# GEM (Graphics Execution Management) code
obj-y += gem/
gem-y += \
- gem/i915_gem_object.o
+ gem/i915_gem_object.o \
+ gem/i915_gem_shmem.o
i915-y += \
$(gem-y) \
i915_active.o \
#include "i915_drv.h"
#include "i915_gem_object.h"
#include "i915_globals.h"
+#include "intel_frontbuffer.h"
static struct i915_global_object {
struct i915_global base;
return kmem_cache_free(global.slab_objects, obj);
}
+/* some bookkeeping */
+static void i915_gem_info_add_obj(struct drm_i915_private *i915,
+ u64 size)
+{
+ spin_lock(&i915->mm.object_stat_lock);
+ i915->mm.object_count++;
+ i915->mm.object_memory += size;
+ spin_unlock(&i915->mm.object_stat_lock);
+}
+
+static void i915_gem_info_remove_obj(struct drm_i915_private *i915,
+ u64 size)
+{
+ spin_lock(&i915->mm.object_stat_lock);
+ i915->mm.object_count--;
+ i915->mm.object_memory -= size;
+ spin_unlock(&i915->mm.object_stat_lock);
+}
+
+static void
+frontbuffer_retire(struct i915_active_request *active,
+ struct i915_request *request)
+{
+ struct drm_i915_gem_object *obj =
+ container_of(active, typeof(*obj), frontbuffer_write);
+
+ intel_fb_obj_flush(obj, ORIGIN_CS);
+}
+
+void i915_gem_object_init(struct drm_i915_gem_object *obj,
+ const struct drm_i915_gem_object_ops *ops)
+{
+ mutex_init(&obj->mm.lock);
+
+ spin_lock_init(&obj->vma.lock);
+ INIT_LIST_HEAD(&obj->vma.list);
+
+ INIT_LIST_HEAD(&obj->lut_list);
+ INIT_LIST_HEAD(&obj->batch_pool_link);
+
+ init_rcu_head(&obj->rcu);
+
+ obj->ops = ops;
+
+ reservation_object_init(&obj->__builtin_resv);
+ obj->resv = &obj->__builtin_resv;
+
+ obj->frontbuffer_ggtt_origin = ORIGIN_GTT;
+ i915_active_request_init(&obj->frontbuffer_write,
+ NULL, frontbuffer_retire);
+
+ obj->mm.madv = I915_MADV_WILLNEED;
+ INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
+ mutex_init(&obj->mm.get_page.lock);
+
+ i915_gem_info_add_obj(to_i915(obj->base.dev), obj->base.size);
+}
+
/**
* Mark up the object's coherency levels for a given cache_level
* @obj: #drm_i915_gem_object
!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
}
+void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
+{
+ struct drm_i915_private *i915 = to_i915(gem->dev);
+ struct drm_i915_gem_object *obj = to_intel_bo(gem);
+ struct drm_i915_file_private *fpriv = file->driver_priv;
+ struct i915_lut_handle *lut, *ln;
+
+ mutex_lock(&i915->drm.struct_mutex);
+
+ list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
+ struct i915_gem_context *ctx = lut->ctx;
+ struct i915_vma *vma;
+
+ GEM_BUG_ON(ctx->file_priv == ERR_PTR(-EBADF));
+ if (ctx->file_priv != fpriv)
+ continue;
+
+ vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
+ GEM_BUG_ON(vma->obj != obj);
+
+ /* We allow the process to have multiple handles to the same
+ * vma, in the same fd namespace, by virtue of flink/open.
+ */
+ GEM_BUG_ON(!vma->open_count);
+ if (!--vma->open_count && !i915_vma_is_ggtt(vma))
+ i915_vma_close(vma);
+
+ list_del(&lut->obj_link);
+ list_del(&lut->ctx_link);
+
+ i915_lut_handle_free(lut);
+ __i915_gem_object_release_unless_active(obj);
+ }
+
+ mutex_unlock(&i915->drm.struct_mutex);
+}
+
+static bool discard_backing_storage(struct drm_i915_gem_object *obj)
+{
+ /* If we are the last user of the backing storage (be it shmemfs
+ * pages or stolen etc), we know that the pages are going to be
+ * immediately released. In this case, we can then skip copying
+ * back the contents from the GPU.
+ */
+
+ if (obj->mm.madv != I915_MADV_WILLNEED)
+ return false;
+
+ if (!obj->base.filp)
+ return true;
+
+ /* At first glance, this looks racy, but then again so would be
+ * userspace racing mmap against close. However, the first external
+ * reference to the filp can only be obtained through the
+ * i915_gem_mmap_ioctl() which safeguards us against the user
+ * acquiring such a reference whilst we are in the middle of
+ * freeing the object.
+ */
+ return file_count(obj->base.filp) == 1;
+}
+
+static void __i915_gem_free_objects(struct drm_i915_private *i915,
+ struct llist_node *freed)
+{
+ struct drm_i915_gem_object *obj, *on;
+ intel_wakeref_t wakeref;
+
+ wakeref = intel_runtime_pm_get(i915);
+ llist_for_each_entry_safe(obj, on, freed, freed) {
+ struct i915_vma *vma, *vn;
+
+ trace_i915_gem_object_destroy(obj);
+
+ mutex_lock(&i915->drm.struct_mutex);
+
+ GEM_BUG_ON(i915_gem_object_is_active(obj));
+ list_for_each_entry_safe(vma, vn, &obj->vma.list, obj_link) {
+ GEM_BUG_ON(i915_vma_is_active(vma));
+ vma->flags &= ~I915_VMA_PIN_MASK;
+ i915_vma_destroy(vma);
+ }
+ GEM_BUG_ON(!list_empty(&obj->vma.list));
+ GEM_BUG_ON(!RB_EMPTY_ROOT(&obj->vma.tree));
+
+ /* This serializes freeing with the shrinker. Since the free
+ * is delayed, first by RCU then by the workqueue, we want the
+ * shrinker to be able to free pages of unreferenced objects,
+ * or else we may oom whilst there are plenty of deferred
+ * freed objects.
+ */
+ if (i915_gem_object_has_pages(obj)) {
+ spin_lock(&i915->mm.obj_lock);
+ list_del_init(&obj->mm.link);
+ spin_unlock(&i915->mm.obj_lock);
+ }
+
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ GEM_BUG_ON(obj->bind_count);
+ GEM_BUG_ON(obj->userfault_count);
+ GEM_BUG_ON(atomic_read(&obj->frontbuffer_bits));
+ GEM_BUG_ON(!list_empty(&obj->lut_list));
+
+ if (obj->ops->release)
+ obj->ops->release(obj);
+
+ if (WARN_ON(i915_gem_object_has_pinned_pages(obj)))
+ atomic_set(&obj->mm.pages_pin_count, 0);
+ __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
+ GEM_BUG_ON(i915_gem_object_has_pages(obj));
+
+ if (obj->base.import_attach)
+ drm_prime_gem_destroy(&obj->base, NULL);
+
+ reservation_object_fini(&obj->__builtin_resv);
+ drm_gem_object_release(&obj->base);
+ i915_gem_info_remove_obj(i915, obj->base.size);
+
+ bitmap_free(obj->bit_17);
+ i915_gem_object_free(obj);
+
+ GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
+ atomic_dec(&i915->mm.free_count);
+
+ if (on)
+ cond_resched();
+ }
+ intel_runtime_pm_put(i915, wakeref);
+}
+
+void i915_gem_flush_free_objects(struct drm_i915_private *i915)
+{
+ struct llist_node *freed;
+
+ /* Free the oldest, most stale object to keep the free_list short */
+ freed = NULL;
+ if (!llist_empty(&i915->mm.free_list)) { /* quick test for hotpath */
+ /* Only one consumer of llist_del_first() allowed */
+ spin_lock(&i915->mm.free_lock);
+ freed = llist_del_first(&i915->mm.free_list);
+ spin_unlock(&i915->mm.free_lock);
+ }
+ if (unlikely(freed)) {
+ freed->next = NULL;
+ __i915_gem_free_objects(i915, freed);
+ }
+}
+
+static void __i915_gem_free_work(struct work_struct *work)
+{
+ struct drm_i915_private *i915 =
+ container_of(work, struct drm_i915_private, mm.free_work);
+ struct llist_node *freed;
+
+ /*
+ * All file-owned VMA should have been released by this point through
+ * i915_gem_close_object(), or earlier by i915_gem_context_close().
+ * However, the object may also be bound into the global GTT (e.g.
+ * older GPUs without per-process support, or for direct access through
+ * the GTT either for the user or for scanout). Those VMA still need to
+ * unbound now.
+ */
+
+ spin_lock(&i915->mm.free_lock);
+ while ((freed = llist_del_all(&i915->mm.free_list))) {
+ spin_unlock(&i915->mm.free_lock);
+
+ __i915_gem_free_objects(i915, freed);
+ if (need_resched())
+ return;
+
+ spin_lock(&i915->mm.free_lock);
+ }
+ spin_unlock(&i915->mm.free_lock);
+}
+
+static void __i915_gem_free_object_rcu(struct rcu_head *head)
+{
+ struct drm_i915_gem_object *obj =
+ container_of(head, typeof(*obj), rcu);
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+
+ /*
+ * We reuse obj->rcu for the freed list, so we had better not treat
+ * it like a rcu_head from this point forwards. And we expect all
+ * objects to be freed via this path.
+ */
+ destroy_rcu_head(&obj->rcu);
+
+ /*
+ * Since we require blocking on struct_mutex to unbind the freed
+ * object from the GPU before releasing resources back to the
+ * system, we can not do that directly from the RCU callback (which may
+ * be a softirq context), but must instead then defer that work onto a
+ * kthread. We use the RCU callback rather than move the freed object
+ * directly onto the work queue so that we can mix between using the
+ * worker and performing frees directly from subsequent allocations for
+ * crude but effective memory throttling.
+ */
+ if (llist_add(&obj->freed, &i915->mm.free_list))
+ queue_work(i915->wq, &i915->mm.free_work);
+}
+
+void i915_gem_free_object(struct drm_gem_object *gem_obj)
+{
+ struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
+
+ if (obj->mm.quirked)
+ __i915_gem_object_unpin_pages(obj);
+
+ if (discard_backing_storage(obj))
+ obj->mm.madv = I915_MADV_DONTNEED;
+
+ /*
+ * Before we free the object, make sure any pure RCU-only
+ * read-side critical sections are complete, e.g.
+ * i915_gem_busy_ioctl(). For the corresponding synchronized
+ * lookup see i915_gem_object_lookup_rcu().
+ */
+ atomic_inc(&to_i915(obj->base.dev)->mm.free_count);
+ call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
+}
+
+void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
+{
+ lockdep_assert_held(&obj->base.dev->struct_mutex);
+
+ if (!i915_gem_object_has_active_reference(obj) &&
+ i915_gem_object_is_active(obj))
+ i915_gem_object_set_active_reference(obj);
+ else
+ i915_gem_object_put(obj);
+}
+
+void i915_gem_init__objects(struct drm_i915_private *i915)
+{
+ INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
+}
+
static void i915_global_objects_shrink(void)
{
kmem_cache_shrink(global.slab_objects);
#include "i915_gem_object_types.h"
+void i915_gem_init__objects(struct drm_i915_private *i915);
+
struct drm_i915_gem_object *i915_gem_object_alloc(void);
void i915_gem_object_free(struct drm_i915_gem_object *obj);
+void i915_gem_object_init(struct drm_i915_gem_object *obj,
+ const struct drm_i915_gem_object_ops *ops);
+struct drm_i915_gem_object *
+i915_gem_object_create_shmem(struct drm_i915_private *i915, u64 size);
+struct drm_i915_gem_object *
+i915_gem_object_create_shmem_from_data(struct drm_i915_private *i915,
+ const void *data, size_t size);
+
+extern const struct drm_i915_gem_object_ops i915_gem_shmem_ops;
+void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
+ struct sg_table *pages,
+ bool needs_clflush);
+
+void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
+void i915_gem_free_object(struct drm_gem_object *obj);
+
+void i915_gem_flush_free_objects(struct drm_i915_private *i915);
+
/**
* i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle
* @filp: DRM file private date
unsigned int cache_level);
void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj);
-void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
- struct sg_table *pages,
- bool needs_clflush);
+static inline bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
+{
+ if (obj->cache_dirty)
+ return false;
+
+ if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
+ return true;
+
+ return obj->pin_global; /* currently in use by HW, keep flushed */
+}
+
+static inline void __start_cpu_write(struct drm_i915_gem_object *obj)
+{
+ obj->read_domains = I915_GEM_DOMAIN_CPU;
+ obj->write_domain = I915_GEM_DOMAIN_CPU;
+ if (cpu_write_needs_clflush(obj))
+ obj->cache_dirty = true;
+}
#endif
--- /dev/null
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2014-2016 Intel Corporation
+ */
+
+#include <linux/pagevec.h>
+#include <linux/swap.h>
+
+#include "i915_drv.h"
+#include "i915_gem_object.h"
+
+/*
+ * Move pages to appropriate lru and release the pagevec, decrementing the
+ * ref count of those pages.
+ */
+static void check_release_pagevec(struct pagevec *pvec)
+{
+ check_move_unevictable_pages(pvec);
+ __pagevec_release(pvec);
+ cond_resched();
+}
+
+static int shmem_get_pages(struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+ const unsigned long page_count = obj->base.size / PAGE_SIZE;
+ unsigned long i;
+ struct address_space *mapping;
+ struct sg_table *st;
+ struct scatterlist *sg;
+ struct sgt_iter sgt_iter;
+ struct page *page;
+ unsigned long last_pfn = 0; /* suppress gcc warning */
+ unsigned int max_segment = i915_sg_segment_size();
+ unsigned int sg_page_sizes;
+ struct pagevec pvec;
+ gfp_t noreclaim;
+ int ret;
+
+ /*
+ * Assert that the object is not currently in any GPU domain. As it
+ * wasn't in the GTT, there shouldn't be any way it could have been in
+ * a GPU cache
+ */
+ GEM_BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
+ GEM_BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
+
+ /*
+ * If there's no chance of allocating enough pages for the whole
+ * object, bail early.
+ */
+ if (page_count > totalram_pages())
+ return -ENOMEM;
+
+ st = kmalloc(sizeof(*st), GFP_KERNEL);
+ if (!st)
+ return -ENOMEM;
+
+rebuild_st:
+ if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
+ kfree(st);
+ return -ENOMEM;
+ }
+
+ /*
+ * Get the list of pages out of our struct file. They'll be pinned
+ * at this point until we release them.
+ *
+ * Fail silently without starting the shrinker
+ */
+ mapping = obj->base.filp->f_mapping;
+ mapping_set_unevictable(mapping);
+ noreclaim = mapping_gfp_constraint(mapping, ~__GFP_RECLAIM);
+ noreclaim |= __GFP_NORETRY | __GFP_NOWARN;
+
+ sg = st->sgl;
+ st->nents = 0;
+ sg_page_sizes = 0;
+ for (i = 0; i < page_count; i++) {
+ const unsigned int shrink[] = {
+ (I915_SHRINK_BOUND |
+ I915_SHRINK_UNBOUND |
+ I915_SHRINK_PURGEABLE),
+ 0,
+ }, *s = shrink;
+ gfp_t gfp = noreclaim;
+
+ do {
+ cond_resched();
+ page = shmem_read_mapping_page_gfp(mapping, i, gfp);
+ if (!IS_ERR(page))
+ break;
+
+ if (!*s) {
+ ret = PTR_ERR(page);
+ goto err_sg;
+ }
+
+ i915_gem_shrink(i915, 2 * page_count, NULL, *s++);
+
+ /*
+ * We've tried hard to allocate the memory by reaping
+ * our own buffer, now let the real VM do its job and
+ * go down in flames if truly OOM.
+ *
+ * However, since graphics tend to be disposable,
+ * defer the oom here by reporting the ENOMEM back
+ * to userspace.
+ */
+ if (!*s) {
+ /* reclaim and warn, but no oom */
+ gfp = mapping_gfp_mask(mapping);
+
+ /*
+ * Our bo are always dirty and so we require
+ * kswapd to reclaim our pages (direct reclaim
+ * does not effectively begin pageout of our
+ * buffers on its own). However, direct reclaim
+ * only waits for kswapd when under allocation
+ * congestion. So as a result __GFP_RECLAIM is
+ * unreliable and fails to actually reclaim our
+ * dirty pages -- unless you try over and over
+ * again with !__GFP_NORETRY. However, we still
+ * want to fail this allocation rather than
+ * trigger the out-of-memory killer and for
+ * this we want __GFP_RETRY_MAYFAIL.
+ */
+ gfp |= __GFP_RETRY_MAYFAIL;
+ }
+ } while (1);
+
+ if (!i ||
+ sg->length >= max_segment ||
+ page_to_pfn(page) != last_pfn + 1) {
+ if (i) {
+ sg_page_sizes |= sg->length;
+ sg = sg_next(sg);
+ }
+ st->nents++;
+ sg_set_page(sg, page, PAGE_SIZE, 0);
+ } else {
+ sg->length += PAGE_SIZE;
+ }
+ last_pfn = page_to_pfn(page);
+
+ /* Check that the i965g/gm workaround works. */
+ WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
+ }
+ if (sg) { /* loop terminated early; short sg table */
+ sg_page_sizes |= sg->length;
+ sg_mark_end(sg);
+ }
+
+ /* Trim unused sg entries to avoid wasting memory. */
+ i915_sg_trim(st);
+
+ ret = i915_gem_gtt_prepare_pages(obj, st);
+ if (ret) {
+ /*
+ * DMA remapping failed? One possible cause is that
+ * it could not reserve enough large entries, asking
+ * for PAGE_SIZE chunks instead may be helpful.
+ */
+ if (max_segment > PAGE_SIZE) {
+ for_each_sgt_page(page, sgt_iter, st)
+ put_page(page);
+ sg_free_table(st);
+
+ max_segment = PAGE_SIZE;
+ goto rebuild_st;
+ } else {
+ dev_warn(&i915->drm.pdev->dev,
+ "Failed to DMA remap %lu pages\n",
+ page_count);
+ goto err_pages;
+ }
+ }
+
+ if (i915_gem_object_needs_bit17_swizzle(obj))
+ i915_gem_object_do_bit_17_swizzle(obj, st);
+
+ __i915_gem_object_set_pages(obj, st, sg_page_sizes);
+
+ return 0;
+
+err_sg:
+ sg_mark_end(sg);
+err_pages:
+ mapping_clear_unevictable(mapping);
+ pagevec_init(&pvec);
+ for_each_sgt_page(page, sgt_iter, st) {
+ if (!pagevec_add(&pvec, page))
+ check_release_pagevec(&pvec);
+ }
+ if (pagevec_count(&pvec))
+ check_release_pagevec(&pvec);
+ sg_free_table(st);
+ kfree(st);
+
+ /*
+ * shmemfs first checks if there is enough memory to allocate the page
+ * and reports ENOSPC should there be insufficient, along with the usual
+ * ENOMEM for a genuine allocation failure.
+ *
+ * We use ENOSPC in our driver to mean that we have run out of aperture
+ * space and so want to translate the error from shmemfs back to our
+ * usual understanding of ENOMEM.
+ */
+ if (ret == -ENOSPC)
+ ret = -ENOMEM;
+
+ return ret;
+}
+
+void
+__i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
+ struct sg_table *pages,
+ bool needs_clflush)
+{
+ GEM_BUG_ON(obj->mm.madv == __I915_MADV_PURGED);
+
+ if (obj->mm.madv == I915_MADV_DONTNEED)
+ obj->mm.dirty = false;
+
+ if (needs_clflush &&
+ (obj->read_domains & I915_GEM_DOMAIN_CPU) == 0 &&
+ !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
+ drm_clflush_sg(pages);
+
+ __start_cpu_write(obj);
+}
+
+static void
+shmem_put_pages(struct drm_i915_gem_object *obj, struct sg_table *pages)
+{
+ struct sgt_iter sgt_iter;
+ struct pagevec pvec;
+ struct page *page;
+
+ __i915_gem_object_release_shmem(obj, pages, true);
+
+ i915_gem_gtt_finish_pages(obj, pages);
+
+ if (i915_gem_object_needs_bit17_swizzle(obj))
+ i915_gem_object_save_bit_17_swizzle(obj, pages);
+
+ mapping_clear_unevictable(file_inode(obj->base.filp)->i_mapping);
+
+ pagevec_init(&pvec);
+ for_each_sgt_page(page, sgt_iter, pages) {
+ if (obj->mm.dirty)
+ set_page_dirty(page);
+
+ if (obj->mm.madv == I915_MADV_WILLNEED)
+ mark_page_accessed(page);
+
+ if (!pagevec_add(&pvec, page))
+ check_release_pagevec(&pvec);
+ }
+ if (pagevec_count(&pvec))
+ check_release_pagevec(&pvec);
+ obj->mm.dirty = false;
+
+ sg_free_table(pages);
+ kfree(pages);
+}
+
+static int
+shmem_pwrite(struct drm_i915_gem_object *obj,
+ const struct drm_i915_gem_pwrite *arg)
+{
+ struct address_space *mapping = obj->base.filp->f_mapping;
+ char __user *user_data = u64_to_user_ptr(arg->data_ptr);
+ u64 remain, offset;
+ unsigned int pg;
+
+ /* Caller already validated user args */
+ GEM_BUG_ON(!access_ok(user_data, arg->size));
+
+ /*
+ * Before we instantiate/pin the backing store for our use, we
+ * can prepopulate the shmemfs filp efficiently using a write into
+ * the pagecache. We avoid the penalty of instantiating all the
+ * pages, important if the user is just writing to a few and never
+ * uses the object on the GPU, and using a direct write into shmemfs
+ * allows it to avoid the cost of retrieving a page (either swapin
+ * or clearing-before-use) before it is overwritten.
+ */
+ if (i915_gem_object_has_pages(obj))
+ return -ENODEV;
+
+ if (obj->mm.madv != I915_MADV_WILLNEED)
+ return -EFAULT;
+
+ /*
+ * Before the pages are instantiated the object is treated as being
+ * in the CPU domain. The pages will be clflushed as required before
+ * use, and we can freely write into the pages directly. If userspace
+ * races pwrite with any other operation; corruption will ensue -
+ * that is userspace's prerogative!
+ */
+
+ remain = arg->size;
+ offset = arg->offset;
+ pg = offset_in_page(offset);
+
+ do {
+ unsigned int len, unwritten;
+ struct page *page;
+ void *data, *vaddr;
+ int err;
+ char c;
+
+ len = PAGE_SIZE - pg;
+ if (len > remain)
+ len = remain;
+
+ /* Prefault the user page to reduce potential recursion */
+ err = __get_user(c, user_data);
+ if (err)
+ return err;
+
+ err = __get_user(c, user_data + len - 1);
+ if (err)
+ return err;
+
+ err = pagecache_write_begin(obj->base.filp, mapping,
+ offset, len, 0,
+ &page, &data);
+ if (err < 0)
+ return err;
+
+ vaddr = kmap_atomic(page);
+ unwritten = __copy_from_user_inatomic(vaddr + pg,
+ user_data,
+ len);
+ kunmap_atomic(vaddr);
+
+ err = pagecache_write_end(obj->base.filp, mapping,
+ offset, len, len - unwritten,
+ page, data);
+ if (err < 0)
+ return err;
+
+ /* We don't handle -EFAULT, leave it to the caller to check */
+ if (unwritten)
+ return -ENODEV;
+
+ remain -= len;
+ user_data += len;
+ offset += len;
+ pg = 0;
+ } while (remain);
+
+ return 0;
+}
+
+const struct drm_i915_gem_object_ops i915_gem_shmem_ops = {
+ .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
+ I915_GEM_OBJECT_IS_SHRINKABLE,
+
+ .get_pages = shmem_get_pages,
+ .put_pages = shmem_put_pages,
+
+ .pwrite = shmem_pwrite,
+};
+
+static int create_shmem(struct drm_i915_private *i915,
+ struct drm_gem_object *obj,
+ size_t size)
+{
+ unsigned long flags = VM_NORESERVE;
+ struct file *filp;
+
+ drm_gem_private_object_init(&i915->drm, obj, size);
+
+ if (i915->mm.gemfs)
+ filp = shmem_file_setup_with_mnt(i915->mm.gemfs, "i915", size,
+ flags);
+ else
+ filp = shmem_file_setup("i915", size, flags);
+ if (IS_ERR(filp))
+ return PTR_ERR(filp);
+
+ obj->filp = filp;
+ return 0;
+}
+
+struct drm_i915_gem_object *
+i915_gem_object_create_shmem(struct drm_i915_private *i915, u64 size)
+{
+ struct drm_i915_gem_object *obj;
+ struct address_space *mapping;
+ unsigned int cache_level;
+ gfp_t mask;
+ int ret;
+
+ /* There is a prevalence of the assumption that we fit the object's
+ * page count inside a 32bit _signed_ variable. Let's document this and
+ * catch if we ever need to fix it. In the meantime, if you do spot
+ * such a local variable, please consider fixing!
+ */
+ if (size >> PAGE_SHIFT > INT_MAX)
+ return ERR_PTR(-E2BIG);
+
+ if (overflows_type(size, obj->base.size))
+ return ERR_PTR(-E2BIG);
+
+ obj = i915_gem_object_alloc();
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ ret = create_shmem(i915, &obj->base, size);
+ if (ret)
+ goto fail;
+
+ mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
+ if (IS_I965GM(i915) || IS_I965G(i915)) {
+ /* 965gm cannot relocate objects above 4GiB. */
+ mask &= ~__GFP_HIGHMEM;
+ mask |= __GFP_DMA32;
+ }
+
+ mapping = obj->base.filp->f_mapping;
+ mapping_set_gfp_mask(mapping, mask);
+ GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
+
+ i915_gem_object_init(obj, &i915_gem_shmem_ops);
+
+ obj->write_domain = I915_GEM_DOMAIN_CPU;
+ obj->read_domains = I915_GEM_DOMAIN_CPU;
+
+ if (HAS_LLC(i915))
+ /* On some devices, we can have the GPU use the LLC (the CPU
+ * cache) for about a 10% performance improvement
+ * compared to uncached. Graphics requests other than
+ * display scanout are coherent with the CPU in
+ * accessing this cache. This means in this mode we
+ * don't need to clflush on the CPU side, and on the
+ * GPU side we only need to flush internal caches to
+ * get data visible to the CPU.
+ *
+ * However, we maintain the display planes as UC, and so
+ * need to rebind when first used as such.
+ */
+ cache_level = I915_CACHE_LLC;
+ else
+ cache_level = I915_CACHE_NONE;
+
+ i915_gem_object_set_cache_coherency(obj, cache_level);
+
+ trace_i915_gem_object_create(obj);
+
+ return obj;
+
+fail:
+ i915_gem_object_free(obj);
+ return ERR_PTR(ret);
+}
+
+/* Allocate a new GEM object and fill it with the supplied data */
+struct drm_i915_gem_object *
+i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv,
+ const void *data, size_t size)
+{
+ struct drm_i915_gem_object *obj;
+ struct file *file;
+ size_t offset;
+ int err;
+
+ obj = i915_gem_object_create_shmem(dev_priv, round_up(size, PAGE_SIZE));
+ if (IS_ERR(obj))
+ return obj;
+
+ GEM_BUG_ON(obj->write_domain != I915_GEM_DOMAIN_CPU);
+
+ file = obj->base.filp;
+ offset = 0;
+ do {
+ unsigned int len = min_t(typeof(size), size, PAGE_SIZE);
+ struct page *page;
+ void *pgdata, *vaddr;
+
+ err = pagecache_write_begin(file, file->f_mapping,
+ offset, len, 0,
+ &page, &pgdata);
+ if (err < 0)
+ goto fail;
+
+ vaddr = kmap(page);
+ memcpy(vaddr, data, len);
+ kunmap(page);
+
+ err = pagecache_write_end(file, file->f_mapping,
+ offset, len, len,
+ page, pgdata);
+ if (err < 0)
+ goto fail;
+
+ size -= len;
+ data += len;
+ offset += len;
+ } while (size);
+
+ return obj;
+
+fail:
+ i915_gem_object_put(obj);
+ return ERR_PTR(err);
+}
struct i915_vma *vma;
int err;
- obj = i915_gem_object_create(engine->i915, CTX_WA_BB_OBJ_SIZE);
+ obj = i915_gem_object_create_shmem(engine->i915, CTX_WA_BB_OBJ_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
*/
context_size += LRC_HEADER_PAGES * PAGE_SIZE;
- ctx_obj = i915_gem_object_create(engine->i915, context_size);
+ ctx_obj = i915_gem_object_create_shmem(engine->i915, context_size);
if (IS_ERR(ctx_obj))
return PTR_ERR(ctx_obj);
struct i915_vma *vma;
int err;
- obj = i915_gem_object_create(i915, engine->context_size);
+ obj = i915_gem_object_create_shmem(i915, engine->context_size);
if (IS_ERR(obj))
return ERR_CAST(obj);
int ret = 0;
struct intel_vgpu_mm *mm = (s->buf_addr_type == GTT_BUFFER) ?
s->vgpu->gtt.ggtt_mm : s->workload->shadow_mm;
- unsigned long gma_start_offset = 0;
+ unsigned long start_offset = 0;
/* get the start gm address of the batch buffer */
gma = get_gma_bb_from_cmd(s, 1);
bb->ppgtt = (s->buf_addr_type == GTT_BUFFER) ? false : true;
- /* the gma_start_offset stores the batch buffer's start gma's
+ /* the start_offset stores the batch buffer's start gma's
* offset relative to page boundary. so for non-privileged batch
* buffer, the shadowed gem object holds exactly the same page
* layout as original gem object. This is for the convience of
* that of shadowed page.
*/
if (bb->ppgtt)
- gma_start_offset = gma & ~I915_GTT_PAGE_MASK;
+ start_offset = gma & ~I915_GTT_PAGE_MASK;
- bb->obj = i915_gem_object_create(s->vgpu->gvt->dev_priv,
- roundup(bb_size + gma_start_offset, PAGE_SIZE));
+ bb->obj = i915_gem_object_create_shmem(s->vgpu->gvt->dev_priv,
+ round_up(bb_size + start_offset,
+ PAGE_SIZE));
if (IS_ERR(bb->obj)) {
ret = PTR_ERR(bb->obj);
goto err_free_bb;
ret = copy_gma_to_hva(s->vgpu, mm,
gma, gma + bb_size,
- bb->va + gma_start_offset);
+ bb->va + start_offset);
if (ret < 0) {
gvt_vgpu_err("fail to copy guest ring buffer\n");
ret = -EFAULT;
* buffer's gma in pair. After all, we don't want to pin the shadow
* buffer here (too early).
*/
- s->ip_va = bb->va + gma_start_offset;
+ s->ip_va = bb->va + start_offset;
s->ip_gma = gma;
return 0;
err_unmap:
int ret = 0;
void *map;
- obj = i915_gem_object_create(workload->vgpu->gvt->dev_priv,
- roundup(ctx_size + CACHELINE_BYTES,
- PAGE_SIZE));
+ obj = i915_gem_object_create_shmem(workload->vgpu->gvt->dev_priv,
+ roundup(ctx_size + CACHELINE_BYTES,
+ PAGE_SIZE));
if (IS_ERR(obj))
return PTR_ERR(obj);
int i915_gem_freeze(struct drm_i915_private *dev_priv);
int i915_gem_freeze_late(struct drm_i915_private *dev_priv);
-void i915_gem_object_init(struct drm_i915_gem_object *obj,
- const struct drm_i915_gem_object_ops *ops);
-struct drm_i915_gem_object *
-i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size);
-struct drm_i915_gem_object *
-i915_gem_object_create_from_data(struct drm_i915_private *dev_priv,
- const void *data, size_t size);
-void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
-void i915_gem_free_object(struct drm_gem_object *obj);
-
static inline void i915_gem_drain_freed_objects(struct drm_i915_private *i915)
{
if (!atomic_read(&i915->mm.free_count))
#include "intel_frontbuffer.h"
#include "intel_pm.h"
-static void i915_gem_flush_free_objects(struct drm_i915_private *i915);
-
-static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
-{
- if (obj->cache_dirty)
- return false;
-
- if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
- return true;
-
- return obj->pin_global; /* currently in use by HW, keep flushed */
-}
-
static int
insert_mappable_node(struct i915_ggtt *ggtt,
struct drm_mm_node *node, u32 size)
drm_mm_remove_node(node);
}
-/* some bookkeeping */
-static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
- u64 size)
-{
- spin_lock(&dev_priv->mm.object_stat_lock);
- dev_priv->mm.object_count++;
- dev_priv->mm.object_memory += size;
- spin_unlock(&dev_priv->mm.object_stat_lock);
-}
-
-static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
- u64 size)
-{
- spin_lock(&dev_priv->mm.object_stat_lock);
- dev_priv->mm.object_count--;
- dev_priv->mm.object_memory -= size;
- spin_unlock(&dev_priv->mm.object_stat_lock);
-}
-
int
i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
return err;
}
-static void __start_cpu_write(struct drm_i915_gem_object *obj)
-{
- obj->read_domains = I915_GEM_DOMAIN_CPU;
- obj->write_domain = I915_GEM_DOMAIN_CPU;
- if (cpu_write_needs_clflush(obj))
- obj->cache_dirty = true;
-}
-
-void
-__i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
- struct sg_table *pages,
- bool needs_clflush)
-{
- GEM_BUG_ON(obj->mm.madv == __I915_MADV_PURGED);
-
- if (obj->mm.madv == I915_MADV_DONTNEED)
- obj->mm.dirty = false;
-
- if (needs_clflush &&
- (obj->read_domains & I915_GEM_DOMAIN_CPU) == 0 &&
- !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
- drm_clflush_sg(pages);
-
- __start_cpu_write(obj);
-}
-
static void
i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
struct sg_table *pages)
.release = i915_gem_object_release_phys,
};
-static const struct drm_i915_gem_object_ops i915_gem_object_ops;
-
int i915_gem_object_unbind(struct drm_i915_gem_object *obj)
{
struct i915_vma *vma;
return -EINVAL;
/* Allocate the new object */
- obj = i915_gem_object_create(dev_priv, size);
+ obj = i915_gem_object_create_shmem(dev_priv, size);
if (IS_ERR(obj))
return PTR_ERR(obj);
obj->mm.pages = ERR_PTR(-EFAULT);
}
-/*
- * Move pages to appropriate lru and release the pagevec, decrementing the
- * ref count of those pages.
- */
-static void check_release_pagevec(struct pagevec *pvec)
-{
- check_move_unevictable_pages(pvec);
- __pagevec_release(pvec);
- cond_resched();
-}
-
-static void
-i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj,
- struct sg_table *pages)
-{
- struct sgt_iter sgt_iter;
- struct pagevec pvec;
- struct page *page;
-
- __i915_gem_object_release_shmem(obj, pages, true);
- i915_gem_gtt_finish_pages(obj, pages);
-
- if (i915_gem_object_needs_bit17_swizzle(obj))
- i915_gem_object_save_bit_17_swizzle(obj, pages);
-
- mapping_clear_unevictable(file_inode(obj->base.filp)->i_mapping);
-
- pagevec_init(&pvec);
- for_each_sgt_page(page, sgt_iter, pages) {
- if (obj->mm.dirty)
- set_page_dirty(page);
-
- if (obj->mm.madv == I915_MADV_WILLNEED)
- mark_page_accessed(page);
-
- if (!pagevec_add(&pvec, page))
- check_release_pagevec(&pvec);
- }
- if (pagevec_count(&pvec))
- check_release_pagevec(&pvec);
- obj->mm.dirty = false;
-
- sg_free_table(pages);
- kfree(pages);
-}
-
static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
{
struct radix_tree_iter iter;
return true;
}
-static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
- const unsigned long page_count = obj->base.size / PAGE_SIZE;
- unsigned long i;
- struct address_space *mapping;
- struct sg_table *st;
- struct scatterlist *sg;
- struct sgt_iter sgt_iter;
- struct page *page;
- unsigned long last_pfn = 0; /* suppress gcc warning */
- unsigned int max_segment = i915_sg_segment_size();
- unsigned int sg_page_sizes;
- struct pagevec pvec;
- gfp_t noreclaim;
- int ret;
-
- /*
- * Assert that the object is not currently in any GPU domain. As it
- * wasn't in the GTT, there shouldn't be any way it could have been in
- * a GPU cache
- */
- GEM_BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
- GEM_BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
-
- /*
- * If there's no chance of allocating enough pages for the whole
- * object, bail early.
- */
- if (page_count > totalram_pages())
- return -ENOMEM;
-
- st = kmalloc(sizeof(*st), GFP_KERNEL);
- if (st == NULL)
- return -ENOMEM;
-
-rebuild_st:
- if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
- kfree(st);
- return -ENOMEM;
- }
-
- /*
- * Get the list of pages out of our struct file. They'll be pinned
- * at this point until we release them.
- *
- * Fail silently without starting the shrinker
- */
- mapping = obj->base.filp->f_mapping;
- mapping_set_unevictable(mapping);
- noreclaim = mapping_gfp_constraint(mapping, ~__GFP_RECLAIM);
- noreclaim |= __GFP_NORETRY | __GFP_NOWARN;
-
- sg = st->sgl;
- st->nents = 0;
- sg_page_sizes = 0;
- for (i = 0; i < page_count; i++) {
- const unsigned int shrink[] = {
- I915_SHRINK_BOUND | I915_SHRINK_UNBOUND | I915_SHRINK_PURGEABLE,
- 0,
- }, *s = shrink;
- gfp_t gfp = noreclaim;
-
- do {
- cond_resched();
- page = shmem_read_mapping_page_gfp(mapping, i, gfp);
- if (!IS_ERR(page))
- break;
-
- if (!*s) {
- ret = PTR_ERR(page);
- goto err_sg;
- }
-
- i915_gem_shrink(dev_priv, 2 * page_count, NULL, *s++);
-
- /*
- * We've tried hard to allocate the memory by reaping
- * our own buffer, now let the real VM do its job and
- * go down in flames if truly OOM.
- *
- * However, since graphics tend to be disposable,
- * defer the oom here by reporting the ENOMEM back
- * to userspace.
- */
- if (!*s) {
- /* reclaim and warn, but no oom */
- gfp = mapping_gfp_mask(mapping);
-
- /*
- * Our bo are always dirty and so we require
- * kswapd to reclaim our pages (direct reclaim
- * does not effectively begin pageout of our
- * buffers on its own). However, direct reclaim
- * only waits for kswapd when under allocation
- * congestion. So as a result __GFP_RECLAIM is
- * unreliable and fails to actually reclaim our
- * dirty pages -- unless you try over and over
- * again with !__GFP_NORETRY. However, we still
- * want to fail this allocation rather than
- * trigger the out-of-memory killer and for
- * this we want __GFP_RETRY_MAYFAIL.
- */
- gfp |= __GFP_RETRY_MAYFAIL;
- }
- } while (1);
-
- if (!i ||
- sg->length >= max_segment ||
- page_to_pfn(page) != last_pfn + 1) {
- if (i) {
- sg_page_sizes |= sg->length;
- sg = sg_next(sg);
- }
- st->nents++;
- sg_set_page(sg, page, PAGE_SIZE, 0);
- } else {
- sg->length += PAGE_SIZE;
- }
- last_pfn = page_to_pfn(page);
-
- /* Check that the i965g/gm workaround works. */
- WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
- }
- if (sg) { /* loop terminated early; short sg table */
- sg_page_sizes |= sg->length;
- sg_mark_end(sg);
- }
-
- /* Trim unused sg entries to avoid wasting memory. */
- i915_sg_trim(st);
-
- ret = i915_gem_gtt_prepare_pages(obj, st);
- if (ret) {
- /*
- * DMA remapping failed? One possible cause is that
- * it could not reserve enough large entries, asking
- * for PAGE_SIZE chunks instead may be helpful.
- */
- if (max_segment > PAGE_SIZE) {
- for_each_sgt_page(page, sgt_iter, st)
- put_page(page);
- sg_free_table(st);
-
- max_segment = PAGE_SIZE;
- goto rebuild_st;
- } else {
- dev_warn(&dev_priv->drm.pdev->dev,
- "Failed to DMA remap %lu pages\n",
- page_count);
- goto err_pages;
- }
- }
-
- if (i915_gem_object_needs_bit17_swizzle(obj))
- i915_gem_object_do_bit_17_swizzle(obj, st);
-
- __i915_gem_object_set_pages(obj, st, sg_page_sizes);
-
- return 0;
-
-err_sg:
- sg_mark_end(sg);
-err_pages:
- mapping_clear_unevictable(mapping);
- pagevec_init(&pvec);
- for_each_sgt_page(page, sgt_iter, st) {
- if (!pagevec_add(&pvec, page))
- check_release_pagevec(&pvec);
- }
- if (pagevec_count(&pvec))
- check_release_pagevec(&pvec);
- sg_free_table(st);
- kfree(st);
-
- /*
- * shmemfs first checks if there is enough memory to allocate the page
- * and reports ENOSPC should there be insufficient, along with the usual
- * ENOMEM for a genuine allocation failure.
- *
- * We use ENOSPC in our driver to mean that we have run out of aperture
- * space and so want to translate the error from shmemfs back to our
- * usual understanding of ENOMEM.
- */
- if (ret == -ENOSPC)
- ret = -ENOMEM;
-
- return ret;
-}
-
void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,
struct sg_table *pages,
unsigned int sg_page_sizes)
}
}
-static int
-i915_gem_object_pwrite_gtt(struct drm_i915_gem_object *obj,
- const struct drm_i915_gem_pwrite *arg)
-{
- struct address_space *mapping = obj->base.filp->f_mapping;
- char __user *user_data = u64_to_user_ptr(arg->data_ptr);
- u64 remain, offset;
- unsigned int pg;
-
- /* Caller already validated user args */
- GEM_BUG_ON(!access_ok(user_data, arg->size));
-
- /*
- * Before we instantiate/pin the backing store for our use, we
- * can prepopulate the shmemfs filp efficiently using a write into
- * the pagecache. We avoid the penalty of instantiating all the
- * pages, important if the user is just writing to a few and never
- * uses the object on the GPU, and using a direct write into shmemfs
- * allows it to avoid the cost of retrieving a page (either swapin
- * or clearing-before-use) before it is overwritten.
- */
- if (i915_gem_object_has_pages(obj))
- return -ENODEV;
-
- if (obj->mm.madv != I915_MADV_WILLNEED)
- return -EFAULT;
-
- /*
- * Before the pages are instantiated the object is treated as being
- * in the CPU domain. The pages will be clflushed as required before
- * use, and we can freely write into the pages directly. If userspace
- * races pwrite with any other operation; corruption will ensue -
- * that is userspace's prerogative!
- */
-
- remain = arg->size;
- offset = arg->offset;
- pg = offset_in_page(offset);
-
- do {
- unsigned int len, unwritten;
- struct page *page;
- void *data, *vaddr;
- int err;
- char c;
-
- len = PAGE_SIZE - pg;
- if (len > remain)
- len = remain;
-
- /* Prefault the user page to reduce potential recursion */
- err = __get_user(c, user_data);
- if (err)
- return err;
-
- err = __get_user(c, user_data + len - 1);
- if (err)
- return err;
-
- err = pagecache_write_begin(obj->base.filp, mapping,
- offset, len, 0,
- &page, &data);
- if (err < 0)
- return err;
-
- vaddr = kmap_atomic(page);
- unwritten = __copy_from_user_inatomic(vaddr + pg,
- user_data,
- len);
- kunmap_atomic(vaddr);
-
- err = pagecache_write_end(obj->base.filp, mapping,
- offset, len, len - unwritten,
- page, data);
- if (err < 0)
- return err;
-
- /* We don't handle -EFAULT, leave it to the caller to check */
- if (unwritten)
- return -ENODEV;
-
- remain -= len;
- user_data += len;
- offset += len;
- pg = 0;
- } while (remain);
-
- return 0;
-}
-
-void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
-{
- struct drm_i915_private *i915 = to_i915(gem->dev);
- struct drm_i915_gem_object *obj = to_intel_bo(gem);
- struct drm_i915_file_private *fpriv = file->driver_priv;
- struct i915_lut_handle *lut, *ln;
-
- mutex_lock(&i915->drm.struct_mutex);
-
- list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
- struct i915_gem_context *ctx = lut->ctx;
- struct i915_vma *vma;
-
- GEM_BUG_ON(ctx->file_priv == ERR_PTR(-EBADF));
- if (ctx->file_priv != fpriv)
- continue;
-
- vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
- GEM_BUG_ON(vma->obj != obj);
-
- /* We allow the process to have multiple handles to the same
- * vma, in the same fd namespace, by virtue of flink/open.
- */
- GEM_BUG_ON(!vma->open_count);
- if (!--vma->open_count && !i915_vma_is_ggtt(vma))
- i915_vma_close(vma);
-
- list_del(&lut->obj_link);
- list_del(&lut->ctx_link);
-
- i915_lut_handle_free(lut);
- __i915_gem_object_release_unless_active(obj);
- }
-
- mutex_unlock(&i915->drm.struct_mutex);
-}
-
static unsigned long to_wait_timeout(s64 timeout_ns)
{
if (timeout_ns < 0)
return err;
}
-static void
-frontbuffer_retire(struct i915_active_request *active,
- struct i915_request *request)
-{
- struct drm_i915_gem_object *obj =
- container_of(active, typeof(*obj), frontbuffer_write);
-
- intel_fb_obj_flush(obj, ORIGIN_CS);
-}
-
-void i915_gem_object_init(struct drm_i915_gem_object *obj,
- const struct drm_i915_gem_object_ops *ops)
-{
- mutex_init(&obj->mm.lock);
-
- spin_lock_init(&obj->vma.lock);
- INIT_LIST_HEAD(&obj->vma.list);
-
- INIT_LIST_HEAD(&obj->lut_list);
- INIT_LIST_HEAD(&obj->batch_pool_link);
-
- init_rcu_head(&obj->rcu);
-
- obj->ops = ops;
-
- reservation_object_init(&obj->__builtin_resv);
- obj->resv = &obj->__builtin_resv;
-
- obj->frontbuffer_ggtt_origin = ORIGIN_GTT;
- i915_active_request_init(&obj->frontbuffer_write,
- NULL, frontbuffer_retire);
-
- obj->mm.madv = I915_MADV_WILLNEED;
- INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
- mutex_init(&obj->mm.get_page.lock);
-
- i915_gem_info_add_obj(to_i915(obj->base.dev), obj->base.size);
-}
-
-static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
- .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
- I915_GEM_OBJECT_IS_SHRINKABLE,
-
- .get_pages = i915_gem_object_get_pages_gtt,
- .put_pages = i915_gem_object_put_pages_gtt,
-
- .pwrite = i915_gem_object_pwrite_gtt,
-};
-
-static int i915_gem_object_create_shmem(struct drm_device *dev,
- struct drm_gem_object *obj,
- size_t size)
-{
- struct drm_i915_private *i915 = to_i915(dev);
- unsigned long flags = VM_NORESERVE;
- struct file *filp;
-
- drm_gem_private_object_init(dev, obj, size);
-
- if (i915->mm.gemfs)
- filp = shmem_file_setup_with_mnt(i915->mm.gemfs, "i915", size,
- flags);
- else
- filp = shmem_file_setup("i915", size, flags);
-
- if (IS_ERR(filp))
- return PTR_ERR(filp);
-
- obj->filp = filp;
-
- return 0;
-}
-
-struct drm_i915_gem_object *
-i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size)
-{
- struct drm_i915_gem_object *obj;
- struct address_space *mapping;
- unsigned int cache_level;
- gfp_t mask;
- int ret;
-
- /* There is a prevalence of the assumption that we fit the object's
- * page count inside a 32bit _signed_ variable. Let's document this and
- * catch if we ever need to fix it. In the meantime, if you do spot
- * such a local variable, please consider fixing!
- */
- if (size >> PAGE_SHIFT > INT_MAX)
- return ERR_PTR(-E2BIG);
-
- if (overflows_type(size, obj->base.size))
- return ERR_PTR(-E2BIG);
-
- obj = i915_gem_object_alloc();
- if (obj == NULL)
- return ERR_PTR(-ENOMEM);
-
- ret = i915_gem_object_create_shmem(&dev_priv->drm, &obj->base, size);
- if (ret)
- goto fail;
-
- mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
- if (IS_I965GM(dev_priv) || IS_I965G(dev_priv)) {
- /* 965gm cannot relocate objects above 4GiB. */
- mask &= ~__GFP_HIGHMEM;
- mask |= __GFP_DMA32;
- }
-
- mapping = obj->base.filp->f_mapping;
- mapping_set_gfp_mask(mapping, mask);
- GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
-
- i915_gem_object_init(obj, &i915_gem_object_ops);
-
- obj->write_domain = I915_GEM_DOMAIN_CPU;
- obj->read_domains = I915_GEM_DOMAIN_CPU;
-
- if (HAS_LLC(dev_priv))
- /* On some devices, we can have the GPU use the LLC (the CPU
- * cache) for about a 10% performance improvement
- * compared to uncached. Graphics requests other than
- * display scanout are coherent with the CPU in
- * accessing this cache. This means in this mode we
- * don't need to clflush on the CPU side, and on the
- * GPU side we only need to flush internal caches to
- * get data visible to the CPU.
- *
- * However, we maintain the display planes as UC, and so
- * need to rebind when first used as such.
- */
- cache_level = I915_CACHE_LLC;
- else
- cache_level = I915_CACHE_NONE;
-
- i915_gem_object_set_cache_coherency(obj, cache_level);
-
- trace_i915_gem_object_create(obj);
-
- return obj;
-
-fail:
- i915_gem_object_free(obj);
- return ERR_PTR(ret);
-}
-
-static bool discard_backing_storage(struct drm_i915_gem_object *obj)
-{
- /* If we are the last user of the backing storage (be it shmemfs
- * pages or stolen etc), we know that the pages are going to be
- * immediately released. In this case, we can then skip copying
- * back the contents from the GPU.
- */
-
- if (obj->mm.madv != I915_MADV_WILLNEED)
- return false;
-
- if (obj->base.filp == NULL)
- return true;
-
- /* At first glance, this looks racy, but then again so would be
- * userspace racing mmap against close. However, the first external
- * reference to the filp can only be obtained through the
- * i915_gem_mmap_ioctl() which safeguards us against the user
- * acquiring such a reference whilst we are in the middle of
- * freeing the object.
- */
- return file_count(obj->base.filp) == 1;
-}
-
-static void __i915_gem_free_objects(struct drm_i915_private *i915,
- struct llist_node *freed)
-{
- struct drm_i915_gem_object *obj, *on;
- intel_wakeref_t wakeref;
-
- wakeref = intel_runtime_pm_get(i915);
- llist_for_each_entry_safe(obj, on, freed, freed) {
- struct i915_vma *vma, *vn;
-
- trace_i915_gem_object_destroy(obj);
-
- mutex_lock(&i915->drm.struct_mutex);
-
- GEM_BUG_ON(i915_gem_object_is_active(obj));
- list_for_each_entry_safe(vma, vn, &obj->vma.list, obj_link) {
- GEM_BUG_ON(i915_vma_is_active(vma));
- vma->flags &= ~I915_VMA_PIN_MASK;
- i915_vma_destroy(vma);
- }
- GEM_BUG_ON(!list_empty(&obj->vma.list));
- GEM_BUG_ON(!RB_EMPTY_ROOT(&obj->vma.tree));
-
- /* This serializes freeing with the shrinker. Since the free
- * is delayed, first by RCU then by the workqueue, we want the
- * shrinker to be able to free pages of unreferenced objects,
- * or else we may oom whilst there are plenty of deferred
- * freed objects.
- */
- if (i915_gem_object_has_pages(obj)) {
- spin_lock(&i915->mm.obj_lock);
- list_del_init(&obj->mm.link);
- spin_unlock(&i915->mm.obj_lock);
- }
-
- mutex_unlock(&i915->drm.struct_mutex);
-
- GEM_BUG_ON(obj->bind_count);
- GEM_BUG_ON(obj->userfault_count);
- GEM_BUG_ON(atomic_read(&obj->frontbuffer_bits));
- GEM_BUG_ON(!list_empty(&obj->lut_list));
-
- if (obj->ops->release)
- obj->ops->release(obj);
-
- if (WARN_ON(i915_gem_object_has_pinned_pages(obj)))
- atomic_set(&obj->mm.pages_pin_count, 0);
- __i915_gem_object_put_pages(obj, I915_MM_NORMAL);
- GEM_BUG_ON(i915_gem_object_has_pages(obj));
-
- if (obj->base.import_attach)
- drm_prime_gem_destroy(&obj->base, NULL);
-
- reservation_object_fini(&obj->__builtin_resv);
- drm_gem_object_release(&obj->base);
- i915_gem_info_remove_obj(i915, obj->base.size);
-
- bitmap_free(obj->bit_17);
- i915_gem_object_free(obj);
-
- GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
- atomic_dec(&i915->mm.free_count);
-
- if (on)
- cond_resched();
- }
- intel_runtime_pm_put(i915, wakeref);
-}
-
-static void i915_gem_flush_free_objects(struct drm_i915_private *i915)
-{
- struct llist_node *freed;
-
- /* Free the oldest, most stale object to keep the free_list short */
- freed = NULL;
- if (!llist_empty(&i915->mm.free_list)) { /* quick test for hotpath */
- /* Only one consumer of llist_del_first() allowed */
- spin_lock(&i915->mm.free_lock);
- freed = llist_del_first(&i915->mm.free_list);
- spin_unlock(&i915->mm.free_lock);
- }
- if (unlikely(freed)) {
- freed->next = NULL;
- __i915_gem_free_objects(i915, freed);
- }
-}
-
-static void __i915_gem_free_work(struct work_struct *work)
-{
- struct drm_i915_private *i915 =
- container_of(work, struct drm_i915_private, mm.free_work);
- struct llist_node *freed;
-
- /*
- * All file-owned VMA should have been released by this point through
- * i915_gem_close_object(), or earlier by i915_gem_context_close().
- * However, the object may also be bound into the global GTT (e.g.
- * older GPUs without per-process support, or for direct access through
- * the GTT either for the user or for scanout). Those VMA still need to
- * unbound now.
- */
-
- spin_lock(&i915->mm.free_lock);
- while ((freed = llist_del_all(&i915->mm.free_list))) {
- spin_unlock(&i915->mm.free_lock);
-
- __i915_gem_free_objects(i915, freed);
- if (need_resched())
- return;
-
- spin_lock(&i915->mm.free_lock);
- }
- spin_unlock(&i915->mm.free_lock);
-}
-
-static void __i915_gem_free_object_rcu(struct rcu_head *head)
-{
- struct drm_i915_gem_object *obj =
- container_of(head, typeof(*obj), rcu);
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
-
- /*
- * We reuse obj->rcu for the freed list, so we had better not treat
- * it like a rcu_head from this point forwards. And we expect all
- * objects to be freed via this path.
- */
- destroy_rcu_head(&obj->rcu);
-
- /*
- * Since we require blocking on struct_mutex to unbind the freed
- * object from the GPU before releasing resources back to the
- * system, we can not do that directly from the RCU callback (which may
- * be a softirq context), but must instead then defer that work onto a
- * kthread. We use the RCU callback rather than move the freed object
- * directly onto the work queue so that we can mix between using the
- * worker and performing frees directly from subsequent allocations for
- * crude but effective memory throttling.
- */
- if (llist_add(&obj->freed, &i915->mm.free_list))
- queue_work(i915->wq, &i915->mm.free_work);
-}
-
-void i915_gem_free_object(struct drm_gem_object *gem_obj)
-{
- struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
-
- if (obj->mm.quirked)
- __i915_gem_object_unpin_pages(obj);
-
- if (discard_backing_storage(obj))
- obj->mm.madv = I915_MADV_DONTNEED;
-
- /*
- * Before we free the object, make sure any pure RCU-only
- * read-side critical sections are complete, e.g.
- * i915_gem_busy_ioctl(). For the corresponding synchronized
- * lookup see i915_gem_object_lookup_rcu().
- */
- atomic_inc(&to_i915(obj->base.dev)->mm.free_count);
- call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
-}
-
-void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
-{
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
- if (!i915_gem_object_has_active_reference(obj) &&
- i915_gem_object_is_active(obj))
- i915_gem_object_set_active_reference(obj);
- else
- i915_gem_object_put(obj);
-}
-
void i915_gem_sanitize(struct drm_i915_private *i915)
{
intel_wakeref_t wakeref;
INIT_LIST_HEAD(&i915->mm.userfault_list);
intel_wakeref_auto_init(&i915->mm.userfault_wakeref, i915);
- INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
+ i915_gem_init__objects(i915);
}
int i915_gem_init_early(struct drm_i915_private *dev_priv)
}
}
-/* Allocate a new GEM object and fill it with the supplied data */
-struct drm_i915_gem_object *
-i915_gem_object_create_from_data(struct drm_i915_private *dev_priv,
- const void *data, size_t size)
-{
- struct drm_i915_gem_object *obj;
- struct file *file;
- size_t offset;
- int err;
-
- obj = i915_gem_object_create(dev_priv, round_up(size, PAGE_SIZE));
- if (IS_ERR(obj))
- return obj;
-
- GEM_BUG_ON(obj->write_domain != I915_GEM_DOMAIN_CPU);
-
- file = obj->base.filp;
- offset = 0;
- do {
- unsigned int len = min_t(typeof(size), size, PAGE_SIZE);
- struct page *page;
- void *pgdata, *vaddr;
-
- err = pagecache_write_begin(file, file->f_mapping,
- offset, len, 0,
- &page, &pgdata);
- if (err < 0)
- goto fail;
-
- vaddr = kmap(page);
- memcpy(vaddr, data, len);
- kunmap(page);
-
- err = pagecache_write_end(file, file->f_mapping,
- offset, len, len,
- page, pgdata);
- if (err < 0)
- goto fail;
-
- size -= len;
- data += len;
- offset += len;
- } while (size);
-
- return obj;
-
-fail:
- i915_gem_object_put(obj);
- return ERR_PTR(err);
-}
-
struct scatterlist *
i915_gem_object_get_sg(struct drm_i915_gem_object *obj,
unsigned int n,
if (obj->ops == &i915_gem_phys_ops)
return 0;
- if (obj->ops != &i915_gem_object_ops)
+ if (obj->ops != &i915_gem_shmem_ops)
return -EINVAL;
err = i915_gem_object_unbind(obj);
__i915_gem_object_pin_pages(obj);
if (!IS_ERR_OR_NULL(pages))
- i915_gem_object_ops.put_pages(obj, pages);
+ i915_gem_shmem_ops.put_pages(obj, pages);
mutex_unlock(&obj->mm.lock);
return 0;
err_xfer:
- obj->ops = &i915_gem_object_ops;
+ obj->ops = &i915_gem_shmem_ops;
if (!IS_ERR_OR_NULL(pages)) {
unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl);
BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE);
BUILD_BUG_ON(OA_BUFFER_SIZE < SZ_128K || OA_BUFFER_SIZE > SZ_16M);
- bo = i915_gem_object_create(dev_priv, OA_BUFFER_SIZE);
+ bo = i915_gem_object_create_shmem(dev_priv, OA_BUFFER_SIZE);
if (IS_ERR(bo)) {
DRM_ERROR("Failed to allocate OA buffer\n");
ret = PTR_ERR(bo);
if (size * 2 < dev_priv->stolen_usable_size)
obj = i915_gem_object_create_stolen(dev_priv, size);
if (obj == NULL)
- obj = i915_gem_object_create(dev_priv, size);
+ obj = i915_gem_object_create_shmem(dev_priv, size);
if (IS_ERR(obj)) {
DRM_ERROR("failed to allocate framebuffer\n");
ret = PTR_ERR(obj);
u64 flags;
int ret;
- obj = i915_gem_object_create(dev_priv, size);
+ obj = i915_gem_object_create_shmem(dev_priv, size);
if (IS_ERR(obj))
return ERR_CAST(obj);
goto fail;
}
- obj = i915_gem_object_create_from_data(dev_priv, fw->data, fw->size);
+ obj = i915_gem_object_create_shmem_from_data(dev_priv,
+ fw->data, fw->size);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
DRM_DEBUG_DRIVER("%s fw object_create err=%d\n",
for (i = 0; i < ARRAY_SIZE(sizes); ++i) {
unsigned int size = sizes[i];
- obj = i915_gem_object_create(i915, size);
+ obj = i915_gem_object_create_shmem(i915, size);
if (IS_ERR(obj))
return PTR_ERR(obj);
i915->mm.gemfs = NULL;
- obj = i915_gem_object_create(i915, PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
goto out_restore;
return 0;
}
- obj = i915_gem_object_create(i915, SZ_2M);
+ obj = i915_gem_object_create_shmem(i915, SZ_2M);
if (IS_ERR(obj))
return PTR_ERR(obj);
struct drm_i915_gem_object *obj;
struct dma_buf *dmabuf;
- obj = i915_gem_object_create(i915, PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
struct dma_buf *dmabuf;
int err;
- obj = i915_gem_object_create(i915, PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
void *ptr;
int err;
- obj = i915_gem_object_create(i915, PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
void *ptr;
int err;
- obj = i915_gem_object_create(i915, 2*PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, 2 * PAGE_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
/* Basic test to ensure we can create an object */
- obj = i915_gem_object_create(i915, PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
pr_err("i915_gem_object_create failed, err=%d\n", err);
* i.e. exercise the i915_gem_object_phys API.
*/
- obj = i915_gem_object_create(i915, PAGE_SIZE);
+ obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
pr_err("i915_gem_object_create failed, err=%d\n", err);
projects / kernel.git / commitdiff