drm/amdgpu: Support nbif v6_3_1 fatal error handling

Add nbif v6_3_1 fatal error handling support.

Signed-off-by: Candice Li <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 #include "amdgpu_xgmi.h"
 #include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
 #include "nbio_v4_3.h"
+#include "nbif_v6_3_1.h"
 #include "nbio_v7_9.h"
 #include "atom.h"
 #include "amdgpu_reset.h"
···
 			 * enable nbio ras in such case. Instead,
 			 * check DF RAS */
 			adev->nbio.ras = &nbio_v4_3_ras;
+		break;
+	case IP_VERSION(6, 3, 1):
+		if (adev->ras_hw_enabled & (1 << AMDGPU_RAS_BLOCK__DF))
+			/* unlike other generation of nbio ras,
+			 * nbif v6_3_1 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 = &nbif_v6_3_1_ras;
 		break;
 	case IP_VERSION(7, 9, 0):
 	case IP_VERSION(7, 9, 1):

drivers/gpu/drm/amd/amdgpu/nbif_v6_3_1.c

···
 #include "nbif/nbif_6_3_1_sh_mask.h"
 #include "pcie/pcie_6_1_0_offset.h"
 #include "pcie/pcie_6_1_0_sh_mask.h"
+#include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
 #include <uapi/linux/kfd_ioctl.h>
 
 static void nbif_v6_3_1_remap_hdp_registers(struct amdgpu_device *adev)
···
 	.remap_hdp_registers = nbif_v6_3_1_remap_hdp_registers,
 	.get_rom_offset = nbif_v6_3_1_get_rom_offset,
 	.set_reg_remap = nbif_v6_3_1_set_reg_remap,
+};
+
+static int nbif_v6_3_1_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 nbif_v6_3_1_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 nbif_v6_3_1_ras_err_event_athub_irq_funcs = {
+	.set = nbif_v6_3_1_set_ras_err_event_athub_irq_state,
+	.process = nbif_v6_3_1_process_err_event_athub_irq,
+};
+
+static void nbif_v6_3_1_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_BX0_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_BX0_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 nbif_v6_3_1_init_ras_err_event_athub_interrupt(struct amdgpu_device *adev)
+{
+	int r;
+
+	/* init the irq funcs */
+	adev->nbio.ras_err_event_athub_irq.funcs =
+		&nbif_v6_3_1_ras_err_event_athub_irq_funcs;
+	adev->nbio.ras_err_event_athub_irq.num_types = 1;
+
+	/* register ras err event athub interrupt
+	 * nbif v6_3_1 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 nbif_v6_3_1_ras = {
+	.handle_ras_err_event_athub_intr_no_bifring =
+		nbif_v6_3_1_handle_ras_err_event_athub_intr_no_bifring,
+	.init_ras_err_event_athub_interrupt =
+		nbif_v6_3_1_init_ras_err_event_athub_interrupt,
 };

drivers/gpu/drm/amd/amdgpu/nbif_v6_3_1.h

···
 extern const struct nbio_hdp_flush_reg nbif_v6_3_1_hdp_flush_reg;
 extern const struct amdgpu_nbio_funcs nbif_v6_3_1_funcs;
 extern const struct amdgpu_nbio_funcs nbif_v6_3_1_sriov_funcs;
+extern struct amdgpu_nbio_ras nbif_v6_3_1_ras;
 
 #endif

drivers/gpu/drm/amd/amdgpu/soc24.c

···
 {
 	struct amdgpu_device *adev = ip_block->adev;
 
-	if (amdgpu_sriov_vf(adev))
+	if (amdgpu_sriov_vf(adev)) {
 		xgpu_nv_mailbox_get_irq(adev);
+	} 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
+			 * nbif v6_3_1 only support fatal error hanlding
+			 * just enable the interrupt directly
+			 */
+			amdgpu_irq_get(adev, &adev->nbio.ras_err_event_athub_irq, 0);
+	}
 
 	/* Enable selfring doorbell aperture late because doorbell BAR
 	 * aperture will change if resize BAR successfully in gmc sw_init.
···
 	adev->nbio.funcs->enable_doorbell_aperture(adev, false);
 	adev->nbio.funcs->enable_doorbell_selfring_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;
 }