[PATCH v3 0/1] Add support for EU stall sampling

[Ranjan, Joshua Santhosh]

+ @Kumar, Shubham

-----Original Message-----
From: Chegondi, Harish <harish.chegondi at intel.com> 
Sent: Monday, September 9, 2024 1:07 PM
To: intel-xe at lists.freedesktop.org
Cc: Dixit, Ashutosh <ashutosh.dixit at intel.com>; Ausmus, James <james.ausmus at intel.com>; Degrood, Felix J <felix.j.degrood at intel.com>; Souza, Jose <jose.souza at intel.com>; Cabral, Matias A <matias.a.cabral at intel.com>; Ranjan, Joshua Santhosh <joshua.santosh.ranjan at intel.com>; Chegondi, Harish <harish.chegondi at intel.com>
Subject: [PATCH v3 0/1] Add support for EU stall sampling

The following patch adds support for EU stall sampling, a new hardware feature first added in PVC and is being supported in XE2 and later architecture GPUs. This feature would enable capturing of EU stall data which include the IP address of the instruction stalled and various stall reason counts. More details are explained in the patch commit message.

Support for this feature is being added into Mesa.
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30142

A new test in the IGT repo: 
https://gitlab.freedesktop.org/drm/igt-gpu-tools.git
is also under development to test this feature in the driver. This patch has undergone basic testing with the new IGT test that is under development.

Thank You.

v3: a. Removed data header and changed read() to return -EIO when data is dropped by the HW.
    b. Added a new DRM_XE_OBSERVATION_IOCTL_INFO to query EU stall data record info
    c. Added struct drm_xe_eu_stall_data_pvc and struct drm_xe_eu_stall_data_xe2
       to xe_drm.h. These declarations would help user space to parse the
       EU stall data
    d. Addressed other review comments from v2
v2: Rename xe perf layer as xe observation layer (Ashutosh)

Harish Chegondi (1):
  drm/xe/eustall: Add support for EU stall sampling

 drivers/gpu/drm/xe/Makefile                |    1 +
 drivers/gpu/drm/xe/regs/xe_eu_stall_regs.h |   33 +
 drivers/gpu/drm/xe/xe_eustall_cntr.c       | 1000 ++++++++++++++++++++
 drivers/gpu/drm/xe/xe_eustall_cntr.h       |   60 ++
 drivers/gpu/drm/xe/xe_gt.c                 |    6 +
 drivers/gpu/drm/xe/xe_gt_topology.c        |    9 +
 drivers/gpu/drm/xe/xe_gt_topology.h        |    3 +
 drivers/gpu/drm/xe/xe_gt_types.h           |    3 +
 drivers/gpu/drm/xe/xe_observation.c        |   14 +
 drivers/gpu/drm/xe/xe_trace.h              |   35 +
 include/uapi/drm/xe_drm.h                  |  134 +++
 11 files changed, 1298 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/regs/xe_eu_stall_regs.h
 create mode 100644 drivers/gpu/drm/xe/xe_eustall_cntr.c
 create mode 100644 drivers/gpu/drm/xe/xe_eustall_cntr.h

--
2.45.1