drm/amdkfd: Handle VM faults in KFD

1. Pre-GFX9 the amdgpu ISR saves the vm-fault status and address per
   per-vmid. amdkfd needs to get the information from amdgpu through the
   new get_vm_fault_info interface. On GFX9 and later, all the required
   information is in the IH ring
2. amdkfd unmaps all queues from the faulting process and create new
   run-list without the guilty process
3. amdkfd notifies the runtime of the vm fault trap via EVENT_TYPE_MEMORY

Signed-off-by: shaoyun liu <shaoyun.liu@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c

@@ -48,18 +48,19 @@ static bool cik_event_interrupt_isr(struct kfd_dev *dev,
 	return ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE ||
 		ihre->source_id == CIK_INTSRC_SDMA_TRAP ||
 		ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG ||
-		ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE;
+		ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE ||
+		ihre->source_id == CIK_INTSRC_GFX_PAGE_INV_FAULT ||
+		ihre->source_id == CIK_INTSRC_GFX_MEM_PROT_FAULT;
 }
 
 static void cik_event_interrupt_wq(struct kfd_dev *dev,
 					const uint32_t *ih_ring_entry)
 {
-	unsigned int pasid;
 	const struct cik_ih_ring_entry *ihre =
 			(const struct cik_ih_ring_entry *)ih_ring_entry;
 	uint32_t context_id = ihre->data & 0xfffffff;
-
-	pasid = (ihre->ring_id & 0xffff0000) >> 16;
+	unsigned int vmid  = (ihre->ring_id & 0x0000ff00) >> 8;
+	unsigned int pasid = (ihre->ring_id & 0xffff0000) >> 16;
 
 	if (pasid == 0)
 		return;
@@ -72,6 +73,22 @@ static void cik_event_interrupt_wq(struct kfd_dev *dev,
 		kfd_signal_event_interrupt(pasid, context_id & 0xff, 8);
 	else if (ihre->source_id == CIK_INTSRC_CP_BAD_OPCODE)
 		kfd_signal_hw_exception_event(pasid);
+	else if (ihre->source_id == CIK_INTSRC_GFX_PAGE_INV_FAULT ||
+		ihre->source_id == CIK_INTSRC_GFX_MEM_PROT_FAULT) {
+		struct kfd_vm_fault_info info;
+
+		kfd_process_vm_fault(dev->dqm, pasid);
+
+		memset(&info, 0, sizeof(info));
+		dev->kfd2kgd->get_vm_fault_info(dev->kgd, &info);
+		if (!info.page_addr && !info.status)
+			return;
+
+		if (info.vmid == vmid)
+			kfd_signal_vm_fault_event(dev, pasid, &info);
+		else
+			kfd_signal_vm_fault_event(dev, pasid, NULL);
+	}
 }
 
 const struct kfd_event_interrupt_class event_interrupt_class_cik = {

drivers/gpu/drm/amd/amdkfd/cik_int.h

@@ -37,6 +37,8 @@ struct cik_ih_ring_entry {
 #define CIK_INTSRC_DEQUEUE_COMPLETE	0xC6
 #define CIK_INTSRC_SDMA_TRAP		0xE0
 #define CIK_INTSRC_SQ_INTERRUPT_MSG	0xEF
+#define CIK_INTSRC_GFX_PAGE_INV_FAULT	0x92
+#define CIK_INTSRC_GFX_MEM_PROT_FAULT	0x93
 
 #endif
 

drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c

@@ -1684,6 +1684,23 @@ void device_queue_manager_uninit(struct device_queue_manager *dqm)
 	kfree(dqm);
 }
 
+int kfd_process_vm_fault(struct device_queue_manager *dqm,
+			 unsigned int pasid)
+{
+	struct kfd_process_device *pdd;
+	struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
+	int ret = 0;
+
+	if (!p)
+		return -EINVAL;
+	pdd = kfd_get_process_device_data(dqm->dev, p);
+	if (pdd)
+		ret = dqm->ops.evict_process_queues(dqm, &pdd->qpd);
+	kfd_unref_process(p);
+
+	return ret;
+}
+
 #if defined(CONFIG_DEBUG_FS)
 
 static void seq_reg_dump(struct seq_file *m,

drivers/gpu/drm/amd/amdkfd/kfd_events.c

@@ -963,3 +963,40 @@ void kfd_signal_hw_exception_event(unsigned int pasid)
 	mutex_unlock(&p->event_mutex);
 	kfd_unref_process(p);
 }
+
+void kfd_signal_vm_fault_event(struct kfd_dev *dev, unsigned int pasid,
+				struct kfd_vm_fault_info *info)
+{
+	struct kfd_event *ev;
+	uint32_t id;
+	struct kfd_process *p = kfd_lookup_process_by_pasid(pasid);
+	struct kfd_hsa_memory_exception_data memory_exception_data;
+
+	if (!p)
+		return; /* Presumably process exited. */
+	memset(&memory_exception_data, 0, sizeof(memory_exception_data));
+	memory_exception_data.gpu_id = dev->id;
+	memory_exception_data.failure.imprecise = 1;
+	/* Set failure reason */
+	if (info) {
+		memory_exception_data.va = (info->page_addr) << PAGE_SHIFT;
+		memory_exception_data.failure.NotPresent =
+			info->prot_valid ? 1 : 0;
+		memory_exception_data.failure.NoExecute =
+			info->prot_exec ? 1 : 0;
+		memory_exception_data.failure.ReadOnly =
+			info->prot_write ? 1 : 0;
+		memory_exception_data.failure.imprecise = 0;
+	}
+	mutex_lock(&p->event_mutex);
+
+	id = KFD_FIRST_NONSIGNAL_EVENT_ID;
+	idr_for_each_entry_continue(&p->event_idr, ev, id)
+		if (ev->type == KFD_EVENT_TYPE_MEMORY) {
+			ev->memory_exception_data = memory_exception_data;
+			set_event(ev);
+		}
+
+	mutex_unlock(&p->event_mutex);
+	kfd_unref_process(p);
+}

drivers/gpu/drm/amd/amdkfd/kfd_int_process_v9.c

@@ -57,7 +57,9 @@ static bool event_interrupt_isr_v9(struct kfd_dev *dev,
 	return source_id == SOC15_INTSRC_CP_END_OF_PIPE ||
 		source_id == SOC15_INTSRC_SDMA_TRAP ||
 		source_id == SOC15_INTSRC_SQ_INTERRUPT_MSG ||
-		source_id == SOC15_INTSRC_CP_BAD_OPCODE;
+		source_id == SOC15_INTSRC_CP_BAD_OPCODE ||
+		client_id == SOC15_IH_CLIENTID_VMC ||
+		client_id == SOC15_IH_CLIENTID_UTCL2;
 }
 
 static void event_interrupt_wq_v9(struct kfd_dev *dev,
@@ -82,7 +84,19 @@ static void event_interrupt_wq_v9(struct kfd_dev *dev,
 		kfd_signal_hw_exception_event(pasid);
 	else if (client_id == SOC15_IH_CLIENTID_VMC ||
 		 client_id == SOC15_IH_CLIENTID_UTCL2) {
-		/* TODO */
+		struct kfd_vm_fault_info info = {0};
+		uint16_t ring_id = SOC15_RING_ID_FROM_IH_ENTRY(ih_ring_entry);
+
+		info.vmid = vmid;
+		info.mc_id = client_id;
+		info.page_addr = ih_ring_entry[4] |
+			(uint64_t)(ih_ring_entry[5] & 0xf) << 32;
+		info.prot_valid = ring_id & 0x08;
+		info.prot_read  = ring_id & 0x10;
+		info.prot_write = ring_id & 0x20;
+
+		kfd_process_vm_fault(dev->dqm, pasid);
+		kfd_signal_vm_fault_event(dev, pasid, &info);
 	}
 }
 

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

@@ -838,6 +838,7 @@ void device_queue_manager_uninit(struct device_queue_manager *dqm);
 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 					enum kfd_queue_type type);
 void kernel_queue_uninit(struct kernel_queue *kq);
+int kfd_process_vm_fault(struct device_queue_manager *dqm, unsigned int pasid);
 
 /* Process Queue Manager */
 struct process_queue_node {
@@ -964,6 +965,9 @@ int kfd_event_create(struct file *devkfd, struct kfd_process *p,
 		     uint64_t *event_page_offset, uint32_t *event_slot_index);
 int kfd_event_destroy(struct kfd_process *p, uint32_t event_id);
 
+void kfd_signal_vm_fault_event(struct kfd_dev *dev, unsigned int pasid,
+				struct kfd_vm_fault_info *info);
+
 void kfd_flush_tlb(struct kfd_process_device *pdd);
 
 int dbgdev_wave_reset_wavefronts(struct kfd_dev *dev, struct kfd_process *p);

include/uapi/linux/kfd_ioctl.h

@@ -219,7 +219,7 @@ struct kfd_memory_exception_failure {
 	__u32 NotPresent;	/* Page not present or supervisor privilege */
 	__u32 ReadOnly;	/* Write access to a read-only page */
 	__u32 NoExecute;	/* Execute access to a page marked NX */
-	__u32 pad;
+	__u32 imprecise;	/* Can't determine the	exact fault address */
 };
 
 /* memory exception data*/