C++ DRM_COPY_FROM_USER_IOCTL函数代码示例

static int mga_dma_clear(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = dev->dev_private;
	drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_mga_clear_t clear;

	LOCK_TEST_WITH_RETURN(dev, filp);

	DRM_COPY_FROM_USER_IOCTL(clear, (drm_mga_clear_t __user *) data,
				 sizeof(clear));

	if (sarea_priv->nbox > MGA_NR_SAREA_CLIPRECTS)
		sarea_priv->nbox = MGA_NR_SAREA_CLIPRECTS;

	WRAP_TEST_WITH_RETURN(dev_priv);

	mga_dma_dispatch_clear(dev, &clear);

	/* Make sure we restore the 3D state next time.
	 */
	dev_priv->sarea_priv->dirty |= MGA_UPLOAD_CONTEXT;

	return 0;
}

int i915_mem_destroy_heap( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_mem_destroy_heap_t destroyheap;
	struct mem_block **heap;

	if ( !dev_priv ) {
		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL( destroyheap, (drm_i915_mem_destroy_heap_t *)data,
				  sizeof(destroyheap) );

	heap = get_heap( dev_priv, destroyheap.region );
	if (!heap) {
		DRM_ERROR("get_heap failed");
		return DRM_ERR(EFAULT);
	}
	
	if (!*heap) {
		DRM_ERROR("heap not initialized?");
		return DRM_ERR(EFAULT);
	}

	i915_mem_takedown( heap );
	return 0;
}

/* Needs the lock as it touches the ring.
 */
int i915_irq_emit(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_i915_private_t *dev_priv = dev->dev_private;
	drm_i915_irq_emit_t emit;
	int result;

	LOCK_TEST_WITH_RETURN(dev, filp);

	if (!dev_priv) {
		DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL(emit, (drm_i915_irq_emit_t __user *) data,
				 sizeof(emit));

	result = i915_emit_irq(dev);

	if (DRM_COPY_TO_USER(emit.irq_seq, &result, sizeof(int))) {
		DRM_ERROR("copy_to_user\n");
		return DRM_ERR(EFAULT);
	}

	return 0;
}

int sis_ioctl_agp_alloc( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_sis_private_t *dev_priv = dev->dev_private;
	drm_sis_mem_t agp;
	PMemBlock block;
	int retval = 0;
   
	if (dev_priv == NULL || dev_priv->AGPHeap == NULL)
		return DRM_ERR(EINVAL);
  
	DRM_COPY_FROM_USER_IOCTL(agp, (drm_sis_mem_t *)data, sizeof(agp));
  
	block = mmAllocMem(dev_priv->AGPHeap, agp.size, 0, 0);
	if (block) {
		/* TODO */
		agp.offset = block->ofs;
		agp.free = (unsigned long)block;
		if (!add_alloc_set(agp.context, AGP_TYPE, agp.free)) {
			DRM_DEBUG("adding to allocation set fails\n");
			mmFreeMem((PMemBlock)agp.free);
			retval = -1;
		}
	} else {  
		agp.offset = 0;
		agp.size = 0;
		agp.free = 0;
	}

	DRM_COPY_TO_USER_IOCTL((drm_sis_mem_t *)data, agp, sizeof(agp));

	DRM_DEBUG("alloc agp, size = %d, offset = %d\n", agp.size, agp.offset);

	return retval;
}

int sis_ioctl_agp_init( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_sis_private_t *dev_priv = dev->dev_private;
	drm_sis_agp_t agp;

	if (dev_priv == NULL) {
		dev->dev_private = DRM(calloc)(1, sizeof(drm_sis_private_t),
		    DRM_MEM_DRIVER);
		dev_priv = dev->dev_private;
		if (dev_priv == NULL)
			return ENOMEM;
	}

	if (dev_priv->AGPHeap != NULL)
		return DRM_ERR(EINVAL);

	DRM_COPY_FROM_USER_IOCTL(agp, (drm_sis_agp_t *)data, sizeof(agp));

	dev_priv->AGPHeap = mmInit(agp.offset, agp.size);

	DRM_DEBUG("offset = %u, size = %u", agp.offset, agp.size);
  
	return 0;
}

int sis_fb_alloc( DRM_IOCTL_ARGS )
{
	drm_sis_mem_t fb;
	struct sis_memreq req;
	int retval = 0;

	DRM_COPY_FROM_USER_IOCTL(fb, (drm_sis_mem_t *)data, sizeof(fb));

	req.size = fb.size;
	sis_malloc(&req);
	if (req.offset) {
		/* TODO */
		fb.offset = req.offset;
		fb.free = req.offset;
		if (!add_alloc_set(fb.context, VIDEO_TYPE, fb.free)) {
			DRM_DEBUG("adding to allocation set fails\n");
			sis_free(req.offset);
			retval = DRM_ERR(EINVAL);
		}
	} else {  
		fb.offset = 0;
		fb.size = 0;
		fb.free = 0;
	}

	DRM_COPY_TO_USER_IOCTL((drm_sis_mem_t *)data, fb, sizeof(fb));

	DRM_DEBUG("alloc fb, size = %d, offset = %ld\n", fb.size, req.offset);

	return retval;
}

int radeon_mem_free( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_mem_free_t memfree;
	struct mem_block *block, **heap;

	if ( !dev_priv ) {
		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL( memfree, (drm_radeon_mem_free_t *)data,
				  sizeof(memfree) );

	heap = get_heap( dev_priv, memfree.region );
	if (!heap || !*heap)
		return DRM_ERR(EFAULT);
	
	block = find_block( *heap, memfree.region_offset );
	if (!block)
		return DRM_ERR(EFAULT);

	if (block->pid != DRM_CURRENTPID)
		return DRM_ERR(EPERM);

	free_block( block );	
	return 0;
}

int 
via_decoder_futex(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_via_futex_t fx;
	volatile int *lock;
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	drm_via_sarea_t *sAPriv = dev_priv->sarea_priv;
	int ret = 0;

	DRM_DEBUG("%s\n", __FUNCTION__);

	DRM_COPY_FROM_USER_IOCTL(fx, (drm_via_futex_t __user *) data,
				 sizeof(fx));

	if (fx.lock > VIA_NR_XVMC_LOCKS)
		return -EFAULT;

	lock = (int *)XVMCLOCKPTR(sAPriv, fx.lock);

	switch (fx.func) {
	case VIA_FUTEX_WAIT:
		DRM_WAIT_ON(ret, dev_priv->decoder_queue[fx.lock],
			    (fx.ms / 10) * (DRM_HZ / 100), *lock != fx.val);
		return ret;
	case VIA_FUTEX_WAKE:
		DRM_WAKEUP(&(dev_priv->decoder_queue[fx.lock]));
		return 0;
	}
	return 0;
}

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);
}

int mga_dma_flush( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
	drm_lock_t lock;

	LOCK_TEST_WITH_RETURN( dev, filp );

	DRM_COPY_FROM_USER_IOCTL( lock, (drm_lock_t *)data, sizeof(lock) );

	DRM_DEBUG( "%s%s%s\n",
		   (lock.flags & _DRM_LOCK_FLUSH) ?	"flush, " : "",
		   (lock.flags & _DRM_LOCK_FLUSH_ALL) ?	"flush all, " : "",
		   (lock.flags & _DRM_LOCK_QUIESCENT) ?	"idle, " : "" );

	WRAP_WAIT_WITH_RETURN( dev_priv );

	if ( lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL) ) {
		mga_do_dma_flush( dev_priv );
	}

	if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
#if MGA_DMA_DEBUG
		int ret = mga_do_wait_for_idle( dev_priv );
		if ( ret < 0 )
			DRM_INFO( "%s: -EBUSY\n", __FUNCTION__ );
		return ret;
#else
		return mga_do_wait_for_idle( dev_priv );
#endif
	} else {
		return 0;
	}
}

int radeon_mem_init_heap( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_mem_init_heap_t initheap;
	struct mem_block **heap;

	if ( !dev_priv ) {
		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
		return DRM_ERR(EINVAL);
	}

	DRM_COPY_FROM_USER_IOCTL( initheap, (drm_radeon_mem_init_heap_t *)data,
				  sizeof(initheap) );

	heap = get_heap( dev_priv, initheap.region );
	if (!heap) 
		return DRM_ERR(EFAULT);
	
	if (*heap) {
		DRM_ERROR("heap already initialized?");
		return DRM_ERR(EFAULT);
	}
		
	return init_heap( heap, initheap.start, initheap.size );
}

/* Called by the X Server to initialize the FB heap.  Allocations will fail
 * unless this is called.  Offset is the beginning of the heap from the
 * framebuffer offset (MaxXFBMem in XFree86).
 *
 * Memory layout according to Thomas Winischofer:
 * |------------------|DDDDDDDDDDDDDDDDDDDDDDDDDDDDD|HHHH|CCCCCCCCCCC|
 *
 *    X driver/sisfb                                  HW-   Command-
 *  framebuffer memory           DRI heap           Cursor   queue
 */
int sis_fb_init( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_sis_private_t *dev_priv = dev->dev_private;
	drm_sis_fb_t fb;

	DRM_COPY_FROM_USER_IOCTL(fb, (drm_sis_fb_t *)data, sizeof(fb));

	if (dev_priv == NULL) {
		dev->dev_private = DRM(calloc)(1, sizeof(drm_sis_private_t),
		    DRM_MEM_DRIVER);
		dev_priv = dev->dev_private;
		if (dev_priv == NULL)
			return ENOMEM;
	}

	if (dev_priv->FBHeap != NULL)
		return DRM_ERR(EINVAL);

	dev_priv->FBHeap = mmInit(fb.offset, fb.size);

	DRM_DEBUG("offset = %u, size = %u", fb.offset, fb.size);

	return 0;
}

int via_fb_init(DRM_IOCTL_ARGS)
{
	drm_via_fb_t fb;

	DRM_COPY_FROM_USER_IOCTL(fb, (drm_via_fb_t *) data, sizeof(fb));

	FBHeap = via_mmInit(fb.offset, fb.size);

	DRM_DEBUG("offset = %lu, size = %lu", (unsigned long)fb.offset, (unsigned long)fb.size);

	return 0;
}

int via_agp_init(DRM_IOCTL_ARGS)
{
	drm_via_agp_t agp;

	DRM_COPY_FROM_USER_IOCTL(agp, (drm_via_agp_t *) data, sizeof(agp));

	AgpHeap = via_mmInit(agp.offset, agp.size);

	DRM_DEBUG("offset = %lu, size = %lu", (unsigned long)agp.offset, (unsigned long)agp.size);

	return 0;
}

int 
via_dma_blit( DRM_IOCTL_ARGS )
{
	drm_via_dmablit_t xfer;
	int err;
	DRM_DEVICE;

	DRM_COPY_FROM_USER_IOCTL(xfer, (drm_via_dmablit_t __user *)data, sizeof(xfer));

	err = via_dmablit(dev, &xfer);

	DRM_COPY_TO_USER_IOCTL((void __user *)data, xfer, sizeof(xfer));

	return err;
}