summaryrefslogtreecommitdiff
path: root/linux/drm_sg_tmp.h
diff options
context:
space:
mode:
Diffstat (limited to 'linux/drm_sg_tmp.h')
-rw-r--r--linux/drm_sg_tmp.h309
1 files changed, 0 insertions, 309 deletions
diff --git a/linux/drm_sg_tmp.h b/linux/drm_sg_tmp.h
deleted file mode 100644
index 95cb1fc7..00000000
--- a/linux/drm_sg_tmp.h
+++ /dev/null
@@ -1,309 +0,0 @@
-/**
- * \file drm_sg_tmp.h
- * IOCTLs to manage scatter/gather memory
- *
- * \author Gareth Hughes <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.
- */
-
-
-#if __HAVE_SG
-
-
-#define __NO_VERSION__
-#include <linux/config.h>
-#include <linux/vmalloc.h>
-#include "drmP.h"
-
-
-/**
- * Define to non-zero to verify that each page points to its virtual address,
- * and vice versa, in sg_alloc().
- */
-#define DEBUG_SCATTER 0
-
-
-/**
- * Free scatter/gather memory.
- *
- * \param entry scatter/gather memory entry to free, as returned by sg_alloc().
- */
-void DRM(sg_free)( drm_sg_mem_t *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 );
-}
-
-/**
- * Allocate scatter/gather memory.
- *
- * \param size size of memory to allocate.
- * \return pointer to a drm_sg_mem structure on success or NULL on failure.
- */
-drm_sg_mem_t * DRM(sg_alloc)( unsigned long size )
-{
- drm_sg_mem_t *entry;
- unsigned long pages, i, j;
-
- DRM_DEBUG( "%s\n", __FUNCTION__ );
-
- entry = DRM(alloc)( sizeof(*entry), DRM_MEM_SGLISTS );
- if ( !entry )
- return NULL;
-
- memset( entry, 0, sizeof(*entry) );
-
- pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
- DRM_DEBUG( "sg size=%ld pages=%ld\n", 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 NULL;
- }
-
- 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 NULL;
- }
- memset( (void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr) );
-
- entry->virtual = vmalloc_32( 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 NULL;
- }
-
- /* 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 = (unsigned long)entry->virtual;
-
- DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
- DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual );
-
- for ( i = entry->handle, 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]);
- }
-
-#if DEBUG_SCATTER
- {
- 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 entry;
-
- failed:
- DRM(sg_free)( entry );
- return NULL;
-}
-
-
-/**********************************************************************/
-/** \name Ioctl's
- *
- * These expose the scatter/gather memory functions to user-space,
- * doing the necessary parameter verification and book-keeping to avoid memory
- * leaks.
- *
- * In the current implementation only one scatter/gather memory block can be
- * allocated per device at a given instance.
- *
- * The information about the currently allocated scatter/gather memory block is
- * stored in drm_device_t::sg.
- */
-/*@{*/
-
-/**
- * Wrapper ioctl around sg_alloc().
- *
- * \param inode device inode.
- * \param filp file pointer.
- * \param cmd command.
- * \param arg user argument, pointing to a drm_scatter_gather structure.
- * \return zero on success or a negative number on failure.
- */
-int DRM(sg_alloc_ioctl)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
-{
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_scatter_gather_t request;
- drm_sg_mem_t *entry;
-
- DRM_DEBUG( "%s\n", __FUNCTION__ );
-
- if ( dev->sg )
- return -EINVAL;
-
- if ( copy_from_user( &request,
- (drm_scatter_gather_t *)arg,
- sizeof(request) ) )
- return -EFAULT;
-
- entry = DRM(sg_alloc)( request.size );
- if ( !entry )
- return -ENOMEM;
-
- request.handle = entry->handle;
-
- if ( copy_to_user( (drm_scatter_gather_t *)arg,
- &request,
- sizeof(request) ) ) {
- DRM(sg_free)( entry );
- return -EFAULT;
- }
-
- dev->sg = entry;
-
- return 0;
-}
-
-/** Wrapper around sg_free().
- *
- * \param inode device inode.
- * \param filp file pointer.
- * \param cmd command.
- * \param arg user argument, pointing to a drm_scatter_gather structure.
- * \return zero on success or a negative number on failure.
- */
-int DRM(sg_free_ioctl)( struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg )
-{
- drm_file_t *priv = filp->private_data;
- drm_device_t *dev = priv->dev;
- drm_scatter_gather_t request;
- drm_sg_mem_t *entry;
-
- if ( copy_from_user( &request,
- (drm_scatter_gather_t *)arg,
- sizeof(request) ) )
- return -EFAULT;
-
- entry = dev->sg;
- dev->sg = NULL;
-
- if ( !entry || entry->handle != request.handle )
- return -EINVAL;
-
- DRM_DEBUG( "sg free virtual = %p\n", entry->virtual );
-
- DRM(sg_free)( entry );
-
- return 0;
-}
-
-/*@}*/
-
-
-/**
- * Called by takedown() to free the scatter/gather memory resources associated
- * with a given device, i.e., to free drm_device_t::sg.
- */
-void DRM(sg_cleanup)(drm_device_t *dev)
-{
- if ( dev->sg ) {
- DRM(sg_free)( dev->sg );
- dev->sg = NULL;
- }
-}
-
-
-#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 17:39:52 +0000