diff options
Diffstat (limited to 'drivers/gpu/drm/drm_scatter.c')
| -rw-r--r-- | drivers/gpu/drm/drm_scatter.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_scatter.c b/drivers/gpu/drm/drm_scatter.c new file mode 100644 index 00000000000..b2b0f3d4171 --- /dev/null +++ b/drivers/gpu/drm/drm_scatter.c @@ -0,0 +1,227 @@ +/** + * \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; +} |