drm/amdgpu: reroute VMC and UMD to IH ring 1 for oss v5

[Why]
Due Page faults can easily overwhelm the interrupt handler.
So to make sure that we never lose valuable interrupts on the primary ring
we re-route page faults to IH ring 1.
It also facilitates the recovery page process, since it's already
running from a process context.
This is valid for Arcturus and future Navi generation GPUs.

[How]
Setting IH_CLIENT_CFG_DATA for VMC and UMD IH clients.
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/navi10_ih.c

@@ -205,6 +205,24 @@ static uint32_t navi10_ih_doorbell_rptr(struct amdgpu_ih_ring *ih)
 	return ih_doorbell_rtpr;
 }
 
+static void navi10_ih_reroute_ih(struct amdgpu_device *adev)
+{
+	uint32_t tmp;
+
+	/* Reroute to IH ring 1 for VMC */
+	WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_INDEX, 0x12);
+	tmp = RREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA);
+	tmp = REG_SET_FIELD(tmp, IH_CLIENT_CFG_DATA, CLIENT_TYPE, 1);
+	tmp = REG_SET_FIELD(tmp, IH_CLIENT_CFG_DATA, RING_ID, 1);
+	WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA, tmp);
+
+	/* Reroute IH ring 1 for UMC */
+	WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_INDEX, 0x1B);
+	tmp = RREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA);
+	tmp = REG_SET_FIELD(tmp, IH_CLIENT_CFG_DATA, RING_ID, 1);
+	WREG32_SOC15(OSSSYS, 0, mmIH_CLIENT_CFG_DATA, tmp);
+}
+
 /**
  * navi10_ih_irq_init - init and enable the interrupt ring
  *
@@ -243,6 +261,7 @@ static int navi10_ih_irq_init(struct amdgpu_device *adev)
 	} else {
 		WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl);
 	}
+	navi10_ih_reroute_ih(adev);
 
 	if (unlikely(adev->firmware.load_type == AMDGPU_FW_LOAD_DIRECT)) {
 		if (ih->use_bus_addr) {