This reverts commit 964a9b0f611ee ("drm/i915/gem: Use chained reloc batches")
and commit 0e97fbb080553 ("drm/i915/gem: Use a single chained reloc batches
for a single execbuf").
This breaks ww mutex -EDEADLK handling, and we can deal with relocations
fine without it. The ww mutexes protect concurrent access to the BO's.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 171 ++++--------------
.../i915/gem/selftests/i915_gem_execbuffer.c | 8 +-
2 files changed, 35 insertions(+), 144 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 446e76e95c38..8e2ae8317c5c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -268,9 +268,7 @@ struct i915_execbuffer {
bool has_fence : 1;
bool needs_unfenced : 1;
- struct i915_vma *target;
struct i915_request *rq;
- struct i915_vma *rq_vma;
u32 *rq_cmd;
unsigned int rq_size;
} reloc_cache;
@@ -962,7 +960,7 @@ static void reloc_cache_init(struct reloc_cache *cache,
cache->needs_unfenced = INTEL_INFO(i915)->unfenced_needs_alignment;
cache->node.flags = 0;
cache->rq = NULL;
- cache->target = NULL;
+ cache->rq_size = 0;
}
static inline void *unmask_page(unsigned long p)
@@ -984,122 +982,29 @@ static inline struct i915_ggtt *cache_to_ggtt(struct reloc_cache *cache)
return &i915->ggtt;
}
-#define RELOC_TAIL 4
-
-static int reloc_gpu_chain(struct reloc_cache *cache)
+static void reloc_gpu_flush(struct reloc_cache *cache)
{
- struct intel_gt_buffer_pool_node *pool;
- struct i915_request *rq = cache->rq;
- struct i915_vma *batch;
- u32 *cmd;
- int err;
-
- pool = intel_gt_get_buffer_pool(rq->engine->gt, PAGE_SIZE);
- if (IS_ERR(pool))
- return PTR_ERR(pool);
-
- batch = i915_vma_instance(pool->obj, rq->context->vm, NULL);
- if (IS_ERR(batch)) {
- err = PTR_ERR(batch);
- goto out_pool;
- }
-
- err = i915_vma_pin(batch, 0, 0, PIN_USER | PIN_NONBLOCK);
- if (err)
- goto out_pool;
-
- GEM_BUG_ON(cache->rq_size + RELOC_TAIL > PAGE_SIZE / sizeof(u32));
- cmd = cache->rq_cmd + cache->rq_size;
- *cmd++ = MI_ARB_CHECK;
- if (cache->gen >= 8)
- *cmd++ = MI_BATCH_BUFFER_START_GEN8;
- else if (cache->gen >= 6)
- *cmd++ = MI_BATCH_BUFFER_START;
- else
- *cmd++ = MI_BATCH_BUFFER_START | MI_BATCH_GTT;
- *cmd++ = lower_32_bits(batch->node.start);
- *cmd++ = upper_32_bits(batch->node.start); /* Always 0 for gen<8 */
- i915_gem_object_flush_map(cache->rq_vma->obj);
- i915_gem_object_unpin_map(cache->rq_vma->obj);
- cache->rq_vma = NULL;
-
- err = intel_gt_buffer_pool_mark_active(pool, rq);
- if (err == 0) {
- i915_vma_lock(batch);
- err = i915_request_await_object(rq, batch->obj, false);
- if (err == 0)
- err = i915_vma_move_to_active(batch, rq, 0);
- i915_vma_unlock(batch);
- }
- i915_vma_unpin(batch);
- if (err)
- goto out_pool;
+ struct drm_i915_gem_object *obj = cache->rq->batch->obj;
- cmd = i915_gem_object_pin_map(batch->obj,
- cache->has_llc ?
- I915_MAP_FORCE_WB :
- I915_MAP_FORCE_WC);
- if (IS_ERR(cmd)) {
- err = PTR_ERR(cmd);
- goto out_pool;
- }
+ GEM_BUG_ON(cache->rq_size >= obj->base.size / sizeof(u32));
+ cache->rq_cmd[cache->rq_size] = MI_BATCH_BUFFER_END;
- /* Return with batch mapping (cmd) still pinned */
- cache->rq_cmd = cmd;
- cache->rq_size = 0;
- cache->rq_vma = batch;
+ __i915_gem_object_flush_map(obj, 0, sizeof(u32) * (cache->rq_size + 1));
+ i915_gem_object_unpin_map(obj);
-out_pool:
- intel_gt_buffer_pool_put(pool);
- return err;
-}
+ intel_gt_chipset_flush(cache->rq->engine->gt);
-static unsigned int reloc_bb_flags(const struct reloc_cache *cache)
-{
- return cache->gen > 5 ? 0 : I915_DISPATCH_SECURE;
-}
-
-static int reloc_gpu_flush(struct reloc_cache *cache)
-{
- struct i915_request *rq;
- int err;
-
- rq = fetch_and_zero(&cache->rq);
- if (!rq)
- return 0;
-
- if (cache->rq_vma) {
- struct drm_i915_gem_object *obj = cache->rq_vma->obj;
-
- GEM_BUG_ON(cache->rq_size >= obj->base.size / sizeof(u32));
- cache->rq_cmd[cache->rq_size++] = MI_BATCH_BUFFER_END;
-
- __i915_gem_object_flush_map(obj,
- 0, sizeof(u32) * cache->rq_size);
- i915_gem_object_unpin_map(obj);
- }
-
- err = 0;
- if (rq->engine->emit_init_breadcrumb)
- err = rq->engine->emit_init_breadcrumb(rq);
- if (!err)
- err = rq->engine->emit_bb_start(rq,
- rq->batch->node.start,
- PAGE_SIZE,
- reloc_bb_flags(cache));
- if (err)
- i915_request_set_error_once(rq, err);
-
- intel_gt_chipset_flush(rq->engine->gt);
- i915_request_add(rq);
-
- return err;
+ i915_request_add(cache->rq);
+ cache->rq = NULL;
}
static void reloc_cache_reset(struct reloc_cache *cache)
{
void *vaddr;
+ if (cache->rq)
+ reloc_gpu_flush(cache);
+
if (!cache->vaddr)
return;
@@ -1293,6 +1198,7 @@ static int reloc_move_to_gpu(struct i915_request *rq, struct i915_vma *vma)
static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
struct intel_engine_cs *engine,
+ struct i915_vma *vma,
unsigned int len)
{
struct reloc_cache *cache = &eb->reloc_cache;
@@ -1315,7 +1221,7 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
goto out_pool;
}
- batch = i915_vma_instance(pool->obj, eb->context->vm, NULL);
+ batch = i915_vma_instance(pool->obj, vma->vm, NULL);
if (IS_ERR(batch)) {
err = PTR_ERR(batch);
goto err_unmap;
@@ -1351,6 +1257,16 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
if (err)
goto err_request;
+ err = reloc_move_to_gpu(rq, vma);
+ if (err)
+ goto err_request;
+
+ err = eb->engine->emit_bb_start(rq,
+ batch->node.start, PAGE_SIZE,
+ cache->gen > 5 ? 0 : I915_DISPATCH_SECURE);
+ if (err)
+ goto skip_request;
+
i915_vma_lock(batch);
err = i915_request_await_object(rq, batch->obj, false);
if (err == 0)
@@ -1365,7 +1281,6 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
cache->rq = rq;
cache->rq_cmd = cmd;
cache->rq_size = 0;
- cache->rq_vma = batch;
/* Return with batch mapping (cmd) still pinned */
goto out_pool;
@@ -1394,9 +1309,12 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb,
{
struct reloc_cache *cache = &eb->reloc_cache;
u32 *cmd;
- int err;
+
+ if (cache->rq_size > PAGE_SIZE/sizeof(u32) - (len + 1))
+ reloc_gpu_flush(cache);
if (unlikely(!cache->rq)) {
+ int err;
struct intel_engine_cs *engine = eb->engine;
if (!reloc_can_use_engine(engine)) {
@@ -1405,31 +1323,11 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb,
return ERR_PTR(-ENODEV);
}
- err = __reloc_gpu_alloc(eb, engine, len);
+ err = __reloc_gpu_alloc(eb, engine, vma, len);
if (unlikely(err))
return ERR_PTR(err);
}
- if (vma != cache->target) {
- err = reloc_move_to_gpu(cache->rq, vma);
- if (unlikely(err)) {
- i915_request_set_error_once(cache->rq, err);
- return ERR_PTR(err);
- }
-
- cache->target = vma;
- }
-
- if (unlikely(cache->rq_size + len >
- PAGE_SIZE / sizeof(u32) - RELOC_TAIL)) {
- err = reloc_gpu_chain(cache);
- if (unlikely(err)) {
- i915_request_set_error_once(cache->rq, err);
- return ERR_PTR(err);
- }
- }
-
- GEM_BUG_ON(cache->rq_size + len >= PAGE_SIZE / sizeof(u32));
cmd = cache->rq_cmd + cache->rq_size;
cache->rq_size += len;
@@ -1777,20 +1675,15 @@ static int eb_relocate(struct i915_execbuffer *eb)
/* The objects are in their final locations, apply the relocations. */
if (eb->args->flags & __EXEC_HAS_RELOC) {
struct eb_vma *ev;
- int flush;
list_for_each_entry(ev, &eb->relocs, reloc_link) {
err = eb_relocate_vma(eb, ev);
if (err)
- break;
+ return err;
}
-
- flush = reloc_gpu_flush(&eb->reloc_cache);
- if (!err)
- err = flush;
}
- return err;
+ return 0;
}
static int eb_move_to_gpu(struct i915_execbuffer *eb)
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..580884cffec3 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
@@ -53,13 +53,13 @@ static int __igt_gpu_reloc(struct i915_execbuffer *eb,
}
/* Skip to the end of the cmd page */
- i = PAGE_SIZE / sizeof(u32) - RELOC_TAIL - 1;
+ i = PAGE_SIZE / sizeof(u32) - 1;
i -= eb->reloc_cache.rq_size;
memset32(eb->reloc_cache.rq_cmd + eb->reloc_cache.rq_size,
MI_NOOP, i);
eb->reloc_cache.rq_size += i;
- /* Force batch chaining */
+ /* Force next batch */
if (!__reloc_entry_gpu(eb, vma,
offsets[2] * sizeof(u32),
2)) {
@@ -69,9 +69,7 @@ static int __igt_gpu_reloc(struct i915_execbuffer *eb,
GEM_BUG_ON(!eb->reloc_cache.rq);
rq = i915_request_get(eb->reloc_cache.rq);
- err = reloc_gpu_flush(&eb->reloc_cache);
- if (err)
- goto put_rq;
+ reloc_gpu_flush(&eb->reloc_cache);
GEM_BUG_ON(eb->reloc_cache.rq);
err = i915_gem_object_wait(obj, I915_WAIT_INTERRUPTIBLE, HZ / 2);
--
2.27.0
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