drm/nouveau/fault: expose replayable fault buffer event class

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drivers/gpu/drm/nouveau/include/nvif/clb069.h

@@ -8,5 +8,8 @@ struct nvif_clb069_v0 {
 	__u32 put;
 };
 
-#define NVB069_V0_NTFY_FAULT                                                0x00
+union nvif_clb069_event_args {
+	struct nvif_clb069_event_vn {
+	} vn;
+};
 #endif

drivers/gpu/drm/nouveau/nouveau_svm.c

@@ -24,7 +24,7 @@
 #include "nouveau_chan.h"
 #include "nouveau_dmem.h"
 
-#include <nvif/notify.h>
+#include <nvif/event.h>
 #include <nvif/object.h>
 #include <nvif/vmm.h>
 
@@ -51,7 +51,8 @@ struct nouveau_svm {
 		u32 putaddr;
 		u32 get;
 		u32 put;
-		struct nvif_notify notify;
+		struct nvif_event notify;
+		struct work_struct work;
 
 		struct nouveau_svm_fault {
 			u64 inst;
@@ -711,13 +712,11 @@ static int nouveau_range_fault(struct nouveau_svmm *svmm,
 	return ret;
 }
 
-static int
-nouveau_svm_fault(struct nvif_notify *notify)
+static void
+nouveau_svm_fault(struct work_struct *work)
 {
-	struct nouveau_svm_fault_buffer *buffer =
-		container_of(notify, typeof(*buffer), notify);
-	struct nouveau_svm *svm =
-		container_of(buffer, typeof(*svm), buffer[buffer->id]);
+	struct nouveau_svm_fault_buffer *buffer = container_of(work, typeof(*buffer), work);
+	struct nouveau_svm *svm = container_of(buffer, typeof(*svm), buffer[buffer->id]);
 	struct nvif_object *device = &svm->drm->client.device.object;
 	struct nouveau_svmm *svmm;
 	struct {
@@ -737,7 +736,7 @@ nouveau_svm_fault(struct nvif_notify *notify)
 		buffer->put = nvif_rd32(device, buffer->putaddr);
 		buffer->get = nvif_rd32(device, buffer->getaddr);
 		if (buffer->get == buffer->put)
-			return NVIF_NOTIFY_KEEP;
+			return;
 	}
 	buffer->fault_nr = 0;
 
@@ -881,7 +880,15 @@ nouveau_svm_fault(struct nvif_notify *notify)
 	/* Issue fault replay to the GPU. */
 	if (replay)
 		nouveau_svm_fault_replay(svm);
-	return NVIF_NOTIFY_KEEP;
+}
+
+static int
+nouveau_svm_event(struct nvif_event *event, void *argv, u32 argc)
+{
+	struct nouveau_svm_fault_buffer *buffer = container_of(event, typeof(*buffer), notify);
+
+	schedule_work(&buffer->work);
+	return NVIF_EVENT_KEEP;
 }
 
 static struct nouveau_pfnmap_args *
@@ -936,7 +943,9 @@ static void
 nouveau_svm_fault_buffer_fini(struct nouveau_svm *svm, int id)
 {
 	struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id];
-	nvif_notify_put(&buffer->notify);
+
+	nvif_event_block(&buffer->notify);
+	flush_work(&buffer->work);
 }
 
 static int
@@ -944,10 +953,12 @@ nouveau_svm_fault_buffer_init(struct nouveau_svm *svm, int id)
 {
 	struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id];
 	struct nvif_object *device = &svm->drm->client.device.object;
+
 	buffer->get = nvif_rd32(device, buffer->getaddr);
 	buffer->put = nvif_rd32(device, buffer->putaddr);
 	SVM_DBG(svm, "get %08x put %08x (init)", buffer->get, buffer->put);
-	return nvif_notify_get(&buffer->notify);
+
+	return nvif_event_allow(&buffer->notify);
 }
 
 static void
@@ -956,15 +967,18 @@ nouveau_svm_fault_buffer_dtor(struct nouveau_svm *svm, int id)
 	struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id];
 	int i;
 
+	if (!nvif_object_constructed(&buffer->object))
+		return;
+
+	nouveau_svm_fault_buffer_fini(svm, id);
+
 	if (buffer->fault) {
 		for (i = 0; buffer->fault[i] && i < buffer->entries; i++)
 			kfree(buffer->fault[i]);
 		kvfree(buffer->fault);
 	}
 
-	nouveau_svm_fault_buffer_fini(svm, id);
-
-	nvif_notify_dtor(&buffer->notify);
+	nvif_event_dtor(&buffer->notify);
 	nvif_object_dtor(&buffer->object);
 }
 
@@ -990,10 +1004,10 @@ nouveau_svm_fault_buffer_ctor(struct nouveau_svm *svm, s32 oclass, int id)
 	buffer->entries = args.entries;
 	buffer->getaddr = args.get;
 	buffer->putaddr = args.put;
+	INIT_WORK(&buffer->work, nouveau_svm_fault);
 
-	ret = nvif_notify_ctor(&buffer->object, "svmFault", nouveau_svm_fault,
-			       true, NVB069_V0_NTFY_FAULT, NULL, 0, 0,
-			       &buffer->notify);
+	ret = nvif_event_ctor(&buffer->object, "svmFault", id, nouveau_svm_event, true, NULL, 0,
+			      &buffer->notify);
 	if (ret)
 		return ret;
 

drivers/gpu/drm/nouveau/nvkm/subdev/fault/base.c

@@ -22,7 +22,6 @@
 #include "priv.h"
 
 #include <core/memory.h>
-#include <core/notify.h>
 
 static void
 nvkm_fault_ntfy_fini(struct nvkm_event *event, int type, int index)
@@ -38,23 +37,8 @@ nvkm_fault_ntfy_init(struct nvkm_event *event, int type, int index)
 	fault->func->buffer.intr(fault->buffer[index], true);
 }
 
-static int
-nvkm_fault_ntfy_ctor(struct nvkm_object *object, void *argv, u32 argc,
-		     struct nvkm_notify *notify)
-{
-	struct nvkm_fault_buffer *buffer = nvkm_fault_buffer(object);
-	if (argc == 0) {
-		notify->size  = 0;
-		notify->types = 1;
-		notify->index = buffer->id;
-		return 0;
-	}
-	return -ENOSYS;
-}
-
 static const struct nvkm_event_func
 nvkm_fault_ntfy = {
-	.ctor = nvkm_fault_ntfy_ctor,
 	.init = nvkm_fault_ntfy_init,
 	.fini = nvkm_fault_ntfy_fini,
 };

drivers/gpu/drm/nouveau/nvkm/subdev/fault/user.c

@@ -22,11 +22,27 @@
 #include "priv.h"
 
 #include <core/memory.h>
+#include <core/event.h>
 #include <subdev/mmu.h>
 
 #include <nvif/clb069.h>
 #include <nvif/unpack.h>
 
+static int
+nvkm_ufault_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_uevent *uevent)
+{
+	struct nvkm_fault_buffer *buffer = nvkm_fault_buffer(object);
+	union nvif_clb069_event_args *args = argv;
+
+	if (!uevent)
+		return 0;
+	if (argc != sizeof(args->vn))
+		return -ENOSYS;
+
+	return nvkm_uevent_add(uevent, &buffer->fault->event, buffer->id,
+			       NVKM_FAULT_BUFFER_EVENT_PENDING, NULL);
+}
+
 static int
 nvkm_ufault_map(struct nvkm_object *object, void *argv, u32 argc,
 		enum nvkm_object_map *type, u64 *addr, u64 *size)
@@ -39,18 +55,6 @@ nvkm_ufault_map(struct nvkm_object *object, void *argv, u32 argc,
 	return 0;
 }
 
-static int
-nvkm_ufault_ntfy(struct nvkm_object *object, u32 type,
-		 struct nvkm_event **pevent)
-{
-	struct nvkm_fault_buffer *buffer = nvkm_fault_buffer(object);
-	if (type == NVB069_V0_NTFY_FAULT) {
-		*pevent = &buffer->fault->event;
-		return 0;
-	}
-	return -EINVAL;
-}
-
 static int
 nvkm_ufault_fini(struct nvkm_object *object, bool suspend)
 {
@@ -78,8 +82,8 @@ nvkm_ufault = {
 	.dtor = nvkm_ufault_dtor,
 	.init = nvkm_ufault_init,
 	.fini = nvkm_ufault_fini,
-	.ntfy = nvkm_ufault_ntfy,
 	.map = nvkm_ufault_map,
+	.uevent = nvkm_ufault_uevent,
 };
 
 int