--- /dev/null
+/**
+ * \file drm_scatter.h
+ * IOCTLs to manage scatter/gather memory
+ *
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Mon Dec 18 23:20:54 2000 by 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.
+ */
+
+#include <linux/config.h>
+#include <linux/vmalloc.h>
+#include "drmP.h"
+
+#define DEBUG_SCATTER 0
+
+void drm_sg_cleanup( 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 );
+}
+
+int drm_sg_alloc( 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 __user *argp = (void __user *)arg;
+ drm_scatter_gather_t request;
+ drm_sg_mem_t *entry;
+ unsigned long pages, i, j;
+
+ DRM_DEBUG( "%s\n", __FUNCTION__ );
+
+ if (!drm_core_check_feature(dev, DRIVER_SG))
+ return -EINVAL;
+
+ if ( dev->sg )
+ return -EINVAL;
+
+ if ( copy_from_user( &request, argp, sizeof(request) ) )
+ return -EFAULT;
+
+ entry = drm_alloc( sizeof(*entry), DRM_MEM_SGLISTS );
+ if ( !entry )
+ return -ENOMEM;
+
+ memset( entry, 0, sizeof(*entry) );
+
+ pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
+ DRM_DEBUG( "sg size=%ld pages=%ld\n", request.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 -ENOMEM;
+ }
+
+ 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 -ENOMEM;
+ }
+ 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 -ENOMEM;
+ }
+
+ /* 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]);
+ }
+
+ request.handle = entry->handle;
+
+ if ( copy_to_user( argp, &request, sizeof(request) ) ) {
+ drm_sg_cleanup( entry );
+ return -EFAULT;
+ }
+
+ dev->sg = entry;
+
+#if DEBUG_SCATTER
+ /* Verify that each page points to its virtual address, and vice
+ * versa.
+ */
+ {
+ 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 0;
+
+ failed:
+ drm_sg_cleanup( entry );
+ return -ENOMEM;
+}
+
+int drm_sg_free( 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 (!drm_core_check_feature(dev, DRIVER_SG))
+ return -EINVAL;
+
+ if ( copy_from_user( &request,
+ (drm_scatter_gather_t __user *)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_cleanup( entry );
+
+ return 0;
+}
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