131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*-
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Gareth Hughes <gareth@valinux.com>
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* Eric Anholt <anholt@FreeBSD.org>
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*
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*/
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/** @file drm_scatter.c
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* Allocation of memory for scatter-gather mappings by the graphics chip.
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*
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* The memory allocated here is then made into an aperture in the card
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* by drm_ati_pcigart_init().
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*/
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#include "drmP.h"
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#define DEBUG_SCATTER 0
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void drm_sg_cleanup(drm_sg_mem_t *entry)
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{
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free((void *)entry->handle, M_DRM);
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free(entry->busaddr, M_DRM);
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free(entry, M_DRM);
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}
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int drm_sg_alloc(drm_device_t * dev, drm_scatter_gather_t * request)
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{
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drm_sg_mem_t *entry;
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unsigned long pages;
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int i;
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if ( dev->sg )
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return EINVAL;
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entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
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if ( !entry )
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return ENOMEM;
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pages = round_page(request->size) / PAGE_SIZE;
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DRM_DEBUG( "sg size=%ld pages=%ld\n", request->size, pages );
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entry->pages = pages;
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entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
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M_WAITOK | M_ZERO);
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if ( !entry->busaddr ) {
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drm_sg_cleanup(entry);
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return ENOMEM;
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}
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entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
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M_WAITOK | M_ZERO);
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if (entry->handle == 0) {
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drm_sg_cleanup(entry);
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return ENOMEM;
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}
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for (i = 0; i < pages; i++) {
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entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
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}
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DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle );
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entry->virtual = (void *)entry->handle;
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request->handle = entry->handle;
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DRM_LOCK();
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if (dev->sg) {
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DRM_UNLOCK();
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drm_sg_cleanup(entry);
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return EINVAL;
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}
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dev->sg = entry;
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DRM_UNLOCK();
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return 0;
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}
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int drm_sg_alloc_ioctl(drm_device_t *dev, void *data, struct drm_file *file_priv)
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{
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drm_scatter_gather_t *request = data;
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int ret;
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DRM_DEBUG( "%s\n", __FUNCTION__ );
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ret = drm_sg_alloc(dev, request);
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return ret;
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}
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int drm_sg_free(drm_device_t *dev, void *data, struct drm_file *file_priv)
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{
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drm_scatter_gather_t *request = data;
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drm_sg_mem_t *entry;
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DRM_LOCK();
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entry = dev->sg;
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dev->sg = NULL;
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DRM_UNLOCK();
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if ( !entry || entry->handle != request->handle )
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return EINVAL;
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DRM_DEBUG( "sg free virtual = 0x%lx\n", entry->handle );
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drm_sg_cleanup(entry);
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return 0;
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}
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