diff options
| author | George Sapountzis <gsap7@yahoo.gr> | 2006-10-02 05:46:42 +0300 |
|---|---|---|
| committer | George Sapountzis <gsap7@yahoo.gr> | 2006-10-02 22:47:23 +0300 |
| commit | f3deef730d52c94ce21ada7e4ceb63aa28a8601b (patch) | |
| tree | e68d16345e3700c9b173397632a0ff9214e4bd5c /linux-core | |
| parent | 25760c30d4aedb370423d0bb03c014cab47b5d4f (diff) | |
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.
Diffstat (limited to 'linux-core')
| -rw-r--r-- | linux-core/drmP.h | 3 | ||||
| -rw-r--r-- | linux-core/drm_bufs.c | 10 | ||||
| -rw-r--r-- | linux-core/drm_vm.c | 16 |
3 files changed, 25 insertions, 4 deletions
diff --git a/linux-core/drmP.h b/linux-core/drmP.h index 5c9644e0..2bbec70c 100644 --- a/linux-core/drmP.h +++ b/linux-core/drmP.h @@ -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; diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c index abd7c829..a2a3dbf7 100644 --- a/linux-core/drm_bufs.c +++ b/linux-core/drm_bufs.c @@ -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) diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c index 9672269a..adff7d1a 100644 --- a/linux-core/drm_vm.c +++ b/linux-core/drm_vm.c @@ -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) */ |