[Freedreno] [PATCH 5/6] drm/msm/adreno: Add ringbuffer contexts to the GPU state

[Jordan Crouse]

Add the contents of each ringbuffer to the GPU state and dump the
data in the crash file encoded with ascii85. To save space only
the used portions of the ringbuffer are saved.

Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 44 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/msm_gpu.h           |  2 ++
 2 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 9e83c70..79df82b 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -17,6 +17,7 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/ascii85.h>
 #include <linux/pm_opp.h>
 #include "adreno_gpu.h"
 #include "msm_gem.h"
@@ -377,10 +378,29 @@ struct msm_gpu_state *adreno_gpu_state_get(struct msm_gpu *gpu)
 	do_gettimeofday(&state->time);
 
 	for (i = 0; i < gpu->nr_rings; i++) {
+		int size = 0, j;
+
 		state->ring[i].fence = gpu->rb[i]->memptrs->fence;
 		state->ring[i].seqno = gpu->rb[i]->seqno;
 		state->ring[i].rptr = get_rptr(adreno_gpu, gpu->rb[i]);
 		state->ring[i].wptr = get_wptr(gpu->rb[i]);
+
+		/*
+		 * Only copy used parts of the ring buffers (this should save
+		 * data size for lightly used rings)
+		 */
+		for(j = 0; j < MSM_GPU_RINGBUFFER_SZ >> 2; j++)
+			if (gpu->rb[i]->start[j])
+				size = j;
+
+		if (size) {
+			state->ring[i].data = kmalloc((size + 1) << 2, GFP_KERNEL);
+			if (state->ring[i].data) {
+				memcpy(state->ring[i].data, gpu->rb[i]->start,
+				(size + 1) << 2);
+				state->ring[i].data_size = (size + 1) << 2;
+			}
+		}
 	}
 
 	/* Count the number of registers */
@@ -411,9 +431,13 @@ struct msm_gpu_state *adreno_gpu_state_get(struct msm_gpu *gpu)
 
 static void adreno_gpu_state_destroy(struct kref *kref)
 {
+	int i;
 	struct msm_gpu_state *state = container_of(kref,
 		struct msm_gpu_state, ref);
 
+	for(i = 0; i < ARRAY_SIZE(state->ring); i++)
+		kfree(state->ring[i].data);
+
 	kfree(state->comm);
 	kfree(state->cmd);
 	kfree(state->registers);
@@ -453,6 +477,26 @@ void adreno_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
 		seq_printf(m, "    retired-fence: %d\n", state->ring[i].fence);
 		seq_printf(m, "    rptr: %d\n", state->ring[i].rptr);
 		seq_printf(m, "    wptr: %d\n", state->ring[i].wptr);
+		seq_printf(m, "    size: %d\n", MSM_GPU_RINGBUFFER_SZ);
+
+		if (state->ring[i].data && state->ring[i].data_size) {
+			u32 *ptr = (u32 *) state->ring[i].data;
+			char out[6];
+			int len = ascii85_encode_len(state->ring[i].data_size);
+			int j;
+
+			seq_printf(m, "    data: !!ascii85 |\n");
+			seq_printf(m, "     ");
+
+			for(j = 0; j < len; j++) {
+				if (ascii85_encode(ptr[j], out))
+					seq_printf(m, out);
+				else
+					seq_printf(m, "z");
+			}
+
+			seq_printf(m, "\n");
+		}
 	}
 
 	seq_printf(m, "registers:\n");
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 23e3b06..e13b23b 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -188,6 +188,8 @@ struct msm_gpu_state {
 		u32 seqno;
 		u32 rptr;
 		u32 wptr;
+		void *data;
+		int data_size;
 	} ring[MSM_GPU_MAX_RINGS];
 
 	int nr_registers;
-- 
1.9.1