ice: Add helper function for clearing VPGEN_VFRTRIG

Create a helper function for clearing VPGEN_VFRTRIG as this needs to be
done on reset to notify the VF that we are done resetting it. Also, it
needs to be done on SR-IOV initialization/creation in case it was left
in a bad state after SR-IOV tear down.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
index b699ca8..039f0b0 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl_pf.c
@@ -962,6 +962,21 @@ static int ice_set_per_vf_res(struct ice_pf *pf)
 }
 
 /**
+ * ice_clear_vf_reset_trigger - enable VF to access hardware
+ * @vf: VF to enabled hardware access for
+ */
+static void ice_clear_vf_reset_trigger(struct ice_vf *vf)
+{
+       struct ice_hw *hw = &vf->pf->hw;
+       u32 reg;
+
+       reg = rd32(hw, VPGEN_VFRTRIG(vf->vf_id));
+       reg &= ~VPGEN_VFRTRIG_VFSWR_M;
+       wr32(hw, VPGEN_VFRTRIG(vf->vf_id), reg);
+       ice_flush(hw);
+}
+
+/**
  * ice_cleanup_and_realloc_vf - Clean up VF and reallocate resources after reset
  * @vf: pointer to the VF structure
  *
@@ -974,26 +989,20 @@ static void ice_cleanup_and_realloc_vf(struct ice_vf *vf)
 {
        struct ice_pf *pf = vf->pf;
        struct ice_hw *hw;
-       u32 reg;
 
        hw = &pf->hw;
 
-       /* PF software completes the flow by notifying VF that reset flow is
-        * completed. This is done by enabling hardware by clearing the reset
-        * bit in the VPGEN_VFRTRIG reg and setting VFR_STATE in the VFGEN_RSTAT
-        * register to VFR completed (done at the end of this function)
-        * By doing this we allow HW to access VF memory at any point. If we
-        * did it any sooner, HW could access memory while it was being freed
-        * in ice_free_vf_res(), causing an IOMMU fault.
+       /* Allow HW to access VF memory after calling
+        * ice_clear_vf_reset_trigger(). If we did it any sooner, HW could
+        * access memory while it was being freed in ice_free_vf_res(), causing
+        * an IOMMU fault.
         *
         * On the other hand, this needs to be done ASAP, because the VF driver
         * is waiting for this to happen and may report a timeout. It's
         * harmless, but it gets logged into Guest OS kernel log, so best avoid
         * it.
         */
-       reg = rd32(hw, VPGEN_VFRTRIG(vf->vf_id));
-       reg &= ~VPGEN_VFRTRIG_VFSWR_M;
-       wr32(hw, VPGEN_VFRTRIG(vf->vf_id), reg);
+       ice_clear_vf_reset_trigger(vf);
 
        /* reallocate VF resources to finish resetting the VSI state */
        if (!ice_alloc_vf_res(vf)) {