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2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a 
 kernel/drivers/misc/mei/interrupt.c
....@@ -1,19 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
2
- *
3
+ * Copyright (c) 2003-2018, Intel Corporation. All rights reserved.
34  * Intel Management Engine Interface (Intel MEI) Linux driver
4
- * Copyright (c) 2003-2012, Intel Corporation.
5
- *
6
- * This program is free software; you can redistribute it and/or modify it
7
- * under the terms and conditions of the GNU General Public License,
8
- * version 2, as published by the Free Software Foundation.
9
- *
10
- * This program is distributed in the hope it will be useful, but WITHOUT
11
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13
- * more details.
14
- *
155  */
16
-
176 
187 #include <linux/export.h>
198 #include <linux/kthread.h>
....@@ -72,14 +61,21 @@
7261  *
7362  * @dev: mei device
7463  * @hdr: message header
64
+ * @discard_len: the length of the message to discard (excluding header)
7565  */
76
-static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr)
66
+static void mei_irq_discard_msg(struct mei_device *dev, struct mei_msg_hdr *hdr,
67
+				size_t discard_len)
7768 {
69
+	if (hdr->dma_ring) {
70
+		mei_dma_ring_read(dev, NULL,
71
+				  hdr->extension[dev->rd_msg_hdr_count - 2]);
72
+		discard_len = 0;
73
+	}
7874 	/*
7975 	 * no need to check for size as it is guarantied
8076 	 * that length fits into rd_msg_buf
8177 	 */
82
-	mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
78
+	mei_read_slots(dev, dev->rd_msg_buf, discard_len);
8379 	dev_dbg(dev->dev, "discarding message " MEI_HDR_FMT "\n",
8480 		MEI_HDR_PRM(hdr));
8581 }
....@@ -89,17 +85,29 @@
8985  *
9086  * @cl: reading client
9187  * @mei_hdr: header of mei client message
88
+ * @meta: extend meta header
9289  * @cmpl_list: completion list
9390  *
9491  * Return: always 0
9592  */
9693 static int mei_cl_irq_read_msg(struct mei_cl *cl,
9794 			       struct mei_msg_hdr *mei_hdr,
95
+			       struct mei_ext_meta_hdr *meta,
9896 			       struct list_head *cmpl_list)
9997 {
10098 	struct mei_device *dev = cl->dev;
10199 	struct mei_cl_cb *cb;
100
+
102101 	size_t buf_sz;
102
+	u32 length;
103
+	int ext_len;
104
+
105
+	length = mei_hdr->length;
106
+	ext_len = 0;
107
+	if (mei_hdr->extended) {
108
+		ext_len = sizeof(*meta) + mei_slots2data(meta->size);
109
+		length -= ext_len;
110
+	}
103111 
104112 	cb = list_first_entry_or_null(&cl->rd_pending, struct mei_cl_cb, list);
105113 	if (!cb) {
....@@ -113,31 +121,76 @@
113121 		list_add_tail(&cb->list, &cl->rd_pending);
114122 	}
115123 
124
+	if (mei_hdr->extended) {
125
+		struct mei_ext_hdr *ext;
126
+		struct mei_ext_hdr *vtag = NULL;
127
+
128
+		ext = mei_ext_begin(meta);
129
+		do {
130
+			switch (ext->type) {
131
+			case MEI_EXT_HDR_VTAG:
132
+				vtag = ext;
133
+				break;
134
+			case MEI_EXT_HDR_NONE:
135
+				fallthrough;
136
+			default:
137
+				cb->status = -EPROTO;
138
+				break;
139
+			}
140
+
141
+			ext = mei_ext_next(ext);
142
+		} while (!mei_ext_last(meta, ext));
143
+
144
+		if (!vtag) {
145
+			cl_dbg(dev, cl, "vtag not found in extended header.\n");
146
+			cb->status = -EPROTO;
147
+			goto discard;
148
+		}
149
+
150
+		cl_dbg(dev, cl, "vtag: %d\n", vtag->ext_payload[0]);
151
+		if (cb->vtag && cb->vtag != vtag->ext_payload[0]) {
152
+			cl_err(dev, cl, "mismatched tag: %d != %d\n",
153
+			       cb->vtag, vtag->ext_payload[0]);
154
+			cb->status = -EPROTO;
155
+			goto discard;
156
+		}
157
+		cb->vtag = vtag->ext_payload[0];
158
+	}
159
+
116160 	if (!mei_cl_is_connected(cl)) {
117161 		cl_dbg(dev, cl, "not connected\n");
118162 		cb->status = -ENODEV;
119163 		goto discard;
120164 	}
121165 
122
-	buf_sz = mei_hdr->length + cb->buf_idx;
166
+	if (mei_hdr->dma_ring)
167
+		length = mei_hdr->extension[mei_data2slots(ext_len)];
168
+
169
+	buf_sz = length + cb->buf_idx;
123170 	/* catch for integer overflow */
124171 	if (buf_sz < cb->buf_idx) {
125172 		cl_err(dev, cl, "message is too big len %d idx %zu\n",
126
-		       mei_hdr->length, cb->buf_idx);
173
+		       length, cb->buf_idx);
127174 		cb->status = -EMSGSIZE;
128175 		goto discard;
129176 	}
130177 
131178 	if (cb->buf.size < buf_sz) {
132179 		cl_dbg(dev, cl, "message overflow. size %zu len %d idx %zu\n",
133
-			cb->buf.size, mei_hdr->length, cb->buf_idx);
180
+			cb->buf.size, length, cb->buf_idx);
134181 		cb->status = -EMSGSIZE;
135182 		goto discard;
136183 	}
137184 
138
-	mei_read_slots(dev, cb->buf.data + cb->buf_idx, mei_hdr->length);
185
+	if (mei_hdr->dma_ring) {
186
+		mei_dma_ring_read(dev, cb->buf.data + cb->buf_idx, length);
187
+		/*  for DMA read 0 length to generate interrupt to the device */
188
+		mei_read_slots(dev, cb->buf.data + cb->buf_idx, 0);
189
+	} else {
190
+		mei_read_slots(dev, cb->buf.data + cb->buf_idx, length);
191
+	}
139192 
140
-	cb->buf_idx += mei_hdr->length;
193
+	cb->buf_idx += length;
141194 
142195 	if (mei_hdr->msg_complete) {
143196 		cl_dbg(dev, cl, "completed read length = %zu\n", cb->buf_idx);
....@@ -152,7 +205,7 @@
152205 discard:
153206 	if (cb)
154207 		list_move_tail(&cb->list, cmpl_list);
155
-	mei_irq_discard_msg(dev, mei_hdr);
208
+	mei_irq_discard_msg(dev, mei_hdr, length);
156209 	return 0;
157210 }
158211 
....@@ -245,9 +298,17 @@
245298 static inline int hdr_is_valid(u32 msg_hdr)
246299 {
247300 	struct mei_msg_hdr *mei_hdr;
301
+	u32 expected_len = 0;
248302 
249303 	mei_hdr = (struct mei_msg_hdr *)&msg_hdr;
250304 	if (!msg_hdr || mei_hdr->reserved)
305
+		return -EBADMSG;
306
+
307
+	if (mei_hdr->dma_ring)
308
+		expected_len += MEI_SLOT_SIZE;
309
+	if (mei_hdr->extended)
310
+		expected_len += MEI_SLOT_SIZE;
311
+	if (mei_hdr->length < expected_len)
251312 		return -EBADMSG;
252313 
253314 	return 0;
....@@ -267,23 +328,30 @@
267328 			 struct list_head *cmpl_list, s32 *slots)
268329 {
269330 	struct mei_msg_hdr *mei_hdr;
331
+	struct mei_ext_meta_hdr *meta_hdr = NULL;
270332 	struct mei_cl *cl;
271333 	int ret;
334
+	u32 ext_meta_hdr_u32;
335
+	u32 hdr_size_left;
336
+	u32 hdr_size_ext;
337
+	int i;
338
+	int ext_hdr_end;
272339 
273
-	if (!dev->rd_msg_hdr) {
274
-		dev->rd_msg_hdr = mei_read_hdr(dev);
340
+	if (!dev->rd_msg_hdr[0]) {
341
+		dev->rd_msg_hdr[0] = mei_read_hdr(dev);
342
+		dev->rd_msg_hdr_count = 1;
275343 		(*slots)--;
276344 		dev_dbg(dev->dev, "slots =%08x.\n", *slots);
277345 
278
-		ret = hdr_is_valid(dev->rd_msg_hdr);
346
+		ret = hdr_is_valid(dev->rd_msg_hdr[0]);
279347 		if (ret) {
280348 			dev_err(dev->dev, "corrupted message header 0x%08X\n",
281
-				dev->rd_msg_hdr);
349
+				dev->rd_msg_hdr[0]);
282350 			goto end;
283351 		}
284352 	}
285353 
286
-	mei_hdr = (struct mei_msg_hdr *)&dev->rd_msg_hdr;
354
+	mei_hdr = (struct mei_msg_hdr *)dev->rd_msg_hdr;
287355 	dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
288356 
289357 	if (mei_slots2data(*slots) < mei_hdr->length) {
....@@ -292,6 +360,56 @@
292360 		/* we can't read the message */
293361 		ret = -ENODATA;
294362 		goto end;
363
+	}
364
+
365
+	ext_hdr_end = 1;
366
+	hdr_size_left = mei_hdr->length;
367
+
368
+	if (mei_hdr->extended) {
369
+		if (!dev->rd_msg_hdr[1]) {
370
+			ext_meta_hdr_u32 = mei_read_hdr(dev);
371
+			dev->rd_msg_hdr[1] = ext_meta_hdr_u32;
372
+			dev->rd_msg_hdr_count++;
373
+			(*slots)--;
374
+			dev_dbg(dev->dev, "extended header is %08x\n",
375
+				ext_meta_hdr_u32);
376
+		}
377
+		meta_hdr = ((struct mei_ext_meta_hdr *)dev->rd_msg_hdr + 1);
378
+		if (check_add_overflow((u32)sizeof(*meta_hdr),
379
+				       mei_slots2data(meta_hdr->size),
380
+				       &hdr_size_ext)) {
381
+			dev_err(dev->dev, "extended message size too big %d\n",
382
+				meta_hdr->size);
383
+			return -EBADMSG;
384
+		}
385
+		if (hdr_size_left < hdr_size_ext) {
386
+			dev_err(dev->dev, "corrupted message header len %d\n",
387
+				mei_hdr->length);
388
+			return -EBADMSG;
389
+		}
390
+		hdr_size_left -= hdr_size_ext;
391
+
392
+		ext_hdr_end = meta_hdr->size + 2;
393
+		for (i = dev->rd_msg_hdr_count; i < ext_hdr_end; i++) {
394
+			dev->rd_msg_hdr[i] = mei_read_hdr(dev);
395
+			dev_dbg(dev->dev, "extended header %d is %08x\n", i,
396
+				dev->rd_msg_hdr[i]);
397
+			dev->rd_msg_hdr_count++;
398
+			(*slots)--;
399
+		}
400
+	}
401
+
402
+	if (mei_hdr->dma_ring) {
403
+		if (hdr_size_left != sizeof(dev->rd_msg_hdr[ext_hdr_end])) {
404
+			dev_err(dev->dev, "corrupted message header len %d\n",
405
+				mei_hdr->length);
406
+			return -EBADMSG;
407
+		}
408
+
409
+		dev->rd_msg_hdr[ext_hdr_end] = mei_read_hdr(dev);
410
+		dev->rd_msg_hdr_count++;
411
+		(*slots)--;
412
+		mei_hdr->length -= sizeof(dev->rd_msg_hdr[ext_hdr_end]);
295413 	}
296414 
297415 	/*  HBM message */
....@@ -309,37 +427,32 @@
309427 	list_for_each_entry(cl, &dev->file_list, link) {
310428 		if (mei_cl_hbm_equal(cl, mei_hdr)) {
311429 			cl_dbg(dev, cl, "got a message\n");
312
-			break;
430
+			ret = mei_cl_irq_read_msg(cl, mei_hdr, meta_hdr, cmpl_list);
431
+			goto reset_slots;
313432 		}
314433 	}
315434 
316435 	/* if no recipient cl was found we assume corrupted header */
317
-	if (&cl->link == &dev->file_list) {
318
-		/* A message for not connected fixed address clients
319
-		 * should be silently discarded
320
-		 * On power down client may be force cleaned,
321
-		 * silently discard such messages
322
-		 */
323
-		if (hdr_is_fixed(mei_hdr) ||
324
-		    dev->dev_state == MEI_DEV_POWER_DOWN) {
325
-			mei_irq_discard_msg(dev, mei_hdr);
326
-			ret = 0;
327
-			goto reset_slots;
328
-		}
329
-		dev_err(dev->dev, "no destination client found 0x%08X\n",
330
-				dev->rd_msg_hdr);
331
-		ret = -EBADMSG;
332
-		goto end;
436
+	/* A message for not connected fixed address clients
437
+	 * should be silently discarded
438
+	 * On power down client may be force cleaned,
439
+	 * silently discard such messages
440
+	 */
441
+	if (hdr_is_fixed(mei_hdr) ||
442
+	    dev->dev_state == MEI_DEV_POWER_DOWN) {
443
+		mei_irq_discard_msg(dev, mei_hdr, mei_hdr->length);
444
+		ret = 0;
445
+		goto reset_slots;
333446 	}
334
-
335
-	ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
336
-
447
+	dev_err(dev->dev, "no destination client found 0x%08X\n", dev->rd_msg_hdr[0]);
448
+	ret = -EBADMSG;
449
+	goto end;
337450 
338451 reset_slots:
339452 	/* reset the number of slots and header */
453
+	memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
454
+	dev->rd_msg_hdr_count = 0;
340455 	*slots = mei_count_full_read_slots(dev);
341
-	dev->rd_msg_hdr = 0;
342
-
343456 	if (*slots == -EOVERFLOW) {
344457 		/* overflow - reset */
345458 		dev_err(dev->dev, "resetting due to slots overflow.\n");