1 /* 2 * Copyright (C) 2016 Google, Inc. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 */ 14 15 #include "goldfish_dma.h" 16 #include "qemu_pipe.h" 17 18 #if PLATFORM_SDK_VERSION < 26 19 #include <cutils/log.h> 20 #else 21 #include <log/log.h> 22 #endif 23 #include <errno.h> 24 #ifdef __ANDROID__ 25 #include <linux/ioctl.h> 26 #include <linux/types.h> 27 #include <sys/cdefs.h> 28 #endif 29 #include <sys/ioctl.h> 30 #include <sys/mman.h> 31 #include <fcntl.h> 32 #include <stdlib.h> 33 #include <stdlib.h> 34 #include <string.h> 35 36 /* There is an ioctl associated with goldfish dma driver. 37 * Make it conflict with ioctls that are not likely to be used 38 * in the emulator. 39 * 'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict! 40 * 'G' 00-0F linux/gigaset_dev.h conflict! 41 */ 42 #define GOLDFISH_DMA_IOC_MAGIC 'G' 43 44 #define GOLDFISH_DMA_IOC_LOCK _IOWR(GOLDFISH_DMA_IOC_MAGIC, 0, struct goldfish_dma_ioctl_info) 45 #define GOLDFISH_DMA_IOC_UNLOCK _IOWR(GOLDFISH_DMA_IOC_MAGIC, 1, struct goldfish_dma_ioctl_info) 46 #define GOLDFISH_DMA_IOC_GETOFF _IOWR(GOLDFISH_DMA_IOC_MAGIC, 2, struct goldfish_dma_ioctl_info) 47 #define GOLDFISH_DMA_IOC_CREATE_REGION _IOWR(GOLDFISH_DMA_IOC_MAGIC, 3, struct goldfish_dma_ioctl_info) 48 49 struct goldfish_dma_ioctl_info { 50 uint64_t phys_begin; 51 uint64_t size; 52 }; 53 54 int goldfish_dma_create_region(uint32_t sz, struct goldfish_dma_context* res) { 55 56 res->fd = qemu_pipe_open("opengles"); 57 res->mapped_addr = 0; 58 res->size = 0; 59 60 if (res->fd > 0) { 61 // now alloc 62 struct goldfish_dma_ioctl_info info; 63 info.size = sz; 64 int alloc_res = ioctl(res->fd, GOLDFISH_DMA_IOC_CREATE_REGION, &info); 65 66 if (alloc_res) { 67 ALOGE("%s: failed to allocate DMA region. errno=%d", 68 __FUNCTION__, errno); 69 close(res->fd); 70 res->fd = -1; 71 return alloc_res; 72 } 73 74 res->size = sz; 75 ALOGV("%s: successfully allocated goldfish DMA region with size %u cxt=%p fd=%d", 76 __FUNCTION__, sz, res, res->fd); 77 return 0; 78 } else { 79 ALOGE("%s: could not obtain fd to device! fd %d errno=%d\n", 80 __FUNCTION__, res->fd, errno); 81 return ENODEV; 82 } 83 } 84 85 void* goldfish_dma_map(struct goldfish_dma_context* cxt) { 86 ALOGV("%s: on fd %d errno=%d", __FUNCTION__, cxt->fd, errno); 87 void *mapped = mmap(0, cxt->size, PROT_WRITE, MAP_SHARED, cxt->fd, 0); 88 ALOGV("%s: cxt=%p mapped=%p size=%u errno=%d", 89 __FUNCTION__, cxt, mapped, cxt->size, errno); 90 91 if (mapped == MAP_FAILED) { 92 mapped = NULL; 93 } 94 95 cxt->mapped_addr = reinterpret_cast<uint64_t>(mapped); 96 return mapped; 97 } 98 99 int goldfish_dma_unmap(struct goldfish_dma_context* cxt) { 100 ALOGV("%s: cxt=%p mapped=0x%" PRIu64, __FUNCTION__, cxt, cxt->mapped_addr); 101 munmap(reinterpret_cast<void *>(cxt->mapped_addr), cxt->size); 102 cxt->mapped_addr = 0; 103 cxt->size = 0; 104 return 0; 105 } 106 107 void goldfish_dma_write(struct goldfish_dma_context* cxt, 108 const void* to_write, 109 uint32_t sz) { 110 ALOGV("%s: cxt=%p mapped=0x%" PRIu64 " to_write=%p size=%u", 111 __FUNCTION__, cxt, cxt->mapped_addr, to_write, sz); 112 memcpy(reinterpret_cast<void *>(cxt->mapped_addr), to_write, sz); 113 } 114 115 void goldfish_dma_free(goldfish_dma_context* cxt) { 116 close(cxt->fd); 117 } 118 119 uint64_t goldfish_dma_guest_paddr(const struct goldfish_dma_context* cxt) { 120 struct goldfish_dma_ioctl_info info; 121 ioctl(cxt->fd, GOLDFISH_DMA_IOC_GETOFF, &info); 122 return info.phys_begin; 123 } 124
