freebsd-skq/sys/dev/drm/drm_scatter.c
rnoland 3e6eb1349a rework drm_scatter.c which allocates scatter / gather pages for use by
ati pci gart to use bus_dma to handle the allocations.  This fixes
a garbled screen issue on at least some radeons (X1400 tested).  It is
also likely that this is the correct fix for PR# 119324, though that
is not confirmed yet.

Reviewed by:	jhb@ (mentor, prior version)
Approved by:	kib@
MFC after:	2 weeks
2008-12-18 21:04:50 +00:00

193 lines
5.0 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"
static void drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs,
int nsegs, int error);
int
drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
{
struct drm_sg_mem *entry;
struct drm_dma_handle *dmah;
unsigned long pages;
int ret;
if (dev->sg)
return EINVAL;
entry = malloc(sizeof(*entry), DRM_MEM_SGLISTS, 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), DRM_MEM_PAGES,
M_WAITOK | M_ZERO);
if (!entry->busaddr) {
free(entry, DRM_MEM_SGLISTS);
return ENOMEM;
}
dmah = malloc(sizeof(struct drm_dma_handle), DRM_MEM_DMA,
M_ZERO | M_NOWAIT);
if (dmah == NULL) {
free(entry->busaddr, DRM_MEM_PAGES);
free(entry, DRM_MEM_SGLISTS);
return ENOMEM;
}
ret = bus_dma_tag_create(NULL, PAGE_SIZE, 0, /* tag, align, boundary */
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
NULL, NULL, /* filtfunc, filtfuncargs */
request->size, pages, /* maxsize, nsegs */
PAGE_SIZE, 0, /* maxsegsize, flags */
NULL, NULL, /* lockfunc, lockfuncargs */
&dmah->tag);
if (ret != 0) {
free(dmah, DRM_MEM_DMA);
free(entry->busaddr, DRM_MEM_PAGES);
free(entry, DRM_MEM_SGLISTS);
return ENOMEM;
}
ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
BUS_DMA_NOWAIT | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
if (ret != 0) {
bus_dma_tag_destroy(dmah->tag);
free(dmah, DRM_MEM_DMA);
free(entry->busaddr, DRM_MEM_PAGES);
free(entry, DRM_MEM_SGLISTS);
return ENOMEM;
}
ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr,
request->size, drm_sg_alloc_cb, entry, 0);
if (ret != 0) {
bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
bus_dma_tag_destroy(dmah->tag);
free(dmah, DRM_MEM_DMA);
free(entry->busaddr, DRM_MEM_PAGES);
free(entry, DRM_MEM_SGLISTS);
return ENOMEM;
}
entry->sg_dmah = dmah;
entry->handle = (unsigned long)dmah->vaddr;
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;
}
static void
drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
struct drm_sg_mem *entry = arg;
int i;
if (error != 0)
return;
for(i = 0 ; i < nsegs ; i++) {
entry->busaddr[i] = segs[i].ds_addr;
}
}
int
drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_scatter_gather *request = data;
DRM_DEBUG("\n");
return drm_sg_alloc(dev, request);
}
void
drm_sg_cleanup(struct drm_sg_mem *entry)
{
struct drm_dma_handle *dmah = entry->sg_dmah;
bus_dmamap_unload(dmah->tag, dmah->map);
bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
bus_dma_tag_destroy(dmah->tag);
free(dmah, DRM_MEM_DMA);
free(entry->busaddr, DRM_MEM_PAGES);
free(entry, DRM_MEM_SGLISTS);
}
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 || entry->handle != request->handle)
return EINVAL;
DRM_DEBUG("sg free virtual = 0x%lx\n", entry->handle);
drm_sg_cleanup(entry);
return 0;
}