// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ * Author: Rob Clark */ #include #include #include #include #include #include #include #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; u32 flags; /** width/height for tiled formats (rounded up to slot boundaries) */ u16 width, height; /** roll applied when mapping to DMM */ u32 roll; /** protects dma_addr_cnt, block, pages, dma_addrs and vaddr */ struct mutex lock; /** * dma_addr 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 dma_addr_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 * dma_addr_cnt) the DMA address must be accessed through omap_gem_pin() * to ensure that the mapping won't disappear unexpectedly. References * must be released with omap_gem_unpin(). */ dma_addr_t dma_addr; /** * # of users of dma_addr */ refcount_t dma_addr_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 *dma_addrs; /** * Virtual address, if mapped. */ void *vaddr; }; #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 dma_addr; 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 */ u64 omap_gem_mmap_offset(struct drm_gem_object *obj) { struct drm_device *dev = obj->dev; int ret; size_t size; /* 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 omap_gem_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 omap_gem_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 = omap_gem_mmap_offset(obj) + (entry->obj_pgoff << PAGE_SHIFT); const int m = DIV_ROUND_UP(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 omap_gem_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_MASK) { 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) omap_gem_evict_entry(obj, fmt, entry); } } } /* ----------------------------------------------------------------------------- * Page Management */ /* * Ensure backing pages are allocated. Must be called with the omap_obj.lock * held. */ 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; lockdep_assert_held(&omap_obj->lock); /* * If not using shmem (in which case backing pages don't need to be * allocated) or if pages are already allocated we're done. */ if (!(omap_obj->flags & OMAP_BO_MEM_SHMEM) || omap_obj->pages) return 0; 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_array(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_TO_DEVICE); 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_TO_DEVICE); } ret = -ENOMEM; goto free_addrs; } } } else { addrs = kcalloc(npages, sizeof(*addrs), GFP_KERNEL); if (!addrs) { ret = -ENOMEM; goto free_pages; } } omap_obj->dma_addrs = addrs; omap_obj->pages = pages; return 0; free_addrs: kfree(addrs); free_pages: drm_gem_put_pages(obj, pages, true, false); return ret; } /* Release backing pages. Must be called with the omap_obj.lock held. */ static void omap_gem_detach_pages(struct drm_gem_object *obj) { struct omap_gem_object *omap_obj = to_omap_bo(obj); unsigned int npages = obj->size >> PAGE_SHIFT; unsigned int i; lockdep_assert_held(&omap_obj->lock); for (i = 0; i < npages; i++) { if (omap_obj->dma_addrs[i]) dma_unmap_page(obj->dev->dev, omap_obj->dma_addrs[i], PAGE_SIZE, DMA_TO_DEVICE); } kfree(omap_obj->dma_addrs); omap_obj->dma_addrs = NULL; drm_gem_put_pages(obj, omap_obj->pages, true, false); omap_obj->pages = NULL; } /* get buffer flags */ u32 omap_gem_flags(struct drm_gem_object *obj) { return to_omap_bo(obj)->flags; } /** 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_MASK) { /* 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 vm_fault_t omap_gem_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 = (vmf->address - vma->vm_start) >> PAGE_SHIFT; if (omap_obj->pages) { omap_gem_cpu_sync_page(obj, pgoff); pfn = page_to_pfn(omap_obj->pages[pgoff]); } else { BUG_ON(!omap_gem_is_contiguous(omap_obj)); pfn = (omap_obj->dma_addr >> PAGE_SHIFT) + pgoff; } VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, pfn, pfn << PAGE_SHIFT); return vmf_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV)); } /* Special handling for the case of faulting in 2d tiled buffers */ static vm_fault_t omap_gem_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; unsigned long vaddr; int i, err, slots; vm_fault_t ret = VM_FAULT_NOPAGE; /* * 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 = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE); /* We don't use vmf->pgoff since that has the fake offset: */ pgoff = (vmf->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->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) omap_gem_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)); err = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true); if (err) { ret = vmf_error(err); dev_err(obj->dev->dev, "failed to pin: %d\n", err); return ret; } pfn = entry->dma_addr >> PAGE_SHIFT; VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, pfn, pfn << PAGE_SHIFT); for (i = n; i > 0; i--) { ret = vmf_insert_mixed(vma, vaddr, __pfn_to_pfn_t(pfn, PFN_DEV)); if (ret & VM_FAULT_ERROR) break; 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 ret; } /** * omap_gem_fault - pagefault handler for GEM objects * @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. */ static vm_fault_t omap_gem_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct drm_gem_object *obj = vma->vm_private_data; struct omap_gem_object *omap_obj = to_omap_bo(obj); int err; vm_fault_t ret; /* Make sure we don't parallel update on a fault, nor move or remove * something from beneath our feet */ mutex_lock(&omap_obj->lock); /* if a shmem backed object, make sure we have pages attached now */ err = omap_gem_attach_pages(obj); if (err) { ret = vmf_error(err); 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_MASK) ret = omap_gem_fault_2d(obj, vma, vmf); else ret = omap_gem_fault_1d(obj, vma, vmf); fail: mutex_unlock(&omap_obj->lock); return ret; } /** 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, u32 handle, u64 *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_put(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, u32 roll) { struct omap_gem_object *omap_obj = to_omap_bo(obj); u32 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(&omap_obj->lock); /* if we aren't mapped yet, we don't need to do anything */ if (omap_obj->block) { ret = omap_gem_attach_pages(obj); if (ret) goto fail; ret = tiler_pin(omap_obj->block, omap_obj->pages, npages, roll, true); if (ret) dev_err(obj->dev->dev, "could not repin: %d\n", ret); } fail: mutex_unlock(&omap_obj->lock); return ret; } #endif /* ----------------------------------------------------------------------------- * Memory Management & DMA Sync */ /* * shmem buffers that are mapped cached are not coherent. * * We keep track of dirty pages using page faulting to perform cache management. * When a page is mapped to the CPU in read/write mode the device can't access * it and omap_obj->dma_addrs[i] is NULL. When a page is mapped to the device * the omap_obj->dma_addrs[i] is set to the DMA address, and the page is * unmapped from the CPU. */ static inline bool omap_gem_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_page(struct drm_gem_object *obj, int pgoff) { struct drm_device *dev = obj->dev; struct omap_gem_object *omap_obj = to_omap_bo(obj); if (omap_gem_is_cached_coherent(obj)) return; if (omap_obj->dma_addrs[pgoff]) { dma_unmap_page(dev->dev, omap_obj->dma_addrs[pgoff], PAGE_SIZE, DMA_TO_DEVICE); omap_obj->dma_addrs[pgoff] = 0; } } /* sync the buffer for DMA access */ void omap_gem_dma_sync_buffer(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); int i, npages = obj->size >> PAGE_SHIFT; struct page **pages = omap_obj->pages; bool dirty = false; if (omap_gem_is_cached_coherent(obj)) return; for (i = 0; i < npages; i++) { if (!omap_obj->dma_addrs[i]) { dma_addr_t addr; addr = dma_map_page(dev->dev, pages[i], 0, PAGE_SIZE, dir); if (dma_mapping_error(dev->dev, addr)) { dev_warn(dev->dev, "%s: failed to map page\n", __func__); break; } dirty = true; omap_obj->dma_addrs[i] = addr; } } if (dirty) { unmap_mapping_range(obj->filp->f_mapping, 0, omap_gem_mmap_size(obj), 1); } } /** * omap_gem_pin() - Pin a GEM object in memory * @obj: the GEM object * @dma_addr: the DMA address * * Pin the given GEM object in memory and fill the dma_addr pointer with the * object's DMA address. If the buffer is not physically contiguous it will be * remapped through the TILER to provide a contiguous view. * * Pins are reference-counted, calling this function multiple times is allowed * as long the corresponding omap_gem_unpin() calls are balanced. * * Return 0 on success or a negative error code otherwise. */ int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr) { struct omap_drm_private *priv = obj->dev->dev_private; struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret = 0; mutex_lock(&omap_obj->lock); if (!omap_gem_is_contiguous(omap_obj) && priv->has_dmm) { if (refcount_read(&omap_obj->dma_addr_cnt) == 0) { u32 npages = obj->size >> PAGE_SHIFT; enum tiler_fmt fmt = gem2fmt(omap_obj->flags); struct tiler_block *block; BUG_ON(omap_obj->block); refcount_set(&omap_obj->dma_addr_cnt, 1); ret = omap_gem_attach_pages(obj); if (ret) goto fail; if (omap_obj->flags & OMAP_BO_TILED_MASK) { 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, omap_obj->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->dma_addr = tiler_ssptr(block); omap_obj->block = block; DBG("got dma address: %pad", &omap_obj->dma_addr); } else { refcount_inc(&omap_obj->dma_addr_cnt); } if (dma_addr) *dma_addr = omap_obj->dma_addr; } else if (omap_gem_is_contiguous(omap_obj)) { if (dma_addr) *dma_addr = omap_obj->dma_addr; } else { ret = -EINVAL; goto fail; } fail: mutex_unlock(&omap_obj->lock); return ret; } /** * omap_gem_unpin_locked() - Unpin a GEM object from memory * @obj: the GEM object * * omap_gem_unpin() without locking. */ static void omap_gem_unpin_locked(struct drm_gem_object *obj) { struct omap_drm_private *priv = obj->dev->dev_private; struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret; if (omap_gem_is_contiguous(omap_obj) || !priv->has_dmm) return; if (refcount_dec_and_test(&omap_obj->dma_addr_cnt)) { 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->dma_addr = 0; omap_obj->block = NULL; } } /** * omap_gem_unpin() - Unpin a GEM object from memory * @obj: the GEM object * * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are * reference-counted, the actual unpin will only be performed when the number * of calls to this function matches the number of calls to omap_gem_pin(). */ void omap_gem_unpin(struct drm_gem_object *obj) { struct omap_gem_object *omap_obj = to_omap_bo(obj); mutex_lock(&omap_obj->lock); omap_gem_unpin_locked(obj); mutex_unlock(&omap_obj->lock); } /* 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_dma_addr(struct drm_gem_object *obj, u32 orient, int x, int y, dma_addr_t *dma_addr) { struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret = -EINVAL; mutex_lock(&omap_obj->lock); if ((refcount_read(&omap_obj->dma_addr_cnt) > 0) && omap_obj->block && (omap_obj->flags & OMAP_BO_TILED_MASK)) { *dma_addr = tiler_tsptr(omap_obj->block, orient, x, y); ret = 0; } mutex_unlock(&omap_obj->lock); return ret; } /* Get tiler stride for the buffer (only valid for 2d tiled buffers) */ int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient) { struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret = -EINVAL; if (omap_obj->flags & OMAP_BO_TILED_MASK) 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_pin(). Note though that mutex is not * aquired if !remap (because this can be called in atomic ctxt), * but probably omap_gem_unpin() 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) { struct omap_gem_object *omap_obj = to_omap_bo(obj); int ret = 0; mutex_lock(&omap_obj->lock); if (remap) { ret = omap_gem_attach_pages(obj); if (ret) goto unlock; } if (!omap_obj->pages) { ret = -ENOMEM; goto unlock; } *pages = omap_obj->pages; unlock: mutex_unlock(&omap_obj->lock); 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. */ void *omap_gem_vaddr(struct drm_gem_object *obj) { struct omap_gem_object *omap_obj = to_omap_bo(obj); void *vaddr; int ret; mutex_lock(&omap_obj->lock); if (!omap_obj->vaddr) { ret = omap_gem_attach_pages(obj); if (ret) { vaddr = ERR_PTR(ret); goto unlock; } omap_obj->vaddr = vmap(omap_obj->pages, obj->size >> PAGE_SHIFT, VM_MAP, pgprot_writecombine(PAGE_KERNEL)); } vaddr = omap_obj->vaddr; unlock: mutex_unlock(&omap_obj->lock); return vaddr; } #endif /* ----------------------------------------------------------------------------- * Power Management */ #ifdef CONFIG_PM /* re-pin objects in DMM in resume path: */ int omap_gem_resume(struct drm_device *dev) { struct omap_drm_private *priv = dev->dev_private; struct omap_gem_object *omap_obj; int ret = 0; mutex_lock(&priv->list_lock); list_for_each_entry(omap_obj, &priv->obj_list, mm_list) { if (omap_obj->block) { struct drm_gem_object *obj = &omap_obj->base; u32 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->dev, "could not repin: %d\n", ret); goto done; } } } done: mutex_unlock(&priv->list_lock); return ret; } #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); u64 off; off = drm_vma_node_start(&obj->vma_node); mutex_lock(&omap_obj->lock); seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d", omap_obj->flags, obj->name, kref_read(&obj->refcount), off, &omap_obj->dma_addr, refcount_read(&omap_obj->dma_addr_cnt), omap_obj->vaddr, omap_obj->roll); if (omap_obj->flags & OMAP_BO_TILED_MASK) { 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, " %zu", obj->size); } mutex_unlock(&omap_obj->lock); 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 /* ----------------------------------------------------------------------------- * Constructor & Destructor */ static 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); omap_gem_evict(obj); mutex_lock(&priv->list_lock); list_del(&omap_obj->mm_list); mutex_unlock(&priv->list_lock); /* * We own the sole reference to the object at this point, but to keep * lockdep happy, we must still take the omap_obj_lock to call * omap_gem_detach_pages(). This should hardly make any difference as * there can't be any lock contention. */ mutex_lock(&omap_obj->lock); /* The object should not be pinned. */ WARN_ON(refcount_read(&omap_obj->dma_addr_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->dma_addr); } else if (omap_obj->vaddr) { vunmap(omap_obj->vaddr); } else if (obj->import_attach) { drm_prime_gem_destroy(obj, omap_obj->sgt); } mutex_unlock(&omap_obj->lock); drm_gem_object_release(obj); mutex_destroy(&omap_obj->lock); kfree(omap_obj); } static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags) { struct omap_drm_private *priv = dev->dev_private; switch (flags & OMAP_BO_CACHE_MASK) { case OMAP_BO_CACHED: case OMAP_BO_WC: case OMAP_BO_CACHE_MASK: break; default: return false; } if (flags & OMAP_BO_TILED_MASK) { if (!priv->usergart) return false; switch (flags & OMAP_BO_TILED_MASK) { case OMAP_BO_TILED_8: case OMAP_BO_TILED_16: case OMAP_BO_TILED_32: break; default: return false; } } return true; } static const struct vm_operations_struct omap_gem_vm_ops = { .fault = omap_gem_fault, .open = drm_gem_vm_open, .close = drm_gem_vm_close, }; static const struct drm_gem_object_funcs omap_gem_object_funcs = { .free = omap_gem_free_object, .export = omap_gem_prime_export, .vm_ops = &omap_gem_vm_ops, }; /* GEM buffer object constructor */ struct drm_gem_object *omap_gem_new(struct drm_device *dev, union omap_gem_size gsize, u32 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; if (!omap_gem_validate_flags(dev, flags)) return NULL; /* Validate the flags and compute the memory and cache flags. */ if (flags & OMAP_BO_TILED_MASK) { /* * Tiled buffers are always shmem paged backed. When they are * scanned out, they are remapped into DMM/TILER. */ 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) { /* * If we don't have DMM, we must allocate scanout buffers * from contiguous DMA memory. */ 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; mutex_init(&omap_obj->lock); if (flags & OMAP_BO_TILED_MASK) { /* * 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); } obj->funcs = &omap_gem_object_funcs; /* 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 = obj->filp->f_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->dma_addr, GFP_KERNEL); if (!omap_obj->vaddr) goto err_release; } mutex_lock(&priv->list_lock); list_add(&omap_obj->mm_list, &priv->obj_list); mutex_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); gsize.bytes = PAGE_ALIGN(size); obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC); if (!obj) return ERR_PTR(-ENOMEM); omap_obj = to_omap_bo(obj); mutex_lock(&omap_obj->lock); omap_obj->sgt = sgt; if (sgt->orig_nents == 1) { omap_obj->dma_addr = 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(&omap_obj->lock); 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, u32 flags, u32 *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_put(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++) { u16 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->dma_addr = tiler_ssptr(block); entry->block = block; DBG("%d:%d: %dx%d: dma_addr=%pad stride=%d", i, j, w, h, &entry->dma_addr, 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); }