drm/amdgpu: Add fatal error handling in nbio v4_3

GPU will stop working once fatal error is detected.
it will inform driver to do reset to recover from
the fatal error.

v2: squash in logic fix (Srinivasan)
v3: squash in logic fix (Dan)
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Candice Li <candice.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -34,6 +34,7 @@
 #include "amdgpu_atomfirmware.h"
 #include "amdgpu_xgmi.h"
 #include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
+#include "nbio_v4_3.h"
 #include "atom.h"
 #include "amdgpu_reset.h"
 
@@ -2562,6 +2563,16 @@ int amdgpu_ras_init(struct amdgpu_device *adev)
 		if (!adev->gmc.xgmi.connected_to_cpu)
 			adev->nbio.ras = &nbio_v7_4_ras;
 		break;
+	case IP_VERSION(4, 3, 0):
+		if (adev->ras_hw_enabled & (1 << AMDGPU_RAS_BLOCK__DF))
+			/* unlike other generation of nbio ras,
+			 * nbio v4_3 only support fatal error interrupt
+			 * to inform software that DF is freezed due to
+			 * system fatal error event. driver should not
+			 * enable nbio ras in such case. Instead,
+			 * check DF RAS */
+			adev->nbio.ras = &nbio_v4_3_ras;
+		break;
 	default:
 		/* nbio ras is not available */
 		break;

drivers/gpu/drm/amd/amdgpu/nbio_v4_3.c

@@ -26,6 +26,7 @@
 
 #include "nbio/nbio_4_3_0_offset.h"
 #include "nbio/nbio_4_3_0_sh_mask.h"
+#include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
 #include <uapi/linux/kfd_ioctl.h>
 
 static void nbio_v4_3_remap_hdp_registers(struct amdgpu_device *adev)
@@ -538,3 +539,81 @@ const struct amdgpu_nbio_funcs nbio_v4_3_sriov_funcs = {
 	.remap_hdp_registers = nbio_v4_3_remap_hdp_registers,
 	.get_rom_offset = nbio_v4_3_get_rom_offset,
 };
+
+static int nbio_v4_3_set_ras_err_event_athub_irq_state(struct amdgpu_device *adev,
+						       struct amdgpu_irq_src *src,
+						       unsigned type,
+						       enum amdgpu_interrupt_state state)
+{
+	/* The ras_controller_irq enablement should be done in psp bl when it
+	 * tries to enable ras feature. Driver only need to set the correct interrupt
+	 * vector for bare-metal and sriov use case respectively
+	 */
+	uint32_t bif_doorbell_int_cntl;
+
+	bif_doorbell_int_cntl = RREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL);
+	bif_doorbell_int_cntl = REG_SET_FIELD(bif_doorbell_int_cntl,
+					      BIF_BX0_BIF_DOORBELL_INT_CNTL,
+					      RAS_ATHUB_ERR_EVENT_INTERRUPT_DISABLE,
+					      (state == AMDGPU_IRQ_STATE_ENABLE) ? 0 : 1);
+	WREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL, bif_doorbell_int_cntl);
+
+	return 0;
+}
+
+static int nbio_v4_3_process_err_event_athub_irq(struct amdgpu_device *adev,
+						 struct amdgpu_irq_src *source,
+						 struct amdgpu_iv_entry *entry)
+{
+	/* By design, the ih cookie for err_event_athub_irq should be written
+	 * to bif ring. since bif ring is not enabled, just leave process callback
+	 * as a dummy one.
+	 */
+	return 0;
+}
+
+static const struct amdgpu_irq_src_funcs nbio_v4_3_ras_err_event_athub_irq_funcs = {
+	.set = nbio_v4_3_set_ras_err_event_athub_irq_state,
+	.process = nbio_v4_3_process_err_event_athub_irq,
+};
+
+static void nbio_v4_3_handle_ras_err_event_athub_intr_no_bifring(struct amdgpu_device *adev)
+{
+	uint32_t bif_doorbell_int_cntl;
+
+	bif_doorbell_int_cntl = RREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL);
+	if (REG_GET_FIELD(bif_doorbell_int_cntl,
+			  BIF_DOORBELL_INT_CNTL,
+			  RAS_ATHUB_ERR_EVENT_INTERRUPT_STATUS)) {
+		/* driver has to clear the interrupt status when bif ring is disabled */
+		bif_doorbell_int_cntl = REG_SET_FIELD(bif_doorbell_int_cntl,
+						BIF_DOORBELL_INT_CNTL,
+						RAS_ATHUB_ERR_EVENT_INTERRUPT_CLEAR, 1);
+		WREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL, bif_doorbell_int_cntl);
+		amdgpu_ras_global_ras_isr(adev);
+	}
+}
+
+static int nbio_v4_3_init_ras_err_event_athub_interrupt(struct amdgpu_device *adev)
+{
+
+	int r;
+
+	/* init the irq funcs */
+	adev->nbio.ras_err_event_athub_irq.funcs =
+		&nbio_v4_3_ras_err_event_athub_irq_funcs;
+	adev->nbio.ras_err_event_athub_irq.num_types = 1;
+
+	/* register ras err event athub interrupt
+	 * nbio v4_3 uses the same irq source as nbio v7_4 */
+	r = amdgpu_irq_add_id(adev, SOC21_IH_CLIENTID_BIF,
+			      NBIF_7_4__SRCID__ERREVENT_ATHUB_INTERRUPT,
+			      &adev->nbio.ras_err_event_athub_irq);
+
+	return r;
+}
+
+struct amdgpu_nbio_ras nbio_v4_3_ras = {
+	.handle_ras_err_event_athub_intr_no_bifring = nbio_v4_3_handle_ras_err_event_athub_intr_no_bifring,
+	.init_ras_err_event_athub_interrupt = nbio_v4_3_init_ras_err_event_athub_interrupt,
+};

drivers/gpu/drm/amd/amdgpu/nbio_v4_3.h

@@ -29,5 +29,6 @@
 extern const struct nbio_hdp_flush_reg nbio_v4_3_hdp_flush_reg;
 extern const struct amdgpu_nbio_funcs nbio_v4_3_funcs;
 extern const struct amdgpu_nbio_funcs nbio_v4_3_sriov_funcs;
+extern struct amdgpu_nbio_ras nbio_v4_3_ras;
 
 #endif

drivers/gpu/drm/amd/amdgpu/soc21.c

@@ -754,6 +754,14 @@ static int soc21_common_late_init(void *handle)
 							     sriov_vcn_4_0_0_video_codecs_decode_array_vcn0,
 							     ARRAY_SIZE(sriov_vcn_4_0_0_video_codecs_decode_array_vcn0));
 		}
+	} else {
+		if (adev->nbio.ras &&
+		    adev->nbio.ras_err_event_athub_irq.funcs)
+			/* don't need to fail gpu late init
+			 * if enabling athub_err_event interrupt failed
+			 * nbio v4_3 only support fatal error hanlding
+			 * just enable the interrupt directly */
+			amdgpu_irq_get(adev, &adev->nbio.ras_err_event_athub_irq, 0);
 	}
 
 	return 0;
@@ -801,8 +809,13 @@ static int soc21_common_hw_fini(void *handle)
 	/* disable the doorbell aperture */
 	soc21_enable_doorbell_aperture(adev, false);
 
-	if (amdgpu_sriov_vf(adev))
+	if (amdgpu_sriov_vf(adev)) {
 		xgpu_nv_mailbox_put_irq(adev);
+	} else {
+		if (adev->nbio.ras &&
+		    adev->nbio.ras_err_event_athub_irq.funcs)
+			amdgpu_irq_put(adev, &adev->nbio.ras_err_event_athub_irq, 0);
+	}
 
 	return 0;
 }