Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 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 <linux/fdtable.h> |
| 16 | #include <linux/file.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/miscdevice.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/kref.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/types.h> |
| 27 | |
| 28 | #include <linux/io.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/acpi.h> |
| 31 | |
| 32 | #include <linux/string.h> |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 33 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 34 | #include <linux/fs.h> |
| 35 | #include <linux/syscalls.h> |
| 36 | #include <linux/sync_file.h> |
| 37 | #include <linux/fence.h> |
| 38 | |
| 39 | #include "goldfish_sync_timeline_fence.h" |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 40 | |
| 41 | #define ERR(...) printk(KERN_ERR __VA_ARGS__); |
| 42 | |
| 43 | #define INFO(...) printk(KERN_INFO __VA_ARGS__); |
| 44 | |
| 45 | #define DPRINT(...) pr_debug(__VA_ARGS__); |
| 46 | |
| 47 | #define DTRACE() DPRINT("%s: enter", __func__) |
| 48 | |
| 49 | /* The Goldfish sync driver is designed to provide a interface |
| 50 | * between the underlying host's sync device and the kernel's |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 51 | * fence sync framework.. |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 52 | * The purpose of the device/driver is to enable lightweight |
| 53 | * creation and signaling of timelines and fences |
| 54 | * in order to synchronize the guest with host-side graphics events. |
| 55 | * |
| 56 | * Each time the interrupt trips, the driver |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 57 | * may perform a sync operation. |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 58 | */ |
| 59 | |
| 60 | /* The operations are: */ |
| 61 | |
| 62 | /* Ready signal - used to mark when irq should lower */ |
| 63 | #define CMD_SYNC_READY 0 |
| 64 | |
| 65 | /* Create a new timeline. writes timeline handle */ |
| 66 | #define CMD_CREATE_SYNC_TIMELINE 1 |
| 67 | |
| 68 | /* Create a fence object. reads timeline handle and time argument. |
| 69 | * Writes fence fd to the SYNC_REG_HANDLE register. */ |
| 70 | #define CMD_CREATE_SYNC_FENCE 2 |
| 71 | |
| 72 | /* Increments timeline. reads timeline handle and time argument */ |
| 73 | #define CMD_SYNC_TIMELINE_INC 3 |
| 74 | |
| 75 | /* Destroys a timeline. reads timeline handle */ |
| 76 | #define CMD_DESTROY_SYNC_TIMELINE 4 |
| 77 | |
| 78 | /* Starts a wait on the host with |
| 79 | * the given glsync object and sync thread handle. */ |
| 80 | #define CMD_TRIGGER_HOST_WAIT 5 |
| 81 | |
| 82 | /* The register layout is: */ |
| 83 | |
| 84 | #define SYNC_REG_BATCH_COMMAND 0x00 /* host->guest batch commands */ |
| 85 | #define SYNC_REG_BATCH_GUESTCOMMAND 0x04 /* guest->host batch commands */ |
| 86 | #define SYNC_REG_BATCH_COMMAND_ADDR 0x08 /* communicate physical address of host->guest batch commands */ |
| 87 | #define SYNC_REG_BATCH_COMMAND_ADDR_HIGH 0x0c /* 64-bit part */ |
| 88 | #define SYNC_REG_BATCH_GUESTCOMMAND_ADDR 0x10 /* communicate physical address of guest->host commands */ |
| 89 | #define SYNC_REG_BATCH_GUESTCOMMAND_ADDR_HIGH 0x14 /* 64-bit part */ |
| 90 | #define SYNC_REG_INIT 0x18 /* signals that the device has been probed */ |
| 91 | |
| 92 | /* There is an ioctl associated with goldfish sync driver. |
| 93 | * Make it conflict with ioctls that are not likely to be used |
| 94 | * in the emulator. |
| 95 | * |
| 96 | * '@' 00-0F linux/radeonfb.h conflict! |
| 97 | * '@' 00-0F drivers/video/aty/aty128fb.c conflict! |
| 98 | */ |
| 99 | #define GOLDFISH_SYNC_IOC_MAGIC '@' |
| 100 | |
| 101 | #define GOLDFISH_SYNC_IOC_QUEUE_WORK _IOWR(GOLDFISH_SYNC_IOC_MAGIC, 0, struct goldfish_sync_ioctl_info) |
| 102 | |
| 103 | /* The above definitions (command codes, register layout, ioctl definitions) |
| 104 | * need to be in sync with the following files: |
| 105 | * |
| 106 | * Host-side (emulator): |
| 107 | * external/qemu/android/emulation/goldfish_sync.h |
| 108 | * external/qemu-android/hw/misc/goldfish_sync.c |
| 109 | * |
| 110 | * Guest-side (system image): |
| 111 | * device/generic/goldfish-opengl/system/egl/goldfish_sync.h |
| 112 | * device/generic/goldfish/ueventd.ranchu.rc |
| 113 | * platform/build/target/board/generic/sepolicy/file_contexts |
| 114 | */ |
| 115 | struct goldfish_sync_hostcmd { |
| 116 | /* sorted for alignment */ |
| 117 | uint64_t handle; |
| 118 | uint64_t hostcmd_handle; |
| 119 | uint32_t cmd; |
| 120 | uint32_t time_arg; |
| 121 | }; |
| 122 | |
| 123 | struct goldfish_sync_guestcmd { |
| 124 | uint64_t host_command; /* uint64_t for alignment */ |
| 125 | uint64_t glsync_handle; |
| 126 | uint64_t thread_handle; |
| 127 | uint64_t guest_timeline_handle; |
| 128 | }; |
| 129 | |
Lingfeng Yang | e425496 | 2017-02-09 07:43:47 -0800 | [diff] [blame] | 130 | #define GOLDFISH_SYNC_MAX_CMDS 32 |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 131 | |
| 132 | struct goldfish_sync_state { |
| 133 | char __iomem *reg_base; |
| 134 | int irq; |
| 135 | |
| 136 | /* Spinlock protects |to_do| / |to_do_end|. */ |
| 137 | spinlock_t lock; |
| 138 | /* |mutex_lock| protects all concurrent access |
| 139 | * to timelines for both kernel and user space. */ |
| 140 | struct mutex mutex_lock; |
| 141 | |
| 142 | /* Buffer holding commands issued from host. */ |
| 143 | struct goldfish_sync_hostcmd to_do[GOLDFISH_SYNC_MAX_CMDS]; |
| 144 | uint32_t to_do_end; |
| 145 | |
| 146 | /* Addresses for the reading or writing |
| 147 | * of individual commands. The host can directly write |
| 148 | * to |batch_hostcmd| (and then this driver immediately |
| 149 | * copies contents to |to_do|). This driver either replies |
| 150 | * through |batch_hostcmd| or simply issues a |
| 151 | * guest->host command through |batch_guestcmd|. |
| 152 | */ |
| 153 | struct goldfish_sync_hostcmd *batch_hostcmd; |
| 154 | struct goldfish_sync_guestcmd *batch_guestcmd; |
| 155 | |
| 156 | /* Used to give this struct itself to a work queue |
| 157 | * function for executing actual sync commands. */ |
| 158 | struct work_struct work_item; |
| 159 | }; |
| 160 | |
| 161 | static struct goldfish_sync_state global_sync_state[1]; |
| 162 | |
| 163 | struct goldfish_sync_timeline_obj { |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 164 | struct goldfish_sync_timeline *sync_tl; |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 165 | uint32_t current_time; |
| 166 | /* We need to be careful about when we deallocate |
| 167 | * this |goldfish_sync_timeline_obj| struct. |
| 168 | * In order to ensure proper cleanup, we need to |
| 169 | * consider the triggered host-side wait that may |
| 170 | * still be in flight when the guest close()'s a |
| 171 | * goldfish_sync device's sync context fd (and |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 172 | * destroys the |sync_tl| field above). |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 173 | * The host-side wait may raise IRQ |
| 174 | * and tell the kernel to increment the timeline _after_ |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 175 | * the |sync_tl| has already been set to null. |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 176 | * |
| 177 | * From observations on OpenGL apps and CTS tests, this |
| 178 | * happens at some very low probability upon context |
| 179 | * destruction or process close, but it does happen |
| 180 | * and it needs to be handled properly. Otherwise, |
| 181 | * if we clean up the surrounding |goldfish_sync_timeline_obj| |
| 182 | * too early, any |handle| field of any host->guest command |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 183 | * might not even point to a null |sync_tl| field, |
| 184 | * but to garbage memory or even a reclaimed |sync_tl|. |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 185 | * If we do not count such "pending waits" and kfree the object |
| 186 | * immediately upon |goldfish_sync_timeline_destroy|, |
| 187 | * we might get mysterous RCU stalls after running a long |
| 188 | * time because the garbage memory that is being read |
| 189 | * happens to be interpretable as a |spinlock_t| struct |
| 190 | * that is currently in the locked state. |
| 191 | * |
| 192 | * To track when to free the |goldfish_sync_timeline_obj| |
| 193 | * itself, we maintain a kref. |
| 194 | * The kref essentially counts the timeline itself plus |
| 195 | * the number of waits in flight. kref_init/kref_put |
| 196 | * are issued on |
| 197 | * |goldfish_sync_timeline_create|/|goldfish_sync_timeline_destroy| |
| 198 | * and kref_get/kref_put are issued on |
| 199 | * |goldfish_sync_fence_create|/|goldfish_sync_timeline_inc|. |
| 200 | * |
| 201 | * The timeline is destroyed after reference count |
| 202 | * reaches zero, which would happen after |
| 203 | * |goldfish_sync_timeline_destroy| and all pending |
| 204 | * |goldfish_sync_timeline_inc|'s are fulfilled. |
| 205 | * |
| 206 | * NOTE (1): We assume that |fence_create| and |
| 207 | * |timeline_inc| calls are 1:1, otherwise the kref scheme |
| 208 | * will not work. This is a valid assumption as long |
| 209 | * as the host-side virtual device implementation |
| 210 | * does not insert any timeline increments |
| 211 | * that we did not trigger from here. |
| 212 | * |
| 213 | * NOTE (2): The use of kref by itself requires no locks, |
| 214 | * but this does not mean everything works without locks. |
| 215 | * Related timeline operations do require a lock of some sort, |
| 216 | * or at least are not proven to work without it. |
| 217 | * In particualr, we assume that all the operations |
| 218 | * done on the |kref| field above are done in contexts where |
| 219 | * |global_sync_state->mutex_lock| is held. Do not |
| 220 | * remove that lock until everything is proven to work |
| 221 | * without it!!! */ |
| 222 | struct kref kref; |
| 223 | }; |
| 224 | |
| 225 | /* We will call |delete_timeline_obj| when the last reference count |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 226 | * of the kref is decremented. This deletes the sync |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 227 | * timeline object along with the wrapper itself. */ |
| 228 | static void delete_timeline_obj(struct kref* kref) { |
| 229 | struct goldfish_sync_timeline_obj* obj = |
| 230 | container_of(kref, struct goldfish_sync_timeline_obj, kref); |
| 231 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 232 | goldfish_sync_timeline_put_internal(obj->sync_tl); |
| 233 | obj->sync_tl = NULL; |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 234 | kfree(obj); |
| 235 | } |
| 236 | |
| 237 | static uint64_t gensym_ctr; |
| 238 | static void gensym(char *dst) |
| 239 | { |
| 240 | sprintf(dst, "goldfish_sync:gensym:%llu", gensym_ctr); |
| 241 | gensym_ctr++; |
| 242 | } |
| 243 | |
| 244 | /* |goldfish_sync_timeline_create| assumes that |global_sync_state->mutex_lock| |
| 245 | * is held. */ |
| 246 | static struct goldfish_sync_timeline_obj* |
| 247 | goldfish_sync_timeline_create(void) |
| 248 | { |
| 249 | |
| 250 | char timeline_name[256]; |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 251 | struct goldfish_sync_timeline *res_sync_tl = NULL; |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 252 | struct goldfish_sync_timeline_obj *res; |
| 253 | |
| 254 | DTRACE(); |
| 255 | |
| 256 | gensym(timeline_name); |
| 257 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 258 | res_sync_tl = goldfish_sync_timeline_create_internal(timeline_name); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 259 | if (!res_sync_tl) { |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 260 | ERR("Failed to create goldfish_sw_sync timeline."); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 261 | return NULL; |
| 262 | } |
| 263 | |
| 264 | res = kzalloc(sizeof(struct goldfish_sync_timeline_obj), GFP_KERNEL); |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 265 | res->sync_tl = res_sync_tl; |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 266 | res->current_time = 0; |
| 267 | kref_init(&res->kref); |
| 268 | |
| 269 | DPRINT("new timeline_obj=0x%p", res); |
| 270 | return res; |
| 271 | } |
| 272 | |
| 273 | /* |goldfish_sync_fence_create| assumes that |global_sync_state->mutex_lock| |
| 274 | * is held. */ |
| 275 | static int |
| 276 | goldfish_sync_fence_create(struct goldfish_sync_timeline_obj *obj, |
| 277 | uint32_t val) |
| 278 | { |
| 279 | |
| 280 | int fd; |
| 281 | char fence_name[256]; |
| 282 | struct sync_pt *syncpt = NULL; |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 283 | struct sync_file *sync_file_obj = NULL; |
| 284 | struct goldfish_sync_timeline *tl; |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 285 | |
| 286 | DTRACE(); |
| 287 | |
| 288 | if (!obj) return -1; |
| 289 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 290 | tl = obj->sync_tl; |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 291 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 292 | syncpt = goldfish_sync_pt_create_internal( |
| 293 | tl, sizeof(struct sync_pt) + 4, val); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 294 | if (!syncpt) { |
| 295 | ERR("could not create sync point! " |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 296 | "goldfish_sync_timeline=0x%p val=%d", |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 297 | tl, val); |
| 298 | return -1; |
| 299 | } |
| 300 | |
| 301 | fd = get_unused_fd_flags(O_CLOEXEC); |
| 302 | if (fd < 0) { |
| 303 | ERR("could not get unused fd for sync fence. " |
| 304 | "errno=%d", fd); |
| 305 | goto err_cleanup_pt; |
| 306 | } |
| 307 | |
| 308 | gensym(fence_name); |
| 309 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 310 | sync_file_obj = sync_file_create(&syncpt->base); |
| 311 | if (!sync_file_obj) { |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 312 | ERR("could not create sync fence! " |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 313 | "goldfish_sync_timeline=0x%p val=%d sync_pt=0x%p", |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 314 | tl, val, syncpt); |
| 315 | goto err_cleanup_fd_pt; |
| 316 | } |
| 317 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 318 | DPRINT("installing sync fence into fd %d sync_file_obj=0x%p", |
| 319 | fd, sync_file_obj); |
| 320 | fd_install(fd, sync_file_obj->file); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 321 | kref_get(&obj->kref); |
| 322 | |
| 323 | return fd; |
| 324 | |
| 325 | err_cleanup_fd_pt: |
| 326 | put_unused_fd(fd); |
| 327 | err_cleanup_pt: |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 328 | fence_put(&syncpt->base); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 329 | return -1; |
| 330 | } |
| 331 | |
| 332 | /* |goldfish_sync_timeline_inc| assumes that |global_sync_state->mutex_lock| |
| 333 | * is held. */ |
| 334 | static void |
| 335 | goldfish_sync_timeline_inc(struct goldfish_sync_timeline_obj *obj, uint32_t inc) |
| 336 | { |
| 337 | DTRACE(); |
| 338 | /* Just give up if someone else nuked the timeline. |
| 339 | * Whoever it was won't care that it doesn't get signaled. */ |
| 340 | if (!obj) return; |
| 341 | |
| 342 | DPRINT("timeline_obj=0x%p", obj); |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 343 | goldfish_sync_timeline_signal_internal(obj->sync_tl, inc); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 344 | DPRINT("incremented timeline. increment max_time"); |
| 345 | obj->current_time += inc; |
| 346 | |
| 347 | /* Here, we will end up deleting the timeline object if it |
| 348 | * turns out that this call was a pending increment after |
| 349 | * |goldfish_sync_timeline_destroy| was called. */ |
| 350 | kref_put(&obj->kref, delete_timeline_obj); |
| 351 | DPRINT("done"); |
| 352 | } |
| 353 | |
| 354 | /* |goldfish_sync_timeline_destroy| assumes |
| 355 | * that |global_sync_state->mutex_lock| is held. */ |
| 356 | static void |
| 357 | goldfish_sync_timeline_destroy(struct goldfish_sync_timeline_obj *obj) |
| 358 | { |
| 359 | DTRACE(); |
| 360 | /* See description of |goldfish_sync_timeline_obj| for why we |
| 361 | * should not immediately destroy |obj| */ |
| 362 | kref_put(&obj->kref, delete_timeline_obj); |
| 363 | } |
| 364 | |
| 365 | static inline void |
| 366 | goldfish_sync_cmd_queue(struct goldfish_sync_state *sync_state, |
| 367 | uint32_t cmd, |
| 368 | uint64_t handle, |
| 369 | uint32_t time_arg, |
| 370 | uint64_t hostcmd_handle) |
| 371 | { |
| 372 | struct goldfish_sync_hostcmd *to_add; |
| 373 | |
| 374 | DTRACE(); |
| 375 | |
| 376 | BUG_ON(sync_state->to_do_end == GOLDFISH_SYNC_MAX_CMDS); |
| 377 | |
| 378 | to_add = &sync_state->to_do[sync_state->to_do_end]; |
| 379 | |
| 380 | to_add->cmd = cmd; |
| 381 | to_add->handle = handle; |
| 382 | to_add->time_arg = time_arg; |
| 383 | to_add->hostcmd_handle = hostcmd_handle; |
| 384 | |
| 385 | sync_state->to_do_end += 1; |
| 386 | } |
| 387 | |
| 388 | static inline void |
| 389 | goldfish_sync_hostcmd_reply(struct goldfish_sync_state *sync_state, |
| 390 | uint32_t cmd, |
| 391 | uint64_t handle, |
| 392 | uint32_t time_arg, |
| 393 | uint64_t hostcmd_handle) |
| 394 | { |
| 395 | unsigned long irq_flags; |
| 396 | struct goldfish_sync_hostcmd *batch_hostcmd = |
| 397 | sync_state->batch_hostcmd; |
| 398 | |
| 399 | DTRACE(); |
| 400 | |
| 401 | spin_lock_irqsave(&sync_state->lock, irq_flags); |
| 402 | |
| 403 | batch_hostcmd->cmd = cmd; |
| 404 | batch_hostcmd->handle = handle; |
| 405 | batch_hostcmd->time_arg = time_arg; |
| 406 | batch_hostcmd->hostcmd_handle = hostcmd_handle; |
| 407 | writel(0, sync_state->reg_base + SYNC_REG_BATCH_COMMAND); |
| 408 | |
| 409 | spin_unlock_irqrestore(&sync_state->lock, irq_flags); |
| 410 | } |
| 411 | |
| 412 | static inline void |
| 413 | goldfish_sync_send_guestcmd(struct goldfish_sync_state *sync_state, |
| 414 | uint32_t cmd, |
| 415 | uint64_t glsync_handle, |
| 416 | uint64_t thread_handle, |
| 417 | uint64_t timeline_handle) |
| 418 | { |
| 419 | unsigned long irq_flags; |
| 420 | struct goldfish_sync_guestcmd *batch_guestcmd = |
| 421 | sync_state->batch_guestcmd; |
| 422 | |
| 423 | DTRACE(); |
| 424 | |
| 425 | spin_lock_irqsave(&sync_state->lock, irq_flags); |
| 426 | |
| 427 | batch_guestcmd->host_command = (uint64_t)cmd; |
| 428 | batch_guestcmd->glsync_handle = (uint64_t)glsync_handle; |
| 429 | batch_guestcmd->thread_handle = (uint64_t)thread_handle; |
| 430 | batch_guestcmd->guest_timeline_handle = (uint64_t)timeline_handle; |
| 431 | writel(0, sync_state->reg_base + SYNC_REG_BATCH_GUESTCOMMAND); |
| 432 | |
| 433 | spin_unlock_irqrestore(&sync_state->lock, irq_flags); |
| 434 | } |
| 435 | |
| 436 | /* |goldfish_sync_interrupt| handles IRQ raises from the virtual device. |
| 437 | * In the context of OpenGL, this interrupt will fire whenever we need |
| 438 | * to signal a fence fd in the guest, with the command |
| 439 | * |CMD_SYNC_TIMELINE_INC|. |
| 440 | * However, because this function will be called in an interrupt context, |
| 441 | * it is necessary to do the actual work of signaling off of interrupt context. |
| 442 | * The shared work queue is used for this purpose. At the end when |
| 443 | * all pending commands are intercepted by the interrupt handler, |
| 444 | * we call |schedule_work|, which will later run the actual |
| 445 | * desired sync command in |goldfish_sync_work_item_fn|. |
| 446 | */ |
| 447 | static irqreturn_t goldfish_sync_interrupt(int irq, void *dev_id) |
| 448 | { |
| 449 | |
| 450 | struct goldfish_sync_state *sync_state = dev_id; |
| 451 | |
| 452 | uint32_t nextcmd; |
| 453 | uint32_t command_r; |
| 454 | uint64_t handle_rw; |
| 455 | uint32_t time_r; |
| 456 | uint64_t hostcmd_handle_rw; |
| 457 | |
| 458 | int count = 0; |
| 459 | |
| 460 | DTRACE(); |
| 461 | |
| 462 | sync_state = dev_id; |
| 463 | |
| 464 | spin_lock(&sync_state->lock); |
| 465 | |
| 466 | for (;;) { |
| 467 | |
| 468 | readl(sync_state->reg_base + SYNC_REG_BATCH_COMMAND); |
| 469 | nextcmd = sync_state->batch_hostcmd->cmd; |
| 470 | |
| 471 | if (nextcmd == 0) |
| 472 | break; |
| 473 | |
| 474 | command_r = nextcmd; |
| 475 | handle_rw = sync_state->batch_hostcmd->handle; |
| 476 | time_r = sync_state->batch_hostcmd->time_arg; |
| 477 | hostcmd_handle_rw = sync_state->batch_hostcmd->hostcmd_handle; |
| 478 | |
| 479 | goldfish_sync_cmd_queue( |
| 480 | sync_state, |
| 481 | command_r, |
| 482 | handle_rw, |
| 483 | time_r, |
| 484 | hostcmd_handle_rw); |
| 485 | |
| 486 | count++; |
| 487 | } |
| 488 | |
| 489 | spin_unlock(&sync_state->lock); |
| 490 | |
| 491 | schedule_work(&sync_state->work_item); |
| 492 | |
| 493 | return (count == 0) ? IRQ_NONE : IRQ_HANDLED; |
| 494 | } |
| 495 | |
| 496 | /* |goldfish_sync_work_item_fn| does the actual work of servicing |
| 497 | * host->guest sync commands. This function is triggered whenever |
| 498 | * the IRQ for the goldfish sync device is raised. Once it starts |
| 499 | * running, it grabs the contents of the buffer containing the |
| 500 | * commands it needs to execute (there may be multiple, because |
| 501 | * our IRQ is active high and not edge triggered), and then |
| 502 | * runs all of them one after the other. |
| 503 | */ |
| 504 | static void goldfish_sync_work_item_fn(struct work_struct *input) |
| 505 | { |
| 506 | |
| 507 | struct goldfish_sync_state *sync_state; |
| 508 | int sync_fence_fd; |
| 509 | |
| 510 | struct goldfish_sync_timeline_obj *timeline; |
| 511 | uint64_t timeline_ptr; |
| 512 | |
| 513 | uint64_t hostcmd_handle; |
| 514 | |
| 515 | uint32_t cmd; |
| 516 | uint64_t handle; |
| 517 | uint32_t time_arg; |
| 518 | |
| 519 | struct goldfish_sync_hostcmd *todo; |
| 520 | uint32_t todo_end; |
| 521 | |
| 522 | unsigned long irq_flags; |
| 523 | |
| 524 | struct goldfish_sync_hostcmd to_run[GOLDFISH_SYNC_MAX_CMDS]; |
| 525 | uint32_t i = 0; |
| 526 | |
| 527 | sync_state = container_of(input, struct goldfish_sync_state, work_item); |
| 528 | |
| 529 | mutex_lock(&sync_state->mutex_lock); |
| 530 | |
| 531 | spin_lock_irqsave(&sync_state->lock, irq_flags); { |
| 532 | |
| 533 | todo_end = sync_state->to_do_end; |
| 534 | |
| 535 | DPRINT("num sync todos: %u", sync_state->to_do_end); |
| 536 | |
| 537 | for (i = 0; i < todo_end; i++) |
| 538 | to_run[i] = sync_state->to_do[i]; |
| 539 | |
| 540 | /* We expect that commands will come in at a slow enough rate |
| 541 | * so that incoming items will not be more than |
| 542 | * GOLDFISH_SYNC_MAX_CMDS. |
| 543 | * |
| 544 | * This is because the way the sync device is used, |
| 545 | * it's only for managing buffer data transfers per frame, |
| 546 | * with a sequential dependency between putting things in |
| 547 | * to_do and taking them out. Once a set of commands is |
| 548 | * queued up in to_do, the user of the device waits for |
| 549 | * them to be processed before queuing additional commands, |
| 550 | * which limits the rate at which commands come in |
| 551 | * to the rate at which we take them out here. |
| 552 | * |
| 553 | * We also don't expect more than MAX_CMDS to be issued |
| 554 | * at once; there is a correspondence between |
| 555 | * which buffers need swapping to the (display / buffer queue) |
| 556 | * to particular commands, and we don't expect there to be |
| 557 | * enough display or buffer queues in operation at once |
| 558 | * to overrun GOLDFISH_SYNC_MAX_CMDS. |
| 559 | */ |
| 560 | sync_state->to_do_end = 0; |
| 561 | |
| 562 | } spin_unlock_irqrestore(&sync_state->lock, irq_flags); |
| 563 | |
| 564 | for (i = 0; i < todo_end; i++) { |
| 565 | DPRINT("todo index: %u", i); |
| 566 | |
| 567 | todo = &to_run[i]; |
| 568 | |
| 569 | cmd = todo->cmd; |
| 570 | |
| 571 | handle = (uint64_t)todo->handle; |
| 572 | time_arg = todo->time_arg; |
| 573 | hostcmd_handle = (uint64_t)todo->hostcmd_handle; |
| 574 | |
| 575 | DTRACE(); |
| 576 | |
| 577 | timeline = (struct goldfish_sync_timeline_obj *)(uintptr_t)handle; |
| 578 | |
| 579 | switch (cmd) { |
| 580 | case CMD_SYNC_READY: |
| 581 | break; |
| 582 | case CMD_CREATE_SYNC_TIMELINE: |
| 583 | DPRINT("exec CMD_CREATE_SYNC_TIMELINE: " |
| 584 | "handle=0x%llx time_arg=%d", |
| 585 | handle, time_arg); |
| 586 | timeline = goldfish_sync_timeline_create(); |
| 587 | timeline_ptr = (uintptr_t)timeline; |
| 588 | goldfish_sync_hostcmd_reply(sync_state, CMD_CREATE_SYNC_TIMELINE, |
| 589 | timeline_ptr, |
| 590 | 0, |
| 591 | hostcmd_handle); |
| 592 | DPRINT("sync timeline created: %p", timeline); |
| 593 | break; |
| 594 | case CMD_CREATE_SYNC_FENCE: |
| 595 | DPRINT("exec CMD_CREATE_SYNC_FENCE: " |
| 596 | "handle=0x%llx time_arg=%d", |
| 597 | handle, time_arg); |
| 598 | sync_fence_fd = goldfish_sync_fence_create(timeline, time_arg); |
| 599 | goldfish_sync_hostcmd_reply(sync_state, CMD_CREATE_SYNC_FENCE, |
| 600 | sync_fence_fd, |
| 601 | 0, |
| 602 | hostcmd_handle); |
| 603 | break; |
| 604 | case CMD_SYNC_TIMELINE_INC: |
| 605 | DPRINT("exec CMD_SYNC_TIMELINE_INC: " |
| 606 | "handle=0x%llx time_arg=%d", |
| 607 | handle, time_arg); |
| 608 | goldfish_sync_timeline_inc(timeline, time_arg); |
| 609 | break; |
| 610 | case CMD_DESTROY_SYNC_TIMELINE: |
| 611 | DPRINT("exec CMD_DESTROY_SYNC_TIMELINE: " |
| 612 | "handle=0x%llx time_arg=%d", |
| 613 | handle, time_arg); |
| 614 | goldfish_sync_timeline_destroy(timeline); |
| 615 | break; |
| 616 | } |
| 617 | DPRINT("Done executing sync command"); |
| 618 | } |
| 619 | mutex_unlock(&sync_state->mutex_lock); |
| 620 | } |
| 621 | |
| 622 | /* Guest-side interface: file operations */ |
| 623 | |
| 624 | /* Goldfish sync context and ioctl info. |
| 625 | * |
| 626 | * When a sync context is created by open()-ing the goldfish sync device, we |
| 627 | * create a sync context (|goldfish_sync_context|). |
| 628 | * |
| 629 | * Currently, the only data required to track is the sync timeline itself |
| 630 | * along with the current time, which are all packed up in the |
| 631 | * |goldfish_sync_timeline_obj| field. We use a |goldfish_sync_context| |
| 632 | * as the filp->private_data. |
| 633 | * |
| 634 | * Next, when a sync context user requests that work be queued and a fence |
| 635 | * fd provided, we use the |goldfish_sync_ioctl_info| struct, which holds |
| 636 | * information about which host handles to touch for this particular |
| 637 | * queue-work operation. We need to know about the host-side sync thread |
| 638 | * and the particular host-side GLsync object. We also possibly write out |
| 639 | * a file descriptor. |
| 640 | */ |
| 641 | struct goldfish_sync_context { |
| 642 | struct goldfish_sync_timeline_obj *timeline; |
| 643 | }; |
| 644 | |
| 645 | struct goldfish_sync_ioctl_info { |
| 646 | uint64_t host_glsync_handle_in; |
| 647 | uint64_t host_syncthread_handle_in; |
| 648 | int fence_fd_out; |
| 649 | }; |
| 650 | |
| 651 | static int goldfish_sync_open(struct inode *inode, struct file *file) |
| 652 | { |
| 653 | |
| 654 | struct goldfish_sync_context *sync_context; |
| 655 | |
| 656 | DTRACE(); |
| 657 | |
| 658 | mutex_lock(&global_sync_state->mutex_lock); |
| 659 | |
| 660 | sync_context = kzalloc(sizeof(struct goldfish_sync_context), GFP_KERNEL); |
| 661 | |
| 662 | if (sync_context == NULL) { |
| 663 | ERR("Creation of goldfish sync context failed!"); |
| 664 | mutex_unlock(&global_sync_state->mutex_lock); |
| 665 | return -ENOMEM; |
| 666 | } |
| 667 | |
| 668 | sync_context->timeline = NULL; |
| 669 | |
| 670 | file->private_data = sync_context; |
| 671 | |
| 672 | DPRINT("successfully create a sync context @0x%p", sync_context); |
| 673 | |
| 674 | mutex_unlock(&global_sync_state->mutex_lock); |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | static int goldfish_sync_release(struct inode *inode, struct file *file) |
| 680 | { |
| 681 | |
| 682 | struct goldfish_sync_context *sync_context; |
| 683 | |
| 684 | DTRACE(); |
| 685 | |
| 686 | mutex_lock(&global_sync_state->mutex_lock); |
| 687 | |
| 688 | sync_context = file->private_data; |
| 689 | |
| 690 | if (sync_context->timeline) |
| 691 | goldfish_sync_timeline_destroy(sync_context->timeline); |
| 692 | |
| 693 | sync_context->timeline = NULL; |
| 694 | |
| 695 | kfree(sync_context); |
| 696 | |
| 697 | mutex_unlock(&global_sync_state->mutex_lock); |
| 698 | |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | /* |goldfish_sync_ioctl| is the guest-facing interface of goldfish sync |
| 703 | * and is used in conjunction with eglCreateSyncKHR to queue up the |
| 704 | * actual work of waiting for the EGL sync command to complete, |
| 705 | * possibly returning a fence fd to the guest. |
| 706 | */ |
| 707 | static long goldfish_sync_ioctl(struct file *file, |
| 708 | unsigned int cmd, |
| 709 | unsigned long arg) |
| 710 | { |
| 711 | struct goldfish_sync_context *sync_context_data; |
| 712 | struct goldfish_sync_timeline_obj *timeline; |
| 713 | int fd_out; |
| 714 | struct goldfish_sync_ioctl_info ioctl_data; |
| 715 | |
| 716 | DTRACE(); |
| 717 | |
| 718 | sync_context_data = file->private_data; |
| 719 | fd_out = -1; |
| 720 | |
| 721 | switch (cmd) { |
| 722 | case GOLDFISH_SYNC_IOC_QUEUE_WORK: |
| 723 | |
| 724 | DPRINT("exec GOLDFISH_SYNC_IOC_QUEUE_WORK"); |
| 725 | |
| 726 | mutex_lock(&global_sync_state->mutex_lock); |
| 727 | |
| 728 | if (copy_from_user(&ioctl_data, |
| 729 | (void __user *)arg, |
| 730 | sizeof(ioctl_data))) { |
| 731 | ERR("Failed to copy memory for ioctl_data from user."); |
| 732 | mutex_unlock(&global_sync_state->mutex_lock); |
| 733 | return -EFAULT; |
| 734 | } |
| 735 | |
| 736 | if (ioctl_data.host_syncthread_handle_in == 0) { |
| 737 | DPRINT("Error: zero host syncthread handle!!!"); |
| 738 | mutex_unlock(&global_sync_state->mutex_lock); |
| 739 | return -EFAULT; |
| 740 | } |
| 741 | |
| 742 | if (!sync_context_data->timeline) { |
| 743 | DPRINT("no timeline yet, create one."); |
| 744 | sync_context_data->timeline = goldfish_sync_timeline_create(); |
| 745 | DPRINT("timeline: 0x%p", &sync_context_data->timeline); |
| 746 | } |
| 747 | |
| 748 | timeline = sync_context_data->timeline; |
| 749 | fd_out = goldfish_sync_fence_create(timeline, |
| 750 | timeline->current_time + 1); |
| 751 | DPRINT("Created fence with fd %d and current time %u (timeline: 0x%p)", |
| 752 | fd_out, |
| 753 | sync_context_data->timeline->current_time + 1, |
| 754 | sync_context_data->timeline); |
| 755 | |
| 756 | ioctl_data.fence_fd_out = fd_out; |
| 757 | |
| 758 | if (copy_to_user((void __user *)arg, |
| 759 | &ioctl_data, |
| 760 | sizeof(ioctl_data))) { |
| 761 | DPRINT("Error, could not copy to user!!!"); |
| 762 | |
| 763 | sys_close(fd_out); |
| 764 | /* We won't be doing an increment, kref_put immediately. */ |
| 765 | kref_put(&timeline->kref, delete_timeline_obj); |
| 766 | mutex_unlock(&global_sync_state->mutex_lock); |
| 767 | return -EFAULT; |
| 768 | } |
| 769 | |
| 770 | /* We are now about to trigger a host-side wait; |
| 771 | * accumulate on |pending_waits|. */ |
| 772 | goldfish_sync_send_guestcmd(global_sync_state, |
| 773 | CMD_TRIGGER_HOST_WAIT, |
| 774 | ioctl_data.host_glsync_handle_in, |
| 775 | ioctl_data.host_syncthread_handle_in, |
| 776 | (uint64_t)(uintptr_t)(sync_context_data->timeline)); |
| 777 | |
| 778 | mutex_unlock(&global_sync_state->mutex_lock); |
| 779 | return 0; |
| 780 | default: |
| 781 | return -ENOTTY; |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | static const struct file_operations goldfish_sync_fops = { |
| 786 | .owner = THIS_MODULE, |
| 787 | .open = goldfish_sync_open, |
| 788 | .release = goldfish_sync_release, |
| 789 | .unlocked_ioctl = goldfish_sync_ioctl, |
| 790 | .compat_ioctl = goldfish_sync_ioctl, |
| 791 | }; |
| 792 | |
| 793 | static struct miscdevice goldfish_sync_device = { |
| 794 | .name = "goldfish_sync", |
| 795 | .fops = &goldfish_sync_fops, |
| 796 | }; |
| 797 | |
| 798 | |
| 799 | static bool setup_verify_batch_cmd_addr(struct goldfish_sync_state *sync_state, |
| 800 | void *batch_addr, |
| 801 | uint32_t addr_offset, |
| 802 | uint32_t addr_offset_high) |
| 803 | { |
| 804 | uint64_t batch_addr_phys; |
| 805 | uint32_t batch_addr_phys_test_lo; |
| 806 | uint32_t batch_addr_phys_test_hi; |
| 807 | |
| 808 | if (!batch_addr) { |
| 809 | ERR("Could not use batch command address!"); |
| 810 | return false; |
| 811 | } |
| 812 | |
| 813 | batch_addr_phys = virt_to_phys(batch_addr); |
| 814 | writel((uint32_t)(batch_addr_phys), |
| 815 | sync_state->reg_base + addr_offset); |
| 816 | writel((uint32_t)(batch_addr_phys >> 32), |
| 817 | sync_state->reg_base + addr_offset_high); |
| 818 | |
| 819 | batch_addr_phys_test_lo = |
| 820 | readl(sync_state->reg_base + addr_offset); |
| 821 | batch_addr_phys_test_hi = |
| 822 | readl(sync_state->reg_base + addr_offset_high); |
| 823 | |
| 824 | if (virt_to_phys(batch_addr) != |
| 825 | (((uint64_t)batch_addr_phys_test_hi << 32) | |
| 826 | batch_addr_phys_test_lo)) { |
| 827 | ERR("Invalid batch command address!"); |
| 828 | return false; |
| 829 | } |
| 830 | |
| 831 | return true; |
| 832 | } |
| 833 | |
| 834 | int goldfish_sync_probe(struct platform_device *pdev) |
| 835 | { |
| 836 | struct resource *ioresource; |
| 837 | struct goldfish_sync_state *sync_state = global_sync_state; |
| 838 | int status; |
| 839 | |
| 840 | DTRACE(); |
| 841 | |
| 842 | sync_state->to_do_end = 0; |
| 843 | |
| 844 | spin_lock_init(&sync_state->lock); |
| 845 | mutex_init(&sync_state->mutex_lock); |
| 846 | |
| 847 | platform_set_drvdata(pdev, sync_state); |
| 848 | |
| 849 | ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 850 | if (ioresource == NULL) { |
| 851 | ERR("platform_get_resource failed"); |
| 852 | return -ENODEV; |
| 853 | } |
| 854 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 855 | sync_state->reg_base = |
| 856 | devm_ioremap(&pdev->dev, ioresource->start, PAGE_SIZE); |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 857 | if (sync_state->reg_base == NULL) { |
| 858 | ERR("Could not ioremap"); |
| 859 | return -ENOMEM; |
| 860 | } |
| 861 | |
| 862 | sync_state->irq = platform_get_irq(pdev, 0); |
| 863 | if (sync_state->irq < 0) { |
| 864 | ERR("Could not platform_get_irq"); |
| 865 | return -ENODEV; |
| 866 | } |
| 867 | |
| 868 | status = devm_request_irq(&pdev->dev, |
| 869 | sync_state->irq, |
| 870 | goldfish_sync_interrupt, |
| 871 | IRQF_SHARED, |
| 872 | pdev->name, |
| 873 | sync_state); |
| 874 | if (status) { |
| 875 | ERR("request_irq failed"); |
| 876 | return -ENODEV; |
| 877 | } |
| 878 | |
| 879 | INIT_WORK(&sync_state->work_item, |
| 880 | goldfish_sync_work_item_fn); |
| 881 | |
| 882 | misc_register(&goldfish_sync_device); |
| 883 | |
| 884 | /* Obtain addresses for batch send/recv of commands. */ |
| 885 | { |
| 886 | struct goldfish_sync_hostcmd *batch_addr_hostcmd; |
| 887 | struct goldfish_sync_guestcmd *batch_addr_guestcmd; |
| 888 | |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 889 | batch_addr_hostcmd = |
| 890 | devm_kzalloc(&pdev->dev, sizeof(struct goldfish_sync_hostcmd), |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 891 | GFP_KERNEL); |
Lingfeng Yang | 1cbd16b | 2017-01-31 23:28:39 -0800 | [diff] [blame] | 892 | batch_addr_guestcmd = |
| 893 | devm_kzalloc(&pdev->dev, sizeof(struct goldfish_sync_guestcmd), |
Lingfeng Yang | a50f1db | 2016-06-13 09:24:07 -0700 | [diff] [blame] | 894 | GFP_KERNEL); |
| 895 | |
| 896 | if (!setup_verify_batch_cmd_addr(sync_state, |
| 897 | batch_addr_hostcmd, |
| 898 | SYNC_REG_BATCH_COMMAND_ADDR, |
| 899 | SYNC_REG_BATCH_COMMAND_ADDR_HIGH)) { |
| 900 | ERR("goldfish_sync: Could not setup batch command address"); |
| 901 | return -ENODEV; |
| 902 | } |
| 903 | |
| 904 | if (!setup_verify_batch_cmd_addr(sync_state, |
| 905 | batch_addr_guestcmd, |
| 906 | SYNC_REG_BATCH_GUESTCOMMAND_ADDR, |
| 907 | SYNC_REG_BATCH_GUESTCOMMAND_ADDR_HIGH)) { |
| 908 | ERR("goldfish_sync: Could not setup batch guest command address"); |
| 909 | return -ENODEV; |
| 910 | } |
| 911 | |
| 912 | sync_state->batch_hostcmd = batch_addr_hostcmd; |
| 913 | sync_state->batch_guestcmd = batch_addr_guestcmd; |
| 914 | } |
| 915 | |
| 916 | INFO("goldfish_sync: Initialized goldfish sync device"); |
| 917 | |
| 918 | writel(0, sync_state->reg_base + SYNC_REG_INIT); |
| 919 | |
| 920 | return 0; |
| 921 | } |
| 922 | |
| 923 | static int goldfish_sync_remove(struct platform_device *pdev) |
| 924 | { |
| 925 | struct goldfish_sync_state *sync_state = global_sync_state; |
| 926 | |
| 927 | DTRACE(); |
| 928 | |
| 929 | misc_deregister(&goldfish_sync_device); |
| 930 | memset(sync_state, 0, sizeof(struct goldfish_sync_state)); |
| 931 | return 0; |
| 932 | } |
| 933 | |
| 934 | static const struct of_device_id goldfish_sync_of_match[] = { |
| 935 | { .compatible = "google,goldfish-sync", }, |
| 936 | {}, |
| 937 | }; |
| 938 | MODULE_DEVICE_TABLE(of, goldfish_sync_of_match); |
| 939 | |
| 940 | static const struct acpi_device_id goldfish_sync_acpi_match[] = { |
| 941 | { "GFSH0006", 0 }, |
| 942 | { }, |
| 943 | }; |
| 944 | |
| 945 | MODULE_DEVICE_TABLE(acpi, goldfish_sync_acpi_match); |
| 946 | |
| 947 | static struct platform_driver goldfish_sync = { |
| 948 | .probe = goldfish_sync_probe, |
| 949 | .remove = goldfish_sync_remove, |
| 950 | .driver = { |
| 951 | .name = "goldfish_sync", |
| 952 | .of_match_table = goldfish_sync_of_match, |
| 953 | .acpi_match_table = ACPI_PTR(goldfish_sync_acpi_match), |
| 954 | } |
| 955 | }; |
| 956 | |
| 957 | module_platform_driver(goldfish_sync); |
| 958 | |
| 959 | MODULE_AUTHOR("Google, Inc."); |
| 960 | MODULE_DESCRIPTION("Android QEMU Sync Driver"); |
| 961 | MODULE_LICENSE("GPL"); |
| 962 | MODULE_VERSION("1.0"); |