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drm: DRM_I915_VBLANK_SWAP ioctl: Take drm_vblank_seq_type_t instead 

of pipe number.

Handle relative as well as absolute target sequence numbers.

Return error if target sequence has already passed, so userspace can deal with
this situation as it sees fit.

On success, return the sequence number of the vertical blank when the buffer
swap is expected to take place.

Also add DRM_IOCTL_I915_VBLANK_SWAP definition for userspace code that may want
to use ioctl() instead of drmCommandWriteRead().

Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
=?utf-8?q?Michel_D=C3=A4nzer?= 2006-10-24 23:38:54 +10:00 committed by airlied
parent a6b54f3f50
commit 541f29aad7
2 changed files with 40 additions and 6 deletions
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3
drivers/char/drm/i915_drm.h
View File

@ -149,6 +149,7 @@ typedef struct _drm_i915_sarea {
#define DRM_IOCTL_I915_DESTROY_HEAP DRM_IOW( DRM_COMMAND_BASE + DRM_I915_DESTROY_HEAP, drm_i915_mem_destroy_heap_t)
#define DRM_IOCTL_I915_SET_VBLANK_PIPE DRM_IOW( DRM_COMMAND_BASE + DRM_I915_SET_VBLANK_PIPE, drm_i915_vblank_pipe_t)
#define DRM_IOCTL_I915_GET_VBLANK_PIPE DRM_IOR( DRM_COMMAND_BASE + DRM_I915_GET_VBLANK_PIPE, drm_i915_vblank_pipe_t)
#define DRM_IOCTL_I915_VBLANK_SWAP DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_VBLANK_SWAP, drm_i915_vblank_swap_t)
/* Allow drivers to submit batchbuffers directly to hardware, relying
* on the security mechanisms provided by hardware.
@ -248,7 +249,7 @@ typedef struct drm_i915_vblank_pipe {
*/
typedef struct drm_i915_vblank_swap {
drm_drawable_t drawable;
unsigned int pipe;
drm_vblank_seq_type_t seqtype;
unsigned int sequence;
} drm_i915_vblank_swap_t;

43
drivers/char/drm/i915_irq.c
View File

@ -375,7 +375,7 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_vblank_swap_t swap;
drm_i915_vbl_swap_t *vbl_swap;
unsigned int irqflags;
unsigned int pipe, seqtype, irqflags, curseq;
struct list_head *list;
if (!dev_priv) {
@ -396,8 +396,23 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
DRM_COPY_FROM_USER_IOCTL(swap, (drm_i915_vblank_swap_t __user *) data,
sizeof(swap));
if (swap.pipe > 1 || !(dev_priv->vblank_pipe & (1 << swap.pipe))) {
DRM_ERROR("Invalid pipe %d\n", swap.pipe);
if (swap.seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
_DRM_VBLANK_SECONDARY)) {
DRM_ERROR("Invalid sequence type 0x%x\n", swap.seqtype);
return DRM_ERR(EINVAL);
}
pipe = (swap.seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
seqtype = swap.seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
if (seqtype == _DRM_VBLANK_RELATIVE && swap.sequence == 0) {
DRM_DEBUG("Not scheduling swap for current sequence\n");
return DRM_ERR(EINVAL);
}
if (!(dev_priv->vblank_pipe & (1 << pipe))) {
DRM_ERROR("Invalid pipe %d\n", pipe);
return DRM_ERR(EINVAL);
}
@ -411,13 +426,28 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
spin_unlock_irqrestore(&dev->drw_lock, irqflags);
curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received);
spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
switch (seqtype) {
case _DRM_VBLANK_RELATIVE:
swap.sequence += curseq;
break;
case _DRM_VBLANK_ABSOLUTE:
if ((curseq - swap.sequence) > (1<<23)) {
spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
DRM_DEBUG("Missed target sequence\n");
return DRM_ERR(EINVAL);
}
break;
}
list_for_each(list, &dev_priv->vbl_swaps.head) {
vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
if (vbl_swap->drw_id == swap.drawable &&
vbl_swap->pipe == swap.pipe &&
vbl_swap->pipe == pipe &&
vbl_swap->sequence == swap.sequence) {
spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
DRM_DEBUG("Already scheduled\n");
@ -437,7 +467,7 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
DRM_DEBUG("\n");
vbl_swap->drw_id = swap.drawable;
vbl_swap->pipe = swap.pipe;
vbl_swap->pipe = pipe;
vbl_swap->sequence = swap.sequence;
spin_lock_irqsave(&dev_priv->swaps_lock, irqflags);
@ -447,6 +477,9 @@ int i915_vblank_swap(DRM_IOCTL_ARGS)
spin_unlock_irqrestore(&dev_priv->swaps_lock, irqflags);
DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_swap_t __user *) data, swap,
sizeof(swap));
return 0;
}