diff options
Diffstat (limited to 'linux-core/drm_memory.c')
-rw-r--r-- | linux-core/drm_memory.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/linux-core/drm_memory.c b/linux-core/drm_memory.c index 9a53fa82..a1aaa8f5 100644 --- a/linux-core/drm_memory.c +++ b/linux-core/drm_memory.c @@ -213,6 +213,49 @@ void drm_free_pages(unsigned long address, int order, int area) } #if __OS_HAS_AGP +static void *agp_remap(unsigned long offset, unsigned long size, + drm_device_t * dev) +{ + unsigned long *phys_addr_map, i, num_pages = + PAGE_ALIGN(size) / PAGE_SIZE; + struct drm_agp_mem *agpmem; + struct page **page_map; + void *addr; + + size = PAGE_ALIGN(size); + +#ifdef __alpha__ + offset -= dev->hose->mem_space->start; +#endif + + for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) + if (agpmem->bound <= offset + && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= + (offset + size)) + break; + if (!agpmem) + return NULL; + + /* + * OK, we're mapping AGP space on a chipset/platform on which memory accesses by + * the CPU do not get remapped by the GART. We fix this by using the kernel's + * page-table instead (that's probably faster anyhow...). + */ + /* note: use vmalloc() because num_pages could be large... */ + page_map = vmalloc(num_pages * sizeof(struct page *)); + if (!page_map) + return NULL; + + phys_addr_map = + agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE; + for (i = 0; i < num_pages; ++i) + page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT); + addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); + vfree(page_map); + + return addr; +} + /** Wrapper around agp_allocate_memory() */ #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11) DRM_AGP_MEM *drm_alloc_agp(drm_device_t *dev, int pages, u32 type) @@ -243,7 +286,15 @@ int drm_unbind_agp(DRM_AGP_MEM * handle) { return drm_agp_unbind_memory(handle); } + +#else /* __OS_HAS_AGP*/ +static void *agp_remap(unsigned long offset, unsigned long size, + drm_device_t * dev) +{ + return NULL; +} #endif /* agp */ + #endif /* debug_memory */ void drm_core_ioremap(struct drm_map *map, struct drm_device *dev) |