Expose the hardcoded timeout for unsignaled foreign fences as a Kconfig
option, primarily to allow brave systems to disable the timeout and
solely rely on correct signaling.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Acked-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
---
drivers/gpu/drm/i915/Kconfig.profile | 12 ++++++++++++
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/display/intel_display.c | 5 +++--
drivers/gpu/drm/i915/gem/i915_gem_clflush.c | 2 +-
drivers/gpu/drm/i915/gem/i915_gem_client_blt.c | 3 +--
drivers/gpu/drm/i915/gem/i915_gem_fence.c | 4 ++--
drivers/gpu/drm/i915/i915_config.c | 15 +++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 10 +++++++++-
drivers/gpu/drm/i915/i915_request.c | 3 ++-
9 files changed, 46 insertions(+), 9 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_config.c
diff --git a/drivers/gpu/drm/i915/Kconfig.profile b/drivers/gpu/drm/i915/Kconfig.profile
index 0bfd276c19fe..3925be65d314 100644
--- a/drivers/gpu/drm/i915/Kconfig.profile
+++ b/drivers/gpu/drm/i915/Kconfig.profile
@@ -1,3 +1,15 @@
+config DRM_I915_FENCE_TIMEOUT
+ int "Timeout for unsignaled foreign fences"
+ default 10000 # milliseconds
+ help
+ When listening to a foreign fence, we install a supplementary timer
+ to ensure that we are always signaled and our userspace is able to
+ make forward progress. This value specifies the timeout used for an
+ unsignaled foreign fence.
+
+ May be 0 to disable the timeout, and rely on the foreign fence being
+ eventually signaled.
+
config DRM_I915_USERFAULT_AUTOSUSPEND
int "Runtime autosuspend delay for userspace GGTT mmaps (ms)"
default 250 # milliseconds
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 5359c736c789..b0da6ea6e3f1 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -35,6 +35,7 @@ subdir-ccflags-y += -I$(srctree)/$(src)
# core driver code
i915-y += i915_drv.o \
+ i915_config.o \
i915_irq.o \
i915_getparam.o \
i915_params.o \
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index fd6d63b03489..432b4eeaf9f6 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -15814,7 +15814,7 @@ intel_prepare_plane_fb(struct drm_plane *_plane,
if (new_plane_state->uapi.fence) { /* explicit fencing */
ret = i915_sw_fence_await_dma_fence(&state->commit_ready,
new_plane_state->uapi.fence,
- I915_FENCE_TIMEOUT,
+ i915_fence_timeout(dev_priv),
GFP_KERNEL);
if (ret < 0)
return ret;
@@ -15841,7 +15841,8 @@ intel_prepare_plane_fb(struct drm_plane *_plane,
ret = i915_sw_fence_await_reservation(&state->commit_ready,
obj->base.resv, NULL,
- false, I915_FENCE_TIMEOUT,
+ false,
+ i915_fence_timeout(dev_priv),
GFP_KERNEL);
if (ret < 0)
goto unpin_fb;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
index 34be4c0ee7c5..bc0223716906 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
@@ -108,7 +108,7 @@ bool i915_gem_clflush_object(struct drm_i915_gem_object *obj,
if (clflush) {
i915_sw_fence_await_reservation(&clflush->base.chain,
obj->base.resv, NULL, true,
- I915_FENCE_TIMEOUT,
+ i915_fence_timeout(to_i915(obj->base.dev)),
I915_FENCE_GFP);
dma_resv_add_excl_fence(obj->base.resv, &clflush->base.dma);
dma_fence_work_commit(&clflush->base);
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 3a146aa2593b..d3a86a4d5c04 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_client_blt.c
@@ -288,8 +288,7 @@ int i915_gem_schedule_fill_pages_blt(struct drm_i915_gem_object *obj,
i915_gem_object_lock(obj);
err = i915_sw_fence_await_reservation(&work->wait,
- obj->base.resv, NULL,
- true, I915_FENCE_TIMEOUT,
+ obj->base.resv, NULL, true, 0,
I915_FENCE_GFP);
if (err < 0) {
dma_fence_set_error(&work->dma, err);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_fence.c b/drivers/gpu/drm/i915/gem/i915_gem_fence.c
index 2f6100ec2608..8ab842c80f99 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_fence.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_fence.c
@@ -72,8 +72,8 @@ i915_gem_object_lock_fence(struct drm_i915_gem_object *obj)
0, 0);
if (i915_sw_fence_await_reservation(&stub->chain,
- obj->base.resv, NULL,
- true, I915_FENCE_TIMEOUT,
+ obj->base.resv, NULL, true,
+ i915_fence_timeout(to_i915(obj->base.dev)),
I915_FENCE_GFP) < 0)
goto err;
diff --git a/drivers/gpu/drm/i915/i915_config.c b/drivers/gpu/drm/i915/i915_config.c
new file mode 100644
index 000000000000..b79b5f6d2cfa
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_config.c
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#include "i915_drv.h"
+
+unsigned long
+i915_fence_context_timeout(const struct drm_i915_private *i915, u64 context)
+{
+ if (context && IS_ACTIVE(CONFIG_DRM_I915_FENCE_TIMEOUT))
+ return msecs_to_jiffies_timeout(CONFIG_DRM_I915_FENCE_TIMEOUT);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6af69555733e..2e3b5c4d0759 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -614,8 +614,16 @@ struct i915_gem_mm {
#define I915_IDLE_ENGINES_TIMEOUT (200) /* in ms */
+unsigned long i915_fence_context_timeout(const struct drm_i915_private *i915,
+ u64 context);
+
+static inline unsigned long
+i915_fence_timeout(const struct drm_i915_private *i915)
+{
+ return i915_fence_context_timeout(i915, U64_MAX);
+}
+
#define I915_RESET_TIMEOUT (10 * HZ) /* 10s */
-#define I915_FENCE_TIMEOUT (10 * HZ) /* 10s */
#define I915_ENGINE_DEAD_TIMEOUT (4 * HZ) /* Seqno, head and subunits dead */
#define I915_SEQNO_DEAD_TIMEOUT (12 * HZ) /* Seqno dead with active head */
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 2c0de3a3b8e8..2d5b98549ddc 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1098,7 +1098,8 @@ __i915_request_await_external(struct i915_request *rq, struct dma_fence *fence)
{
mark_external(rq);
return i915_sw_fence_await_dma_fence(&rq->submit, fence,
- fence->context ? I915_FENCE_TIMEOUT : 0,
+ i915_fence_context_timeout(rq->i915,
+ fence->context),
I915_FENCE_GFP);
}
--
2.20.1
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