mirror of
https://github.com/freebsd/freebsd-src
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135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/*-
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* Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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/** @file drm_scatter.c
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* Allocation of memory for scatter-gather mappings by the graphics chip.
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* The memory allocated here is then made into an aperture in the card
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* by mapping the pages into the GART.
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*/
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#include <dev/drm2/drmP.h>
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#define DEBUG_SCATTER 0
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static inline void *drm_vmalloc_dma(vm_size_t size)
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{
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return kmem_alloc_attr(size, M_NOWAIT | M_ZERO, 0,
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BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
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}
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void drm_sg_cleanup(struct drm_sg_mem * entry)
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{
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if (entry == NULL)
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return;
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if (entry->vaddr != NULL)
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kmem_free(entry->vaddr, IDX_TO_OFF(entry->pages));
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free(entry->busaddr, DRM_MEM_SGLISTS);
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free(entry, DRM_MEM_DRIVER);
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}
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int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
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{
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struct drm_sg_mem *entry;
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vm_size_t size;
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vm_pindex_t pindex;
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DRM_DEBUG("\n");
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EINVAL;
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if (dev->sg)
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return -EINVAL;
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entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
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if (!entry)
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return -ENOMEM;
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DRM_DEBUG("request size=%ld\n", request->size);
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size = round_page(request->size);
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entry->pages = atop(size);
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entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
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DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO);
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if (!entry->busaddr) {
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free(entry, DRM_MEM_DRIVER);
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return -ENOMEM;
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}
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entry->vaddr = drm_vmalloc_dma(size);
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if (entry->vaddr == NULL) {
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free(entry->busaddr, DRM_MEM_DRIVER);
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free(entry, DRM_MEM_DRIVER);
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return -ENOMEM;
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}
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for (pindex = 0; pindex < entry->pages; pindex++) {
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entry->busaddr[pindex] =
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vtophys((uintptr_t)entry->vaddr + IDX_TO_OFF(pindex));
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}
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request->handle = (uintptr_t)entry->vaddr;
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dev->sg = entry;
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DRM_DEBUG("allocated %ju pages @ %p, contents=%08lx\n",
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entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
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return 0;
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}
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int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_scatter_gather *request = data;
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return drm_sg_alloc(dev, request);
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}
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int drm_sg_free(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_scatter_gather *request = data;
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struct drm_sg_mem *entry;
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if (!drm_core_check_feature(dev, DRIVER_SG))
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return -EINVAL;
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entry = dev->sg;
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dev->sg = NULL;
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if (!entry || (uintptr_t)entry->vaddr != request->handle)
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return -EINVAL;
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DRM_DEBUG("free %p\n", entry->vaddr);
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drm_sg_cleanup(entry);
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return 0;
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}
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