diff options
author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-05-28 10:29:46 +0100 |
---|---|---|
committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-05-28 12:45:29 +0100 |
commit | f033428db28bdff19105e6050de77f857dabf5b8 (patch) | |
tree | 1bd130e779191c0c0fb6982dc3133fa38e313a2b /drivers/gpu | |
parent | 8475355f7a2645a022288301c03555c31fb4de17 (diff) | |
download | linux-f033428db28bdff19105e6050de77f857dabf5b8.tar.bz2 |
drm/i915: Move phys objects to its own file
Continuing the decluttering of i915_gem.c, this time the legacy physical
object.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-5-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/i915/Makefile | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_object.h | 11 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_object_types.h | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_pages.c | 521 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_phys.c | 211 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 61 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c | 80 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 712 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/i915_gem_shrinker.c | 59 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_gem_object.c | 54 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/selftests/i915_mock_selftests.h | 1 |
12 files changed, 895 insertions, 821 deletions
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index ccf0520e8ad4..a584fff53e63 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -88,6 +88,8 @@ i915-y += $(gt-y) obj-y += gem/ gem-y += \ gem/i915_gem_object.o \ + gem/i915_gem_pages.o \ + gem/i915_gem_phys.o \ gem/i915_gem_shmem.o i915-y += \ $(gem-y) \ diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h index 05ef6b0076ae..88495530ebd9 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h @@ -33,11 +33,17 @@ void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj, struct sg_table *pages, bool needs_clflush); +int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align); + 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); +struct sg_table * +__i915_gem_object_unset_pages(struct drm_i915_gem_object *obj); +void i915_gem_object_truncate(struct drm_i915_gem_object *obj); + /** * i915_gem_object_lookup_rcu - look up a temporary GEM object from its handle * @filp: DRM file private date @@ -236,6 +242,8 @@ i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj, struct sg_table *pages, unsigned int sg_page_sizes); + +int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj); int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj); static inline int __must_check @@ -291,7 +299,8 @@ enum i915_mm_subclass { /* lockdep subclass for obj->mm.lock/struct_mutex */ int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj, enum i915_mm_subclass subclass); -void __i915_gem_object_truncate(struct drm_i915_gem_object *obj); +void i915_gem_object_truncate(struct drm_i915_gem_object *obj); +void i915_gem_object_writeback(struct drm_i915_gem_object *obj); enum i915_map_type { I915_MAP_WB = 0, diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h index fe3b2a2775f7..df8e29ee3943 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h @@ -52,6 +52,8 @@ struct drm_i915_gem_object_ops { int (*get_pages)(struct drm_i915_gem_object *obj); void (*put_pages)(struct drm_i915_gem_object *obj, struct sg_table *pages); + void (*truncate)(struct drm_i915_gem_object *obj); + void (*writeback)(struct drm_i915_gem_object *obj); int (*pwrite)(struct drm_i915_gem_object *obj, const struct drm_i915_gem_pwrite *arg); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c new file mode 100644 index 000000000000..3879b3669dea --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c @@ -0,0 +1,521 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2014-2016 Intel Corporation + */ + +#include "i915_drv.h" +#include "i915_gem_object.h" + +void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj, + struct sg_table *pages, + unsigned int sg_page_sizes) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + unsigned long supported = INTEL_INFO(i915)->page_sizes; + int i; + + lockdep_assert_held(&obj->mm.lock); + + /* Make the pages coherent with the GPU (flushing any swapin). */ + if (obj->cache_dirty) { + obj->write_domain = 0; + if (i915_gem_object_has_struct_page(obj)) + drm_clflush_sg(pages); + obj->cache_dirty = false; + } + + obj->mm.get_page.sg_pos = pages->sgl; + obj->mm.get_page.sg_idx = 0; + + obj->mm.pages = pages; + + if (i915_gem_object_is_tiled(obj) && + i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) { + GEM_BUG_ON(obj->mm.quirked); + __i915_gem_object_pin_pages(obj); + obj->mm.quirked = true; + } + + GEM_BUG_ON(!sg_page_sizes); + obj->mm.page_sizes.phys = sg_page_sizes; + + /* + * Calculate the supported page-sizes which fit into the given + * sg_page_sizes. This will give us the page-sizes which we may be able + * to use opportunistically when later inserting into the GTT. For + * example if phys=2G, then in theory we should be able to use 1G, 2M, + * 64K or 4K pages, although in practice this will depend on a number of + * other factors. + */ + obj->mm.page_sizes.sg = 0; + for_each_set_bit(i, &supported, ilog2(I915_GTT_MAX_PAGE_SIZE) + 1) { + if (obj->mm.page_sizes.phys & ~0u << i) + obj->mm.page_sizes.sg |= BIT(i); + } + GEM_BUG_ON(!HAS_PAGE_SIZES(i915, obj->mm.page_sizes.sg)); + + spin_lock(&i915->mm.obj_lock); + list_add(&obj->mm.link, &i915->mm.unbound_list); + spin_unlock(&i915->mm.obj_lock); +} + +int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj) +{ + int err; + + if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) { + DRM_DEBUG("Attempting to obtain a purgeable object\n"); + return -EFAULT; + } + + err = obj->ops->get_pages(obj); + GEM_BUG_ON(!err && !i915_gem_object_has_pages(obj)); + + return err; +} + +/* Ensure that the associated pages are gathered from the backing storage + * and pinned into our object. i915_gem_object_pin_pages() may be called + * multiple times before they are released by a single call to + * i915_gem_object_unpin_pages() - once the pages are no longer referenced + * either as a result of memory pressure (reaping pages under the shrinker) + * or as the object is itself released. + */ +int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj) +{ + int err; + + err = mutex_lock_interruptible(&obj->mm.lock); + if (err) + return err; + + if (unlikely(!i915_gem_object_has_pages(obj))) { + GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj)); + + err = ____i915_gem_object_get_pages(obj); + if (err) + goto unlock; + + smp_mb__before_atomic(); + } + atomic_inc(&obj->mm.pages_pin_count); + +unlock: + mutex_unlock(&obj->mm.lock); + return err; +} + +/* Immediately discard the backing storage */ +void i915_gem_object_truncate(struct drm_i915_gem_object *obj) +{ + drm_gem_free_mmap_offset(&obj->base); + if (obj->ops->truncate) + obj->ops->truncate(obj); +} + +/* Try to discard unwanted pages */ +void i915_gem_object_writeback(struct drm_i915_gem_object *obj) +{ + lockdep_assert_held(&obj->mm.lock); + GEM_BUG_ON(i915_gem_object_has_pages(obj)); + + if (obj->ops->writeback) + obj->ops->writeback(obj); +} + +static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj) +{ + struct radix_tree_iter iter; + void __rcu **slot; + + rcu_read_lock(); + radix_tree_for_each_slot(slot, &obj->mm.get_page.radix, &iter, 0) + radix_tree_delete(&obj->mm.get_page.radix, iter.index); + rcu_read_unlock(); +} + +struct sg_table * +__i915_gem_object_unset_pages(struct drm_i915_gem_object *obj) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct sg_table *pages; + + pages = fetch_and_zero(&obj->mm.pages); + if (IS_ERR_OR_NULL(pages)) + return pages; + + spin_lock(&i915->mm.obj_lock); + list_del(&obj->mm.link); + spin_unlock(&i915->mm.obj_lock); + + if (obj->mm.mapping) { + void *ptr; + + ptr = page_mask_bits(obj->mm.mapping); + if (is_vmalloc_addr(ptr)) + vunmap(ptr); + else + kunmap(kmap_to_page(ptr)); + + obj->mm.mapping = NULL; + } + + __i915_gem_object_reset_page_iter(obj); + obj->mm.page_sizes.phys = obj->mm.page_sizes.sg = 0; + + return pages; +} + +int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj, + enum i915_mm_subclass subclass) +{ + struct sg_table *pages; + int err; + + if (i915_gem_object_has_pinned_pages(obj)) + return -EBUSY; + + GEM_BUG_ON(obj->bind_count); + + /* May be called by shrinker from within get_pages() (on another bo) */ + mutex_lock_nested(&obj->mm.lock, subclass); + if (unlikely(atomic_read(&obj->mm.pages_pin_count))) { + err = -EBUSY; + goto unlock; + } + + /* + * ->put_pages might need to allocate memory for the bit17 swizzle + * array, hence protect them from being reaped by removing them from gtt + * lists early. + */ + pages = __i915_gem_object_unset_pages(obj); + + /* + * XXX Temporary hijinx to avoid updating all backends to handle + * NULL pages. In the future, when we have more asynchronous + * get_pages backends we should be better able to handle the + * cancellation of the async task in a more uniform manner. + */ + if (!pages && !i915_gem_object_needs_async_cancel(obj)) + pages = ERR_PTR(-EINVAL); + + if (!IS_ERR(pages)) + obj->ops->put_pages(obj, pages); + + err = 0; +unlock: + mutex_unlock(&obj->mm.lock); + + return err; +} + +/* The 'mapping' part of i915_gem_object_pin_map() below */ +static void *i915_gem_object_map(const struct drm_i915_gem_object *obj, + enum i915_map_type type) +{ + unsigned long n_pages = obj->base.size >> PAGE_SHIFT; + struct sg_table *sgt = obj->mm.pages; + struct sgt_iter sgt_iter; + struct page *page; + struct page *stack_pages[32]; + struct page **pages = stack_pages; + unsigned long i = 0; + pgprot_t pgprot; + void *addr; + + /* A single page can always be kmapped */ + if (n_pages == 1 && type == I915_MAP_WB) + return kmap(sg_page(sgt->sgl)); + + if (n_pages > ARRAY_SIZE(stack_pages)) { + /* Too big for stack -- allocate temporary array instead */ + pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL); + if (!pages) + return NULL; + } + + for_each_sgt_page(page, sgt_iter, sgt) + pages[i++] = page; + + /* Check that we have the expected number of pages */ + GEM_BUG_ON(i != n_pages); + + switch (type) { + default: + MISSING_CASE(type); + /* fallthrough to use PAGE_KERNEL anyway */ + case I915_MAP_WB: + pgprot = PAGE_KERNEL; + break; + case I915_MAP_WC: + pgprot = pgprot_writecombine(PAGE_KERNEL_IO); + break; + } + addr = vmap(pages, n_pages, 0, pgprot); + + if (pages != stack_pages) + kvfree(pages); + + return addr; +} + +/* get, pin, and map the pages of the object into kernel space */ +void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, + enum i915_map_type type) +{ + enum i915_map_type has_type; + bool pinned; + void *ptr; + int err; + + if (unlikely(!i915_gem_object_has_struct_page(obj))) + return ERR_PTR(-ENXIO); + + err = mutex_lock_interruptible(&obj->mm.lock); + if (err) + return ERR_PTR(err); + + pinned = !(type & I915_MAP_OVERRIDE); + type &= ~I915_MAP_OVERRIDE; + + if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) { + if (unlikely(!i915_gem_object_has_pages(obj))) { + GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj)); + + err = ____i915_gem_object_get_pages(obj); + if (err) + goto err_unlock; + + smp_mb__before_atomic(); + } + atomic_inc(&obj->mm.pages_pin_count); + pinned = false; + } + GEM_BUG_ON(!i915_gem_object_has_pages(obj)); + + ptr = page_unpack_bits(obj->mm.mapping, &has_type); + if (ptr && has_type != type) { + if (pinned) { + err = -EBUSY; + goto err_unpin; + } + + if (is_vmalloc_addr(ptr)) + vunmap(ptr); + else + kunmap(kmap_to_page(ptr)); + + ptr = obj->mm.mapping = NULL; + } + + if (!ptr) { + ptr = i915_gem_object_map(obj, type); + if (!ptr) { + err = -ENOMEM; + goto err_unpin; + } + + obj->mm.mapping = page_pack_bits(ptr, type); + } + +out_unlock: + mutex_unlock(&obj->mm.lock); + return ptr; + +err_unpin: + atomic_dec(&obj->mm.pages_pin_count); +err_unlock: + ptr = ERR_PTR(err); + goto out_unlock; +} + +void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj, + unsigned long offset, + unsigned long size) +{ + enum i915_map_type has_type; + void *ptr; + + GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); + GEM_BUG_ON(range_overflows_t(typeof(obj->base.size), + offset, size, obj->base.size)); + + obj->mm.dirty = true; + + if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE) + return; + + ptr = page_unpack_bits(obj->mm.mapping, &has_type); + if (has_type == I915_MAP_WC) + return; + + drm_clflush_virt_range(ptr + offset, size); + if (size == obj->base.size) { + obj->write_domain &= ~I915_GEM_DOMAIN_CPU; + obj->cache_dirty = false; + } +} + +struct scatterlist * +i915_gem_object_get_sg(struct drm_i915_gem_object *obj, + unsigned int n, + unsigned int *offset) +{ + struct i915_gem_object_page_iter *iter = &obj->mm.get_page; + struct scatterlist *sg; + unsigned int idx, count; + + might_sleep(); + GEM_BUG_ON(n >= obj->base.size >> PAGE_SHIFT); + GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); + + /* As we iterate forward through the sg, we record each entry in a + * radixtree for quick repeated (backwards) lookups. If we have seen + * this index previously, we will have an entry for it. + * + * Initial lookup is O(N), but this is amortized to O(1) for + * sequential page access (where each new request is consecutive + * to the previous one). Repeated lookups are O(lg(obj->base.size)), + * i.e. O(1) with a large constant! + */ + if (n < READ_ONCE(iter->sg_idx)) + goto lookup; + + mutex_lock(&iter->lock); + + /* We prefer to reuse the last sg so that repeated lookup of this + * (or the subsequent) sg are fast - comparing against the last + * sg is faster than going through the radixtree. + */ + + sg = iter->sg_pos; + idx = iter->sg_idx; + count = __sg_page_count(sg); + + while (idx + count <= n) { + void *entry; + unsigned long i; + int ret; + + /* If we cannot allocate and insert this entry, or the + * individual pages from this range, cancel updating the + * sg_idx so that on this lookup we are forced to linearly + * scan onwards, but on future lookups we will try the + * insertion again (in which case we need to be careful of + * the error return reporting that we have already inserted + * this index). + */ + ret = radix_tree_insert(&iter->radix, idx, sg); + if (ret && ret != -EEXIST) + goto scan; + + entry = xa_mk_value(idx); + for (i = 1; i < count; i++) { + ret = radix_tree_insert(&iter->radix, idx + i, entry); + if (ret && ret != -EEXIST) + goto scan; + } + + idx += count; + sg = ____sg_next(sg); + count = __sg_page_count(sg); + } + +scan: + iter->sg_pos = sg; + iter->sg_idx = idx; + + mutex_unlock(&iter->lock); + + if (unlikely(n < idx)) /* insertion completed by another thread */ + goto lookup; + + /* In case we failed to insert the entry into the radixtree, we need + * to look beyond the current sg. + */ + while (idx + count <= n) { + idx += count; + sg = ____sg_next(sg); + count = __sg_page_count(sg); + } + + *offset = n - idx; + return sg; + +lookup: + rcu_read_lock(); + + sg = radix_tree_lookup(&iter->radix, n); + GEM_BUG_ON(!sg); + + /* If this index is in the middle of multi-page sg entry, + * the radix tree will contain a value entry that points + * to the start of that range. We will return the pointer to + * the base page and the offset of this page within the + * sg entry's range. + */ + *offset = 0; + if (unlikely(xa_is_value(sg))) { + unsigned long base = xa_to_value(sg); + + sg = radix_tree_lookup(&iter->radix, base); + GEM_BUG_ON(!sg); + + *offset = n - base; + } + + rcu_read_unlock(); + + return sg; +} + +struct page * +i915_gem_object_get_page(struct drm_i915_gem_object *obj, unsigned int n) +{ + struct scatterlist *sg; + unsigned int offset; + + GEM_BUG_ON(!i915_gem_object_has_struct_page(obj)); + + sg = i915_gem_object_get_sg(obj, n, &offset); + return nth_page(sg_page(sg), offset); +} + +/* Like i915_gem_object_get_page(), but mark the returned page dirty */ +struct page * +i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, + unsigned int n) +{ + struct page *page; + + page = i915_gem_object_get_page(obj, n); + if (!obj->mm.dirty) + set_page_dirty(page); + + return page; +} + +dma_addr_t +i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj, + unsigned long n, + unsigned int *len) +{ + struct scatterlist *sg; + unsigned int offset; + + sg = i915_gem_object_get_sg(obj, n, &offset); + + if (len) + *len = sg_dma_len(sg) - (offset << PAGE_SHIFT); + + return sg_dma_address(sg) + (offset << PAGE_SHIFT); +} + +dma_addr_t +i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, + unsigned long n) +{ + return i915_gem_object_get_dma_address_len(obj, n, NULL); +} diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c new file mode 100644 index 000000000000..1c0ce69f765b --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c @@ -0,0 +1,211 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2014-2016 Intel Corporation + */ + +#include <linux/highmem.h> +#include <linux/shmem_fs.h> +#include <linux/swap.h> + +#include <drm/drm.h> /* for drm_legacy.h! */ +#include <drm/drm_cache.h> +#include <drm/drm_legacy.h> /* for drm_pci.h! */ +#include <drm/drm_pci.h> + +#include "i915_drv.h" +#include "i915_gem_object.h" + +static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj) +{ + struct address_space *mapping = obj->base.filp->f_mapping; + struct drm_dma_handle *phys; + struct sg_table *st; + struct scatterlist *sg; + char *vaddr; + int i; + int err; + + if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj))) + return -EINVAL; + + /* Always aligning to the object size, allows a single allocation + * to handle all possible callers, and given typical object sizes, + * the alignment of the buddy allocation will naturally match. + */ + phys = drm_pci_alloc(obj->base.dev, + roundup_pow_of_two(obj->base.size), + roundup_pow_of_two(obj->base.size)); + if (!phys) + return -ENOMEM; + + vaddr = phys->vaddr; + for (i = 0; i < obj->base.size / PAGE_SIZE; i++) { + struct page *page; + char *src; + + page = shmem_read_mapping_page(mapping, i); + if (IS_ERR(page)) { + err = PTR_ERR(page); + goto err_phys; + } + + src = kmap_atomic(page); + memcpy(vaddr, src, PAGE_SIZE); + drm_clflush_virt_range(vaddr, PAGE_SIZE); + kunmap_atomic(src); + + put_page(page); + vaddr += PAGE_SIZE; + } + + i915_gem_chipset_flush(to_i915(obj->base.dev)); + + st = kmalloc(sizeof(*st), GFP_KERNEL); + if (!st) { + err = -ENOMEM; + goto err_phys; + } + + if (sg_alloc_table(st, 1, GFP_KERNEL)) { + kfree(st); + err = -ENOMEM; + goto err_phys; + } + + sg = st->sgl; + sg->offset = 0; + sg->length = obj->base.size; + + sg_dma_address(sg) = phys->busaddr; + sg_dma_len(sg) = obj->base.size; + + obj->phys_handle = phys; + + __i915_gem_object_set_pages(obj, st, sg->length); + + return 0; + +err_phys: + drm_pci_free(obj->base.dev, phys); + + return err; +} + +static void +i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj, + struct sg_table *pages) +{ + __i915_gem_object_release_shmem(obj, pages, false); + + if (obj->mm.dirty) { + struct address_space *mapping = obj->base.filp->f_mapping; + char *vaddr = obj->phys_handle->vaddr; + int i; + + for (i = 0; i < obj->base.size / PAGE_SIZE; i++) { + struct page *page; + char *dst; + + page = shmem_read_mapping_page(mapping, i); + if (IS_ERR(page)) + continue; + + dst = kmap_atomic(page); + drm_clflush_virt_range(vaddr, PAGE_SIZE); + memcpy(dst, vaddr, PAGE_SIZE); + kunmap_atomic(dst); + + set_page_dirty(page); + if (obj->mm.madv == I915_MADV_WILLNEED) + mark_page_accessed(page); + put_page(page); + vaddr += PAGE_SIZE; + } + obj->mm.dirty = false; + } + + sg_free_table(pages); + kfree(pages); + + drm_pci_free(obj->base.dev, obj->phys_handle); +} + +static void +i915_gem_object_release_phys(struct drm_i915_gem_object *obj) +{ + i915_gem_object_unpin_pages(obj); +} + +static const struct drm_i915_gem_object_ops i915_gem_phys_ops = { + .get_pages = i915_gem_object_get_pages_phys, + .put_pages = i915_gem_object_put_pages_phys, + .release = i915_gem_object_release_phys, +}; + +int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align) +{ + struct sg_table *pages; + int err; + + if (align > obj->base.size) + return -EINVAL; + + if (obj->ops == &i915_gem_phys_ops) + return 0; + + if (obj->ops != &i915_gem_shmem_ops) + return -EINVAL; + + err = i915_gem_object_unbind(obj); + if (err) + return err; + + mutex_lock(&obj->mm.lock); + + if (obj->mm.madv != I915_MADV_WILLNEED) { + err = -EFAULT; + goto err_unlock; + } + + if (obj->mm.quirked) { + err = -EFAULT; + goto err_unlock; + } + + if (obj->mm.mapping) { + err = -EBUSY; + goto err_unlock; + } + + pages = __i915_gem_object_unset_pages(obj); + + obj->ops = &i915_gem_phys_ops; + + err = ____i915_gem_object_get_pages(obj); + if (err) + goto err_xfer; + + /* Perma-pin (until release) the physical set of pages */ + __i915_gem_object_pin_pages(obj); + + if (!IS_ERR_OR_NULL(pages)) + i915_gem_shmem_ops.put_pages(obj, pages); + mutex_unlock(&obj->mm.lock); + return 0; + +err_xfer: + obj->ops = &i915_gem_shmem_ops; + if (!IS_ERR_OR_NULL(pages)) { + unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl); + + __i915_gem_object_set_pages(obj, pages, sg_page_sizes); + } +err_unlock: + mutex_unlock(&obj->mm.lock); + return err; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftests/i915_gem_phys.c" +#endif diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c index e2721bd9ab44..568164ca66fd 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c @@ -213,6 +213,65 @@ err_pages: return ret; } +static void +shmem_truncate(struct drm_i915_gem_object *obj) +{ + /* + * Our goal here is to return as much of the memory as + * is possible back to the system as we are called from OOM. + * To do this we must instruct the shmfs to drop all of its + * backing pages, *now*. + */ + shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1); + obj->mm.madv = __I915_MADV_PURGED; + obj->mm.pages = ERR_PTR(-EFAULT); +} + +static void +shmem_writeback(struct drm_i915_gem_object *obj) +{ + struct address_space *mapping; + struct writeback_control wbc = { + .sync_mode = WB_SYNC_NONE, + .nr_to_write = SWAP_CLUSTER_MAX, + .range_start = 0, + .range_end = LLONG_MAX, + .for_reclaim = 1, + }; + unsigned long i; + + /* + * Leave mmapings intact (GTT will have been revoked on unbinding, + * leaving only CPU mmapings around) and add those pages to the LRU + * instead of invoking writeback so they are aged and paged out + * as normal. + */ + mapping = obj->base.filp->f_mapping; + + /* Begin writeback on each dirty page */ + for (i = 0; i < obj->base.size >> PAGE_SHIFT; i++) { + struct page *page; + + page = find_lock_entry(mapping, i); + if (!page || xa_is_value(page)) + continue; + + if (!page_mapped(page) && clear_page_dirty_for_io(page)) { + int ret; + + SetPageReclaim(page); + ret = mapping->a_ops->writepage(page, &wbc); + if (!PageWriteback(page)) + ClearPageReclaim(page); + if (!ret) + goto put; + } + unlock_page(page); +put: + put_page(page); + } +} + void __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj, struct sg_table *pages, @@ -362,6 +421,8 @@ const struct drm_i915_gem_object_ops i915_gem_shmem_ops = { .get_pages = shmem_get_pages, .put_pages = shmem_put_pages, + .truncate = shmem_truncate, + .writeback = shmem_writeback, .pwrite = shmem_pwrite, }; diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c new file mode 100644 index 000000000000..ed64012e5d24 --- /dev/null +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_phys.c @@ -0,0 +1,80 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2016 Intel Corporation + */ + +#include "i915_selftest.h" + +#include "selftests/mock_gem_device.h" + +static int mock_phys_object(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct drm_i915_gem_object *obj; + int err; + + /* Create an object and bind it to a contiguous set of physical pages, + * i.e. exercise the i915_gem_object_phys API. + */ + + 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); + goto out; + } + + mutex_lock(&i915->drm.struct_mutex); + err = i915_gem_object_attach_phys(obj, PAGE_SIZE); + mutex_unlock(&i915->drm.struct_mutex); + if (err) { + pr_err("i915_gem_object_attach_phys failed, err=%d\n", err); + goto out_obj; + } + + if (obj->ops != &i915_gem_phys_ops) { + pr_err("i915_gem_object_attach_phys did not create a phys object\n"); + err = -EINVAL; + goto out_obj; + } + + if (!atomic_read(&obj->mm.pages_pin_count)) { + pr_err("i915_gem_object_attach_phys did not pin its phys pages\n"); + err = -EINVAL; + goto out_obj; + } + + /* Make the object dirty so that put_pages must do copy back the data */ + mutex_lock(&i915->drm.struct_mutex); + err = i915_gem_object_set_to_gtt_domain(obj, true); + mutex_unlock(&i915->drm.struct_mutex); + if (err) { + pr_err("i915_gem_object_set_to_gtt_domain failed with err=%d\n", + err); + goto out_obj; + } + +out_obj: + i915_gem_object_put(obj); +out: + return err; +} + +int i915_gem_phys_mock_selftests(void) +{ + static const struct i915_subtest tests[] = { + SUBTEST(mock_phys_object), + }; + struct drm_i915_private *i915; + int err; + + i915 = mock_gem_device(); + if (!i915) + return -ENOMEM; + + err = i915_subtests(tests, i915); + + drm_dev_put(&i915->drm); + return err; +} diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 507dba5dae9a..0f018fd58a60 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2903,8 +2903,6 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj, const struct i915_ggtt_view *view, unsigned int flags); void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma); -int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, - int align); int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file); void i915_gem_release(struct drm_device *dev, struct drm_file *file); diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 98ac2bbb6534..6f3e9394e806 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -26,7 +26,6 @@ */ #include <drm/drm_vma_manager.h> -#include <drm/drm_pci.h> #include <drm/i915_drm.h> #include <linux/dma-fence-array.h> #include <linux/kthread.h> @@ -99,133 +98,6 @@ i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data, return 0; } -static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj) -{ - struct address_space *mapping = obj->base.filp->f_mapping; - drm_dma_handle_t *phys; - struct sg_table *st; - struct scatterlist *sg; - char *vaddr; - int i; - int err; - - if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj))) - return -EINVAL; - - /* Always aligning to the object size, allows a single allocation - * to handle all possible callers, and given typical object sizes, - * the alignment of the buddy allocation will naturally match. - */ - phys = drm_pci_alloc(obj->base.dev, - roundup_pow_of_two(obj->base.size), - roundup_pow_of_two(obj->base.size)); - if (!phys) - return -ENOMEM; - - vaddr = phys->vaddr; - for (i = 0; i < obj->base.size / PAGE_SIZE; i++) { - struct page *page; - char *src; - - page = shmem_read_mapping_page(mapping, i); - if (IS_ERR(page)) { - err = PTR_ERR(page); - goto err_phys; - } - - src = kmap_atomic(page); - memcpy(vaddr, src, PAGE_SIZE); - drm_clflush_virt_range(vaddr, PAGE_SIZE); - kunmap_atomic(src); - - put_page(page); - vaddr += PAGE_SIZE; - } - - i915_gem_chipset_flush(to_i915(obj->base.dev)); - - st = kmalloc(sizeof(*st), GFP_KERNEL); - if (!st) { - err = -ENOMEM; - goto err_phys; - } - - if (sg_alloc_table(st, 1, GFP_KERNEL)) { - kfree(st); - err = -ENOMEM; - goto err_phys; - } - - sg = st->sgl; - sg->offset = 0; - sg->length = obj->base.size; - - sg_dma_address(sg) = phys->busaddr; - sg_dma_len(sg) = obj->base.size; - - obj->phys_handle = phys; - - __i915_gem_object_set_pages(obj, st, sg->length); - - return 0; - -err_phys: - drm_pci_free(obj->base.dev, phys); - - return err; -} - -static void -i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj, - struct sg_table *pages) -{ - __i915_gem_object_release_shmem(obj, pages, false); - - if (obj->mm.dirty) { - struct address_space *mapping = obj->base.filp->f_mapping; - char *vaddr = obj->phys_handle->vaddr; - int i; - - for (i = 0; i < obj->base.size / PAGE_SIZE; i++) { - struct page *page; - char *dst; - - page = shmem_read_mapping_page(mapping, i); - if (IS_ERR(page)) - continue; - - dst = kmap_atomic(page); - drm_clflush_virt_range(vaddr, PAGE_SIZE); - memcpy(dst, vaddr, PAGE_SIZE); - kunmap_atomic(dst); - - set_page_dirty(page); - if (obj->mm.madv == I915_MADV_WILLNEED) - mark_page_accessed(page); - put_page(page); - vaddr += PAGE_SIZE; - } - obj->mm.dirty = false; - } - - sg_free_table(pages); - kfree(pages); - - drm_pci_free(obj->base.dev, obj->phys_handle); -} - -static void -i915_gem_object_release_phys(struct drm_i915_gem_object *obj) -{ - i915_gem_object_unpin_pages(obj); -} - -static const struct drm_i915_gem_object_ops i915_gem_phys_ops = { - .get_pages = i915_gem_object_get_pages_phys, - .put_pages = i915_gem_object_put_pages_phys, - .release = i915_gem_object_release_phys, -}; - int i915_gem_object_unbind(struct drm_i915_gem_object *obj) { struct i915_vma *vma; @@ -1964,11 +1836,6 @@ static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj) return err; } -static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj) -{ - drm_gem_free_mmap_offset(&obj->base); -} - int i915_gem_mmap_gtt(struct drm_file *file, struct drm_device *dev, @@ -2014,111 +1881,6 @@ i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data, return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset); } -/* Immediately discard the backing storage */ -void __i915_gem_object_truncate(struct drm_i915_gem_object *obj) -{ - i915_gem_object_free_mmap_offset(obj); - - if (obj->base.filp == NULL) - return; - - /* Our goal here is to return as much of the memory as - * is possible back to the system as we are called from OOM. - * To do this we must instruct the shmfs to drop all of its - * backing pages, *now*. - */ - shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1); - obj->mm.madv = __I915_MADV_PURGED; - obj->mm.pages = ERR_PTR(-EFAULT); -} - -static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj) -{ - struct radix_tree_iter iter; - void __rcu **slot; - - rcu_read_lock(); - radix_tree_for_each_slot(slot, &obj->mm.get_page.radix, &iter, 0) - radix_tree_delete(&obj->mm.get_page.radix, iter.index); - rcu_read_unlock(); -} - -static struct sg_table * -__i915_gem_object_unset_pages(struct drm_i915_gem_object *obj) -{ - struct drm_i915_private *i915 = to_i915(obj->base.dev); - struct sg_table *pages; - - pages = fetch_and_zero(&obj->mm.pages); - if (IS_ERR_OR_NULL(pages)) - return pages; - - spin_lock(&i915->mm.obj_lock); - list_del(&obj->mm.link); - spin_unlock(&i915->mm.obj_lock); - - if (obj->mm.mapping) { - void *ptr; - - ptr = page_mask_bits(obj->mm.mapping); - if (is_vmalloc_addr(ptr)) - vunmap(ptr); - else - kunmap(kmap_to_page(ptr)); - - obj->mm.mapping = NULL; - } - - __i915_gem_object_reset_page_iter(obj); - obj->mm.page_sizes.phys = obj->mm.page_sizes.sg = 0; - - return pages; -} - -int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj, - enum i915_mm_subclass subclass) -{ - struct sg_table *pages; - int ret; - - if (i915_gem_object_has_pinned_pages(obj)) - return -EBUSY; - - GEM_BUG_ON(obj->bind_count); - - /* May be called by shrinker from within get_pages() (on another bo) */ - mutex_lock_nested(&obj->mm.lock, subclass); - if (unlikely(atomic_read(&obj->mm.pages_pin_count))) { - ret = -EBUSY; - goto unlock; - } - - /* - * ->put_pages might need to allocate memory for the bit17 swizzle - * array, hence protect them from being reaped by removing them from gtt - * lists early. - */ - pages = __i915_gem_object_unset_pages(obj); - - /* - * XXX Temporary hijinx to avoid updating all backends to handle - * NULL pages. In the future, when we have more asynchronous - * get_pages backends we should be better able to handle the - * cancellation of the async task in a more uniform manner. - */ - if (!pages && !i915_gem_object_needs_async_cancel(obj)) - pages = ERR_PTR(-EINVAL); - - if (!IS_ERR(pages)) - obj->ops->put_pages(obj, pages); - - ret = 0; -unlock: - mutex_unlock(&obj->mm.lock); - - return ret; -} - bool i915_sg_trim(struct sg_table *orig_st) { struct sg_table new_st; @@ -2147,252 +1909,6 @@ bool i915_sg_trim(struct sg_table *orig_st) return true; } -void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj, - struct sg_table *pages, - unsigned int sg_page_sizes) -{ - struct drm_i915_private *i915 = to_i915(obj->base.dev); - unsigned long supported = INTEL_INFO(i915)->page_sizes; - int i; - - lockdep_assert_held(&obj->mm.lock); - - /* Make the pages coherent with the GPU (flushing any swapin). */ - if (obj->cache_dirty) { - obj->write_domain = 0; - if (i915_gem_object_has_struct_page(obj)) - drm_clflush_sg(pages); - obj->cache_dirty = false; - } - - obj->mm.get_page.sg_pos = pages->sgl; - obj->mm.get_page.sg_idx = 0; - - obj->mm.pages = pages; - - if (i915_gem_object_is_tiled(obj) && - i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) { - GEM_BUG_ON(obj->mm.quirked); - __i915_gem_object_pin_pages(obj); - obj->mm.quirked = true; - } - - GEM_BUG_ON(!sg_page_sizes); - obj->mm.page_sizes.phys = sg_page_sizes; - - /* - * Calculate the supported page-sizes which fit into the given - * sg_page_sizes. This will give us the page-sizes which we may be able - * to use opportunistically when later inserting into the GTT. For - * example if phys=2G, then in theory we should be able to use 1G, 2M, - * 64K or 4K pages, although in practice this will depend on a number of - * other factors. - */ - obj->mm.page_sizes.sg = 0; - for_each_set_bit(i, &supported, ilog2(I915_GTT_MAX_PAGE_SIZE) + 1) { - if (obj->mm.page_sizes.phys & ~0u << i) - obj->mm.page_sizes.sg |= BIT(i); - } - GEM_BUG_ON(!HAS_PAGE_SIZES(i915, obj->mm.page_sizes.sg)); - - spin_lock(&i915->mm.obj_lock); - list_add(&obj->mm.link, &i915->mm.unbound_list); - spin_unlock(&i915->mm.obj_lock); -} - -static int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj) -{ - int err; - - if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) { - DRM_DEBUG("Attempting to obtain a purgeable object\n"); - return -EFAULT; - } - - err = obj->ops->get_pages(obj); - GEM_BUG_ON(!err && !i915_gem_object_has_pages(obj)); - - return err; -} - -/* Ensure that the associated pages are gathered from the backing storage - * and pinned into our object. i915_gem_object_pin_pages() may be called - * multiple times before they are released by a single call to - * i915_gem_object_unpin_pages() - once the pages are no longer referenced - * either as a result of memory pressure (reaping pages under the shrinker) - * or as the object is itself released. - */ -int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj) -{ - int err; - - err = mutex_lock_interruptible(&obj->mm.lock); - if (err) - return err; - - if (unlikely(!i915_gem_object_has_pages(obj))) { - GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj)); - - err = ____i915_gem_object_get_pages(obj); - if (err) - goto unlock; - - smp_mb__before_atomic(); - } - atomic_inc(&obj->mm.pages_pin_count); - -unlock: - mutex_unlock(&obj->mm.lock); - return err; -} - -/* The 'mapping' part of i915_gem_object_pin_map() below */ -static void *i915_gem_object_map(const struct drm_i915_gem_object *obj, - enum i915_map_type type) -{ - unsigned long n_pages = obj->base.size >> PAGE_SHIFT; - struct sg_table *sgt = obj->mm.pages; - struct sgt_iter sgt_iter; - struct page *page; - struct page *stack_pages[32]; - struct page **pages = stack_pages; - unsigned long i = 0; - pgprot_t pgprot; - void *addr; - - /* A single page can always be kmapped */ - if (n_pages == 1 && type == I915_MAP_WB) - return kmap(sg_page(sgt->sgl)); - - if (n_pages > ARRAY_SIZE(stack_pages)) { - /* Too big for stack -- allocate temporary array instead */ - pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL); - if (!pages) - return NULL; - } - - for_each_sgt_page(page, sgt_iter, sgt) - pages[i++] = page; - - /* Check that we have the expected number of pages */ - GEM_BUG_ON(i != n_pages); - - switch (type) { - default: - MISSING_CASE(type); - /* fallthrough to use PAGE_KERNEL anyway */ - case I915_MAP_WB: - pgprot = PAGE_KERNEL; - break; - case I915_MAP_WC: - pgprot = pgprot_writecombine(PAGE_KERNEL_IO); - break; - } - addr = vmap(pages, n_pages, 0, pgprot); - - if (pages != stack_pages) - kvfree(pages); - - return addr; -} - -/* get, pin, and map the pages of the object into kernel space */ -void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, - enum i915_map_type type) -{ - enum i915_map_type has_type; - bool pinned; - void *ptr; - int ret; - - if (unlikely(!i915_gem_object_has_struct_page(obj))) - return ERR_PTR(-ENXIO); - - ret = mutex_lock_interruptible(&obj->mm.lock); - if (ret) - return ERR_PTR(ret); - - pinned = !(type & I915_MAP_OVERRIDE); - type &= ~I915_MAP_OVERRIDE; - - if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) { - if (unlikely(!i915_gem_object_has_pages(obj))) { - GEM_BUG_ON(i915_gem_object_has_pinned_pages(obj)); - - ret = ____i915_gem_object_get_pages(obj); - if (ret) - goto err_unlock; - - smp_mb__before_atomic(); - } - atomic_inc(&obj->mm.pages_pin_count); - pinned = false; - } - GEM_BUG_ON(!i915_gem_object_has_pages(obj)); - - ptr = page_unpack_bits(obj->mm.mapping, &has_type); - if (ptr && has_type != type) { - if (pinned) { - ret = -EBUSY; - goto err_unpin; - } - - if (is_vmalloc_addr(ptr)) - vunmap(ptr); - else - kunmap(kmap_to_page(ptr)); - - ptr = obj->mm.mapping = NULL; - } - - if (!ptr) { - ptr = i915_gem_object_map(obj, type); - if (!ptr) { - ret = -ENOMEM; - goto err_unpin; - } - - obj->mm.mapping = page_pack_bits(ptr, type); - } - -out_unlock: - mutex_unlock(&obj->mm.lock); - return ptr; - -err_unpin: - atomic_dec(&obj->mm.pages_pin_count); -err_unlock: - ptr = ERR_PTR(ret); - goto out_unlock; -} - -void __i915_gem_object_flush_map(struct drm_i915_gem_object *obj, - unsigned long offset, - unsigned long size) -{ - enum i915_map_type has_type; - void *ptr; - - GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); - GEM_BUG_ON(range_overflows_t(typeof(obj->base.size), - offset, size, obj->base.size)); - - obj->mm.dirty = true; - - if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE) - return; - - ptr = page_unpack_bits(obj->mm.mapping, &has_type); - if (has_type == I915_MAP_WC) - return; - - drm_clflush_virt_range(ptr + offset, size); - if (size == obj->base.size) { - obj->write_domain &= ~I915_GEM_DOMAIN_CPU; - obj->cache_dirty = false; - } -} - static unsigned long to_wait_timeout(s64 timeout_ns) { if (timeout_ns < 0) @@ -3381,7 +2897,7 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data, /* if the object is no longer attached, discard its backing storage */ if (obj->mm.madv == I915_MADV_DONTNEED && !i915_gem_object_has_pages(obj)) - __i915_gem_object_truncate(obj); + i915_gem_object_truncate(obj); args->retained = obj->mm.madv != __I915_MADV_PURGED; mutex_unlock(&obj->mm.lock); @@ -4157,232 +3673,6 @@ void i915_gem_track_fb(struct drm_i915_gem_object *old, } } -struct scatterlist * -i915_gem_object_get_sg(struct drm_i915_gem_object *obj, - unsigned int n, - unsigned int *offset) -{ - struct i915_gem_object_page_iter *iter = &obj->mm.get_page; - struct scatterlist *sg; - unsigned int idx, count; - - might_sleep(); - GEM_BUG_ON(n >= obj->base.size >> PAGE_SHIFT); - GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); - - /* As we iterate forward through the sg, we record each entry in a - * radixtree for quick repeated (backwards) lookups. If we have seen - * this index previously, we will have an entry for it. - * - * Initial lookup is O(N), but this is amortized to O(1) for - * sequential page access (where each new request is consecutive - * to the previous one). Repeated lookups are O(lg(obj->base.size)), - * i.e. O(1) with a large constant! - */ - if (n < READ_ONCE(iter->sg_idx)) - goto lookup; - - mutex_lock(&iter->lock); - - /* We prefer to reuse the last sg so that repeated lookup of this - * (or the subsequent) sg are fast - comparing against the last - * sg is faster than going through the radixtree. - */ - - sg = iter->sg_pos; - idx = iter->sg_idx; - count = __sg_page_count(sg); - - while (idx + count <= n) { - void *entry; - unsigned long i; - int ret; - - /* If we cannot allocate and insert this entry, or the - * individual pages from this range, cancel updating the - * sg_idx so that on this lookup we are forced to linearly - * scan onwards, but on future lookups we will try the - * insertion again (in which case we need to be careful of - * the error return reporting that we have already inserted - * this index). - */ - ret = radix_tree_insert(&iter->radix, idx, sg); - if (ret && ret != -EEXIST) - goto scan; - - entry = xa_mk_value(idx); - for (i = 1; i < count; i++) { - ret = radix_tree_insert(&iter->radix, idx + i, entry); - if (ret && ret != -EEXIST) - goto scan; - } - - idx += count; - sg = ____sg_next(sg); - count = __sg_page_count(sg); - } - -scan: - iter->sg_pos = sg; - iter->sg_idx = idx; - - mutex_unlock(&iter->lock); - - if (unlikely(n < idx)) /* insertion completed by another thread */ - goto lookup; - - /* In case we failed to insert the entry into the radixtree, we need - * to look beyond the current sg. - */ - while (idx + count <= n) { - idx += count; - sg = ____sg_next(sg); - count = __sg_page_count(sg); - } - - *offset = n - idx; - return sg; - -lookup: - rcu_read_lock(); - - sg = radix_tree_lookup(&iter->radix, n); - GEM_BUG_ON(!sg); - - /* If this index is in the middle of multi-page sg entry, - * the radix tree will contain a value entry that points - * to the start of that range. We will return the pointer to - * the base page and the offset of this page within the - * sg entry's range. - */ - *offset = 0; - if (unlikely(xa_is_value(sg))) { - unsigned long base = xa_to_value(sg); - - sg = radix_tree_lookup(&iter->radix, base); - GEM_BUG_ON(!sg); - - *offset = n - base; - } - - rcu_read_unlock(); - - return sg; -} - -struct page * -i915_gem_object_get_page(struct drm_i915_gem_object *obj, unsigned int n) -{ - struct scatterlist *sg; - unsigned int offset; - - GEM_BUG_ON(!i915_gem_object_has_struct_page(obj)); - - sg = i915_gem_object_get_sg(obj, n, &offset); - return nth_page(sg_page(sg), offset); -} - -/* Like i915_gem_object_get_page(), but mark the returned page dirty */ -struct page * -i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj, - unsigned int n) -{ - struct page *page; - - page = i915_gem_object_get_page(obj, n); - if (!obj->mm.dirty) - set_page_dirty(page); - - return page; -} - -dma_addr_t -i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj, - unsigned long n, - unsigned int *len) -{ - struct scatterlist *sg; - unsigned int offset; - - sg = i915_gem_object_get_sg(obj, n, &offset); - - if (len) - *len = sg_dma_len(sg) - (offset << PAGE_SHIFT); - - return sg_dma_address(sg) + (offset << PAGE_SHIFT); -} - -dma_addr_t -i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj, - unsigned long n) -{ - return i915_gem_object_get_dma_address_len(obj, n, NULL); -} - - -int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align) -{ - struct sg_table *pages; - int err; - - if (align > obj->base.size) - return -EINVAL; - - if (obj->ops == &i915_gem_phys_ops) - return 0; - - if (obj->ops != &i915_gem_shmem_ops) - return -EINVAL; - - err = i915_gem_object_unbind(obj); - if (err) - return err; - - mutex_lock(&obj->mm.lock); - - if (obj->mm.madv != I915_MADV_WILLNEED) { - err = -EFAULT; - goto err_unlock; - } - - if (obj->mm.quirked) { - err = -EFAULT; - goto err_unlock; - } - - if (obj->mm.mapping) { - err = -EBUSY; - goto err_unlock; - } - - pages = __i915_gem_object_unset_pages(obj); - - obj->ops = &i915_gem_phys_ops; - - err = ____i915_gem_object_get_pages(obj); - if (err) - goto err_xfer; - - /* Perma-pin (until release) the physical set of pages */ - __i915_gem_object_pin_pages(obj); - - if (!IS_ERR_OR_NULL(pages)) - i915_gem_shmem_ops.put_pages(obj, pages); - mutex_unlock(&obj->mm.lock); - return 0; - -err_xfer: - obj->ops = &i915_gem_shmem_ops; - if (!IS_ERR_OR_NULL(pages)) { - unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl); - - __i915_gem_object_set_pages(obj, pages, sg_page_sizes); - } -err_unlock: - mutex_unlock(&obj->mm.lock); - return err; -} - #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) #include "selftests/scatterlist.c" #include "selftests/mock_gem_device.c" diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c index 588e3898b120..2c7aefb3e101 100644 --- a/drivers/gpu/drm/i915/i915_gem_shrinker.c +++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c @@ -114,65 +114,18 @@ static bool unsafe_drop_pages(struct drm_i915_gem_object *obj) return !i915_gem_object_has_pages(obj); } -static void __start_writeback(struct drm_i915_gem_object *obj, - unsigned int flags) +static void try_to_writeback(struct drm_i915_gem_object *obj, + unsigned int flags) { - struct address_space *mapping; - struct writeback_control wbc = { - .sync_mode = WB_SYNC_NONE, - .nr_to_write = SWAP_CLUSTER_MAX, - .range_start = 0, - .range_end = LLONG_MAX, - .for_reclaim = 1, - }; - unsigned long i; - - lockdep_assert_held(&obj->mm.lock); - GEM_BUG_ON(i915_gem_object_has_pages(obj)); - switch (obj->mm.madv) { case I915_MADV_DONTNEED: - __i915_gem_object_truncate(obj); + i915_gem_object_truncate(obj); case __I915_MADV_PURGED: return; } - if (!obj->base.filp) - return; - - if (!(flags & I915_SHRINK_WRITEBACK)) - return; - - /* - * Leave mmapings intact (GTT will have been revoked on unbinding, - * leaving only CPU mmapings around) and add those pages to the LRU - * instead of invoking writeback so they are aged and paged out - * as normal. - */ - mapping = obj->base.filp->f_mapping; - - /* Begin writeback on each dirty page */ - for (i = 0; i < obj->base.size >> PAGE_SHIFT; i++) { - struct page *page; - - page = find_lock_entry(mapping, i); - if (!page || xa_is_value(page)) - continue; - - if (!page_mapped(page) && clear_page_dirty_for_io(page)) { - int ret; - - SetPageReclaim(page); - ret = mapping->a_ops->writepage(page, &wbc); - if (!PageWriteback(page)) - ClearPageReclaim(page); - if (!ret) - goto put; - } - unlock_page(page); -put: - put_page(page); - } + if (flags & I915_SHRINK_WRITEBACK) + i915_gem_object_writeback(obj); } /** @@ -315,7 +268,7 @@ i915_gem_shrink(struct drm_i915_private *i915, mutex_lock_nested(&obj->mm.lock, I915_MM_SHRINKER); if (!i915_gem_object_has_pages(obj)) { - __start_writeback(obj, flags); + try_to_writeback(obj, flags); count += obj->base.size >> PAGE_SHIFT; } mutex_unlock(&obj->mm.lock); diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_object.c b/drivers/gpu/drm/i915/selftests/i915_gem_object.c index a0f59fb0d701..b98a286a8be5 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_object.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_object.c @@ -49,59 +49,6 @@ out: return err; } -static int igt_phys_object(void *arg) -{ - struct drm_i915_private *i915 = arg; - struct drm_i915_gem_object *obj; - int err; - - /* Create an object and bind it to a contiguous set of physical pages, - * i.e. exercise the i915_gem_object_phys API. - */ - - 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); - goto out; - } - - mutex_lock(&i915->drm.struct_mutex); - err = i915_gem_object_attach_phys(obj, PAGE_SIZE); - mutex_unlock(&i915->drm.struct_mutex); - if (err) { - pr_err("i915_gem_object_attach_phys failed, err=%d\n", err); - goto out_obj; - } - - if (obj->ops != &i915_gem_phys_ops) { - pr_err("i915_gem_object_attach_phys did not create a phys object\n"); - err = -EINVAL; - goto out_obj; - } - - if (!atomic_read(&obj->mm.pages_pin_count)) { - pr_err("i915_gem_object_attach_phys did not pin its phys pages\n"); - err = -EINVAL; - goto out_obj; - } - - /* Make the object dirty so that put_pages must do copy back the data */ - mutex_lock(&i915->drm.struct_mutex); - err = i915_gem_object_set_to_gtt_domain(obj, true); - mutex_unlock(&i915->drm.struct_mutex); - if (err) { - pr_err("i915_gem_object_set_to_gtt_domain failed with err=%d\n", - err); - goto out_obj; - } - -out_obj: - i915_gem_object_put(obj); -out: - return err; -} - static int igt_gem_huge(void *arg) { const unsigned int nreal = 509; /* just to be awkward */ @@ -631,7 +578,6 @@ int i915_gem_object_mock_selftests(void) { static const struct i915_subtest tests[] = { SUBTEST(igt_gem_object), - SUBTEST(igt_phys_object), }; struct drm_i915_private *i915; int err; diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h index 88e5ab586337..510eb176bb2c 100644 --- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h +++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h @@ -18,6 +18,7 @@ selftest(engine, intel_engine_cs_mock_selftests) selftest(timelines, i915_timeline_mock_selftests) selftest(requests, i915_request_mock_selftests) selftest(objects, i915_gem_object_mock_selftests) +selftest(phys, i915_gem_phys_mock_selftests) selftest(dmabuf, i915_gem_dmabuf_mock_selftests) selftest(vma, i915_vma_mock_selftests) selftest(evict, i915_gem_evict_mock_selftests) |