[Intel-gfx] [PATCH 14/23] drm/i915: Convert i915_gem_object/client_blt.c to use ww locking as well, v2.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Mon May 11 14:29:29 UTC 2020
This is the last part outside of selftests that still don't use the
correct lock ordering of timeline->mutex vs resv_lock.
With gem fixed, there are a few places that still get locking wrong:
- gvt/scheduler.c
- i915_perf.c
- Most if not all selftests.
Changes since v1:
- Add intel_engine_pm_get/put() calls to fix use-after-free when using
intel_engine_get_pool().
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
.../gpu/drm/i915/gem/i915_gem_client_blt.c | 78 +++++++--
.../gpu/drm/i915/gem/i915_gem_object_blt.c | 156 +++++++++++-------
.../gpu/drm/i915/gem/i915_gem_object_blt.h | 3 +
3 files changed, 164 insertions(+), 73 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c b/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
index c182091c00ff..c141d7ce8a75 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
@@ -156,6 +156,7 @@ static void clear_pages_worker(struct work_struct *work)
struct clear_pages_work *w = container_of(work, typeof(*w), work);
struct drm_i915_gem_object *obj = w->sleeve->vma->obj;
struct i915_vma *vma = w->sleeve->vma;
+ struct i915_gem_ww_ctx ww;
struct i915_request *rq;
struct i915_vma *batch;
int err = w->dma.error;
@@ -171,17 +172,20 @@ static void clear_pages_worker(struct work_struct *work)
obj->read_domains = I915_GEM_GPU_DOMAINS;
obj->write_domain = 0;
- err = i915_vma_pin(vma, 0, 0, PIN_USER);
- if (unlikely(err))
+ i915_gem_ww_ctx_init(&ww, false);
+ intel_engine_pm_get(w->ce->engine);
+retry:
+ err = intel_context_pin_ww(w->ce, &ww);
+ if (err)
goto out_signal;
- batch = intel_emit_vma_fill_blt(w->ce, vma, w->value);
+ batch = intel_emit_vma_fill_blt(w->ce, vma, &ww, w->value);
if (IS_ERR(batch)) {
err = PTR_ERR(batch);
- goto out_unpin;
+ goto out_ctx;
}
- rq = intel_context_create_request(w->ce);
+ rq = i915_request_create(w->ce);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto out_batch;
@@ -223,9 +227,19 @@ static void clear_pages_worker(struct work_struct *work)
i915_request_add(rq);
out_batch:
intel_emit_vma_release(w->ce, batch);
-out_unpin:
- i915_vma_unpin(vma);
+out_ctx:
+ intel_context_unpin(w->ce);
out_signal:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&ww);
+
+ i915_vma_unpin(w->sleeve->vma);
+ intel_engine_pm_put(w->ce->engine);
+
if (unlikely(err)) {
dma_fence_set_error(&w->dma, err);
dma_fence_signal(&w->dma);
@@ -233,6 +247,44 @@ static void clear_pages_worker(struct work_struct *work)
}
}
+static int pin_wait_clear_pages_work(struct clear_pages_work *w,
+ struct intel_context *ce)
+{
+ struct i915_vma *vma = w->sleeve->vma;
+ struct i915_gem_ww_ctx ww;
+ int err;
+
+ i915_gem_ww_ctx_init(&ww, false);
+retry:
+ err = i915_gem_object_lock(vma->obj, &ww);
+ if (err)
+ goto out;
+
+ err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_USER);
+ if (unlikely(err))
+ goto out;
+
+ err = i915_sw_fence_await_reservation(&w->wait,
+ vma->obj->base.resv, NULL,
+ true, 0, I915_FENCE_GFP);
+ if (err)
+ goto err_unpin_vma;
+
+ dma_resv_add_excl_fence(vma->obj->base.resv, &w->dma);
+
+err_unpin_vma:
+ if (err)
+ i915_vma_unpin(vma);
+out:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&ww);
+ return err;
+}
+
static int __i915_sw_fence_call
clear_pages_work_notify(struct i915_sw_fence *fence,
enum i915_sw_fence_notify state)
@@ -286,17 +338,9 @@ int i915_gem_schedule_fill_pages_blt(struct drm_i915_gem_object *obj,
dma_fence_init(&work->dma, &clear_pages_work_ops, &fence_lock, 0, 0);
i915_sw_fence_init(&work->wait, clear_pages_work_notify);
- i915_gem_object_lock(obj, NULL);
- err = i915_sw_fence_await_reservation(&work->wait,
- obj->base.resv, NULL, true, 0,
- I915_FENCE_GFP);
- if (err < 0) {
+ err = pin_wait_clear_pages_work(work, ce);
+ if (err < 0)
dma_fence_set_error(&work->dma, err);
- } else {
- dma_resv_add_excl_fence(obj->base.resv, &work->dma);
- err = 0;
- }
- i915_gem_object_unlock(obj);
dma_fence_get(&work->dma);
i915_sw_fence_commit(&work->wait);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
index 8e7b6a1efd0c..1460e4b8271f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
@@ -14,6 +14,7 @@
struct i915_vma *intel_emit_vma_fill_blt(struct intel_context *ce,
struct i915_vma *vma,
+ struct i915_gem_ww_ctx *ww,
u32 value)
{
struct drm_i915_private *i915 = ce->vm->i915;
@@ -39,10 +40,24 @@ struct i915_vma *intel_emit_vma_fill_blt(struct intel_context *ce,
goto out_pm;
}
+ err = i915_gem_object_lock(pool->obj, ww);
+ if (err)
+ goto out_put;
+
+ batch = i915_vma_instance(pool->obj, ce->vm, NULL);
+ if (IS_ERR(batch)) {
+ err = PTR_ERR(batch);
+ goto out_put;
+ }
+
+ err = i915_vma_pin_ww(batch, ww, 0, 0, PIN_USER);
+ if (unlikely(err))
+ goto out_put;
+
cmd = i915_gem_object_pin_map(pool->obj, I915_MAP_WC);
if (IS_ERR(cmd)) {
err = PTR_ERR(cmd);
- goto out_put;
+ goto out_unpin;
}
rem = vma->size;
@@ -82,19 +97,11 @@ struct i915_vma *intel_emit_vma_fill_blt(struct intel_context *ce,
i915_gem_object_unpin_map(pool->obj);
- batch = i915_vma_instance(pool->obj, ce->vm, NULL);
- if (IS_ERR(batch)) {
- err = PTR_ERR(batch);
- goto out_put;
- }
-
- err = i915_vma_pin(batch, 0, 0, PIN_USER);
- if (unlikely(err))
- goto out_put;
-
batch->private = pool;
return batch;
+out_unpin:
+ i915_vma_unpin(batch);
out_put:
intel_gt_buffer_pool_put(pool);
out_pm:
@@ -106,11 +113,9 @@ int intel_emit_vma_mark_active(struct i915_vma *vma, struct i915_request *rq)
{
int err;
- 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 (unlikely(err))
return err;
@@ -128,6 +133,7 @@ int i915_gem_object_fill_blt(struct drm_i915_gem_object *obj,
struct intel_context *ce,
u32 value)
{
+ struct i915_gem_ww_ctx ww;
struct i915_request *rq;
struct i915_vma *batch;
struct i915_vma *vma;
@@ -137,23 +143,31 @@ int i915_gem_object_fill_blt(struct drm_i915_gem_object *obj,
if (IS_ERR(vma))
return PTR_ERR(vma);
- err = i915_vma_pin(vma, 0, 0, PIN_USER);
- if (unlikely(err))
- return err;
+ i915_gem_ww_ctx_init(&ww, true);
+ intel_engine_pm_get(ce->engine);
+retry:
+ err = i915_gem_object_lock(obj, &ww);
+ if (err)
+ goto out;
+
+ err = intel_context_pin_ww(ce, &ww);
+ if (err)
+ goto out;
- if (obj->cache_dirty & ~obj->cache_coherent) {
- i915_gem_object_lock(obj, NULL);
+ err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_USER);
+ if (err)
+ goto out_ctx;
+
+ if (obj->cache_dirty & ~obj->cache_coherent)
i915_gem_clflush_object(obj, 0);
- i915_gem_object_unlock(obj);
- }
- batch = intel_emit_vma_fill_blt(ce, vma, value);
+ batch = intel_emit_vma_fill_blt(ce, vma, &ww, value);
if (IS_ERR(batch)) {
err = PTR_ERR(batch);
- goto out_unpin;
+ goto out_vma;
}
- rq = intel_context_create_request(ce);
+ rq = i915_request_create(ce);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto out_batch;
@@ -173,11 +187,9 @@ int i915_gem_object_fill_blt(struct drm_i915_gem_object *obj,
goto out_request;
}
- 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);
if (unlikely(err))
goto out_request;
@@ -191,8 +203,18 @@ int i915_gem_object_fill_blt(struct drm_i915_gem_object *obj,
i915_request_add(rq);
out_batch:
intel_emit_vma_release(ce, batch);
-out_unpin:
+out_vma:
i915_vma_unpin(vma);
+out_ctx:
+ intel_context_unpin(ce);
+out:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&ww);
+ intel_engine_pm_put(ce->engine);
return err;
}
@@ -208,6 +230,7 @@ static bool wa_1209644611_applies(struct drm_i915_private *i915, u32 size)
}
struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
+ struct i915_gem_ww_ctx *ww,
struct i915_vma *src,
struct i915_vma *dst)
{
@@ -234,10 +257,24 @@ struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
goto out_pm;
}
+ err = i915_gem_object_lock(pool->obj, ww);
+ if (err)
+ goto out_put;
+
+ batch = i915_vma_instance(pool->obj, ce->vm, NULL);
+ if (IS_ERR(batch)) {
+ err = PTR_ERR(batch);
+ goto out_put;
+ }
+
+ err = i915_vma_pin_ww(batch, ww, 0, 0, PIN_USER);
+ if (unlikely(err))
+ goto out_put;
+
cmd = i915_gem_object_pin_map(pool->obj, I915_MAP_WC);
if (IS_ERR(cmd)) {
err = PTR_ERR(cmd);
- goto out_put;
+ goto out_unpin;
}
rem = src->size;
@@ -293,19 +330,11 @@ struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
i915_gem_object_unpin_map(pool->obj);
- batch = i915_vma_instance(pool->obj, ce->vm, NULL);
- if (IS_ERR(batch)) {
- err = PTR_ERR(batch);
- goto out_put;
- }
-
- err = i915_vma_pin(batch, 0, 0, PIN_USER);
- if (unlikely(err))
- goto out_put;
-
batch->private = pool;
return batch;
+out_unpin:
+ i915_vma_unpin(batch);
out_put:
intel_gt_buffer_pool_put(pool);
out_pm:
@@ -327,10 +356,9 @@ int i915_gem_object_copy_blt(struct drm_i915_gem_object *src,
struct drm_i915_gem_object *dst,
struct intel_context *ce)
{
- struct drm_gem_object *objs[] = { &src->base, &dst->base };
struct i915_address_space *vm = ce->vm;
struct i915_vma *vma[2], *batch;
- struct ww_acquire_ctx acquire;
+ struct i915_gem_ww_ctx ww;
struct i915_request *rq;
int err, i;
@@ -338,25 +366,36 @@ int i915_gem_object_copy_blt(struct drm_i915_gem_object *src,
if (IS_ERR(vma[0]))
return PTR_ERR(vma[0]);
- err = i915_vma_pin(vma[0], 0, 0, PIN_USER);
- if (unlikely(err))
- return err;
-
vma[1] = i915_vma_instance(dst, vm, NULL);
if (IS_ERR(vma[1]))
- goto out_unpin_src;
+ return PTR_ERR(vma);
- err = i915_vma_pin(vma[1], 0, 0, PIN_USER);
+ i915_gem_ww_ctx_init(&ww, true);
+ intel_engine_pm_get(ce->engine);
+retry:
+ err = i915_gem_object_lock(src, &ww);
+ if (!err)
+ err = i915_gem_object_lock(dst, &ww);
+ if (!err)
+ err = intel_context_pin_ww(ce, &ww);
+ if (err)
+ goto out;
+
+ err = i915_vma_pin_ww(vma[0], &ww, 0, 0, PIN_USER);
+ if (err)
+ goto out_ctx;
+
+ err = i915_vma_pin_ww(vma[1], &ww, 0, 0, PIN_USER);
if (unlikely(err))
goto out_unpin_src;
- batch = intel_emit_vma_copy_blt(ce, vma[0], vma[1]);
+ batch = intel_emit_vma_copy_blt(ce, &ww, vma[0], vma[1]);
if (IS_ERR(batch)) {
err = PTR_ERR(batch);
goto out_unpin_dst;
}
- rq = intel_context_create_request(ce);
+ rq = i915_request_create(ce);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto out_batch;
@@ -366,14 +405,10 @@ int i915_gem_object_copy_blt(struct drm_i915_gem_object *src,
if (unlikely(err))
goto out_request;
- err = drm_gem_lock_reservations(objs, ARRAY_SIZE(objs), &acquire);
- if (unlikely(err))
- goto out_request;
-
for (i = 0; i < ARRAY_SIZE(vma); i++) {
err = move_to_gpu(vma[i], rq, i);
if (unlikely(err))
- goto out_unlock;
+ goto out_request;
}
for (i = 0; i < ARRAY_SIZE(vma); i++) {
@@ -381,20 +416,19 @@ int i915_gem_object_copy_blt(struct drm_i915_gem_object *src,
err = i915_vma_move_to_active(vma[i], rq, flags);
if (unlikely(err))
- goto out_unlock;
+ goto out_request;
}
if (rq->engine->emit_init_breadcrumb) {
err = rq->engine->emit_init_breadcrumb(rq);
if (unlikely(err))
- goto out_unlock;
+ goto out_request;
}
err = rq->engine->emit_bb_start(rq,
batch->node.start, batch->node.size,
0);
-out_unlock:
- drm_gem_unlock_reservations(objs, ARRAY_SIZE(objs), &acquire);
+
out_request:
if (unlikely(err))
i915_request_set_error_once(rq, err);
@@ -406,6 +440,16 @@ int i915_gem_object_copy_blt(struct drm_i915_gem_object *src,
i915_vma_unpin(vma[1]);
out_unpin_src:
i915_vma_unpin(vma[0]);
+out_ctx:
+ intel_context_unpin(ce);
+out:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&ww);
+ intel_engine_pm_put(ce->engine);
return err;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.h b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.h
index 8bcd336a90dc..2409fdcccf0e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.h
@@ -13,12 +13,15 @@
#include "i915_vma.h"
struct drm_i915_gem_object;
+struct i915_gem_ww_ctx;
struct i915_vma *intel_emit_vma_fill_blt(struct intel_context *ce,
struct i915_vma *vma,
+ struct i915_gem_ww_ctx *ww,
u32 value);
struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
+ struct i915_gem_ww_ctx *ww,
struct i915_vma *src,
struct i915_vma *dst);
--
2.26.2
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