[14/17] drm/msm: Add a parameter query for the number of ringbuffers

Commit Message

Jordan Crouse July 27, 2017, 4:42 p.m. UTC

In order to manage ringbuffer priority to its fullest userspace
should know how many ringbuffers it has to work with. Add a
parameter to return the number of active rings.

Signed-off-by: Jordan Crouse <[e-mail]>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 3 +++
 include/uapi/drm/msm_drm.h              | 1 +
 2 files changed, 4 insertions(+)

Patch

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 5f62244..39ff842 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -50,6 +50,9 @@  int adreno_get_param(struct msm_gpu *gpu, uint32_t param, uint64_t *value)
 		if (adreno_gpu->funcs->get_timestamp)
 			return adreno_gpu->funcs->get_timestamp(gpu, value);
 		return -EINVAL;
+	case MSM_PARAM_NR_RINGS:
+		*value = gpu->nr_rings;
+		return 0;
 	default:
 		DBG("%s: invalid param: %u", gpu->name, param);
 		return -EINVAL;
diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h
index a06bf97..711ea30 100644
--- a/include/uapi/drm/msm_drm.h
+++ b/include/uapi/drm/msm_drm.h
@@ -73,6 +73,7 @@  struct drm_msm_timespec {
 #define MSM_PARAM_MAX_FREQ   0x04
 #define MSM_PARAM_TIMESTAMP  0x05
 #define MSM_PARAM_GMEM_BASE  0x06
+#define MSM_PARAM_NR_RINGS   0x07
 
 struct drm_msm_param {
 	__u32 pipe;           /* in, MSM_PIPE_x */