tmakin/ack-tegra
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/xe/vf: Retry sending MMIO request to GUC on timeout error

Browse Source 
[ Upstream commit ba757a65d2a28d46a8ccf50538f4f05036983f1b ]

Add support to allow retrying the sending of MMIO requests
from the VF to the GUC in the event of an error. During the
suspend/resume process, VFs begin resuming only after the PF has
resumed. Although the PF resumes, the GUC reset and provisioning
occur later in a separate worker process.

When there are a large number of VFs, some may attempt to resume
before the PF has completed its provisioning. Therefore, if a
MMIO request from a VF fails during this period, we will retry
sending the request up to GUC_RESET_VF_STATE_RETRY_MAX times,
which is set to a maximum of 10 attempts.

Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Cc: Michał Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Piotr Piorkowski <piotr.piorkowski@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250224102807.11065-3-satyanarayana.k.v.p@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Satyanarayana K V P
2025-02-24 15:58:07 +05:30
committed by Greg Kroah-Hartman
parent 3a3efeef64
commit df888ad55f
1 changed files with 8 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/xe/xe_gt_sriov_vf.c
View File

@@ -46,12 +46,19 @@ static int guc_action_vf_reset(struct xe_guc *guc)
return ret > 0 ? -EPROTO : ret;
}
#define GUC_RESET_VF_STATE_RETRY_MAX 10
static int vf_reset_guc_state(struct xe_gt *gt)
{
unsigned int retry = GUC_RESET_VF_STATE_RETRY_MAX;
struct xe_guc *guc = &gt->uc.guc;
int err;
err = guc_action_vf_reset(guc);
do {
err = guc_action_vf_reset(guc);
if (!err || err != -ETIMEDOUT)
break;
} while (--retry);
if (unlikely(err))
xe_gt_sriov_err(gt, "Failed to reset GuC state (%pe)\n", ERR_PTR(err));
return err;