diff options
Diffstat (limited to 'drivers/gpu/drm/msm/msm_gem.c')
| -rw-r--r-- | drivers/gpu/drm/msm/msm_gem.c | 597 |
1 files changed, 597 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c new file mode 100644 index 000000000000..6b5a6c8c7658 --- /dev/null +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -0,0 +1,597 @@ +/* + * Copyright (C) 2013 Red Hat + * Author: Rob Clark <robdclark@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/spinlock.h> +#include <linux/shmem_fs.h> + +#include "msm_drv.h" +#include "msm_gem.h" +#include "msm_gpu.h" + + +/* called with dev->struct_mutex held */ +static struct page **get_pages(struct drm_gem_object *obj) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + if (!msm_obj->pages) { + struct drm_device *dev = obj->dev; + struct page **p = drm_gem_get_pages(obj, 0); + int npages = obj->size >> PAGE_SHIFT; + + if (IS_ERR(p)) { + dev_err(dev->dev, "could not get pages: %ld\n", + PTR_ERR(p)); + return p; + } + + msm_obj->sgt = drm_prime_pages_to_sg(p, npages); + if (!msm_obj->sgt) { + dev_err(dev->dev, "failed to allocate sgt\n"); + return ERR_PTR(-ENOMEM); + } + + msm_obj->pages = p; + + /* For non-cached buffers, ensure the new pages are clean + * because display controller, GPU, etc. are not coherent: + */ + if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) + dma_map_sg(dev->dev, msm_obj->sgt->sgl, + msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + } + + return msm_obj->pages; +} + +static void put_pages(struct drm_gem_object *obj) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + if (msm_obj->pages) { + /* For non-cached buffers, ensure the new pages are clean + * because display controller, GPU, etc. are not coherent: + */ + if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) + dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl, + msm_obj->sgt->nents, DMA_BIDIRECTIONAL); + sg_free_table(msm_obj->sgt); + kfree(msm_obj->sgt); + + drm_gem_put_pages(obj, msm_obj->pages, true, false); + msm_obj->pages = NULL; + } +} + +int msm_gem_mmap_obj(struct drm_gem_object *obj, + struct vm_area_struct *vma) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + vma->vm_flags &= ~VM_PFNMAP; + vma->vm_flags |= VM_MIXEDMAP; + + if (msm_obj->flags & MSM_BO_WC) { + vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); + } else if (msm_obj->flags & MSM_BO_UNCACHED) { + vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags)); + } else { + /* + * Shunt off cached objs to shmem file so they have their own + * address_space (so unmap_mapping_range does what we want, + * in particular in the case of mmap'd dmabufs) + */ + fput(vma->vm_file); + get_file(obj->filp); + vma->vm_pgoff = 0; + vma->vm_file = obj->filp; + + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); + } + + return 0; +} + +int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma) +{ + int ret; + + ret = drm_gem_mmap(filp, vma); + if (ret) { + DBG("mmap failed: %d", ret); + return ret; + } + + return msm_gem_mmap_obj(vma->vm_private_data, vma); +} + +int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +{ + struct drm_gem_object *obj = vma->vm_private_data; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + struct drm_device *dev = obj->dev; + struct page **pages; + unsigned long pfn; + pgoff_t pgoff; + int ret; + + /* Make sure we don't parallel update on a fault, nor move or remove + * something from beneath our feet + */ + ret = mutex_lock_interruptible(&dev->struct_mutex); + if (ret) + goto out; + + /* make sure we have pages attached now */ + pages = get_pages(obj); + if (IS_ERR(pages)) { + ret = PTR_ERR(pages); + goto out_unlock; + } + + /* We don't use vmf->pgoff since that has the fake offset: */ + pgoff = ((unsigned long)vmf->virtual_address - + vma->vm_start) >> PAGE_SHIFT; + + pfn = page_to_pfn(msm_obj->pages[pgoff]); + + VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, + pfn, pfn << PAGE_SHIFT); + + ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn); + +out_unlock: + mutex_unlock(&dev->struct_mutex); +out: + switch (ret) { + case -EAGAIN: + set_need_resched(); + case 0: + case -ERESTARTSYS: + case -EINTR: + return VM_FAULT_NOPAGE; + case -ENOMEM: + return VM_FAULT_OOM; + default: + return VM_FAULT_SIGBUS; + } +} + +/** get mmap offset */ +static uint64_t mmap_offset(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + int ret; + + WARN_ON(!mutex_is_locked(&dev->struct_mutex)); + + /* Make it mmapable */ + ret = drm_gem_create_mmap_offset(obj); + + if (ret) { + dev_err(dev->dev, "could not allocate mmap offset\n"); + return 0; + } + + return drm_vma_node_offset_addr(&obj->vma_node); +} + +uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj) +{ + uint64_t offset; + mutex_lock(&obj->dev->struct_mutex); + offset = mmap_offset(obj); + mutex_unlock(&obj->dev->struct_mutex); + return offset; +} + +/* helpers for dealing w/ iommu: */ +static int map_range(struct iommu_domain *domain, unsigned int iova, + struct sg_table *sgt, unsigned int len, int prot) +{ + struct scatterlist *sg; + unsigned int da = iova; + unsigned int i, j; + int ret; + + if (!domain || !sgt) + return -EINVAL; + + for_each_sg(sgt->sgl, sg, sgt->nents, i) { + u32 pa = sg_phys(sg) - sg->offset; + size_t bytes = sg->length + sg->offset; + + VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes); + + ret = iommu_map(domain, da, pa, bytes, prot); + if (ret) + goto fail; + + da += bytes; + } + + return 0; + +fail: + da = iova; + + for_each_sg(sgt->sgl, sg, i, j) { + size_t bytes = sg->length + sg->offset; + iommu_unmap(domain, da, bytes); + da += bytes; + } + return ret; +} + +static void unmap_range(struct iommu_domain *domain, unsigned int iova, + struct sg_table *sgt, unsigned int len) +{ + struct scatterlist *sg; + unsigned int da = iova; + int i; + + for_each_sg(sgt->sgl, sg, sgt->nents, i) { + size_t bytes = sg->length + sg->offset; + size_t unmapped; + + unmapped = iommu_unmap(domain, da, bytes); + if (unmapped < bytes) + break; + + VERB("unmap[%d]: %08x(%x)", i, iova, bytes); + + BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE)); + + da += bytes; + } +} + +/* should be called under struct_mutex.. although it can be called + * from atomic context without struct_mutex to acquire an extra + * iova ref if you know one is already held. + * + * That means when I do eventually need to add support for unpinning + * the refcnt counter needs to be atomic_t. + */ +int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id, + uint32_t *iova) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + int ret = 0; + + if (!msm_obj->domain[id].iova) { + struct msm_drm_private *priv = obj->dev->dev_private; + uint32_t offset = (uint32_t)mmap_offset(obj); + struct page **pages; + pages = get_pages(obj); + if (IS_ERR(pages)) + return PTR_ERR(pages); + // XXX ideally we would not map buffers writable when not needed... + ret = map_range(priv->iommus[id], offset, msm_obj->sgt, + obj->size, IOMMU_READ | IOMMU_WRITE); + msm_obj->domain[id].iova = offset; + } + + if (!ret) + *iova = msm_obj->domain[id].iova; + + return ret; +} + +int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova) +{ + int ret; + mutex_lock(&obj->dev->struct_mutex); + ret = msm_gem_get_iova_locked(obj, id, iova); + mutex_unlock(&obj->dev->struct_mutex); + return ret; +} + +void msm_gem_put_iova(struct drm_gem_object *obj, int id) +{ + // XXX TODO .. + // NOTE: probably don't need a _locked() version.. we wouldn't + // normally unmap here, but instead just mark that it could be + // unmapped (if the iova refcnt drops to zero), but then later + // if another _get_iova_locked() fails we can start unmapping + // things that are no longer needed.. +} + +int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev, + struct drm_mode_create_dumb *args) +{ + args->pitch = align_pitch(args->width, args->bpp); + args->size = PAGE_ALIGN(args->pitch * args->height); + return msm_gem_new_handle(dev, file, args->size, + MSM_BO_SCANOUT | MSM_BO_WC, &args->handle); +} + +int msm_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, + uint32_t handle) +{ + /* No special work needed, drop the reference and see what falls out */ + return drm_gem_handle_delete(file, handle); +} + +int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, + uint32_t handle, uint64_t *offset) +{ + struct drm_gem_object *obj; + int ret = 0; + + /* GEM does all our handle to object mapping */ + obj = drm_gem_object_lookup(dev, file, handle); + if (obj == NULL) { + ret = -ENOENT; + goto fail; + } + + *offset = msm_gem_mmap_offset(obj); + + drm_gem_object_unreference_unlocked(obj); + +fail: + return ret; +} + +void *msm_gem_vaddr_locked(struct drm_gem_object *obj) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); + if (!msm_obj->vaddr) { + struct page **pages = get_pages(obj); + if (IS_ERR(pages)) + return ERR_CAST(pages); + msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT, + VM_MAP, pgprot_writecombine(PAGE_KERNEL)); + } + return msm_obj->vaddr; +} + +void *msm_gem_vaddr(struct drm_gem_object *obj) +{ + void *ret; + mutex_lock(&obj->dev->struct_mutex); + ret = msm_gem_vaddr_locked(obj); + mutex_unlock(&obj->dev->struct_mutex); + return ret; +} + +int msm_gem_queue_inactive_work(struct drm_gem_object *obj, + struct work_struct *work) +{ + struct drm_device *dev = obj->dev; + struct msm_drm_private *priv = dev->dev_private; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + int ret = 0; + + mutex_lock(&dev->struct_mutex); + if (!list_empty(&work->entry)) { + ret = -EINVAL; + } else if (is_active(msm_obj)) { + list_add_tail(&work->entry, &msm_obj->inactive_work); + } else { + queue_work(priv->wq, work); + } + mutex_unlock(&dev->struct_mutex); + + return ret; +} + +void msm_gem_move_to_active(struct drm_gem_object *obj, + struct msm_gpu *gpu, uint32_t fence) +{ + struct msm_gem_object *msm_obj = to_msm_bo(obj); + msm_obj->gpu = gpu; + msm_obj->fence = fence; + list_del_init(&msm_obj->mm_list); + list_add_tail(&msm_obj->mm_list, &gpu->active_list); +} + +void msm_gem_move_to_inactive(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + struct msm_drm_private *priv = dev->dev_private; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + + WARN_ON(!mutex_is_locked(&dev->struct_mutex)); + + msm_obj->gpu = NULL; + msm_obj->fence = 0; + list_del_init(&msm_obj->mm_list); + list_add_tail(&msm_obj->mm_list, &priv->inactive_list); + + while (!list_empty(&msm_obj->inactive_work)) { + struct work_struct *work; + + work = list_first_entry(&msm_obj->inactive_work, + struct work_struct, entry); + + list_del_init(&work->entry); + queue_work(priv->wq, work); + } +} + +int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, + struct timespec *timeout) +{ + struct drm_device *dev = obj->dev; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + int ret = 0; + + if (is_active(msm_obj) && !(op & MSM_PREP_NOSYNC)) + ret = msm_wait_fence_interruptable(dev, msm_obj->fence, timeout); + + /* TODO cache maintenance */ + + return ret; +} + +int msm_gem_cpu_fini(struct drm_gem_object *obj) +{ + /* TODO cache maintenance */ + return 0; +} + +#ifdef CONFIG_DEBUG_FS +void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m) +{ + struct drm_device *dev = obj->dev; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + uint64_t off = drm_vma_node_start(&obj->vma_node); + + WARN_ON(!mutex_is_locked(&dev->struct_mutex)); + seq_printf(m, "%08x: %c(%d) %2d (%2d) %08llx %p %d\n", + msm_obj->flags, is_active(msm_obj) ? 'A' : 'I', + msm_obj->fence, obj->name, obj->refcount.refcount.counter, + off, msm_obj->vaddr, obj->size); +} + +void msm_gem_describe_objects(struct list_head *list, struct seq_file *m) +{ + struct msm_gem_object *msm_obj; + int count = 0; + size_t size = 0; + + list_for_each_entry(msm_obj, list, mm_list) { + struct drm_gem_object *obj = &msm_obj->base; + seq_printf(m, " "); + msm_gem_describe(obj, m); + count++; + size += obj->size; + } + + seq_printf(m, "Total %d objects, %zu bytes\n", count, size); +} +#endif + +void msm_gem_free_object(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + struct msm_gem_object *msm_obj = to_msm_bo(obj); + int id; + + WARN_ON(!mutex_is_locked(&dev->struct_mutex)); + + /* object should not be on active list: */ + WARN_ON(is_active(msm_obj)); + + list_del(&msm_obj->mm_list); + + for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) { + if (msm_obj->domain[id].iova) { + struct msm_drm_private *priv = obj->dev->dev_private; + uint32_t offset = (uint32_t)mmap_offset(obj); + unmap_range(priv->iommus[id], offset, + msm_obj->sgt, obj->size); + } + } + + drm_gem_free_mmap_offset(obj); + + if (msm_obj->vaddr) + vunmap(msm_obj->vaddr); + + put_pages(obj); + + if (msm_obj->resv == &msm_obj->_resv) + reservation_object_fini(msm_obj->resv); + + drm_gem_object_release(obj); + + kfree(msm_obj); +} + +/* convenience method to construct a GEM buffer object, and userspace handle */ +int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file, + uint32_t size, uint32_t flags, uint32_t *handle) +{ + struct drm_gem_object *obj; + int ret; + + ret = mutex_lock_interruptible(&dev->struct_mutex); + if (ret) + return ret; + + obj = msm_gem_new(dev, size, flags); + + mutex_unlock(&dev->struct_mutex); + + if (IS_ERR(obj)) + return PTR_ERR(obj); + + ret = drm_gem_handle_create(file, obj, handle); + + /* drop reference from allocate - handle holds it now */ + drm_gem_object_unreference_unlocked(obj); + + return ret; +} + +struct drm_gem_object *msm_gem_new(struct drm_device *dev, + uint32_t size, uint32_t flags) +{ + struct msm_drm_private *priv = dev->dev_private; + struct msm_gem_object *msm_obj; + struct drm_gem_object *obj = NULL; + int ret; + + WARN_ON(!mutex_is_locked(&dev->struct_mutex)); + + size = PAGE_ALIGN(size); + + switch (flags & MSM_BO_CACHE_MASK) { + case MSM_BO_UNCACHED: + case MSM_BO_CACHED: + case MSM_BO_WC: + break; + default: + dev_err(dev->dev, "invalid cache flag: %x\n", + (flags & MSM_BO_CACHE_MASK)); + ret = -EINVAL; + goto fail; + } + + msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL); + if (!msm_obj) { + ret = -ENOMEM; + goto fail; + } + + obj = &msm_obj->base; + + ret = drm_gem_object_init(dev, obj, size); + if (ret) + goto fail; + + msm_obj->flags = flags; + + msm_obj->resv = &msm_obj->_resv; + reservation_object_init(msm_obj->resv); + + INIT_LIST_HEAD(&msm_obj->submit_entry); + INIT_LIST_HEAD(&msm_obj->inactive_work); + list_add_tail(&msm_obj->mm_list, &priv->inactive_list); + + return obj; + +fail: + if (obj) + drm_gem_object_unreference_unlocked(obj); + + return ERR_PTR(ret); +} |