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/**
* \file drm_vm.c
* Memory mapping for DRM
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
* Created: Mon Jan 4 08:58:31 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 "drmP.h"
#ifdef DRM_VM_NOPAGE
/**
* \c nopage method for AGP virtual memory.
*
* \param vma virtual memory area.
* \param address access address.
* \return pointer to the page structure.
*
* Find the right map and if it's AGP memory find the real physical page to
* map, get the page, increment the use count and return it.
*/
#if __OS_HAS_AGP
static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
unsigned long address)
{
struct drm_file *priv = vma->vm_file->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_map *map = NULL;
struct drm_map_list *r_list;
struct drm_hash_item *hash;
/*
* Find the right map
*/
if (!drm_core_has_AGP(dev))
goto vm_nopage_error;
if (!dev->agp || !dev->agp->cant_use_aperture)
goto vm_nopage_error;
if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
goto vm_nopage_error;
r_list = drm_hash_entry(hash, struct drm_map_list, hash);
map = r_list->map;
if (map && map->type == _DRM_AGP) {
unsigned long offset = address - vma->vm_start;
unsigned long baddr = map->offset + offset;
struct drm_agp_mem *agpmem;
struct page *page;
#ifdef __alpha__
/*
* Adjust to a bus-relative address
*/
baddr -= dev->hose->mem_space->start;
#endif
/*
* It's AGP memory - find the real physical page to map
*/
list_for_each_entry(agpmem, &dev->agp->memory, head) {
if (agpmem->bound <= baddr &&
agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
break;
}
if (!agpmem)
goto vm_nopage_error;
/*
* Get the page, inc the use count, and return it
*/
offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
page = virt_to_page(__va(agpmem->memory->memory[offset]));
get_page(page);
#if 0
/* page_count() not defined everywhere */
DRM_DEBUG
("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
baddr, __va(agpmem->memory->memory[offset]), offset,
page_count(page));
#endif
return page;
}
vm_nopage_error:
return NOPAGE_SIGBUS; /* Disallow mremap */
}
#else /* __OS_HAS_AGP */
static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
unsigned long address)
{
return NOPAGE_SIGBUS;
}
#endif /* __OS_HAS_AGP */
/**
* \c nopage method for shared virtual memory.
*
* \param vma virtual memory area.
* \param address access address.
* \return pointer to the page structure.
*
* Get the mapping, find the real physical page to map, get the page, and
* return it.
*/
static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
unsigned long address)
{
struct drm_map *map = (struct drm_map *) vma->vm_private_data;
unsigned long offset;
unsigned long i;
struct page *page;
if (address > vma->vm_end)
return NOPAGE_SIGBUS; /* Disallow mremap */
if (!map)
return NOPAGE_SIGBUS; /* Nothing allocated */
offset = address - vma->vm_start;
i = (unsigned long)map->handle + offset;
page = vmalloc_to_page((void *)i);
if (!page)
return NOPAGE_SIGBUS;
get_page(page);
DRM_DEBUG("0x%lx\n", address);
return page;
}
/**
* \c nopage method for DMA virtual memory.
*
* \param vma virtual memory area.
* \param address access address.
* \return pointer to the page structure.
*
* Determine the page number from the page offset and get it from drm_device_dma::pagelist.
*/
static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
unsigned long address)
{
struct drm_file *priv = vma->vm_file->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_device_dma *dma = dev->dma;
unsigned long offset;
unsigned long page_nr;
struct page *page;
if (!dma)
return NOPAGE_SIGBUS; /* Error */
if (address > vma->vm_end)
return NOPAGE_SIGBUS; /* Disallow mremap */
if (!dma->pagelist)
return NOPAGE_SIGBUS; /* Nothing allocated */
offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
page_nr = offset >> PAGE_SHIFT;
page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
get_page(page);
DRM_DEBUG("0x%lx (page %lu)\n", address, page_nr);
return page;
}
/**
* \c nopage method for scatter-gather virtual memory.
*
* \param vma virtual memory area.
* \param address access address.
* \return pointer to the page structure.
*
* Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
*/
static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
unsigned long address)
{
struct drm_map *map = (struct drm_map *) vma->vm_private_data;
struct drm_file *priv = vma->vm_file->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_sg_mem *entry = dev->sg;
unsigned long offset;
unsigned long map_offset;
unsigned long page_offset;
struct page *page;
DRM_DEBUG("\n");
if (!entry)
return NOPAGE_SIGBUS; /* Error */
if (address > vma->vm_end)
return NOPAGE_SIGBUS; /* Disallow mremap */
if (!entry->pagelist)
return NOPAGE_SIGBUS; /* Nothing allocated */
offset = address - vma->vm_start;
map_offset = map->offset - (unsigned long)dev->sg->virtual;
page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
page = entry->pagelist[page_offset];
get_page(page);
return page;
}
struct page *drm_vm_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
if (type)
*type = VM_FAULT_MINOR;
return drm_do_vm_nopage(vma, address);
}
struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
if (type)
*type = VM_FAULT_MINOR;
return drm_do_vm_shm_nopage(vma, address);
}
struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
if (type)
*type = VM_FAULT_MINOR;
return drm_do_vm_dma_nopage(vma, address);
}
struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
if (type)
*type = VM_FAULT_MINOR;
return drm_do_vm_sg_nopage(vma, address);
}
#endif
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