Acquire all the objects and their backing storage, and page directories,
as used by execbuf under a single common ww_mutex. Albeit we have to
restart the critical section a few times in order to handle various
restrictions (such as avoiding copy_(from|to)_user and mmap_sem).
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 168 +++++++++---------
.../i915/gem/selftests/i915_gem_execbuffer.c | 8 +-
2 files changed, 87 insertions(+), 89 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index ebabc0746d50..db433f3f18ec 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -20,6 +20,7 @@
#include "gt/intel_gt_pm.h"
#include "gt/intel_gt_requests.h"
#include "gt/intel_ring.h"
+#include "mm/i915_acquire_ctx.h"
#include "i915_drv.h"
#include "i915_gem_clflush.h"
@@ -244,6 +245,8 @@ struct i915_execbuffer {
struct intel_context *context; /* logical state for the request */
struct i915_gem_context *gem_context; /** caller's context */
+ struct i915_acquire_ctx acquire; /** lock for _all_ DMA reservations */
+
struct i915_request *request; /** our request to build */
struct eb_vma *batch; /** identity of the batch obj/vma */
@@ -389,42 +392,6 @@ static void eb_vma_array_put(struct eb_vma_array *arr)
kref_put(&arr->kref, eb_vma_array_destroy);
}
-static int
-eb_lock_vma(struct i915_execbuffer *eb, struct ww_acquire_ctx *acquire)
-{
- struct eb_vma *ev;
- int err = 0;
-
- list_for_each_entry(ev, &eb->submit_list, submit_link) {
- struct i915_vma *vma = ev->vma;
-
- err = ww_mutex_lock_interruptible(&vma->resv->lock, acquire);
- if (err == -EDEADLK) {
- struct eb_vma *unlock = ev, *en;
-
- list_for_each_entry_safe_continue_reverse(unlock, en,
-
&eb->submit_list,
- submit_link) {
- ww_mutex_unlock(&unlock->vma->resv->lock);
- list_move_tail(&unlock->submit_link,
&eb->submit_list);
- }
-
- GEM_BUG_ON(!list_is_first(&ev->submit_link,
&eb->submit_list));
- err = ww_mutex_lock_slow_interruptible(&vma->resv->lock,
- acquire);
- }
- if (err) {
- list_for_each_entry_continue_reverse(ev,
- &eb->submit_list,
- submit_link)
- ww_mutex_unlock(&ev->vma->resv->lock);
- break;
- }
- }
-
- return err;
-}
-
static int eb_create(struct i915_execbuffer *eb)
{
/* Allocate an extra slot for use by the sentinel */
@@ -668,6 +635,25 @@ eb_add_vma(struct i915_execbuffer *eb,
}
}
+static int eb_lock_mm(struct i915_execbuffer *eb)
+{
+ struct eb_vma *ev;
+ int err;
+
+ list_for_each_entry(ev, &eb->bind_list, bind_link) {
+ err = i915_acquire_ctx_lock(&eb->acquire, ev->vma->obj);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int eb_acquire_mm(struct i915_execbuffer *eb)
+{
+ return i915_acquire_mm(&eb->acquire);
+}
+
struct eb_vm_work {
struct dma_fence_work base;
struct eb_vma_array *array;
@@ -1390,7 +1376,15 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
unsigned long count;
struct eb_vma *ev;
unsigned int pass;
- int err = 0;
+ int err;
+
+ err = eb_lock_mm(eb);
+ if (err)
+ return err;
+
+ err = eb_acquire_mm(eb);
+ if (err)
+ return err;
count = 0;
INIT_LIST_HEAD(&unbound);
@@ -1416,10 +1410,15 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
if (count == 0)
return 0;
+ /* We need to reserve page directories, release all, start over */
+ i915_acquire_ctx_fini(&eb->acquire);
+
pass = 0;
do {
struct eb_vm_work *work;
+ i915_acquire_ctx_init(&eb->acquire);
+
/*
* We need to hold one lock as we bind all the vma so that
* we have a consistent view of the entire vm and can plan
@@ -1436,6 +1435,11 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
* beneath it, so we have to stage and preallocate all the
* resources we may require before taking the mutex.
*/
+
+ err = eb_lock_mm(eb);
+ if (err)
+ return err;
+
work = eb_vm_work(eb, count);
if (!work)
return -ENOMEM;
@@ -1453,6 +1457,10 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
}
}
+ err = eb_acquire_mm(eb);
+ if (err)
+ return eb_vm_work_cancel(work, err);
+
err = i915_vm_pin_pt_stash(work->vm, &work->stash);
if (err)
return eb_vm_work_cancel(work, err);
@@ -1543,6 +1551,8 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
if (signal_pending(current))
return -EINTR;
+ i915_acquire_ctx_fini(&eb->acquire);
+
/* Now safe to wait with no reservations held */
if (err == -EAGAIN) {
@@ -1566,8 +1576,10 @@ static int eb_reserve_vm(struct i915_execbuffer *eb)
* total ownership of the vm.
*/
err = wait_for_unbinds(eb, &unbound, pass++);
- if (err)
+ if (err) {
+ i915_acquire_ctx_init(&eb->acquire);
return err;
+ }
} while (1);
}
@@ -1994,8 +2006,6 @@ static int reloc_move_to_gpu(struct i915_request *rq,
struct i915_vma *vma)
struct drm_i915_gem_object *obj = vma->obj;
int err;
- i915_vma_lock(vma);
-
if (obj->cache_dirty & ~obj->cache_coherent)
i915_gem_clflush_object(obj, 0);
obj->write_domain = 0;
@@ -2004,8 +2014,6 @@ static int reloc_move_to_gpu(struct i915_request *rq,
struct i915_vma *vma)
if (err == 0)
err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
- i915_vma_unlock(vma);
-
return err;
}
@@ -2334,11 +2342,9 @@ get_gpu_relocs(struct i915_execbuffer *eb,
int err;
GEM_BUG_ON(!vma);
- i915_vma_lock(vma);
err = i915_request_await_object(rq, vma->obj, false);
if (err == 0)
err = i915_vma_move_to_active(vma, rq, 0);
- i915_vma_unlock(vma);
if (err)
return ERR_PTR(err);
@@ -2470,6 +2476,7 @@ static int eb_relocate(struct i915_execbuffer *eb)
/* Drop everything before we copy_from_user */
list_for_each_entry(ev, &eb->bind_list, bind_link)
eb_unreserve_vma(ev);
+ i915_acquire_ctx_fini(&eb->acquire);
/* Pick a single buffer for all relocs, within reason */
c->bufsz *= sizeof(struct drm_i915_gem_relocation_entry);
@@ -2482,6 +2489,7 @@ static int eb_relocate(struct i915_execbuffer *eb)
/* Copy the user's relocations into plain system memory */
err = eb_relocs_copy_user(eb);
+ i915_acquire_ctx_init(&eb->acquire);
if (err)
return err;
@@ -2517,17 +2525,8 @@ static int eb_reserve(struct i915_execbuffer *eb)
static int eb_move_to_gpu(struct i915_execbuffer *eb)
{
- struct ww_acquire_ctx acquire;
struct eb_vma *ev;
- int err = 0;
-
- ww_acquire_init(&acquire, &reservation_ww_class);
-
- err = eb_lock_vma(eb, &acquire);
- if (err)
- goto err_fini;
-
- ww_acquire_done(&acquire);
+ int err;
list_for_each_entry(ev, &eb->submit_list, submit_link) {
struct i915_vma *vma = ev->vma;
@@ -2566,27 +2565,22 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
flags &= ~EXEC_OBJECT_ASYNC;
}
- if (err == 0 && !(flags & EXEC_OBJECT_ASYNC)) {
+ if (!(flags & EXEC_OBJECT_ASYNC)) {
err = i915_request_await_object
(eb->request, obj, flags & EXEC_OBJECT_WRITE);
+ if (unlikely(err))
+ goto err_skip;
}
- if (err == 0)
- err = i915_vma_move_to_active(vma, eb->request, flags);
-
- i915_vma_unlock(vma);
+ err = i915_vma_move_to_active(vma, eb->request, flags);
+ if (unlikely(err))
+ goto err_skip;
}
- ww_acquire_fini(&acquire);
-
- if (unlikely(err))
- goto err_skip;
/* Unconditionally flush any chipset caches (for streaming writes). */
intel_gt_chipset_flush(eb->engine->gt);
return 0;
-err_fini:
- ww_acquire_fini(&acquire);
err_skip:
i915_request_set_error_once(eb->request, err);
return err;
@@ -2749,39 +2743,27 @@ static int eb_parse_pipeline(struct i915_execbuffer *eb,
/* Mark active refs early for this worker, in case we get interrupted */
err = parser_mark_active(pw, eb->context->timeline);
if (err)
- goto err_commit;
-
- err = dma_resv_lock_interruptible(pw->batch->resv, NULL);
- if (err)
- goto err_commit;
+ goto out;
err = dma_resv_reserve_shared(pw->batch->resv, 1);
if (err)
- goto err_commit_unlock;
+ goto out;
/* Wait for all writes (and relocs) into the batch to complete */
err = i915_sw_fence_await_reservation(&pw->base.chain,
pw->batch->resv, NULL, false,
0, I915_FENCE_GFP);
if (err < 0)
- goto err_commit_unlock;
+ goto out;
/* Keep the batch alive and unwritten as we parse */
dma_resv_add_shared_fence(pw->batch->resv, &pw->base.dma);
- dma_resv_unlock(pw->batch->resv);
-
/* Force execution to wait for completion of the parser */
- dma_resv_lock(shadow->resv, NULL);
dma_resv_add_excl_fence(shadow->resv, &pw->base.dma);
- dma_resv_unlock(shadow->resv);
- dma_fence_work_commit_imm(&pw->base);
- return 0;
-
-err_commit_unlock:
- dma_resv_unlock(pw->batch->resv);
-err_commit:
+ err = 0;
+out:
i915_sw_fence_set_error_once(&pw->base.chain, err);
dma_fence_work_commit_imm(&pw->base);
return err;
@@ -2833,10 +2815,6 @@ static int eb_submit(struct i915_execbuffer *eb)
{
int err;
- err = eb_move_to_gpu(eb);
- if (err)
- return err;
-
if (eb->args->flags & I915_EXEC_GEN7_SOL_RESET) {
err = i915_reset_gen7_sol_offsets(eb->request);
if (err)
@@ -3420,6 +3398,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
goto err_engine;
lockdep_assert_held(&eb.context->timeline->mutex);
+ /* *** DMA-RESV LOCK *** */
+ i915_acquire_ctx_init(&eb.acquire);
+
err = eb_reserve(&eb);
if (err) {
/*
@@ -3433,6 +3414,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
goto err_vma;
}
+ /* *** DMA-RESV SEALED *** */
+
err = eb_parse(&eb);
if (err)
goto err_vma;
@@ -3483,9 +3466,20 @@ i915_gem_do_execbuffer(struct drm_device *dev,
intel_gt_buffer_pool_mark_active(eb.parser.shadow->vma->private,
eb.request);
+ err = eb_move_to_gpu(&eb);
+ if (err)
+ goto err_request;
+
+ /* *** DMA-RESV PUBLISHED *** */
+
trace_i915_request_queue(eb.request, eb.batch_flags);
err = eb_submit(&eb);
+
err_request:
+ i915_acquire_ctx_fini(&eb.acquire);
+ eb.acquire.locked = ERR_PTR(-1);
+ /* *** DMA-RESV UNLOCK *** */
+
i915_request_get(eb.request);
eb_request_add(&eb);
@@ -3496,6 +3490,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
i915_request_put(eb.request);
err_vma:
+ if (eb.acquire.locked != ERR_PTR(-1))
+ i915_acquire_ctx_fini(&eb.acquire);
eb_unlock_engine(&eb);
/* *** TIMELINE UNLOCK *** */
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 8776f2750fa7..57181718acb1 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c
@@ -101,11 +101,13 @@ static int __igt_gpu_reloc(struct i915_execbuffer *eb,
struct eb_vma *ev)
return err;
ev->exec->relocation_count = err;
+ i915_acquire_ctx_init(&eb->acquire);
+
err = eb_reserve_vm(eb);
- if (err)
- return err;
+ if (err == 0)
+ err = eb_relocs_gpu(eb);
- err = eb_relocs_gpu(eb);
+ i915_acquire_ctx_fini(&eb->acquire);
if (err)
return err;
--
2.20.1
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