diff options
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/omapdrm/omap_drv.h | 5 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_fb.c | 5 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_gem.c | 104 | ||||
| -rw-r--r-- | drivers/staging/omapdrm/omap_gem_dmabuf.c | 48 |
4 files changed, 151 insertions, 11 deletions
diff --git a/drivers/staging/omapdrm/omap_drv.h b/drivers/staging/omapdrm/omap_drv.h index 3586173..73a606e 100644 --- a/drivers/staging/omapdrm/omap_drv.h +++ b/drivers/staging/omapdrm/omap_drv.h @@ -138,6 +138,8 @@ int omap_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args); int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma); +int omap_gem_mmap_obj(struct drm_gem_object *obj, + struct vm_area_struct *vma); int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf); int omap_gem_op_start(struct drm_gem_object *obj, enum omap_gem_op op); int omap_gem_op_finish(struct drm_gem_object *obj, enum omap_gem_op op); @@ -145,6 +147,9 @@ int omap_gem_op_sync(struct drm_gem_object *obj, enum omap_gem_op op); int omap_gem_op_async(struct drm_gem_object *obj, enum omap_gem_op op, void (*fxn)(void *arg), void *arg); int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll); +void omap_gem_cpu_sync(struct drm_gem_object *obj, int pgoff); +void omap_gem_dma_sync(struct drm_gem_object *obj, + enum dma_data_direction dir); int omap_gem_get_paddr(struct drm_gem_object *obj, dma_addr_t *paddr, bool remap); int omap_gem_put_paddr(struct drm_gem_object *obj); diff --git a/drivers/staging/omapdrm/omap_fb.c b/drivers/staging/omapdrm/omap_fb.c index 0c53a3c..74260f0 100644 --- a/drivers/staging/omapdrm/omap_fb.c +++ b/drivers/staging/omapdrm/omap_fb.c @@ -197,8 +197,11 @@ int omap_framebuffer_replace(struct drm_framebuffer *a, pa->paddr = 0; } - if (pb && !ret) + if (pb && !ret) { ret = omap_gem_get_paddr(pb->bo, &pb->paddr, true); + if (!ret) + omap_gem_dma_sync(pb->bo, DMA_TO_DEVICE); + } } if (ret) { diff --git a/drivers/staging/omapdrm/omap_gem.c b/drivers/staging/omapdrm/omap_gem.c index c5ba334..3a0d035 100644 --- a/drivers/staging/omapdrm/omap_gem.c +++ b/drivers/staging/omapdrm/omap_gem.c @@ -207,13 +207,27 @@ static inline bool is_shmem(struct drm_gem_object *obj) return obj->filp != NULL; } +/** + * shmem buffers that are mapped cached can simulate coherency via using + * page faulting to keep track of dirty pages + */ +static inline bool is_cached_coherent(struct drm_gem_object *obj) +{ + struct omap_gem_object *omap_obj = to_omap_bo(obj); + return is_shmem(obj) && + ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED); +} + static DEFINE_SPINLOCK(sync_lock); /** ensure backing pages are allocated */ static int omap_gem_attach_pages(struct drm_gem_object *obj) { + struct drm_device *dev = obj->dev; struct omap_gem_object *omap_obj = to_omap_bo(obj); struct page **pages; + int i, npages = obj->size >> PAGE_SHIFT; + dma_addr_t *addrs; WARN_ON(omap_obj->pages); @@ -231,16 +245,18 @@ static int omap_gem_attach_pages(struct drm_gem_object *obj) * DSS, GPU, etc. are not cache coherent: */ if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) { - int i, npages = obj->size >> PAGE_SHIFT; - dma_addr_t *addrs = kmalloc(npages * sizeof(addrs), GFP_KERNEL); + addrs = kmalloc(npages * sizeof(addrs), GFP_KERNEL); for (i = 0; i < npages; i++) { - addrs[i] = dma_map_page(obj->dev->dev, pages[i], + addrs[i] = dma_map_page(dev->dev, pages[i], 0, PAGE_SIZE, DMA_BIDIRECTIONAL); } - omap_obj->addrs = addrs; + } else { + addrs = kzalloc(npages * sizeof(addrs), GFP_KERNEL); } + omap_obj->addrs = addrs; omap_obj->pages = pages; + return 0; } @@ -258,10 +274,11 @@ static void omap_gem_detach_pages(struct drm_gem_object *obj) dma_unmap_page(obj->dev->dev, omap_obj->addrs[i], PAGE_SIZE, DMA_BIDIRECTIONAL); } - kfree(omap_obj->addrs); - omap_obj->addrs = NULL; } + kfree(omap_obj->addrs); + omap_obj->addrs = NULL; + _drm_gem_put_pages(obj, omap_obj->pages, true, false); omap_obj->pages = NULL; } @@ -336,6 +353,7 @@ static int fault_1d(struct drm_gem_object *obj, vma->vm_start) >> PAGE_SHIFT; if (omap_obj->pages) { + omap_gem_cpu_sync(obj, pgoff); pfn = page_to_pfn(omap_obj->pages[pgoff]); } else { BUG_ON(!(omap_obj->flags & OMAP_BO_DMA)); @@ -510,7 +528,6 @@ fail: /** We override mainly to fix up some of the vm mapping flags.. */ int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma) { - struct omap_gem_object *omap_obj; int ret; ret = drm_gem_mmap(filp, vma); @@ -519,8 +536,13 @@ int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma) return ret; } - /* after drm_gem_mmap(), it is safe to access the obj */ - omap_obj = to_omap_bo(vma->vm_private_data); + return omap_gem_mmap_obj(vma->vm_private_data, vma); +} + +int omap_gem_mmap_obj(struct drm_gem_object *obj, + struct vm_area_struct *vma) +{ + struct omap_gem_object *omap_obj = to_omap_bo(obj); vma->vm_flags &= ~VM_PFNMAP; vma->vm_flags |= VM_MIXEDMAP; @@ -530,12 +552,31 @@ int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma) } else if (omap_obj->flags & OMAP_BO_UNCACHED) { vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags)); } else { + /* + * We do have some private objects, at least for scanout buffers + * on hardware without DMM/TILER. But these are allocated write- + * combine + */ + if (WARN_ON(!obj->filp)) + return -EINVAL; + + /* + * 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 ret; + return 0; } + /** * omap_gem_dumb_create - create a dumb buffer * @drm_file: our client file @@ -645,6 +686,48 @@ fail: return ret; } +/* Sync the buffer for CPU access.. note pages should already be + * attached, ie. omap_gem_get_pages() + */ +void omap_gem_cpu_sync(struct drm_gem_object *obj, int pgoff) +{ + struct drm_device *dev = obj->dev; + struct omap_gem_object *omap_obj = to_omap_bo(obj); + + if (is_cached_coherent(obj) && omap_obj->addrs[pgoff]) { + dma_unmap_page(dev->dev, omap_obj->addrs[pgoff], + PAGE_SIZE, DMA_BIDIRECTIONAL); + omap_obj->addrs[pgoff] = 0; + } +} + +/* sync the buffer for DMA access */ +void omap_gem_dma_sync(struct drm_gem_object *obj, + enum dma_data_direction dir) +{ + struct drm_device *dev = obj->dev; + struct omap_gem_object *omap_obj = to_omap_bo(obj); + + if (is_cached_coherent(obj)) { + int i, npages = obj->size >> PAGE_SHIFT; + struct page **pages = omap_obj->pages; + bool dirty = false; + + for (i = 0; i < npages; i++) { + if (!omap_obj->addrs[i]) { + omap_obj->addrs[i] = dma_map_page(dev->dev, pages[i], 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + dirty = true; + } + } + + if (dirty) { + unmap_mapping_range(obj->filp->f_mapping, 0, + omap_gem_mmap_size(obj), 1); + } + } +} + /* Get physical address for DMA.. if 'remap' is true, and the buffer is not * already contiguous, remap it to pin in physically contiguous memory.. (ie. * map in TILER) @@ -709,6 +792,7 @@ int omap_gem_get_paddr(struct drm_gem_object *obj, *paddr = omap_obj->paddr; } else { ret = -EINVAL; + goto fail; } fail: diff --git a/drivers/staging/omapdrm/omap_gem_dmabuf.c b/drivers/staging/omapdrm/omap_gem_dmabuf.c index 2fa39e8..aba4b34 100644 --- a/drivers/staging/omapdrm/omap_gem_dmabuf.c +++ b/drivers/staging/omapdrm/omap_gem_dmabuf.c @@ -50,6 +50,9 @@ static struct sg_table *omap_gem_map_dma_buf( sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(paddr)), obj->size, 0); sg_dma_address(sg->sgl) = paddr; + /* this should be after _get_paddr() to ensure we have pages attached */ + omap_gem_dma_sync(obj, dir); + out: if (ret) return ERR_PTR(ret); @@ -104,6 +107,7 @@ static void *omap_gem_dmabuf_kmap_atomic(struct dma_buf *buffer, struct drm_gem_object *obj = buffer->priv; struct page **pages; omap_gem_get_pages(obj, &pages, false); + omap_gem_cpu_sync(obj, page_num); return kmap_atomic(pages[page_num]); } @@ -119,6 +123,7 @@ static void *omap_gem_dmabuf_kmap(struct dma_buf *buffer, struct drm_gem_object *obj = buffer->priv; struct page **pages; omap_gem_get_pages(obj, &pages, false); + omap_gem_cpu_sync(obj, page_num); return kmap(pages[page_num]); } @@ -131,6 +136,48 @@ static void omap_gem_dmabuf_kunmap(struct dma_buf *buffer, kunmap(pages[page_num]); } +/* + * TODO maybe we can split up drm_gem_mmap to avoid duplicating + * some here.. or at least have a drm_dmabuf_mmap helper. + */ +static int omap_gem_dmabuf_mmap(struct dma_buf *buffer, + struct vm_area_struct *vma) +{ + struct drm_gem_object *obj = buffer->priv; + int ret = 0; + + if (WARN_ON(!obj->filp)) + return -EINVAL; + + /* Check for valid size. */ + if (omap_gem_mmap_size(obj) < vma->vm_end - vma->vm_start) { + ret = -EINVAL; + goto out_unlock; + } + + if (!obj->dev->driver->gem_vm_ops) { + ret = -EINVAL; + goto out_unlock; + } + + vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND; + vma->vm_ops = obj->dev->driver->gem_vm_ops; + vma->vm_private_data = obj; + vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); + + /* Take a ref for this mapping of the object, so that the fault + * handler can dereference the mmap offset's pointer to the object. + * This reference is cleaned up by the corresponding vm_close + * (which should happen whether the vma was created by this call, or + * by a vm_open due to mremap or partial unmap or whatever). + */ + vma->vm_ops->open(vma); + +out_unlock: + + return omap_gem_mmap_obj(obj, vma); +} + struct dma_buf_ops omap_dmabuf_ops = { .map_dma_buf = omap_gem_map_dma_buf, .unmap_dma_buf = omap_gem_unmap_dma_buf, @@ -141,6 +188,7 @@ struct dma_buf_ops omap_dmabuf_ops = { .kunmap_atomic = omap_gem_dmabuf_kunmap_atomic, .kmap = omap_gem_dmabuf_kmap, .kunmap = omap_gem_dmabuf_kunmap, + .mmap = omap_gem_dmabuf_mmap, }; struct dma_buf * omap_gem_prime_export(struct drm_device *dev, |
