freebsd-dev/sys/dev/drm2/drm_scatter.c
Alan Cox 49bfa624ac Eliminate the arena parameter to kmem_free(). Implicitly this corrects an
error in the function hypercall_memfree(), where the wrong arena was being
passed to kmem_free().

Introduce a per-page flag, VPO_KMEM_EXEC, to mark physical pages that are
mapped in kmem with execute permissions.  Use this flag to determine which
arena the kmem virtual addresses are returned to.

Eliminate UMA_SLAB_KRWX.  The introduction of VPO_KMEM_EXEC makes it
redundant.

Update the nearby comment for UMA_SLAB_KERNEL.

Reviewed by:	kib, markj
Discussed with:	jeff
Approved by:	re (marius)
Differential Revision:	https://reviews.freebsd.org/D16845
2018-08-25 19:38:08 +00:00

137 lines
3.6 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>
#define DEBUG_SCATTER 0
static inline vm_offset_t drm_vmalloc_dma(vm_size_t size)
{
return kmem_alloc_attr(size, M_NOWAIT | M_ZERO, 0,
BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
}
void drm_sg_cleanup(struct drm_sg_mem * entry)
{
if (entry == NULL)
return;
if (entry->vaddr != 0)
kmem_free(entry->vaddr, IDX_TO_OFF(entry->pages));
free(entry->busaddr, DRM_MEM_SGLISTS);
free(entry, DRM_MEM_DRIVER);
}
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;
DRM_DEBUG("\n");
if (!drm_core_check_feature(dev, DRIVER_SG))
return -EINVAL;
if (dev->sg)
return -EINVAL;
entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
if (!entry)
return -ENOMEM;
DRM_DEBUG("request size=%ld\n", request->size);
size = round_page(request->size);
entry->pages = atop(size);
entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO);
if (!entry->busaddr) {
free(entry, DRM_MEM_DRIVER);
return -ENOMEM;
}
entry->vaddr = drm_vmalloc_dma(size);
if (entry->vaddr == 0) {
free(entry->busaddr, DRM_MEM_DRIVER);
free(entry, DRM_MEM_DRIVER);
return -ENOMEM;
}
for (pindex = 0; pindex < entry->pages; pindex++) {
entry->busaddr[pindex] =
vtophys(entry->vaddr + IDX_TO_OFF(pindex));
}
request->handle = entry->vaddr;
dev->sg = entry;
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;
return drm_sg_alloc(dev, request);
}
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;
if (!drm_core_check_feature(dev, DRIVER_SG))
return -EINVAL;
entry = dev->sg;
dev->sg = NULL;
if (!entry || entry->vaddr != request->handle)
return -EINVAL;
DRM_DEBUG("free 0x%zx\n", entry->vaddr);
drm_sg_cleanup(entry);
return 0;
}