drm/amdgpu: add RAS fatal error handler for NBIO v7.9

Register RAS fatal error interrupt and add handler.

v2: only register NBIO RAS for dGPU platform.
    change nbio_v7_9_set_ras_controller_irq_state and nbio_v7_9_set_ras_err_event_athub_irq_state
    to dummy functions.
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -35,6 +35,7 @@
 #include "amdgpu_xgmi.h"
 #include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
 #include "nbio_v4_3.h"
+#include "nbio_v7_9.h"
 #include "atom.h"
 #include "amdgpu_reset.h"
 
@@ -2644,6 +2645,10 @@ int amdgpu_ras_init(struct amdgpu_device *adev)
 			 * check DF RAS */
 			adev->nbio.ras = &nbio_v4_3_ras;
 		break;
+	case IP_VERSION(7, 9, 0):
+		if (!adev->gmc.is_app_apu)
+			adev->nbio.ras = &nbio_v7_9_ras;
+		break;
 	default:
 		/* nbio ras is not available */
 		break;

drivers/gpu/drm/amd/amdgpu/nbio_v7_9.c

@@ -471,3 +471,190 @@ const struct amdgpu_nbio_funcs nbio_v7_9_funcs = {
 	.init_registers = nbio_v7_9_init_registers,
 	.get_pcie_replay_count = nbio_v7_9_get_pcie_replay_count,
 };
+
+static void nbio_v7_9_query_ras_error_count(struct amdgpu_device *adev,
+					void *ras_error_status)
+{
+	return;
+}
+
+static void nbio_v7_9_handle_ras_controller_intr_no_bifring(struct amdgpu_device *adev)
+{
+	uint32_t bif_doorbell_intr_cntl;
+	struct ras_manager *obj = amdgpu_ras_find_obj(adev, adev->nbio.ras_if);
+	struct ras_err_data err_data = {0, 0, 0, NULL};
+	struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
+
+	bif_doorbell_intr_cntl = RREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL);
+
+	if (REG_GET_FIELD(bif_doorbell_intr_cntl,
+		BIF_BX0_BIF_DOORBELL_INT_CNTL, RAS_CNTLR_INTERRUPT_STATUS)) {
+		/* driver has to clear the interrupt status when bif ring is disabled */
+		bif_doorbell_intr_cntl = REG_SET_FIELD(bif_doorbell_intr_cntl,
+						BIF_BX0_BIF_DOORBELL_INT_CNTL,
+						RAS_CNTLR_INTERRUPT_CLEAR, 1);
+		WREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL, bif_doorbell_intr_cntl);
+
+		if (!ras->disable_ras_err_cnt_harvest) {
+			/*
+			 * clear error status after ras_controller_intr
+			 * according to hw team and count ue number
+			 * for query
+			 */
+			nbio_v7_9_query_ras_error_count(adev, &err_data);
+
+			/* logging on error cnt and printing for awareness */
+			obj->err_data.ue_count += err_data.ue_count;
+			obj->err_data.ce_count += err_data.ce_count;
+
+			if (err_data.ce_count)
+				dev_info(adev->dev, "%ld correctable hardware "
+						"errors detected in %s block, "
+						"no user action is needed.\n",
+						obj->err_data.ce_count,
+						get_ras_block_str(adev->nbio.ras_if));
+
+			if (err_data.ue_count)
+				dev_info(adev->dev, "%ld uncorrectable hardware "
+						"errors detected in %s block\n",
+						obj->err_data.ue_count,
+						get_ras_block_str(adev->nbio.ras_if));
+		}
+
+		dev_info(adev->dev, "RAS controller interrupt triggered "
+					"by NBIF error\n");
+
+		/* ras_controller_int is dedicated for nbif ras error,
+		 * not the global interrupt for sync flood
+		 */
+		amdgpu_ras_reset_gpu(adev);
+	}
+}
+
+static void nbio_v7_9_handle_ras_err_event_athub_intr_no_bifring(struct amdgpu_device *adev)
+{
+	uint32_t bif_doorbell_intr_cntl;
+
+	bif_doorbell_intr_cntl = RREG32_SOC15(NBIO, 0, regBIF_BX0_BIF_DOORBELL_INT_CNTL);
+
+	if (REG_GET_FIELD(bif_doorbell_intr_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_intr_cntl = REG_SET_FIELD(bif_doorbell_intr_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_intr_cntl);
+
+		amdgpu_ras_global_ras_isr(adev);
+	}
+}
+
+static int nbio_v7_9_set_ras_controller_irq_state(struct amdgpu_device *adev,
+						  struct amdgpu_irq_src *src,
+						  unsigned type,
+						  enum amdgpu_interrupt_state state)
+{
+	/* Dummy function, there is no initialization operation in driver */
+
+	return 0;
+}
+
+static int nbio_v7_9_process_ras_controller_irq(struct amdgpu_device *adev,
+						struct amdgpu_irq_src *source,
+						struct amdgpu_iv_entry *entry)
+{
+	/* By design, the ih cookie for ras_controller_irq should be written
+	 * to BIFring instead of general iv ring. However, due to known bif ring
+	 * hw bug, it has to be disabled. There is no chance the process function
+	 * will be involked. Just left it as a dummy one.
+	 */
+	return 0;
+}
+
+static int nbio_v7_9_set_ras_err_event_athub_irq_state(struct amdgpu_device *adev,
+						       struct amdgpu_irq_src *src,
+						       unsigned type,
+						       enum amdgpu_interrupt_state state)
+{
+	/* Dummy function, there is no initialization operation in driver */
+
+	return 0;
+}
+
+static int nbio_v7_9_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 BIFring instead of general iv ring. However, due to known bif ring
+	 * hw bug, it has to be disabled. There is no chance the process function
+	 * will be involked. Just left it as a dummy one.
+	 */
+	return 0;
+}
+
+static const struct amdgpu_irq_src_funcs nbio_v7_9_ras_controller_irq_funcs = {
+	.set = nbio_v7_9_set_ras_controller_irq_state,
+	.process = nbio_v7_9_process_ras_controller_irq,
+};
+
+static const struct amdgpu_irq_src_funcs nbio_v7_9_ras_err_event_athub_irq_funcs = {
+	.set = nbio_v7_9_set_ras_err_event_athub_irq_state,
+	.process = nbio_v7_9_process_err_event_athub_irq,
+};
+
+static int nbio_v7_9_init_ras_controller_interrupt (struct amdgpu_device *adev)
+{
+	int r;
+
+	/* init the irq funcs */
+	adev->nbio.ras_controller_irq.funcs =
+		&nbio_v7_9_ras_controller_irq_funcs;
+	adev->nbio.ras_controller_irq.num_types = 1;
+
+	/* register ras controller interrupt */
+	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF,
+			      NBIF_7_4__SRCID__RAS_CONTROLLER_INTERRUPT,
+			      &adev->nbio.ras_controller_irq);
+
+	return r;
+}
+
+static int nbio_v7_9_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_v7_9_ras_err_event_athub_irq_funcs;
+	adev->nbio.ras_err_event_athub_irq.num_types = 1;
+
+	/* register ras err event athub interrupt */
+	r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_BIF,
+			      NBIF_7_4__SRCID__ERREVENT_ATHUB_INTERRUPT,
+			      &adev->nbio.ras_err_event_athub_irq);
+
+	return r;
+}
+
+const struct amdgpu_ras_block_hw_ops nbio_v7_9_ras_hw_ops = {
+	.query_ras_error_count = nbio_v7_9_query_ras_error_count,
+};
+
+struct amdgpu_nbio_ras nbio_v7_9_ras = {
+	.ras_block = {
+		.ras_comm = {
+			.name = "pcie_bif",
+			.block = AMDGPU_RAS_BLOCK__PCIE_BIF,
+			.type = AMDGPU_RAS_ERROR__MULTI_UNCORRECTABLE,
+		},
+		.hw_ops = &nbio_v7_9_ras_hw_ops,
+		.ras_late_init = amdgpu_nbio_ras_late_init,
+	},
+	.handle_ras_controller_intr_no_bifring = nbio_v7_9_handle_ras_controller_intr_no_bifring,
+	.handle_ras_err_event_athub_intr_no_bifring = nbio_v7_9_handle_ras_err_event_athub_intr_no_bifring,
+	.init_ras_controller_interrupt = nbio_v7_9_init_ras_controller_interrupt,
+	.init_ras_err_event_athub_interrupt = nbio_v7_9_init_ras_err_event_athub_interrupt,
+};

drivers/gpu/drm/amd/amdgpu/nbio_v7_9.h

@@ -28,5 +28,6 @@
 
 extern const struct nbio_hdp_flush_reg nbio_v7_9_hdp_flush_reg;
 extern const struct amdgpu_nbio_funcs nbio_v7_9_funcs;
+extern struct amdgpu_nbio_ras nbio_v7_9_ras;
 
 #endif