freebsd-dev/sys/dev/drm/drm_scatter.c
Robert Noland 4cd2e9581f resync to git master
This reverts a private patch which is causing issues with many Intel chipsets.
I will review that patch and see what we need to do to fix it up later, but
for the time being, we will just get these chips working again.

This update contains a lot of code cleanup and is post gem merge
(no, we don't have gem support).  It should prove much easier to read the
code now.  A lot of thanks goes to vehemens for that work.  I have adapted
the code to use cdevpriv for tracking per open file data.  That alleviates
the old ugly hack that we used to try and accomplish the task and helped to
clean up the open / close behavior a good bit.  This also replaces the hack
that was put in place a year or so ago to prevent radeons from locking up
with AIGLX enabled.  I have had a couple of radeon testers report that it
still works as expected, though I no longer have radeon hardware to test with
myself.  Other various fixes from the linux crew and Intel, many of
which are muddled in with the gem merge.

Approved by:	jhb (mentor)
Obtained from:	mesa/drm git master
MFC after:	2 weeks
2008-10-03 16:59:11 +00:00

135 lines
3.4 KiB
C

/*-
* 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.
*
* Authors:
* Gareth Hughes <gareth@valinux.com>
* Eric Anholt <anholt@FreeBSD.org>
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/** @file drm_scatter.c
* Allocation of memory for scatter-gather mappings by the graphics chip.
*
* The memory allocated here is then made into an aperture in the card
* by drm_ati_pcigart_init().
*/
#include "dev/drm/drmP.h"
#define DEBUG_SCATTER 0
void drm_sg_cleanup(drm_sg_mem_t *entry)
{
free((void *)entry->handle, M_DRM);
free(entry->busaddr, M_DRM);
free(entry, M_DRM);
}
int drm_sg_alloc(struct drm_device * dev, struct drm_scatter_gather * request)
{
drm_sg_mem_t *entry;
unsigned long pages;
int i;
if (dev->sg)
return EINVAL;
entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
if (!entry)
return ENOMEM;
pages = round_page(request->size) / PAGE_SIZE;
DRM_DEBUG("sg size=%ld pages=%ld\n", request->size, pages);
entry->pages = pages;
entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
M_WAITOK | M_ZERO);
if (!entry->busaddr) {
drm_sg_cleanup(entry);
return ENOMEM;
}
entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
M_WAITOK | M_ZERO);
if (entry->handle == 0) {
drm_sg_cleanup(entry);
return ENOMEM;
}
for (i = 0; i < pages; i++) {
entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
}
DRM_DEBUG("sg alloc handle = %08lx\n", entry->handle);
entry->virtual = (void *)entry->handle;
request->handle = entry->handle;
DRM_LOCK();
if (dev->sg) {
DRM_UNLOCK();
drm_sg_cleanup(entry);
return EINVAL;
}
dev->sg = entry;
DRM_UNLOCK();
return 0;
}
int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_scatter_gather *request = data;
int ret;
DRM_DEBUG("%s\n", __FUNCTION__);
ret = drm_sg_alloc(dev, request);
return ret;
}
int drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_scatter_gather *request = data;
drm_sg_mem_t *entry;
DRM_LOCK();
entry = dev->sg;
dev->sg = NULL;
DRM_UNLOCK();
if (!entry || entry->handle != request->handle)
return EINVAL;
DRM_DEBUG("sg free virtual = 0x%lx\n", entry->handle);
drm_sg_cleanup(entry);
return 0;
}