/**
* Inserts the given magic number into the hash table of used magic number
* lists.
*/
static int drm_add_magic(struct drm_device *dev, struct drm_file *priv,
drm_magic_t magic)
{
int hash;
drm_magic_entry_t *entry;
DRM_DEBUG("%d\n", magic);
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
hash = drm_hash_magic(magic);
entry = malloc(sizeof(*entry), DRM_MEM_MAGIC, M_ZERO | M_NOWAIT);
if (!entry)
return ENOMEM;
entry->magic = magic;
entry->priv = priv;
entry->next = NULL;
if (dev->magiclist[hash].tail) {
dev->magiclist[hash].tail->next = entry;
dev->magiclist[hash].tail = entry;
} else {
dev->magiclist[hash].head = entry;
dev->magiclist[hash].tail = entry;
}
return 0;
}
/**
* Adds a magic number.
*
* \param dev DRM device.
* \param priv file private data.
* \param magic magic number.
*
* Creates a drm_magic_entry structure and appends to the linked list
* associated the magic number hash key in drm_device::magiclist, while holding
* the drm_device::struct_sem lock.
*/
static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
{
int hash;
drm_magic_entry_t *entry;
DRM_DEBUG("%d\n", magic);
hash = drm_hash_magic(magic);
entry = drm_alloc(sizeof(*entry), DRM_MEM_MAGIC);
if (!entry) return -ENOMEM;
memset(entry, 0, sizeof(*entry));
entry->magic = magic;
entry->priv = priv;
entry->next = NULL;
down(&dev->struct_sem);
if (dev->magiclist[hash].tail) {
dev->magiclist[hash].tail->next = entry;
dev->magiclist[hash].tail = entry;
} else {
dev->magiclist[hash].head = entry;
dev->magiclist[hash].tail = entry;
}
up(&dev->struct_sem);
return 0;
}
/**
* Remove a magic number.
*
* \param dev DRM device.
* \param magic magic number.
*
* Searches and unlinks the entry in drm_device::magiclist with the magic
* number hash key, while holding the drm_device::struct_sem lock.
*/
static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
{
drm_magic_entry_t *prev = NULL;
drm_magic_entry_t *pt;
int hash;
DRM_DEBUG("%d\n", magic);
hash = drm_hash_magic(magic);
down(&dev->struct_sem);
for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
if (pt->magic == magic) {
if (dev->magiclist[hash].head == pt) {
dev->magiclist[hash].head = pt->next;
}
if (dev->magiclist[hash].tail == pt) {
dev->magiclist[hash].tail = prev;
}
if (prev) {
prev->next = pt->next;
}
up(&dev->struct_sem);
return 0;
}
}
up(&dev->struct_sem);
drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
return -EINVAL;
}
/**
* Removes the given magic number from the hash table of used magic number
* lists.
*/
static int drm_remove_magic(struct drm_device *dev, drm_magic_t magic)
{
drm_magic_entry_t *prev = NULL;
drm_magic_entry_t *pt;
int hash;
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
DRM_DEBUG("%d\n", magic);
hash = drm_hash_magic(magic);
for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
if (pt->magic == magic) {
if (dev->magiclist[hash].head == pt) {
dev->magiclist[hash].head = pt->next;
}
if (dev->magiclist[hash].tail == pt) {
dev->magiclist[hash].tail = prev;
}
if (prev) {
prev->next = pt->next;
}
free(pt, DRM_MEM_MAGIC);
return 0;
}
}
return EINVAL;
}
static int drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
{
drm_magic_entry_t *prev = NULL;
drm_magic_entry_t *pt;
int hash;
DRM_DEBUG("%d\n", magic);
hash = drm_hash_magic(magic);
DRM_LOCK();
for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
if (pt->magic == magic) {
if (dev->magiclist[hash].head == pt) {
dev->magiclist[hash].head = pt->next;
}
if (dev->magiclist[hash].tail == pt) {
dev->magiclist[hash].tail = prev;
}
if (prev) {
prev->next = pt->next;
}
DRM_UNLOCK();
return 0;
}
}
DRM_UNLOCK();
free(pt, M_DRM);
return DRM_ERR(EINVAL);
}
static int drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
{
int hash;
drm_magic_entry_t *entry;
DRM_DEBUG("%d\n", magic);
hash = drm_hash_magic(magic);
entry = malloc(sizeof(*entry), M_DRM, M_ZERO | M_NOWAIT);
if (!entry) return DRM_ERR(ENOMEM);
entry->magic = magic;
entry->priv = priv;
entry->next = NULL;
DRM_LOCK();
if (dev->magiclist[hash].tail) {
dev->magiclist[hash].tail->next = entry;
dev->magiclist[hash].tail = entry;
} else {
dev->magiclist[hash].head = entry;
dev->magiclist[hash].tail = entry;
}
DRM_UNLOCK();
return 0;
}
int
drm_remove_magic(drm_device_t *dev, drm_magic_t magic)
{
drm_magic_entry_t *prev = NULL;
drm_magic_entry_t *pt;
int hash;
DRM_DEBUG("drm_remove_magic : %d", magic);
hash = drm_hash_magic(magic);
DRM_LOCK();
for (pt = dev->magiclist[hash].head; pt; prev = pt, pt = pt->next) {
if (pt->magic == magic) {
if (dev->magiclist[hash].head == pt) {
dev->magiclist[hash].head = pt->next;
}
if (dev->magiclist[hash].tail == pt) {
dev->magiclist[hash].tail = prev;
}
if (prev) {
prev->next = pt->next;
}
DRM_UNLOCK();
drm_free(pt, sizeof (*pt), DRM_MEM_MAGIC);
return (0);
}
}
DRM_UNLOCK();
return (EINVAL);
}
static int
drm_add_magic(drm_device_t *dev, drm_file_t *priv, drm_magic_t magic)
{
int hash;
drm_magic_entry_t *entry;
hash = drm_hash_magic(magic);
entry = drm_alloc(sizeof (*entry), DRM_MEM_MAGIC);
if (!entry)
return (ENOMEM);
entry->magic = magic;
entry->priv = priv;
entry->next = NULL;
DRM_LOCK();
if (dev->magiclist[hash].tail) {
dev->magiclist[hash].tail->next = entry;
dev->magiclist[hash].tail = entry;
} else {
dev->magiclist[hash].head = entry;
dev->magiclist[hash].tail = entry;
}
DRM_UNLOCK();
return (0);
}
/**
* Returns the file private associated with the given magic number.
*/
static struct drm_file *drm_find_file(struct drm_device *dev, drm_magic_t magic)
{
drm_magic_entry_t *pt;
int hash = drm_hash_magic(magic);
DRM_SPINLOCK_ASSERT(&dev->dev_lock);
for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
if (pt->magic == magic) {
return pt->priv;
}
}
return NULL;
}
/**
* Find the file with the given magic number.
*
* \param dev DRM device.
* \param magic magic number.
*
* Searches in drm_device::magiclist within all files with the same hash key
* the one with matching magic number, while holding the drm_device::struct_sem
* lock.
*/
static drm_file_t *drm_find_file(drm_device_t *dev, drm_magic_t magic)
{
drm_file_t *retval = NULL;
drm_magic_entry_t *pt;
int hash = drm_hash_magic(magic);
down(&dev->struct_sem);
for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
if (pt->magic == magic) {
retval = pt->priv;
break;
}
}
up(&dev->struct_sem);
return retval;
}
drm_file_t *
drm_find_file(drm_device_t *dev, drm_magic_t magic)
{
drm_file_t *retval = NULL;
drm_magic_entry_t *pt;
int hash;
hash = drm_hash_magic(magic);
for (pt = dev->magiclist[hash].head; pt; pt = pt->next) {
if (pt->magic == magic) {
retval = pt->priv;
break;
}
}
return (retval);
}
