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authorJose Fonseca <jrfonseca@users.sourceforge.net>2003-06-03 23:27:01 +0000
committerJose Fonseca <jrfonseca@users.sourceforge.net>2003-06-03 23:27:01 +0000
commit6611a5fb7f41f81e38391c77903d98a29937ceed (patch)
tree94f89336a8e7c0a8eb08b2c20b0c0a1eb0464a7d /linux/drm_sg_tmp.h
parenta709d4c97c2de9d75ba845da41d61f8734ee573b (diff)
Split declarations/definitions in drm_scatter.h into drm_sg.h/drm_sg_tmp.h
respectively. Splited the work out of the ioctls and renamed (with the _ioctl prefix). Added some more documentation. Did the same for drm_sgpsupport.h.
Diffstat (limited to 'linux/drm_sg_tmp.h')
-rw-r--r--linux/drm_sg_tmp.h309
1 files changed, 309 insertions, 0 deletions
diff --git a/linux/drm_sg_tmp.h b/linux/drm_sg_tmp.h
new file mode 100644
index 00000000..95cb1fc7
--- /dev/null
+++ b/linux/drm_sg_tmp.h
@@ -0,0 +1,309 @@
+/**
+ * \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