drm/v3d: Create a CPU job extension to copy timestamp query to a buffer

A CPU job is a type of job that performs operations that requires CPU
intervention. A copy timestamp query job is a job that copy the complete
or partial result of a query to a buffer. As V3D doesn't provide any
mechanism to obtain a timestamp from the GPU, it is a job that needs
CPU intervention.

So, create a user extension for the CPU job that enables the creation
of a copy timestamp query job. This user extension will allow the creation
of a CPU job that copy the results of a timestamp query to a BO with the
possibility to indicate the timestamp availability with a availability bit.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231130164420.932823-17-mcanal@igalia.com

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index 3988407635ed..5058a354fffd 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -320,6 +320,7 @@ enum v3d_cpu_job_type {
 	V3D_CPU_JOB_TYPE_INDIRECT_CSD = 1,
 	V3D_CPU_JOB_TYPE_TIMESTAMP_QUERY,
 	V3D_CPU_JOB_TYPE_RESET_TIMESTAMP_QUERY,
+	V3D_CPU_JOB_TYPE_COPY_TIMESTAMP_QUERY,
 };
 
 struct v3d_timestamp_query {
@@ -361,6 +362,23 @@ struct v3d_timestamp_query_info {
 	u32 count;
 };
 
+struct v3d_copy_query_results_info {
+	/* Define if should write to buffer using 64 or 32 bits */
+	bool do_64bit;
+
+	/* Define if it can write to buffer even if the query is not available */
+	bool do_partial;
+
+	/* Define if it should write availability bit to buffer */
+	bool availability_bit;
+
+	/* Offset of the copy buffer in the BO */
+	u32 offset;
+
+	/* Stride of the copy buffer in the BO */
+	u32 stride;
+};
+
 struct v3d_cpu_job {
 	struct v3d_job base;
 
@@ -369,6 +387,8 @@ struct v3d_cpu_job {
 	struct v3d_indirect_csd_info indirect_csd;
 
 	struct v3d_timestamp_query_info timestamp_query;
+
+	struct v3d_copy_query_results_info copy;
 };
 
 typedef void (*v3d_cpu_job_fn)(struct v3d_cpu_job *);