From: Michal Wajdeczko michal.wajdeczko@intel.com
[ Upstream commit 33f17e2cbd930a2a00eb007d9b241b6db010a880 ]
GuC firmware counts received VF configuration KLVs and may start validation of the complete VF config even if some resources where unprovisioned in the meantime, leading to unexpected errors like:
$ echo 1 | sudo tee /sys/kernel/debug/dri/0000:00:02.0/gt0/vf1/contexts_quota $ echo 0 | sudo tee /sys/kernel/debug/dri/0000:00:02.0/gt0/vf1/contexts_quota $ echo 1 | sudo tee /sys/kernel/debug/dri/0000:00:02.0/gt0/vf1/doorbells_quota $ echo 0 | sudo tee /sys/kernel/debug/dri/0000:00:02.0/gt0/vf1/doorbells_quota $ echo 1 | sudo tee /sys/kernel/debug/dri/0000:00:02.0/gt0/vf1/ggtt_quota tee: '/sys/kernel/debug/dri/0000:00:02.0/gt0/vf1/ggtt_quota': Input/output error
To mitigate this problem trigger explicit VF config reset after unprovisioning any of the critical resources (GGTT, context or doorbell IDs) that GuC is monitoring.
Signed-off-by: Michal Wajdeczko michal.wajdeczko@intel.com Reviewed-by: Michał Winiarski michal.winiarski@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20250129195947.764-3-michal.wa... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c | 37 +++++++++++++++++++--- 1 file changed, 33 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c index aaca54b40091f..27f309e3a76e6 100644 --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c @@ -336,6 +336,26 @@ static int pf_push_full_vf_config(struct xe_gt *gt, unsigned int vfid) return err; }
+static int pf_push_vf_cfg(struct xe_gt *gt, unsigned int vfid, bool reset) +{ + int err = 0; + + xe_gt_assert(gt, vfid); + lockdep_assert_held(xe_gt_sriov_pf_master_mutex(gt)); + + if (reset) + err = pf_send_vf_cfg_reset(gt, vfid); + if (!err) + err = pf_push_full_vf_config(gt, vfid); + + return err; +} + +static int pf_refresh_vf_cfg(struct xe_gt *gt, unsigned int vfid) +{ + return pf_push_vf_cfg(gt, vfid, true); +} + static u64 pf_get_ggtt_alignment(struct xe_gt *gt) { struct xe_device *xe = gt_to_xe(gt); @@ -432,6 +452,10 @@ static int pf_provision_vf_ggtt(struct xe_gt *gt, unsigned int vfid, u64 size) return err;
pf_release_vf_config_ggtt(gt, config); + + err = pf_refresh_vf_cfg(gt, vfid); + if (unlikely(err)) + return err; } xe_gt_assert(gt, !xe_ggtt_node_allocated(config->ggtt_region));
@@ -757,6 +781,10 @@ static int pf_provision_vf_ctxs(struct xe_gt *gt, unsigned int vfid, u32 num_ctx return ret;
pf_release_config_ctxs(gt, config); + + ret = pf_refresh_vf_cfg(gt, vfid); + if (unlikely(ret)) + return ret; }
if (!num_ctxs) @@ -1054,6 +1082,10 @@ static int pf_provision_vf_dbs(struct xe_gt *gt, unsigned int vfid, u32 num_dbs) return ret;
pf_release_config_dbs(gt, config); + + ret = pf_refresh_vf_cfg(gt, vfid); + if (unlikely(ret)) + return ret; }
if (!num_dbs) @@ -2085,10 +2117,7 @@ int xe_gt_sriov_pf_config_push(struct xe_gt *gt, unsigned int vfid, bool refresh xe_gt_assert(gt, vfid);
mutex_lock(xe_gt_sriov_pf_master_mutex(gt)); - if (refresh) - err = pf_send_vf_cfg_reset(gt, vfid); - if (!err) - err = pf_push_full_vf_config(gt, vfid); + err = pf_push_vf_cfg(gt, vfid, refresh); mutex_unlock(xe_gt_sriov_pf_master_mutex(gt));
if (unlikely(err)) {