/*
* 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 "nouveau_drm.h"
#include "nouveau_usif.h"
#include <nvif/notify.h>
#include <nvif/unpack.h>
#include <nvif/client.h>
#include <nvif/event.h>
#include <nvif/ioctl.h>
struct usif_notify_p {
struct drm_pending_event base;
struct {
struct drm_event base;
u8 data[];
} e;
};
struct usif_notify {
struct list_head head;
atomic_t enabled;
u32 handle;
u16 reply;
u8 route;
u64 token;
struct usif_notify_p *p;
};
static inline struct usif_notify *
usif_notify_find(struct drm_file *filp, u32 handle)
{
struct nouveau_cli *cli = nouveau_cli(filp);
struct usif_notify *ntfy;
list_for_each_entry(ntfy, &cli->notifys, head) {
if (ntfy->handle == handle)
return ntfy;
}
return NULL;
}
static inline void
usif_notify_dtor(struct usif_notify *ntfy)
{
list_del(&ntfy->head);
kfree(ntfy);
}
int
usif_notify(const void *header, u32 length, const void *data, u32 size)
{
struct usif_notify *ntfy = NULL;
const union {
struct nvif_notify_rep_v0 v0;
} *rep = header;
struct drm_device *dev;
struct drm_file *filp;
unsigned long flags;
if (length == sizeof(rep->v0) && rep->v0.version == 0) {
if (WARN_ON(!(ntfy = (void *)(unsigned long)rep->v0.token)))
return NVIF_NOTIFY_DROP;
BUG_ON(rep->v0.route != NVDRM_NOTIFY_USIF);
} else
if (WARN_ON(1))
return NVIF_NOTIFY_DROP;
if (WARN_ON(!ntfy->p || ntfy->reply != (length + size)))
return NVIF_NOTIFY_DROP;
filp = ntfy->p->base.file_priv;
dev = filp->minor->dev;
memcpy(&ntfy->p->e.data[0], header, length);
memcpy(&ntfy->p->e.data[length], data, size);
switch (rep->v0.version) {
case 0: {
struct nvif_notify_rep_v0 *rep = (void *)ntfy->p->e.data;
rep->route = ntfy->route;
rep->token = ntfy->token;
}
break;
default:
BUG_ON(1);
break;
}
spin_lock_irqsave(&dev->event_lock, flags);
if (!WARN_ON(filp->event_space < ntfy->p->e.base.length)) {
list_add_tail(&ntfy->p->base.link, &filp->event_list);
filp->event_space -= ntfy->p->e.base.length;
}
wake_up_interruptible(&filp->event_wait);
spin_unlock_irqrestore(&dev->event_lock, flags);
atomic_set(&ntfy->enabled, 0);
return NVIF_NOTIFY_DROP;
}
static int
usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
{
struct nouveau_cli *cli = nouveau_cli(f);
struct nvif_client *client = &cli->base;
union {
struct nvif_ioctl_ntfy_new_v0 v0;
} *args = data;
union {
struct nvif_notify_req_v0 v0;
} *req;
struct usif_notify *ntfy;
int ret;
if (nvif_unpack(args->v0, 0, 0, true)) {
if (usif_notify_find(f, args->v0.index))
return -EEXIST;
} else
return ret;
req = data;
if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL)))
return -ENOMEM;
atomic_set(&ntfy->enabled, 0);
if (nvif_unpack(req->v0, 0, 0, true)) {
ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply;
ntfy->route = req->v0.route;
ntfy->token = req->v0.token;
req->v0.route = NVDRM_NOTIFY_USIF;
req->v0.token = (unsigned long)(void *)ntfy;
ret = nvif_client_ioctl(client, argv, argc);
req->v0.token = ntfy->token;
req->v0.route = ntfy->route;
ntfy->handle = args->v0.index;
}
if (ret == 0)
list_add(&ntfy->head, &cli->notifys);
if (ret)
kfree(ntfy);
return ret;
}
static int
usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
{
struct nouveau_cli *cli = nouveau_cli(f);
struct nvif_client *client = &cli->base;
union {
struct nvif_ioctl_ntfy_del_v0 v0;
} *args = data;
struct usif_notify *ntfy;
int ret;
if (nvif_unpack(args->v0, 0, 0, true)) {
if (!(ntfy = usif_notify_find(f, args->v0.index)))
return -ENOENT;
} else
return ret;
ret = nvif_client_ioctl(client, argv, argc);
if (ret == 0)
usif_notify_dtor(ntfy);
return ret;
}
static int
usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
{
struct nouveau_cli *cli = nouveau_cli(f);
struct nvif_client *client = &cli->base;
union {
struct nvif_ioctl_ntfy_del_v0 v0;
} *args = data;
struct usif_notify *ntfy;
int ret;
if (nvif_unpack(args->v0, 0, 0, true)) {
if (!(ntfy = usif_notify_find(f, args->v0.index)))
return -ENOENT;
} else
return ret;
if (atomic_xchg(&ntfy->enabled, 1))
return 0;
ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL);
if (ret = -ENOMEM, !ntfy->p)
goto done;
ntfy->p->base.event = &ntfy->p->e.base;
ntfy->p->base.file_priv = f;
ntfy->p->base.pid = current->pid;
ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree;
ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF;
ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply;
ret = nvif_client_ioctl(client, argv, argc);
done:
if (ret) {
atomic_set(&ntfy->enabled, 0);
kfree(ntfy->p);
}
return ret;
}
static int
usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
{
struct nouveau_cli *cli = nouveau_cli(f);
struct nvif_client *client = &cli->base;
union {
struct nvif_ioctl_ntfy_put_v0 v0;
} *args = data;
struct usif_notify *ntfy;
int ret;
if (nvif_unpack(args->v0, 0, 0, true)) {
if (!(ntfy = usif_notify_find(f, args->v0.index)))
return -ENOENT;
} else
return ret;
ret = nvif_client_ioctl(client, argv, argc);
if (ret == 0 && atomic_xchg(&ntfy->enabled, 0))
kfree(ntfy->p);
return ret;
}
struct usif_object {
struct list_head head;
struct list_head ntfy;
u8 route;
u64 token;
};
static void
usif_object_dtor(struct usif_object *object)
{
list_del(&object->head);
kfree(object);
}
static int
usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
{
struct nouveau_cli *cli = nouveau_cli(f);
struct nvif_client *client = &cli->base;
union {
struct nvif_ioctl_new_v0 v0;
} *args = data;
struct usif_object *object;
int ret;
if (!(object = kmalloc(sizeof(*object), GFP_KERNEL)))
return -ENOMEM;
list_add(&object->head, &cli->objects);
if (nvif_unpack(args->v0, 0, 0, true)) {
object->route = args->v0.route;
object->token = args->v0.token;
args->v0.route = NVDRM_OBJECT_USIF;
args->v0.token = (unsigned long)(void *)object;
ret = nvif_client_ioctl(client, argv, argc);
args->v0.token = object->token;
args->v0.route = object->route;
}
if (ret)
usif_object_dtor(object);
return ret;
}
int
usif_ioctl(struct drm_file *filp, void __user *user, u32 argc)
{
struct nouveau_cli *cli = nouveau_cli(filp);
struct nvif_client *client = &cli->base;
void *data = kmalloc(argc, GFP_KERNEL);
u32 size = argc;
union {
struct nvif_ioctl_v0 v0;
} *argv = data;
struct usif_object *object;
u8 owner;
int ret;
if (ret = -ENOMEM, !argv)
goto done;
if (ret = -EFAULT, copy_from_user(argv, user, size))
goto done;
if (nvif_unpack(argv->v0, 0, 0, true)) {
/* block access to objects not created via this interface */
owner = argv->v0.owner;
argv->v0.owner = NVDRM_OBJECT_USIF;
} else
goto done;
mutex_lock(&cli->mutex);
switch (argv->v0.type) {
case NVIF_IOCTL_V0_NEW:
/* ... except if we're creating children */
argv->v0.owner = NVIF_IOCTL_V0_OWNER_ANY;
ret = usif_object_new(filp, data, size, argv, argc);
break;
case NVIF_IOCTL_V0_NTFY_NEW:
ret = usif_notify_new(filp, data, size, argv, argc);
break;
case NVIF_IOCTL_V0_NTFY_DEL:
ret = usif_notify_del(filp, data, size, argv, argc);
break;
case NVIF_IOCTL_V0_NTFY_GET:
ret = usif_notify_get(filp, data, size, argv, argc);
break;
case NVIF_IOCTL_V0_NTFY_PUT:
ret = usif_notify_put(filp, data, size, argv, argc);
break;
default:
ret = nvif_client_ioctl(client, argv, argc);
break;
}
if (argv->v0.route == NVDRM_OBJECT_USIF) {
object = (void *)(unsigned long)argv->v0.token;
argv->v0.route = object->route;
argv->v0.token = object->token;
if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) {
list_del(&object->head);
kfree(object);
}
} else {
argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN;
argv->v0.token = 0;
}
argv->v0.owner = owner;
mutex_unlock(&cli->mutex);
if (copy_to_user(user, argv, argc))
ret = -EFAULT;
done:
kfree(argv);
return ret;
}
void
usif_client_fini(struct nouveau_cli *cli)
{
struct usif_object *object, *otemp;
struct usif_notify *notify, *ntemp;
list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) {
usif_notify_dtor(notify);
}
list_for_each_entry_safe(object, otemp, &cli->objects, head) {
usif_object_dtor(object);
}
}
void
usif_client_init(struct nouveau_cli *cli)
{
INIT_LIST_HEAD(&cli->objects);
INIT_LIST_HEAD(&cli->notifys);
}
