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/*-
* 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>
*
*/
/** @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 "drmP.h"
#define DEBUG_SCATTER 0
struct drm_sg_dmamem *drm_sg_dmamem_alloc(drm_device_t *, size_t);
void drm_sg_dmamem_free(struct drm_sg_dmamem *);
void
drm_sg_cleanup(drm_sg_mem_t *entry)
{
if (entry) {
#ifdef __OpenBSD__
if (entry->mem)
drm_sg_dmamem_free(entry->mem);
#else
if (entry->handle)
free((void *)entry->handle, M_DRM);
#endif
if (entry->busaddr)
free(entry->busaddr, M_DRM);
free(entry, M_DRM);
}
}
int
drm_sg_alloc(drm_device_t * dev, drm_scatter_gather_t * 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;
}
#ifdef __OpenBSD__
if ((entry->mem = drm_sg_dmamem_alloc(dev, pages)) == NULL) {
drm_sg_cleanup(entry);
return ENOMEM;
}
entry->handle = (unsigned long)entry->mem->sg_kva;
for (i = 0; i < pages; i++)
entry->busaddr[i] = entry->mem->sg_map->dm_segs[i].ds_addr;
#else
entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
M_WAITOK | M_ZERO);
if (entry->handle == NULL) {
drm_sg_cleanup(entry);
return ENOMEM;
}
for (i = 0; i < pages; i++) {
entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
}
#endif
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(drm_device_t *dev, void *data, struct drm_file *file_priv)
{
drm_scatter_gather_t *request = data;
int ret;
DRM_DEBUG( "%s\n", __FUNCTION__ );
ret = drm_sg_alloc(dev, request);
return ret;
}
int
drm_sg_free(drm_device_t *dev, void *data, struct drm_file *file_priv)
{
drm_scatter_gather_t *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;
}
/*
* allocate `pages' pages of dma memory for use in
* scatter/gather
*/
struct drm_sg_dmamem*
drm_sg_dmamem_alloc(drm_device_t *dev, size_t pages)
{
struct drm_sg_dmamem *dsd = NULL;
bus_size_t size = pages << PAGE_SHIFT;
int ret = 0;
dsd = malloc(sizeof(*dsd), M_DRM, M_NOWAIT | M_ZERO);
if (dsd == NULL)
return (NULL);
dsd->sg_segs = malloc(sizeof(*dsd->sg_segs) * pages, M_DRM,
M_NOWAIT | M_ZERO);
if (dsd->sg_segs == NULL)
goto dsdfree;
dsd->sg_tag = dev->pa.pa_dmat;
dsd->sg_size = size;
if (bus_dmamap_create(dev->pa.pa_dmat, size, pages, PAGE_SIZE, 0,
BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &dsd->sg_map) != 0)
goto segsfree;
if ((ret = bus_dmamem_alloc(dev->pa.pa_dmat, size, PAGE_SIZE, 0,
dsd->sg_segs, pages, &dsd->sg_nsegs, BUS_DMA_NOWAIT)) != 0) {
printf("alloc failed, value= %d\n",ret);
goto destroy;
}
if (bus_dmamem_map(dev->pa.pa_dmat, dsd->sg_segs, dsd->sg_nsegs, size,
&dsd->sg_kva, BUS_DMA_NOWAIT) != 0)
goto free;
if (bus_dmamap_load(dev->pa.pa_dmat, dsd->sg_map, dsd->sg_kva, size,
NULL, BUS_DMA_NOWAIT) != 0)
goto unmap;
bzero(dsd->sg_kva, size);
return (dsd);
unmap:
bus_dmamem_unmap(dev->pa.pa_dmat, dsd->sg_kva, size);
free:
bus_dmamem_free(dev->pa.pa_dmat, dsd->sg_segs, dsd->sg_nsegs);
destroy:
bus_dmamap_destroy(dev->pa.pa_dmat, dsd->sg_map);
segsfree:
free(dsd->sg_segs, M_DRM);
dsdfree:
free(dsd, M_DRM);
return (NULL);
}
void
drm_sg_dmamem_free(struct drm_sg_dmamem *mem)
{
bus_dmamap_unload(mem->sg_tag, mem->sg_map);
bus_dmamem_unmap(mem->sg_tag, mem->sg_kva, mem->sg_size);
bus_dmamem_free(mem->sg_tag, mem->sg_segs, mem->sg_nsegs);
bus_dmamap_destroy(mem->sg_tag, mem->sg_map);
free(mem->sg_segs, M_DRM);
free(mem, M_DRM);
}
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