drm/nouveau/fault: add infrastructure to support fault buffers

#include <core/subdev.h>

struct nvkm_fault {

	const struct nvkm_fault_func *func;

	struct nvkm_subdev subdev;

	struct nvkm_fault_buffer *buffer[1];

	int buffer_nr;

	struct nvkm_event event;

};

#endif

nvkm-y += nvkm/subdev/fault/base.o

/*

 * Copyright 2018 Red Hat Inc.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR

 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 */

#include "priv.h"

#include <core/memory.h>

#include <core/notify.h>

#include <subdev/bar.h>

#include <subdev/mmu.h>

static void

nvkm_fault_ntfy_fini(struct nvkm_event *event, int type, int index)

{

	struct nvkm_fault *fault = container_of(event, typeof(*fault), event);

	fault->func->buffer.fini(fault->buffer[index]);

}

static void

nvkm_fault_ntfy_init(struct nvkm_event *event, int type, int index)

{

	struct nvkm_fault *fault = container_of(event, typeof(*fault), event);

	fault->func->buffer.init(fault->buffer[index]);

}

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,

};

static void

nvkm_fault_intr(struct nvkm_subdev *subdev)

{

	struct nvkm_fault *fault = nvkm_fault(subdev);

	return fault->func->intr(fault);

}

static int

nvkm_fault_fini(struct nvkm_subdev *subdev, bool suspend)

{

	struct nvkm_fault *fault = nvkm_fault(subdev);

	if (fault->func->fini)

		fault->func->fini(fault);

	return 0;

}

static int

nvkm_fault_init(struct nvkm_subdev *subdev)

{

	struct nvkm_fault *fault = nvkm_fault(subdev);

	if (fault->func->init)

		fault->func->init(fault);

	return 0;

}

static int

nvkm_fault_oneinit_buffer(struct nvkm_fault *fault, int id)

{

	struct nvkm_subdev *subdev = &fault->subdev;

	struct nvkm_device *device = subdev->device;

	struct nvkm_vmm *bar2 = nvkm_bar_bar2_vmm(device);

	struct nvkm_fault_buffer *buffer;

	int ret;

	if (!(buffer = kzalloc(sizeof(*buffer), GFP_KERNEL)))

		return -ENOMEM;

	buffer->fault = fault;

	buffer->id = id;

	buffer->entries = fault->func->buffer.entries(buffer);

	fault->buffer[id] = buffer;

	nvkm_debug(subdev, "buffer %d: %d entries\n", id, buffer->entries);

	ret = nvkm_memory_new(device, NVKM_MEM_TARGET_INST, buffer->entries *

			      fault->func->buffer.entry_size, 0x1000, true,

			      &buffer->mem);

	if (ret)

		return ret;

	ret = nvkm_vmm_get(bar2, 12, nvkm_memory_size(buffer->mem),

			   &buffer->vma);

	if (ret)

		return ret;

	return nvkm_memory_map(buffer->mem, 0, bar2, buffer->vma, NULL, 0);

}

static int

nvkm_fault_oneinit(struct nvkm_subdev *subdev)

{

	struct nvkm_fault *fault = nvkm_fault(subdev);

	int ret, i;

	for (i = 0; i < ARRAY_SIZE(fault->buffer); i++) {

		if (i < fault->func->buffer.nr) {

			ret = nvkm_fault_oneinit_buffer(fault, i);

			if (ret)

				return ret;

			fault->buffer_nr = i + 1;

		}

	}

	return nvkm_event_init(&nvkm_fault_ntfy, 1, fault->buffer_nr,

			       &fault->event);

}

static void *

nvkm_fault_dtor(struct nvkm_subdev *subdev)

{

	struct nvkm_vmm *bar2 = nvkm_bar_bar2_vmm(subdev->device);

	struct nvkm_fault *fault = nvkm_fault(subdev);

	int i;

	nvkm_event_fini(&fault->event);

	for (i = 0; i < fault->buffer_nr; i++) {

		if (fault->buffer[i]) {

			nvkm_vmm_put(bar2, &fault->buffer[i]->vma);

			nvkm_memory_unref(&fault->buffer[i]->mem);

			kfree(fault->buffer[i]);

		}

	}

	return fault;

}

static const struct nvkm_subdev_func

nvkm_fault = {

	.dtor = nvkm_fault_dtor,

	.oneinit = nvkm_fault_oneinit,

	.init = nvkm_fault_init,

	.fini = nvkm_fault_fini,

	.intr = nvkm_fault_intr,

};

int

nvkm_fault_new_(const struct nvkm_fault_func *func, struct nvkm_device *device,

		int index, struct nvkm_fault **pfault)

{

	struct nvkm_fault *fault;

	if (!(fault = *pfault = kzalloc(sizeof(*fault), GFP_KERNEL)))

		return -ENOMEM;

	nvkm_subdev_ctor(&nvkm_fault, device, index, &fault->subdev);

	fault->func = func;

	return 0;

}

#ifndef __NVKM_FAULT_PRIV_H__

#define __NVKM_FAULT_PRIV_H__

#define nvkm_fault_buffer(p) container_of((p), struct nvkm_fault_buffer, object)

#define nvkm_fault(p) container_of((p), struct nvkm_fault, subdev)

#include <subdev/fault.h>

#include <core/event.h>

#include <core/object.h>

struct nvkm_fault_buffer {

	struct nvkm_object object;

	struct nvkm_fault *fault;

	int id;

	int entries;

	struct nvkm_memory *mem;

	struct nvkm_vma *vma;

};

int nvkm_fault_new_(const struct nvkm_fault_func *, struct nvkm_device *,

		    int index, struct nvkm_fault **);

struct nvkm_fault_func {

	void (*init)(struct nvkm_fault *);

	void (*fini)(struct nvkm_fault *);

	void (*intr)(struct nvkm_fault *);

	struct {

		int nr;

		u32 entry_size;

		u32 (*entries)(struct nvkm_fault_buffer *);

		void (*init)(struct nvkm_fault_buffer *);

		void (*fini)(struct nvkm_fault_buffer *);

	} buffer;

};

#endif