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664 lines
18 KiB
C
664 lines
18 KiB
C
/**
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* \file drm_vm.c
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* Memory mapping for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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#if defined(__ia64__)
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#include <linux/efi.h>
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#endif
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static void drm_vm_open(struct vm_area_struct *vma);
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static void drm_vm_close(struct vm_area_struct *vma);
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/**
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* \c nopage method for AGP virtual memory.
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*
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* \param vma virtual memory area.
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Find the right map and if it's AGP memory find the real physical page to
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* map, get the page, increment the use count and return it.
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*/
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#if __OS_HAS_AGP
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static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
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unsigned long address)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_map_t *map = NULL;
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drm_map_list_t *r_list;
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struct list_head *list;
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/*
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* Find the right map
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*/
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if (!drm_core_has_AGP(dev))
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goto vm_nopage_error;
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if (!dev->agp || !dev->agp->cant_use_aperture)
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goto vm_nopage_error;
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list_for_each(list, &dev->maplist->head) {
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r_list = list_entry(list, drm_map_list_t, head);
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map = r_list->map;
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if (!map)
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continue;
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if (r_list->user_token == VM_OFFSET(vma))
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break;
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}
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if (map && map->type == _DRM_AGP) {
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unsigned long offset = address - vma->vm_start;
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unsigned long baddr = map->offset + offset;
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struct drm_agp_mem *agpmem;
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struct page *page;
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#ifdef __alpha__
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/*
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* Adjust to a bus-relative address
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*/
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baddr -= dev->hose->mem_space->start;
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#endif
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/*
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* It's AGP memory - find the real physical page to map
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*/
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for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
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if (agpmem->bound <= baddr &&
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agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
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break;
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}
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if (!agpmem)
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goto vm_nopage_error;
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/*
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* Get the page, inc the use count, and return it
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*/
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offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
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page = virt_to_page(__va(agpmem->memory->memory[offset]));
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get_page(page);
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DRM_DEBUG
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("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
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baddr, __va(agpmem->memory->memory[offset]), offset,
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page_count(page));
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return page;
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}
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vm_nopage_error:
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return NOPAGE_SIGBUS; /* Disallow mremap */
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}
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#else /* __OS_HAS_AGP */
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static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
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unsigned long address)
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{
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return NOPAGE_SIGBUS;
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}
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#endif /* __OS_HAS_AGP */
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/**
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* \c nopage method for shared virtual memory.
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*
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* \param vma virtual memory area.
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Get the the mapping, find the real physical page to map, get the page, and
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* return it.
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*/
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static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
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unsigned long address)
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{
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drm_map_t *map = (drm_map_t *) vma->vm_private_data;
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unsigned long offset;
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unsigned long i;
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struct page *page;
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if (address > vma->vm_end)
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return NOPAGE_SIGBUS; /* Disallow mremap */
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if (!map)
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return NOPAGE_OOM; /* Nothing allocated */
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offset = address - vma->vm_start;
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i = (unsigned long)map->handle + offset;
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page = (map->type == _DRM_CONSISTENT) ?
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virt_to_page((void *)i) : vmalloc_to_page((void *)i);
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if (!page)
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return NOPAGE_OOM;
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get_page(page);
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DRM_DEBUG("shm_nopage 0x%lx\n", address);
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return page;
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}
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/**
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* \c close method for shared virtual memory.
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*
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* \param vma virtual memory area.
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*
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* Deletes map information if we are the last
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* person to close a mapping and it's not in the global maplist.
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*/
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static void drm_vm_shm_close(struct vm_area_struct *vma)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_vma_entry_t *pt, *prev, *next;
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drm_map_t *map;
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drm_map_list_t *r_list;
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struct list_head *list;
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int found_maps = 0;
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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atomic_dec(&dev->vma_count);
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map = vma->vm_private_data;
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down(&dev->struct_sem);
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for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
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next = pt->next;
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if (pt->vma->vm_private_data == map)
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found_maps++;
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if (pt->vma == vma) {
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if (prev) {
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prev->next = pt->next;
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} else {
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dev->vmalist = pt->next;
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}
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drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
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} else {
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prev = pt;
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}
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}
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/* We were the only map that was found */
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if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
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/* Check to see if we are in the maplist, if we are not, then
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* we delete this mappings information.
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*/
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found_maps = 0;
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list = &dev->maplist->head;
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list_for_each(list, &dev->maplist->head) {
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r_list = list_entry(list, drm_map_list_t, head);
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if (r_list->map == map)
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found_maps++;
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}
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if (!found_maps) {
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drm_dma_handle_t dmah;
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switch (map->type) {
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case _DRM_REGISTERS:
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case _DRM_FRAME_BUFFER:
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if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
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int retcode;
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retcode = mtrr_del(map->mtrr,
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map->offset,
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map->size);
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DRM_DEBUG("mtrr_del = %d\n", retcode);
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}
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drm_ioremapfree(map->handle, map->size, dev);
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break;
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case _DRM_SHM:
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vfree(map->handle);
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break;
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case _DRM_AGP:
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case _DRM_SCATTER_GATHER:
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break;
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case _DRM_CONSISTENT:
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dmah.vaddr = map->handle;
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dmah.busaddr = map->offset;
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dmah.size = map->size;
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__drm_pci_free(dev, &dmah);
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break;
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}
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drm_free(map, sizeof(*map), DRM_MEM_MAPS);
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}
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}
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up(&dev->struct_sem);
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}
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/**
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* \c nopage method for DMA virtual memory.
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*
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* \param vma virtual memory area.
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Determine the page number from the page offset and get it from drm_device_dma::pagelist.
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*/
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static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
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unsigned long address)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_device_dma_t *dma = dev->dma;
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unsigned long offset;
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unsigned long page_nr;
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struct page *page;
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if (!dma)
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return NOPAGE_SIGBUS; /* Error */
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if (address > vma->vm_end)
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return NOPAGE_SIGBUS; /* Disallow mremap */
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if (!dma->pagelist)
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return NOPAGE_OOM; /* Nothing allocated */
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offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
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page_nr = offset >> PAGE_SHIFT;
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page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
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get_page(page);
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DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
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return page;
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}
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/**
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* \c nopage method for scatter-gather virtual memory.
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*
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* \param vma virtual memory area.
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* \param address access address.
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* \return pointer to the page structure.
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*
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* Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
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*/
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static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
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unsigned long address)
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{
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drm_map_t *map = (drm_map_t *) vma->vm_private_data;
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_sg_mem_t *entry = dev->sg;
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unsigned long offset;
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unsigned long map_offset;
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unsigned long page_offset;
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struct page *page;
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if (!entry)
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return NOPAGE_SIGBUS; /* Error */
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if (address > vma->vm_end)
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return NOPAGE_SIGBUS; /* Disallow mremap */
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if (!entry->pagelist)
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return NOPAGE_OOM; /* Nothing allocated */
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offset = address - vma->vm_start;
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map_offset = map->offset - (unsigned long)dev->sg->virtual;
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page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
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page = entry->pagelist[page_offset];
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get_page(page);
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return page;
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}
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static struct page *drm_vm_nopage(struct vm_area_struct *vma,
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unsigned long address, int *type)
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{
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if (type)
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*type = VM_FAULT_MINOR;
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return drm_do_vm_nopage(vma, address);
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}
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static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
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unsigned long address, int *type)
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{
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if (type)
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*type = VM_FAULT_MINOR;
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return drm_do_vm_shm_nopage(vma, address);
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}
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static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
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unsigned long address, int *type)
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{
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if (type)
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*type = VM_FAULT_MINOR;
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return drm_do_vm_dma_nopage(vma, address);
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}
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static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
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unsigned long address, int *type)
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{
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if (type)
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*type = VM_FAULT_MINOR;
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return drm_do_vm_sg_nopage(vma, address);
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}
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/** AGP virtual memory operations */
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static struct vm_operations_struct drm_vm_ops = {
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.nopage = drm_vm_nopage,
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.open = drm_vm_open,
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.close = drm_vm_close,
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};
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/** Shared virtual memory operations */
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static struct vm_operations_struct drm_vm_shm_ops = {
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.nopage = drm_vm_shm_nopage,
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.open = drm_vm_open,
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.close = drm_vm_shm_close,
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};
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/** DMA virtual memory operations */
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static struct vm_operations_struct drm_vm_dma_ops = {
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.nopage = drm_vm_dma_nopage,
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.open = drm_vm_open,
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.close = drm_vm_close,
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};
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/** Scatter-gather virtual memory operations */
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static struct vm_operations_struct drm_vm_sg_ops = {
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.nopage = drm_vm_sg_nopage,
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.open = drm_vm_open,
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.close = drm_vm_close,
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};
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/**
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* \c open method for shared virtual memory.
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*
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* \param vma virtual memory area.
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*
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* Create a new drm_vma_entry structure as the \p vma private data entry and
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* add it to drm_device::vmalist.
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*/
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static void drm_vm_open(struct vm_area_struct *vma)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_vma_entry_t *vma_entry;
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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atomic_inc(&dev->vma_count);
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vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
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if (vma_entry) {
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down(&dev->struct_sem);
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vma_entry->vma = vma;
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vma_entry->next = dev->vmalist;
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vma_entry->pid = current->pid;
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dev->vmalist = vma_entry;
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up(&dev->struct_sem);
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}
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}
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|
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/**
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* \c close method for all virtual memory types.
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*
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* \param vma virtual memory area.
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*
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* Search the \p vma private data entry in drm_device::vmalist, unlink it, and
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* free it.
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*/
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static void drm_vm_close(struct vm_area_struct *vma)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->head->dev;
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drm_vma_entry_t *pt, *prev;
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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atomic_dec(&dev->vma_count);
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|
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down(&dev->struct_sem);
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for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
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if (pt->vma == vma) {
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if (prev) {
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prev->next = pt->next;
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} else {
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dev->vmalist = pt->next;
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}
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drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
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break;
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}
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}
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up(&dev->struct_sem);
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}
|
|
|
|
/**
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* mmap DMA memory.
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*
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* \param filp file pointer.
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* \param vma virtual memory area.
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* \return zero on success or a negative number on failure.
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*
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* Sets the virtual memory area operations structure to vm_dma_ops, the file
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* pointer, and calls vm_open().
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*/
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static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
|
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{
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drm_file_t *priv = filp->private_data;
|
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drm_device_t *dev;
|
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drm_device_dma_t *dma;
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unsigned long length = vma->vm_end - vma->vm_start;
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|
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lock_kernel();
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dev = priv->head->dev;
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dma = dev->dma;
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DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
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vma->vm_start, vma->vm_end, VM_OFFSET(vma));
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|
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/* Length must match exact page count */
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if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
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unlock_kernel();
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return -EINVAL;
|
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}
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unlock_kernel();
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|
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vma->vm_ops = &drm_vm_dma_ops;
|
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|
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vma->vm_flags |= VM_RESERVED; /* Don't swap */
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|
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vma->vm_file = filp; /* Needed for drm_vm_open() */
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drm_vm_open(vma);
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return 0;
|
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}
|
|
|
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unsigned long drm_core_get_map_ofs(drm_map_t * map)
|
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{
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return map->offset;
|
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}
|
|
|
|
EXPORT_SYMBOL(drm_core_get_map_ofs);
|
|
|
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unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
|
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{
|
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#ifdef __alpha__
|
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return dev->hose->dense_mem_base - dev->hose->mem_space->start;
|
|
#else
|
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return 0;
|
|
#endif
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_core_get_reg_ofs);
|
|
|
|
/**
|
|
* mmap DMA memory.
|
|
*
|
|
* \param filp file pointer.
|
|
* \param vma virtual memory area.
|
|
* \return zero on success or a negative number on failure.
|
|
*
|
|
* If the virtual memory area has no offset associated with it then it's a DMA
|
|
* area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
|
|
* checks that the restricted flag is not set, sets the virtual memory operations
|
|
* according to the mapping type and remaps the pages. Finally sets the file
|
|
* pointer and calls vm_open().
|
|
*/
|
|
int drm_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->head->dev;
|
|
drm_map_t *map = NULL;
|
|
drm_map_list_t *r_list;
|
|
unsigned long offset = 0;
|
|
struct list_head *list;
|
|
|
|
DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
|
|
vma->vm_start, vma->vm_end, VM_OFFSET(vma));
|
|
|
|
if (!priv->authenticated)
|
|
return -EACCES;
|
|
|
|
/* We check for "dma". On Apple's UniNorth, it's valid to have
|
|
* the AGP mapped at physical address 0
|
|
* --BenH.
|
|
*/
|
|
if (!VM_OFFSET(vma)
|
|
#if __OS_HAS_AGP
|
|
&& (!dev->agp
|
|
|| dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
|
|
#endif
|
|
)
|
|
return drm_mmap_dma(filp, vma);
|
|
|
|
/* A sequential search of a linked list is
|
|
fine here because: 1) there will only be
|
|
about 5-10 entries in the list and, 2) a
|
|
DRI client only has to do this mapping
|
|
once, so it doesn't have to be optimized
|
|
for performance, even if the list was a
|
|
bit longer. */
|
|
list_for_each(list, &dev->maplist->head) {
|
|
|
|
r_list = list_entry(list, drm_map_list_t, head);
|
|
map = r_list->map;
|
|
if (!map)
|
|
continue;
|
|
if (r_list->user_token == VM_OFFSET(vma))
|
|
break;
|
|
}
|
|
|
|
if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
|
|
return -EPERM;
|
|
|
|
/* Check for valid size. */
|
|
if (map->size != vma->vm_end - vma->vm_start)
|
|
return -EINVAL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
|
|
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
|
|
}
|
|
|
|
switch (map->type) {
|
|
case _DRM_AGP:
|
|
if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
|
|
/*
|
|
* On some platforms we can't talk to bus dma address from the CPU, so for
|
|
* memory of type DRM_AGP, we'll deal with sorting out the real physical
|
|
* pages and mappings in nopage()
|
|
*/
|
|
#if defined(__powerpc__)
|
|
pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
|
|
#endif
|
|
vma->vm_ops = &drm_vm_ops;
|
|
break;
|
|
}
|
|
/* fall through to _DRM_FRAME_BUFFER... */
|
|
case _DRM_FRAME_BUFFER:
|
|
case _DRM_REGISTERS:
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
|
|
pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
|
|
pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
|
|
}
|
|
#elif defined(__powerpc__)
|
|
pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
|
|
if (map->type == _DRM_REGISTERS)
|
|
pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED;
|
|
#endif
|
|
vma->vm_flags |= VM_IO; /* not in core dump */
|
|
#if defined(__ia64__)
|
|
if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
|
|
vma->vm_page_prot =
|
|
pgprot_writecombine(vma->vm_page_prot);
|
|
else
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
#endif
|
|
offset = dev->driver->get_reg_ofs(dev);
|
|
#ifdef __sparc__
|
|
if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start,
|
|
(map->offset + offset) >> PAGE_SHIFT,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot))
|
|
#else
|
|
if (io_remap_pfn_range(vma, vma->vm_start,
|
|
(map->offset + offset) >> PAGE_SHIFT,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot))
|
|
#endif
|
|
return -EAGAIN;
|
|
DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
|
|
" offset = 0x%lx\n",
|
|
map->type,
|
|
vma->vm_start, vma->vm_end, map->offset + offset);
|
|
vma->vm_ops = &drm_vm_ops;
|
|
break;
|
|
case _DRM_SHM:
|
|
case _DRM_CONSISTENT:
|
|
/* Consistent memory is really like shared memory. It's only
|
|
* allocate in a different way */
|
|
vma->vm_ops = &drm_vm_shm_ops;
|
|
vma->vm_private_data = (void *)map;
|
|
/* Don't let this area swap. Change when
|
|
DRM_KERNEL advisory is supported. */
|
|
vma->vm_flags |= VM_RESERVED;
|
|
break;
|
|
case _DRM_SCATTER_GATHER:
|
|
vma->vm_ops = &drm_vm_sg_ops;
|
|
vma->vm_private_data = (void *)map;
|
|
vma->vm_flags |= VM_RESERVED;
|
|
break;
|
|
default:
|
|
return -EINVAL; /* This should never happen. */
|
|
}
|
|
vma->vm_flags |= VM_RESERVED; /* Don't swap */
|
|
|
|
vma->vm_file = filp; /* Needed for drm_vm_open() */
|
|
drm_vm_open(vma);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(drm_mmap);
|