--- /dev/null
+/*
+ * 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/spinlock.h>
+#include <linux/shmem_fs.h>
+#include <drm/drm_vma_manager.h>
+
+#include "omap_drv.h"
+#include "omap_dmm_tiler.h"
+
+/* remove these once drm core helpers are merged */
+struct page **_drm_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask);
+void _drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
+ bool dirty, bool accessed);
+int _drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
+
+/*
+ * GEM buffer object implementation.
+ */
+
+#define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
+
+/* note: we use upper 8 bits of flags for driver-internal flags: */
+#define OMAP_BO_DMA 0x01000000 /* actually is physically contiguous */
+#define OMAP_BO_EXT_SYNC 0x02000000 /* externally allocated sync object */
+#define OMAP_BO_EXT_MEM 0x04000000 /* externally allocated memory */
+
+
+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;
+
+ /**
+ * If buffer is allocated physically contiguous, the OMAP_BO_DMA flag
+ * is set and the paddr is valid. Also if the buffer is remapped in
+ * TILER and paddr_cnt > 0, then paddr is valid. But if you are using
+ * the physical address and OMAP_BO_DMA is not set, then you should
+ * be going thru omap_gem_{get,put}_paddr() to ensure the mapping is
+ * not removed from under your feet.
+ *
+ * Note that OMAP_BO_SCANOUT is a hint from userspace that DMA capable
+ * buffer is requested, but doesn't mean that it is. Use the
+ * OMAP_BO_DMA flag to determine if the buffer has a DMA capable
+ * physical address.
+ */
+ dma_addr_t paddr;
+
+ /**
+ * # of users of paddr
+ */
+ uint32_t paddr_cnt;
+
+ /**
+ * 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. The layout in memory is dictated by
+ * the SGX firmware, which uses this information to stall the command
+ * stream if a surface is not ready yet.
+ *
+ * Note that when buffer is used by SGX, the sync-object needs to be
+ * allocated from a special heap of sync-objects. This way many sync
+ * objects can be packed in a page, and not waste GPU virtual address
+ * space. Because of this we have to have a omap_gem_set_sync_object()
+ * API to allow replacement of the syncobj after it has (potentially)
+ * already been allocated. A bit ugly but I haven't thought of a
+ * better alternative.
+ */
+ struct {
+ uint32_t write_pending;
+ uint32_t write_complete;
+ uint32_t read_pending;
+ uint32_t read_complete;
+ } *sync;
+};
+
+static int get_pages(struct drm_gem_object *obj, struct page ***pages);
+static uint64_t mmap_offset(struct drm_gem_object *obj);
+
+/* 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 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 */
+};
+static struct {
+ struct 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 */
+} *usergart;
+
+static void evict_entry(struct drm_gem_object *obj,
+ enum tiler_fmt fmt, struct usergart_entry *entry)
+{
+ struct omap_gem_object *omap_obj = to_omap_bo(obj);
+ int n = 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);
+
+ if (omap_obj->flags & OMAP_BO_TILED) {
+ enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
+ int i;
+
+ if (!usergart)
+ return;
+
+ for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
+ struct usergart_entry *entry = &usergart[fmt].entry[i];
+ if (entry->obj == obj)
+ evict_entry(obj, fmt, entry);
+ }
+ }
+}
+
+/* GEM objects can either be allocated from contiguous memory (in which
+ * case obj->filp==NULL), or w/ shmem backing (obj->filp!=NULL). But non
+ * contiguous buffers can be remapped in TILER/DMM if they need to be
+ * contiguous... but we don't do this all the time to reduce pressure
+ * on TILER/DMM space when we know at allocation time that the buffer
+ * will need to be scanned out.
+ */
+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 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);
+ }
+ } 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_pages:
+ drm_gem_put_pages(obj, pages, true, false);
+
+ return ret;
+}
+
+/** 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;
+}
+
+/** 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);
+}
+
+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;
+}
+
+/* get tiled size, returns -EINVAL if not tiled buffer */
+int omap_gem_tiled_size(struct drm_gem_object *obj, uint16_t *w, uint16_t *h)
+{
+ struct omap_gem_object *omap_obj = to_omap_bo(obj);
+ if (omap_obj->flags & OMAP_BO_TILED) {
+ *w = omap_obj->width;
+ *h = omap_obj->height;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+/* 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(!(omap_obj->flags & OMAP_BO_DMA));
+ 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);
+}
+
+/* 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 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 = usergart[fmt].height;
+ const int n_shift = 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 >> usergart[fmt].slot_shift;
+
+ vaddr = vmf->virtual_address - ((pgoff - base_pgoff) << PAGE_SHIFT);
+
+ entry = &usergart[fmt].entry[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);
+ pfn += usergart[fmt].stride_pfn;
+ vaddr += PAGE_SIZE * m;
+ }
+
+ /* simple round-robin: */
+ usergart[fmt].last = (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:
+ 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;
+}
+
+
+/**
+ * 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 = align_pitch(0, args->width, args->bpp);
+ 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(dev, file, handle);
+ if (obj == NULL) {
+ ret = -ENOENT;
+ goto fail;
+ }
+
+ *offset = omap_gem_mmap_offset(obj);
+
+ drm_gem_object_unreference_unlocked(obj);
+
+fail:
+ return ret;
+}
+
+/* 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;
+}
+
+/* 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)
+ */
+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 (remap && is_shmem(obj) && 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 (omap_obj->flags & OMAP_BO_DMA) {
+ *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
+ */
+int omap_gem_put_paddr(struct drm_gem_object *obj)
+{
+ struct omap_gem_object *omap_obj = to_omap_bo(obj);
+ int ret = 0;
+
+ 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);
+ goto fail;
+ }
+ 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;
+ }
+ }
+fail:
+ mutex_unlock(&obj->dev->struct_mutex);
+ return ret;
+}
+
+/* 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;
+}
+
+/* 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 (is_shmem(obj) && !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;
+}
+
+/* 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;
+}
+
+/* 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;
+}
+
+#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
+
+#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:
+ */
+
+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;
+}
+
+/* it is a bit lame to handle updates in this sort of polling way, but
+ * in case of PVR, the GPU can directly update read/write complete
+ * values, and not really tell us which ones it updated.. this also
+ * means that sync_lock is not quite sufficient. So we'll need to
+ * do something a bit better when it comes time to add support for
+ * separate 2d hw..
+ */
+void omap_gem_op_update(void)
+{
+ spin_lock(&sync_lock);
+ sync_op_update();
+ spin_unlock(&sync_lock);
+}
+
+/* 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_update().. 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;
+}
+
+/* special API so PVR can update the buffer to use a sync-object allocated
+ * from it's sync-obj heap. Only used for a newly allocated (from PVR's
+ * perspective) sync-object, so we overwrite the new syncobj w/ values
+ * from the already allocated syncobj (if there is one)
+ */
+int omap_gem_set_sync_object(struct drm_gem_object *obj, void *syncobj)
+{
+ struct omap_gem_object *omap_obj = to_omap_bo(obj);
+ int ret = 0;
+
+ spin_lock(&sync_lock);
+
+ if ((omap_obj->flags & OMAP_BO_EXT_SYNC) && !syncobj) {
+ /* clearing a previously set syncobj */
+ syncobj = kmemdup(omap_obj->sync, sizeof(*omap_obj->sync),
+ GFP_ATOMIC);
+ if (!syncobj) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+ omap_obj->flags &= ~OMAP_BO_EXT_SYNC;
+ omap_obj->sync = syncobj;
+ } else if (syncobj && !(omap_obj->flags & OMAP_BO_EXT_SYNC)) {
+ /* replacing an existing syncobj */
+ if (omap_obj->sync) {
+ memcpy(syncobj, omap_obj->sync, sizeof(*omap_obj->sync));
+ kfree(omap_obj->sync);
+ }
+ omap_obj->flags |= OMAP_BO_EXT_SYNC;
+ omap_obj->sync = syncobj;
+ }
+
+unlock:
+ spin_unlock(&sync_lock);
+ return ret;
+}
+
+/* don't call directly.. called from GEM core when it is time to actually
+ * free the object..
+ */
+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);
+
+ drm_gem_free_mmap_offset(obj);
+
+ /* this means the object is still pinned.. which really should
+ * not happen. I think..
+ */
+ WARN_ON(omap_obj->paddr_cnt > 0);
+
+ /* don't free externally allocated backing memory */
+ if (!(omap_obj->flags & OMAP_BO_EXT_MEM)) {
+ if (omap_obj->pages)
+ omap_gem_detach_pages(obj);
+
+ if (!is_shmem(obj)) {
+ dma_free_writecombine(dev->dev, obj->size,
+ omap_obj->vaddr, omap_obj->paddr);
+ } else if (omap_obj->vaddr) {
+ vunmap(omap_obj->vaddr);
+ }
+ }
+
+ /* don't free externally allocated syncobj */
+ if (!(omap_obj->flags & OMAP_BO_EXT_SYNC))
+ kfree(omap_obj->sync);
+
+ drm_gem_object_release(obj);
+
+ kfree(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) {
+ drm_gem_object_release(obj);
+ kfree(obj); /* TODO isn't there a dtor to call? just copying i915 */
+ return ret;
+ }
+
+ /* drop reference from allocate - handle holds it now */
+ drm_gem_object_unreference_unlocked(obj);
+
+ return 0;
+}
+
+/* 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 = NULL;
+ struct address_space *mapping;
+ size_t size;
+ int ret;
+
+ if (flags & OMAP_BO_TILED) {
+ if (!usergart) {
+ dev_err(dev->dev, "Tiled buffers require DMM\n");
+ goto fail;
+ }
+
+ /* tiled buffers are always shmem paged backed.. when they are
+ * scanned out, they are remapped into DMM/TILER
+ */
+ flags &= ~OMAP_BO_SCANOUT;
+
+ /* 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();
+
+ /* align dimensions to slot boundaries... */
+ tiler_align(gem2fmt(flags),
+ &gsize.tiled.width, &gsize.tiled.height);
+
+ /* ...and calculate size based on aligned dimensions */
+ size = tiler_size(gem2fmt(flags),
+ gsize.tiled.width, gsize.tiled.height);
+ } else {
+ size = PAGE_ALIGN(gsize.bytes);
+ }
+
+ omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
+ if (!omap_obj)
+ goto fail;
+
+ spin_lock(&priv->list_lock);
+ list_add(&omap_obj->mm_list, &priv->obj_list);
+ spin_unlock(&priv->list_lock);
+
+ obj = &omap_obj->base;
+
+ if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
+ /* attempt to allocate contiguous memory if we don't
+ * have DMM for remappign discontiguous buffers
+ */
+ omap_obj->vaddr = dma_alloc_writecombine(dev->dev, size,
+ &omap_obj->paddr, GFP_KERNEL);
+ if (omap_obj->vaddr)
+ flags |= OMAP_BO_DMA;
+
+ }
+
+ omap_obj->flags = flags;
+
+ if (flags & OMAP_BO_TILED) {
+ omap_obj->width = gsize.tiled.width;
+ omap_obj->height = gsize.tiled.height;
+ }
+
+ if (flags & (OMAP_BO_DMA|OMAP_BO_EXT_MEM)) {
+ drm_gem_private_object_init(dev, obj, size);
+ } else {
+ ret = drm_gem_object_init(dev, obj, size);
+ if (ret)
+ goto fail;
+
+ mapping = file_inode(obj->filp)->i_mapping;
+ mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
+ }
+
+ return obj;
+
+fail:
+ if (obj)
+ omap_gem_free_object(obj);
+
+ return NULL;
+}
+
+/* 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;
+ 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 usergart_entry *entry = &usergart[i].entry[j];
+ struct tiler_block *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->has_dmm = true;
+}
+
+void omap_gem_deinit(struct drm_device *dev)
+{
+ /* I believe we can rely on there being no more outstanding GEM
+ * objects which could depend on usergart/dmm at this point.
+ */
+ kfree(usergart);
+}
Code Review / kvmfornfv.git / blobdiff