1145132Sanholt/*- 2207067Srnoland * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org> 3145132Sanholt * All Rights Reserved. 4145132Sanholt * 5145132Sanholt * Permission is hereby granted, free of charge, to any person obtaining a 6145132Sanholt * copy of this software and associated documentation files (the "Software"), 7145132Sanholt * to deal in the Software without restriction, including without limitation 8145132Sanholt * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9145132Sanholt * and/or sell copies of the Software, and to permit persons to whom the 10145132Sanholt * Software is furnished to do so, subject to the following conditions: 11145132Sanholt * 12145132Sanholt * The above copyright notice and this permission notice (including the next 13145132Sanholt * paragraph) shall be included in all copies or substantial portions of the 14145132Sanholt * Software. 15145132Sanholt * 16145132Sanholt * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17145132Sanholt * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18145132Sanholt * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19145132Sanholt * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 20145132Sanholt * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21145132Sanholt * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22145132Sanholt * DEALINGS IN THE SOFTWARE. 23145132Sanholt */ 24145132Sanholt 25152909Sanholt#include <sys/cdefs.h> 26152909Sanholt__FBSDID("$FreeBSD$"); 27152909Sanholt 28182080Srnoland/** @file drm_scatter.c 29182080Srnoland * Allocation of memory for scatter-gather mappings by the graphics chip. 30182080Srnoland * The memory allocated here is then made into an aperture in the card 31207067Srnoland * by mapping the pages into the GART. 32182080Srnoland */ 33182080Srnoland 34145132Sanholt#include "dev/drm/drmP.h" 35145132Sanholt 36186295Srnolandint 37186295Srnolanddrm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request) 38145132Sanholt{ 39186295Srnoland struct drm_sg_mem *entry; 40207067Srnoland vm_size_t size; 41207067Srnoland vm_pindex_t pindex; 42145132Sanholt 43183573Srnoland if (dev->sg) 44145132Sanholt return EINVAL; 45145132Sanholt 46207067Srnoland DRM_DEBUG("request size=%ld\n", request->size); 47145132Sanholt 48207067Srnoland entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_WAITOK | M_ZERO); 49207067Srnoland 50207067Srnoland size = round_page(request->size); 51207067Srnoland entry->pages = OFF_TO_IDX(size); 52198694Srnoland entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr), 53207067Srnoland DRM_MEM_SGLISTS, M_WAITOK | M_ZERO); 54145132Sanholt 55254025Sjeff entry->vaddr = kmem_alloc_attr(kernel_arena, size, M_WAITOK | M_ZERO, 56207067Srnoland 0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING); 57207067Srnoland if (entry->vaddr == 0) { 58198694Srnoland drm_sg_cleanup(entry); 59207067Srnoland return (ENOMEM); 60152909Sanholt } 61145132Sanholt 62207067Srnoland for(pindex = 0; pindex < entry->pages; pindex++) { 63207067Srnoland entry->busaddr[pindex] = 64207067Srnoland vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 65186295Srnoland } 66186295Srnoland 67145132Sanholt DRM_LOCK(); 68145132Sanholt if (dev->sg) { 69145132Sanholt DRM_UNLOCK(); 70145132Sanholt drm_sg_cleanup(entry); 71207067Srnoland return (EINVAL); 72145132Sanholt } 73145132Sanholt dev->sg = entry; 74145132Sanholt DRM_UNLOCK(); 75145132Sanholt 76207067Srnoland request->handle = entry->vaddr; 77207066Srnoland 78207067Srnoland DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n", 79207067Srnoland entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr); 80207066Srnoland 81207067Srnoland return (0); 82145132Sanholt} 83145132Sanholt 84186295Srnolandint 85186295Srnolanddrm_sg_alloc_ioctl(struct drm_device *dev, void *data, 86186295Srnoland struct drm_file *file_priv) 87186295Srnoland{ 88183573Srnoland struct drm_scatter_gather *request = data; 89182080Srnoland 90186295Srnoland DRM_DEBUG("\n"); 91182080Srnoland 92207067Srnoland return (drm_sg_alloc(dev, request)); 93182080Srnoland} 94182080Srnoland 95186295Srnolandvoid 96186295Srnolanddrm_sg_cleanup(struct drm_sg_mem *entry) 97182080Srnoland{ 98207067Srnoland if (entry == NULL) 99207067Srnoland return; 100186295Srnoland 101207067Srnoland if (entry->vaddr != 0) 102254025Sjeff kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages)); 103207067Srnoland 104207067Srnoland free(entry->busaddr, DRM_MEM_SGLISTS); 105207067Srnoland free(entry, DRM_MEM_DRIVER); 106207067Srnoland 107207067Srnoland return; 108186295Srnoland} 109186295Srnoland 110186295Srnolandint 111186295Srnolanddrm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv) 112186295Srnoland{ 113183573Srnoland struct drm_scatter_gather *request = data; 114186295Srnoland struct drm_sg_mem *entry; 115145132Sanholt 116145132Sanholt DRM_LOCK(); 117145132Sanholt entry = dev->sg; 118145132Sanholt dev->sg = NULL; 119145132Sanholt DRM_UNLOCK(); 120145132Sanholt 121207067Srnoland if (!entry || entry->vaddr != request->handle) 122207067Srnoland return (EINVAL); 123145132Sanholt 124207067Srnoland DRM_DEBUG("free 0x%zx\n", entry->vaddr); 125145132Sanholt 126145132Sanholt drm_sg_cleanup(entry); 127145132Sanholt 128207067Srnoland return (0); 129145132Sanholt} 130