/*
 * 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>

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.intr(fault->buffer[index], false);
}

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.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,
};

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_fault_buffer *buffer;
        int ret;

        if (!(buffer = kzalloc(sizeof(*buffer), GFP_KERNEL)))
                return -ENOMEM;
        buffer->fault = fault;
        buffer->id = id;
        fault->func->buffer.info(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;

        /* Pin fault buffer in BAR2. */
        buffer->addr = nvkm_memory_bar2(buffer->mem);
        if (buffer->addr == ~0ULL)
                return -EFAULT;

        return 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;
                }
        }

        ret = nvkm_event_init(&nvkm_fault_ntfy, 1, fault->buffer_nr,
                              &fault->event);
        if (ret)
                return ret;

        if (fault->func->oneinit)
                ret = fault->func->oneinit(fault);
        return ret;
}

static void *
nvkm_fault_dtor(struct nvkm_subdev *subdev)
{
        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_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;
}