drm/amdgpu: Rearm IRQ in Navi10 SR-IOV if IRQ lost

[Dhume, Samir]

[AMD Official Use Only - Internal Distribution Only]

Ported from Vega10. SDMA stress tests sometimes see IRQ lost.

Signed-off-by: Samir Dhume <samir.dh...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/navi10_ih.c | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/navi10_ih.c 
b/drivers/gpu/drm/amd/amdgpu/navi10_ih.c
index cf557a428298..e08245a446fc 100644
--- a/drivers/gpu/drm/amd/amdgpu/navi10_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/navi10_ih.c
@@ -32,6 +32,7 @@
 #include "soc15_common.h"
 #include "navi10_ih.h"
 
+#define MAX_REARM_RETRY 10
 
 static void navi10_ih_set_interrupt_funcs(struct amdgpu_device *adev);
 
@@ -283,6 +284,38 @@ static void navi10_ih_decode_iv(struct amdgpu_device *adev,
        ih->rptr += 32;
 }
 
+/**
+ * navi10_ih_irq_rearm - rearm IRQ if lost
+ *
+ * @adev: amdgpu_device pointer
+ *
+ */
+static void navi10_ih_irq_rearm(struct amdgpu_device *adev,
+                              struct amdgpu_ih_ring *ih)
+{
+       uint32_t reg_rptr = 0;
+       uint32_t v = 0;
+       uint32_t i = 0;
+
+       if (ih == &adev->irq.ih)
+               reg_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_RPTR);
+       else if (ih == &adev->irq.ih1)
+               reg_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_RPTR_RING1);
+       else if (ih == &adev->irq.ih2)
+               reg_rptr = SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_RPTR_RING2);
+       else
+               return;
+
+       /* Rearm IRQ / re-write doorbell if doorbell write is lost */
+       for (i = 0; i < MAX_REARM_RETRY; i++) {
+               v = RREG32_NO_KIQ(reg_rptr);
+               if ((v < ih->ring_size) && (v != ih->rptr))
+                       WDOORBELL32(ih->doorbell_index, ih->rptr);
+               else
+                       break;
+       }
+}
+
 /**
  * navi10_ih_set_rptr - set the IH ring buffer rptr
  *
@@ -297,6 +330,9 @@ static void navi10_ih_set_rptr(struct amdgpu_device *adev,
                /* XXX check if swapping is necessary on BE */
                *ih->rptr_cpu = ih->rptr;
                WDOORBELL32(ih->doorbell_index, ih->rptr);
+
+               if (amdgpu_sriov_vf(adev))
+                       navi10_ih_irq_rearm(adev, ih);
        } else
                WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, ih->rptr);  }
--
2.20.1
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