xref: /linux/drivers/firmware/arm_ffa/driver.c (revision aa56d752673aaec3cab7d73c668c4b29925d3ba0)
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/acpi.h>
26 #include <linux/arm_ffa.h>
27 #include <linux/bitfield.h>
28 #include <linux/cpuhotplug.h>
29 #include <linux/delay.h>
30 #include <linux/device.h>
31 #include <linux/hashtable.h>
32 #include <linux/interrupt.h>
33 #include <linux/io.h>
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/mm.h>
37 #include <linux/mutex.h>
38 #include <linux/of_irq.h>
39 #include <linux/scatterlist.h>
40 #include <linux/slab.h>
41 #include <linux/smp.h>
42 #include <linux/uuid.h>
43 #include <linux/xarray.h>
44 
45 #include "common.h"
46 
47 #define FFA_DRIVER_VERSION	FFA_VERSION_1_1
48 #define FFA_MIN_VERSION		FFA_VERSION_1_0
49 
50 #define SENDER_ID_MASK		GENMASK(31, 16)
51 #define RECEIVER_ID_MASK	GENMASK(15, 0)
52 #define SENDER_ID(x)		((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
53 #define RECEIVER_ID(x)		((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
54 #define PACK_TARGET_INFO(s, r)		\
55 	(FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
56 
57 #define RXTX_MAP_MIN_BUFSZ_MASK	GENMASK(1, 0)
58 #define RXTX_MAP_MIN_BUFSZ(x)	((x) & RXTX_MAP_MIN_BUFSZ_MASK)
59 
60 #define FFA_MAX_NOTIFICATIONS		64
61 
62 static ffa_fn *invoke_ffa_fn;
63 
64 static const int ffa_linux_errmap[] = {
65 	/* better than switch case as long as return value is continuous */
66 	0,		/* FFA_RET_SUCCESS */
67 	-EOPNOTSUPP,	/* FFA_RET_NOT_SUPPORTED */
68 	-EINVAL,	/* FFA_RET_INVALID_PARAMETERS */
69 	-ENOMEM,	/* FFA_RET_NO_MEMORY */
70 	-EBUSY,		/* FFA_RET_BUSY */
71 	-EINTR,		/* FFA_RET_INTERRUPTED */
72 	-EACCES,	/* FFA_RET_DENIED */
73 	-EAGAIN,	/* FFA_RET_RETRY */
74 	-ECANCELED,	/* FFA_RET_ABORTED */
75 	-ENODATA,	/* FFA_RET_NO_DATA */
76 	-EAGAIN,	/* FFA_RET_NOT_READY */
77 };
78 
79 static inline int ffa_to_linux_errno(int errno)
80 {
81 	int err_idx = -errno;
82 
83 	if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
84 		return ffa_linux_errmap[err_idx];
85 	return -EINVAL;
86 }
87 
88 struct ffa_pcpu_irq {
89 	struct ffa_drv_info *info;
90 };
91 
92 struct ffa_drv_info {
93 	u32 version;
94 	u16 vm_id;
95 	struct mutex rx_lock; /* lock to protect Rx buffer */
96 	struct mutex tx_lock; /* lock to protect Tx buffer */
97 	void *rx_buffer;
98 	void *tx_buffer;
99 	size_t rxtx_bufsz;
100 	bool mem_ops_native;
101 	bool msg_direct_req2_supp;
102 	bool bitmap_created;
103 	bool notif_enabled;
104 	unsigned int sched_recv_irq;
105 	unsigned int notif_pend_irq;
106 	unsigned int cpuhp_state;
107 	struct ffa_pcpu_irq __percpu *irq_pcpu;
108 	struct workqueue_struct *notif_pcpu_wq;
109 	struct work_struct notif_pcpu_work;
110 	struct work_struct sched_recv_irq_work;
111 	struct xarray partition_info;
112 	DECLARE_HASHTABLE(notifier_hash, ilog2(FFA_MAX_NOTIFICATIONS));
113 	struct mutex notify_lock; /* lock to protect notifier hashtable  */
114 };
115 
116 static struct ffa_drv_info *drv_info;
117 static void ffa_partitions_cleanup(void);
118 
119 /*
120  * The driver must be able to support all the versions from the earliest
121  * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
122  * The specification states that if firmware supports a FFA implementation
123  * that is incompatible with and at a greater version number than specified
124  * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
125  * it must return the NOT_SUPPORTED error code.
126  */
127 static u32 ffa_compatible_version_find(u32 version)
128 {
129 	u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
130 	u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
131 	u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);
132 
133 	if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
134 		return version;
135 
136 	pr_info("Firmware version higher than driver version, downgrading\n");
137 	return FFA_DRIVER_VERSION;
138 }
139 
140 static int ffa_version_check(u32 *version)
141 {
142 	ffa_value_t ver;
143 
144 	invoke_ffa_fn((ffa_value_t){
145 		      .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
146 		      }, &ver);
147 
148 	if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
149 		pr_info("FFA_VERSION returned not supported\n");
150 		return -EOPNOTSUPP;
151 	}
152 
153 	if (ver.a0 < FFA_MIN_VERSION) {
154 		pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
155 		       FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
156 		       FFA_MAJOR_VERSION(FFA_MIN_VERSION),
157 		       FFA_MINOR_VERSION(FFA_MIN_VERSION));
158 		return -EINVAL;
159 	}
160 
161 	pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
162 		FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
163 	pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
164 		FFA_MINOR_VERSION(ver.a0));
165 	*version = ffa_compatible_version_find(ver.a0);
166 
167 	return 0;
168 }
169 
170 static int ffa_rx_release(void)
171 {
172 	ffa_value_t ret;
173 
174 	invoke_ffa_fn((ffa_value_t){
175 		      .a0 = FFA_RX_RELEASE,
176 		      }, &ret);
177 
178 	if (ret.a0 == FFA_ERROR)
179 		return ffa_to_linux_errno((int)ret.a2);
180 
181 	/* check for ret.a0 == FFA_RX_RELEASE ? */
182 
183 	return 0;
184 }
185 
186 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
187 {
188 	ffa_value_t ret;
189 
190 	invoke_ffa_fn((ffa_value_t){
191 		      .a0 = FFA_FN_NATIVE(RXTX_MAP),
192 		      .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
193 		      }, &ret);
194 
195 	if (ret.a0 == FFA_ERROR)
196 		return ffa_to_linux_errno((int)ret.a2);
197 
198 	return 0;
199 }
200 
201 static int ffa_rxtx_unmap(u16 vm_id)
202 {
203 	ffa_value_t ret;
204 
205 	invoke_ffa_fn((ffa_value_t){
206 		      .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
207 		      }, &ret);
208 
209 	if (ret.a0 == FFA_ERROR)
210 		return ffa_to_linux_errno((int)ret.a2);
211 
212 	return 0;
213 }
214 
215 static int ffa_features(u32 func_feat_id, u32 input_props,
216 			u32 *if_props_1, u32 *if_props_2)
217 {
218 	ffa_value_t id;
219 
220 	if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
221 		pr_err("%s: Invalid Parameters: %x, %x", __func__,
222 		       func_feat_id, input_props);
223 		return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
224 	}
225 
226 	invoke_ffa_fn((ffa_value_t){
227 		.a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
228 		}, &id);
229 
230 	if (id.a0 == FFA_ERROR)
231 		return ffa_to_linux_errno((int)id.a2);
232 
233 	if (if_props_1)
234 		*if_props_1 = id.a2;
235 	if (if_props_2)
236 		*if_props_2 = id.a3;
237 
238 	return 0;
239 }
240 
241 #define PARTITION_INFO_GET_RETURN_COUNT_ONLY	BIT(0)
242 
243 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
244 static int
245 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
246 			 struct ffa_partition_info *buffer, int num_partitions)
247 {
248 	int idx, count, flags = 0, sz, buf_sz;
249 	ffa_value_t partition_info;
250 
251 	if (drv_info->version > FFA_VERSION_1_0 &&
252 	    (!buffer || !num_partitions)) /* Just get the count for now */
253 		flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
254 
255 	mutex_lock(&drv_info->rx_lock);
256 	invoke_ffa_fn((ffa_value_t){
257 		      .a0 = FFA_PARTITION_INFO_GET,
258 		      .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
259 		      .a5 = flags,
260 		      }, &partition_info);
261 
262 	if (partition_info.a0 == FFA_ERROR) {
263 		mutex_unlock(&drv_info->rx_lock);
264 		return ffa_to_linux_errno((int)partition_info.a2);
265 	}
266 
267 	count = partition_info.a2;
268 
269 	if (drv_info->version > FFA_VERSION_1_0) {
270 		buf_sz = sz = partition_info.a3;
271 		if (sz > sizeof(*buffer))
272 			buf_sz = sizeof(*buffer);
273 	} else {
274 		/* FFA_VERSION_1_0 lacks size in the response */
275 		buf_sz = sz = 8;
276 	}
277 
278 	if (buffer && count <= num_partitions)
279 		for (idx = 0; idx < count; idx++)
280 			memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
281 			       buf_sz);
282 
283 	ffa_rx_release();
284 
285 	mutex_unlock(&drv_info->rx_lock);
286 
287 	return count;
288 }
289 
290 #define LAST_INDEX_MASK		GENMASK(15, 0)
291 #define CURRENT_INDEX_MASK	GENMASK(31, 16)
292 #define UUID_INFO_TAG_MASK	GENMASK(47, 32)
293 #define PARTITION_INFO_SZ_MASK	GENMASK(63, 48)
294 #define PARTITION_COUNT(x)	((u16)(FIELD_GET(LAST_INDEX_MASK, (x))) + 1)
295 #define CURRENT_INDEX(x)	((u16)(FIELD_GET(CURRENT_INDEX_MASK, (x))))
296 #define UUID_INFO_TAG(x)	((u16)(FIELD_GET(UUID_INFO_TAG_MASK, (x))))
297 #define PARTITION_INFO_SZ(x)	((u16)(FIELD_GET(PARTITION_INFO_SZ_MASK, (x))))
298 static int
299 __ffa_partition_info_get_regs(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
300 			      struct ffa_partition_info *buffer, int num_parts)
301 {
302 	u16 buf_sz, start_idx, cur_idx, count = 0, prev_idx = 0, tag = 0;
303 	ffa_value_t partition_info;
304 
305 	do {
306 		start_idx = prev_idx ? prev_idx + 1 : 0;
307 
308 		invoke_ffa_fn((ffa_value_t){
309 			      .a0 = FFA_PARTITION_INFO_GET_REGS,
310 			      .a1 = (u64)uuid1 << 32 | uuid0,
311 			      .a2 = (u64)uuid3 << 32 | uuid2,
312 			      .a3 = start_idx | tag << 16,
313 			      }, &partition_info);
314 
315 		if (partition_info.a0 == FFA_ERROR)
316 			return ffa_to_linux_errno((int)partition_info.a2);
317 
318 		if (!count)
319 			count = PARTITION_COUNT(partition_info.a2);
320 		if (!buffer || !num_parts) /* count only */
321 			return count;
322 
323 		cur_idx = CURRENT_INDEX(partition_info.a2);
324 		tag = UUID_INFO_TAG(partition_info.a2);
325 		buf_sz = PARTITION_INFO_SZ(partition_info.a2);
326 		if (buf_sz > sizeof(*buffer))
327 			buf_sz = sizeof(*buffer);
328 
329 		memcpy(buffer + prev_idx * buf_sz, &partition_info.a3,
330 		       (cur_idx - start_idx + 1) * buf_sz);
331 		prev_idx = cur_idx;
332 
333 	} while (cur_idx < (count - 1));
334 
335 	return count;
336 }
337 
338 /* buffer is allocated and caller must free the same if returned count > 0 */
339 static int
340 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
341 {
342 	int count;
343 	u32 uuid0_4[4];
344 	bool reg_mode = false;
345 	struct ffa_partition_info *pbuf;
346 
347 	if (!ffa_features(FFA_PARTITION_INFO_GET_REGS, 0, NULL, NULL))
348 		reg_mode = true;
349 
350 	export_uuid((u8 *)uuid0_4, uuid);
351 	if (reg_mode)
352 		count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1],
353 						      uuid0_4[2], uuid0_4[3],
354 						      NULL, 0);
355 	else
356 		count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1],
357 						 uuid0_4[2], uuid0_4[3],
358 						 NULL, 0);
359 	if (count <= 0)
360 		return count;
361 
362 	pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
363 	if (!pbuf)
364 		return -ENOMEM;
365 
366 	if (reg_mode)
367 		count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1],
368 						      uuid0_4[2], uuid0_4[3],
369 						      pbuf, count);
370 	else
371 		count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1],
372 						 uuid0_4[2], uuid0_4[3],
373 						 pbuf, count);
374 	if (count <= 0)
375 		kfree(pbuf);
376 	else
377 		*buffer = pbuf;
378 
379 	return count;
380 }
381 
382 #define VM_ID_MASK	GENMASK(15, 0)
383 static int ffa_id_get(u16 *vm_id)
384 {
385 	ffa_value_t id;
386 
387 	invoke_ffa_fn((ffa_value_t){
388 		      .a0 = FFA_ID_GET,
389 		      }, &id);
390 
391 	if (id.a0 == FFA_ERROR)
392 		return ffa_to_linux_errno((int)id.a2);
393 
394 	*vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
395 
396 	return 0;
397 }
398 
399 static inline void ffa_msg_send_wait_for_completion(ffa_value_t *ret)
400 {
401 	while (ret->a0 == FFA_INTERRUPT || ret->a0 == FFA_YIELD) {
402 		if (ret->a0 == FFA_YIELD)
403 			fsleep(1000);
404 
405 		invoke_ffa_fn((ffa_value_t){
406 			      .a0 = FFA_RUN, .a1 = ret->a1,
407 			      }, ret);
408 	}
409 }
410 
411 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
412 				   struct ffa_send_direct_data *data)
413 {
414 	u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
415 	ffa_value_t ret;
416 
417 	if (mode_32bit) {
418 		req_id = FFA_MSG_SEND_DIRECT_REQ;
419 		resp_id = FFA_MSG_SEND_DIRECT_RESP;
420 	} else {
421 		req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
422 		resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
423 	}
424 
425 	invoke_ffa_fn((ffa_value_t){
426 		      .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
427 		      .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
428 		      .a6 = data->data3, .a7 = data->data4,
429 		      }, &ret);
430 
431 	ffa_msg_send_wait_for_completion(&ret);
432 
433 	if (ret.a0 == FFA_ERROR)
434 		return ffa_to_linux_errno((int)ret.a2);
435 
436 	if (ret.a0 == resp_id) {
437 		data->data0 = ret.a3;
438 		data->data1 = ret.a4;
439 		data->data2 = ret.a5;
440 		data->data3 = ret.a6;
441 		data->data4 = ret.a7;
442 		return 0;
443 	}
444 
445 	return -EINVAL;
446 }
447 
448 static int ffa_msg_send2(u16 src_id, u16 dst_id, void *buf, size_t sz)
449 {
450 	u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
451 	struct ffa_indirect_msg_hdr *msg;
452 	ffa_value_t ret;
453 	int retval = 0;
454 
455 	if (sz > (drv_info->rxtx_bufsz - sizeof(*msg)))
456 		return -ERANGE;
457 
458 	mutex_lock(&drv_info->tx_lock);
459 
460 	msg = drv_info->tx_buffer;
461 	msg->flags = 0;
462 	msg->res0 = 0;
463 	msg->offset = sizeof(*msg);
464 	msg->send_recv_id = src_dst_ids;
465 	msg->size = sz;
466 	memcpy((u8 *)msg + msg->offset, buf, sz);
467 
468 	/* flags = 0, sender VMID = 0 works for both physical/virtual NS */
469 	invoke_ffa_fn((ffa_value_t){
470 		      .a0 = FFA_MSG_SEND2, .a1 = 0, .a2 = 0
471 		      }, &ret);
472 
473 	if (ret.a0 == FFA_ERROR)
474 		retval = ffa_to_linux_errno((int)ret.a2);
475 
476 	mutex_unlock(&drv_info->tx_lock);
477 	return retval;
478 }
479 
480 static int ffa_msg_send_direct_req2(u16 src_id, u16 dst_id, const uuid_t *uuid,
481 				    struct ffa_send_direct_data2 *data)
482 {
483 	u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
484 	union {
485 		uuid_t uuid;
486 		__le64 regs[2];
487 	} uuid_regs = { .uuid = *uuid };
488 	ffa_value_t ret, args = {
489 		.a0 = FFA_MSG_SEND_DIRECT_REQ2,
490 		.a1 = src_dst_ids,
491 		.a2 = le64_to_cpu(uuid_regs.regs[0]),
492 		.a3 = le64_to_cpu(uuid_regs.regs[1]),
493 	};
494 	memcpy((void *)&args + offsetof(ffa_value_t, a4), data, sizeof(*data));
495 
496 	invoke_ffa_fn(args, &ret);
497 
498 	ffa_msg_send_wait_for_completion(&ret);
499 
500 	if (ret.a0 == FFA_ERROR)
501 		return ffa_to_linux_errno((int)ret.a2);
502 
503 	if (ret.a0 == FFA_MSG_SEND_DIRECT_RESP2) {
504 		memcpy(data, (void *)&ret + offsetof(ffa_value_t, a4), sizeof(*data));
505 		return 0;
506 	}
507 
508 	return -EINVAL;
509 }
510 
511 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
512 			      u32 frag_len, u32 len, u64 *handle)
513 {
514 	ffa_value_t ret;
515 
516 	invoke_ffa_fn((ffa_value_t){
517 		      .a0 = func_id, .a1 = len, .a2 = frag_len,
518 		      .a3 = buf, .a4 = buf_sz,
519 		      }, &ret);
520 
521 	while (ret.a0 == FFA_MEM_OP_PAUSE)
522 		invoke_ffa_fn((ffa_value_t){
523 			      .a0 = FFA_MEM_OP_RESUME,
524 			      .a1 = ret.a1, .a2 = ret.a2,
525 			      }, &ret);
526 
527 	if (ret.a0 == FFA_ERROR)
528 		return ffa_to_linux_errno((int)ret.a2);
529 
530 	if (ret.a0 == FFA_SUCCESS) {
531 		if (handle)
532 			*handle = PACK_HANDLE(ret.a2, ret.a3);
533 	} else if (ret.a0 == FFA_MEM_FRAG_RX) {
534 		if (handle)
535 			*handle = PACK_HANDLE(ret.a1, ret.a2);
536 	} else {
537 		return -EOPNOTSUPP;
538 	}
539 
540 	return frag_len;
541 }
542 
543 static int ffa_mem_next_frag(u64 handle, u32 frag_len)
544 {
545 	ffa_value_t ret;
546 
547 	invoke_ffa_fn((ffa_value_t){
548 		      .a0 = FFA_MEM_FRAG_TX,
549 		      .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
550 		      .a3 = frag_len,
551 		      }, &ret);
552 
553 	while (ret.a0 == FFA_MEM_OP_PAUSE)
554 		invoke_ffa_fn((ffa_value_t){
555 			      .a0 = FFA_MEM_OP_RESUME,
556 			      .a1 = ret.a1, .a2 = ret.a2,
557 			      }, &ret);
558 
559 	if (ret.a0 == FFA_ERROR)
560 		return ffa_to_linux_errno((int)ret.a2);
561 
562 	if (ret.a0 == FFA_MEM_FRAG_RX)
563 		return ret.a3;
564 	else if (ret.a0 == FFA_SUCCESS)
565 		return 0;
566 
567 	return -EOPNOTSUPP;
568 }
569 
570 static int
571 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
572 		      u32 len, u64 *handle, bool first)
573 {
574 	if (!first)
575 		return ffa_mem_next_frag(*handle, frag_len);
576 
577 	return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
578 }
579 
580 static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
581 {
582 	u32 num_pages = 0;
583 
584 	do {
585 		num_pages += sg->length / FFA_PAGE_SIZE;
586 	} while ((sg = sg_next(sg)));
587 
588 	return num_pages;
589 }
590 
591 static u16 ffa_memory_attributes_get(u32 func_id)
592 {
593 	/*
594 	 * For the memory lend or donate operation, if the receiver is a PE or
595 	 * a proxy endpoint, the owner/sender must not specify the attributes
596 	 */
597 	if (func_id == FFA_FN_NATIVE(MEM_LEND) ||
598 	    func_id == FFA_MEM_LEND)
599 		return 0;
600 
601 	return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE;
602 }
603 
604 static int
605 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
606 		       struct ffa_mem_ops_args *args)
607 {
608 	int rc = 0;
609 	bool first = true;
610 	u32 composite_offset;
611 	phys_addr_t addr = 0;
612 	struct ffa_mem_region *mem_region = buffer;
613 	struct ffa_composite_mem_region *composite;
614 	struct ffa_mem_region_addr_range *constituents;
615 	struct ffa_mem_region_attributes *ep_mem_access;
616 	u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
617 
618 	mem_region->tag = args->tag;
619 	mem_region->flags = args->flags;
620 	mem_region->sender_id = drv_info->vm_id;
621 	mem_region->attributes = ffa_memory_attributes_get(func_id);
622 	ep_mem_access = buffer +
623 			ffa_mem_desc_offset(buffer, 0, drv_info->version);
624 	composite_offset = ffa_mem_desc_offset(buffer, args->nattrs,
625 					       drv_info->version);
626 
627 	for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
628 		ep_mem_access->receiver = args->attrs[idx].receiver;
629 		ep_mem_access->attrs = args->attrs[idx].attrs;
630 		ep_mem_access->composite_off = composite_offset;
631 		ep_mem_access->flag = 0;
632 		ep_mem_access->reserved = 0;
633 	}
634 	mem_region->handle = 0;
635 	mem_region->ep_count = args->nattrs;
636 	if (drv_info->version <= FFA_VERSION_1_0) {
637 		mem_region->ep_mem_size = 0;
638 	} else {
639 		mem_region->ep_mem_size = sizeof(*ep_mem_access);
640 		mem_region->ep_mem_offset = sizeof(*mem_region);
641 		memset(mem_region->reserved, 0, 12);
642 	}
643 
644 	composite = buffer + composite_offset;
645 	composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
646 	composite->addr_range_cnt = num_entries;
647 	composite->reserved = 0;
648 
649 	length = composite_offset + CONSTITUENTS_OFFSET(num_entries);
650 	frag_len = composite_offset + CONSTITUENTS_OFFSET(0);
651 	if (frag_len > max_fragsize)
652 		return -ENXIO;
653 
654 	if (!args->use_txbuf) {
655 		addr = virt_to_phys(buffer);
656 		buf_sz = max_fragsize / FFA_PAGE_SIZE;
657 	}
658 
659 	constituents = buffer + frag_len;
660 	idx = 0;
661 	do {
662 		if (frag_len == max_fragsize) {
663 			rc = ffa_transmit_fragment(func_id, addr, buf_sz,
664 						   frag_len, length,
665 						   &args->g_handle, first);
666 			if (rc < 0)
667 				return -ENXIO;
668 
669 			first = false;
670 			idx = 0;
671 			frag_len = 0;
672 			constituents = buffer;
673 		}
674 
675 		if ((void *)constituents - buffer > max_fragsize) {
676 			pr_err("Memory Region Fragment > Tx Buffer size\n");
677 			return -EFAULT;
678 		}
679 
680 		constituents->address = sg_phys(args->sg);
681 		constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
682 		constituents->reserved = 0;
683 		constituents++;
684 		frag_len += sizeof(struct ffa_mem_region_addr_range);
685 	} while ((args->sg = sg_next(args->sg)));
686 
687 	return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
688 				     length, &args->g_handle, first);
689 }
690 
691 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
692 {
693 	int ret;
694 	void *buffer;
695 	size_t rxtx_bufsz = drv_info->rxtx_bufsz;
696 
697 	if (!args->use_txbuf) {
698 		buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
699 		if (!buffer)
700 			return -ENOMEM;
701 	} else {
702 		buffer = drv_info->tx_buffer;
703 		mutex_lock(&drv_info->tx_lock);
704 	}
705 
706 	ret = ffa_setup_and_transmit(func_id, buffer, rxtx_bufsz, args);
707 
708 	if (args->use_txbuf)
709 		mutex_unlock(&drv_info->tx_lock);
710 	else
711 		free_pages_exact(buffer, rxtx_bufsz);
712 
713 	return ret < 0 ? ret : 0;
714 }
715 
716 static int ffa_memory_reclaim(u64 g_handle, u32 flags)
717 {
718 	ffa_value_t ret;
719 
720 	invoke_ffa_fn((ffa_value_t){
721 		      .a0 = FFA_MEM_RECLAIM,
722 		      .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
723 		      .a3 = flags,
724 		      }, &ret);
725 
726 	if (ret.a0 == FFA_ERROR)
727 		return ffa_to_linux_errno((int)ret.a2);
728 
729 	return 0;
730 }
731 
732 static int ffa_notification_bitmap_create(void)
733 {
734 	ffa_value_t ret;
735 	u16 vcpu_count = nr_cpu_ids;
736 
737 	invoke_ffa_fn((ffa_value_t){
738 		      .a0 = FFA_NOTIFICATION_BITMAP_CREATE,
739 		      .a1 = drv_info->vm_id, .a2 = vcpu_count,
740 		      }, &ret);
741 
742 	if (ret.a0 == FFA_ERROR)
743 		return ffa_to_linux_errno((int)ret.a2);
744 
745 	return 0;
746 }
747 
748 static int ffa_notification_bitmap_destroy(void)
749 {
750 	ffa_value_t ret;
751 
752 	invoke_ffa_fn((ffa_value_t){
753 		      .a0 = FFA_NOTIFICATION_BITMAP_DESTROY,
754 		      .a1 = drv_info->vm_id,
755 		      }, &ret);
756 
757 	if (ret.a0 == FFA_ERROR)
758 		return ffa_to_linux_errno((int)ret.a2);
759 
760 	return 0;
761 }
762 
763 #define NOTIFICATION_LOW_MASK		GENMASK(31, 0)
764 #define NOTIFICATION_HIGH_MASK		GENMASK(63, 32)
765 #define NOTIFICATION_BITMAP_HIGH(x)	\
766 		((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x))))
767 #define NOTIFICATION_BITMAP_LOW(x)	\
768 		((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x))))
769 #define PACK_NOTIFICATION_BITMAP(low, high)	\
770 	(FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \
771 	 FIELD_PREP(NOTIFICATION_HIGH_MASK, (high)))
772 
773 #define RECEIVER_VCPU_MASK		GENMASK(31, 16)
774 #define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \
775 	(FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \
776 	 FIELD_PREP(RECEIVER_ID_MASK, (r)))
777 
778 #define NOTIFICATION_INFO_GET_MORE_PEND_MASK	BIT(0)
779 #define NOTIFICATION_INFO_GET_ID_COUNT		GENMASK(11, 7)
780 #define ID_LIST_MASK_64				GENMASK(51, 12)
781 #define ID_LIST_MASK_32				GENMASK(31, 12)
782 #define MAX_IDS_64				20
783 #define MAX_IDS_32				10
784 
785 #define PER_VCPU_NOTIFICATION_FLAG		BIT(0)
786 #define SECURE_PARTITION_BITMAP			BIT(0)
787 #define NON_SECURE_VM_BITMAP			BIT(1)
788 #define SPM_FRAMEWORK_BITMAP			BIT(2)
789 #define NS_HYP_FRAMEWORK_BITMAP			BIT(3)
790 
791 static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
792 					u32 flags, bool is_bind)
793 {
794 	ffa_value_t ret;
795 	u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id);
796 
797 	func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND;
798 
799 	invoke_ffa_fn((ffa_value_t){
800 		  .a0 = func, .a1 = src_dst_ids, .a2 = flags,
801 		  .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
802 		  .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
803 		  }, &ret);
804 
805 	if (ret.a0 == FFA_ERROR)
806 		return ffa_to_linux_errno((int)ret.a2);
807 	else if (ret.a0 != FFA_SUCCESS)
808 		return -EINVAL;
809 
810 	return 0;
811 }
812 
813 static
814 int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap)
815 {
816 	ffa_value_t ret;
817 	u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id);
818 
819 	invoke_ffa_fn((ffa_value_t) {
820 		  .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags,
821 		  .a3 = NOTIFICATION_BITMAP_LOW(bitmap),
822 		  .a4 = NOTIFICATION_BITMAP_HIGH(bitmap),
823 		  }, &ret);
824 
825 	if (ret.a0 == FFA_ERROR)
826 		return ffa_to_linux_errno((int)ret.a2);
827 	else if (ret.a0 != FFA_SUCCESS)
828 		return -EINVAL;
829 
830 	return 0;
831 }
832 
833 struct ffa_notify_bitmaps {
834 	u64 sp_map;
835 	u64 vm_map;
836 	u64 arch_map;
837 };
838 
839 static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
840 {
841 	ffa_value_t ret;
842 	u16 src_id = drv_info->vm_id;
843 	u16 cpu_id = smp_processor_id();
844 	u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id);
845 
846 	invoke_ffa_fn((ffa_value_t){
847 		  .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags,
848 		  }, &ret);
849 
850 	if (ret.a0 == FFA_ERROR)
851 		return ffa_to_linux_errno((int)ret.a2);
852 	else if (ret.a0 != FFA_SUCCESS)
853 		return -EINVAL; /* Something else went wrong. */
854 
855 	notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3);
856 	notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5);
857 	notify->arch_map = PACK_NOTIFICATION_BITMAP(ret.a6, ret.a7);
858 
859 	return 0;
860 }
861 
862 struct ffa_dev_part_info {
863 	ffa_sched_recv_cb callback;
864 	void *cb_data;
865 	rwlock_t rw_lock;
866 };
867 
868 static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
869 {
870 	struct ffa_dev_part_info *partition;
871 	ffa_sched_recv_cb callback;
872 	void *cb_data;
873 
874 	partition = xa_load(&drv_info->partition_info, part_id);
875 	if (!partition) {
876 		pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
877 		return;
878 	}
879 
880 	read_lock(&partition->rw_lock);
881 	callback = partition->callback;
882 	cb_data = partition->cb_data;
883 	read_unlock(&partition->rw_lock);
884 
885 	if (callback)
886 		callback(vcpu, is_per_vcpu, cb_data);
887 }
888 
889 static void ffa_notification_info_get(void)
890 {
891 	int idx, list, max_ids, lists_cnt, ids_processed, ids_count[MAX_IDS_64];
892 	bool is_64b_resp;
893 	ffa_value_t ret;
894 	u64 id_list;
895 
896 	do {
897 		invoke_ffa_fn((ffa_value_t){
898 			  .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET),
899 			  }, &ret);
900 
901 		if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) {
902 			if (ret.a2 != FFA_RET_NO_DATA)
903 				pr_err("Notification Info fetch failed: 0x%lx (0x%lx)",
904 				       ret.a0, ret.a2);
905 			return;
906 		}
907 
908 		is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS);
909 
910 		ids_processed = 0;
911 		lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2);
912 		if (is_64b_resp) {
913 			max_ids = MAX_IDS_64;
914 			id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2);
915 		} else {
916 			max_ids = MAX_IDS_32;
917 			id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2);
918 		}
919 
920 		for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2)
921 			ids_count[idx] = (id_list & 0x3) + 1;
922 
923 		/* Process IDs */
924 		for (list = 0; list < lists_cnt; list++) {
925 			u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3;
926 
927 			if (ids_processed >= max_ids - 1)
928 				break;
929 
930 			part_id = packed_id_list[ids_processed++];
931 
932 			if (ids_count[list] == 1) { /* Global Notification */
933 				__do_sched_recv_cb(part_id, 0, false);
934 				continue;
935 			}
936 
937 			/* Per vCPU Notification */
938 			for (idx = 0; idx < ids_count[list]; idx++) {
939 				if (ids_processed >= max_ids - 1)
940 					break;
941 
942 				vcpu_id = packed_id_list[ids_processed++];
943 
944 				__do_sched_recv_cb(part_id, vcpu_id, true);
945 			}
946 		}
947 	} while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK);
948 }
949 
950 static int ffa_run(struct ffa_device *dev, u16 vcpu)
951 {
952 	ffa_value_t ret;
953 	u32 target = dev->vm_id << 16 | vcpu;
954 
955 	invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret);
956 
957 	while (ret.a0 == FFA_INTERRUPT)
958 		invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, },
959 			      &ret);
960 
961 	if (ret.a0 == FFA_ERROR)
962 		return ffa_to_linux_errno((int)ret.a2);
963 
964 	return 0;
965 }
966 
967 static void ffa_drvinfo_flags_init(void)
968 {
969 	if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
970 	    !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
971 		drv_info->mem_ops_native = true;
972 
973 	if (!ffa_features(FFA_MSG_SEND_DIRECT_REQ2, 0, NULL, NULL) ||
974 	    !ffa_features(FFA_MSG_SEND_DIRECT_RESP2, 0, NULL, NULL))
975 		drv_info->msg_direct_req2_supp = true;
976 }
977 
978 static u32 ffa_api_version_get(void)
979 {
980 	return drv_info->version;
981 }
982 
983 static int ffa_partition_info_get(const char *uuid_str,
984 				  struct ffa_partition_info *buffer)
985 {
986 	int count;
987 	uuid_t uuid;
988 	struct ffa_partition_info *pbuf;
989 
990 	if (uuid_parse(uuid_str, &uuid)) {
991 		pr_err("invalid uuid (%s)\n", uuid_str);
992 		return -ENODEV;
993 	}
994 
995 	count = ffa_partition_probe(&uuid, &pbuf);
996 	if (count <= 0)
997 		return -ENOENT;
998 
999 	memcpy(buffer, pbuf, sizeof(*pbuf) * count);
1000 	kfree(pbuf);
1001 	return 0;
1002 }
1003 
1004 static void ffa_mode_32bit_set(struct ffa_device *dev)
1005 {
1006 	dev->mode_32bit = true;
1007 }
1008 
1009 static int ffa_sync_send_receive(struct ffa_device *dev,
1010 				 struct ffa_send_direct_data *data)
1011 {
1012 	return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
1013 				       dev->mode_32bit, data);
1014 }
1015 
1016 static int ffa_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz)
1017 {
1018 	return ffa_msg_send2(drv_info->vm_id, dev->vm_id, buf, sz);
1019 }
1020 
1021 static int ffa_sync_send_receive2(struct ffa_device *dev, const uuid_t *uuid,
1022 				  struct ffa_send_direct_data2 *data)
1023 {
1024 	if (!drv_info->msg_direct_req2_supp)
1025 		return -EOPNOTSUPP;
1026 
1027 	return ffa_msg_send_direct_req2(drv_info->vm_id, dev->vm_id,
1028 					uuid, data);
1029 }
1030 
1031 static int ffa_memory_share(struct ffa_mem_ops_args *args)
1032 {
1033 	if (drv_info->mem_ops_native)
1034 		return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
1035 
1036 	return ffa_memory_ops(FFA_MEM_SHARE, args);
1037 }
1038 
1039 static int ffa_memory_lend(struct ffa_mem_ops_args *args)
1040 {
1041 	/* Note that upon a successful MEM_LEND request the caller
1042 	 * must ensure that the memory region specified is not accessed
1043 	 * until a successful MEM_RECALIM call has been made.
1044 	 * On systems with a hypervisor present this will been enforced,
1045 	 * however on systems without a hypervisor the responsibility
1046 	 * falls to the calling kernel driver to prevent access.
1047 	 */
1048 	if (drv_info->mem_ops_native)
1049 		return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
1050 
1051 	return ffa_memory_ops(FFA_MEM_LEND, args);
1052 }
1053 
1054 #define FFA_SECURE_PARTITION_ID_FLAG	BIT(15)
1055 
1056 #define ffa_notifications_disabled()	(!drv_info->notif_enabled)
1057 
1058 enum notify_type {
1059 	NON_SECURE_VM,
1060 	SECURE_PARTITION,
1061 	FRAMEWORK,
1062 };
1063 
1064 struct notifier_cb_info {
1065 	struct hlist_node hnode;
1066 	ffa_notifier_cb cb;
1067 	void *cb_data;
1068 	enum notify_type type;
1069 };
1070 
1071 static int ffa_sched_recv_cb_update(u16 part_id, ffa_sched_recv_cb callback,
1072 				    void *cb_data, bool is_registration)
1073 {
1074 	struct ffa_dev_part_info *partition;
1075 	bool cb_valid;
1076 
1077 	if (ffa_notifications_disabled())
1078 		return -EOPNOTSUPP;
1079 
1080 	partition = xa_load(&drv_info->partition_info, part_id);
1081 	if (!partition) {
1082 		pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
1083 		return -EINVAL;
1084 	}
1085 
1086 	write_lock(&partition->rw_lock);
1087 
1088 	cb_valid = !!partition->callback;
1089 	if (!(is_registration ^ cb_valid)) {
1090 		write_unlock(&partition->rw_lock);
1091 		return -EINVAL;
1092 	}
1093 
1094 	partition->callback = callback;
1095 	partition->cb_data = cb_data;
1096 
1097 	write_unlock(&partition->rw_lock);
1098 	return 0;
1099 }
1100 
1101 static int ffa_sched_recv_cb_register(struct ffa_device *dev,
1102 				      ffa_sched_recv_cb cb, void *cb_data)
1103 {
1104 	return ffa_sched_recv_cb_update(dev->vm_id, cb, cb_data, true);
1105 }
1106 
1107 static int ffa_sched_recv_cb_unregister(struct ffa_device *dev)
1108 {
1109 	return ffa_sched_recv_cb_update(dev->vm_id, NULL, NULL, false);
1110 }
1111 
1112 static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags)
1113 {
1114 	return ffa_notification_bind_common(dst_id, bitmap, flags, true);
1115 }
1116 
1117 static int ffa_notification_unbind(u16 dst_id, u64 bitmap)
1118 {
1119 	return ffa_notification_bind_common(dst_id, bitmap, 0, false);
1120 }
1121 
1122 /* Should be called while the notify_lock is taken */
1123 static struct notifier_cb_info *
1124 notifier_hash_node_get(u16 notify_id, enum notify_type type)
1125 {
1126 	struct notifier_cb_info *node;
1127 
1128 	hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id)
1129 		if (type == node->type)
1130 			return node;
1131 
1132 	return NULL;
1133 }
1134 
1135 static int
1136 update_notifier_cb(int notify_id, enum notify_type type, ffa_notifier_cb cb,
1137 		   void *cb_data, bool is_registration)
1138 {
1139 	struct notifier_cb_info *cb_info = NULL;
1140 	bool cb_found;
1141 
1142 	cb_info = notifier_hash_node_get(notify_id, type);
1143 	cb_found = !!cb_info;
1144 
1145 	if (!(is_registration ^ cb_found))
1146 		return -EINVAL;
1147 
1148 	if (is_registration) {
1149 		cb_info = kzalloc(sizeof(*cb_info), GFP_KERNEL);
1150 		if (!cb_info)
1151 			return -ENOMEM;
1152 
1153 		cb_info->type = type;
1154 		cb_info->cb = cb;
1155 		cb_info->cb_data = cb_data;
1156 
1157 		hash_add(drv_info->notifier_hash, &cb_info->hnode, notify_id);
1158 	} else {
1159 		hash_del(&cb_info->hnode);
1160 	}
1161 
1162 	return 0;
1163 }
1164 
1165 static enum notify_type ffa_notify_type_get(u16 vm_id)
1166 {
1167 	if (vm_id & FFA_SECURE_PARTITION_ID_FLAG)
1168 		return SECURE_PARTITION;
1169 	else
1170 		return NON_SECURE_VM;
1171 }
1172 
1173 static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id)
1174 {
1175 	int rc;
1176 	enum notify_type type = ffa_notify_type_get(dev->vm_id);
1177 
1178 	if (ffa_notifications_disabled())
1179 		return -EOPNOTSUPP;
1180 
1181 	if (notify_id >= FFA_MAX_NOTIFICATIONS)
1182 		return -EINVAL;
1183 
1184 	mutex_lock(&drv_info->notify_lock);
1185 
1186 	rc = update_notifier_cb(notify_id, type, NULL, NULL, false);
1187 	if (rc) {
1188 		pr_err("Could not unregister notification callback\n");
1189 		mutex_unlock(&drv_info->notify_lock);
1190 		return rc;
1191 	}
1192 
1193 	rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id));
1194 
1195 	mutex_unlock(&drv_info->notify_lock);
1196 
1197 	return rc;
1198 }
1199 
1200 static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu,
1201 			      ffa_notifier_cb cb, void *cb_data, int notify_id)
1202 {
1203 	int rc;
1204 	u32 flags = 0;
1205 	enum notify_type type = ffa_notify_type_get(dev->vm_id);
1206 
1207 	if (ffa_notifications_disabled())
1208 		return -EOPNOTSUPP;
1209 
1210 	if (notify_id >= FFA_MAX_NOTIFICATIONS)
1211 		return -EINVAL;
1212 
1213 	mutex_lock(&drv_info->notify_lock);
1214 
1215 	if (is_per_vcpu)
1216 		flags = PER_VCPU_NOTIFICATION_FLAG;
1217 
1218 	rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags);
1219 	if (rc) {
1220 		mutex_unlock(&drv_info->notify_lock);
1221 		return rc;
1222 	}
1223 
1224 	rc = update_notifier_cb(notify_id, type, cb, cb_data, true);
1225 	if (rc) {
1226 		pr_err("Failed to register callback for %d - %d\n",
1227 		       notify_id, rc);
1228 		ffa_notification_unbind(dev->vm_id, BIT(notify_id));
1229 	}
1230 	mutex_unlock(&drv_info->notify_lock);
1231 
1232 	return rc;
1233 }
1234 
1235 static int ffa_notify_send(struct ffa_device *dev, int notify_id,
1236 			   bool is_per_vcpu, u16 vcpu)
1237 {
1238 	u32 flags = 0;
1239 
1240 	if (ffa_notifications_disabled())
1241 		return -EOPNOTSUPP;
1242 
1243 	if (is_per_vcpu)
1244 		flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16);
1245 
1246 	return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags,
1247 				    BIT(notify_id));
1248 }
1249 
1250 static void handle_notif_callbacks(u64 bitmap, enum notify_type type)
1251 {
1252 	int notify_id;
1253 	struct notifier_cb_info *cb_info = NULL;
1254 
1255 	for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap;
1256 	     notify_id++, bitmap >>= 1) {
1257 		if (!(bitmap & 1))
1258 			continue;
1259 
1260 		mutex_lock(&drv_info->notify_lock);
1261 		cb_info = notifier_hash_node_get(notify_id, type);
1262 		mutex_unlock(&drv_info->notify_lock);
1263 
1264 		if (cb_info && cb_info->cb)
1265 			cb_info->cb(notify_id, cb_info->cb_data);
1266 	}
1267 }
1268 
1269 static void notif_get_and_handle(void *unused)
1270 {
1271 	int rc;
1272 	struct ffa_notify_bitmaps bitmaps;
1273 
1274 	rc = ffa_notification_get(SECURE_PARTITION_BITMAP |
1275 				  SPM_FRAMEWORK_BITMAP, &bitmaps);
1276 	if (rc) {
1277 		pr_err("Failed to retrieve notifications with %d!\n", rc);
1278 		return;
1279 	}
1280 
1281 	handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM);
1282 	handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION);
1283 	handle_notif_callbacks(bitmaps.arch_map, FRAMEWORK);
1284 }
1285 
1286 static void
1287 ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data)
1288 {
1289 	struct ffa_drv_info *info = cb_data;
1290 
1291 	if (!is_per_vcpu)
1292 		notif_get_and_handle(info);
1293 	else
1294 		smp_call_function_single(vcpu, notif_get_and_handle, info, 0);
1295 }
1296 
1297 static void notif_pcpu_irq_work_fn(struct work_struct *work)
1298 {
1299 	struct ffa_drv_info *info = container_of(work, struct ffa_drv_info,
1300 						 notif_pcpu_work);
1301 
1302 	ffa_self_notif_handle(smp_processor_id(), true, info);
1303 }
1304 
1305 static const struct ffa_info_ops ffa_drv_info_ops = {
1306 	.api_version_get = ffa_api_version_get,
1307 	.partition_info_get = ffa_partition_info_get,
1308 };
1309 
1310 static const struct ffa_msg_ops ffa_drv_msg_ops = {
1311 	.mode_32bit_set = ffa_mode_32bit_set,
1312 	.sync_send_receive = ffa_sync_send_receive,
1313 	.indirect_send = ffa_indirect_msg_send,
1314 	.sync_send_receive2 = ffa_sync_send_receive2,
1315 };
1316 
1317 static const struct ffa_mem_ops ffa_drv_mem_ops = {
1318 	.memory_reclaim = ffa_memory_reclaim,
1319 	.memory_share = ffa_memory_share,
1320 	.memory_lend = ffa_memory_lend,
1321 };
1322 
1323 static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
1324 	.run = ffa_run,
1325 };
1326 
1327 static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
1328 	.sched_recv_cb_register = ffa_sched_recv_cb_register,
1329 	.sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
1330 	.notify_request = ffa_notify_request,
1331 	.notify_relinquish = ffa_notify_relinquish,
1332 	.notify_send = ffa_notify_send,
1333 };
1334 
1335 static const struct ffa_ops ffa_drv_ops = {
1336 	.info_ops = &ffa_drv_info_ops,
1337 	.msg_ops = &ffa_drv_msg_ops,
1338 	.mem_ops = &ffa_drv_mem_ops,
1339 	.cpu_ops = &ffa_drv_cpu_ops,
1340 	.notifier_ops = &ffa_drv_notifier_ops,
1341 };
1342 
1343 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
1344 {
1345 	int count, idx;
1346 	struct ffa_partition_info *pbuf, *tpbuf;
1347 
1348 	count = ffa_partition_probe(uuid, &pbuf);
1349 	if (count <= 0)
1350 		return;
1351 
1352 	for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
1353 		if (tpbuf->id == ffa_dev->vm_id)
1354 			uuid_copy(&ffa_dev->uuid, uuid);
1355 	kfree(pbuf);
1356 }
1357 
1358 static int
1359 ffa_bus_notifier(struct notifier_block *nb, unsigned long action, void *data)
1360 {
1361 	struct device *dev = data;
1362 	struct ffa_device *fdev = to_ffa_dev(dev);
1363 
1364 	if (action == BUS_NOTIFY_BIND_DRIVER) {
1365 		struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
1366 		const struct ffa_device_id *id_table = ffa_drv->id_table;
1367 
1368 		/*
1369 		 * FF-A v1.1 provides UUID for each partition as part of the
1370 		 * discovery API, the discovered UUID must be populated in the
1371 		 * device's UUID and there is no need to workaround by copying
1372 		 * the same from the driver table.
1373 		 */
1374 		if (uuid_is_null(&fdev->uuid))
1375 			ffa_device_match_uuid(fdev, &id_table->uuid);
1376 
1377 		return NOTIFY_OK;
1378 	}
1379 
1380 	return NOTIFY_DONE;
1381 }
1382 
1383 static struct notifier_block ffa_bus_nb = {
1384 	.notifier_call = ffa_bus_notifier,
1385 };
1386 
1387 static int ffa_setup_partitions(void)
1388 {
1389 	int count, idx, ret;
1390 	uuid_t uuid;
1391 	struct ffa_device *ffa_dev;
1392 	struct ffa_dev_part_info *info;
1393 	struct ffa_partition_info *pbuf, *tpbuf;
1394 
1395 	if (drv_info->version == FFA_VERSION_1_0) {
1396 		ret = bus_register_notifier(&ffa_bus_type, &ffa_bus_nb);
1397 		if (ret)
1398 			pr_err("Failed to register FF-A bus notifiers\n");
1399 	}
1400 
1401 	count = ffa_partition_probe(&uuid_null, &pbuf);
1402 	if (count <= 0) {
1403 		pr_info("%s: No partitions found, error %d\n", __func__, count);
1404 		return -EINVAL;
1405 	}
1406 
1407 	xa_init(&drv_info->partition_info);
1408 	for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
1409 		import_uuid(&uuid, (u8 *)tpbuf->uuid);
1410 
1411 		/* Note that if the UUID will be uuid_null, that will require
1412 		 * ffa_bus_notifier() to find the UUID of this partition id
1413 		 * with help of ffa_device_match_uuid(). FF-A v1.1 and above
1414 		 * provides UUID here for each partition as part of the
1415 		 * discovery API and the same is passed.
1416 		 */
1417 		ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
1418 		if (!ffa_dev) {
1419 			pr_err("%s: failed to register partition ID 0x%x\n",
1420 			       __func__, tpbuf->id);
1421 			continue;
1422 		}
1423 
1424 		ffa_dev->properties = tpbuf->properties;
1425 
1426 		if (drv_info->version > FFA_VERSION_1_0 &&
1427 		    !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
1428 			ffa_mode_32bit_set(ffa_dev);
1429 
1430 		info = kzalloc(sizeof(*info), GFP_KERNEL);
1431 		if (!info) {
1432 			ffa_device_unregister(ffa_dev);
1433 			continue;
1434 		}
1435 		rwlock_init(&info->rw_lock);
1436 		ret = xa_insert(&drv_info->partition_info, tpbuf->id,
1437 				info, GFP_KERNEL);
1438 		if (ret) {
1439 			pr_err("%s: failed to save partition ID 0x%x - ret:%d\n",
1440 			       __func__, tpbuf->id, ret);
1441 			ffa_device_unregister(ffa_dev);
1442 			kfree(info);
1443 		}
1444 	}
1445 
1446 	kfree(pbuf);
1447 
1448 	/* Allocate for the host */
1449 	info = kzalloc(sizeof(*info), GFP_KERNEL);
1450 	if (!info) {
1451 		/* Already registered devices are freed on bus_exit */
1452 		ffa_partitions_cleanup();
1453 		return -ENOMEM;
1454 	}
1455 
1456 	rwlock_init(&info->rw_lock);
1457 	ret = xa_insert(&drv_info->partition_info, drv_info->vm_id,
1458 			info, GFP_KERNEL);
1459 	if (ret) {
1460 		pr_err("%s: failed to save Host partition ID 0x%x - ret:%d. Abort.\n",
1461 		       __func__, drv_info->vm_id, ret);
1462 		kfree(info);
1463 		/* Already registered devices are freed on bus_exit */
1464 		ffa_partitions_cleanup();
1465 	}
1466 
1467 	return ret;
1468 }
1469 
1470 static void ffa_partitions_cleanup(void)
1471 {
1472 	struct ffa_dev_part_info *info;
1473 	unsigned long idx;
1474 
1475 	xa_for_each(&drv_info->partition_info, idx, info) {
1476 		xa_erase(&drv_info->partition_info, idx);
1477 		kfree(info);
1478 	}
1479 
1480 	xa_destroy(&drv_info->partition_info);
1481 }
1482 
1483 /* FFA FEATURE IDs */
1484 #define FFA_FEAT_NOTIFICATION_PENDING_INT	(1)
1485 #define FFA_FEAT_SCHEDULE_RECEIVER_INT		(2)
1486 #define FFA_FEAT_MANAGED_EXIT_INT		(3)
1487 
1488 static irqreturn_t ffa_sched_recv_irq_handler(int irq, void *irq_data)
1489 {
1490 	struct ffa_pcpu_irq *pcpu = irq_data;
1491 	struct ffa_drv_info *info = pcpu->info;
1492 
1493 	queue_work(info->notif_pcpu_wq, &info->sched_recv_irq_work);
1494 
1495 	return IRQ_HANDLED;
1496 }
1497 
1498 static irqreturn_t notif_pend_irq_handler(int irq, void *irq_data)
1499 {
1500 	struct ffa_pcpu_irq *pcpu = irq_data;
1501 	struct ffa_drv_info *info = pcpu->info;
1502 
1503 	queue_work_on(smp_processor_id(), info->notif_pcpu_wq,
1504 		      &info->notif_pcpu_work);
1505 
1506 	return IRQ_HANDLED;
1507 }
1508 
1509 static void ffa_sched_recv_irq_work_fn(struct work_struct *work)
1510 {
1511 	ffa_notification_info_get();
1512 }
1513 
1514 static int ffa_irq_map(u32 id)
1515 {
1516 	char *err_str;
1517 	int ret, irq, intid;
1518 
1519 	if (id == FFA_FEAT_NOTIFICATION_PENDING_INT)
1520 		err_str = "Notification Pending Interrupt";
1521 	else if (id == FFA_FEAT_SCHEDULE_RECEIVER_INT)
1522 		err_str = "Schedule Receiver Interrupt";
1523 	else
1524 		err_str = "Unknown ID";
1525 
1526 	/* The returned intid is assumed to be SGI donated to NS world */
1527 	ret = ffa_features(id, 0, &intid, NULL);
1528 	if (ret < 0) {
1529 		if (ret != -EOPNOTSUPP)
1530 			pr_err("Failed to retrieve FF-A %s %u\n", err_str, id);
1531 		return ret;
1532 	}
1533 
1534 	if (acpi_disabled) {
1535 		struct of_phandle_args oirq = {};
1536 		struct device_node *gic;
1537 
1538 		/* Only GICv3 supported currently with the device tree */
1539 		gic = of_find_compatible_node(NULL, NULL, "arm,gic-v3");
1540 		if (!gic)
1541 			return -ENXIO;
1542 
1543 		oirq.np = gic;
1544 		oirq.args_count = 1;
1545 		oirq.args[0] = intid;
1546 		irq = irq_create_of_mapping(&oirq);
1547 		of_node_put(gic);
1548 #ifdef CONFIG_ACPI
1549 	} else {
1550 		irq = acpi_register_gsi(NULL, intid, ACPI_EDGE_SENSITIVE,
1551 					ACPI_ACTIVE_HIGH);
1552 #endif
1553 	}
1554 
1555 	if (irq <= 0) {
1556 		pr_err("Failed to create IRQ mapping!\n");
1557 		return -ENODATA;
1558 	}
1559 
1560 	return irq;
1561 }
1562 
1563 static void ffa_irq_unmap(unsigned int irq)
1564 {
1565 	if (!irq)
1566 		return;
1567 	irq_dispose_mapping(irq);
1568 }
1569 
1570 static int ffa_cpuhp_pcpu_irq_enable(unsigned int cpu)
1571 {
1572 	if (drv_info->sched_recv_irq)
1573 		enable_percpu_irq(drv_info->sched_recv_irq, IRQ_TYPE_NONE);
1574 	if (drv_info->notif_pend_irq)
1575 		enable_percpu_irq(drv_info->notif_pend_irq, IRQ_TYPE_NONE);
1576 	return 0;
1577 }
1578 
1579 static int ffa_cpuhp_pcpu_irq_disable(unsigned int cpu)
1580 {
1581 	if (drv_info->sched_recv_irq)
1582 		disable_percpu_irq(drv_info->sched_recv_irq);
1583 	if (drv_info->notif_pend_irq)
1584 		disable_percpu_irq(drv_info->notif_pend_irq);
1585 	return 0;
1586 }
1587 
1588 static void ffa_uninit_pcpu_irq(void)
1589 {
1590 	if (drv_info->cpuhp_state) {
1591 		cpuhp_remove_state(drv_info->cpuhp_state);
1592 		drv_info->cpuhp_state = 0;
1593 	}
1594 
1595 	if (drv_info->notif_pcpu_wq) {
1596 		destroy_workqueue(drv_info->notif_pcpu_wq);
1597 		drv_info->notif_pcpu_wq = NULL;
1598 	}
1599 
1600 	if (drv_info->sched_recv_irq)
1601 		free_percpu_irq(drv_info->sched_recv_irq, drv_info->irq_pcpu);
1602 
1603 	if (drv_info->notif_pend_irq)
1604 		free_percpu_irq(drv_info->notif_pend_irq, drv_info->irq_pcpu);
1605 
1606 	if (drv_info->irq_pcpu) {
1607 		free_percpu(drv_info->irq_pcpu);
1608 		drv_info->irq_pcpu = NULL;
1609 	}
1610 }
1611 
1612 static int ffa_init_pcpu_irq(void)
1613 {
1614 	struct ffa_pcpu_irq __percpu *irq_pcpu;
1615 	int ret, cpu;
1616 
1617 	irq_pcpu = alloc_percpu(struct ffa_pcpu_irq);
1618 	if (!irq_pcpu)
1619 		return -ENOMEM;
1620 
1621 	for_each_present_cpu(cpu)
1622 		per_cpu_ptr(irq_pcpu, cpu)->info = drv_info;
1623 
1624 	drv_info->irq_pcpu = irq_pcpu;
1625 
1626 	if (drv_info->sched_recv_irq) {
1627 		ret = request_percpu_irq(drv_info->sched_recv_irq,
1628 					 ffa_sched_recv_irq_handler,
1629 					 "ARM-FFA-SRI", irq_pcpu);
1630 		if (ret) {
1631 			pr_err("Error registering percpu SRI nIRQ %d : %d\n",
1632 			       drv_info->sched_recv_irq, ret);
1633 			drv_info->sched_recv_irq = 0;
1634 			return ret;
1635 		}
1636 	}
1637 
1638 	if (drv_info->notif_pend_irq) {
1639 		ret = request_percpu_irq(drv_info->notif_pend_irq,
1640 					 notif_pend_irq_handler,
1641 					 "ARM-FFA-NPI", irq_pcpu);
1642 		if (ret) {
1643 			pr_err("Error registering percpu NPI nIRQ %d : %d\n",
1644 			       drv_info->notif_pend_irq, ret);
1645 			drv_info->notif_pend_irq = 0;
1646 			return ret;
1647 		}
1648 	}
1649 
1650 	INIT_WORK(&drv_info->sched_recv_irq_work, ffa_sched_recv_irq_work_fn);
1651 	INIT_WORK(&drv_info->notif_pcpu_work, notif_pcpu_irq_work_fn);
1652 	drv_info->notif_pcpu_wq = create_workqueue("ffa_pcpu_irq_notification");
1653 	if (!drv_info->notif_pcpu_wq)
1654 		return -EINVAL;
1655 
1656 	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ffa/pcpu-irq:starting",
1657 				ffa_cpuhp_pcpu_irq_enable,
1658 				ffa_cpuhp_pcpu_irq_disable);
1659 
1660 	if (ret < 0)
1661 		return ret;
1662 
1663 	drv_info->cpuhp_state = ret;
1664 	return 0;
1665 }
1666 
1667 static void ffa_notifications_cleanup(void)
1668 {
1669 	ffa_uninit_pcpu_irq();
1670 	ffa_irq_unmap(drv_info->sched_recv_irq);
1671 	drv_info->sched_recv_irq = 0;
1672 	ffa_irq_unmap(drv_info->notif_pend_irq);
1673 	drv_info->notif_pend_irq = 0;
1674 
1675 	if (drv_info->bitmap_created) {
1676 		ffa_notification_bitmap_destroy();
1677 		drv_info->bitmap_created = false;
1678 	}
1679 	drv_info->notif_enabled = false;
1680 }
1681 
1682 static void ffa_notifications_setup(void)
1683 {
1684 	int ret;
1685 
1686 	ret = ffa_features(FFA_NOTIFICATION_BITMAP_CREATE, 0, NULL, NULL);
1687 	if (!ret) {
1688 		ret = ffa_notification_bitmap_create();
1689 		if (ret) {
1690 			pr_err("Notification bitmap create error %d\n", ret);
1691 			return;
1692 		}
1693 
1694 		drv_info->bitmap_created = true;
1695 	}
1696 
1697 	ret = ffa_irq_map(FFA_FEAT_SCHEDULE_RECEIVER_INT);
1698 	if (ret > 0)
1699 		drv_info->sched_recv_irq = ret;
1700 
1701 	ret = ffa_irq_map(FFA_FEAT_NOTIFICATION_PENDING_INT);
1702 	if (ret > 0)
1703 		drv_info->notif_pend_irq = ret;
1704 
1705 	if (!drv_info->sched_recv_irq && !drv_info->notif_pend_irq)
1706 		goto cleanup;
1707 
1708 	ret = ffa_init_pcpu_irq();
1709 	if (ret)
1710 		goto cleanup;
1711 
1712 	hash_init(drv_info->notifier_hash);
1713 	mutex_init(&drv_info->notify_lock);
1714 
1715 	drv_info->notif_enabled = true;
1716 	return;
1717 cleanup:
1718 	pr_info("Notification setup failed %d, not enabled\n", ret);
1719 	ffa_notifications_cleanup();
1720 }
1721 
1722 static int __init ffa_init(void)
1723 {
1724 	int ret;
1725 	u32 buf_sz;
1726 	size_t rxtx_bufsz = SZ_4K;
1727 
1728 	ret = ffa_transport_init(&invoke_ffa_fn);
1729 	if (ret)
1730 		return ret;
1731 
1732 	drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
1733 	if (!drv_info)
1734 		return -ENOMEM;
1735 
1736 	ret = ffa_version_check(&drv_info->version);
1737 	if (ret)
1738 		goto free_drv_info;
1739 
1740 	if (ffa_id_get(&drv_info->vm_id)) {
1741 		pr_err("failed to obtain VM id for self\n");
1742 		ret = -ENODEV;
1743 		goto free_drv_info;
1744 	}
1745 
1746 	ret = ffa_features(FFA_FN_NATIVE(RXTX_MAP), 0, &buf_sz, NULL);
1747 	if (!ret) {
1748 		if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 1)
1749 			rxtx_bufsz = SZ_64K;
1750 		else if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 2)
1751 			rxtx_bufsz = SZ_16K;
1752 		else
1753 			rxtx_bufsz = SZ_4K;
1754 	}
1755 
1756 	drv_info->rxtx_bufsz = rxtx_bufsz;
1757 	drv_info->rx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
1758 	if (!drv_info->rx_buffer) {
1759 		ret = -ENOMEM;
1760 		goto free_pages;
1761 	}
1762 
1763 	drv_info->tx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL);
1764 	if (!drv_info->tx_buffer) {
1765 		ret = -ENOMEM;
1766 		goto free_pages;
1767 	}
1768 
1769 	ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
1770 			   virt_to_phys(drv_info->rx_buffer),
1771 			   rxtx_bufsz / FFA_PAGE_SIZE);
1772 	if (ret) {
1773 		pr_err("failed to register FFA RxTx buffers\n");
1774 		goto free_pages;
1775 	}
1776 
1777 	mutex_init(&drv_info->rx_lock);
1778 	mutex_init(&drv_info->tx_lock);
1779 
1780 	ffa_drvinfo_flags_init();
1781 
1782 	ffa_notifications_setup();
1783 
1784 	ret = ffa_setup_partitions();
1785 	if (ret) {
1786 		pr_err("failed to setup partitions\n");
1787 		goto cleanup_notifs;
1788 	}
1789 
1790 	ret = ffa_sched_recv_cb_update(drv_info->vm_id, ffa_self_notif_handle,
1791 				       drv_info, true);
1792 	if (ret)
1793 		pr_info("Failed to register driver sched callback %d\n", ret);
1794 
1795 	return 0;
1796 
1797 cleanup_notifs:
1798 	ffa_notifications_cleanup();
1799 free_pages:
1800 	if (drv_info->tx_buffer)
1801 		free_pages_exact(drv_info->tx_buffer, rxtx_bufsz);
1802 	free_pages_exact(drv_info->rx_buffer, rxtx_bufsz);
1803 free_drv_info:
1804 	kfree(drv_info);
1805 	return ret;
1806 }
1807 module_init(ffa_init);
1808 
1809 static void __exit ffa_exit(void)
1810 {
1811 	ffa_notifications_cleanup();
1812 	ffa_partitions_cleanup();
1813 	ffa_rxtx_unmap(drv_info->vm_id);
1814 	free_pages_exact(drv_info->tx_buffer, drv_info->rxtx_bufsz);
1815 	free_pages_exact(drv_info->rx_buffer, drv_info->rxtx_bufsz);
1816 	kfree(drv_info);
1817 }
1818 module_exit(ffa_exit);
1819 
1820 MODULE_ALIAS("arm-ffa");
1821 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
1822 MODULE_DESCRIPTION("Arm FF-A interface driver");
1823 MODULE_LICENSE("GPL v2");
1824