Laura Abbott | b1fa6d8 | 2016-09-07 11:49:58 -0700 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright (C) 2011 Google, Inc. |
| 4 | * |
| 5 | * This software is licensed under the terms of the GNU General Public |
| 6 | * License version 2, as published by the Free Software Foundation, and |
| 7 | * may be copied, distributed, and modified under those terms. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/file.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | |
| 21 | #include "ion.h" |
| 22 | #include "ion_priv.h" |
| 23 | #include "compat_ion.h" |
| 24 | |
Laura Abbott | 02b2380 | 2016-09-07 11:49:59 -0700 | [diff] [blame] | 25 | union ion_ioctl_arg { |
| 26 | struct ion_fd_data fd; |
| 27 | struct ion_allocation_data allocation; |
| 28 | struct ion_handle_data handle; |
| 29 | struct ion_custom_data custom; |
| 30 | struct ion_heap_query query; |
| 31 | }; |
| 32 | |
| 33 | static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg) |
| 34 | { |
| 35 | int ret = 0; |
| 36 | |
| 37 | switch (cmd) { |
| 38 | case ION_IOC_HEAP_QUERY: |
| 39 | ret = arg->query.reserved0 != 0; |
| 40 | ret |= arg->query.reserved1 != 0; |
| 41 | ret |= arg->query.reserved2 != 0; |
| 42 | break; |
| 43 | default: |
| 44 | break; |
| 45 | } |
| 46 | |
| 47 | return ret ? -EINVAL : 0; |
| 48 | } |
| 49 | |
Laura Abbott | b1fa6d8 | 2016-09-07 11:49:58 -0700 | [diff] [blame] | 50 | /* fix up the cases where the ioctl direction bits are incorrect */ |
| 51 | static unsigned int ion_ioctl_dir(unsigned int cmd) |
| 52 | { |
| 53 | switch (cmd) { |
| 54 | case ION_IOC_SYNC: |
| 55 | case ION_IOC_FREE: |
| 56 | case ION_IOC_CUSTOM: |
| 57 | return _IOC_WRITE; |
| 58 | default: |
| 59 | return _IOC_DIR(cmd); |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 64 | { |
| 65 | struct ion_client *client = filp->private_data; |
| 66 | struct ion_device *dev = client->dev; |
| 67 | struct ion_handle *cleanup_handle = NULL; |
| 68 | int ret = 0; |
| 69 | unsigned int dir; |
Laura Abbott | 02b2380 | 2016-09-07 11:49:59 -0700 | [diff] [blame] | 70 | union ion_ioctl_arg data; |
Laura Abbott | b1fa6d8 | 2016-09-07 11:49:58 -0700 | [diff] [blame] | 71 | |
| 72 | dir = ion_ioctl_dir(cmd); |
| 73 | |
| 74 | if (_IOC_SIZE(cmd) > sizeof(data)) |
| 75 | return -EINVAL; |
| 76 | |
Laura Abbott | 02b2380 | 2016-09-07 11:49:59 -0700 | [diff] [blame] | 77 | /* |
| 78 | * The copy_from_user is unconditional here for both read and write |
| 79 | * to do the validate. If there is no write for the ioctl, the |
| 80 | * buffer is cleared |
| 81 | */ |
| 82 | if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd))) |
| 83 | return -EFAULT; |
| 84 | |
| 85 | ret = validate_ioctl_arg(cmd, &data); |
| 86 | if (WARN_ON_ONCE(ret)) |
| 87 | return ret; |
| 88 | |
| 89 | if (!(dir & _IOC_WRITE)) |
| 90 | memset(&data, 0, sizeof(data)); |
Laura Abbott | b1fa6d8 | 2016-09-07 11:49:58 -0700 | [diff] [blame] | 91 | |
| 92 | switch (cmd) { |
| 93 | case ION_IOC_ALLOC: |
| 94 | { |
| 95 | struct ion_handle *handle; |
| 96 | |
| 97 | handle = ion_alloc(client, data.allocation.len, |
| 98 | data.allocation.align, |
| 99 | data.allocation.heap_id_mask, |
| 100 | data.allocation.flags); |
| 101 | if (IS_ERR(handle)) |
| 102 | return PTR_ERR(handle); |
| 103 | |
| 104 | data.allocation.handle = handle->id; |
| 105 | |
| 106 | cleanup_handle = handle; |
| 107 | break; |
| 108 | } |
| 109 | case ION_IOC_FREE: |
| 110 | { |
| 111 | struct ion_handle *handle; |
| 112 | |
| 113 | mutex_lock(&client->lock); |
| 114 | handle = ion_handle_get_by_id_nolock(client, data.handle.handle); |
| 115 | if (IS_ERR(handle)) { |
| 116 | mutex_unlock(&client->lock); |
| 117 | return PTR_ERR(handle); |
| 118 | } |
| 119 | ion_free_nolock(client, handle); |
| 120 | ion_handle_put_nolock(handle); |
| 121 | mutex_unlock(&client->lock); |
| 122 | break; |
| 123 | } |
| 124 | case ION_IOC_SHARE: |
| 125 | case ION_IOC_MAP: |
| 126 | { |
| 127 | struct ion_handle *handle; |
| 128 | |
| 129 | handle = ion_handle_get_by_id(client, data.handle.handle); |
| 130 | if (IS_ERR(handle)) |
| 131 | return PTR_ERR(handle); |
| 132 | data.fd.fd = ion_share_dma_buf_fd(client, handle); |
| 133 | ion_handle_put(handle); |
| 134 | if (data.fd.fd < 0) |
| 135 | ret = data.fd.fd; |
| 136 | break; |
| 137 | } |
| 138 | case ION_IOC_IMPORT: |
| 139 | { |
| 140 | struct ion_handle *handle; |
| 141 | |
| 142 | handle = ion_import_dma_buf_fd(client, data.fd.fd); |
| 143 | if (IS_ERR(handle)) |
| 144 | ret = PTR_ERR(handle); |
| 145 | else |
| 146 | data.handle.handle = handle->id; |
| 147 | break; |
| 148 | } |
| 149 | case ION_IOC_SYNC: |
| 150 | { |
| 151 | ret = ion_sync_for_device(client, data.fd.fd); |
| 152 | break; |
| 153 | } |
| 154 | case ION_IOC_CUSTOM: |
| 155 | { |
| 156 | if (!dev->custom_ioctl) |
| 157 | return -ENOTTY; |
| 158 | ret = dev->custom_ioctl(client, data.custom.cmd, |
| 159 | data.custom.arg); |
| 160 | break; |
| 161 | } |
Laura Abbott | 02b2380 | 2016-09-07 11:49:59 -0700 | [diff] [blame] | 162 | case ION_IOC_HEAP_QUERY: |
| 163 | ret = ion_query_heaps(client, &data.query); |
| 164 | break; |
Laura Abbott | b1fa6d8 | 2016-09-07 11:49:58 -0700 | [diff] [blame] | 165 | default: |
| 166 | return -ENOTTY; |
| 167 | } |
| 168 | |
| 169 | if (dir & _IOC_READ) { |
| 170 | if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) { |
| 171 | if (cleanup_handle) |
| 172 | ion_free(client, cleanup_handle); |
| 173 | return -EFAULT; |
| 174 | } |
| 175 | } |
| 176 | return ret; |
| 177 | } |