1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Arm Firmware Framework for ARMv8-A(FFA) interface driver
4 *
5 * The Arm FFA specification[1] describes a software architecture to
6 * leverages the virtualization extension to isolate software images
7 * provided by an ecosystem of vendors from each other and describes
8 * interfaces that standardize communication between the various software
9 * images including communication between images in the Secure world and
10 * Normal world. Any Hypervisor could use the FFA interfaces to enable
11 * communication between VMs it manages.
12 *
13 * The Hypervisor a.k.a Partition managers in FFA terminology can assign
14 * system resources(Memory regions, Devices, CPU cycles) to the partitions
15 * and manage isolation amongst them.
16 *
17 * [1] https://developer.arm.com/docs/den0077/latest
18 *
19 * Copyright (C) 2021 ARM Ltd.
20 */
21
22 #define DRIVER_NAME "ARM FF-A"
23 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
24
25 #include <linux/arm_ffa.h>
26 #include <linux/bitfield.h>
27 #include <linux/device.h>
28 #include <linux/io.h>
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/mm.h>
32 #include <linux/scatterlist.h>
33 #include <linux/slab.h>
34 #include <linux/uuid.h>
35
36 #include "common.h"
37
38 #define FFA_DRIVER_VERSION FFA_VERSION_1_0
39 #define FFA_MIN_VERSION FFA_VERSION_1_0
40
41 #define SENDER_ID_MASK GENMASK(31, 16)
42 #define RECEIVER_ID_MASK GENMASK(15, 0)
43 #define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
44 #define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
45 #define PACK_TARGET_INFO(s, r) \
46 (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
47
48 /*
49 * Keeping RX TX buffer size as 4K for now
50 * 64K may be preferred to keep it min a page in 64K PAGE_SIZE config
51 */
52 #define RXTX_BUFFER_SIZE SZ_4K
53
54 static ffa_fn *invoke_ffa_fn;
55
56 static const int ffa_linux_errmap[] = {
57 /* better than switch case as long as return value is continuous */
58 0, /* FFA_RET_SUCCESS */
59 -EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */
60 -EINVAL, /* FFA_RET_INVALID_PARAMETERS */
61 -ENOMEM, /* FFA_RET_NO_MEMORY */
62 -EBUSY, /* FFA_RET_BUSY */
63 -EINTR, /* FFA_RET_INTERRUPTED */
64 -EACCES, /* FFA_RET_DENIED */
65 -EAGAIN, /* FFA_RET_RETRY */
66 -ECANCELED, /* FFA_RET_ABORTED */
67 };
68
ffa_to_linux_errno(int errno)69 static inline int ffa_to_linux_errno(int errno)
70 {
71 int err_idx = -errno;
72
73 if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
74 return ffa_linux_errmap[err_idx];
75 return -EINVAL;
76 }
77
78 struct ffa_drv_info {
79 u32 version;
80 u16 vm_id;
81 struct mutex rx_lock; /* lock to protect Rx buffer */
82 struct mutex tx_lock; /* lock to protect Tx buffer */
83 void *rx_buffer;
84 void *tx_buffer;
85 };
86
87 static struct ffa_drv_info *drv_info;
88
89 /*
90 * The driver must be able to support all the versions from the earliest
91 * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
92 * The specification states that if firmware supports a FFA implementation
93 * that is incompatible with and at a greater version number than specified
94 * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
95 * it must return the NOT_SUPPORTED error code.
96 */
ffa_compatible_version_find(u32 version)97 static u32 ffa_compatible_version_find(u32 version)
98 {
99 u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
100 u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
101 u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);
102
103 if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
104 return version;
105
106 pr_info("Firmware version higher than driver version, downgrading\n");
107 return FFA_DRIVER_VERSION;
108 }
109
ffa_version_check(u32 * version)110 static int ffa_version_check(u32 *version)
111 {
112 ffa_value_t ver;
113
114 invoke_ffa_fn((ffa_value_t){
115 .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
116 }, &ver);
117
118 if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
119 pr_info("FFA_VERSION returned not supported\n");
120 return -EOPNOTSUPP;
121 }
122
123 if (ver.a0 < FFA_MIN_VERSION) {
124 pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
125 FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
126 FFA_MAJOR_VERSION(FFA_MIN_VERSION),
127 FFA_MINOR_VERSION(FFA_MIN_VERSION));
128 return -EINVAL;
129 }
130
131 pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
132 FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
133 pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
134 FFA_MINOR_VERSION(ver.a0));
135 *version = ffa_compatible_version_find(ver.a0);
136
137 return 0;
138 }
139
ffa_rx_release(void)140 static int ffa_rx_release(void)
141 {
142 ffa_value_t ret;
143
144 invoke_ffa_fn((ffa_value_t){
145 .a0 = FFA_RX_RELEASE,
146 }, &ret);
147
148 if (ret.a0 == FFA_ERROR)
149 return ffa_to_linux_errno((int)ret.a2);
150
151 /* check for ret.a0 == FFA_RX_RELEASE ? */
152
153 return 0;
154 }
155
ffa_rxtx_map(phys_addr_t tx_buf,phys_addr_t rx_buf,u32 pg_cnt)156 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
157 {
158 ffa_value_t ret;
159
160 invoke_ffa_fn((ffa_value_t){
161 .a0 = FFA_FN_NATIVE(RXTX_MAP),
162 .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
163 }, &ret);
164
165 if (ret.a0 == FFA_ERROR)
166 return ffa_to_linux_errno((int)ret.a2);
167
168 return 0;
169 }
170
ffa_rxtx_unmap(u16 vm_id)171 static int ffa_rxtx_unmap(u16 vm_id)
172 {
173 ffa_value_t ret;
174
175 invoke_ffa_fn((ffa_value_t){
176 .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
177 }, &ret);
178
179 if (ret.a0 == FFA_ERROR)
180 return ffa_to_linux_errno((int)ret.a2);
181
182 return 0;
183 }
184
185 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
186 static int
__ffa_partition_info_get(u32 uuid0,u32 uuid1,u32 uuid2,u32 uuid3,struct ffa_partition_info * buffer,int num_partitions)187 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
188 struct ffa_partition_info *buffer, int num_partitions)
189 {
190 int count;
191 ffa_value_t partition_info;
192
193 mutex_lock(&drv_info->rx_lock);
194 invoke_ffa_fn((ffa_value_t){
195 .a0 = FFA_PARTITION_INFO_GET,
196 .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
197 }, &partition_info);
198
199 if (partition_info.a0 == FFA_ERROR) {
200 mutex_unlock(&drv_info->rx_lock);
201 return ffa_to_linux_errno((int)partition_info.a2);
202 }
203
204 count = partition_info.a2;
205
206 if (buffer && count <= num_partitions)
207 memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count);
208
209 ffa_rx_release();
210
211 mutex_unlock(&drv_info->rx_lock);
212
213 return count;
214 }
215
216 /* buffer is allocated and caller must free the same if returned count > 0 */
217 static int
ffa_partition_probe(const uuid_t * uuid,struct ffa_partition_info ** buffer)218 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
219 {
220 int count;
221 u32 uuid0_4[4];
222 struct ffa_partition_info *pbuf;
223
224 export_uuid((u8 *)uuid0_4, uuid);
225 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
226 uuid0_4[3], NULL, 0);
227 if (count <= 0)
228 return count;
229
230 pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
231 if (!pbuf)
232 return -ENOMEM;
233
234 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
235 uuid0_4[3], pbuf, count);
236 if (count <= 0)
237 kfree(pbuf);
238 else
239 *buffer = pbuf;
240
241 return count;
242 }
243
244 #define VM_ID_MASK GENMASK(15, 0)
ffa_id_get(u16 * vm_id)245 static int ffa_id_get(u16 *vm_id)
246 {
247 ffa_value_t id;
248
249 invoke_ffa_fn((ffa_value_t){
250 .a0 = FFA_ID_GET,
251 }, &id);
252
253 if (id.a0 == FFA_ERROR)
254 return ffa_to_linux_errno((int)id.a2);
255
256 *vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
257
258 return 0;
259 }
260
ffa_msg_send_direct_req(u16 src_id,u16 dst_id,bool mode_32bit,struct ffa_send_direct_data * data)261 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
262 struct ffa_send_direct_data *data)
263 {
264 u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
265 ffa_value_t ret;
266
267 if (mode_32bit) {
268 req_id = FFA_MSG_SEND_DIRECT_REQ;
269 resp_id = FFA_MSG_SEND_DIRECT_RESP;
270 } else {
271 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
272 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
273 }
274
275 invoke_ffa_fn((ffa_value_t){
276 .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
277 .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
278 .a6 = data->data3, .a7 = data->data4,
279 }, &ret);
280
281 while (ret.a0 == FFA_INTERRUPT)
282 invoke_ffa_fn((ffa_value_t){
283 .a0 = FFA_RUN, .a1 = ret.a1,
284 }, &ret);
285
286 if (ret.a0 == FFA_ERROR)
287 return ffa_to_linux_errno((int)ret.a2);
288
289 if (ret.a0 == resp_id) {
290 data->data0 = ret.a3;
291 data->data1 = ret.a4;
292 data->data2 = ret.a5;
293 data->data3 = ret.a6;
294 data->data4 = ret.a7;
295 return 0;
296 }
297
298 return -EINVAL;
299 }
300
ffa_mem_first_frag(u32 func_id,phys_addr_t buf,u32 buf_sz,u32 frag_len,u32 len,u64 * handle)301 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
302 u32 frag_len, u32 len, u64 *handle)
303 {
304 ffa_value_t ret;
305
306 invoke_ffa_fn((ffa_value_t){
307 .a0 = func_id, .a1 = len, .a2 = frag_len,
308 .a3 = buf, .a4 = buf_sz,
309 }, &ret);
310
311 while (ret.a0 == FFA_MEM_OP_PAUSE)
312 invoke_ffa_fn((ffa_value_t){
313 .a0 = FFA_MEM_OP_RESUME,
314 .a1 = ret.a1, .a2 = ret.a2,
315 }, &ret);
316
317 if (ret.a0 == FFA_ERROR)
318 return ffa_to_linux_errno((int)ret.a2);
319
320 if (ret.a0 != FFA_SUCCESS)
321 return -EOPNOTSUPP;
322
323 if (handle)
324 *handle = PACK_HANDLE(ret.a2, ret.a3);
325
326 return frag_len;
327 }
328
ffa_mem_next_frag(u64 handle,u32 frag_len)329 static int ffa_mem_next_frag(u64 handle, u32 frag_len)
330 {
331 ffa_value_t ret;
332
333 invoke_ffa_fn((ffa_value_t){
334 .a0 = FFA_MEM_FRAG_TX,
335 .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
336 .a3 = frag_len,
337 }, &ret);
338
339 while (ret.a0 == FFA_MEM_OP_PAUSE)
340 invoke_ffa_fn((ffa_value_t){
341 .a0 = FFA_MEM_OP_RESUME,
342 .a1 = ret.a1, .a2 = ret.a2,
343 }, &ret);
344
345 if (ret.a0 == FFA_ERROR)
346 return ffa_to_linux_errno((int)ret.a2);
347
348 if (ret.a0 != FFA_MEM_FRAG_RX)
349 return -EOPNOTSUPP;
350
351 return ret.a3;
352 }
353
354 static int
ffa_transmit_fragment(u32 func_id,phys_addr_t buf,u32 buf_sz,u32 frag_len,u32 len,u64 * handle,bool first)355 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
356 u32 len, u64 *handle, bool first)
357 {
358 if (!first)
359 return ffa_mem_next_frag(*handle, frag_len);
360
361 return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
362 }
363
ffa_get_num_pages_sg(struct scatterlist * sg)364 static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
365 {
366 u32 num_pages = 0;
367
368 do {
369 num_pages += sg->length / FFA_PAGE_SIZE;
370 } while ((sg = sg_next(sg)));
371
372 return num_pages;
373 }
374
375 static int
ffa_setup_and_transmit(u32 func_id,void * buffer,u32 max_fragsize,struct ffa_mem_ops_args * args)376 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
377 struct ffa_mem_ops_args *args)
378 {
379 int rc = 0;
380 bool first = true;
381 phys_addr_t addr = 0;
382 struct ffa_composite_mem_region *composite;
383 struct ffa_mem_region_addr_range *constituents;
384 struct ffa_mem_region_attributes *ep_mem_access;
385 struct ffa_mem_region *mem_region = buffer;
386 u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
387
388 mem_region->tag = args->tag;
389 mem_region->flags = args->flags;
390 mem_region->sender_id = drv_info->vm_id;
391 mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK |
392 FFA_MEM_INNER_SHAREABLE;
393 ep_mem_access = &mem_region->ep_mem_access[0];
394
395 for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
396 ep_mem_access->receiver = args->attrs[idx].receiver;
397 ep_mem_access->attrs = args->attrs[idx].attrs;
398 ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
399 ep_mem_access->flag = 0;
400 ep_mem_access->reserved = 0;
401 }
402 mem_region->handle = 0;
403 mem_region->reserved_0 = 0;
404 mem_region->reserved_1 = 0;
405 mem_region->ep_count = args->nattrs;
406
407 composite = buffer + COMPOSITE_OFFSET(args->nattrs);
408 composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
409 composite->addr_range_cnt = num_entries;
410 composite->reserved = 0;
411
412 length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
413 frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
414 if (frag_len > max_fragsize)
415 return -ENXIO;
416
417 if (!args->use_txbuf) {
418 addr = virt_to_phys(buffer);
419 buf_sz = max_fragsize / FFA_PAGE_SIZE;
420 }
421
422 constituents = buffer + frag_len;
423 idx = 0;
424 do {
425 if (frag_len == max_fragsize) {
426 rc = ffa_transmit_fragment(func_id, addr, buf_sz,
427 frag_len, length,
428 &args->g_handle, first);
429 if (rc < 0)
430 return -ENXIO;
431
432 first = false;
433 idx = 0;
434 frag_len = 0;
435 constituents = buffer;
436 }
437
438 if ((void *)constituents - buffer > max_fragsize) {
439 pr_err("Memory Region Fragment > Tx Buffer size\n");
440 return -EFAULT;
441 }
442
443 constituents->address = sg_phys(args->sg);
444 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
445 constituents->reserved = 0;
446 constituents++;
447 frag_len += sizeof(struct ffa_mem_region_addr_range);
448 } while ((args->sg = sg_next(args->sg)));
449
450 return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
451 length, &args->g_handle, first);
452 }
453
ffa_memory_ops(u32 func_id,struct ffa_mem_ops_args * args)454 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
455 {
456 int ret;
457 void *buffer;
458
459 if (!args->use_txbuf) {
460 buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
461 if (!buffer)
462 return -ENOMEM;
463 } else {
464 buffer = drv_info->tx_buffer;
465 mutex_lock(&drv_info->tx_lock);
466 }
467
468 ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);
469
470 if (args->use_txbuf)
471 mutex_unlock(&drv_info->tx_lock);
472 else
473 free_pages_exact(buffer, RXTX_BUFFER_SIZE);
474
475 return ret < 0 ? ret : 0;
476 }
477
ffa_memory_reclaim(u64 g_handle,u32 flags)478 static int ffa_memory_reclaim(u64 g_handle, u32 flags)
479 {
480 ffa_value_t ret;
481
482 invoke_ffa_fn((ffa_value_t){
483 .a0 = FFA_MEM_RECLAIM,
484 .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
485 .a3 = flags,
486 }, &ret);
487
488 if (ret.a0 == FFA_ERROR)
489 return ffa_to_linux_errno((int)ret.a2);
490
491 return 0;
492 }
493
ffa_api_version_get(void)494 static u32 ffa_api_version_get(void)
495 {
496 return drv_info->version;
497 }
498
ffa_partition_info_get(const char * uuid_str,struct ffa_partition_info * buffer)499 static int ffa_partition_info_get(const char *uuid_str,
500 struct ffa_partition_info *buffer)
501 {
502 int count;
503 uuid_t uuid;
504 struct ffa_partition_info *pbuf;
505
506 if (uuid_parse(uuid_str, &uuid)) {
507 pr_err("invalid uuid (%s)\n", uuid_str);
508 return -ENODEV;
509 }
510
511 count = ffa_partition_probe(&uuid, &pbuf);
512 if (count <= 0)
513 return -ENOENT;
514
515 memcpy(buffer, pbuf, sizeof(*pbuf) * count);
516 kfree(pbuf);
517 return 0;
518 }
519
ffa_mode_32bit_set(struct ffa_device * dev)520 static void ffa_mode_32bit_set(struct ffa_device *dev)
521 {
522 dev->mode_32bit = true;
523 }
524
ffa_sync_send_receive(struct ffa_device * dev,struct ffa_send_direct_data * data)525 static int ffa_sync_send_receive(struct ffa_device *dev,
526 struct ffa_send_direct_data *data)
527 {
528 return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
529 dev->mode_32bit, data);
530 }
531
532 static int
ffa_memory_share(struct ffa_device * dev,struct ffa_mem_ops_args * args)533 ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args)
534 {
535 if (dev->mode_32bit)
536 return ffa_memory_ops(FFA_MEM_SHARE, args);
537
538 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
539 }
540
541 static int
ffa_memory_lend(struct ffa_device * dev,struct ffa_mem_ops_args * args)542 ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args)
543 {
544 /* Note that upon a successful MEM_LEND request the caller
545 * must ensure that the memory region specified is not accessed
546 * until a successful MEM_RECALIM call has been made.
547 * On systems with a hypervisor present this will been enforced,
548 * however on systems without a hypervisor the responsibility
549 * falls to the calling kernel driver to prevent access.
550 */
551 if (dev->mode_32bit)
552 return ffa_memory_ops(FFA_MEM_LEND, args);
553
554 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
555 }
556
557 static const struct ffa_dev_ops ffa_ops = {
558 .api_version_get = ffa_api_version_get,
559 .partition_info_get = ffa_partition_info_get,
560 .mode_32bit_set = ffa_mode_32bit_set,
561 .sync_send_receive = ffa_sync_send_receive,
562 .memory_reclaim = ffa_memory_reclaim,
563 .memory_share = ffa_memory_share,
564 .memory_lend = ffa_memory_lend,
565 };
566
ffa_dev_ops_get(struct ffa_device * dev)567 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev)
568 {
569 if (ffa_device_is_valid(dev))
570 return &ffa_ops;
571
572 return NULL;
573 }
574 EXPORT_SYMBOL_GPL(ffa_dev_ops_get);
575
ffa_device_match_uuid(struct ffa_device * ffa_dev,const uuid_t * uuid)576 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
577 {
578 int count, idx;
579 struct ffa_partition_info *pbuf, *tpbuf;
580
581 count = ffa_partition_probe(uuid, &pbuf);
582 if (count <= 0)
583 return;
584
585 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
586 if (tpbuf->id == ffa_dev->vm_id)
587 uuid_copy(&ffa_dev->uuid, uuid);
588 kfree(pbuf);
589 }
590
ffa_setup_partitions(void)591 static void ffa_setup_partitions(void)
592 {
593 int count, idx;
594 struct ffa_device *ffa_dev;
595 struct ffa_partition_info *pbuf, *tpbuf;
596
597 count = ffa_partition_probe(&uuid_null, &pbuf);
598 if (count <= 0) {
599 pr_info("%s: No partitions found, error %d\n", __func__, count);
600 return;
601 }
602
603 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
604 /* Note that the &uuid_null parameter will require
605 * ffa_device_match() to find the UUID of this partition id
606 * with help of ffa_device_match_uuid(). Once the FF-A spec
607 * is updated to provide correct UUID here for each partition
608 * as part of the discovery API, we need to pass the
609 * discovered UUID here instead.
610 */
611 ffa_dev = ffa_device_register(&uuid_null, tpbuf->id);
612 if (!ffa_dev) {
613 pr_err("%s: failed to register partition ID 0x%x\n",
614 __func__, tpbuf->id);
615 continue;
616 }
617 }
618 kfree(pbuf);
619 }
620
ffa_init(void)621 static int __init ffa_init(void)
622 {
623 int ret;
624
625 ret = ffa_transport_init(&invoke_ffa_fn);
626 if (ret)
627 return ret;
628
629 ret = arm_ffa_bus_init();
630 if (ret)
631 return ret;
632
633 drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
634 if (!drv_info) {
635 ret = -ENOMEM;
636 goto ffa_bus_exit;
637 }
638
639 ret = ffa_version_check(&drv_info->version);
640 if (ret)
641 goto free_drv_info;
642
643 if (ffa_id_get(&drv_info->vm_id)) {
644 pr_err("failed to obtain VM id for self\n");
645 ret = -ENODEV;
646 goto free_drv_info;
647 }
648
649 drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
650 if (!drv_info->rx_buffer) {
651 ret = -ENOMEM;
652 goto free_pages;
653 }
654
655 drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
656 if (!drv_info->tx_buffer) {
657 ret = -ENOMEM;
658 goto free_pages;
659 }
660
661 ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
662 virt_to_phys(drv_info->rx_buffer),
663 RXTX_BUFFER_SIZE / FFA_PAGE_SIZE);
664 if (ret) {
665 pr_err("failed to register FFA RxTx buffers\n");
666 goto free_pages;
667 }
668
669 mutex_init(&drv_info->rx_lock);
670 mutex_init(&drv_info->tx_lock);
671
672 ffa_setup_partitions();
673
674 return 0;
675 free_pages:
676 if (drv_info->tx_buffer)
677 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
678 free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
679 free_drv_info:
680 kfree(drv_info);
681 ffa_bus_exit:
682 arm_ffa_bus_exit();
683 return ret;
684 }
685 subsys_initcall(ffa_init);
686
ffa_exit(void)687 static void __exit ffa_exit(void)
688 {
689 ffa_rxtx_unmap(drv_info->vm_id);
690 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
691 free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
692 kfree(drv_info);
693 arm_ffa_bus_exit();
694 }
695 module_exit(ffa_exit);
696
697 MODULE_ALIAS("arm-ffa");
698 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
699 MODULE_DESCRIPTION("Arm FF-A interface driver");
700 MODULE_LICENSE("GPL v2");
701