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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2017-2018, Intel Corporation | |
4 | */ | |
5 | ||
6 | #include <linux/completion.h> | |
7 | #include <linux/delay.h> | |
8 | #include <linux/genalloc.h> | |
9 | #include <linux/io.h> | |
10 | #include <linux/kfifo.h> | |
11 | #include <linux/kthread.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/mutex.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/of_platform.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/firmware/intel/stratix10-smc.h> | |
20 | #include <linux/firmware/intel/stratix10-svc-client.h> | |
21 | #include <linux/types.h> | |
22 | ||
23 | /** | |
24 | * SVC_NUM_DATA_IN_FIFO - number of struct stratix10_svc_data in the FIFO | |
25 | * | |
26 | * SVC_NUM_CHANNEL - number of channel supported by service layer driver | |
27 | * | |
28 | * FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS - claim back the submitted buffer(s) | |
29 | * from the secure world for FPGA manager to reuse, or to free the buffer(s) | |
30 | * when all bit-stream data had be send. | |
31 | * | |
32 | * FPGA_CONFIG_STATUS_TIMEOUT_SEC - poll the FPGA configuration status, | |
33 | * service layer will return error to FPGA manager when timeout occurs, | |
34 | * timeout is set to 30 seconds (30 * 1000) at Intel Stratix10 SoC. | |
35 | */ | |
36 | #define SVC_NUM_DATA_IN_FIFO 32 | |
37 | #define SVC_NUM_CHANNEL 1 | |
38 | #define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS 200 | |
39 | #define FPGA_CONFIG_STATUS_TIMEOUT_SEC 30 | |
40 | ||
41 | typedef void (svc_invoke_fn)(unsigned long, unsigned long, unsigned long, | |
42 | unsigned long, unsigned long, unsigned long, | |
43 | unsigned long, unsigned long, | |
44 | struct arm_smccc_res *); | |
45 | struct stratix10_svc_chan; | |
46 | ||
47 | /** | |
48 | * struct stratix10_svc_sh_memory - service shared memory structure | |
49 | * @sync_complete: state for a completion | |
50 | * @addr: physical address of shared memory block | |
51 | * @size: size of shared memory block | |
52 | * @invoke_fn: function to issue secure monitor or hypervisor call | |
53 | * | |
54 | * This struct is used to save physical address and size of shared memory | |
55 | * block. The shared memory blocked is allocated by secure monitor software | |
56 | * at secure world. | |
57 | * | |
58 | * Service layer driver uses the physical address and size to create a memory | |
59 | * pool, then allocates data buffer from that memory pool for service client. | |
60 | */ | |
61 | struct stratix10_svc_sh_memory { | |
62 | struct completion sync_complete; | |
63 | unsigned long addr; | |
64 | unsigned long size; | |
65 | svc_invoke_fn *invoke_fn; | |
66 | }; | |
67 | ||
68 | /** | |
69 | * struct stratix10_svc_data_mem - service memory structure | |
70 | * @vaddr: virtual address | |
71 | * @paddr: physical address | |
72 | * @size: size of memory | |
73 | * @node: link list head node | |
74 | * | |
75 | * This struct is used in a list that keeps track of buffers which have | |
76 | * been allocated or freed from the memory pool. Service layer driver also | |
77 | * uses this struct to transfer physical address to virtual address. | |
78 | */ | |
79 | struct stratix10_svc_data_mem { | |
80 | void *vaddr; | |
81 | phys_addr_t paddr; | |
82 | size_t size; | |
83 | struct list_head node; | |
84 | }; | |
85 | ||
86 | /** | |
87 | * struct stratix10_svc_data - service data structure | |
88 | * @chan: service channel | |
89 | * @paddr: playload physical address | |
90 | * @size: playload size | |
91 | * @command: service command requested by client | |
92 | * @flag: configuration type (full or partial) | |
93 | * @arg: args to be passed via registers and not physically mapped buffers | |
94 | * | |
95 | * This struct is used in service FIFO for inter-process communication. | |
96 | */ | |
97 | struct stratix10_svc_data { | |
98 | struct stratix10_svc_chan *chan; | |
99 | phys_addr_t paddr; | |
100 | size_t size; | |
101 | u32 command; | |
102 | u32 flag; | |
103 | u64 arg[3]; | |
104 | }; | |
105 | ||
106 | /** | |
107 | * struct stratix10_svc_controller - service controller | |
108 | * @dev: device | |
109 | * @chans: array of service channels | |
110 | * @num_chans: number of channels in 'chans' array | |
111 | * @num_active_client: number of active service client | |
112 | * @node: list management | |
113 | * @genpool: memory pool pointing to the memory region | |
114 | * @task: pointer to the thread task which handles SMC or HVC call | |
115 | * @svc_fifo: a queue for storing service message data | |
116 | * @complete_status: state for completion | |
117 | * @svc_fifo_lock: protect access to service message data queue | |
118 | * @invoke_fn: function to issue secure monitor call or hypervisor call | |
119 | * | |
120 | * This struct is used to create communication channels for service clients, to | |
121 | * handle secure monitor or hypervisor call. | |
122 | */ | |
123 | struct stratix10_svc_controller { | |
124 | struct device *dev; | |
125 | struct stratix10_svc_chan *chans; | |
126 | int num_chans; | |
127 | int num_active_client; | |
128 | struct list_head node; | |
129 | struct gen_pool *genpool; | |
130 | struct task_struct *task; | |
131 | struct kfifo svc_fifo; | |
132 | struct completion complete_status; | |
133 | spinlock_t svc_fifo_lock; | |
134 | svc_invoke_fn *invoke_fn; | |
135 | }; | |
136 | ||
137 | /** | |
138 | * struct stratix10_svc_chan - service communication channel | |
139 | * @ctrl: pointer to service controller which is the provider of this channel | |
140 | * @scl: pointer to service client which owns the channel | |
141 | * @name: service client name associated with the channel | |
142 | * @lock: protect access to the channel | |
143 | * | |
144 | * This struct is used by service client to communicate with service layer, each | |
145 | * service client has its own channel created by service controller. | |
146 | */ | |
147 | struct stratix10_svc_chan { | |
148 | struct stratix10_svc_controller *ctrl; | |
149 | struct stratix10_svc_client *scl; | |
150 | char *name; | |
151 | spinlock_t lock; | |
152 | }; | |
153 | ||
154 | static LIST_HEAD(svc_ctrl); | |
155 | static LIST_HEAD(svc_data_mem); | |
156 | ||
157 | /** | |
158 | * svc_pa_to_va() - translate physical address to virtual address | |
159 | * @addr: to be translated physical address | |
160 | * | |
161 | * Return: valid virtual address or NULL if the provided physical | |
162 | * address doesn't exist. | |
163 | */ | |
164 | static void *svc_pa_to_va(unsigned long addr) | |
165 | { | |
166 | struct stratix10_svc_data_mem *pmem; | |
167 | ||
168 | pr_debug("claim back P-addr=0x%016x\n", (unsigned int)addr); | |
169 | list_for_each_entry(pmem, &svc_data_mem, node) | |
170 | if (pmem->paddr == addr) | |
171 | return pmem->vaddr; | |
172 | ||
173 | /* physical address is not found */ | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | /** | |
178 | * svc_thread_cmd_data_claim() - claim back buffer from the secure world | |
179 | * @ctrl: pointer to service layer controller | |
180 | * @p_data: pointer to service data structure | |
181 | * @cb_data: pointer to callback data structure to service client | |
182 | * | |
183 | * Claim back the submitted buffers from the secure world and pass buffer | |
184 | * back to service client (FPGA manager, etc) for reuse. | |
185 | */ | |
186 | static void svc_thread_cmd_data_claim(struct stratix10_svc_controller *ctrl, | |
187 | struct stratix10_svc_data *p_data, | |
188 | struct stratix10_svc_cb_data *cb_data) | |
189 | { | |
190 | struct arm_smccc_res res; | |
191 | unsigned long timeout; | |
192 | ||
193 | reinit_completion(&ctrl->complete_status); | |
194 | timeout = msecs_to_jiffies(FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS); | |
195 | ||
196 | pr_debug("%s: claim back the submitted buffer\n", __func__); | |
197 | do { | |
198 | ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_COMPLETED_WRITE, | |
199 | 0, 0, 0, 0, 0, 0, 0, &res); | |
200 | ||
201 | if (res.a0 == INTEL_SIP_SMC_STATUS_OK) { | |
202 | if (!res.a1) { | |
203 | complete(&ctrl->complete_status); | |
204 | break; | |
205 | } | |
206 | cb_data->status = BIT(SVC_STATUS_RECONFIG_BUFFER_DONE); | |
207 | cb_data->kaddr1 = svc_pa_to_va(res.a1); | |
208 | cb_data->kaddr2 = (res.a2) ? | |
209 | svc_pa_to_va(res.a2) : NULL; | |
210 | cb_data->kaddr3 = (res.a3) ? | |
211 | svc_pa_to_va(res.a3) : NULL; | |
212 | p_data->chan->scl->receive_cb(p_data->chan->scl, | |
213 | cb_data); | |
214 | } else { | |
215 | pr_debug("%s: secure world busy, polling again\n", | |
216 | __func__); | |
217 | } | |
218 | } while (res.a0 == INTEL_SIP_SMC_STATUS_OK || | |
219 | res.a0 == INTEL_SIP_SMC_FPGA_CONFIG_STATUS_BUSY || | |
220 | wait_for_completion_timeout(&ctrl->complete_status, timeout)); | |
221 | } | |
222 | ||
223 | /** | |
224 | * svc_thread_cmd_config_status() - check configuration status | |
225 | * @ctrl: pointer to service layer controller | |
226 | * @p_data: pointer to service data structure | |
227 | * @cb_data: pointer to callback data structure to service client | |
228 | * | |
229 | * Check whether the secure firmware at secure world has finished the FPGA | |
230 | * configuration, and then inform FPGA manager the configuration status. | |
231 | */ | |
232 | static void svc_thread_cmd_config_status(struct stratix10_svc_controller *ctrl, | |
233 | struct stratix10_svc_data *p_data, | |
234 | struct stratix10_svc_cb_data *cb_data) | |
235 | { | |
236 | struct arm_smccc_res res; | |
237 | int count_in_sec; | |
238 | ||
239 | cb_data->kaddr1 = NULL; | |
240 | cb_data->kaddr2 = NULL; | |
241 | cb_data->kaddr3 = NULL; | |
242 | cb_data->status = BIT(SVC_STATUS_RECONFIG_ERROR); | |
243 | ||
244 | pr_debug("%s: polling config status\n", __func__); | |
245 | ||
246 | count_in_sec = FPGA_CONFIG_STATUS_TIMEOUT_SEC; | |
247 | while (count_in_sec) { | |
248 | ctrl->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_ISDONE, | |
249 | 0, 0, 0, 0, 0, 0, 0, &res); | |
250 | if ((res.a0 == INTEL_SIP_SMC_STATUS_OK) || | |
251 | (res.a0 == INTEL_SIP_SMC_FPGA_CONFIG_STATUS_ERROR)) | |
252 | break; | |
253 | ||
254 | /* | |
255 | * configuration is still in progress, wait one second then | |
256 | * poll again | |
257 | */ | |
258 | msleep(1000); | |
259 | count_in_sec--; | |
260 | }; | |
261 | ||
262 | if (res.a0 == INTEL_SIP_SMC_STATUS_OK && count_in_sec) | |
263 | cb_data->status = BIT(SVC_STATUS_RECONFIG_COMPLETED); | |
264 | ||
265 | p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data); | |
266 | } | |
267 | ||
268 | /** | |
269 | * svc_thread_recv_status_ok() - handle the successful status | |
270 | * @p_data: pointer to service data structure | |
271 | * @cb_data: pointer to callback data structure to service client | |
272 | * @res: result from SMC or HVC call | |
273 | * | |
274 | * Send back the correspond status to the service client (FPGA manager etc). | |
275 | */ | |
276 | static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data, | |
277 | struct stratix10_svc_cb_data *cb_data, | |
278 | struct arm_smccc_res res) | |
279 | { | |
280 | cb_data->kaddr1 = NULL; | |
281 | cb_data->kaddr2 = NULL; | |
282 | cb_data->kaddr3 = NULL; | |
283 | ||
284 | switch (p_data->command) { | |
285 | case COMMAND_RECONFIG: | |
286 | cb_data->status = BIT(SVC_STATUS_RECONFIG_REQUEST_OK); | |
287 | break; | |
288 | case COMMAND_RECONFIG_DATA_SUBMIT: | |
289 | cb_data->status = BIT(SVC_STATUS_RECONFIG_BUFFER_SUBMITTED); | |
290 | break; | |
291 | case COMMAND_NOOP: | |
292 | cb_data->status = BIT(SVC_STATUS_RECONFIG_BUFFER_SUBMITTED); | |
293 | cb_data->kaddr1 = svc_pa_to_va(res.a1); | |
294 | break; | |
295 | case COMMAND_RECONFIG_STATUS: | |
296 | cb_data->status = BIT(SVC_STATUS_RECONFIG_COMPLETED); | |
297 | break; | |
298 | default: | |
299 | pr_warn("it shouldn't happen\n"); | |
300 | break; | |
301 | } | |
302 | ||
303 | pr_debug("%s: call receive_cb\n", __func__); | |
304 | p_data->chan->scl->receive_cb(p_data->chan->scl, cb_data); | |
305 | } | |
306 | ||
307 | /** | |
308 | * svc_normal_to_secure_thread() - the function to run in the kthread | |
309 | * @data: data pointer for kthread function | |
310 | * | |
311 | * Service layer driver creates stratix10_svc_smc_hvc_call kthread on CPU | |
312 | * node 0, its function stratix10_svc_secure_call_thread is used to handle | |
313 | * SMC or HVC calls between kernel driver and secure monitor software. | |
314 | * | |
315 | * Return: 0 for success or -ENOMEM on error. | |
316 | */ | |
317 | static int svc_normal_to_secure_thread(void *data) | |
318 | { | |
319 | struct stratix10_svc_controller | |
320 | *ctrl = (struct stratix10_svc_controller *)data; | |
321 | struct stratix10_svc_data *pdata; | |
322 | struct stratix10_svc_cb_data *cbdata; | |
323 | struct arm_smccc_res res; | |
324 | unsigned long a0, a1, a2; | |
325 | int ret_fifo = 0; | |
326 | ||
327 | pdata = kmalloc(sizeof(*pdata), GFP_KERNEL); | |
328 | if (!pdata) | |
329 | return -ENOMEM; | |
330 | ||
331 | cbdata = kmalloc(sizeof(*cbdata), GFP_KERNEL); | |
332 | if (!cbdata) { | |
333 | kfree(pdata); | |
334 | return -ENOMEM; | |
335 | } | |
336 | ||
337 | /* default set, to remove build warning */ | |
338 | a0 = INTEL_SIP_SMC_FPGA_CONFIG_LOOPBACK; | |
339 | a1 = 0; | |
340 | a2 = 0; | |
341 | ||
342 | pr_debug("smc_hvc_shm_thread is running\n"); | |
343 | ||
344 | while (!kthread_should_stop()) { | |
345 | ret_fifo = kfifo_out_spinlocked(&ctrl->svc_fifo, | |
346 | pdata, sizeof(*pdata), | |
347 | &ctrl->svc_fifo_lock); | |
348 | ||
349 | if (!ret_fifo) | |
350 | continue; | |
351 | ||
352 | pr_debug("get from FIFO pa=0x%016x, command=%u, size=%u\n", | |
353 | (unsigned int)pdata->paddr, pdata->command, | |
354 | (unsigned int)pdata->size); | |
355 | ||
356 | switch (pdata->command) { | |
357 | case COMMAND_RECONFIG_DATA_CLAIM: | |
358 | svc_thread_cmd_data_claim(ctrl, pdata, cbdata); | |
359 | continue; | |
360 | case COMMAND_RECONFIG: | |
361 | a0 = INTEL_SIP_SMC_FPGA_CONFIG_START; | |
362 | pr_debug("conf_type=%u\n", (unsigned int)pdata->flag); | |
363 | a1 = pdata->flag; | |
364 | a2 = 0; | |
365 | break; | |
366 | case COMMAND_RECONFIG_DATA_SUBMIT: | |
367 | a0 = INTEL_SIP_SMC_FPGA_CONFIG_WRITE; | |
368 | a1 = (unsigned long)pdata->paddr; | |
369 | a2 = (unsigned long)pdata->size; | |
370 | break; | |
371 | case COMMAND_RECONFIG_STATUS: | |
372 | a0 = INTEL_SIP_SMC_FPGA_CONFIG_ISDONE; | |
373 | a1 = 0; | |
374 | a2 = 0; | |
375 | break; | |
376 | default: | |
377 | pr_warn("it shouldn't happen\n"); | |
378 | break; | |
379 | } | |
380 | pr_debug("%s: before SMC call -- a0=0x%016x a1=0x%016x", | |
381 | __func__, (unsigned int)a0, (unsigned int)a1); | |
382 | pr_debug(" a2=0x%016x\n", (unsigned int)a2); | |
383 | ||
384 | ctrl->invoke_fn(a0, a1, a2, 0, 0, 0, 0, 0, &res); | |
385 | ||
386 | pr_debug("%s: after SMC call -- res.a0=0x%016x", | |
387 | __func__, (unsigned int)res.a0); | |
388 | pr_debug(" res.a1=0x%016x, res.a2=0x%016x", | |
389 | (unsigned int)res.a1, (unsigned int)res.a2); | |
390 | pr_debug(" res.a3=0x%016x\n", (unsigned int)res.a3); | |
391 | ||
392 | switch (res.a0) { | |
393 | case INTEL_SIP_SMC_STATUS_OK: | |
394 | svc_thread_recv_status_ok(pdata, cbdata, res); | |
395 | break; | |
396 | case INTEL_SIP_SMC_FPGA_CONFIG_STATUS_BUSY: | |
397 | switch (pdata->command) { | |
398 | case COMMAND_RECONFIG_DATA_SUBMIT: | |
399 | svc_thread_cmd_data_claim(ctrl, | |
400 | pdata, cbdata); | |
401 | break; | |
402 | case COMMAND_RECONFIG_STATUS: | |
403 | svc_thread_cmd_config_status(ctrl, | |
404 | pdata, cbdata); | |
405 | break; | |
406 | default: | |
407 | pr_warn("it shouldn't happen\n"); | |
408 | break; | |
409 | } | |
410 | break; | |
411 | case INTEL_SIP_SMC_FPGA_CONFIG_STATUS_REJECTED: | |
412 | pr_debug("%s: STATUS_REJECTED\n", __func__); | |
413 | break; | |
414 | case INTEL_SIP_SMC_FPGA_CONFIG_STATUS_ERROR: | |
415 | pr_err("%s: STATUS_ERROR\n", __func__); | |
416 | cbdata->status = BIT(SVC_STATUS_RECONFIG_ERROR); | |
417 | cbdata->kaddr1 = NULL; | |
418 | cbdata->kaddr2 = NULL; | |
419 | cbdata->kaddr3 = NULL; | |
420 | pdata->chan->scl->receive_cb(pdata->chan->scl, cbdata); | |
421 | break; | |
422 | default: | |
423 | pr_warn("it shouldn't happen\n"); | |
424 | break; | |
425 | } | |
426 | }; | |
427 | ||
428 | kfree(cbdata); | |
429 | kfree(pdata); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | /** | |
435 | * svc_normal_to_secure_shm_thread() - the function to run in the kthread | |
436 | * @data: data pointer for kthread function | |
437 | * | |
438 | * Service layer driver creates stratix10_svc_smc_hvc_shm kthread on CPU | |
439 | * node 0, its function stratix10_svc_secure_shm_thread is used to query the | |
440 | * physical address of memory block reserved by secure monitor software at | |
441 | * secure world. | |
442 | * | |
443 | * svc_normal_to_secure_shm_thread() calls do_exit() directly since it is a | |
444 | * standlone thread for which no one will call kthread_stop() or return when | |
445 | * 'kthread_should_stop()' is true. | |
446 | */ | |
447 | static int svc_normal_to_secure_shm_thread(void *data) | |
448 | { | |
449 | struct stratix10_svc_sh_memory | |
450 | *sh_mem = (struct stratix10_svc_sh_memory *)data; | |
451 | struct arm_smccc_res res; | |
452 | ||
453 | /* SMC or HVC call to get shared memory info from secure world */ | |
454 | sh_mem->invoke_fn(INTEL_SIP_SMC_FPGA_CONFIG_GET_MEM, | |
455 | 0, 0, 0, 0, 0, 0, 0, &res); | |
456 | if (res.a0 == INTEL_SIP_SMC_STATUS_OK) { | |
457 | sh_mem->addr = res.a1; | |
458 | sh_mem->size = res.a2; | |
459 | } else { | |
460 | pr_err("%s: after SMC call -- res.a0=0x%016x", __func__, | |
461 | (unsigned int)res.a0); | |
462 | sh_mem->addr = 0; | |
463 | sh_mem->size = 0; | |
464 | } | |
465 | ||
466 | complete(&sh_mem->sync_complete); | |
467 | do_exit(0); | |
468 | } | |
469 | ||
470 | /** | |
471 | * svc_get_sh_memory() - get memory block reserved by secure monitor SW | |
472 | * @pdev: pointer to service layer device | |
473 | * @sh_memory: pointer to service shared memory structure | |
474 | * | |
475 | * Return: zero for successfully getting the physical address of memory block | |
476 | * reserved by secure monitor software, or negative value on error. | |
477 | */ | |
478 | static int svc_get_sh_memory(struct platform_device *pdev, | |
479 | struct stratix10_svc_sh_memory *sh_memory) | |
480 | { | |
481 | struct device *dev = &pdev->dev; | |
482 | struct task_struct *sh_memory_task; | |
483 | unsigned int cpu = 0; | |
484 | ||
485 | init_completion(&sh_memory->sync_complete); | |
486 | ||
487 | /* smc or hvc call happens on cpu 0 bound kthread */ | |
488 | sh_memory_task = kthread_create_on_node(svc_normal_to_secure_shm_thread, | |
489 | (void *)sh_memory, | |
490 | cpu_to_node(cpu), | |
491 | "svc_smc_hvc_shm_thread"); | |
492 | if (IS_ERR(sh_memory_task)) { | |
493 | dev_err(dev, "fail to create stratix10_svc_smc_shm_thread\n"); | |
494 | return -EINVAL; | |
495 | } | |
496 | ||
497 | wake_up_process(sh_memory_task); | |
498 | ||
499 | if (!wait_for_completion_timeout(&sh_memory->sync_complete, 10 * HZ)) { | |
500 | dev_err(dev, | |
501 | "timeout to get sh-memory paras from secure world\n"); | |
502 | return -ETIMEDOUT; | |
503 | } | |
504 | ||
505 | if (!sh_memory->addr || !sh_memory->size) { | |
506 | dev_err(dev, | |
507 | "fails to get shared memory info from secure world\n"); | |
508 | return -ENOMEM; | |
509 | } | |
510 | ||
511 | dev_dbg(dev, "SM software provides paddr: 0x%016x, size: 0x%08x\n", | |
512 | (unsigned int)sh_memory->addr, | |
513 | (unsigned int)sh_memory->size); | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | /** | |
519 | * svc_create_memory_pool() - create a memory pool from reserved memory block | |
520 | * @pdev: pointer to service layer device | |
521 | * @sh_memory: pointer to service shared memory structure | |
522 | * | |
523 | * Return: pool allocated from reserved memory block or ERR_PTR() on error. | |
524 | */ | |
525 | static struct gen_pool * | |
526 | svc_create_memory_pool(struct platform_device *pdev, | |
527 | struct stratix10_svc_sh_memory *sh_memory) | |
528 | { | |
529 | struct device *dev = &pdev->dev; | |
530 | struct gen_pool *genpool; | |
531 | unsigned long vaddr; | |
532 | phys_addr_t paddr; | |
533 | size_t size; | |
534 | phys_addr_t begin; | |
535 | phys_addr_t end; | |
536 | void *va; | |
537 | size_t page_mask = PAGE_SIZE - 1; | |
538 | int min_alloc_order = 3; | |
539 | int ret; | |
540 | ||
541 | begin = roundup(sh_memory->addr, PAGE_SIZE); | |
542 | end = rounddown(sh_memory->addr + sh_memory->size, PAGE_SIZE); | |
543 | paddr = begin; | |
544 | size = end - begin; | |
545 | va = memremap(paddr, size, MEMREMAP_WC); | |
546 | if (!va) { | |
547 | dev_err(dev, "fail to remap shared memory\n"); | |
548 | return ERR_PTR(-EINVAL); | |
549 | } | |
550 | vaddr = (unsigned long)va; | |
551 | dev_dbg(dev, | |
552 | "reserved memory vaddr: %p, paddr: 0x%16x size: 0x%8x\n", | |
553 | va, (unsigned int)paddr, (unsigned int)size); | |
554 | if ((vaddr & page_mask) || (paddr & page_mask) || | |
555 | (size & page_mask)) { | |
556 | dev_err(dev, "page is not aligned\n"); | |
557 | return ERR_PTR(-EINVAL); | |
558 | } | |
559 | genpool = gen_pool_create(min_alloc_order, -1); | |
560 | if (!genpool) { | |
561 | dev_err(dev, "fail to create genpool\n"); | |
562 | return ERR_PTR(-ENOMEM); | |
563 | } | |
564 | gen_pool_set_algo(genpool, gen_pool_best_fit, NULL); | |
565 | ret = gen_pool_add_virt(genpool, vaddr, paddr, size, -1); | |
566 | if (ret) { | |
567 | dev_err(dev, "fail to add memory chunk to the pool\n"); | |
568 | gen_pool_destroy(genpool); | |
569 | return ERR_PTR(ret); | |
570 | } | |
571 | ||
572 | return genpool; | |
573 | } | |
574 | ||
575 | /** | |
576 | * svc_smccc_smc() - secure monitor call between normal and secure world | |
577 | * @a0: argument passed in registers 0 | |
578 | * @a1: argument passed in registers 1 | |
579 | * @a2: argument passed in registers 2 | |
580 | * @a3: argument passed in registers 3 | |
581 | * @a4: argument passed in registers 4 | |
582 | * @a5: argument passed in registers 5 | |
583 | * @a6: argument passed in registers 6 | |
584 | * @a7: argument passed in registers 7 | |
585 | * @res: result values from register 0 to 3 | |
586 | */ | |
587 | static void svc_smccc_smc(unsigned long a0, unsigned long a1, | |
588 | unsigned long a2, unsigned long a3, | |
589 | unsigned long a4, unsigned long a5, | |
590 | unsigned long a6, unsigned long a7, | |
591 | struct arm_smccc_res *res) | |
592 | { | |
593 | arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res); | |
594 | } | |
595 | ||
596 | /** | |
597 | * svc_smccc_hvc() - hypervisor call between normal and secure world | |
598 | * @a0: argument passed in registers 0 | |
599 | * @a1: argument passed in registers 1 | |
600 | * @a2: argument passed in registers 2 | |
601 | * @a3: argument passed in registers 3 | |
602 | * @a4: argument passed in registers 4 | |
603 | * @a5: argument passed in registers 5 | |
604 | * @a6: argument passed in registers 6 | |
605 | * @a7: argument passed in registers 7 | |
606 | * @res: result values from register 0 to 3 | |
607 | */ | |
608 | static void svc_smccc_hvc(unsigned long a0, unsigned long a1, | |
609 | unsigned long a2, unsigned long a3, | |
610 | unsigned long a4, unsigned long a5, | |
611 | unsigned long a6, unsigned long a7, | |
612 | struct arm_smccc_res *res) | |
613 | { | |
614 | arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res); | |
615 | } | |
616 | ||
617 | /** | |
618 | * get_invoke_func() - invoke SMC or HVC call | |
619 | * @dev: pointer to device | |
620 | * | |
621 | * Return: function pointer to svc_smccc_smc or svc_smccc_hvc. | |
622 | */ | |
623 | static svc_invoke_fn *get_invoke_func(struct device *dev) | |
624 | { | |
625 | const char *method; | |
626 | ||
627 | if (of_property_read_string(dev->of_node, "method", &method)) { | |
628 | dev_warn(dev, "missing \"method\" property\n"); | |
629 | return ERR_PTR(-ENXIO); | |
630 | } | |
631 | ||
632 | if (!strcmp(method, "smc")) | |
633 | return svc_smccc_smc; | |
634 | if (!strcmp(method, "hvc")) | |
635 | return svc_smccc_hvc; | |
636 | ||
637 | dev_warn(dev, "invalid \"method\" property: %s\n", method); | |
638 | ||
639 | return ERR_PTR(-EINVAL); | |
640 | } | |
641 | ||
642 | /** | |
643 | * stratix10_svc_request_channel_byname() - request a service channel | |
644 | * @client: pointer to service client | |
645 | * @name: service client name | |
646 | * | |
647 | * This function is used by service client to request a service channel. | |
648 | * | |
649 | * Return: a pointer to channel assigned to the client on success, | |
650 | * or ERR_PTR() on error. | |
651 | */ | |
652 | struct stratix10_svc_chan *stratix10_svc_request_channel_byname( | |
653 | struct stratix10_svc_client *client, const char *name) | |
654 | { | |
655 | struct device *dev = client->dev; | |
656 | struct stratix10_svc_controller *controller; | |
657 | struct stratix10_svc_chan *chan = NULL; | |
658 | unsigned long flag; | |
659 | int i; | |
660 | ||
661 | /* if probe was called after client's, or error on probe */ | |
662 | if (list_empty(&svc_ctrl)) | |
663 | return ERR_PTR(-EPROBE_DEFER); | |
664 | ||
665 | controller = list_first_entry(&svc_ctrl, | |
666 | struct stratix10_svc_controller, node); | |
667 | for (i = 0; i < SVC_NUM_CHANNEL; i++) { | |
668 | if (!strcmp(controller->chans[i].name, name)) { | |
669 | chan = &controller->chans[i]; | |
670 | break; | |
671 | } | |
672 | } | |
673 | ||
674 | /* if there was no channel match */ | |
675 | if (i == SVC_NUM_CHANNEL) { | |
676 | dev_err(dev, "%s: channel not allocated\n", __func__); | |
677 | return ERR_PTR(-EINVAL); | |
678 | } | |
679 | ||
680 | if (chan->scl || !try_module_get(controller->dev->driver->owner)) { | |
681 | dev_dbg(dev, "%s: svc not free\n", __func__); | |
682 | return ERR_PTR(-EBUSY); | |
683 | } | |
684 | ||
685 | spin_lock_irqsave(&chan->lock, flag); | |
686 | chan->scl = client; | |
687 | chan->ctrl->num_active_client++; | |
688 | spin_unlock_irqrestore(&chan->lock, flag); | |
689 | ||
690 | return chan; | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(stratix10_svc_request_channel_byname); | |
693 | ||
694 | /** | |
695 | * stratix10_svc_free_channel() - free service channel | |
696 | * @chan: service channel to be freed | |
697 | * | |
698 | * This function is used by service client to free a service channel. | |
699 | */ | |
700 | void stratix10_svc_free_channel(struct stratix10_svc_chan *chan) | |
701 | { | |
702 | unsigned long flag; | |
703 | ||
704 | spin_lock_irqsave(&chan->lock, flag); | |
705 | chan->scl = NULL; | |
706 | chan->ctrl->num_active_client--; | |
707 | module_put(chan->ctrl->dev->driver->owner); | |
708 | spin_unlock_irqrestore(&chan->lock, flag); | |
709 | } | |
710 | EXPORT_SYMBOL_GPL(stratix10_svc_free_channel); | |
711 | ||
712 | /** | |
713 | * stratix10_svc_send() - send a message data to the remote | |
714 | * @chan: service channel assigned to the client | |
715 | * @msg: message data to be sent, in the format of | |
716 | * "struct stratix10_svc_client_msg" | |
717 | * | |
718 | * This function is used by service client to add a message to the service | |
719 | * layer driver's queue for being sent to the secure world. | |
720 | * | |
721 | * Return: 0 for success, -ENOMEM or -ENOBUFS on error. | |
722 | */ | |
723 | int stratix10_svc_send(struct stratix10_svc_chan *chan, void *msg) | |
724 | { | |
725 | struct stratix10_svc_client_msg | |
726 | *p_msg = (struct stratix10_svc_client_msg *)msg; | |
727 | struct stratix10_svc_data_mem *p_mem; | |
728 | struct stratix10_svc_data *p_data; | |
729 | int ret = 0; | |
730 | unsigned int cpu = 0; | |
731 | ||
732 | p_data = kzalloc(sizeof(*p_data), GFP_KERNEL); | |
733 | if (!p_data) | |
734 | return -ENOMEM; | |
735 | ||
736 | /* first client will create kernel thread */ | |
737 | if (!chan->ctrl->task) { | |
738 | chan->ctrl->task = | |
739 | kthread_create_on_node(svc_normal_to_secure_thread, | |
740 | (void *)chan->ctrl, | |
741 | cpu_to_node(cpu), | |
742 | "svc_smc_hvc_thread"); | |
743 | if (IS_ERR(chan->ctrl->task)) { | |
744 | dev_err(chan->ctrl->dev, | |
745 | "fails to create svc_smc_hvc_thread\n"); | |
746 | kfree(p_data); | |
747 | return -EINVAL; | |
748 | } | |
749 | kthread_bind(chan->ctrl->task, cpu); | |
750 | wake_up_process(chan->ctrl->task); | |
751 | } | |
752 | ||
753 | pr_debug("%s: sent P-va=%p, P-com=%x, P-size=%u\n", __func__, | |
754 | p_msg->payload, p_msg->command, | |
755 | (unsigned int)p_msg->payload_length); | |
756 | ||
757 | if (list_empty(&svc_data_mem)) { | |
758 | if (p_msg->command == COMMAND_RECONFIG) { | |
759 | struct stratix10_svc_command_config_type *ct = | |
760 | (struct stratix10_svc_command_config_type *) | |
761 | p_msg->payload; | |
762 | p_data->flag = ct->flags; | |
763 | } | |
764 | } else { | |
765 | list_for_each_entry(p_mem, &svc_data_mem, node) | |
766 | if (p_mem->vaddr == p_msg->payload) { | |
767 | p_data->paddr = p_mem->paddr; | |
768 | break; | |
769 | } | |
770 | } | |
771 | ||
772 | p_data->command = p_msg->command; | |
773 | p_data->arg[0] = p_msg->arg[0]; | |
774 | p_data->arg[1] = p_msg->arg[1]; | |
775 | p_data->arg[2] = p_msg->arg[2]; | |
776 | p_data->size = p_msg->payload_length; | |
777 | p_data->chan = chan; | |
778 | pr_debug("%s: put to FIFO pa=0x%016x, cmd=%x, size=%u\n", __func__, | |
779 | (unsigned int)p_data->paddr, p_data->command, | |
780 | (unsigned int)p_data->size); | |
781 | ret = kfifo_in_spinlocked(&chan->ctrl->svc_fifo, p_data, | |
782 | sizeof(*p_data), | |
783 | &chan->ctrl->svc_fifo_lock); | |
784 | ||
785 | kfree(p_data); | |
786 | ||
787 | if (!ret) | |
788 | return -ENOBUFS; | |
789 | ||
790 | return 0; | |
791 | } | |
792 | EXPORT_SYMBOL_GPL(stratix10_svc_send); | |
793 | ||
794 | /** | |
795 | * stratix10_svc_done() - complete service request transactions | |
796 | * @chan: service channel assigned to the client | |
797 | * | |
798 | * This function should be called when client has finished its request | |
799 | * or there is an error in the request process. It allows the service layer | |
800 | * to stop the running thread to have maximize savings in kernel resources. | |
801 | */ | |
802 | void stratix10_svc_done(struct stratix10_svc_chan *chan) | |
803 | { | |
804 | /* stop thread when thread is running AND only one active client */ | |
805 | if (chan->ctrl->task && chan->ctrl->num_active_client <= 1) { | |
806 | pr_debug("svc_smc_hvc_shm_thread is stopped\n"); | |
807 | kthread_stop(chan->ctrl->task); | |
808 | chan->ctrl->task = NULL; | |
809 | } | |
810 | } | |
811 | EXPORT_SYMBOL_GPL(stratix10_svc_done); | |
812 | ||
813 | /** | |
814 | * stratix10_svc_allocate_memory() - allocate memory | |
815 | * @chan: service channel assigned to the client | |
816 | * @size: memory size requested by a specific service client | |
817 | * | |
818 | * Service layer allocates the requested number of bytes buffer from the | |
819 | * memory pool, service client uses this function to get allocated buffers. | |
820 | * | |
821 | * Return: address of allocated memory on success, or ERR_PTR() on error. | |
822 | */ | |
823 | void *stratix10_svc_allocate_memory(struct stratix10_svc_chan *chan, | |
824 | size_t size) | |
825 | { | |
826 | struct stratix10_svc_data_mem *pmem; | |
827 | unsigned long va; | |
828 | phys_addr_t pa; | |
829 | struct gen_pool *genpool = chan->ctrl->genpool; | |
830 | size_t s = roundup(size, 1 << genpool->min_alloc_order); | |
831 | ||
832 | pmem = devm_kzalloc(chan->ctrl->dev, sizeof(*pmem), GFP_KERNEL); | |
833 | if (!pmem) | |
834 | return ERR_PTR(-ENOMEM); | |
835 | ||
836 | va = gen_pool_alloc(genpool, s); | |
837 | if (!va) | |
838 | return ERR_PTR(-ENOMEM); | |
839 | ||
840 | memset((void *)va, 0, s); | |
841 | pa = gen_pool_virt_to_phys(genpool, va); | |
842 | ||
843 | pmem->vaddr = (void *)va; | |
844 | pmem->paddr = pa; | |
845 | pmem->size = s; | |
846 | list_add_tail(&pmem->node, &svc_data_mem); | |
847 | pr_debug("%s: va=%p, pa=0x%016x\n", __func__, | |
848 | pmem->vaddr, (unsigned int)pmem->paddr); | |
849 | ||
850 | return (void *)va; | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(stratix10_svc_allocate_memory); | |
853 | ||
854 | /** | |
855 | * stratix10_svc_free_memory() - free allocated memory | |
856 | * @chan: service channel assigned to the client | |
857 | * @kaddr: memory to be freed | |
858 | * | |
859 | * This function is used by service client to free allocated buffers. | |
860 | */ | |
861 | void stratix10_svc_free_memory(struct stratix10_svc_chan *chan, void *kaddr) | |
862 | { | |
863 | struct stratix10_svc_data_mem *pmem; | |
864 | size_t size = 0; | |
865 | ||
866 | list_for_each_entry(pmem, &svc_data_mem, node) | |
867 | if (pmem->vaddr == kaddr) { | |
868 | size = pmem->size; | |
869 | break; | |
870 | } | |
871 | ||
872 | gen_pool_free(chan->ctrl->genpool, (unsigned long)kaddr, size); | |
873 | pmem->vaddr = NULL; | |
874 | list_del(&pmem->node); | |
875 | } | |
876 | EXPORT_SYMBOL_GPL(stratix10_svc_free_memory); | |
877 | ||
878 | static const struct of_device_id stratix10_svc_drv_match[] = { | |
879 | {.compatible = "intel,stratix10-svc"}, | |
880 | {}, | |
881 | }; | |
882 | ||
883 | static int stratix10_svc_drv_probe(struct platform_device *pdev) | |
884 | { | |
885 | struct device *dev = &pdev->dev; | |
886 | struct stratix10_svc_controller *controller; | |
887 | struct stratix10_svc_chan *chans; | |
888 | struct gen_pool *genpool; | |
889 | struct stratix10_svc_sh_memory *sh_memory; | |
890 | svc_invoke_fn *invoke_fn; | |
891 | size_t fifo_size; | |
892 | int ret; | |
893 | ||
894 | /* get SMC or HVC function */ | |
895 | invoke_fn = get_invoke_func(dev); | |
896 | if (IS_ERR(invoke_fn)) | |
897 | return -EINVAL; | |
898 | ||
899 | sh_memory = devm_kzalloc(dev, sizeof(*sh_memory), GFP_KERNEL); | |
900 | if (!sh_memory) | |
901 | return -ENOMEM; | |
902 | ||
903 | sh_memory->invoke_fn = invoke_fn; | |
904 | ret = svc_get_sh_memory(pdev, sh_memory); | |
905 | if (ret) | |
906 | return ret; | |
907 | ||
908 | genpool = svc_create_memory_pool(pdev, sh_memory); | |
909 | if (!genpool) | |
910 | return -ENOMEM; | |
911 | ||
912 | /* allocate service controller and supporting channel */ | |
913 | controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL); | |
914 | if (!controller) | |
915 | return -ENOMEM; | |
916 | ||
917 | chans = devm_kmalloc_array(dev, SVC_NUM_CHANNEL, | |
918 | sizeof(*chans), GFP_KERNEL | __GFP_ZERO); | |
919 | if (!chans) | |
920 | return -ENOMEM; | |
921 | ||
922 | controller->dev = dev; | |
923 | controller->num_chans = SVC_NUM_CHANNEL; | |
924 | controller->num_active_client = 0; | |
925 | controller->chans = chans; | |
926 | controller->genpool = genpool; | |
927 | controller->task = NULL; | |
928 | controller->invoke_fn = invoke_fn; | |
929 | init_completion(&controller->complete_status); | |
930 | ||
931 | fifo_size = sizeof(struct stratix10_svc_data) * SVC_NUM_DATA_IN_FIFO; | |
932 | ret = kfifo_alloc(&controller->svc_fifo, fifo_size, GFP_KERNEL); | |
933 | if (ret) { | |
934 | dev_err(dev, "fails to allocate FIFO\n"); | |
935 | return ret; | |
936 | } | |
937 | spin_lock_init(&controller->svc_fifo_lock); | |
938 | ||
939 | chans[0].scl = NULL; | |
940 | chans[0].ctrl = controller; | |
941 | chans[0].name = SVC_CLIENT_FPGA; | |
942 | spin_lock_init(&chans[0].lock); | |
943 | ||
944 | list_add_tail(&controller->node, &svc_ctrl); | |
945 | platform_set_drvdata(pdev, controller); | |
946 | ||
947 | pr_info("Intel Service Layer Driver Initialized\n"); | |
948 | ||
949 | return ret; | |
950 | } | |
951 | ||
952 | static int stratix10_svc_drv_remove(struct platform_device *pdev) | |
953 | { | |
954 | struct stratix10_svc_controller *ctrl = platform_get_drvdata(pdev); | |
955 | ||
956 | kfifo_free(&ctrl->svc_fifo); | |
957 | if (ctrl->task) { | |
958 | kthread_stop(ctrl->task); | |
959 | ctrl->task = NULL; | |
960 | } | |
961 | if (ctrl->genpool) | |
962 | gen_pool_destroy(ctrl->genpool); | |
963 | list_del(&ctrl->node); | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
968 | static struct platform_driver stratix10_svc_driver = { | |
969 | .probe = stratix10_svc_drv_probe, | |
970 | .remove = stratix10_svc_drv_remove, | |
971 | .driver = { | |
972 | .name = "stratix10-svc", | |
973 | .of_match_table = stratix10_svc_drv_match, | |
974 | }, | |
975 | }; | |
976 | ||
977 | static int __init stratix10_svc_init(void) | |
978 | { | |
979 | struct device_node *fw_np; | |
980 | struct device_node *np; | |
981 | int ret; | |
982 | ||
983 | fw_np = of_find_node_by_name(NULL, "firmware"); | |
984 | if (!fw_np) | |
985 | return -ENODEV; | |
986 | ||
987 | np = of_find_matching_node(fw_np, stratix10_svc_drv_match); | |
988 | if (!np) { | |
989 | of_node_put(fw_np); | |
990 | return -ENODEV; | |
991 | } | |
992 | ||
993 | of_node_put(np); | |
994 | ret = of_platform_populate(fw_np, stratix10_svc_drv_match, NULL, NULL); | |
995 | of_node_put(fw_np); | |
996 | if (ret) | |
997 | return ret; | |
998 | ||
999 | return platform_driver_register(&stratix10_svc_driver); | |
1000 | } | |
1001 | ||
1002 | static void __exit stratix10_svc_exit(void) | |
1003 | { | |
1004 | return platform_driver_unregister(&stratix10_svc_driver); | |
1005 | } | |
1006 | ||
1007 | subsys_initcall(stratix10_svc_init); | |
1008 | module_exit(stratix10_svc_exit); | |
1009 | ||
1010 | MODULE_LICENSE("GPL v2"); | |
1011 | MODULE_DESCRIPTION("Intel Stratix10 Service Layer Driver"); | |
1012 | MODULE_AUTHOR("Richard Gong <richard.gong@intel.com>"); | |
1013 | MODULE_ALIAS("platform:stratix10-svc"); |