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/* $OpenBSD: drm_scatter.c,v 1.15 2011/06/02 18:22:00 weerd Exp $ */
/*-
* 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>
*
*/
/*
* 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 "drmP.h"
void
drm_sg_cleanup(struct drm_device *dev, struct drm_sg_mem *entry)
{
if (entry == NULL)
return;
drm_dmamem_free(dev->dmat, entry->mem);
drm_free(entry);
}
int
drm_sg_alloc(struct drm_device * dev, struct drm_scatter_gather *request)
{
struct drm_sg_mem *entry;
bus_size_t size;
unsigned long pages;
if (dev->sg != NULL)
return (EINVAL);
entry = drm_calloc(1, sizeof(*entry));
if (entry == NULL)
return (ENOMEM);
pages = round_page(request->size) / PAGE_SIZE;
size = pages << PAGE_SHIFT;
DRM_DEBUG("sg size=%ld pages=%ld\n", request->size, pages);
if ((entry->mem = drm_dmamem_alloc(dev->dmat, size, PAGE_SIZE, pages,
PAGE_SIZE, 0, 0)) == NULL)
return (ENOMEM);
request->handle = entry->handle = (unsigned long)entry->mem->kva;
DRM_DEBUG("sg alloc handle = %08lx\n", entry->handle);
DRM_LOCK();
if (dev->sg) {
DRM_UNLOCK();
drm_sg_cleanup(dev, 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("\n");
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;
struct drm_sg_mem *entry;
DRM_LOCK();
entry = dev->sg;
dev->sg = NULL;
DRM_UNLOCK();
if (entry == NULL || entry->handle != request->handle)
return EINVAL;
DRM_DEBUG("sg free virtual = 0x%lx\n", entry->handle);
drm_sg_cleanup(dev, entry);
return 0;
}
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