| /* |
| * drivers/gpu/drm/omapdrm/omap_gem.c |
| * |
| * Copyright (C) 2011 Texas Instruments |
| * Author: Rob Clark <rob.clark@linaro.org> |
| * |
| * 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/seq_file.h> |
| #include <linux/shmem_fs.h> |
| #include <linux/spinlock.h> |
| #include <linux/pfn_t.h> |
| |
| #include <drm/drm_vma_manager.h> |
| |
| #include "omap_drv.h" |
| #include "omap_dmm_tiler.h" |
| |
| /* |
| * GEM buffer object implementation. |
| */ |
| |
| /* note: we use upper 8 bits of flags for driver-internal flags: */ |
| #define OMAP_BO_MEM_DMA_API 0x01000000 /* memory allocated with the dma_alloc_* API */ |
| #define OMAP_BO_MEM_SHMEM 0x02000000 /* memory allocated through shmem backing */ |
| #define OMAP_BO_MEM_DMABUF 0x08000000 /* memory imported from a dmabuf */ |
| |
| struct omap_gem_object { |
| struct drm_gem_object base; |
| |
| struct list_head mm_list; |
| |
| uint32_t flags; |
| |
| /** width/height for tiled formats (rounded up to slot boundaries) */ |
| uint16_t width, height; |
| |
| /** roll applied when mapping to DMM */ |
| uint32_t roll; |
| |
| /** |
| * paddr contains the buffer DMA address. It is valid for |
| * |
| * - buffers allocated through the DMA mapping API (with the |
| * OMAP_BO_MEM_DMA_API flag set) |
| * |
| * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set) |
| * if they are physically contiguous (when sgt->orig_nents == 1) |
| * |
| * - buffers mapped through the TILER when paddr_cnt is not zero, in |
| * which case the DMA address points to the TILER aperture |
| * |
| * Physically contiguous buffers have their DMA address equal to the |
| * physical address as we don't remap those buffers through the TILER. |
| * |
| * Buffers mapped to the TILER have their DMA address pointing to the |
| * TILER aperture. As TILER mappings are refcounted (through paddr_cnt) |
| * the DMA address must be accessed through omap_get_get_paddr() to |
| * ensure that the mapping won't disappear unexpectedly. References must |
| * be released with omap_gem_put_paddr(). |
| */ |
| dma_addr_t paddr; |
| |
| /** |
| * # of users of paddr |
| */ |
| uint32_t paddr_cnt; |
| |
| /** |
| * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag |
| * is set and the sgt field is valid. |
| */ |
| struct sg_table *sgt; |
| |
| /** |
| * tiler block used when buffer is remapped in DMM/TILER. |
| */ |
| struct tiler_block *block; |
| |
| /** |
| * Array of backing pages, if allocated. Note that pages are never |
| * allocated for buffers originally allocated from contiguous memory |
| */ |
| struct page **pages; |
| |
| /** addresses corresponding to pages in above array */ |
| dma_addr_t *addrs; |
| |
| /** |
| * Virtual address, if mapped. |
| */ |
| void *vaddr; |
| |
| /** |
| * sync-object allocated on demand (if needed) |
| * |
| * Per-buffer sync-object for tracking pending and completed hw/dma |
| * read and write operations. |
| */ |
| struct { |
| uint32_t write_pending; |
| uint32_t write_complete; |
| uint32_t read_pending; |
| uint32_t read_complete; |
| } *sync; |
| }; |
| |
| #define to_omap_bo(x) container_of(x, struct omap_gem_object, base) |
| |
| /* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are |
| * not necessarily pinned in TILER all the time, and (b) when they are |
| * they are not necessarily page aligned, we reserve one or more small |
| * regions in each of the 2d containers to use as a user-GART where we |
| * can create a second page-aligned mapping of parts of the buffer |
| * being accessed from userspace. |
| * |
| * Note that we could optimize slightly when we know that multiple |
| * tiler containers are backed by the same PAT.. but I'll leave that |
| * for later.. |
| */ |
| #define NUM_USERGART_ENTRIES 2 |
| struct omap_drm_usergart_entry { |
| struct tiler_block *block; /* the reserved tiler block */ |
| dma_addr_t paddr; |
| struct drm_gem_object *obj; /* the current pinned obj */ |
| pgoff_t obj_pgoff; /* page offset of obj currently |
| mapped in */ |
| }; |
| |
| struct omap_drm_usergart { |
| struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES]; |
| int height; /* height in rows */ |
| int height_shift; /* ilog2(height in rows) */ |
| int slot_shift; /* ilog2(width per slot) */ |
| int stride_pfn; /* stride in pages */ |
| int last; /* index of last used entry */ |
| }; |
| |
| /* ----------------------------------------------------------------------------- |
| * Helpers |
| */ |
| |
| /** get mmap offset */ |
| static uint64_t mmap_offset(struct drm_gem_object *obj) |
| { |
| struct drm_device *dev = obj->dev; |
| int ret; |
| size_t size; |
| |
| WARN_ON(!mutex_is_locked(&dev->struct_mutex)); |
| |
| /* Make it mmapable */ |
| size = omap_gem_mmap_size(obj); |
| ret = drm_gem_create_mmap_offset_size(obj, size); |
| if (ret) { |
| dev_err(dev->dev, "could not allocate mmap offset\n"); |
| return 0; |
| } |
| |
| return drm_vma_node_offset_addr(&obj->vma_node); |
| } |
| |
| static bool is_contiguous(struct omap_gem_object *omap_obj) |
| { |
| if (omap_obj->flags & OMAP_BO_MEM_DMA_API) |
| return true; |
| |
| if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1) |
| return true; |
| |
| return false; |
| } |
| |
| /* ----------------------------------------------------------------------------- |
| * Eviction |
| */ |
| |
| static void evict_entry(struct drm_gem_object *obj, |
| enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| struct omap_drm_private *priv = obj->dev->dev_private; |
| int n = priv->usergart[fmt].height; |
| size_t size = PAGE_SIZE * n; |
| loff_t off = mmap_offset(obj) + |
| (entry->obj_pgoff << PAGE_SHIFT); |
| const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE); |
| |
| if (m > 1) { |
| int i; |
| /* if stride > than PAGE_SIZE then sparse mapping: */ |
| for (i = n; i > 0; i--) { |
| unmap_mapping_range(obj->dev->anon_inode->i_mapping, |
| off, PAGE_SIZE, 1); |
| off += PAGE_SIZE * m; |
| } |
| } else { |
| unmap_mapping_range(obj->dev->anon_inode->i_mapping, |
| off, size, 1); |
| } |
| |
| entry->obj = NULL; |
| } |
| |
| /* Evict a buffer from usergart, if it is mapped there */ |
| static void evict(struct drm_gem_object *obj) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| struct omap_drm_private *priv = obj->dev->dev_private; |
| |
| if (omap_obj->flags & OMAP_BO_TILED) { |
| enum tiler_fmt fmt = gem2fmt(omap_obj->flags); |
| int i; |
| |
| for (i = 0; i < NUM_USERGART_ENTRIES; i++) { |
| struct omap_drm_usergart_entry *entry = |
| &priv->usergart[fmt].entry[i]; |
| |
| if (entry->obj == obj) |
| evict_entry(obj, fmt, entry); |
| } |
| } |
| } |
| |
| /* ----------------------------------------------------------------------------- |
| * Page Management |
| */ |
| |
| /** 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 npages = obj->size >> PAGE_SHIFT; |
| int i, ret; |
| dma_addr_t *addrs; |
| |
| WARN_ON(omap_obj->pages); |
| |
| pages = drm_gem_get_pages(obj); |
| if (IS_ERR(pages)) { |
| dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages)); |
| return PTR_ERR(pages); |
| } |
| |
| /* for non-cached buffers, ensure the new pages are clean because |
| * DSS, GPU, etc. are not cache coherent: |
| */ |
| if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) { |
| addrs = kmalloc(npages * sizeof(*addrs), GFP_KERNEL); |
| if (!addrs) { |
| ret = -ENOMEM; |
| goto free_pages; |
| } |
| |
| for (i = 0; i < npages; i++) { |
| addrs[i] = dma_map_page(dev->dev, pages[i], |
| 0, PAGE_SIZE, DMA_BIDIRECTIONAL); |
| |
| if (dma_mapping_error(dev->dev, addrs[i])) { |
| dev_warn(dev->dev, |
| "%s: failed to map page\n", __func__); |
| |
| for (i = i - 1; i >= 0; --i) { |
| dma_unmap_page(dev->dev, addrs[i], |
| PAGE_SIZE, DMA_BIDIRECTIONAL); |
| } |
| |
| ret = -ENOMEM; |
| goto free_addrs; |
| } |
| } |
| } else { |
| addrs = kzalloc(npages * sizeof(*addrs), GFP_KERNEL); |
| if (!addrs) { |
| ret = -ENOMEM; |
| goto free_pages; |
| } |
| } |
| |
| omap_obj->addrs = addrs; |
| omap_obj->pages = pages; |
| |
| return 0; |
| |
| free_addrs: |
| kfree(addrs); |
| free_pages: |
| drm_gem_put_pages(obj, pages, true, false); |
| |
| return ret; |
| } |
| |
| /* acquire pages when needed (for example, for DMA where physically |
| * contiguous buffer is not required |
| */ |
| static int get_pages(struct drm_gem_object *obj, struct page ***pages) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret = 0; |
| |
| if ((omap_obj->flags & OMAP_BO_MEM_SHMEM) && !omap_obj->pages) { |
| ret = omap_gem_attach_pages(obj); |
| if (ret) { |
| dev_err(obj->dev->dev, "could not attach pages\n"); |
| return ret; |
| } |
| } |
| |
| /* TODO: even phys-contig.. we should have a list of pages? */ |
| *pages = omap_obj->pages; |
| |
| return 0; |
| } |
| |
| /** release backing pages */ |
| static void omap_gem_detach_pages(struct drm_gem_object *obj) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| |
| /* for non-cached buffers, ensure the new pages are clean because |
| * DSS, GPU, etc. are not cache coherent: |
| */ |
| if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) { |
| int i, npages = obj->size >> PAGE_SHIFT; |
| for (i = 0; i < npages; i++) { |
| dma_unmap_page(obj->dev->dev, omap_obj->addrs[i], |
| PAGE_SIZE, DMA_BIDIRECTIONAL); |
| } |
| } |
| |
| kfree(omap_obj->addrs); |
| omap_obj->addrs = NULL; |
| |
| drm_gem_put_pages(obj, omap_obj->pages, true, false); |
| omap_obj->pages = NULL; |
| } |
| |
| /* get buffer flags */ |
| uint32_t omap_gem_flags(struct drm_gem_object *obj) |
| { |
| return to_omap_bo(obj)->flags; |
| } |
| |
| uint64_t omap_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; |
| } |
| |
| /** get mmap size */ |
| size_t omap_gem_mmap_size(struct drm_gem_object *obj) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| size_t size = obj->size; |
| |
| if (omap_obj->flags & OMAP_BO_TILED) { |
| /* for tiled buffers, the virtual size has stride rounded up |
| * to 4kb.. (to hide the fact that row n+1 might start 16kb or |
| * 32kb later!). But we don't back the entire buffer with |
| * pages, only the valid picture part.. so need to adjust for |
| * this in the size used to mmap and generate mmap offset |
| */ |
| size = tiler_vsize(gem2fmt(omap_obj->flags), |
| omap_obj->width, omap_obj->height); |
| } |
| |
| return size; |
| } |
| |
| /* ----------------------------------------------------------------------------- |
| * Fault Handling |
| */ |
| |
| /* Normal handling for the case of faulting in non-tiled buffers */ |
| static int fault_1d(struct drm_gem_object *obj, |
| struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| unsigned long pfn; |
| pgoff_t pgoff; |
| |
| /* We don't use vmf->pgoff since that has the fake offset: */ |
| pgoff = ((unsigned long)vmf->virtual_address - |
| 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(!is_contiguous(omap_obj)); |
| pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff; |
| } |
| |
| VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, |
| pfn, pfn << PAGE_SHIFT); |
| |
| return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, |
| __pfn_to_pfn_t(pfn, PFN_DEV)); |
| } |
| |
| /* Special handling for the case of faulting in 2d tiled buffers */ |
| static int fault_2d(struct drm_gem_object *obj, |
| struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| struct omap_drm_private *priv = obj->dev->dev_private; |
| struct omap_drm_usergart_entry *entry; |
| enum tiler_fmt fmt = gem2fmt(omap_obj->flags); |
| struct page *pages[64]; /* XXX is this too much to have on stack? */ |
| unsigned long pfn; |
| pgoff_t pgoff, base_pgoff; |
| void __user *vaddr; |
| int i, ret, slots; |
| |
| /* |
| * Note the height of the slot is also equal to the number of pages |
| * that need to be mapped in to fill 4kb wide CPU page. If the slot |
| * height is 64, then 64 pages fill a 4kb wide by 64 row region. |
| */ |
| const int n = priv->usergart[fmt].height; |
| const int n_shift = priv->usergart[fmt].height_shift; |
| |
| /* |
| * If buffer width in bytes > PAGE_SIZE then the virtual stride is |
| * rounded up to next multiple of PAGE_SIZE.. this need to be taken |
| * into account in some of the math, so figure out virtual stride |
| * in pages |
| */ |
| const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE); |
| |
| /* We don't use vmf->pgoff since that has the fake offset: */ |
| pgoff = ((unsigned long)vmf->virtual_address - |
| vma->vm_start) >> PAGE_SHIFT; |
| |
| /* |
| * Actual address we start mapping at is rounded down to previous slot |
| * boundary in the y direction: |
| */ |
| base_pgoff = round_down(pgoff, m << n_shift); |
| |
| /* figure out buffer width in slots */ |
| slots = omap_obj->width >> priv->usergart[fmt].slot_shift; |
| |
| vaddr = vmf->virtual_address - ((pgoff - base_pgoff) << PAGE_SHIFT); |
| |
| entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last]; |
| |
| /* evict previous buffer using this usergart entry, if any: */ |
| if (entry->obj) |
| evict_entry(entry->obj, fmt, entry); |
| |
| entry->obj = obj; |
| entry->obj_pgoff = base_pgoff; |
| |
| /* now convert base_pgoff to phys offset from virt offset: */ |
| base_pgoff = (base_pgoff >> n_shift) * slots; |
| |
| /* for wider-than 4k.. figure out which part of the slot-row we want: */ |
| if (m > 1) { |
| int off = pgoff % m; |
| entry->obj_pgoff += off; |
| base_pgoff /= m; |
| slots = min(slots - (off << n_shift), n); |
| base_pgoff += off << n_shift; |
| vaddr += off << PAGE_SHIFT; |
| } |
| |
| /* |
| * Map in pages. Beyond the valid pixel part of the buffer, we set |
| * pages[i] to NULL to get a dummy page mapped in.. if someone |
| * reads/writes it they will get random/undefined content, but at |
| * least it won't be corrupting whatever other random page used to |
| * be mapped in, or other undefined behavior. |
| */ |
| memcpy(pages, &omap_obj->pages[base_pgoff], |
| sizeof(struct page *) * slots); |
| memset(pages + slots, 0, |
| sizeof(struct page *) * (n - slots)); |
| |
| ret = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true); |
| if (ret) { |
| dev_err(obj->dev->dev, "failed to pin: %d\n", ret); |
| return ret; |
| } |
| |
| pfn = entry->paddr >> PAGE_SHIFT; |
| |
| VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, |
| pfn, pfn << PAGE_SHIFT); |
| |
| for (i = n; i > 0; i--) { |
| vm_insert_mixed(vma, (unsigned long)vaddr, |
| __pfn_to_pfn_t(pfn, PFN_DEV)); |
| pfn += priv->usergart[fmt].stride_pfn; |
| vaddr += PAGE_SIZE * m; |
| } |
| |
| /* simple round-robin: */ |
| priv->usergart[fmt].last = (priv->usergart[fmt].last + 1) |
| % NUM_USERGART_ENTRIES; |
| |
| return 0; |
| } |
| |
| /** |
| * omap_gem_fault - pagefault handler for GEM objects |
| * @vma: the VMA of the GEM object |
| * @vmf: fault detail |
| * |
| * Invoked when a fault occurs on an mmap of a GEM managed area. GEM |
| * does most of the work for us including the actual map/unmap calls |
| * but we need to do the actual page work. |
| * |
| * The VMA was set up by GEM. In doing so it also ensured that the |
| * vma->vm_private_data points to the GEM object that is backing this |
| * mapping. |
| */ |
| int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct drm_gem_object *obj = vma->vm_private_data; |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| struct drm_device *dev = obj->dev; |
| struct page **pages; |
| int ret; |
| |
| /* Make sure we don't parallel update on a fault, nor move or remove |
| * something from beneath our feet |
| */ |
| mutex_lock(&dev->struct_mutex); |
| |
| /* if a shmem backed object, make sure we have pages attached now */ |
| ret = get_pages(obj, &pages); |
| if (ret) |
| goto fail; |
| |
| /* where should we do corresponding put_pages().. we are mapping |
| * the original page, rather than thru a GART, so we can't rely |
| * on eviction to trigger this. But munmap() or all mappings should |
| * probably trigger put_pages()? |
| */ |
| |
| if (omap_obj->flags & OMAP_BO_TILED) |
| ret = fault_2d(obj, vma, vmf); |
| else |
| ret = fault_1d(obj, vma, vmf); |
| |
| |
| fail: |
| mutex_unlock(&dev->struct_mutex); |
| switch (ret) { |
| case 0: |
| case -ERESTARTSYS: |
| case -EINTR: |
| case -EBUSY: |
| /* |
| * EBUSY is ok: this just means that another thread |
| * already did the job. |
| */ |
| return VM_FAULT_NOPAGE; |
| case -ENOMEM: |
| return VM_FAULT_OOM; |
| default: |
| return VM_FAULT_SIGBUS; |
| } |
| } |
| |
| /** We override mainly to fix up some of the vm mapping flags.. */ |
| int omap_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 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; |
| |
| if (omap_obj->flags & OMAP_BO_WC) { |
| vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
| } 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); |
| vma->vm_pgoff = 0; |
| vma->vm_file = get_file(obj->filp); |
| |
| vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
| } |
| |
| return 0; |
| } |
| |
| /* ----------------------------------------------------------------------------- |
| * Dumb Buffers |
| */ |
| |
| /** |
| * omap_gem_dumb_create - create a dumb buffer |
| * @drm_file: our client file |
| * @dev: our device |
| * @args: the requested arguments copied from userspace |
| * |
| * Allocate a buffer suitable for use for a frame buffer of the |
| * form described by user space. Give userspace a handle by which |
| * to reference it. |
| */ |
| int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev, |
| struct drm_mode_create_dumb *args) |
| { |
| union omap_gem_size gsize; |
| |
| args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); |
| |
| args->size = PAGE_ALIGN(args->pitch * args->height); |
| |
| gsize = (union omap_gem_size){ |
| .bytes = args->size, |
| }; |
| |
| return omap_gem_new_handle(dev, file, gsize, |
| OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle); |
| } |
| |
| /** |
| * omap_gem_dumb_map - buffer mapping for dumb interface |
| * @file: our drm client file |
| * @dev: drm device |
| * @handle: GEM handle to the object (from dumb_create) |
| * |
| * Do the necessary setup to allow the mapping of the frame buffer |
| * into user memory. We don't have to do much here at the moment. |
| */ |
| int omap_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(file, handle); |
| if (obj == NULL) { |
| ret = -ENOENT; |
| goto fail; |
| } |
| |
| *offset = omap_gem_mmap_offset(obj); |
| |
| drm_gem_object_unreference_unlocked(obj); |
| |
| fail: |
| return ret; |
| } |
| |
| #ifdef CONFIG_DRM_FBDEV_EMULATION |
| /* Set scrolling position. This allows us to implement fast scrolling |
| * for console. |
| * |
| * Call only from non-atomic contexts. |
| */ |
| int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| uint32_t npages = obj->size >> PAGE_SHIFT; |
| int ret = 0; |
| |
| if (roll > npages) { |
| dev_err(obj->dev->dev, "invalid roll: %d\n", roll); |
| return -EINVAL; |
| } |
| |
| omap_obj->roll = roll; |
| |
| mutex_lock(&obj->dev->struct_mutex); |
| |
| /* if we aren't mapped yet, we don't need to do anything */ |
| if (omap_obj->block) { |
| struct page **pages; |
| ret = get_pages(obj, &pages); |
| if (ret) |
| goto fail; |
| ret = tiler_pin(omap_obj->block, pages, npages, roll, true); |
| if (ret) |
| dev_err(obj->dev->dev, "could not repin: %d\n", ret); |
| } |
| |
| fail: |
| mutex_unlock(&obj->dev->struct_mutex); |
| |
| return ret; |
| } |
| #endif |
| |
| /* ----------------------------------------------------------------------------- |
| * Memory Management & DMA Sync |
| */ |
| |
| /** |
| * 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 (omap_obj->flags & OMAP_BO_MEM_SHMEM) && |
| ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED); |
| } |
| |
| /* 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]) { |
| dma_addr_t addr; |
| |
| addr = dma_map_page(dev->dev, pages[i], 0, |
| PAGE_SIZE, DMA_BIDIRECTIONAL); |
| |
| if (dma_mapping_error(dev->dev, addr)) { |
| dev_warn(dev->dev, |
| "%s: failed to map page\n", |
| __func__); |
| break; |
| } |
| |
| dirty = true; |
| omap_obj->addrs[i] = addr; |
| } |
| } |
| |
| 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) |
| */ |
| int omap_gem_get_paddr(struct drm_gem_object *obj, |
| dma_addr_t *paddr, bool remap) |
| { |
| struct omap_drm_private *priv = obj->dev->dev_private; |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret = 0; |
| |
| mutex_lock(&obj->dev->struct_mutex); |
| |
| if (!is_contiguous(omap_obj) && remap && priv->has_dmm) { |
| if (omap_obj->paddr_cnt == 0) { |
| struct page **pages; |
| uint32_t npages = obj->size >> PAGE_SHIFT; |
| enum tiler_fmt fmt = gem2fmt(omap_obj->flags); |
| struct tiler_block *block; |
| |
| BUG_ON(omap_obj->block); |
| |
| ret = get_pages(obj, &pages); |
| if (ret) |
| goto fail; |
| |
| if (omap_obj->flags & OMAP_BO_TILED) { |
| block = tiler_reserve_2d(fmt, |
| omap_obj->width, |
| omap_obj->height, 0); |
| } else { |
| block = tiler_reserve_1d(obj->size); |
| } |
| |
| if (IS_ERR(block)) { |
| ret = PTR_ERR(block); |
| dev_err(obj->dev->dev, |
| "could not remap: %d (%d)\n", ret, fmt); |
| goto fail; |
| } |
| |
| /* TODO: enable async refill.. */ |
| ret = tiler_pin(block, pages, npages, |
| omap_obj->roll, true); |
| if (ret) { |
| tiler_release(block); |
| dev_err(obj->dev->dev, |
| "could not pin: %d\n", ret); |
| goto fail; |
| } |
| |
| omap_obj->paddr = tiler_ssptr(block); |
| omap_obj->block = block; |
| |
| DBG("got paddr: %pad", &omap_obj->paddr); |
| } |
| |
| omap_obj->paddr_cnt++; |
| |
| *paddr = omap_obj->paddr; |
| } else if (is_contiguous(omap_obj)) { |
| *paddr = omap_obj->paddr; |
| } else { |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| fail: |
| mutex_unlock(&obj->dev->struct_mutex); |
| |
| return ret; |
| } |
| |
| /* Release physical address, when DMA is no longer being performed.. this |
| * could potentially unpin and unmap buffers from TILER |
| */ |
| void omap_gem_put_paddr(struct drm_gem_object *obj) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret; |
| |
| mutex_lock(&obj->dev->struct_mutex); |
| if (omap_obj->paddr_cnt > 0) { |
| omap_obj->paddr_cnt--; |
| if (omap_obj->paddr_cnt == 0) { |
| ret = tiler_unpin(omap_obj->block); |
| if (ret) { |
| dev_err(obj->dev->dev, |
| "could not unpin pages: %d\n", ret); |
| } |
| ret = tiler_release(omap_obj->block); |
| if (ret) { |
| dev_err(obj->dev->dev, |
| "could not release unmap: %d\n", ret); |
| } |
| omap_obj->paddr = 0; |
| omap_obj->block = NULL; |
| } |
| } |
| |
| mutex_unlock(&obj->dev->struct_mutex); |
| } |
| |
| /* Get rotated scanout address (only valid if already pinned), at the |
| * specified orientation and x,y offset from top-left corner of buffer |
| * (only valid for tiled 2d buffers) |
| */ |
| int omap_gem_rotated_paddr(struct drm_gem_object *obj, uint32_t orient, |
| int x, int y, dma_addr_t *paddr) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret = -EINVAL; |
| |
| mutex_lock(&obj->dev->struct_mutex); |
| if ((omap_obj->paddr_cnt > 0) && omap_obj->block && |
| (omap_obj->flags & OMAP_BO_TILED)) { |
| *paddr = tiler_tsptr(omap_obj->block, orient, x, y); |
| ret = 0; |
| } |
| mutex_unlock(&obj->dev->struct_mutex); |
| return ret; |
| } |
| |
| /* Get tiler stride for the buffer (only valid for 2d tiled buffers) */ |
| int omap_gem_tiled_stride(struct drm_gem_object *obj, uint32_t orient) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret = -EINVAL; |
| if (omap_obj->flags & OMAP_BO_TILED) |
| ret = tiler_stride(gem2fmt(omap_obj->flags), orient); |
| return ret; |
| } |
| |
| /* if !remap, and we don't have pages backing, then fail, rather than |
| * increasing the pin count (which we don't really do yet anyways, |
| * because we don't support swapping pages back out). And 'remap' |
| * might not be quite the right name, but I wanted to keep it working |
| * similarly to omap_gem_get_paddr(). Note though that mutex is not |
| * aquired if !remap (because this can be called in atomic ctxt), |
| * but probably omap_gem_get_paddr() should be changed to work in the |
| * same way. If !remap, a matching omap_gem_put_pages() call is not |
| * required (and should not be made). |
| */ |
| int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages, |
| bool remap) |
| { |
| int ret; |
| if (!remap) { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| if (!omap_obj->pages) |
| return -ENOMEM; |
| *pages = omap_obj->pages; |
| return 0; |
| } |
| mutex_lock(&obj->dev->struct_mutex); |
| ret = get_pages(obj, pages); |
| mutex_unlock(&obj->dev->struct_mutex); |
| return ret; |
| } |
| |
| /* release pages when DMA no longer being performed */ |
| int omap_gem_put_pages(struct drm_gem_object *obj) |
| { |
| /* do something here if we dynamically attach/detach pages.. at |
| * least they would no longer need to be pinned if everyone has |
| * released the pages.. |
| */ |
| return 0; |
| } |
| |
| #ifdef CONFIG_DRM_FBDEV_EMULATION |
| /* Get kernel virtual address for CPU access.. this more or less only |
| * exists for omap_fbdev. This should be called with struct_mutex |
| * held. |
| */ |
| void *omap_gem_vaddr(struct drm_gem_object *obj) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); |
| if (!omap_obj->vaddr) { |
| struct page **pages; |
| int ret = get_pages(obj, &pages); |
| if (ret) |
| return ERR_PTR(ret); |
| omap_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT, |
| VM_MAP, pgprot_writecombine(PAGE_KERNEL)); |
| } |
| return omap_obj->vaddr; |
| } |
| #endif |
| |
| /* ----------------------------------------------------------------------------- |
| * Power Management |
| */ |
| |
| #ifdef CONFIG_PM |
| /* re-pin objects in DMM in resume path: */ |
| int omap_gem_resume(struct device *dev) |
| { |
| struct drm_device *drm_dev = dev_get_drvdata(dev); |
| struct omap_drm_private *priv = drm_dev->dev_private; |
| struct omap_gem_object *omap_obj; |
| int ret = 0; |
| |
| list_for_each_entry(omap_obj, &priv->obj_list, mm_list) { |
| if (omap_obj->block) { |
| struct drm_gem_object *obj = &omap_obj->base; |
| uint32_t npages = obj->size >> PAGE_SHIFT; |
| WARN_ON(!omap_obj->pages); /* this can't happen */ |
| ret = tiler_pin(omap_obj->block, |
| omap_obj->pages, npages, |
| omap_obj->roll, true); |
| if (ret) { |
| dev_err(dev, "could not repin: %d\n", ret); |
| return ret; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| /* ----------------------------------------------------------------------------- |
| * DebugFS |
| */ |
| |
| #ifdef CONFIG_DEBUG_FS |
| void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| uint64_t off; |
| |
| off = drm_vma_node_start(&obj->vma_node); |
| |
| seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d", |
| omap_obj->flags, obj->name, obj->refcount.refcount.counter, |
| off, &omap_obj->paddr, omap_obj->paddr_cnt, |
| omap_obj->vaddr, omap_obj->roll); |
| |
| if (omap_obj->flags & OMAP_BO_TILED) { |
| seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height); |
| if (omap_obj->block) { |
| struct tcm_area *area = &omap_obj->block->area; |
| seq_printf(m, " (%dx%d, %dx%d)", |
| area->p0.x, area->p0.y, |
| area->p1.x, area->p1.y); |
| } |
| } else { |
| seq_printf(m, " %d", obj->size); |
| } |
| |
| seq_printf(m, "\n"); |
| } |
| |
| void omap_gem_describe_objects(struct list_head *list, struct seq_file *m) |
| { |
| struct omap_gem_object *omap_obj; |
| int count = 0; |
| size_t size = 0; |
| |
| list_for_each_entry(omap_obj, list, mm_list) { |
| struct drm_gem_object *obj = &omap_obj->base; |
| seq_printf(m, " "); |
| omap_gem_describe(obj, m); |
| count++; |
| size += obj->size; |
| } |
| |
| seq_printf(m, "Total %d objects, %zu bytes\n", count, size); |
| } |
| #endif |
| |
| /* ----------------------------------------------------------------------------- |
| * Buffer Synchronization |
| */ |
| |
| static DEFINE_SPINLOCK(sync_lock); |
| |
| struct omap_gem_sync_waiter { |
| struct list_head list; |
| struct omap_gem_object *omap_obj; |
| enum omap_gem_op op; |
| uint32_t read_target, write_target; |
| /* notify called w/ sync_lock held */ |
| void (*notify)(void *arg); |
| void *arg; |
| }; |
| |
| /* list of omap_gem_sync_waiter.. the notify fxn gets called back when |
| * the read and/or write target count is achieved which can call a user |
| * callback (ex. to kick 3d and/or 2d), wakeup blocked task (prep for |
| * cpu access), etc. |
| */ |
| static LIST_HEAD(waiters); |
| |
| static inline bool is_waiting(struct omap_gem_sync_waiter *waiter) |
| { |
| struct omap_gem_object *omap_obj = waiter->omap_obj; |
| if ((waiter->op & OMAP_GEM_READ) && |
| (omap_obj->sync->write_complete < waiter->write_target)) |
| return true; |
| if ((waiter->op & OMAP_GEM_WRITE) && |
| (omap_obj->sync->read_complete < waiter->read_target)) |
| return true; |
| return false; |
| } |
| |
| /* macro for sync debug.. */ |
| #define SYNCDBG 0 |
| #define SYNC(fmt, ...) do { if (SYNCDBG) \ |
| printk(KERN_ERR "%s:%d: "fmt"\n", \ |
| __func__, __LINE__, ##__VA_ARGS__); \ |
| } while (0) |
| |
| |
| static void sync_op_update(void) |
| { |
| struct omap_gem_sync_waiter *waiter, *n; |
| list_for_each_entry_safe(waiter, n, &waiters, list) { |
| if (!is_waiting(waiter)) { |
| list_del(&waiter->list); |
| SYNC("notify: %p", waiter); |
| waiter->notify(waiter->arg); |
| kfree(waiter); |
| } |
| } |
| } |
| |
| static inline int sync_op(struct drm_gem_object *obj, |
| enum omap_gem_op op, bool start) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret = 0; |
| |
| spin_lock(&sync_lock); |
| |
| if (!omap_obj->sync) { |
| omap_obj->sync = kzalloc(sizeof(*omap_obj->sync), GFP_ATOMIC); |
| if (!omap_obj->sync) { |
| ret = -ENOMEM; |
| goto unlock; |
| } |
| } |
| |
| if (start) { |
| if (op & OMAP_GEM_READ) |
| omap_obj->sync->read_pending++; |
| if (op & OMAP_GEM_WRITE) |
| omap_obj->sync->write_pending++; |
| } else { |
| if (op & OMAP_GEM_READ) |
| omap_obj->sync->read_complete++; |
| if (op & OMAP_GEM_WRITE) |
| omap_obj->sync->write_complete++; |
| sync_op_update(); |
| } |
| |
| unlock: |
| spin_unlock(&sync_lock); |
| |
| return ret; |
| } |
| |
| /* mark the start of read and/or write operation */ |
| int omap_gem_op_start(struct drm_gem_object *obj, enum omap_gem_op op) |
| { |
| return sync_op(obj, op, true); |
| } |
| |
| int omap_gem_op_finish(struct drm_gem_object *obj, enum omap_gem_op op) |
| { |
| return sync_op(obj, op, false); |
| } |
| |
| static DECLARE_WAIT_QUEUE_HEAD(sync_event); |
| |
| static void sync_notify(void *arg) |
| { |
| struct task_struct **waiter_task = arg; |
| *waiter_task = NULL; |
| wake_up_all(&sync_event); |
| } |
| |
| int omap_gem_op_sync(struct drm_gem_object *obj, enum omap_gem_op op) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| int ret = 0; |
| if (omap_obj->sync) { |
| struct task_struct *waiter_task = current; |
| struct omap_gem_sync_waiter *waiter = |
| kzalloc(sizeof(*waiter), GFP_KERNEL); |
| |
| if (!waiter) |
| return -ENOMEM; |
| |
| waiter->omap_obj = omap_obj; |
| waiter->op = op; |
| waiter->read_target = omap_obj->sync->read_pending; |
| waiter->write_target = omap_obj->sync->write_pending; |
| waiter->notify = sync_notify; |
| waiter->arg = &waiter_task; |
| |
| spin_lock(&sync_lock); |
| if (is_waiting(waiter)) { |
| SYNC("waited: %p", waiter); |
| list_add_tail(&waiter->list, &waiters); |
| spin_unlock(&sync_lock); |
| ret = wait_event_interruptible(sync_event, |
| (waiter_task == NULL)); |
| spin_lock(&sync_lock); |
| if (waiter_task) { |
| SYNC("interrupted: %p", waiter); |
| /* we were interrupted */ |
| list_del(&waiter->list); |
| waiter_task = NULL; |
| } else { |
| /* freed in sync_op_update() */ |
| waiter = NULL; |
| } |
| } |
| spin_unlock(&sync_lock); |
| kfree(waiter); |
| } |
| return ret; |
| } |
| |
| /* call fxn(arg), either synchronously or asynchronously if the op |
| * is currently blocked.. fxn() can be called from any context |
| * |
| * (TODO for now fxn is called back from whichever context calls |
| * omap_gem_op_finish().. but this could be better defined later |
| * if needed) |
| * |
| * TODO more code in common w/ _sync().. |
| */ |
| int omap_gem_op_async(struct drm_gem_object *obj, enum omap_gem_op op, |
| void (*fxn)(void *arg), void *arg) |
| { |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| if (omap_obj->sync) { |
| struct omap_gem_sync_waiter *waiter = |
| kzalloc(sizeof(*waiter), GFP_ATOMIC); |
| |
| if (!waiter) |
| return -ENOMEM; |
| |
| waiter->omap_obj = omap_obj; |
| waiter->op = op; |
| waiter->read_target = omap_obj->sync->read_pending; |
| waiter->write_target = omap_obj->sync->write_pending; |
| waiter->notify = fxn; |
| waiter->arg = arg; |
| |
| spin_lock(&sync_lock); |
| if (is_waiting(waiter)) { |
| SYNC("waited: %p", waiter); |
| list_add_tail(&waiter->list, &waiters); |
| spin_unlock(&sync_lock); |
| return 0; |
| } |
| |
| spin_unlock(&sync_lock); |
| |
| kfree(waiter); |
| } |
| |
| /* no waiting.. */ |
| fxn(arg); |
| |
| return 0; |
| } |
| |
| /* ----------------------------------------------------------------------------- |
| * Constructor & Destructor |
| */ |
| |
| void omap_gem_free_object(struct drm_gem_object *obj) |
| { |
| struct drm_device *dev = obj->dev; |
| struct omap_drm_private *priv = dev->dev_private; |
| struct omap_gem_object *omap_obj = to_omap_bo(obj); |
| |
| evict(obj); |
| |
| WARN_ON(!mutex_is_locked(&dev->struct_mutex)); |
| |
| spin_lock(&priv->list_lock); |
| list_del(&omap_obj->mm_list); |
| spin_unlock(&priv->list_lock); |
| |
| /* this means the object is still pinned.. which really should |
| * not happen. I think.. |
| */ |
| WARN_ON(omap_obj->paddr_cnt > 0); |
| |
| if (omap_obj->pages) { |
| if (omap_obj->flags & OMAP_BO_MEM_DMABUF) |
| kfree(omap_obj->pages); |
| else |
| omap_gem_detach_pages(obj); |
| } |
| |
| if (omap_obj->flags & OMAP_BO_MEM_DMA_API) { |
| dma_free_wc(dev->dev, obj->size, omap_obj->vaddr, |
| omap_obj->paddr); |
| } else if (omap_obj->vaddr) { |
| vunmap(omap_obj->vaddr); |
| } else if (obj->import_attach) { |
| drm_prime_gem_destroy(obj, omap_obj->sgt); |
| } |
| |
| kfree(omap_obj->sync); |
| |
| drm_gem_object_release(obj); |
| |
| kfree(omap_obj); |
| } |
| |
| /* GEM buffer object constructor */ |
| struct drm_gem_object *omap_gem_new(struct drm_device *dev, |
| union omap_gem_size gsize, uint32_t flags) |
| { |
| struct omap_drm_private *priv = dev->dev_private; |
| struct omap_gem_object *omap_obj; |
| struct drm_gem_object *obj; |
| struct address_space *mapping; |
| size_t size; |
| int ret; |
| |
| /* Validate the flags and compute the memory and cache flags. */ |
| if (flags & OMAP_BO_TILED) { |
| if (!priv->usergart) { |
| dev_err(dev->dev, "Tiled buffers require DMM\n"); |
| return NULL; |
| } |
| |
| /* |
| * Tiled buffers are always shmem paged backed. When they are |
| * scanned out, they are remapped into DMM/TILER. |
| */ |
| flags &= ~OMAP_BO_SCANOUT; |
| flags |= OMAP_BO_MEM_SHMEM; |
| |
| /* |
| * Currently don't allow cached buffers. There is some caching |
| * stuff that needs to be handled better. |
| */ |
| flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED); |
| flags |= tiler_get_cpu_cache_flags(); |
| } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) { |
| /* |
| * OMAP_BO_SCANOUT hints that the buffer doesn't need to be |
| * tiled. However, to lower the pressure on memory allocation, |
| * use contiguous memory only if no TILER is available. |
| */ |
| flags |= OMAP_BO_MEM_DMA_API; |
| } else if (!(flags & OMAP_BO_MEM_DMABUF)) { |
| /* |
| * All other buffers not backed by dma_buf are shmem-backed. |
| */ |
| flags |= OMAP_BO_MEM_SHMEM; |
| } |
| |
| /* Allocate the initialize the OMAP GEM object. */ |
| omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL); |
| if (!omap_obj) |
| return NULL; |
| |
| obj = &omap_obj->base; |
| omap_obj->flags = flags; |
| |
| if (flags & OMAP_BO_TILED) { |
| /* |
| * For tiled buffers align dimensions to slot boundaries and |
| * calculate size based on aligned dimensions. |
| */ |
| tiler_align(gem2fmt(flags), &gsize.tiled.width, |
| &gsize.tiled.height); |
| |
| size = tiler_size(gem2fmt(flags), gsize.tiled.width, |
| gsize.tiled.height); |
| |
| omap_obj->width = gsize.tiled.width; |
| omap_obj->height = gsize.tiled.height; |
| } else { |
| size = PAGE_ALIGN(gsize.bytes); |
| } |
| |
| /* Initialize the GEM object. */ |
| if (!(flags & OMAP_BO_MEM_SHMEM)) { |
| drm_gem_private_object_init(dev, obj, size); |
| } else { |
| ret = drm_gem_object_init(dev, obj, size); |
| if (ret) |
| goto err_free; |
| |
| mapping = file_inode(obj->filp)->i_mapping; |
| mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32); |
| } |
| |
| /* Allocate memory if needed. */ |
| if (flags & OMAP_BO_MEM_DMA_API) { |
| omap_obj->vaddr = dma_alloc_wc(dev->dev, size, |
| &omap_obj->paddr, |
| GFP_KERNEL); |
| if (!omap_obj->vaddr) |
| goto err_release; |
| } |
| |
| spin_lock(&priv->list_lock); |
| list_add(&omap_obj->mm_list, &priv->obj_list); |
| spin_unlock(&priv->list_lock); |
| |
| return obj; |
| |
| err_release: |
| drm_gem_object_release(obj); |
| err_free: |
| kfree(omap_obj); |
| return NULL; |
| } |
| |
| struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size, |
| struct sg_table *sgt) |
| { |
| struct omap_drm_private *priv = dev->dev_private; |
| struct omap_gem_object *omap_obj; |
| struct drm_gem_object *obj; |
| union omap_gem_size gsize; |
| |
| /* Without a DMM only physically contiguous buffers can be supported. */ |
| if (sgt->orig_nents != 1 && !priv->has_dmm) |
| return ERR_PTR(-EINVAL); |
| |
| mutex_lock(&dev->struct_mutex); |
| |
| gsize.bytes = PAGE_ALIGN(size); |
| obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC); |
| if (!obj) { |
| obj = ERR_PTR(-ENOMEM); |
| goto done; |
| } |
| |
| omap_obj = to_omap_bo(obj); |
| omap_obj->sgt = sgt; |
| |
| if (sgt->orig_nents == 1) { |
| omap_obj->paddr = sg_dma_address(sgt->sgl); |
| } else { |
| /* Create pages list from sgt */ |
| struct sg_page_iter iter; |
| struct page **pages; |
| unsigned int npages; |
| unsigned int i = 0; |
| |
| npages = DIV_ROUND_UP(size, PAGE_SIZE); |
| pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL); |
| if (!pages) { |
| omap_gem_free_object(obj); |
| obj = ERR_PTR(-ENOMEM); |
| goto done; |
| } |
| |
| omap_obj->pages = pages; |
| |
| for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) { |
| pages[i++] = sg_page_iter_page(&iter); |
| if (i > npages) |
| break; |
| } |
| |
| if (WARN_ON(i != npages)) { |
| omap_gem_free_object(obj); |
| obj = ERR_PTR(-ENOMEM); |
| goto done; |
| } |
| } |
| |
| done: |
| mutex_unlock(&dev->struct_mutex); |
| return obj; |
| } |
| |
| /* convenience method to construct a GEM buffer object, and userspace handle */ |
| int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file, |
| union omap_gem_size gsize, uint32_t flags, uint32_t *handle) |
| { |
| struct drm_gem_object *obj; |
| int ret; |
| |
| obj = omap_gem_new(dev, gsize, flags); |
| if (!obj) |
| return -ENOMEM; |
| |
| ret = drm_gem_handle_create(file, obj, handle); |
| if (ret) { |
| omap_gem_free_object(obj); |
| return ret; |
| } |
| |
| /* drop reference from allocate - handle holds it now */ |
| drm_gem_object_unreference_unlocked(obj); |
| |
| return 0; |
| } |
| |
| /* ----------------------------------------------------------------------------- |
| * Init & Cleanup |
| */ |
| |
| /* If DMM is used, we need to set some stuff up.. */ |
| void omap_gem_init(struct drm_device *dev) |
| { |
| struct omap_drm_private *priv = dev->dev_private; |
| struct omap_drm_usergart *usergart; |
| const enum tiler_fmt fmts[] = { |
| TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT |
| }; |
| int i, j; |
| |
| if (!dmm_is_available()) { |
| /* DMM only supported on OMAP4 and later, so this isn't fatal */ |
| dev_warn(dev->dev, "DMM not available, disable DMM support\n"); |
| return; |
| } |
| |
| usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL); |
| if (!usergart) |
| return; |
| |
| /* reserve 4k aligned/wide regions for userspace mappings: */ |
| for (i = 0; i < ARRAY_SIZE(fmts); i++) { |
| uint16_t h = 1, w = PAGE_SIZE >> i; |
| tiler_align(fmts[i], &w, &h); |
| /* note: since each region is 1 4kb page wide, and minimum |
| * number of rows, the height ends up being the same as the |
| * # of pages in the region |
| */ |
| usergart[i].height = h; |
| usergart[i].height_shift = ilog2(h); |
| usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT; |
| usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i); |
| for (j = 0; j < NUM_USERGART_ENTRIES; j++) { |
| struct omap_drm_usergart_entry *entry; |
| struct tiler_block *block; |
| |
| entry = &usergart[i].entry[j]; |
| block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE); |
| if (IS_ERR(block)) { |
| dev_err(dev->dev, |
| "reserve failed: %d, %d, %ld\n", |
| i, j, PTR_ERR(block)); |
| return; |
| } |
| entry->paddr = tiler_ssptr(block); |
| entry->block = block; |
| |
| DBG("%d:%d: %dx%d: paddr=%pad stride=%d", i, j, w, h, |
| &entry->paddr, |
| usergart[i].stride_pfn << PAGE_SHIFT); |
| } |
| } |
| |
| priv->usergart = usergart; |
| priv->has_dmm = true; |
| } |
| |
| void omap_gem_deinit(struct drm_device *dev) |
| { |
| struct omap_drm_private *priv = dev->dev_private; |
| |
| /* I believe we can rely on there being no more outstanding GEM |
| * objects which could depend on usergart/dmm at this point. |
| */ |
| kfree(priv->usergart); |
| } |