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Date: Fri, 1 Oct 2021 12:32:37 -0700
From: Rob Clark <robdclark@...il.com>
To: dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Rob Clark <robdclark@...omium.org>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jonathan Marek <jonathan@...ek.ca>,
Eric Anholt <eric@...olt.net>,
Jordan Crouse <jordan@...micpenguin.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
Akhil P Oommen <akhilpo@...eaurora.org>,
Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
Sharat Masetty <smasetty@...eaurora.org>,
Douglas Anderson <dianders@...omium.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/msm/a6xx: Serialize GMU communication
From: Rob Clark <robdclark@...omium.org>
I've seen some crashes in our crash reporting that *look* like multiple
threads stomping on each other while communicating with GMU. So wrap
all those paths in a lock.
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 ++++
drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 3 ++
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 40 +++++++++++++++++++++++----
3 files changed, 43 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index a7c58018959f..8b73f70766a4 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -296,6 +296,8 @@ int a6xx_gmu_set_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state)
u32 val;
int request, ack;
+ WARN_ON_ONCE(!mutex_is_locked(&gmu->lock));
+
if (state >= ARRAY_SIZE(a6xx_gmu_oob_bits))
return -EINVAL;
@@ -337,6 +339,8 @@ void a6xx_gmu_clear_oob(struct a6xx_gmu *gmu, enum a6xx_gmu_oob_state state)
{
int bit;
+ WARN_ON_ONCE(!mutex_is_locked(&gmu->lock));
+
if (state >= ARRAY_SIZE(a6xx_gmu_oob_bits))
return;
@@ -1482,6 +1486,8 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
if (!pdev)
return -ENODEV;
+ mutex_init(&gmu->lock);
+
gmu->dev = &pdev->dev;
of_dma_configure(gmu->dev, node, true);
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
index 3c74f64e3126..84bd516f01e8 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
@@ -44,6 +44,9 @@ struct a6xx_gmu_bo {
struct a6xx_gmu {
struct device *dev;
+ /* For serializing communication with the GMU: */
+ struct mutex lock;
+
struct msm_gem_address_space *aspace;
void * __iomem mmio;
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index f6a4dbef796b..bd7bdeff5d6f 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -881,7 +881,7 @@ static int a6xx_zap_shader_init(struct msm_gpu *gpu)
A6XX_RBBM_INT_0_MASK_UCHE_OOB_ACCESS | \
A6XX_RBBM_INT_0_MASK_UCHE_TRAP_INTR)
-static int a6xx_hw_init(struct msm_gpu *gpu)
+static int hw_init(struct msm_gpu *gpu)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
@@ -1135,6 +1135,19 @@ static int a6xx_hw_init(struct msm_gpu *gpu)
return ret;
}
+static int a6xx_hw_init(struct msm_gpu *gpu)
+{
+ struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+ struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+ int ret;
+
+ mutex_lock(&a6xx_gpu->gmu.lock);
+ ret = hw_init(gpu);
+ mutex_unlock(&a6xx_gpu->gmu.lock);
+
+ return ret;
+}
+
static void a6xx_dump(struct msm_gpu *gpu)
{
DRM_DEV_INFO(&gpu->pdev->dev, "status: %08x\n",
@@ -1509,7 +1522,9 @@ static int a6xx_pm_resume(struct msm_gpu *gpu)
trace_msm_gpu_resume(0);
+ mutex_lock(&a6xx_gpu->gmu.lock);
ret = a6xx_gmu_resume(a6xx_gpu);
+ mutex_unlock(&a6xx_gpu->gmu.lock);
if (ret)
return ret;
@@ -1532,7 +1547,9 @@ static int a6xx_pm_suspend(struct msm_gpu *gpu)
msm_devfreq_suspend(gpu);
+ mutex_lock(&a6xx_gpu->gmu.lock);
ret = a6xx_gmu_stop(a6xx_gpu);
+ mutex_unlock(&a6xx_gpu->gmu.lock);
if (ret)
return ret;
@@ -1547,18 +1564,19 @@ static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
- static DEFINE_MUTEX(perfcounter_oob);
- mutex_lock(&perfcounter_oob);
+ mutex_lock(&a6xx_gpu->gmu.lock);
/* Force the GPU power on so we can read this register */
a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_PERFCOUNTER_SET);
*value = gpu_read64(gpu, REG_A6XX_CP_ALWAYS_ON_COUNTER_LO,
- REG_A6XX_CP_ALWAYS_ON_COUNTER_HI);
+ REG_A6XX_CP_ALWAYS_ON_COUNTER_HI);
a6xx_gmu_clear_oob(&a6xx_gpu->gmu, GMU_OOB_PERFCOUNTER_SET);
- mutex_unlock(&perfcounter_oob);
+
+ mutex_unlock(&a6xx_gpu->gmu.lock);
+
return 0;
}
@@ -1622,6 +1640,16 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
return (unsigned long)busy_time;
}
+void a6xx_gpu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
+{
+ struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+ struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+
+ mutex_lock(&a6xx_gpu->gmu.lock);
+ a6xx_gmu_set_freq(gpu, opp);
+ mutex_unlock(&a6xx_gpu->gmu.lock);
+}
+
static struct msm_gem_address_space *
a6xx_create_address_space(struct msm_gpu *gpu, struct platform_device *pdev)
{
@@ -1766,7 +1794,7 @@ static const struct adreno_gpu_funcs funcs = {
#endif
.gpu_busy = a6xx_gpu_busy,
.gpu_get_freq = a6xx_gmu_get_freq,
- .gpu_set_freq = a6xx_gmu_set_freq,
+ .gpu_set_freq = a6xx_gpu_set_freq,
#if defined(CONFIG_DRM_MSM_GPU_STATE)
.gpu_state_get = a6xx_gpu_state_get,
.gpu_state_put = a6xx_gpu_state_put,
--
2.31.1
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