freebsd-dev/sys/dev/drm2/drm_scatter.c
Konstantin Belousov e27f871969 Add the code for new Intel GPU driver, which supports GEM, KMS and
works with new generations of GPUs (IronLake, SandyBridge and
supposedly IvyBridge).

The driver is not connected to the build yet.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2012-05-22 11:07:44 +00:00

130 lines
3.4 KiB
C

/*-
* Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
* 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.
*/
#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 mapping the pages into the GART.
*/
#include <dev/drm2/drmP.h>
int
drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
{
struct drm_sg_mem *entry;
vm_size_t size;
vm_pindex_t pindex;
if (dev->sg)
return EINVAL;
DRM_DEBUG("request size=%ld\n", request->size);
entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
size = round_page(request->size);
entry->pages = OFF_TO_IDX(size);
entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
DRM_MEM_SGLISTS, M_WAITOK | M_ZERO);
entry->vaddr = kmem_alloc_attr(kernel_map, size, M_WAITOK | M_ZERO,
0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
if (entry->vaddr == 0) {
drm_sg_cleanup(entry);
return (ENOMEM);
}
for(pindex = 0; pindex < entry->pages; pindex++) {
entry->busaddr[pindex] =
vtophys(entry->vaddr + IDX_TO_OFF(pindex));
}
DRM_LOCK(dev);
if (dev->sg) {
DRM_UNLOCK(dev);
drm_sg_cleanup(entry);
return (EINVAL);
}
dev->sg = entry;
DRM_UNLOCK(dev);
request->handle = entry->vaddr;
DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n",
entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
return (0);
}
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)
{
if (entry == NULL)
return;
if (entry->vaddr != 0)
kmem_free(kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages));
free(entry->busaddr, DRM_MEM_SGLISTS);
free(entry, DRM_MEM_DRIVER);
return;
}
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(dev);
entry = dev->sg;
dev->sg = NULL;
DRM_UNLOCK(dev);
if (!entry || entry->vaddr != request->handle)
return (EINVAL);
DRM_DEBUG("free 0x%zx\n", entry->vaddr);
drm_sg_cleanup(entry);
return (0);
}