ae526637c4
Revert r338177, r338176, r338175, r338174, r338172 After long consultations with re@, core members and mmacy, revert these changes. Followup changes will be made to mark them as deprecated and prent a message about where to find the up-to-date driver. Followup commits will be made to make this clear in the installer. Followup commits to reduce POLA in ways we're still exploring. It's anticipated that after the freeze, this will be removed in 13-current (with the residual of the drm2 code copied to sys/arm/dev/drm2 for the TEGRA port's use w/o the intel or radeon drivers). Due to the impending freeze, there was no formal core vote for this. I've been talking to different core members all day, as well as Matt Macey and Glen Barber. Nobody is completely happy, all are grudgingly going along with this. Work is in progress to mitigate the negative effects as much as possible. Requested by: re@ (gjb, rgrimes)
130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/*-
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* Copyright 2003 Eric Anholt.
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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 THE
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* AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/**
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* \file drm_pci.h
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* \brief PCI consistent, DMA-accessible memory allocation.
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*
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* \author Eric Anholt <anholt@FreeBSD.org>
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*/
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#include "dev/drm/drmP.h"
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/**********************************************************************/
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/** \name PCI memory */
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/*@{*/
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static void
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drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
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{
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drm_dma_handle_t *dmah = arg;
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if (error != 0)
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return;
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KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
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dmah->busaddr = segs[0].ds_addr;
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}
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/**
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* \brief Allocate a physically contiguous DMA-accessible consistent
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* memory block.
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*/
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drm_dma_handle_t *
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drm_pci_alloc(struct drm_device *dev, size_t size,
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size_t align, dma_addr_t maxaddr)
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{
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drm_dma_handle_t *dmah;
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int ret;
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/* Need power-of-two alignment, so fail the allocation if it isn't. */
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if ((align & (align - 1)) != 0) {
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DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
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(int)align);
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return NULL;
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}
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dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT);
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if (dmah == NULL)
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return NULL;
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/* Make sure we aren't holding locks here */
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mtx_assert(&dev->dev_lock, MA_NOTOWNED);
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if (mtx_owned(&dev->dev_lock))
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DRM_ERROR("called while holding dev_lock\n");
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mtx_assert(&dev->dma_lock, MA_NOTOWNED);
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if (mtx_owned(&dev->dma_lock))
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DRM_ERROR("called while holding dma_lock\n");
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ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */
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maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
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NULL, NULL, /* filtfunc, filtfuncargs */
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size, 1, size, /* maxsize, nsegs, maxsegsize */
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0, NULL, NULL, /* flags, lockfunc, lockfuncargs */
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&dmah->tag);
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if (ret != 0) {
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free(dmah, DRM_MEM_DMA);
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return NULL;
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}
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ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
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BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
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if (ret != 0) {
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bus_dma_tag_destroy(dmah->tag);
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free(dmah, DRM_MEM_DMA);
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return NULL;
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}
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ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
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drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT);
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if (ret != 0) {
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bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
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bus_dma_tag_destroy(dmah->tag);
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free(dmah, DRM_MEM_DMA);
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return NULL;
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}
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return dmah;
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}
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/**
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* \brief Free a DMA-accessible consistent memory block.
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*/
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void
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drm_pci_free(struct drm_device *dev, drm_dma_handle_t *dmah)
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{
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if (dmah == NULL)
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return;
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bus_dmamap_unload(dmah->tag, dmah->map);
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bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
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bus_dma_tag_destroy(dmah->tag);
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free(dmah, DRM_MEM_DMA);
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}
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/*@}*/
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