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/*
* Copyright 2014 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.
*
* Authors: Ben Skeggs <bskeggs@redhat.com>
*/
#include <nvif/client.h>
#include <nvif/driver.h>
#include <nvif/notify.h>
#include <nvif/object.h>
#include <nvif/ioctl.h>
#include <nvif/event.h>
static inline int
nvif_notify_put_(struct nvif_notify *notify)
{
struct nvif_object *object = notify->object;
struct {
struct nvif_ioctl_v0 ioctl;
struct nvif_ioctl_ntfy_put_v0 ntfy;
} args = {
.ioctl.type = NVIF_IOCTL_V0_NTFY_PUT,
.ntfy.index = notify->index,
};
if (atomic_inc_return(¬ify->putcnt) != 1)
return 0;
return nvif_object_ioctl(object, &args, sizeof(args), NULL);
}
int
nvif_notify_put(struct nvif_notify *notify)
{
if (likely(notify->object) &&
test_and_clear_bit(NVIF_NOTIFY_USER, ¬ify->flags)) {
int ret = nvif_notify_put_(notify);
if (test_bit(NVIF_NOTIFY_WORK, ¬ify->flags))
flush_work(¬ify->work);
return ret;
}
return 0;
}
static inline int
nvif_notify_get_(struct nvif_notify *notify)
{
struct nvif_object *object = notify->object;
struct {
struct nvif_ioctl_v0 ioctl;
struct nvif_ioctl_ntfy_get_v0 ntfy;
} args = {
.ioctl.type = NVIF_IOCTL_V0_NTFY_GET,
.ntfy.index = notify->index,
};
if (atomic_dec_return(¬ify->putcnt) != 0)
return 0;
return nvif_object_ioctl(object, &args, sizeof(args), NULL);
}
int
nvif_notify_get(struct nvif_notify *notify)
{
if (likely(notify->object) &&
!test_and_set_bit(NVIF_NOTIFY_USER, ¬ify->flags))
return nvif_notify_get_(notify);
return 0;
}
static inline int
nvif_notify_func(struct nvif_notify *notify, bool keep)
{
int ret = notify->func(notify);
if (ret == NVIF_NOTIFY_KEEP ||
!test_and_clear_bit(NVIF_NOTIFY_USER, ¬ify->flags)) {
if (!keep)
atomic_dec(¬ify->putcnt);
else
nvif_notify_get_(notify);
}
return ret;
}
static void
nvif_notify_work(struct work_struct *work)
{
struct nvif_notify *notify = container_of(work, typeof(*notify), work);
nvif_notify_func(notify, true);
}
int
nvif_notify(const void *header, u32 length, const void *data, u32 size)
{
struct nvif_notify *notify = NULL;
const union {
struct nvif_notify_rep_v0 v0;
} *args = header;
int ret = NVIF_NOTIFY_DROP;
if (length == sizeof(args->v0) && args->v0.version == 0) {
if (WARN_ON(args->v0.route))
return NVIF_NOTIFY_DROP;
notify = (void *)(unsigned long)args->v0.token;
}
if (!WARN_ON(notify == NULL)) {
struct nvif_client *client = notify->object->client;
if (!WARN_ON(notify->size != size)) {
atomic_inc(¬ify->putcnt);
if (test_bit(NVIF_NOTIFY_WORK, ¬ify->flags)) {
memcpy((void *)notify->data, data, size);
schedule_work(¬ify->work);
return NVIF_NOTIFY_DROP;
}
notify->data = data;
ret = nvif_notify_func(notify, client->driver->keep);
notify->data = NULL;
}
}
return ret;
}
int
nvif_notify_dtor(struct nvif_notify *notify)
{
struct nvif_object *object = notify->object;
struct {
struct nvif_ioctl_v0 ioctl;
struct nvif_ioctl_ntfy_del_v0 ntfy;
} args = {
.ioctl.type = NVIF_IOCTL_V0_NTFY_DEL,
.ntfy.index = notify->index,
};
int ret = nvif_notify_put(notify);
if (ret >= 0 && object) {
ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
notify->object = NULL;
kfree((void *)notify->data);
}
return ret;
}
int
nvif_notify_ctor(struct nvif_object *object, const char *name,
int (*func)(struct nvif_notify *), bool work, u8 event,
void *data, u32 size, u32 reply, struct nvif_notify *notify)
{
struct {
struct nvif_ioctl_v0 ioctl;
struct nvif_ioctl_ntfy_new_v0 ntfy;
struct nvif_notify_req_v0 req;
} *args;
int ret = -ENOMEM;
notify->object = object;
notify->name = name ? name : "nvifNotify";
notify->flags = 0;
atomic_set(¬ify->putcnt, 1);
notify->func = func;
notify->data = NULL;
notify->size = reply;
if (work) {
INIT_WORK(¬ify->work, nvif_notify_work);
set_bit(NVIF_NOTIFY_WORK, ¬ify->flags);
notify->data = kmalloc(notify->size, GFP_KERNEL);
if (!notify->data)
goto done;
}
if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL)))
goto done;
args->ioctl.version = 0;
args->ioctl.type = NVIF_IOCTL_V0_NTFY_NEW;
args->ntfy.version = 0;
args->ntfy.event = event;
args->req.version = 0;
args->req.reply = notify->size;
args->req.route = 0;
args->req.token = (unsigned long)(void *)notify;
memcpy(args->req.data, data, size);
ret = nvif_object_ioctl(object, args, sizeof(*args) + size, NULL);
notify->index = args->ntfy.index;
kfree(args);
done:
if (ret)
nvif_notify_dtor(notify);
return ret;
}
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