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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/drm_memory.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/drm_memory.c')
-rw-r--r-- | drivers/gpu/drm/drm_memory.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c new file mode 100644 index 0000000000..d2e1dccd81 --- /dev/null +++ b/drivers/gpu/drm/drm_memory.c @@ -0,0 +1,138 @@ +/* + * \file drm_memory.c + * Memory management wrappers for DRM + * + * \author Rickard E. (Rik) Faith <faith@valinux.com> + * \author Gareth Hughes <gareth@valinux.com> + */ + +/* + * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * 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 + * VA LINUX SYSTEMS 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/export.h> +#include <linux/highmem.h> +#include <linux/pci.h> +#include <linux/vmalloc.h> + +#include <drm/drm_cache.h> +#include <drm/drm_device.h> + +#include "drm_legacy.h" + +#if IS_ENABLED(CONFIG_AGP) + +#ifdef HAVE_PAGE_AGP +# include <asm/agp.h> +#else +# ifdef __powerpc__ +# define PAGE_AGP pgprot_noncached_wc(PAGE_KERNEL) +# else +# define PAGE_AGP PAGE_KERNEL +# endif +#endif + +static void *agp_remap(unsigned long offset, unsigned long size, + struct drm_device *dev) +{ + unsigned long i, num_pages = + PAGE_ALIGN(size) / PAGE_SIZE; + struct drm_agp_mem *agpmem; + struct page **page_map; + struct page **phys_page_map; + void *addr; + + size = PAGE_ALIGN(size); + +#ifdef __alpha__ + offset -= dev->hose->mem_space->start; +#endif + + list_for_each_entry(agpmem, &dev->agp->memory, head) + if (agpmem->bound <= offset + && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >= + (offset + size)) + break; + if (&agpmem->head == &dev->agp->memory) + 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(array_size(num_pages, sizeof(struct page *))); + if (!page_map) + return NULL; + + phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE); + for (i = 0; i < num_pages; ++i) + page_map[i] = phys_page_map[i]; + addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP); + vfree(page_map); + + return addr; +} + +#else /* CONFIG_AGP */ +static inline void *agp_remap(unsigned long offset, unsigned long size, + struct drm_device *dev) +{ + return NULL; +} + +#endif /* CONFIG_AGP */ + +void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev) +{ + if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) + map->handle = agp_remap(map->offset, map->size, dev); + else + map->handle = ioremap(map->offset, map->size); +} +EXPORT_SYMBOL(drm_legacy_ioremap); + +void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev) +{ + if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) + map->handle = agp_remap(map->offset, map->size, dev); + else + map->handle = ioremap_wc(map->offset, map->size); +} +EXPORT_SYMBOL(drm_legacy_ioremap_wc); + +void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev) +{ + if (!map->handle || !map->size) + return; + + if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP) + vunmap(map->handle); + else + iounmap(map->handle); +} +EXPORT_SYMBOL(drm_legacy_ioremapfree); |