1235783Skib/*- 2235783Skib * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org> 3235783Skib * All Rights Reserved. 4235783Skib * 5235783Skib * Permission is hereby granted, free of charge, to any person obtaining a 6235783Skib * copy of this software and associated documentation files (the "Software"), 7235783Skib * to deal in the Software without restriction, including without limitation 8235783Skib * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9235783Skib * and/or sell copies of the Software, and to permit persons to whom the 10235783Skib * Software is furnished to do so, subject to the following conditions: 11235783Skib * 12235783Skib * The above copyright notice and this permission notice (including the next 13235783Skib * paragraph) shall be included in all copies or substantial portions of the 14235783Skib * Software. 15235783Skib * 16235783Skib * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17235783Skib * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18235783Skib * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19235783Skib * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 20235783Skib * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21235783Skib * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22235783Skib * DEALINGS IN THE SOFTWARE. 23235783Skib */ 24235783Skib 25235783Skib#include <sys/cdefs.h> 26235783Skib__FBSDID("$FreeBSD$"); 27235783Skib 28235783Skib/** @file drm_scatter.c 29235783Skib * Allocation of memory for scatter-gather mappings by the graphics chip. 30235783Skib * The memory allocated here is then made into an aperture in the card 31235783Skib * by mapping the pages into the GART. 32235783Skib */ 33235783Skib 34235783Skib#include <dev/drm2/drmP.h> 35235783Skib 36235783Skibint 37235783Skibdrm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request) 38235783Skib{ 39235783Skib struct drm_sg_mem *entry; 40235783Skib vm_size_t size; 41235783Skib vm_pindex_t pindex; 42235783Skib 43235783Skib if (dev->sg) 44235783Skib return EINVAL; 45235783Skib 46235783Skib DRM_DEBUG("request size=%ld\n", request->size); 47235783Skib 48235783Skib entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_WAITOK | M_ZERO); 49235783Skib 50235783Skib size = round_page(request->size); 51235783Skib entry->pages = OFF_TO_IDX(size); 52235783Skib entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr), 53235783Skib DRM_MEM_SGLISTS, M_WAITOK | M_ZERO); 54235783Skib 55254025Sjeff entry->vaddr = kmem_alloc_attr(kernel_arena, size, M_WAITOK | M_ZERO, 56235783Skib 0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING); 57235783Skib if (entry->vaddr == 0) { 58235783Skib drm_sg_cleanup(entry); 59235783Skib return (ENOMEM); 60235783Skib } 61235783Skib 62235783Skib for(pindex = 0; pindex < entry->pages; pindex++) { 63235783Skib entry->busaddr[pindex] = 64235783Skib vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 65235783Skib } 66235783Skib 67235783Skib DRM_LOCK(dev); 68235783Skib if (dev->sg) { 69235783Skib DRM_UNLOCK(dev); 70235783Skib drm_sg_cleanup(entry); 71235783Skib return (EINVAL); 72235783Skib } 73235783Skib dev->sg = entry; 74235783Skib DRM_UNLOCK(dev); 75235783Skib 76235783Skib request->handle = entry->vaddr; 77235783Skib 78235783Skib DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n", 79235783Skib entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr); 80235783Skib 81235783Skib return (0); 82235783Skib} 83235783Skib 84235783Skibint 85235783Skibdrm_sg_alloc_ioctl(struct drm_device *dev, void *data, 86235783Skib struct drm_file *file_priv) 87235783Skib{ 88235783Skib struct drm_scatter_gather *request = data; 89235783Skib 90235783Skib DRM_DEBUG("\n"); 91235783Skib 92235783Skib return (drm_sg_alloc(dev, request)); 93235783Skib} 94235783Skib 95235783Skibvoid 96235783Skibdrm_sg_cleanup(struct drm_sg_mem *entry) 97235783Skib{ 98235783Skib if (entry == NULL) 99235783Skib return; 100235783Skib 101235783Skib if (entry->vaddr != 0) 102254025Sjeff kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages)); 103235783Skib 104235783Skib free(entry->busaddr, DRM_MEM_SGLISTS); 105235783Skib free(entry, DRM_MEM_DRIVER); 106235783Skib 107235783Skib return; 108235783Skib} 109235783Skib 110235783Skibint 111235783Skibdrm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv) 112235783Skib{ 113235783Skib struct drm_scatter_gather *request = data; 114235783Skib struct drm_sg_mem *entry; 115235783Skib 116235783Skib DRM_LOCK(dev); 117235783Skib entry = dev->sg; 118235783Skib dev->sg = NULL; 119235783Skib DRM_UNLOCK(dev); 120235783Skib 121235783Skib if (!entry || entry->vaddr != request->handle) 122235783Skib return (EINVAL); 123235783Skib 124235783Skib DRM_DEBUG("free 0x%zx\n", entry->vaddr); 125235783Skib 126235783Skib drm_sg_cleanup(entry); 127235783Skib 128235783Skib return (0); 129235783Skib} 130