diff options
Diffstat (limited to 'drivers/char/drm/drm_scatter.c')
| -rw-r--r-- | drivers/char/drm/drm_scatter.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/drivers/char/drm/drm_scatter.c b/drivers/char/drm/drm_scatter.c deleted file mode 100644 index b2b0f3d4171..00000000000 --- a/drivers/char/drm/drm_scatter.c +++ /dev/null @@ -1,227 +0,0 @@ -/** - * \file drm_scatter.c - * IOCTLs to manage scatter/gather memory - * - * \author Gareth Hughes <gareth@valinux.com> - */ - -/* - * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com - * - * 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. - */ - -#include <linux/vmalloc.h> -#include "drmP.h" - -#define DEBUG_SCATTER 0 - -static inline void *drm_vmalloc_dma(unsigned long size) -{ -#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) - return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE); -#else - return vmalloc_32(size); -#endif -} - -void drm_sg_cleanup(struct drm_sg_mem * entry) -{ - struct page *page; - int i; - - for (i = 0; i < entry->pages; i++) { - page = entry->pagelist[i]; - if (page) - ClearPageReserved(page); - } - - vfree(entry->virtual); - - drm_free(entry->busaddr, - entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES); - drm_free(entry->pagelist, - entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES); - drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); -} - -#ifdef _LP64 -# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1))) -#else -# define ScatterHandle(x) (unsigned int)(x) -#endif - -int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request) -{ - struct drm_sg_mem *entry; - unsigned long pages, i, j; - - DRM_DEBUG("\n"); - - if (!drm_core_check_feature(dev, DRIVER_SG)) - return -EINVAL; - - if (dev->sg) - return -EINVAL; - - entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS); - if (!entry) - return -ENOMEM; - - memset(entry, 0, sizeof(*entry)); - pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; - DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages); - - entry->pages = pages; - entry->pagelist = drm_alloc(pages * sizeof(*entry->pagelist), - DRM_MEM_PAGES); - if (!entry->pagelist) { - drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); - return -ENOMEM; - } - - memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist)); - - entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr), - DRM_MEM_PAGES); - if (!entry->busaddr) { - drm_free(entry->pagelist, - entry->pages * sizeof(*entry->pagelist), - DRM_MEM_PAGES); - drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); - return -ENOMEM; - } - memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr)); - - entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT); - if (!entry->virtual) { - drm_free(entry->busaddr, - entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES); - drm_free(entry->pagelist, - entry->pages * sizeof(*entry->pagelist), - DRM_MEM_PAGES); - drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); - return -ENOMEM; - } - - /* This also forces the mapping of COW pages, so our page list - * will be valid. Please don't remove it... - */ - memset(entry->virtual, 0, pages << PAGE_SHIFT); - - entry->handle = ScatterHandle((unsigned long)entry->virtual); - - DRM_DEBUG("handle = %08lx\n", entry->handle); - DRM_DEBUG("virtual = %p\n", entry->virtual); - - for (i = (unsigned long)entry->virtual, j = 0; j < pages; - i += PAGE_SIZE, j++) { - entry->pagelist[j] = vmalloc_to_page((void *)i); - if (!entry->pagelist[j]) - goto failed; - SetPageReserved(entry->pagelist[j]); - } - - request->handle = entry->handle; - - dev->sg = entry; - -#if DEBUG_SCATTER - /* Verify that each page points to its virtual address, and vice - * versa. - */ - { - int error = 0; - - for (i = 0; i < pages; i++) { - unsigned long *tmp; - - tmp = page_address(entry->pagelist[i]); - for (j = 0; - j < PAGE_SIZE / sizeof(unsigned long); - j++, tmp++) { - *tmp = 0xcafebabe; - } - tmp = (unsigned long *)((u8 *) entry->virtual + - (PAGE_SIZE * i)); - for (j = 0; - j < PAGE_SIZE / sizeof(unsigned long); - j++, tmp++) { - if (*tmp != 0xcafebabe && error == 0) { - error = 1; - DRM_ERROR("Scatter allocation error, " - "pagelist does not match " - "virtual mapping\n"); - } - } - tmp = page_address(entry->pagelist[i]); - for (j = 0; - j < PAGE_SIZE / sizeof(unsigned long); - j++, tmp++) { - *tmp = 0; - } - } - if (error == 0) - DRM_ERROR("Scatter allocation matches pagelist\n"); - } -#endif - - return 0; - - failed: - drm_sg_cleanup(entry); - return -ENOMEM; -} -EXPORT_SYMBOL(drm_sg_alloc); - - -int drm_sg_alloc_ioctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_scatter_gather *request = data; - - return drm_sg_alloc(dev, request); - -} - -int drm_sg_free(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_scatter_gather *request = data; - struct drm_sg_mem *entry; - - if (!drm_core_check_feature(dev, DRIVER_SG)) - return -EINVAL; - - entry = dev->sg; - dev->sg = NULL; - - if (!entry || entry->handle != request->handle) - return -EINVAL; - - DRM_DEBUG("virtual = %p\n", entry->virtual); - - drm_sg_cleanup(entry); - - return 0; -} |