drm/linux-core/drm_ttm.c

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/**************************************************************************
*
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* Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
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* All Rights Reserved.
*
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* 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, sub license, 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:
*
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* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
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* 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS 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
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
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**************************************************************************/
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/*
* Authors: Thomas Hellstr<EFBFBD>m <thomas-at-tungstengraphics-dot-com>
*/
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#include "drmP.h"
static void drm_ttm_ipi_handler(void *null)
{
flush_agp_cache();
}
void drm_ttm_cache_flush(void)
{
if (on_each_cpu(drm_ttm_ipi_handler, NULL, 1, 1) != 0)
DRM_ERROR("Timed out waiting for drm cache flush.\n");
}
EXPORT_SYMBOL(drm_ttm_cache_flush);
/**
* Allocates storage for pointers to the pages that back the ttm.
*
* Uses kmalloc if possible. Otherwise falls back to vmalloc.
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*/
static void drm_ttm_alloc_page_directory(struct drm_ttm *ttm)
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{
unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
ttm->pages = NULL;
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if (drm_alloc_memctl(size))
return;
if (size <= PAGE_SIZE)
ttm->pages = drm_calloc(1, size, DRM_MEM_TTM);
if (!ttm->pages) {
ttm->pages = vmalloc_user(size);
if (ttm->pages)
ttm->page_flags |= DRM_TTM_PAGEDIR_VMALLOC;
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}
if (!ttm->pages)
drm_free_memctl(size);
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}
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static void drm_ttm_free_page_directory(struct drm_ttm *ttm)
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{
unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
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if (ttm->page_flags & DRM_TTM_PAGEDIR_VMALLOC) {
vfree(ttm->pages);
ttm->page_flags &= ~DRM_TTM_PAGEDIR_VMALLOC;
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} else {
drm_free(ttm->pages, size, DRM_MEM_TTM);
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}
drm_free_memctl(size);
ttm->pages = NULL;
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}
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static struct page *drm_ttm_alloc_page(void)
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{
struct page *page;
if (drm_alloc_memctl(PAGE_SIZE))
return NULL;
page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
if (!page) {
drm_free_memctl(PAGE_SIZE);
return NULL;
}
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
SetPageReserved(page);
#endif
return page;
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}
/*
* Change caching policy for the linear kernel map
* for range of pages in a ttm.
*/
static int drm_ttm_set_caching(struct drm_ttm *ttm, int noncached)
{
int i;
struct page **cur_page;
int do_tlbflush = 0;
if ((ttm->page_flags & DRM_TTM_PAGE_UNCACHED) == noncached)
return 0;
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if (noncached)
drm_ttm_cache_flush();
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages + i;
if (*cur_page) {
if (!PageHighMem(*cur_page)) {
if (noncached) {
map_page_into_agp(*cur_page);
} else {
unmap_page_from_agp(*cur_page);
}
do_tlbflush = 1;
}
}
}
if (do_tlbflush)
flush_agp_mappings();
DRM_FLAG_MASKED(ttm->page_flags, noncached, DRM_TTM_PAGE_UNCACHED);
return 0;
}
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static void drm_ttm_free_user_pages(struct drm_ttm *ttm)
{
int write;
int dirty;
struct page *page;
int i;
BUG_ON(!(ttm->page_flags & DRM_TTM_PAGE_USER));
write = ((ttm->page_flags & DRM_TTM_PAGE_WRITE) != 0);
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dirty = ((ttm->page_flags & DRM_TTM_PAGE_USER_DIRTY) != 0);
for (i = 0; i < ttm->num_pages; ++i) {
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page = ttm->pages[i];
if (page == NULL)
continue;
if (page == ttm->dummy_read_page) {
BUG_ON(write);
continue;
}
if (write && dirty && !PageReserved(page))
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set_page_dirty_lock(page);
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ttm->pages[i] = NULL;
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put_page(page);
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}
}
static void drm_ttm_free_alloced_pages(struct drm_ttm *ttm)
{
int i;
struct drm_buffer_manager *bm = &ttm->dev->bm;
struct page **cur_page;
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages + i;
if (*cur_page) {
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
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ClearPageReserved(*cur_page);
#endif
if (page_count(*cur_page) != 1)
DRM_ERROR("Erroneous page count. Leaking pages.\n");
if (page_mapped(*cur_page))
DRM_ERROR("Erroneous map count. Leaking page mappings.\n");
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__free_page(*cur_page);
drm_free_memctl(PAGE_SIZE);
--bm->cur_pages;
}
}
}
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/*
* Free all resources associated with a ttm.
*/
int drm_ttm_destroy(struct drm_ttm *ttm)
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{
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struct drm_ttm_backend *be;
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if (!ttm)
return 0;
be = ttm->be;
if (be) {
be->func->destroy(be);
ttm->be = NULL;
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}
if (ttm->pages) {
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if (ttm->page_flags & DRM_TTM_PAGE_UNCACHED)
drm_ttm_set_caching(ttm, 0);
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if (ttm->page_flags & DRM_TTM_PAGE_USER)
drm_ttm_free_user_pages(ttm);
else
drm_ttm_free_alloced_pages(ttm);
drm_ttm_free_page_directory(ttm);
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}
drm_ctl_free(ttm, sizeof(*ttm), DRM_MEM_TTM);
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return 0;
}
struct page *drm_ttm_get_page(struct drm_ttm *ttm, int index)
{
struct page *p;
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struct drm_buffer_manager *bm = &ttm->dev->bm;
p = ttm->pages[index];
if (!p) {
p = drm_ttm_alloc_page();
if (!p)
return NULL;
ttm->pages[index] = p;
++bm->cur_pages;
}
return p;
}
EXPORT_SYMBOL(drm_ttm_get_page);
/**
* drm_ttm_set_user:
*
* @ttm: the ttm to map pages to. This must always be
* a freshly created ttm.
*
* @tsk: a pointer to the address space from which to map
* pages.
*
* @write: a boolean indicating that write access is desired
*
* start: the starting address
*
* Map a range of user addresses to a new ttm object. This
* provides access to user memory from the graphics device.
*/
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int drm_ttm_set_user(struct drm_ttm *ttm,
struct task_struct *tsk,
unsigned long start,
unsigned long num_pages)
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{
struct mm_struct *mm = tsk->mm;
int ret;
int write = (ttm->page_flags & DRM_TTM_PAGE_WRITE) != 0;
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BUG_ON(num_pages != ttm->num_pages);
BUG_ON((ttm->page_flags & DRM_TTM_PAGE_USER) == 0);
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down_read(&mm->mmap_sem);
ret = get_user_pages(tsk, mm, start, num_pages,
write, 0, ttm->pages, NULL);
up_read(&mm->mmap_sem);
if (ret != num_pages && write) {
drm_ttm_free_user_pages(ttm);
return -ENOMEM;
}
return 0;
}
/**
* drm_ttm_populate:
*
* @ttm: the object to allocate pages for
*
* Allocate pages for all unset page entries, then
* call the backend to create the hardware mappings
*/
int drm_ttm_populate(struct drm_ttm *ttm)
{
struct page *page;
unsigned long i;
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struct drm_ttm_backend *be;
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if (ttm->state != ttm_unpopulated)
return 0;
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be = ttm->be;
for (i = 0; i < ttm->num_pages; ++i) {
page = drm_ttm_get_page(ttm, i);
if (!page)
return -ENOMEM;
}
be->func->populate(be, ttm->num_pages, ttm->pages, ttm->dummy_read_page);
ttm->state = ttm_unbound;
return 0;
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}
/**
* drm_ttm_create:
*
* @dev: the drm_device
*
* @size: The size (in bytes) of the desired object
*
* @page_flags: various DRM_TTM_PAGE_* flags. See drm_object.h.
*
* Allocate and initialize a ttm, leaving it unpopulated at this time
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*/
struct drm_ttm *drm_ttm_create(struct drm_device *dev, unsigned long size,
uint32_t page_flags, struct page *dummy_read_page)
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{
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struct drm_bo_driver *bo_driver = dev->driver->bo_driver;
struct drm_ttm *ttm;
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if (!bo_driver)
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return NULL;
ttm = drm_ctl_calloc(1, sizeof(*ttm), DRM_MEM_TTM);
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if (!ttm)
return NULL;
ttm->dev = dev;
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atomic_set(&ttm->vma_count, 0);
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ttm->destroy = 0;
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ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ttm->page_flags = page_flags;
ttm->dummy_read_page = dummy_read_page;
/*
* Account also for AGP module memory usage.
*/
drm_ttm_alloc_page_directory(ttm);
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if (!ttm->pages) {
drm_ttm_destroy(ttm);
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DRM_ERROR("Failed allocating page table\n");
return NULL;
}
ttm->be = bo_driver->create_ttm_backend_entry(dev);
if (!ttm->be) {
drm_ttm_destroy(ttm);
DRM_ERROR("Failed creating ttm backend entry\n");
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return NULL;
}
ttm->state = ttm_unpopulated;
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return ttm;
}
/**
* drm_ttm_evict:
*
* @ttm: the object to be unbound from the aperture.
*
* Transition a ttm from bound to evicted, where it
* isn't present in the aperture, but various caches may
* not be consistent.
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*/
void drm_ttm_evict(struct drm_ttm *ttm)
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{
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struct drm_ttm_backend *be = ttm->be;
int ret;
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if (ttm->state == ttm_bound) {
ret = be->func->unbind(be);
BUG_ON(ret);
}
ttm->state = ttm_evicted;
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}
/**
* drm_ttm_fixup_caching:
*
* @ttm: the object to set unbound
*
* XXX this function is misnamed. Transition a ttm from evicted to
* unbound, flushing caches as appropriate.
*/
void drm_ttm_fixup_caching(struct drm_ttm *ttm)
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{
if (ttm->state == ttm_evicted) {
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struct drm_ttm_backend *be = ttm->be;
if (be->func->needs_ub_cache_adjust(be))
drm_ttm_set_caching(ttm, 0);
ttm->state = ttm_unbound;
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}
}
/**
* drm_ttm_unbind:
*
* @ttm: the object to unbind from the graphics device
*
* Unbind an object from the aperture. This removes the mappings
* from the graphics device and flushes caches if necessary.
*/
void drm_ttm_unbind(struct drm_ttm *ttm)
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{
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if (ttm->state == ttm_bound)
drm_ttm_evict(ttm);
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drm_ttm_fixup_caching(ttm);
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}
/**
* drm_ttm_bind:
*
* @ttm: the ttm object to bind to the graphics device
*
* @bo_mem: the aperture memory region which will hold the object
*
* Bind a ttm object to the aperture. This ensures that the necessary
* pages are allocated, flushes CPU caches as needed and marks the
* ttm as DRM_TTM_PAGE_USER_DIRTY to indicate that it may have been
* modified by the GPU
*/
int drm_ttm_bind(struct drm_ttm *ttm, struct drm_bo_mem_reg *bo_mem)
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{
struct drm_bo_driver *bo_driver = ttm->dev->driver->bo_driver;
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int ret = 0;
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struct drm_ttm_backend *be;
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if (!ttm)
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return -EINVAL;
if (ttm->state == ttm_bound)
return 0;
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be = ttm->be;
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ret = drm_ttm_populate(ttm);
if (ret)
return ret;
if (ttm->state == ttm_unbound && !(bo_mem->flags & DRM_BO_FLAG_CACHED))
drm_ttm_set_caching(ttm, DRM_TTM_PAGE_UNCACHED);
else if ((bo_mem->flags & DRM_BO_FLAG_CACHED_MAPPED) &&
bo_driver->ttm_cache_flush)
bo_driver->ttm_cache_flush(ttm);
ret = be->func->bind(be, bo_mem);
if (ret) {
ttm->state = ttm_evicted;
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DRM_ERROR("Couldn't bind backend.\n");
return ret;
}
ttm->state = ttm_bound;
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if (ttm->page_flags & DRM_TTM_PAGE_USER)
ttm->page_flags |= DRM_TTM_PAGE_USER_DIRTY;
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return 0;
}
EXPORT_SYMBOL(drm_ttm_bind);