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drm/i915/gem: Use a single chained reloc batches for a single execbuf 

As we can now keep chaining together a relocation batch to process any
number of relocations, we can keep building that relocation batch for
all of the target vma. This avoiding emitting a new request into the
ring for each target, consuming precious ring space and a potential
stall.

v2: Propagate the failure from submitting the relocation batch.

Testcase: igt/gem_exec_reloc/basic-wide-active
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200501192945.22215-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-05-01 20:29:44 +01:00
parent 964a9b0f61
commit 0e97fbb080
1 changed files with 24 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -268,6 +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;
@ -1051,14 +1052,14 @@ static unsigned int reloc_bb_flags(const struct reloc_cache *cache)
return cache->gen > 5 ? 0 : I915_DISPATCH_SECURE;
}
static void reloc_gpu_flush(struct reloc_cache *cache)
static int reloc_gpu_flush(struct reloc_cache *cache)
{
struct i915_request *rq;
int err;
rq = fetch_and_zero(&cache->rq);
if (!rq)
return;
return 0;
if (cache->rq_vma) {
struct drm_i915_gem_object *obj = cache->rq_vma->obj;
@ -1084,15 +1085,14 @@ static void reloc_gpu_flush(struct reloc_cache *cache)
intel_gt_chipset_flush(rq->engine->gt);
i915_request_add(rq);
return err;
}
static void reloc_cache_reset(struct reloc_cache *cache)
{
void *vaddr;
if (cache->rq)
reloc_gpu_flush(cache);
if (!cache->vaddr)
return;
@ -1285,7 +1285,6 @@ static int reloc_move_to_gpu(struct i915_request *rq, struct i915_vma *vma)
}
static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
struct i915_vma *vma,
unsigned int len)
{
struct reloc_cache *cache = &eb->reloc_cache;
@ -1308,7 +1307,7 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
goto out_pool;
}
batch = i915_vma_instance(pool->obj, vma->vm, NULL);
batch = i915_vma_instance(pool->obj, eb->context->vm, NULL);
if (IS_ERR(batch)) {
err = PTR_ERR(batch);
goto err_unmap;
@ -1328,10 +1327,6 @@ 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;
i915_vma_lock(batch);
err = i915_request_await_object(rq, batch->obj, false);
if (err == 0)
@ -1376,11 +1371,21 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb,
if (!intel_engine_can_store_dword(eb->engine))
return ERR_PTR(-ENODEV);
err = __reloc_gpu_alloc(eb, vma, len);
err = __reloc_gpu_alloc(eb, 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);
@ -1692,15 +1697,20 @@ 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)
return err;
break;
}
flush = reloc_gpu_flush(&eb->reloc_cache);
if (!err)
err = flush;
}
return 0;
return err;
}
static int eb_move_to_gpu(struct i915_execbuffer *eb)