diff options
Diffstat (limited to 'drivers/gpu/drm/via/via_drv.h')
| -rw-r--r-- | drivers/gpu/drm/via/via_drv.h | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/gpu/drm/via/via_drv.h b/drivers/gpu/drm/via/via_drv.h index 368185b80184..9e6a0c5f316c 100644 --- a/drivers/gpu/drm/via/via_drv.h +++ b/drivers/gpu/drm/via/via_drv.h @@ -24,8 +24,13 @@ #ifndef _VIA_DRV_H_ #define _VIA_DRV_H_ -#include <drm/drm_mm.h> +#include <linux/jiffies.h> +#include <linux/sched.h> +#include <linux/sched/signal.h> +#include <linux/wait.h> + #include <drm/drm_legacy.h> +#include <drm/drm_mm.h> #define DRIVER_AUTHOR "Various" @@ -140,6 +145,41 @@ static inline void via_write8_mask(struct drm_via_private *dev_priv, writeb(tmp, (void __iomem *)(dev_priv->mmio->handle + reg)); } +/* + * Poll in a loop waiting for 'contidition' to be true. + * Note: A direct replacement with wait_event_interruptible_timeout() + * will not work unless driver is updated to emit wake_up() + * in relevant places that can impact the 'condition' + * + * Returns: + * ret keeps current value if 'condition' becomes true + * ret = -BUSY if timeout happens + * ret = -EINTR if a signal interrupted the waiting period + */ +#define VIA_WAIT_ON( ret, queue, timeout, condition ) \ +do { \ + DECLARE_WAITQUEUE(entry, current); \ + unsigned long end = jiffies + (timeout); \ + add_wait_queue(&(queue), &entry); \ + \ + for (;;) { \ + __set_current_state(TASK_INTERRUPTIBLE); \ + if (condition) \ + break; \ + if (time_after_eq(jiffies, end)) { \ + ret = -EBUSY; \ + break; \ + } \ + schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \ + if (signal_pending(current)) { \ + ret = -EINTR; \ + break; \ + } \ + } \ + __set_current_state(TASK_RUNNING); \ + remove_wait_queue(&(queue), &entry); \ +} while (0) + extern const struct drm_ioctl_desc via_ioctls[]; extern int via_max_ioctl; |