[Intel-gfx] [PATCH 22/26] drm/i915: Move i915_vma_lock in the selftests to avoid lock inversion, v2.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Tue Jun 23 14:28:39 UTC 2020
Make sure vma_lock is not used as inner lock when kernel context is used,
and add ww handling where appropriate.
Ensure that execbuf selftests keep passing by using ww handling.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
.../i915/gem/selftests/i915_gem_coherency.c | 26 ++++++------
.../drm/i915/gem/selftests/i915_gem_mman.c | 41 ++++++++++++++-----
drivers/gpu/drm/i915/gt/selftest_rps.c | 30 ++++++++------
drivers/gpu/drm/i915/selftests/i915_request.c | 18 +++++---
4 files changed, 75 insertions(+), 40 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
index dcdfc396f2f8..7049a6bbc03d 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
@@ -201,25 +201,25 @@ static int gpu_set(struct context *ctx, unsigned long offset, u32 v)
i915_gem_object_lock(ctx->obj, NULL);
err = i915_gem_object_set_to_gtt_domain(ctx->obj, true);
- i915_gem_object_unlock(ctx->obj);
if (err)
- return err;
+ goto out_unlock;
vma = i915_gem_object_ggtt_pin(ctx->obj, NULL, 0, 0, 0);
- if (IS_ERR(vma))
- return PTR_ERR(vma);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_unlock;
+ }
rq = intel_engine_create_kernel_request(ctx->engine);
if (IS_ERR(rq)) {
- i915_vma_unpin(vma);
- return PTR_ERR(rq);
+ err = PTR_ERR(rq);
+ goto out_unpin;
}
cs = intel_ring_begin(rq, 4);
if (IS_ERR(cs)) {
- i915_request_add(rq);
- i915_vma_unpin(vma);
- return PTR_ERR(cs);
+ err = PTR_ERR(cs);
+ goto out_rq;
}
if (INTEL_GEN(ctx->engine->i915) >= 8) {
@@ -240,14 +240,16 @@ static int gpu_set(struct context *ctx, unsigned long offset, u32 v)
}
intel_ring_advance(rq, cs);
- i915_vma_lock(vma);
err = i915_request_await_object(rq, vma->obj, true);
if (err == 0)
err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
- i915_vma_unlock(vma);
- i915_vma_unpin(vma);
+out_rq:
i915_request_add(rq);
+out_unpin:
+ i915_vma_unpin(vma);
+out_unlock:
+ i915_gem_object_unlock(ctx->obj);
return err;
}
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
index 9fb95a45bcad..d27d87a678c8 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -528,31 +528,42 @@ static int make_obj_busy(struct drm_i915_gem_object *obj)
for_each_uabi_engine(engine, i915) {
struct i915_request *rq;
struct i915_vma *vma;
+ struct i915_gem_ww_ctx ww;
int err;
vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
if (IS_ERR(vma))
return PTR_ERR(vma);
- err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ i915_gem_ww_ctx_init(&ww, false);
+retry:
+ err = i915_gem_object_lock(obj, &ww);
+ if (!err)
+ err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_USER);
if (err)
- return err;
+ goto err;
rq = intel_engine_create_kernel_request(engine);
if (IS_ERR(rq)) {
- i915_vma_unpin(vma);
- return PTR_ERR(rq);
+ err = PTR_ERR(rq);
+ goto err_unpin;
}
- i915_vma_lock(vma);
err = i915_request_await_object(rq, vma->obj, true);
if (err == 0)
err = i915_vma_move_to_active(vma, rq,
EXEC_OBJECT_WRITE);
- i915_vma_unlock(vma);
i915_request_add(rq);
+err_unpin:
i915_vma_unpin(vma);
+err:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&ww);
if (err)
return err;
}
@@ -1123,6 +1134,7 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915,
for_each_uabi_engine(engine, i915) {
struct i915_request *rq;
struct i915_vma *vma;
+ struct i915_gem_ww_ctx ww;
vma = i915_vma_instance(obj, engine->kernel_context->vm, NULL);
if (IS_ERR(vma)) {
@@ -1130,9 +1142,13 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915,
goto out_unmap;
}
- err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ i915_gem_ww_ctx_init(&ww, false);
+retry:
+ err = i915_gem_object_lock(obj, &ww);
+ if (!err)
+ err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_USER);
if (err)
- goto out_unmap;
+ goto out_ww;
rq = i915_request_create(engine->kernel_context);
if (IS_ERR(rq)) {
@@ -1140,11 +1156,9 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915,
goto out_unpin;
}
- 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);
err = engine->emit_bb_start(rq, vma->node.start, 0, 0);
i915_request_get(rq);
@@ -1166,6 +1180,13 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915,
out_unpin:
i915_vma_unpin(vma);
+out_ww:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&ww);
if (err)
goto out_unmap;
}
diff --git a/drivers/gpu/drm/i915/gt/selftest_rps.c b/drivers/gpu/drm/i915/gt/selftest_rps.c
index bb753f0c12eb..ec1cfcfa0706 100644
--- a/drivers/gpu/drm/i915/gt/selftest_rps.c
+++ b/drivers/gpu/drm/i915/gt/selftest_rps.c
@@ -77,20 +77,20 @@ create_spin_counter(struct intel_engine_cs *engine,
vma = i915_vma_instance(obj, vm, NULL);
if (IS_ERR(vma)) {
- i915_gem_object_put(obj);
- return vma;
+ err = PTR_ERR(vma);
+ goto err_put;
}
err = i915_vma_pin(vma, 0, 0, PIN_USER);
- if (err) {
- i915_vma_put(vma);
- return ERR_PTR(err);
- }
+ if (err)
+ goto err_unlock;
+
+ i915_vma_lock(vma);
base = i915_gem_object_pin_map(obj, I915_MAP_WC);
if (IS_ERR(base)) {
- i915_gem_object_put(obj);
- return ERR_CAST(base);
+ err = PTR_ERR(base);
+ goto err_unpin;
}
cs = base;
@@ -134,6 +134,14 @@ create_spin_counter(struct intel_engine_cs *engine,
*cancel = base + loop;
*counter = srm ? memset32(base + end, 0, 1) : NULL;
return vma;
+
+err_unpin:
+ i915_vma_unpin(vma);
+err_unlock:
+ i915_vma_unlock(vma);
+err_put:
+ i915_gem_object_put(obj);
+ return ERR_PTR(err);
}
static u8 wait_for_freq(struct intel_rps *rps, u8 freq, int timeout_ms)
@@ -639,7 +647,6 @@ int live_rps_frequency_cs(void *arg)
goto err_vma;
}
- i915_vma_lock(vma);
err = i915_request_await_object(rq, vma->obj, false);
if (!err)
err = i915_vma_move_to_active(vma, rq, 0);
@@ -647,7 +654,6 @@ int live_rps_frequency_cs(void *arg)
err = rq->engine->emit_bb_start(rq,
vma->node.start,
PAGE_SIZE, 0);
- i915_vma_unlock(vma);
i915_request_add(rq);
if (err)
goto err_vma;
@@ -708,6 +714,7 @@ int live_rps_frequency_cs(void *arg)
i915_gem_object_flush_map(vma->obj);
i915_gem_object_unpin_map(vma->obj);
i915_vma_unpin(vma);
+ i915_vma_unlock(vma);
i915_vma_put(vma);
st_engine_heartbeat_enable(engine);
@@ -781,7 +788,6 @@ int live_rps_frequency_srm(void *arg)
goto err_vma;
}
- i915_vma_lock(vma);
err = i915_request_await_object(rq, vma->obj, false);
if (!err)
err = i915_vma_move_to_active(vma, rq, 0);
@@ -789,7 +795,6 @@ int live_rps_frequency_srm(void *arg)
err = rq->engine->emit_bb_start(rq,
vma->node.start,
PAGE_SIZE, 0);
- i915_vma_unlock(vma);
i915_request_add(rq);
if (err)
goto err_vma;
@@ -849,6 +854,7 @@ int live_rps_frequency_srm(void *arg)
i915_gem_object_flush_map(vma->obj);
i915_gem_object_unpin_map(vma->obj);
i915_vma_unpin(vma);
+ i915_vma_unlock(vma);
i915_vma_put(vma);
st_engine_heartbeat_enable(engine);
diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c
index 9271aad7f779..07311437330f 100644
--- a/drivers/gpu/drm/i915/selftests/i915_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_request.c
@@ -862,6 +862,8 @@ static int live_all_engines(void *arg)
goto out_free;
}
+ i915_vma_lock(batch);
+
idx = 0;
for_each_uabi_engine(engine, i915) {
request[idx] = intel_engine_create_kernel_request(engine);
@@ -872,11 +874,9 @@ static int live_all_engines(void *arg)
goto out_request;
}
- i915_vma_lock(batch);
err = i915_request_await_object(request[idx], batch->obj, 0);
if (err == 0)
err = i915_vma_move_to_active(batch, request[idx], 0);
- i915_vma_unlock(batch);
GEM_BUG_ON(err);
err = engine->emit_bb_start(request[idx],
@@ -891,6 +891,8 @@ static int live_all_engines(void *arg)
idx++;
}
+ i915_vma_unlock(batch);
+
idx = 0;
for_each_uabi_engine(engine, i915) {
if (i915_request_completed(request[idx])) {
@@ -981,12 +983,13 @@ static int live_sequential_engines(void *arg)
goto out_free;
}
+ i915_vma_lock(batch);
request[idx] = intel_engine_create_kernel_request(engine);
if (IS_ERR(request[idx])) {
err = PTR_ERR(request[idx]);
pr_err("%s: Request allocation failed for %s with err=%d\n",
__func__, engine->name, err);
- goto out_request;
+ goto out_unlock;
}
if (prev) {
@@ -996,16 +999,14 @@ static int live_sequential_engines(void *arg)
i915_request_add(request[idx]);
pr_err("%s: Request await failed for %s with err=%d\n",
__func__, engine->name, err);
- goto out_request;
+ goto out_unlock;
}
}
- i915_vma_lock(batch);
err = i915_request_await_object(request[idx],
batch->obj, false);
if (err == 0)
err = i915_vma_move_to_active(batch, request[idx], 0);
- i915_vma_unlock(batch);
GEM_BUG_ON(err);
err = engine->emit_bb_start(request[idx],
@@ -1020,6 +1021,11 @@ static int live_sequential_engines(void *arg)
prev = request[idx];
idx++;
+
+out_unlock:
+ i915_vma_unlock(batch);
+ if (err)
+ goto out_request;
}
idx = 0;
--
2.27.0
More information about the Intel-gfx
mailing list