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 
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 	bool mem_ops_native;
86 };
87 
88 static struct ffa_drv_info *drv_info;
89 
90 /*
91  * The driver must be able to support all the versions from the earliest
92  * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
93  * The specification states that if firmware supports a FFA implementation
94  * that is incompatible with and at a greater version number than specified
95  * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
96  * it must return the NOT_SUPPORTED error code.
97  */
98 static u32 ffa_compatible_version_find(u32 version)
99 {
100 	u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
101 	u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
102 	u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);
103 
104 	if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
105 		return version;
106 
107 	pr_info("Firmware version higher than driver version, downgrading\n");
108 	return FFA_DRIVER_VERSION;
109 }
110 
111 static int ffa_version_check(u32 *version)
112 {
113 	ffa_value_t ver;
114 
115 	invoke_ffa_fn((ffa_value_t){
116 		      .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
117 		      }, &ver);
118 
119 	if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
120 		pr_info("FFA_VERSION returned not supported\n");
121 		return -EOPNOTSUPP;
122 	}
123 
124 	if (ver.a0 < FFA_MIN_VERSION) {
125 		pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
126 		       FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
127 		       FFA_MAJOR_VERSION(FFA_MIN_VERSION),
128 		       FFA_MINOR_VERSION(FFA_MIN_VERSION));
129 		return -EINVAL;
130 	}
131 
132 	pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
133 		FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
134 	pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
135 		FFA_MINOR_VERSION(ver.a0));
136 	*version = ffa_compatible_version_find(ver.a0);
137 
138 	return 0;
139 }
140 
141 static int ffa_rx_release(void)
142 {
143 	ffa_value_t ret;
144 
145 	invoke_ffa_fn((ffa_value_t){
146 		      .a0 = FFA_RX_RELEASE,
147 		      }, &ret);
148 
149 	if (ret.a0 == FFA_ERROR)
150 		return ffa_to_linux_errno((int)ret.a2);
151 
152 	/* check for ret.a0 == FFA_RX_RELEASE ? */
153 
154 	return 0;
155 }
156 
157 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
158 {
159 	ffa_value_t ret;
160 
161 	invoke_ffa_fn((ffa_value_t){
162 		      .a0 = FFA_FN_NATIVE(RXTX_MAP),
163 		      .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
164 		      }, &ret);
165 
166 	if (ret.a0 == FFA_ERROR)
167 		return ffa_to_linux_errno((int)ret.a2);
168 
169 	return 0;
170 }
171 
172 static int ffa_rxtx_unmap(u16 vm_id)
173 {
174 	ffa_value_t ret;
175 
176 	invoke_ffa_fn((ffa_value_t){
177 		      .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
178 		      }, &ret);
179 
180 	if (ret.a0 == FFA_ERROR)
181 		return ffa_to_linux_errno((int)ret.a2);
182 
183 	return 0;
184 }
185 
186 #define PARTITION_INFO_GET_RETURN_COUNT_ONLY	BIT(0)
187 
188 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
189 static int
190 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
191 			 struct ffa_partition_info *buffer, int num_partitions)
192 {
193 	int idx, count, flags = 0, sz, buf_sz;
194 	ffa_value_t partition_info;
195 
196 	if (!buffer || !num_partitions) /* Just get the count for now */
197 		flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
198 
199 	mutex_lock(&drv_info->rx_lock);
200 	invoke_ffa_fn((ffa_value_t){
201 		      .a0 = FFA_PARTITION_INFO_GET,
202 		      .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
203 		      .a5 = flags,
204 		      }, &partition_info);
205 
206 	if (partition_info.a0 == FFA_ERROR) {
207 		mutex_unlock(&drv_info->rx_lock);
208 		return ffa_to_linux_errno((int)partition_info.a2);
209 	}
210 
211 	count = partition_info.a2;
212 
213 	if (drv_info->version > FFA_VERSION_1_0) {
214 		buf_sz = sz = partition_info.a3;
215 		if (sz > sizeof(*buffer))
216 			buf_sz = sizeof(*buffer);
217 	} else {
218 		/* FFA_VERSION_1_0 lacks size in the response */
219 		buf_sz = sz = 8;
220 	}
221 
222 	if (buffer && count <= num_partitions)
223 		for (idx = 0; idx < count; idx++)
224 			memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
225 			       buf_sz);
226 
227 	ffa_rx_release();
228 
229 	mutex_unlock(&drv_info->rx_lock);
230 
231 	return count;
232 }
233 
234 /* buffer is allocated and caller must free the same if returned count > 0 */
235 static int
236 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
237 {
238 	int count;
239 	u32 uuid0_4[4];
240 	struct ffa_partition_info *pbuf;
241 
242 	export_uuid((u8 *)uuid0_4, uuid);
243 	count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
244 					 uuid0_4[3], NULL, 0);
245 	if (count <= 0)
246 		return count;
247 
248 	pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
249 	if (!pbuf)
250 		return -ENOMEM;
251 
252 	count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
253 					 uuid0_4[3], pbuf, count);
254 	if (count <= 0)
255 		kfree(pbuf);
256 	else
257 		*buffer = pbuf;
258 
259 	return count;
260 }
261 
262 #define VM_ID_MASK	GENMASK(15, 0)
263 static int ffa_id_get(u16 *vm_id)
264 {
265 	ffa_value_t id;
266 
267 	invoke_ffa_fn((ffa_value_t){
268 		      .a0 = FFA_ID_GET,
269 		      }, &id);
270 
271 	if (id.a0 == FFA_ERROR)
272 		return ffa_to_linux_errno((int)id.a2);
273 
274 	*vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
275 
276 	return 0;
277 }
278 
279 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
280 				   struct ffa_send_direct_data *data)
281 {
282 	u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
283 	ffa_value_t ret;
284 
285 	if (mode_32bit) {
286 		req_id = FFA_MSG_SEND_DIRECT_REQ;
287 		resp_id = FFA_MSG_SEND_DIRECT_RESP;
288 	} else {
289 		req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
290 		resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
291 	}
292 
293 	invoke_ffa_fn((ffa_value_t){
294 		      .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
295 		      .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
296 		      .a6 = data->data3, .a7 = data->data4,
297 		      }, &ret);
298 
299 	while (ret.a0 == FFA_INTERRUPT)
300 		invoke_ffa_fn((ffa_value_t){
301 			      .a0 = FFA_RUN, .a1 = ret.a1,
302 			      }, &ret);
303 
304 	if (ret.a0 == FFA_ERROR)
305 		return ffa_to_linux_errno((int)ret.a2);
306 
307 	if (ret.a0 == resp_id) {
308 		data->data0 = ret.a3;
309 		data->data1 = ret.a4;
310 		data->data2 = ret.a5;
311 		data->data3 = ret.a6;
312 		data->data4 = ret.a7;
313 		return 0;
314 	}
315 
316 	return -EINVAL;
317 }
318 
319 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
320 			      u32 frag_len, u32 len, u64 *handle)
321 {
322 	ffa_value_t ret;
323 
324 	invoke_ffa_fn((ffa_value_t){
325 		      .a0 = func_id, .a1 = len, .a2 = frag_len,
326 		      .a3 = buf, .a4 = buf_sz,
327 		      }, &ret);
328 
329 	while (ret.a0 == FFA_MEM_OP_PAUSE)
330 		invoke_ffa_fn((ffa_value_t){
331 			      .a0 = FFA_MEM_OP_RESUME,
332 			      .a1 = ret.a1, .a2 = ret.a2,
333 			      }, &ret);
334 
335 	if (ret.a0 == FFA_ERROR)
336 		return ffa_to_linux_errno((int)ret.a2);
337 
338 	if (ret.a0 == FFA_SUCCESS) {
339 		if (handle)
340 			*handle = PACK_HANDLE(ret.a2, ret.a3);
341 	} else if (ret.a0 == FFA_MEM_FRAG_RX) {
342 		if (handle)
343 			*handle = PACK_HANDLE(ret.a1, ret.a2);
344 	} else {
345 		return -EOPNOTSUPP;
346 	}
347 
348 	return frag_len;
349 }
350 
351 static int ffa_mem_next_frag(u64 handle, u32 frag_len)
352 {
353 	ffa_value_t ret;
354 
355 	invoke_ffa_fn((ffa_value_t){
356 		      .a0 = FFA_MEM_FRAG_TX,
357 		      .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
358 		      .a3 = frag_len,
359 		      }, &ret);
360 
361 	while (ret.a0 == FFA_MEM_OP_PAUSE)
362 		invoke_ffa_fn((ffa_value_t){
363 			      .a0 = FFA_MEM_OP_RESUME,
364 			      .a1 = ret.a1, .a2 = ret.a2,
365 			      }, &ret);
366 
367 	if (ret.a0 == FFA_ERROR)
368 		return ffa_to_linux_errno((int)ret.a2);
369 
370 	if (ret.a0 == FFA_MEM_FRAG_RX)
371 		return ret.a3;
372 	else if (ret.a0 == FFA_SUCCESS)
373 		return 0;
374 
375 	return -EOPNOTSUPP;
376 }
377 
378 static int
379 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
380 		      u32 len, u64 *handle, bool first)
381 {
382 	if (!first)
383 		return ffa_mem_next_frag(*handle, frag_len);
384 
385 	return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
386 }
387 
388 static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
389 {
390 	u32 num_pages = 0;
391 
392 	do {
393 		num_pages += sg->length / FFA_PAGE_SIZE;
394 	} while ((sg = sg_next(sg)));
395 
396 	return num_pages;
397 }
398 
399 static int
400 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
401 		       struct ffa_mem_ops_args *args)
402 {
403 	int rc = 0;
404 	bool first = true;
405 	phys_addr_t addr = 0;
406 	struct ffa_composite_mem_region *composite;
407 	struct ffa_mem_region_addr_range *constituents;
408 	struct ffa_mem_region_attributes *ep_mem_access;
409 	struct ffa_mem_region *mem_region = buffer;
410 	u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
411 
412 	mem_region->tag = args->tag;
413 	mem_region->flags = args->flags;
414 	mem_region->sender_id = drv_info->vm_id;
415 	mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK |
416 				 FFA_MEM_INNER_SHAREABLE;
417 	ep_mem_access = &mem_region->ep_mem_access[0];
418 
419 	for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
420 		ep_mem_access->receiver = args->attrs[idx].receiver;
421 		ep_mem_access->attrs = args->attrs[idx].attrs;
422 		ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
423 	}
424 	mem_region->ep_count = args->nattrs;
425 
426 	composite = buffer + COMPOSITE_OFFSET(args->nattrs);
427 	composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
428 	composite->addr_range_cnt = num_entries;
429 
430 	length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
431 	frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
432 	if (frag_len > max_fragsize)
433 		return -ENXIO;
434 
435 	if (!args->use_txbuf) {
436 		addr = virt_to_phys(buffer);
437 		buf_sz = max_fragsize / FFA_PAGE_SIZE;
438 	}
439 
440 	constituents = buffer + frag_len;
441 	idx = 0;
442 	do {
443 		if (frag_len == max_fragsize) {
444 			rc = ffa_transmit_fragment(func_id, addr, buf_sz,
445 						   frag_len, length,
446 						   &args->g_handle, first);
447 			if (rc < 0)
448 				return -ENXIO;
449 
450 			first = false;
451 			idx = 0;
452 			frag_len = 0;
453 			constituents = buffer;
454 		}
455 
456 		if ((void *)constituents - buffer > max_fragsize) {
457 			pr_err("Memory Region Fragment > Tx Buffer size\n");
458 			return -EFAULT;
459 		}
460 
461 		constituents->address = sg_phys(args->sg);
462 		constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
463 		constituents++;
464 		frag_len += sizeof(struct ffa_mem_region_addr_range);
465 	} while ((args->sg = sg_next(args->sg)));
466 
467 	return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
468 				     length, &args->g_handle, first);
469 }
470 
471 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
472 {
473 	int ret;
474 	void *buffer;
475 
476 	if (!args->use_txbuf) {
477 		buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
478 		if (!buffer)
479 			return -ENOMEM;
480 	} else {
481 		buffer = drv_info->tx_buffer;
482 		mutex_lock(&drv_info->tx_lock);
483 	}
484 
485 	ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);
486 
487 	if (args->use_txbuf)
488 		mutex_unlock(&drv_info->tx_lock);
489 	else
490 		free_pages_exact(buffer, RXTX_BUFFER_SIZE);
491 
492 	return ret < 0 ? ret : 0;
493 }
494 
495 static int ffa_memory_reclaim(u64 g_handle, u32 flags)
496 {
497 	ffa_value_t ret;
498 
499 	invoke_ffa_fn((ffa_value_t){
500 		      .a0 = FFA_MEM_RECLAIM,
501 		      .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
502 		      .a3 = flags,
503 		      }, &ret);
504 
505 	if (ret.a0 == FFA_ERROR)
506 		return ffa_to_linux_errno((int)ret.a2);
507 
508 	return 0;
509 }
510 
511 static int ffa_features(u32 func_feat_id, u32 input_props,
512 			u32 *if_props_1, u32 *if_props_2)
513 {
514 	ffa_value_t id;
515 
516 	if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
517 		pr_err("%s: Invalid Parameters: %x, %x", __func__,
518 		       func_feat_id, input_props);
519 		return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
520 	}
521 
522 	invoke_ffa_fn((ffa_value_t){
523 		.a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
524 		}, &id);
525 
526 	if (id.a0 == FFA_ERROR)
527 		return ffa_to_linux_errno((int)id.a2);
528 
529 	if (if_props_1)
530 		*if_props_1 = id.a2;
531 	if (if_props_2)
532 		*if_props_2 = id.a3;
533 
534 	return 0;
535 }
536 
537 static void ffa_set_up_mem_ops_native_flag(void)
538 {
539 	if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
540 	    !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
541 		drv_info->mem_ops_native = true;
542 }
543 
544 static u32 ffa_api_version_get(void)
545 {
546 	return drv_info->version;
547 }
548 
549 static int ffa_partition_info_get(const char *uuid_str,
550 				  struct ffa_partition_info *buffer)
551 {
552 	int count;
553 	uuid_t uuid;
554 	struct ffa_partition_info *pbuf;
555 
556 	if (uuid_parse(uuid_str, &uuid)) {
557 		pr_err("invalid uuid (%s)\n", uuid_str);
558 		return -ENODEV;
559 	}
560 
561 	count = ffa_partition_probe(&uuid, &pbuf);
562 	if (count <= 0)
563 		return -ENOENT;
564 
565 	memcpy(buffer, pbuf, sizeof(*pbuf) * count);
566 	kfree(pbuf);
567 	return 0;
568 }
569 
570 static void _ffa_mode_32bit_set(struct ffa_device *dev)
571 {
572 	dev->mode_32bit = true;
573 }
574 
575 static void ffa_mode_32bit_set(struct ffa_device *dev)
576 {
577 	if (drv_info->version > FFA_VERSION_1_0)
578 		return;
579 
580 	_ffa_mode_32bit_set(dev);
581 }
582 
583 static int ffa_sync_send_receive(struct ffa_device *dev,
584 				 struct ffa_send_direct_data *data)
585 {
586 	return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
587 				       dev->mode_32bit, data);
588 }
589 
590 static int ffa_memory_share(struct ffa_mem_ops_args *args)
591 {
592 	if (drv_info->mem_ops_native)
593 		return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
594 
595 	return ffa_memory_ops(FFA_MEM_SHARE, args);
596 }
597 
598 static int ffa_memory_lend(struct ffa_mem_ops_args *args)
599 {
600 	/* Note that upon a successful MEM_LEND request the caller
601 	 * must ensure that the memory region specified is not accessed
602 	 * until a successful MEM_RECALIM call has been made.
603 	 * On systems with a hypervisor present this will been enforced,
604 	 * however on systems without a hypervisor the responsibility
605 	 * falls to the calling kernel driver to prevent access.
606 	 */
607 	if (drv_info->mem_ops_native)
608 		return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
609 
610 	return ffa_memory_ops(FFA_MEM_LEND, args);
611 }
612 
613 static const struct ffa_info_ops ffa_drv_info_ops = {
614 	.api_version_get = ffa_api_version_get,
615 	.partition_info_get = ffa_partition_info_get,
616 };
617 
618 static const struct ffa_msg_ops ffa_drv_msg_ops = {
619 	.mode_32bit_set = ffa_mode_32bit_set,
620 	.sync_send_receive = ffa_sync_send_receive,
621 };
622 
623 static const struct ffa_mem_ops ffa_drv_mem_ops = {
624 	.memory_reclaim = ffa_memory_reclaim,
625 	.memory_share = ffa_memory_share,
626 	.memory_lend = ffa_memory_lend,
627 };
628 
629 static const struct ffa_ops ffa_drv_ops = {
630 	.info_ops = &ffa_drv_info_ops,
631 	.msg_ops = &ffa_drv_msg_ops,
632 	.mem_ops = &ffa_drv_mem_ops,
633 };
634 
635 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
636 {
637 	int count, idx;
638 	struct ffa_partition_info *pbuf, *tpbuf;
639 
640 	/*
641 	 * FF-A v1.1 provides UUID for each partition as part of the discovery
642 	 * API, the discovered UUID must be populated in the device's UUID and
643 	 * there is no need to copy the same from the driver table.
644 	 */
645 	if (drv_info->version > FFA_VERSION_1_0)
646 		return;
647 
648 	count = ffa_partition_probe(uuid, &pbuf);
649 	if (count <= 0)
650 		return;
651 
652 	for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
653 		if (tpbuf->id == ffa_dev->vm_id)
654 			uuid_copy(&ffa_dev->uuid, uuid);
655 	kfree(pbuf);
656 }
657 
658 static void ffa_setup_partitions(void)
659 {
660 	int count, idx;
661 	uuid_t uuid;
662 	struct ffa_device *ffa_dev;
663 	struct ffa_partition_info *pbuf, *tpbuf;
664 
665 	count = ffa_partition_probe(&uuid_null, &pbuf);
666 	if (count <= 0) {
667 		pr_info("%s: No partitions found, error %d\n", __func__, count);
668 		return;
669 	}
670 
671 	for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
672 		import_uuid(&uuid, (u8 *)tpbuf->uuid);
673 
674 		/* Note that if the UUID will be uuid_null, that will require
675 		 * ffa_device_match() to find the UUID of this partition id
676 		 * with help of ffa_device_match_uuid(). FF-A v1.1 and above
677 		 * provides UUID here for each partition as part of the
678 		 * discovery API and the same is passed.
679 		 */
680 		ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
681 		if (!ffa_dev) {
682 			pr_err("%s: failed to register partition ID 0x%x\n",
683 			       __func__, tpbuf->id);
684 			continue;
685 		}
686 
687 		if (drv_info->version > FFA_VERSION_1_0 &&
688 		    !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
689 			_ffa_mode_32bit_set(ffa_dev);
690 	}
691 	kfree(pbuf);
692 }
693 
694 static int __init ffa_init(void)
695 {
696 	int ret;
697 
698 	ret = ffa_transport_init(&invoke_ffa_fn);
699 	if (ret)
700 		return ret;
701 
702 	ret = arm_ffa_bus_init();
703 	if (ret)
704 		return ret;
705 
706 	drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
707 	if (!drv_info) {
708 		ret = -ENOMEM;
709 		goto ffa_bus_exit;
710 	}
711 
712 	ret = ffa_version_check(&drv_info->version);
713 	if (ret)
714 		goto free_drv_info;
715 
716 	if (ffa_id_get(&drv_info->vm_id)) {
717 		pr_err("failed to obtain VM id for self\n");
718 		ret = -ENODEV;
719 		goto free_drv_info;
720 	}
721 
722 	drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
723 	if (!drv_info->rx_buffer) {
724 		ret = -ENOMEM;
725 		goto free_pages;
726 	}
727 
728 	drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
729 	if (!drv_info->tx_buffer) {
730 		ret = -ENOMEM;
731 		goto free_pages;
732 	}
733 
734 	ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
735 			   virt_to_phys(drv_info->rx_buffer),
736 			   RXTX_BUFFER_SIZE / FFA_PAGE_SIZE);
737 	if (ret) {
738 		pr_err("failed to register FFA RxTx buffers\n");
739 		goto free_pages;
740 	}
741 
742 	mutex_init(&drv_info->rx_lock);
743 	mutex_init(&drv_info->tx_lock);
744 
745 	ffa_setup_partitions();
746 
747 	ffa_set_up_mem_ops_native_flag();
748 
749 	return 0;
750 free_pages:
751 	if (drv_info->tx_buffer)
752 		free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
753 	free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
754 free_drv_info:
755 	kfree(drv_info);
756 ffa_bus_exit:
757 	arm_ffa_bus_exit();
758 	return ret;
759 }
760 subsys_initcall(ffa_init);
761 
762 static void __exit ffa_exit(void)
763 {
764 	ffa_rxtx_unmap(drv_info->vm_id);
765 	free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
766 	free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
767 	kfree(drv_info);
768 	arm_ffa_bus_exit();
769 }
770 module_exit(ffa_exit);
771 
772 MODULE_ALIAS("arm-ffa");
773 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
774 MODULE_DESCRIPTION("Arm FF-A interface driver");
775 MODULE_LICENSE("GPL v2");
776