static int savage_bci_event_wait(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_savage_private_t *dev_priv = dev->dev_private;
drm_savage_event_wait_t *event = data;
unsigned int event_e, hw_e;
unsigned int event_w, hw_w;
DRM_DEBUG("\n");
UPDATE_EVENT_COUNTER();
if (dev_priv->status_ptr)
hw_e = dev_priv->status_ptr[1] & 0xffff;
else
hw_e = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
hw_w = dev_priv->event_wrap;
if (hw_e > dev_priv->event_counter)
hw_w--; /* hardware hasn't passed the last wrap yet */
event_e = event->count & 0xffff;
event_w = event->count >> 16;
/* Don't need to wait if
* - event counter wrapped since the event was emitted or
* - the hardware has advanced up to or over the event to wait for.
*/
if (event_w < hw_w || (event_w == hw_w && event_e <= hw_e))
return 0;
else
return dev_priv->wait_evnt(dev_priv, event_e);
}
static struct drm_buf *savage_freelist_get(struct drm_device * dev)
{
drm_savage_private_t *dev_priv = dev->dev_private;
drm_savage_buf_priv_t *tail = dev_priv->tail.prev;
uint16_t event;
unsigned int wrap;
DRM_DEBUG("\n");
UPDATE_EVENT_COUNTER();
if (dev_priv->status_ptr)
event = dev_priv->status_ptr[1] & 0xffff;
else
event = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
wrap = dev_priv->event_wrap;
if (event > dev_priv->event_counter)
wrap--; /* hardware hasn't passed the last wrap yet */
DRM_DEBUG(" tail=0x%04x %d\n", tail->age.event, tail->age.wrap);
DRM_DEBUG(" head=0x%04x %d\n", event, wrap);
if (tail->buf && (TEST_AGE(&tail->age, event, wrap) || event == 0)) {
drm_savage_buf_priv_t *next = tail->next;
drm_savage_buf_priv_t *prev = tail->prev;
prev->next = next;
next->prev = prev;
tail->next = tail->prev = NULL;
return tail->buf;
}
DRM_DEBUG("returning NULL, tail->buf=%p!\n", tail->buf);
return NULL;
}
void savage_dma_wait(drm_savage_private_t * dev_priv, unsigned int page)
{
uint16_t event;
unsigned int wrap;
/* Faked DMA buffer pages don't age. */
if (dev_priv->cmd_dma == &dev_priv->fake_dma)
return;
UPDATE_EVENT_COUNTER();
if (dev_priv->status_ptr)
event = dev_priv->status_ptr[1] & 0xffff;
else
event = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
wrap = dev_priv->event_wrap;
if (event > dev_priv->event_counter)
wrap--; /* hardware hasn't passed the last wrap yet */
if (dev_priv->dma_pages[page].age.wrap > wrap ||
(dev_priv->dma_pages[page].age.wrap == wrap &&
dev_priv->dma_pages[page].age.event > event)) {
if (dev_priv->wait_evnt(dev_priv,
dev_priv->dma_pages[page].age.event)
< 0)
DRM_ERROR("wait_evnt failed!\n");
}
}
static int savage_bci_event_wait(DRM_IOCTL_ARGS)
{
DRM_DEVICE;
drm_savage_private_t *dev_priv = dev->dev_private;
drm_savage_event_wait_t event;
unsigned int event_e, hw_e;
unsigned int event_w, hw_w;
DRM_DEBUG("\n");
DRM_COPY_FROM_USER_IOCTL(event, (drm_savage_event_wait_t __user *)data,
sizeof(event));
UPDATE_EVENT_COUNTER();
if (dev_priv->status_ptr)
hw_e = dev_priv->status_ptr[1] & 0xffff;
else
hw_e = SAVAGE_READ(SAVAGE_STATUS_WORD1) & 0xffff;
hw_w = dev_priv->event_wrap;
if (hw_e > dev_priv->event_counter)
hw_w--; /* hardware hasn't passed the last wrap yet */
event_e = event.count & 0xffff;
event_w = event.count >> 16;
/* Don't need to wait if
* - event counter wrapped since the event was emitted or
* - the hardware has advanced up to or over the event to wait for.
*/
if (event_w < hw_w || (event_w == hw_w && event_e <= hw_e) )
return 0;
else
return dev_priv->wait_evnt(dev_priv, event_e);
}
