drm: add framebuffer maps

The patch makes drmAddBufs/drmMapBufs can handle buffers in video memory

The attached patch adds a new buffer type DRM_FB_BUFFER. It works like
AGP memory but uses video memory.

From: Austin Yuan <austinyuan@viatech.com.cn>
Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/char/drm/drm.h b/drivers/char/drm/drm.h
index 50c4d98..3a4745f 100644 (file)
--- a/drivers/char/drm/drm.h
+++ b/drivers/char/drm/drm.h
@@ -369,7 +369,8 @@ typedef struct drm_buf_desc {
        enum {
                _DRM_PAGE_ALIGN = 0x01, /**< Align on page boundaries for DMA */
                _DRM_AGP_BUFFER = 0x02, /**< Buffer is in AGP space */
-               _DRM_SG_BUFFER  = 0x04  /**< Scatter/gather memory buffer */
+               _DRM_SG_BUFFER  = 0x04, /**< Scatter/gather memory buffer */
+               _DRM_FB_BUFFER  = 0x08  /**< Buffer is in frame buffer */
        }             flags;
        unsigned long agp_start; /**< 
                                  * Start address of where the AGP buffers are

diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index 5df09cc..804e622 100644 (file)
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -96,6 +96,7 @@
 #define DRIVER_IRQ_SHARED  0x80
 #define DRIVER_IRQ_VBL     0x100
 #define DRIVER_DMA_QUEUE   0x200
+#define DRIVER_FB_DMA      0x400
 
 /***********************************************************************/
 /** \name Begin the DRM... */
@@ -474,7 +475,8 @@ typedef struct drm_device_dma {
        unsigned long     byte_count;
        enum {
                _DRM_DMA_USE_AGP = 0x01,
-               _DRM_DMA_USE_SG  = 0x02
+               _DRM_DMA_USE_SG  = 0x02,
+               _DRM_DMA_USE_FB  = 0x04
        } flags;
 
 } drm_device_dma_t;

diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
index 89f301f..7c20dc3 100644 (file)
--- a/drivers/char/drm/drm_bufs.c
+++ b/drivers/char/drm/drm_bufs.c
@@ -935,6 +935,172 @@ static int drm_addbufs_sg( struct inode *inode, struct file *filp,
        return 0;
 }
 
+int drm_addbufs_fb(struct inode *inode, struct file *filp,
+                   unsigned int cmd, unsigned long arg)
+{
+       drm_file_t *priv = filp->private_data;
+       drm_device_t *dev = priv->head->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;
+       drm_buf_t **temp_buflist;
+       drm_buf_desc_t __user *argp = (void __user *)arg;
+
+       if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
+               return -EINVAL;
+    
+       if (!dma)
+               return -EINVAL;
+
+       if (copy_from_user(&request, argp, sizeof(request)))
+               return -EFAULT;
+
+       count = request.count;
+       order = drm_order(request.size);
+       size = 1 << order;
+
+       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;
+       agp_offset = request.agp_start;
+
+       DRM_DEBUG("count:      %d\n", count);
+       DRM_DEBUG("order:      %d\n", order);
+       DRM_DEBUG("size:       %d\n", size);
+       DRM_DEBUG("agp_offset: %lu\n", agp_offset);
+       DRM_DEBUG("alignment:  %d\n", alignment);
+       DRM_DEBUG("page_order: %d\n", page_order);
+       DRM_DEBUG("total:      %d\n", total);
+
+       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 */
+       }
+
+       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 = (dma->byte_count + offset);
+               buf->bus_address = agp_offset + offset;
+               buf->address = (void *)(agp_offset + offset);
+               buf->next = NULL;
+               buf->waiting = 0;
+               buf->pending = 0;
+               init_waitqueue_head(&buf->dma_wait);
+               buf->filp = NULL;
+
+               buf->dev_priv_size = dev->driver->dev_priv_size;
+               buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
+               if (!buf->dev_private) {
+                       /* Set count correctly so we free the proper amount. */
+                       entry->buf_count = count;
+                       drm_cleanup_buf_error(dev, entry);
+                       up(&dev->struct_sem);
+                       atomic_dec(&dev->buf_alloc);
+                       return -ENOMEM;
+               }
+               memset(buf->dev_private, 0, buf->dev_priv_size);
+
+               DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
+
+               offset += alignment;
+               entry->buf_count++;
+               byte_count += PAGE_SIZE << page_order;
+       }
+
+       DRM_DEBUG("byte_count: %d\n", byte_count);
+
+       temp_buflist = drm_realloc(dma->buflist,
+                                  dma->buf_count * sizeof(*dma->buflist),
+                                  (dma->buf_count + entry->buf_count)
+                                  * sizeof(*dma->buflist), DRM_MEM_BUFS);
+       if (!temp_buflist) {
+               /* Free the entry because it isn't valid */
+               drm_cleanup_buf_error(dev, entry);
+               up(&dev->struct_sem);
+               atomic_dec(&dev->buf_alloc);
+               return -ENOMEM;
+       }
+       dma->buflist = temp_buflist;
+
+       for (i = 0; i < entry->buf_count; i++) {
+               dma->buflist[i + dma->buf_count] = &entry->buflist[i];
+       }
+
+       dma->buf_count += entry->buf_count;
+       dma->byte_count += byte_count;
+
+       DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
+       DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
+
+       up(&dev->struct_sem);
+
+       request.count = entry->buf_count;
+       request.size = size;
+
+       if (copy_to_user(argp, &request, sizeof(request)))
+               return -EFAULT;
+
+       dma->flags = _DRM_DMA_USE_FB;
+
+       atomic_dec(&dev->buf_alloc);
+       return 0;
+}
+
 /**
  * Add buffers for DMA transfers (ioctl).
  *
@@ -970,6 +1136,8 @@ int drm_addbufs( struct inode *inode, struct file *filp,
 #endif
        if ( request.flags & _DRM_SG_BUFFER )
                return drm_addbufs_sg( inode, filp, cmd, arg );
+       else if ( request.flags & _DRM_FB_BUFFER)
+               return drm_addbufs_fb( inode, filp, cmd, arg );
        else
                return drm_addbufs_pci( inode, filp, cmd, arg );
 }
@@ -1214,8 +1382,11 @@ int drm_mapbufs( struct inode *inode, struct file *filp,
                return -EFAULT;
 
        if ( request.count >= dma->buf_count ) {
-               if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP)) ||
-                   (drm_core_check_feature(dev, DRIVER_SG) && (dma->flags & _DRM_DMA_USE_SG)) ) {
+               if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
+                   || (drm_core_check_feature(dev, DRIVER_SG) 
+                       && (dma->flags & _DRM_DMA_USE_SG))
+                   || (drm_core_check_feature(dev, DRIVER_FB_DMA)
+                       && (dma->flags & _DRM_DMA_USE_FB))) {
                        drm_map_t *map = dev->agp_buffer_map;
 
                        if ( !map ) {