From: Lucas De Marchi lucas.demarchi@intel.com
[ Upstream commit 477d665e9b6a1369968383f50c688d56b692a155 ]
Starting with Xe2 the timestamp is a full 64 bit counter, contrary to the 36 bit that was available before. Although 36 should be sufficient for any reasonable delta calculation (for Xe2, of about 30min), it's surprising to userspace to get something truncated. Also if the timestamp being compared to is coming from the GPU and the application is not careful enough to apply the width there, a delta calculation would be wrong.
Extend it to full 64-bits starting with Xe2.
v2: Expand width=64 to media gt, as it's just a wrong tagging in the spec - empirical tests show it goes beyond 36 bits and match the engines for the main gt
Bspec: 60411 Cc: Szymon Morek szymon.morek@intel.com Reviewed-by: Matt Roper matthew.d.roper@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20241011035618.1057602-1-lucas... Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com (cherry picked from commit 9d559cdcb21f42188d4c3ff3b4fe42b240f4af5d) Signed-off-by: Lucas De Marchi lucas.demarchi@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/xe/xe_query.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xe/xe_query.c b/drivers/gpu/drm/xe/xe_query.c index 4e01df6b1b7a1..3a30b12e22521 100644 --- a/drivers/gpu/drm/xe/xe_query.c +++ b/drivers/gpu/drm/xe/xe_query.c @@ -161,7 +161,11 @@ query_engine_cycles(struct xe_device *xe, cpu_clock);
xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL); - resp.width = 36; + + if (GRAPHICS_VER(xe) >= 20) + resp.width = 64; + else + resp.width = 36;
/* Only write to the output fields of user query */ if (put_user(resp.cpu_timestamp, &query_ptr->cpu_timestamp))