[PATCH 04/13] drm/i915: Remove locking from i915_gem_object_prepare_read/write
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Mon Jan 13 17:10:43 UTC 2020
Execbuffer submission will perform its own WW locking, and we
cannot rely on the implicit lock there.
This also makes it clear that the GVT code will get a lockdep splat when
multiple batchbuffer shadows need to be performed in the same instance,
fix that up.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_domain.c | 20 ++++++-------------
drivers/gpu/drm/i915/gem/i915_gem_object.h | 1 -
.../gpu/drm/i915/gem/selftests/huge_pages.c | 5 ++++-
.../i915/gem/selftests/i915_gem_coherency.c | 14 +++++++++----
.../drm/i915/gem/selftests/i915_gem_context.c | 12 ++++++++---
drivers/gpu/drm/i915/gt/intel_renderstate.c | 9 +++++++--
drivers/gpu/drm/i915/gvt/cmd_parser.c | 9 ++++++++-
drivers/gpu/drm/i915/i915_gem.c | 8 +++++++-
8 files changed, 51 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
index f4602faa8db9..e9d3b587f562 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c
@@ -581,19 +581,17 @@ int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
if (!i915_gem_object_has_struct_page(obj))
return -ENODEV;
- ret = i915_gem_object_lock_interruptible(obj, NULL);
- if (ret)
- return ret;
+ assert_object_held(obj);
ret = i915_gem_object_wait(obj,
I915_WAIT_INTERRUPTIBLE,
MAX_SCHEDULE_TIMEOUT);
if (ret)
- goto err_unlock;
+ return ret;
ret = i915_gem_object_pin_pages(obj);
if (ret)
- goto err_unlock;
+ return ret;
if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ ||
!static_cpu_has(X86_FEATURE_CLFLUSH)) {
@@ -621,8 +619,6 @@ int i915_gem_object_prepare_read(struct drm_i915_gem_object *obj,
err_unpin:
i915_gem_object_unpin_pages(obj);
-err_unlock:
- i915_gem_object_unlock(obj);
return ret;
}
@@ -635,20 +631,18 @@ int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
if (!i915_gem_object_has_struct_page(obj))
return -ENODEV;
- ret = i915_gem_object_lock_interruptible(obj, NULL);
- if (ret)
- return ret;
+ assert_object_held(obj);
ret = i915_gem_object_wait(obj,
I915_WAIT_INTERRUPTIBLE |
I915_WAIT_ALL,
MAX_SCHEDULE_TIMEOUT);
if (ret)
- goto err_unlock;
+ return ret;
ret = i915_gem_object_pin_pages(obj);
if (ret)
- goto err_unlock;
+ return ret;
if (obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE ||
!static_cpu_has(X86_FEATURE_CLFLUSH)) {
@@ -685,7 +679,5 @@ int i915_gem_object_prepare_write(struct drm_i915_gem_object *obj,
err_unpin:
i915_gem_object_unpin_pages(obj);
-err_unlock:
- i915_gem_object_unlock(obj);
return ret;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index f0a293c1fc82..c68b85775a9e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -428,7 +428,6 @@ static inline void
i915_gem_object_finish_access(struct drm_i915_gem_object *obj)
{
i915_gem_object_unpin_pages(obj);
- i915_gem_object_unlock(obj);
}
static inline struct intel_engine_cs *
diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index e5f98c14052d..8773b7e0834f 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -991,9 +991,10 @@ __cpu_check_shmem(struct drm_i915_gem_object *obj, u32 dword, u32 val)
unsigned long n;
int err;
+ i915_gem_object_lock(obj, NULL);
err = i915_gem_object_prepare_read(obj, &needs_flush);
if (err)
- return err;
+ goto err_unlock;
for (n = 0; n < obj->base.size >> PAGE_SHIFT; ++n) {
u32 *ptr = kmap_atomic(i915_gem_object_get_page(obj, n));
@@ -1013,6 +1014,8 @@ __cpu_check_shmem(struct drm_i915_gem_object *obj, u32 dword, u32 val)
}
i915_gem_object_finish_access(obj);
+err_unlock:
+ i915_gem_object_unlock(obj);
return err;
}
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 f5a0c7b1e113..99f8466a108a 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c
@@ -27,9 +27,10 @@ static int cpu_set(struct context *ctx, unsigned long offset, u32 v)
u32 *cpu;
int err;
+ i915_gem_object_lock(ctx->obj, NULL);
err = i915_gem_object_prepare_write(ctx->obj, &needs_clflush);
if (err)
- return err;
+ goto out;
page = i915_gem_object_get_page(ctx->obj, offset >> PAGE_SHIFT);
map = kmap_atomic(page);
@@ -46,7 +47,9 @@ static int cpu_set(struct context *ctx, unsigned long offset, u32 v)
kunmap_atomic(map);
i915_gem_object_finish_access(ctx->obj);
- return 0;
+out:
+ i915_gem_object_unlock(ctx->obj);
+ return err;
}
static int cpu_get(struct context *ctx, unsigned long offset, u32 *v)
@@ -57,9 +60,10 @@ static int cpu_get(struct context *ctx, unsigned long offset, u32 *v)
u32 *cpu;
int err;
+ i915_gem_object_lock(ctx->obj, NULL);
err = i915_gem_object_prepare_read(ctx->obj, &needs_clflush);
if (err)
- return err;
+ goto out;
page = i915_gem_object_get_page(ctx->obj, offset >> PAGE_SHIFT);
map = kmap_atomic(page);
@@ -73,7 +77,9 @@ static int cpu_get(struct context *ctx, unsigned long offset, u32 *v)
kunmap_atomic(map);
i915_gem_object_finish_access(ctx->obj);
- return 0;
+out:
+ i915_gem_object_unlock(ctx->obj);
+ return err;
}
static int gtt_set(struct context *ctx, unsigned long offset, u32 v)
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index 67426c20ffb1..b56ebf1b0aed 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -461,9 +461,10 @@ static int cpu_fill(struct drm_i915_gem_object *obj, u32 value)
unsigned int n, m, need_flush;
int err;
+ i915_gem_object_lock(obj, NULL);
err = i915_gem_object_prepare_write(obj, &need_flush);
if (err)
- return err;
+ goto out;
for (n = 0; n < real_page_count(obj); n++) {
u32 *map;
@@ -479,7 +480,9 @@ static int cpu_fill(struct drm_i915_gem_object *obj, u32 value)
i915_gem_object_finish_access(obj);
obj->read_domains = I915_GEM_DOMAIN_GTT | I915_GEM_DOMAIN_CPU;
obj->write_domain = 0;
- return 0;
+out:
+ i915_gem_object_unlock(obj);
+ return err;
}
static noinline int cpu_check(struct drm_i915_gem_object *obj,
@@ -488,9 +491,10 @@ static noinline int cpu_check(struct drm_i915_gem_object *obj,
unsigned int n, m, needs_flush;
int err;
+ i915_gem_object_lock(obj, NULL);
err = i915_gem_object_prepare_read(obj, &needs_flush);
if (err)
- return err;
+ goto out_unlock;
for (n = 0; n < real_page_count(obj); n++) {
u32 *map;
@@ -527,6 +531,8 @@ static noinline int cpu_check(struct drm_i915_gem_object *obj,
}
i915_gem_object_finish_access(obj);
+out_unlock:
+ i915_gem_object_unlock(obj);
return err;
}
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.c b/drivers/gpu/drm/i915/gt/intel_renderstate.c
index 5954ecc3207f..81834a7ee428 100644
--- a/drivers/gpu/drm/i915/gt/intel_renderstate.c
+++ b/drivers/gpu/drm/i915/gt/intel_renderstate.c
@@ -196,6 +196,8 @@ int intel_renderstate_init(struct intel_renderstate *so,
if (err)
goto err_vma;
+ i915_gem_object_lock(so->vma->obj, NULL);
+
err = render_state_setup(so, engine->i915);
if (err)
goto err_unpin;
@@ -203,6 +205,7 @@ int intel_renderstate_init(struct intel_renderstate *so,
return 0;
err_unpin:
+ i915_gem_object_unlock(so->vma->obj);
i915_vma_unpin(so->vma);
err_vma:
i915_vma_close(so->vma);
@@ -235,16 +238,18 @@ int intel_renderstate_emit(struct intel_renderstate *so,
return err;
}
- i915_vma_lock(so->vma);
err = i915_request_await_object(rq, so->vma->obj, false);
if (err == 0)
err = i915_vma_move_to_active(so->vma, rq, 0);
- i915_vma_unlock(so->vma);
return err;
}
void intel_renderstate_fini(struct intel_renderstate *so)
{
+ if (!so->vma)
+ return;
+
+ i915_gem_object_unlock(so->vma->obj);
i915_vma_unpin_and_release(&so->vma, 0);
}
diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index a54d96a144be..5d17ee2bdb9b 100644
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -1865,10 +1865,14 @@ static int perform_bb_shadow(struct parser_exec_state *s)
goto err_free_bb;
}
- ret = i915_gem_object_prepare_write(bb->obj, &bb->clflush);
+ ret = i915_gem_object_lock_interruptible(bb->obj, NULL);
if (ret)
goto err_free_obj;
+ ret = i915_gem_object_prepare_write(bb->obj, &bb->clflush);
+ if (ret)
+ goto err_unlock;
+
bb->va = i915_gem_object_pin_map(bb->obj, I915_MAP_WB);
if (IS_ERR(bb->va)) {
ret = PTR_ERR(bb->va);
@@ -1893,6 +1897,7 @@ static int perform_bb_shadow(struct parser_exec_state *s)
if (ret)
goto err_unmap;
+ i915_gem_object_unlock(bb->obj);
INIT_LIST_HEAD(&bb->list);
list_add(&bb->list, &s->workload->shadow_bb);
@@ -1919,6 +1924,8 @@ static int perform_bb_shadow(struct parser_exec_state *s)
i915_gem_object_unpin_map(bb->obj);
err_finish_shmem_access:
i915_gem_object_finish_access(bb->obj);
+err_unlock:
+ i915_gem_object_unlock(bb->obj);
err_free_obj:
i915_gem_object_put(bb->obj);
err_free_bb:
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1e93be8b6ae6..4173db8361c9 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -518,15 +518,21 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
if (ret)
goto out;
- ret = i915_gem_object_pin_pages(obj);
+ ret = i915_gem_object_lock_interruptible(obj, NULL);
if (ret)
goto out;
+ ret = i915_gem_object_pin_pages(obj);
+ if (ret)
+ goto out_unlock;
+
ret = i915_gem_shmem_pread(obj, args);
if (ret == -EFAULT || ret == -ENODEV)
ret = i915_gem_gtt_pread(obj, args);
i915_gem_object_unpin_pages(obj);
+out_unlock:
+ i915_gem_object_unlock(obj);
out:
i915_gem_object_put(obj);
return ret;
--
2.24.1
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