From 5cfa856c3ad5f4c0c71429d9aea59af551ce04bd Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@chromium.org>
Date: Mon, 27 Sep 2021 11:00:04 -0700
Subject: drm/msm/a6xx: Serialize GMU communication
Git-commit: f6f59072e821901d96c791864a07d57d8ec8d312
Patch-mainline: v5.15-rc6
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

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@chromium.org>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 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(-)

--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -296,6 +296,8 @@
 	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 @@
 {
 	int bit;
 
+	WARN_ON_ONCE(!mutex_is_locked(&gmu->lock));
+
 	if (state >= ARRAY_SIZE(a6xx_gmu_oob_bits))
 		return;
 
@@ -1478,6 +1482,8 @@
 	if (!pdev)
 		return -ENODEV;
 
+	mutex_init(&gmu->lock);
+
 	gmu->dev = &pdev->dev;
 
 	of_dma_configure(gmu->dev, node, true);
--- 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 {
 	struct device *dev;
 
+	/* For serializing communication with the GMU: */
+	struct mutex lock;
+
 	struct msm_gem_address_space *aspace;
 
 	void * __iomem mmio;
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -859,7 +859,7 @@
 	  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);
@@ -1107,6 +1107,19 @@
 	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",
@@ -1481,7 +1494,9 @@
 
 	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;
 
@@ -1504,7 +1519,9 @@
 
 	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;
 
@@ -1519,18 +1536,19 @@
 {
 	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;
 }
 
@@ -1594,6 +1612,16 @@
 	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)
 {
@@ -1740,7 +1768,7 @@
 #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,