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 36282199Sdumbbell#define DEBUG_SCATTER 0 37282199Sdumbbell 38282199Sdumbbellstatic inline vm_offset_t drm_vmalloc_dma(vm_size_t size) 39235783Skib{ 40282199Sdumbbell return kmem_alloc_attr(kernel_arena, size, M_NOWAIT | M_ZERO, 41282199Sdumbbell 0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING); 42282199Sdumbbell} 43282199Sdumbbell 44282199Sdumbbellvoid drm_sg_cleanup(struct drm_sg_mem * entry) 45282199Sdumbbell{ 46282199Sdumbbell if (entry == NULL) 47282199Sdumbbell return; 48282199Sdumbbell 49282199Sdumbbell if (entry->vaddr != 0) 50282199Sdumbbell kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages)); 51282199Sdumbbell 52282199Sdumbbell free(entry->busaddr, DRM_MEM_SGLISTS); 53282199Sdumbbell free(entry, DRM_MEM_DRIVER); 54282199Sdumbbell} 55282199Sdumbbell 56282199Sdumbbellint drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request) 57282199Sdumbbell{ 58235783Skib struct drm_sg_mem *entry; 59235783Skib vm_size_t size; 60235783Skib vm_pindex_t pindex; 61235783Skib 62282199Sdumbbell DRM_DEBUG("\n"); 63282199Sdumbbell 64282199Sdumbbell if (!drm_core_check_feature(dev, DRIVER_SG)) 65282199Sdumbbell return -EINVAL; 66282199Sdumbbell 67235783Skib if (dev->sg) 68282199Sdumbbell return -EINVAL; 69235783Skib 70282199Sdumbbell entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO); 71282199Sdumbbell if (!entry) 72282199Sdumbbell return -ENOMEM; 73282199Sdumbbell 74235783Skib DRM_DEBUG("request size=%ld\n", request->size); 75235783Skib 76235783Skib size = round_page(request->size); 77235783Skib entry->pages = OFF_TO_IDX(size); 78235783Skib entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr), 79282199Sdumbbell DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO); 80282199Sdumbbell if (!entry->busaddr) { 81282199Sdumbbell free(entry, DRM_MEM_DRIVER); 82282199Sdumbbell return -ENOMEM; 83282199Sdumbbell } 84235783Skib 85282199Sdumbbell entry->vaddr = drm_vmalloc_dma(size); 86235783Skib if (entry->vaddr == 0) { 87282199Sdumbbell free(entry->busaddr, DRM_MEM_DRIVER); 88282199Sdumbbell free(entry, DRM_MEM_DRIVER); 89282199Sdumbbell return -ENOMEM; 90235783Skib } 91235783Skib 92282199Sdumbbell for (pindex = 0; pindex < entry->pages; pindex++) { 93235783Skib entry->busaddr[pindex] = 94235783Skib vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 95235783Skib } 96235783Skib 97282199Sdumbbell request->handle = entry->vaddr; 98282199Sdumbbell 99235783Skib dev->sg = entry; 100235783Skib 101235783Skib DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n", 102235783Skib entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr); 103235783Skib 104282199Sdumbbell return 0; 105235783Skib} 106235783Skib 107282199Sdumbbellint drm_sg_alloc_ioctl(struct drm_device *dev, void *data, 108282199Sdumbbell struct drm_file *file_priv) 109235783Skib{ 110235783Skib struct drm_scatter_gather *request = data; 111235783Skib 112282199Sdumbbell return drm_sg_alloc(dev, request); 113235783Skib 114235783Skib} 115235783Skib 116282199Sdumbbellint drm_sg_free(struct drm_device *dev, void *data, 117282199Sdumbbell struct drm_file *file_priv) 118235783Skib{ 119235783Skib struct drm_scatter_gather *request = data; 120235783Skib struct drm_sg_mem *entry; 121235783Skib 122282199Sdumbbell if (!drm_core_check_feature(dev, DRIVER_SG)) 123282199Sdumbbell return -EINVAL; 124282199Sdumbbell 125235783Skib entry = dev->sg; 126235783Skib dev->sg = NULL; 127235783Skib 128235783Skib if (!entry || entry->vaddr != request->handle) 129282199Sdumbbell return -EINVAL; 130235783Skib 131235783Skib DRM_DEBUG("free 0x%zx\n", entry->vaddr); 132235783Skib 133235783Skib drm_sg_cleanup(entry); 134235783Skib 135282199Sdumbbell return 0; 136235783Skib} 137