[PATCH v3 2/2] drm/msm/a6xx: Capture gmu log in devcoredump

[Akhil P Oommen <akhilpo@xxxxxxxxxxxxxx>]

Capture gmu log in coredump to enhance debugging.

Signed-off-by: Akhil P Oommen <akhilpo@xxxxxxxxxxxxxx>
---

Changes in v3:
- Fix style and a minor suggestion from Bjorn

Changes in v2:
- Fix kernel test robot's warning about size_t's format specifier

 drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 40 +++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/adreno/adreno_gpu.c     |  4 +--
 drivers/gpu/drm/msm/adreno/adreno_gpu.h     |  2 ++
 3 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
index 7501849..ad8e77a 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
@@ -42,6 +42,8 @@ struct a6xx_gpu_state {
 	struct a6xx_gpu_state_obj *cx_debugbus;
 	int nr_cx_debugbus;
 
+	struct msm_gpu_state_bo *gmu_log;
+
 	struct list_head objs;
 };
 
@@ -800,6 +802,29 @@ static void a6xx_get_gmu_registers(struct msm_gpu *gpu,
 		&a6xx_state->gmu_registers[2], false);
 }
 
+static void a6xx_get_gmu_log(struct msm_gpu *gpu,
+		struct a6xx_gpu_state *a6xx_state)
+{
+	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
+	struct msm_gpu_state_bo *gmu_log;
+
+	gmu_log = state_kcalloc(a6xx_state, 1, sizeof(*gmu_log));
+	if (!gmu_log)
+		return;
+
+	gmu_log->iova = gmu->log.iova;
+	gmu_log->size = gmu->log.size;
+	gmu_log->data = kvzalloc(gmu_log->size, GFP_KERNEL);
+	if (!gmu_log->data)
+		return;
+
+	memcpy(gmu_log->data, gmu->log.virt, gmu->log.size);
+
+	a6xx_state->gmu_log = gmu_log;
+}
+
 #define A6XX_GBIF_REGLIST_SIZE   1
 static void a6xx_get_registers(struct msm_gpu *gpu,
 		struct a6xx_gpu_state *a6xx_state,
@@ -937,6 +962,8 @@ struct msm_gpu_state *a6xx_gpu_state_get(struct msm_gpu *gpu)
 
 	a6xx_get_gmu_registers(gpu, a6xx_state);
 
+	a6xx_get_gmu_log(gpu, a6xx_state);
+
 	/* If GX isn't on the rest of the data isn't going to be accessible */
 	if (!a6xx_gmu_gx_is_on(&a6xx_gpu->gmu))
 		return &a6xx_state->base;
@@ -978,6 +1005,9 @@ static void a6xx_gpu_state_destroy(struct kref *kref)
 	struct a6xx_gpu_state *a6xx_state = container_of(state,
 			struct a6xx_gpu_state, base);
 
+	if (a6xx_state->gmu_log && a6xx_state->gmu_log->data)
+		kvfree(a6xx_state->gmu_log->data);
+
 	list_for_each_entry_safe(obj, tmp, &a6xx_state->objs, node)
 		kfree(obj);
 
@@ -1191,6 +1221,16 @@ void a6xx_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
 
 	adreno_show(gpu, state, p);
 
+	drm_puts(p, "gmu-log:\n");
+	if (a6xx_state->gmu_log) {
+		struct msm_gpu_state_bo *gmu_log = a6xx_state->gmu_log;
+
+		drm_printf(p, "    iova: 0x%016llx\n", gmu_log->iova);
+		drm_printf(p, "    size: %zu\n", gmu_log->size);
+		adreno_show_object(p, &gmu_log->data, gmu_log->size,
+				&gmu_log->encoded);
+	}
+
 	drm_puts(p, "registers:\n");
 	for (i = 0; i < a6xx_state->nr_registers; i++) {
 		struct a6xx_gpu_state_obj *obj = &a6xx_state->registers[i];
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 7486652..d7ffbb2 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -630,8 +630,8 @@ static char *adreno_gpu_ascii85_encode(u32 *src, size_t len)
 }
 
 /* len is expected to be in bytes */
-static void adreno_show_object(struct drm_printer *p, void **ptr, int len,
-		bool *encoded)
+void adreno_show_object(struct drm_printer *p, void **ptr, int len,
+		       bool *encoded)
 {
 	if (!*ptr || !len)
 		return;
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 225c277..6762308 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -306,6 +306,8 @@ void adreno_gpu_state_destroy(struct msm_gpu_state *state);
 
 int adreno_gpu_state_get(struct msm_gpu *gpu, struct msm_gpu_state *state);
 int adreno_gpu_state_put(struct msm_gpu_state *state);
+void adreno_show_object(struct drm_printer *p, void **ptr, int len,
+		bool *encoded);
 
 /*
  * Common helper function to initialize the default address space for arm-smmu
-- 
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