[PATCH 13/15] drm/i915/gem: Async GPU relocations only
Chris Wilson
chris at chris-wilson.co.uk
Sun May 24 18:30:13 UTC 2020
Reduce the 3 relocation patches down to the single path that accommodates
all. The primary motivation for this is to guard the relocations with a
natural fence (derived from the i915_request used to write the
relocation from the GPU).
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 295 ++----------------
.../i915/gem/selftests/i915_gem_execbuffer.c | 21 +-
2 files changed, 27 insertions(+), 289 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 219a36995b96..e840b2a85284 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -45,13 +45,6 @@ struct eb_vma_array {
struct eb_vma vma[];
};
-enum {
- FORCE_CPU_RELOC = 1,
- FORCE_GTT_RELOC,
- FORCE_GPU_RELOC,
-#define DBG_FORCE_RELOC 0 /* choose one of the above! */
-};
-
#define __EXEC_OBJECT_HAS_PIN BIT(31)
#define __EXEC_OBJECT_HAS_FENCE BIT(30)
#define __EXEC_OBJECT_NEEDS_MAP BIT(29)
@@ -260,8 +253,6 @@ struct i915_execbuffer {
*/
struct reloc_cache {
struct drm_mm_node node; /** temporary GTT binding */
- unsigned long vaddr; /** Current kmap address */
- unsigned long page; /** Currently mapped page index */
unsigned int gen; /** Cached value of INTEL_GEN */
bool use_64bit_reloc : 1;
bool has_llc : 1;
@@ -605,23 +596,6 @@ eb_add_vma(struct i915_execbuffer *eb,
}
}
-static inline int use_cpu_reloc(const struct reloc_cache *cache,
- const struct drm_i915_gem_object *obj)
-{
- if (!i915_gem_object_has_struct_page(obj))
- return false;
-
- if (DBG_FORCE_RELOC == FORCE_CPU_RELOC)
- return true;
-
- if (DBG_FORCE_RELOC == FORCE_GTT_RELOC)
- return false;
-
- return (cache->has_llc ||
- obj->cache_dirty ||
- obj->cache_level != I915_CACHE_NONE);
-}
-
static int eb_reserve_vma(const struct i915_execbuffer *eb,
struct eb_vma *ev,
u64 pin_flags)
@@ -945,8 +919,6 @@ relocation_target(const struct drm_i915_gem_relocation_entry *reloc,
static void reloc_cache_init(struct reloc_cache *cache,
struct drm_i915_private *i915)
{
- cache->page = -1;
- cache->vaddr = 0;
/* Must be a variable in the struct to allow GCC to unroll. */
cache->gen = INTEL_GEN(i915);
cache->has_llc = HAS_LLC(i915);
@@ -1089,181 +1061,6 @@ static int reloc_gpu_flush(struct reloc_cache *cache)
return err;
}
-static void reloc_cache_reset(struct reloc_cache *cache)
-{
- void *vaddr;
-
- if (!cache->vaddr)
- return;
-
- vaddr = unmask_page(cache->vaddr);
- if (cache->vaddr & KMAP) {
- if (cache->vaddr & CLFLUSH_AFTER)
- mb();
-
- kunmap_atomic(vaddr);
- i915_gem_object_finish_access((struct drm_i915_gem_object *)cache->node.mm);
- } else {
- struct i915_ggtt *ggtt = cache_to_ggtt(cache);
-
- intel_gt_flush_ggtt_writes(ggtt->vm.gt);
- io_mapping_unmap_atomic((void __iomem *)vaddr);
-
- if (drm_mm_node_allocated(&cache->node)) {
- ggtt->vm.clear_range(&ggtt->vm,
- cache->node.start,
- cache->node.size);
- mutex_lock(&ggtt->vm.mutex);
- drm_mm_remove_node(&cache->node);
- mutex_unlock(&ggtt->vm.mutex);
- } else {
- i915_vma_unpin((struct i915_vma *)cache->node.mm);
- }
- }
-
- cache->vaddr = 0;
- cache->page = -1;
-}
-
-static void *reloc_kmap(struct drm_i915_gem_object *obj,
- struct reloc_cache *cache,
- unsigned long page)
-{
- void *vaddr;
-
- if (cache->vaddr) {
- kunmap_atomic(unmask_page(cache->vaddr));
- } else {
- unsigned int flushes;
- int err;
-
- err = i915_gem_object_prepare_write(obj, &flushes);
- if (err)
- return ERR_PTR(err);
-
- BUILD_BUG_ON(KMAP & CLFLUSH_FLAGS);
- BUILD_BUG_ON((KMAP | CLFLUSH_FLAGS) & PAGE_MASK);
-
- cache->vaddr = flushes | KMAP;
- cache->node.mm = (void *)obj;
- if (flushes)
- mb();
- }
-
- vaddr = kmap_atomic(i915_gem_object_get_dirty_page(obj, page));
- cache->vaddr = unmask_flags(cache->vaddr) | (unsigned long)vaddr;
- cache->page = page;
-
- return vaddr;
-}
-
-static void *reloc_iomap(struct drm_i915_gem_object *obj,
- struct reloc_cache *cache,
- unsigned long page)
-{
- struct i915_ggtt *ggtt = cache_to_ggtt(cache);
- unsigned long offset;
- void *vaddr;
-
- if (cache->vaddr) {
- intel_gt_flush_ggtt_writes(ggtt->vm.gt);
- io_mapping_unmap_atomic((void __force __iomem *) unmask_page(cache->vaddr));
- } else {
- struct i915_vma *vma;
- int err;
-
- if (i915_gem_object_is_tiled(obj))
- return ERR_PTR(-EINVAL);
-
- if (use_cpu_reloc(cache, obj))
- return NULL;
-
- i915_gem_object_lock(obj);
- err = i915_gem_object_set_to_gtt_domain(obj, true);
- i915_gem_object_unlock(obj);
- if (err)
- return ERR_PTR(err);
-
- vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
- PIN_MAPPABLE |
- PIN_NONBLOCK /* NOWARN */ |
- PIN_NOEVICT);
- if (IS_ERR(vma)) {
- memset(&cache->node, 0, sizeof(cache->node));
- mutex_lock(&ggtt->vm.mutex);
- err = drm_mm_insert_node_in_range
- (&ggtt->vm.mm, &cache->node,
- PAGE_SIZE, 0, I915_COLOR_UNEVICTABLE,
- 0, ggtt->mappable_end,
- DRM_MM_INSERT_LOW);
- mutex_unlock(&ggtt->vm.mutex);
- if (err) /* no inactive aperture space, use cpu reloc */
- return NULL;
- } else {
- cache->node.start = vma->node.start;
- cache->node.mm = (void *)vma;
- }
- }
-
- offset = cache->node.start;
- if (drm_mm_node_allocated(&cache->node)) {
- ggtt->vm.insert_page(&ggtt->vm,
- i915_gem_object_get_dma_address(obj, page),
- offset, I915_CACHE_NONE, 0);
- } else {
- offset += page << PAGE_SHIFT;
- }
-
- vaddr = (void __force *)io_mapping_map_atomic_wc(&ggtt->iomap,
- offset);
- cache->page = page;
- cache->vaddr = (unsigned long)vaddr;
-
- return vaddr;
-}
-
-static void *reloc_vaddr(struct drm_i915_gem_object *obj,
- struct reloc_cache *cache,
- unsigned long page)
-{
- void *vaddr;
-
- if (cache->page == page) {
- vaddr = unmask_page(cache->vaddr);
- } else {
- vaddr = NULL;
- if ((cache->vaddr & KMAP) == 0)
- vaddr = reloc_iomap(obj, cache, page);
- if (!vaddr)
- vaddr = reloc_kmap(obj, cache, page);
- }
-
- return vaddr;
-}
-
-static void clflush_write32(u32 *addr, u32 value, unsigned int flushes)
-{
- if (unlikely(flushes & (CLFLUSH_BEFORE | CLFLUSH_AFTER))) {
- if (flushes & CLFLUSH_BEFORE) {
- clflushopt(addr);
- mb();
- }
-
- *addr = value;
-
- /*
- * Writes to the same cacheline are serialised by the CPU
- * (including clflush). On the write path, we only require
- * that it hits memory in an orderly fashion and place
- * mb barriers at the start and end of the relocation phase
- * to ensure ordering of clflush wrt to the system.
- */
- if (flushes & CLFLUSH_AFTER)
- clflushopt(addr);
- } else
- *addr = value;
-}
-
static int reloc_move_to_gpu(struct i915_request *rq, struct i915_vma *vma)
{
struct drm_i915_gem_object *obj = vma->obj;
@@ -1429,17 +1226,6 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb,
return cmd;
}
-static inline bool use_reloc_gpu(struct i915_vma *vma)
-{
- if (DBG_FORCE_RELOC == FORCE_GPU_RELOC)
- return true;
-
- if (DBG_FORCE_RELOC)
- return false;
-
- return !dma_resv_test_signaled_rcu(vma->resv, true);
-}
-
static unsigned long vma_phys_addr(struct i915_vma *vma, u32 offset)
{
struct page *page;
@@ -1454,10 +1240,10 @@ static unsigned long vma_phys_addr(struct i915_vma *vma, u32 offset)
return addr + offset_in_page(offset);
}
-static bool __reloc_entry_gpu(struct i915_execbuffer *eb,
- struct i915_vma *vma,
- u64 offset,
- u64 target_addr)
+static int __reloc_entry_gpu(struct i915_execbuffer *eb,
+ struct i915_vma *vma,
+ u64 offset,
+ u64 target_addr)
{
const unsigned int gen = eb->reloc_cache.gen;
unsigned int len;
@@ -1473,7 +1259,7 @@ static bool __reloc_entry_gpu(struct i915_execbuffer *eb,
batch = reloc_gpu(eb, vma, len);
if (IS_ERR(batch))
- return false;
+ return PTR_ERR(batch);
addr = gen8_canonical_addr(vma->node.start + offset);
if (gen >= 8) {
@@ -1522,55 +1308,21 @@ static bool __reloc_entry_gpu(struct i915_execbuffer *eb,
*batch++ = target_addr;
}
- return true;
-}
-
-static bool reloc_entry_gpu(struct i915_execbuffer *eb,
- struct i915_vma *vma,
- u64 offset,
- u64 target_addr)
-{
- if (eb->reloc_cache.vaddr)
- return false;
-
- if (!use_reloc_gpu(vma))
- return false;
-
- return __reloc_entry_gpu(eb, vma, offset, target_addr);
+ return 0;
}
static u64
-relocate_entry(struct i915_vma *vma,
+relocate_entry(struct i915_execbuffer *eb,
+ struct i915_vma *vma,
const struct drm_i915_gem_relocation_entry *reloc,
- struct i915_execbuffer *eb,
const struct i915_vma *target)
{
u64 target_addr = relocation_target(reloc, target);
- u64 offset = reloc->offset;
-
- if (!reloc_entry_gpu(eb, vma, offset, target_addr)) {
- bool wide = eb->reloc_cache.use_64bit_reloc;
- void *vaddr;
-
-repeat:
- vaddr = reloc_vaddr(vma->obj,
- &eb->reloc_cache,
- offset >> PAGE_SHIFT);
- if (IS_ERR(vaddr))
- return PTR_ERR(vaddr);
-
- GEM_BUG_ON(!IS_ALIGNED(offset, sizeof(u32)));
- clflush_write32(vaddr + offset_in_page(offset),
- lower_32_bits(target_addr),
- eb->reloc_cache.vaddr);
-
- if (wide) {
- offset += sizeof(u32);
- target_addr >>= 32;
- wide = false;
- goto repeat;
- }
- }
+ int err;
+
+ err = __reloc_entry_gpu(eb, vma, reloc->offset, target_addr);
+ if (err)
+ return err;
return target->node.start | UPDATE;
}
@@ -1635,8 +1387,7 @@ eb_relocate_entry(struct i915_execbuffer *eb,
* If the relocation already has the right value in it, no
* more work needs to be done.
*/
- if (!DBG_FORCE_RELOC &&
- gen8_canonical_addr(target->vma->node.start) == reloc->presumed_offset)
+ if (gen8_canonical_addr(target->vma->node.start) == reloc->presumed_offset)
return 0;
/* Check that the relocation address is valid... */
@@ -1668,7 +1419,7 @@ eb_relocate_entry(struct i915_execbuffer *eb,
ev->flags &= ~EXEC_OBJECT_ASYNC;
/* and update the user's relocation entry */
- return relocate_entry(ev->vma, reloc, eb, target->vma);
+ return relocate_entry(eb, ev->vma, reloc, target->vma);
}
static int eb_relocate_vma(struct i915_execbuffer *eb, struct eb_vma *ev)
@@ -1706,10 +1457,8 @@ static int eb_relocate_vma(struct i915_execbuffer *eb, struct eb_vma *ev)
* this is bad and so lockdep complains vehemently.
*/
copied = __copy_from_user(r, urelocs, count * sizeof(r[0]));
- if (unlikely(copied)) {
- remain = -EFAULT;
- goto out;
- }
+ if (unlikely(copied))
+ return -EFAULT;
remain -= count;
do {
@@ -1717,8 +1466,7 @@ static int eb_relocate_vma(struct i915_execbuffer *eb, struct eb_vma *ev)
if (likely(offset == 0)) {
} else if ((s64)offset < 0) {
- remain = (int)offset;
- goto out;
+ return (int)offset;
} else {
/*
* Note that reporting an error now
@@ -1748,9 +1496,8 @@ static int eb_relocate_vma(struct i915_execbuffer *eb, struct eb_vma *ev)
} while (r++, --count);
urelocs += ARRAY_SIZE(stack);
} while (remain);
-out:
- reloc_cache_reset(&eb->reloc_cache);
- return remain;
+
+ return 0;
}
static int eb_relocate(struct i915_execbuffer *eb)
@@ -2618,7 +2365,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
eb.i915 = i915;
eb.file = file;
eb.args = args;
- if (DBG_FORCE_RELOC || !(args->flags & I915_EXEC_NO_RELOC))
+ if (!(args->flags & I915_EXEC_NO_RELOC))
args->flags |= __EXEC_HAS_RELOC;
eb.exec = exec;
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
index a49016f8ee0d..57c14d3340cd 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
@@ -37,20 +37,14 @@ static int __igt_gpu_reloc(struct i915_execbuffer *eb,
return err;
/* 8-Byte aligned */
- if (!__reloc_entry_gpu(eb, vma,
- offsets[0] * sizeof(u32),
- 0)) {
- err = -EIO;
+ err = __reloc_entry_gpu(eb, vma, offsets[0] * sizeof(u32), 0);
+ if (err)
goto unpin_vma;
- }
/* !8-Byte aligned */
- if (!__reloc_entry_gpu(eb, vma,
- offsets[1] * sizeof(u32),
- 1)) {
- err = -EIO;
+ err = __reloc_entry_gpu(eb, vma, offsets[1] * sizeof(u32), 1);
+ if (err)
goto unpin_vma;
- }
/* Skip to the end of the cmd page */
i = PAGE_SIZE / sizeof(u32) - RELOC_TAIL - 1;
@@ -60,12 +54,9 @@ static int __igt_gpu_reloc(struct i915_execbuffer *eb,
eb->reloc_cache.rq_size += i;
/* Force batch chaining */
- if (!__reloc_entry_gpu(eb, vma,
- offsets[2] * sizeof(u32),
- 2)) {
- err = -EIO;
+ err = __reloc_entry_gpu(eb, vma, offsets[2] * sizeof(u32), 2);
+ if (err)
goto unpin_vma;
- }
GEM_BUG_ON(!eb->reloc_cache.rq);
rq = i915_request_get(eb->reloc_cache.rq);
--
2.20.1
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