drm/nouveau/fault/tu102: switch to explicit intr handlers

- reads vectors from HW, rather than being hardcoded
- removes hacks to support routing via old interfaces
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/fault.h

@@ -7,6 +7,8 @@ struct nvkm_fault {
 	const struct nvkm_fault_func *func;
 	struct nvkm_subdev subdev;
 
+	struct nvkm_inth info_fault;
+
 	struct nvkm_fault_buffer *buffer[2];
 	int buffer_nr;
 

drivers/gpu/drm/nouveau/nvkm/subdev/fault/priv.h

@@ -16,6 +16,8 @@ struct nvkm_fault_buffer {
 	u32 put;
 	struct nvkm_memory *mem;
 	u64 addr;
+
+	struct nvkm_inth inth;
 };
 
 int nvkm_fault_new_(const struct nvkm_fault_func *, struct nvkm_device *, enum nvkm_subdev_type,

drivers/gpu/drm/nouveau/nvkm/subdev/fault/tu102.c

@@ -24,20 +24,27 @@
 #include <core/memory.h>
 #include <subdev/mc.h>
 #include <subdev/mmu.h>
+#include <subdev/vfn.h>
 #include <engine/fifo.h>
 
 #include <nvif/class.h>
 
+static irqreturn_t
+tu102_fault_buffer_notify(struct nvkm_inth *inth)
+{
+	struct nvkm_fault_buffer *buffer = container_of(inth, typeof(*buffer), inth);
+
+	nvkm_event_ntfy(&buffer->fault->event, buffer->id, NVKM_FAULT_BUFFER_EVENT_PENDING);
+	return IRQ_HANDLED;
+}
+
 static void
 tu102_fault_buffer_intr(struct nvkm_fault_buffer *buffer, bool enable)
 {
-	/*XXX: Earlier versions of RM touched the old regs on Turing,
-	 *     which don't appear to actually work anymore, but newer
-	 *     versions of RM don't appear to touch anything at all..
-	 */
-	struct nvkm_device *device = buffer->fault->subdev.device;
-
-	nvkm_mc_intr_mask(device, NVKM_SUBDEV_FAULT, 0, enable);
+	if (enable)
+		nvkm_inth_allow(&buffer->inth);
+	else
+		nvkm_inth_block(&buffer->inth);
 }
 
 static void
@@ -46,10 +53,6 @@ tu102_fault_buffer_fini(struct nvkm_fault_buffer *buffer)
 	struct nvkm_device *device = buffer->fault->subdev.device;
 	const u32 foff = buffer->id * 0x20;
 
-	/* Disable the fault interrupts */
-	nvkm_wr32(device, 0xb81408, 0x1);
-	nvkm_wr32(device, 0xb81410, 0x10);
-
 	nvkm_mask(device, 0xb83010 + foff, 0x80000000, 0x00000000);
 }
 
@@ -59,10 +62,6 @@ tu102_fault_buffer_init(struct nvkm_fault_buffer *buffer)
 	struct nvkm_device *device = buffer->fault->subdev.device;
 	const u32 foff = buffer->id * 0x20;
 
-	/* Enable the fault interrupts */
-	nvkm_wr32(device, 0xb81208, 0x1);
-	nvkm_wr32(device, 0xb81210, 0x10);
-
 	nvkm_mask(device, 0xb83010 + foff, 0xc0000000, 0x40000000);
 	nvkm_wr32(device, 0xb83004 + foff, upper_32_bits(buffer->addr));
 	nvkm_wr32(device, 0xb83000 + foff, lower_32_bits(buffer->addr));
@@ -82,9 +81,10 @@ tu102_fault_buffer_info(struct nvkm_fault_buffer *buffer)
 	buffer->put = 0xb8300c + foff;
 }
 
-static void
-tu102_fault_intr_fault(struct nvkm_fault *fault)
+static irqreturn_t
+tu102_fault_info_fault(struct nvkm_inth *inth)
 {
+	struct nvkm_fault *fault = container_of(inth, typeof(*fault), info_fault);
 	struct nvkm_subdev *subdev = &fault->subdev;
 	struct nvkm_device *device = subdev->device;
 	struct nvkm_fault_data info;
@@ -106,45 +106,9 @@ tu102_fault_intr_fault(struct nvkm_fault *fault)
 	info.reason = (info1 & 0x0000001f);
 
 	nvkm_fifo_fault(device->fifo, &info);
-}
-
-static void
-tu102_fault_intr(struct nvkm_fault *fault)
-{
-	struct nvkm_subdev *subdev = &fault->subdev;
-	struct nvkm_device *device = subdev->device;
-	u32 stat = nvkm_rd32(device, 0xb83094);
 
-	if (stat & 0x80000000) {
-		tu102_fault_intr_fault(fault);
 	nvkm_wr32(device, 0xb83094, 0x80000000);
-		stat &= ~0x80000000;
-	}
-
-	if (stat & 0x00000200) {
-		/* Clear the associated interrupt flag */
-		nvkm_wr32(device, 0xb81010, 0x10);
-
-		if (fault->buffer[0]) {
-			nvkm_event_ntfy(&fault->event, 0, NVKM_FAULT_BUFFER_EVENT_PENDING);
-			stat &= ~0x00000200;
-		}
-	}
-
-	/* Replayable MMU fault */
-	if (stat & 0x00000100) {
-		/* Clear the associated interrupt flag */
-		nvkm_wr32(device, 0xb81008, 0x1);
-
-		if (fault->buffer[1]) {
-			nvkm_event_ntfy(&fault->event, 1, NVKM_FAULT_BUFFER_EVENT_PENDING);
-			stat &= ~0x00000100;
-		}
-	}
-
-	if (stat) {
-		nvkm_debug(subdev, "intr %08x\n", stat);
-	}
+	return IRQ_HANDLED;
 }
 
 static void
@@ -155,23 +119,48 @@ tu102_fault_fini(struct nvkm_fault *fault)
 
 	if (fault->buffer[0])
 		fault->func->buffer.fini(fault->buffer[0]);
-	/*XXX: disable priv faults */
+
+	nvkm_inth_block(&fault->info_fault);
 }
 
 static void
 tu102_fault_init(struct nvkm_fault *fault)
 {
-	/*XXX: enable priv faults */
+	nvkm_inth_allow(&fault->info_fault);
+
 	fault->func->buffer.init(fault->buffer[0]);
 	nvkm_event_ntfy_allow(&fault->nrpfb);
 }
 
+static int
+tu102_fault_oneinit(struct nvkm_fault *fault)
+{
+	struct nvkm_device *device = fault->subdev.device;
+	struct nvkm_intr *intr = &device->vfn->intr;
+	int ret, i;
+
+	ret = nvkm_inth_add(intr, nvkm_rd32(device, 0x100ee0) & 0x0000ffff,
+			    NVKM_INTR_PRIO_NORMAL, &fault->subdev, tu102_fault_info_fault,
+			    &fault->info_fault);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < fault->buffer_nr; i++) {
+		ret = nvkm_inth_add(intr, nvkm_rd32(device, 0x100ee4 + (i * 4)) >> 16,
+				    NVKM_INTR_PRIO_NORMAL, &fault->subdev,
+				    tu102_fault_buffer_notify, &fault->buffer[i]->inth);
+		if (ret)
+			return ret;
+	}
+
+	return gv100_fault_oneinit(fault);
+}
+
 static const struct nvkm_fault_func
 tu102_fault = {
-	.oneinit = gv100_fault_oneinit,
+	.oneinit = tu102_fault_oneinit,
 	.init = tu102_fault_init,
 	.fini = tu102_fault_fini,
-	.intr = tu102_fault_intr,
 	.buffer.nr = 2,
 	.buffer.entry_size = 32,
 	.buffer.info = tu102_fault_buffer_info,

drivers/gpu/drm/nouveau/nvkm/subdev/mc/tu102.c

@@ -39,11 +39,6 @@ tu102_mc_intr_update(struct tu102_mc *mc)
 		nvkm_wr32(device, 0x000180 + (i * 0x04), ~mask);
 		nvkm_wr32(device, 0x000160 + (i * 0x04),  mask);
 	}
-
-	if (mask & 0x00000200)
-		nvkm_wr32(device, 0xb81608, 0x6);
-	else
-		nvkm_wr32(device, 0xb81610, 0x6);
 }
 
 static void
@@ -88,14 +83,6 @@ tu102_mc_intr_stat(struct nvkm_mc *mc)
 	struct nvkm_device *device = mc->subdev.device;
 	u32 intr0 = nvkm_rd32(device, 0x000100);
 	u32 intr1 = nvkm_rd32(device, 0x000104);
-	u32 intr_top = nvkm_rd32(device, 0xb81600);
-
-	/* Turing and above route the MMU fault interrupts via a different
-	 * interrupt tree with different control registers. For the moment remap
-	 * them back to the old PMC vector.
-	 */
-	if (intr_top & 0x00000006)
-		intr0 |= 0x00000200;
 
 	return intr0 | intr1;
 }