj->dev;
444 struct msm_gem_object *msm_obj = to_msm_bo(obj);
447 if (is_active(msm_obj)) {
450 if (op & MSM_PREP_READ)
451 fence = msm_obj->write_fence;
452 if (op & MSM_PREP_WRITE)
453 fence = max(fence, msm_obj->read_fence);
454 if (op & MSM_PREP_NOSYNC)
457 ret = msm_wait_fence_interruptable(dev, fence, timeout);
460 /* TODO cache maintenance */
465 int msm_gem_cpu_fini(struct drm_gem_object *obj)
467 /* TODO cache maintenance */
471 #ifdef CONFIG_DEBUG_FS
472 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
474 struct drm_device *dev = obj->dev;
475 struct msm_gem_object *msm_obj = to_msm_bo(obj);
476 uint64_t off = drm_vma_node_start(&obj->vma_node);
478 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
479 seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %d\n",
480 msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
481 msm_obj->read_fence, msm_obj->write_fence,
482 obj->name, obj->refcount.refcount.counter,
483 off, msm_obj->vaddr, obj->size);
486 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
488 struct msm_gem_object *msm_obj;
492 list_for_each_entry(msm_obj, list, mm_list) {
493 struct drm_gem_object *obj = &msm_obj->base;
495 msm_gem_describe(obj, m);
500 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
504 void msm_gem_free_object(struct drm_gem_object *obj)
506 struct drm_device *dev = obj->dev;
507 struct msm_drm_private *priv = obj->dev->dev_private;
508 struct msm_gem_object *msm_obj = to_msm_bo(obj);
511 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
513 /* object should not be on active list: */
514 WARN_ON(is_active(msm_obj));
516 list_del(&msm_obj->mm_list);
518 for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
519 struct msm_mmu *mmu = priv->mmus[id];
520 if (mmu && msm_obj->domain[id].iova) {
521 uint32_t offset = (uint32_t)mmap_offset(obj);
522 mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
526 drm_gem_free_mmap_offset(obj);
528 if (obj->import_attach) {
530 dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
532 /* Don't drop the pages for imported dmabuf, as they are not
533 * ours, just free the array we allocated:
536 drm_free_large(msm_obj->pages);
540 vunmap(msm_obj->vaddr);
544 if (msm_obj->resv == &msm_obj->_resv)
545 reservation_object_fini(msm_obj->resv);
547 drm_gem_object_release(obj);
552 /* convenience method to construct a GEM buffer object, and userspace handle */
553 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
554 uint32_t size, uint32_t flags, uint32_t *handle)
556 struct drm_gem_object *obj;
559 ret = mutex_lock_interruptible(&dev->struct_mutex);
563 obj = msm_gem_new(dev, size, flags);
565 mutex_unlock(&dev->struct_mutex);
570 ret = drm_gem_handle_create(file, obj, handle);
572 /* drop reference from allocate - handle holds it now */
573 drm_gem_object_unreference_unlocked(obj);
578 static int msm_gem_new_impl(struct drm_device *dev,
579 uint32_t size, uint32_t flags,
580 struct drm_gem_object **obj)
582 struct msm_drm_private *priv = dev->dev_private;
583 struct msm_gem_object *msm_obj;
586 switch (flags & MSM_BO_CACHE_MASK) {
587 case MSM_BO_UNCACHED:
592 dev_err(dev->dev, "invalid cache flag: %x\n",
593 (flags & MSM_BO_CACHE_MASK));
597 sz = sizeof(*msm_obj);
598 if (!iommu_present(&platform_bus_type))
599 sz += sizeof(struct drm_mm_node);
601 msm_obj = kzalloc(sz, GFP_KERNEL);
605 if (!iommu_present(&platform_bus_type))
606 msm_obj->vram_node = (void *)&msm_obj[1];
608 msm_obj->flags = flags;
610 msm_obj->resv = &msm_obj->_resv;
611 reservation_object_init(msm_obj->resv);
613 INIT_LIST_HEAD(&msm_obj->submit_entry);
614 list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
616 *obj = &msm_obj->base;
621 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
622 uint32_t size, uint32_t flags)
624 struct drm_gem_object *obj = NULL;
627 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
629 size = PAGE_ALIGN(size);
631 ret = msm_gem_new_impl(dev, size, flags, &obj);
635 if (iommu_present(&platform_bus_type)) {
636 ret = drm_gem_object_init(dev, obj, size);
640 drm_gem_private_object_init(dev, obj, size);
647 drm_gem_object_unreference_unlocked(obj);
652 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
653 uint32_t size, struct sg_table *sgt)
655 struct msm_gem_object *msm_obj;
656 struct drm_gem_object *obj;
659 /* if we don't have IOMMU, don't bother pretending we can import: */
660 if (!iommu_present(&platform_bus_type)) {
661 dev_err(dev->dev, "cannot import without IOMMU\n");
662 return ERR_PTR(-EINVAL);
665 size = PAGE_ALIGN(size);
667 ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
671 drm_gem_private_object_init(dev, obj, size);
673 npages = size / PAGE_SIZE;
675 msm_obj = to_msm_bo(obj);
677 msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
678 if (!msm_obj->pages) {
683 ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
691 drm_gem_object_unreference_unlocked(obj);