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Bug 6242: [mach64] Use private DMA buffers, part #3. 

Add DRM_PCI_BUFFER_RO flag for mapping PCI DMA buffer read-only. An additional
flag is needed, since PCI DMA buffers do not have an associated map.
main
George Sapountzis 2006-10-02 05:46:42 +03:00
parent 25760c30d4
commit f3deef730d
5 changed files with 29 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
libdrm/xf86drm.h
View File

@ -149,7 +149,8 @@ typedef enum {
DRM_PAGE_ALIGN = 0x01,
DRM_AGP_BUFFER = 0x02,
DRM_SG_BUFFER = 0x04,
DRM_FB_BUFFER = 0x08
DRM_FB_BUFFER = 0x08,
DRM_PCI_BUFFER_RO = 0x10
} drmBufDescFlags;
typedef enum {

3
linux-core/drmP.h
View File

@ -449,7 +449,8 @@ typedef struct drm_device_dma {
enum {
_DRM_DMA_USE_AGP = 0x01,
_DRM_DMA_USE_SG = 0x02,
_DRM_DMA_USE_FB = 0x04
_DRM_DMA_USE_FB = 0x04,
_DRM_DMA_USE_PCI_RO = 0x08
} flags;
} drm_device_dma_t;

10
linux-core/drm_bufs.c
View File

@ -942,6 +942,9 @@ int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
request->count = entry->buf_count;
request->size = size;
if (request->flags & _DRM_PCI_BUFFER_RO)
dma->flags = _DRM_DMA_USE_PCI_RO;
atomic_dec(&dev->buf_alloc);
return 0;
@ -1528,9 +1531,10 @@ int drm_freebufs(struct inode *inode, struct file *filp,
* \param arg pointer to a drm_buf_map structure.
* \return zero on success or a negative number on failure.
*
* Maps the AGP or SG buffer region with do_mmap(), and copies information
* about each buffer into user space. The PCI buffers are already mapped on the
* addbufs_pci() call.
* Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
* about each buffer into user space. For PCI buffers, it calls do_mmap() with
* offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
* drm_mmap_dma().
*/
int drm_mapbufs(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)

16
linux-core/drm_vm.c
View File

@ -506,6 +506,22 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
}
unlock_kernel();
if (!capable(CAP_SYS_ADMIN) &&
(dma->flags & _DRM_DMA_USE_PCI_RO)) {
vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
#if defined(__i386__) || defined(__x86_64__)
pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
#else
/* Ye gads this is ugly. With more thought
we could move this up higher and use
`protection_map' instead. */
vma->vm_page_prot =
__pgprot(pte_val
(pte_wrprotect
(__pte(pgprot_val(vma->vm_page_prot)))));
#endif
}
vma->vm_ops = &drm_vm_dma_ops;
#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */

3
shared-core/drm.h
View File

@ -416,7 +416,8 @@ typedef struct drm_buf_desc {
_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_FB_BUFFER = 0x08 /**< Buffer is in frame buffer */
_DRM_FB_BUFFER = 0x08, /**< Buffer is in frame buffer */
_DRM_PCI_BUFFER_RO = 0x10 /**< Map PCI DMA buffer read-only */
} flags;
unsigned long agp_start; /**<
* Start address of where the AGP buffers are