mga_bufs.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/* mga_bufs.c -- IOCTLs to manage buffers -*- linux-c -*-
 * Created: Thu Jan 6 01:47:26 2000 by [e-mail]
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 * 
 * Authors: Rickard E. (Rik) Faith <[e-mail]>
 *	    Jeff Hartmann <[e-mail]>
 *
 */

#define __NO_VERSION__
#include "drmP.h"
#include "mga_drv.h"
#include "linux/un.h"


int mga_addbufs_agp(struct inode *inode, struct file *filp, unsigned int cmd,
		    unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->dev;
	drm_device_dma_t *dma = dev->dma;
	drm_buf_desc_t request;
	drm_buf_entry_t *entry;
	drm_buf_t *buf;
	unsigned long offset;
	unsigned long agp_offset;
	int count;
	int order;
	int size;
	int alignment;
	int page_order;
	int total;
	int byte_count;
	int i;

	if (!dma) return -EINVAL;

	if (copy_from_user(&request,
			   (drm_buf_desc_t *)arg,
			   sizeof(request)))
		return -EFAULT;

	count = request.count;
	order = drm_order(request.size);
	size	= 1 << order;
	agp_offset = request.agp_start;
	alignment  = (request.flags & _DRM_PAGE_ALIGN) ? PAGE_ALIGN(size):size;
	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total = PAGE_SIZE << page_order;
	byte_count = 0;

	DRM_DEBUG("count: %d\n", count);
	DRM_DEBUG("order: %d\n", order);
	DRM_DEBUG("size: %d\n", size);
	DRM_DEBUG("agp_offset: %ld\n", agp_offset);
	DRM_DEBUG("alignment: %d\n", alignment);
	DRM_DEBUG("page_order: %d\n", page_order);
	DRM_DEBUG("total: %d\n", total);
	DRM_DEBUG("byte_count: %d\n", byte_count);

	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
	if (dev->queue_count) return -EBUSY; /* Not while in use */
	spin_lock(&dev->count_lock);
	if (dev->buf_use) {
		spin_unlock(&dev->count_lock);
		return -EBUSY;
	}
	atomic_inc(&dev->buf_alloc);
	spin_unlock(&dev->count_lock);
   
	down(&dev->struct_sem);
	entry = &dma->bufs[order];
	if (entry->buf_count) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM; /* May only call once for each order */
	}

	/* This isnt neccessarily a good limit, but we have to stop a dumb
	   32 bit overflow problem below */
	   
	if ( count < 0 || count > 4096)
	{
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -EINVAL;
	}
		   
	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	memset(entry->buflist, 0, count * sizeof(*entry->buflist));
   
	entry->buf_size   = size;
	entry->page_order = page_order;
	offset = 0;

   
	while(entry->buf_count < count) {
		buf = &entry->buflist[entry->buf_count];
		buf->idx = dma->buf_count + entry->buf_count;
		buf->total = alignment;
		buf->order = order;
		buf->used = 0;

		buf->offset = offset; /* Hrm */
		buf->bus_address = dev->agp->base + agp_offset + offset;
		buf->address = (void *)(agp_offset + offset + dev->agp->base);
		buf->next = NULL;
		buf->waiting = 0;
		buf->pending = 0;
		init_waitqueue_head(&buf->dma_wait);
		buf->pid = 0;

		buf->dev_private = drm_alloc(sizeof(drm_mga_buf_priv_t),
					     DRM_MEM_BUFS);
		buf->dev_priv_size = sizeof(drm_mga_buf_priv_t);

#if DRM_DMA_HISTOGRAM
		buf->time_queued = 0;
		buf->time_dispatched = 0;
		buf->time_completed = 0;
		buf->time_freed = 0;
#endif
		offset = offset + alignment;
		entry->buf_count++;
		byte_count += PAGE_SIZE << page_order;
	}
   
	dma->buflist = drm_realloc(dma->buflist,
				   dma->buf_count * sizeof(*dma->buflist),
				   (dma->buf_count + entry->buf_count)
				   * sizeof(*dma->buflist),
				   DRM_MEM_BUFS);
	for (i = dma->buf_count; i < dma->buf_count + entry->buf_count; i++)
		dma->buflist[i] = &entry->buflist[i - dma->buf_count];
   
	dma->buf_count  += entry->buf_count;

	DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);

	dma->byte_count += byte_count;

	DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);

	drm_freelist_create(&entry->freelist, entry->buf_count);
	for (i = 0; i < entry->buf_count; i++) {
		drm_freelist_put(dev, &entry->freelist, &entry->buflist[i]);
	}
   
	up(&dev->struct_sem);
   
	request.count = entry->buf_count;
	request.size  = size;
   
	if (copy_to_user((drm_buf_desc_t *)arg,
			 &request,
			 sizeof(request)))
		return -EFAULT;
   
	atomic_dec(&dev->buf_alloc);

	DRM_DEBUG("count: %d\n", count);
	DRM_DEBUG("order: %d\n", order);
	DRM_DEBUG("size: %d\n", size);
	DRM_DEBUG("agp_offset: %ld\n", agp_offset);
	DRM_DEBUG("alignment: %d\n", alignment);
	DRM_DEBUG("page_order: %d\n", page_order);
	DRM_DEBUG("total: %d\n", total);
	DRM_DEBUG("byte_count: %d\n", byte_count);

	dma->flags = _DRM_DMA_USE_AGP;

	DRM_DEBUG("dma->flags : %x\n", dma->flags);

	return 0;
}

int mga_addbufs_pci(struct inode *inode, struct file *filp, unsigned int cmd,
		    unsigned long arg)
{
   	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->dev;
	drm_device_dma_t *dma	 = dev->dma;
	drm_buf_desc_t	 request;
	int		 count;
	int		 order;
	int		 size;
	int		 total;
	int		 page_order;
	drm_buf_entry_t	 *entry;
	unsigned long	 page;
	drm_buf_t	 *buf;
	int		 alignment;
	unsigned long	 offset;
	int		 i;
	int		 byte_count;
	int		 page_count;

	if (!dma) return -EINVAL;

	if (copy_from_user(&request,
			   (drm_buf_desc_t *)arg,
			   sizeof(request)))
		return -EFAULT;

	count	   = request.count;
	order	   = drm_order(request.size);
	size	   = 1 << order;
	
	DRM_DEBUG("count = %d, size = %d (%d), order = %d, queue_count = %d\n",
		  request.count, request.size, size, order, dev->queue_count);

	if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL;
	if (dev->queue_count) return -EBUSY; /* Not while in use */

	alignment  = (request.flags & _DRM_PAGE_ALIGN) ? PAGE_ALIGN(size):size;
	page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
	total	   = PAGE_SIZE << page_order;

	spin_lock(&dev->count_lock);
	if (dev->buf_use) {
		spin_unlock(&dev->count_lock);
		return -EBUSY;
	}
	atomic_inc(&dev->buf_alloc);
	spin_unlock(&dev->count_lock);
	
	down(&dev->struct_sem);
	entry = &dma->bufs[order];
	if (entry->buf_count) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;	/* May only call once for each order */
	}
	
	if(count < 0 || count > 4096)
	{
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -EINVAL;
	}
	
	entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
				   DRM_MEM_BUFS);
	if (!entry->buflist) {
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	memset(entry->buflist, 0, count * sizeof(*entry->buflist));

	entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
				   DRM_MEM_SEGS);
	if (!entry->seglist) {
		drm_free(entry->buflist,
			 count * sizeof(*entry->buflist),
			 DRM_MEM_BUFS);
		up(&dev->struct_sem);
		atomic_dec(&dev->buf_alloc);
		return -ENOMEM;
	}
	memset(entry->seglist, 0, count * sizeof(*entry->seglist));

	dma->pagelist = drm_realloc(dma->pagelist,
				    dma->page_count * sizeof(*dma->pagelist),
				    (dma->page_count + (count << page_order))
				    * sizeof(*dma->pagelist),
				    DRM_MEM_PAGES);
	DRM_DEBUG("pagelist: %d entries\n",
		  dma->page_count + (count << page_order));


	entry->buf_size	  = size;
	entry->page_order = page_order;
	byte_count	  = 0;
	page_count	  = 0;
	while (entry->buf_count < count) {
		if (!(page = drm_alloc_pages(page_order, DRM_MEM_DMA))) break;
		entry->seglist[entry->seg_count++] = page;
		for (i = 0; i < (1 << page_order); i++) {
			DRM_DEBUG("page %d @ 0x%08lx\n",
				  dma->page_count + page_count,
				  page + PAGE_SIZE * i);
			dma->pagelist[dma->page_count + page_count++]
				= page + PAGE_SIZE * i;
		}
		for (offset = 0;
		     offset + size <= total && entry->buf_count < count;