From: Satyanarayana K V P satyanarayana.k.v.p@intel.com
[ 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-satyana... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/xe/xe_gt_sriov_vf.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c index 9c30cbd9af6e1..1c764f200b2a5 100644 --- a/drivers/gpu/drm/xe/xe_gt_sriov_vf.c +++ b/drivers/gpu/drm/xe/xe_gt_sriov_vf.c @@ -47,12 +47,19 @@ 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 = >->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;