mirror of
https://github.com/Stichting-MINIX-Research-Foundation/netbsd.git
synced 2025-08-10 14:39:47 -04:00
238 lines
6.4 KiB
C
238 lines
6.4 KiB
C
/* $NetBSD: drm_scatter.c,v 1.3 2014/07/16 20:56:25 riastradh Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2013 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Taylor R. Campbell.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: drm_scatter.c,v 1.3 2014/07/16 20:56:25 riastradh Exp $");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <drm/drmP.h>
|
|
|
|
static int drm_sg_alloc_mem(struct drm_device *, size_t,
|
|
struct drm_sg_mem **);
|
|
static void drm_sg_free_mem(struct drm_device *, struct drm_sg_mem *);
|
|
|
|
int
|
|
drm_sg_alloc(struct drm_device *dev, void *data,
|
|
struct drm_file *file __unused)
|
|
{
|
|
struct drm_scatter_gather *const request = data;
|
|
struct drm_sg_mem *sg;
|
|
int error;
|
|
|
|
/*
|
|
* XXX Should not hold this mutex during drm_sg_alloc. For
|
|
* now, we'll just use non-blocking allocations.
|
|
*/
|
|
KASSERT(mutex_is_locked(&drm_global_mutex));
|
|
|
|
/*
|
|
* Sanity-check the inputs.
|
|
*/
|
|
if (!drm_core_check_feature(dev, DRIVER_SG))
|
|
return -ENODEV;
|
|
if (dev->sg != NULL)
|
|
return -EBUSY;
|
|
if (request->size > 0xffffffffUL)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Do the allocation.
|
|
*
|
|
* XXX Would it be safe to drop drm_global_mutex here to avoid
|
|
* holding it during allocation?
|
|
*/
|
|
error = drm_sg_alloc_mem(dev, request->size, &sg);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Set it up to be the device's scatter-gather memory. */
|
|
dev->sg = sg;
|
|
|
|
/* Success! */
|
|
request->handle = sg->handle;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file)
|
|
{
|
|
struct drm_scatter_gather *const request = data;
|
|
struct drm_sg_mem *sg;
|
|
|
|
KASSERT(mutex_is_locked(&drm_global_mutex));
|
|
|
|
/*
|
|
* Sanity-check the inputs.
|
|
*/
|
|
if (!drm_core_check_feature(dev, DRIVER_SG))
|
|
return -ENODEV;
|
|
|
|
sg = dev->sg;
|
|
if (sg == NULL)
|
|
return -ENXIO;
|
|
if (sg->handle != request->handle)
|
|
return -EINVAL;
|
|
|
|
/* Remove dev->sg. */
|
|
dev->sg = NULL;
|
|
|
|
/* Free it. */
|
|
drm_sg_free_mem(dev, sg);
|
|
|
|
/* Success! */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
drm_legacy_sg_cleanup(struct drm_device *dev)
|
|
{
|
|
|
|
if (!drm_core_check_feature(dev, DRIVER_SG))
|
|
return;
|
|
if (dev->sg == NULL)
|
|
return;
|
|
if (drm_core_check_feature(dev, DRIVER_MODESET))
|
|
return;
|
|
|
|
drm_sg_free_mem(dev, dev->sg);
|
|
}
|
|
|
|
static int
|
|
drm_sg_alloc_mem(struct drm_device *dev, size_t size, struct drm_sg_mem **sgp)
|
|
{
|
|
int nsegs;
|
|
int error;
|
|
|
|
KASSERT(drm_core_check_feature(dev, DRIVER_SG));
|
|
|
|
KASSERT(size <= (size_t)0xffffffffUL); /* XXX 32-bit sizes only? */
|
|
const size_t nbytes = PAGE_ALIGN(size);
|
|
const size_t npages = nbytes >> PAGE_SHIFT;
|
|
KASSERT(npages <= (size_t)INT_MAX);
|
|
|
|
/*
|
|
* Allocate a drm_sg_mem record.
|
|
*/
|
|
struct drm_sg_mem *const sg =
|
|
kmem_zalloc(offsetof(struct drm_sg_mem, sg_segs[npages]),
|
|
KM_NOSLEEP);
|
|
if (sg == NULL)
|
|
return -ENOMEM;
|
|
sg->sg_tag = dev->dmat;
|
|
sg->sg_nsegs_max = (unsigned int)npages;
|
|
|
|
/*
|
|
* Allocate the requested amount of DMA-safe memory.
|
|
*/
|
|
KASSERT(sg->sg_nsegs_max <= (unsigned int)INT_MAX);
|
|
/* XXX errno NetBSD->Linux */
|
|
error = -bus_dmamem_alloc(sg->sg_tag, nbytes, PAGE_SIZE, 0,
|
|
sg->sg_segs, (int)sg->sg_nsegs_max, &nsegs, BUS_DMA_NOWAIT);
|
|
if (error)
|
|
goto fail0;
|
|
KASSERT(0 <= nsegs);
|
|
sg->sg_nsegs = (unsigned int)nsegs;
|
|
|
|
/*
|
|
* XXX Old drm passed DRM_BUS_NOWAIT below but BUS_DMA_WAITOK
|
|
* above. WTF?
|
|
*/
|
|
|
|
/*
|
|
* Map the DMA-safe memory into kernel virtual address space.
|
|
*/
|
|
/* XXX errno NetBSD->Linux */
|
|
error = -bus_dmamem_map(sg->sg_tag, sg->sg_segs, nsegs, nbytes,
|
|
&sg->virtual,
|
|
(BUS_DMA_NOWAIT | BUS_DMA_COHERENT | BUS_DMA_NOCACHE));
|
|
if (error)
|
|
goto fail1;
|
|
sg->sg_size = nbytes;
|
|
|
|
/*
|
|
* Create a map for DMA transfers.
|
|
*/
|
|
/* XXX errno NetBSD->Linux */
|
|
error = -bus_dmamap_create(sg->sg_tag, nbytes, nsegs, nbytes, 0,
|
|
BUS_DMA_NOWAIT, &sg->sg_map);
|
|
if (error)
|
|
goto fail2;
|
|
|
|
/*
|
|
* Load the kva buffer into the map for DMA transfers.
|
|
*/
|
|
/* XXX errno NetBSD->Linux */
|
|
error = -bus_dmamap_load(sg->sg_tag, sg->sg_map, sg->virtual, nbytes,
|
|
NULL, (BUS_DMA_NOWAIT | BUS_DMA_NOCACHE));
|
|
if (error)
|
|
goto fail3;
|
|
|
|
/*
|
|
* Use the kernel virtual address as the userland handle.
|
|
*
|
|
* XXX This leaks some information about kernel virtual
|
|
* addresses to userland; should we use an idr instead?
|
|
*/
|
|
sg->handle = (unsigned long)(uintptr_t)sg->virtual;
|
|
KASSERT(sg->virtual == (void *)(uintptr_t)sg->handle);
|
|
|
|
/* Success! */
|
|
*sgp = sg;
|
|
return 0;
|
|
|
|
fail3: bus_dmamap_destroy(sg->sg_tag, sg->sg_map);
|
|
fail2: bus_dmamem_unmap(sg->sg_tag, sg->virtual, sg->sg_size);
|
|
fail1: KASSERT(sg->sg_nsegs <= (unsigned int)INT_MAX);
|
|
bus_dmamem_free(sg->sg_tag, sg->sg_segs, (int)sg->sg_nsegs);
|
|
fail0: sg->sg_tag = NULL; /* XXX paranoia */
|
|
kmem_free(sg, offsetof(struct drm_sg_mem, sg_segs[sg->sg_nsegs_max]));
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
drm_sg_free_mem(struct drm_device *dev, struct drm_sg_mem *sg)
|
|
{
|
|
|
|
bus_dmamap_unload(sg->sg_tag, sg->sg_map);
|
|
bus_dmamap_destroy(sg->sg_tag, sg->sg_map);
|
|
bus_dmamem_unmap(sg->sg_tag, sg->virtual, sg->sg_size);
|
|
KASSERT(sg->sg_nsegs <= (unsigned int)INT_MAX);
|
|
bus_dmamem_free(sg->sg_tag, sg->sg_segs, (int)sg->sg_nsegs);
|
|
sg->sg_tag = NULL; /* XXX paranoia */
|
|
kmem_free(sg, offsetof(struct drm_sg_mem, sg_segs[sg->sg_nsegs_max]));
|
|
}
|