From: Rob Clark <robdclark@xxxxxxxxxxxx>
Normally this would be the same information that can be obtained in
other ways. But in some cases the process opening the drm fd is merely
a sort of proxy for the actual process using the GPU. This is the case
for guest VM processes using the GPU via virglrenderer, in which case
the msm native-context renderer in virglrenderer overrides the comm/
cmdline to be the guest process's values.
Exposing this via fdinfo allows tools like gputop to show something more
meaningful than just a bunch of "pcivirtio-gpu" users.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
Documentation/gpu/drm-usage-stats.rst | 8 ++++++++
drivers/gpu/drm/msm/msm_gpu.c | 14 ++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst
index 8e00d53231e0..bc90bed455e3 100644
--- a/Documentation/gpu/drm-usage-stats.rst
+++ b/Documentation/gpu/drm-usage-stats.rst
@@ -148,6 +148,14 @@ percentage utilization of the engine, whereas drm-engine-<keystr> only reflects
time active without considering what frequency the engine is operating as a
percentage of it's maximum frequency.
+- drm-comm: <valstr>
+
+Returns the clients executable path.
+
+- drm-cmdline: <valstr>
+
+Returns the clients cmdline.
+
Implementation Details
======================
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index f0f4f845c32d..1150dcbf28aa 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -148,12 +148,26 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu)
return 0;
}
+static void get_comm_cmdline(struct msm_file_private *ctx, char **comm, char **cmd);
+
void msm_gpu_show_fdinfo(struct msm_gpu *gpu, struct msm_file_private *ctx,
struct drm_printer *p)
{
+ char *comm, *cmdline;
+
+ get_comm_cmdline(ctx, &comm, &cmdline);
+
drm_printf(p, "drm-engine-gpu:\t%llu ns\n", ctx->elapsed_ns);
drm_printf(p, "drm-cycles-gpu:\t%llu\n", ctx->cycles);
drm_printf(p, "drm-maxfreq-gpu:\t%u Hz\n", gpu->fast_rate);
+
+ if (comm)
+ drm_printf(p, "drm-comm:\t%s\n", comm);
+ if (cmdline)
+ drm_printf(p, "drm-cmdline:\t%s\n", cmdline);
+
+ kfree(comm);
+ kfree(cmdline);
}
int msm_gpu_hw_init(struct msm_gpu *gpu)
--
2.39.2
