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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
....@@ -1,19 +1,9 @@
1
+// SPDX-License-Identifier: ISC
12 /*
23  * Copyright (c) 2013 Broadcom Corporation
3
- *
4
- * Permission to use, copy, modify, and/or distribute this software for any
5
- * purpose with or without fee is hereby granted, provided that the above
6
- * copyright notice and this permission notice appear in all copies.
7
- *
8
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
154  */
165 
6
+#include <linux/efi.h>
177 #include <linux/kernel.h>
188 #include <linux/slab.h>
199 #include <linux/device.h>
....@@ -46,7 +36,7 @@
4636  * @state: current parser state.
4737  * @data: input buffer being parsed.
4838  * @nvram: output buffer with parse result.
49
- * @nvram_len: lenght of parse result.
39
+ * @nvram_len: length of parse result.
5040  * @line: current line.
5141  * @column: current column in line.
5242  * @pos: byte offset in input buffer.
....@@ -69,7 +59,7 @@
6959 	bool boardrev_found;
7060 };
7161 
72
-/**
62
+/*
7363  * is_nvram_char() - check if char is a valid one for NVRAM entry
7464  *
7565  * It accepts all printable ASCII chars except for '#' which opens a comment.
....@@ -217,6 +207,8 @@
217207 		size = BRCMF_FW_MAX_NVRAM_SIZE;
218208 	else
219209 		size = data_len;
210
+	/* Add space for properties we may add */
211
+	size += strlen(BRCMF_FW_DEFAULT_BOARDREV) + 1;
220212 	/* Alloc for extra 0 byte + roundup by 4 + length field */
221213 	size += 1 + 3 + sizeof(u32);
222214 	nvp->nvram = kzalloc(size, GFP_KERNEL);
....@@ -445,6 +437,75 @@
445437 
446438 static void brcmf_fw_request_done(const struct firmware *fw, void *ctx);
447439 
440
+#ifdef CONFIG_EFI
441
+/* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV"
442
+ * to specify "worldwide" compatible settings, but these 2 ccode-s do not work
443
+ * properly. "ccode=ALL" causes channels 12 and 13 to not be available,
444
+ * "ccode=XV" causes all 5GHz channels to not be available. So we replace both
445
+ * with "ccode=X2" which allows channels 12+13 and 5Ghz channels in
446
+ * no-Initiate-Radiation mode. This means that we will never send on these
447
+ * channels without first having received valid wifi traffic on the channel.
448
+ */
449
+static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len)
450
+{
451
+	char *ccode;
452
+
453
+	ccode = strnstr((char *)data, "ccode=ALL", data_len);
454
+	if (!ccode)
455
+		ccode = strnstr((char *)data, "ccode=XV\r", data_len);
456
+	if (!ccode)
457
+		return;
458
+
459
+	ccode[6] = 'X';
460
+	ccode[7] = '2';
461
+	ccode[8] = '\r';
462
+}
463
+
464
+static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret)
465
+{
466
+	const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 };
467
+	struct efivar_entry *nvram_efivar;
468
+	unsigned long data_len = 0;
469
+	u8 *data = NULL;
470
+	int err;
471
+
472
+	nvram_efivar = kzalloc(sizeof(*nvram_efivar), GFP_KERNEL);
473
+	if (!nvram_efivar)
474
+		return NULL;
475
+
476
+	memcpy(&nvram_efivar->var.VariableName, name, sizeof(name));
477
+	nvram_efivar->var.VendorGuid = EFI_GUID(0x74b00bd9, 0x805a, 0x4d61,
478
+						0xb5, 0x1f, 0x43, 0x26,
479
+						0x81, 0x23, 0xd1, 0x13);
480
+
481
+	err = efivar_entry_size(nvram_efivar, &data_len);
482
+	if (err)
483
+		goto fail;
484
+
485
+	data = kmalloc(data_len, GFP_KERNEL);
486
+	if (!data)
487
+		goto fail;
488
+
489
+	err = efivar_entry_get(nvram_efivar, NULL, &data_len, data);
490
+	if (err)
491
+		goto fail;
492
+
493
+	brcmf_fw_fix_efi_nvram_ccode(data, data_len);
494
+	brcmf_info("Using nvram EFI variable\n");
495
+
496
+	kfree(nvram_efivar);
497
+	*data_len_ret = data_len;
498
+	return data;
499
+
500
+fail:
501
+	kfree(data);
502
+	kfree(nvram_efivar);
503
+	return NULL;
504
+}
505
+#else
506
+static inline u8 *brcmf_fw_nvram_from_efi(size_t *data_len) { return NULL; }
507
+#endif
508
+
448509 static void brcmf_fw_free_request(struct brcmf_fw_request *req)
449510 {
450511 	struct brcmf_fw_item *item;
....@@ -463,11 +524,12 @@
463524 {
464525 	struct brcmf_fw *fwctx = ctx;
465526 	struct brcmf_fw_item *cur;
527
+	bool free_bcm47xx_nvram = false;
528
+	bool kfree_nvram = false;
466529 	u32 nvram_length = 0;
467530 	void *nvram = NULL;
468531 	u8 *data = NULL;
469532 	size_t data_len;
470
-	bool raw_nvram;
471533 
472534 	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev));
473535 
....@@ -476,12 +538,13 @@
476538 	if (fw && fw->data) {
477539 		data = (u8 *)fw->data;
478540 		data_len = fw->size;
479
-		raw_nvram = false;
480541 	} else {
481
-		data = bcm47xx_nvram_get_contents(&data_len);
482
-		if (!data && !(cur->flags & BRCMF_FW_REQF_OPTIONAL))
542
+		if ((data = bcm47xx_nvram_get_contents(&data_len)))
543
+			free_bcm47xx_nvram = true;
544
+		else if ((data = brcmf_fw_nvram_from_efi(&data_len)))
545
+			kfree_nvram = true;
546
+		else if (!(cur->flags & BRCMF_FW_REQF_OPTIONAL))
483547 			goto fail;
484
-		raw_nvram = true;
485548 	}
486549 
487550 	if (data)
....@@ -489,8 +552,11 @@
489552 					     fwctx->req->domain_nr,
490553 					     fwctx->req->bus_nr);
491554 
492
-	if (raw_nvram)
555
+	if (free_bcm47xx_nvram)
493556 		bcm47xx_nvram_release_contents(data);
557
+	if (kfree_nvram)
558
+		kfree(data);
559
+
494560 	release_firmware(fw);
495561 	if (!nvram && !(cur->flags & BRCMF_FW_REQF_OPTIONAL))
496562 		goto fail;
....@@ -504,90 +570,75 @@
504570 	return -ENOENT;
505571 }
506572 
507
-static int brcmf_fw_request_next_item(struct brcmf_fw *fwctx, bool async)
573
+static int brcmf_fw_complete_request(const struct firmware *fw,
574
+				     struct brcmf_fw *fwctx)
508575 {
509
-	struct brcmf_fw_item *cur;
510
-	const struct firmware *fw = NULL;
511
-	int ret;
512
-
513
-	cur = &fwctx->req->items[fwctx->curpos];
514
-
515
-	brcmf_dbg(TRACE, "%srequest for %s\n", async ? "async " : "",
516
-		  cur->path);
517
-
518
-	if (async)
519
-		ret = request_firmware_nowait(THIS_MODULE, true, cur->path,
520
-					      fwctx->dev, GFP_KERNEL, fwctx,
521
-					      brcmf_fw_request_done);
522
-	else
523
-		ret = request_firmware(&fw, cur->path, fwctx->dev);
524
-
525
-	if (ret < 0) {
526
-		brcmf_fw_request_done(NULL, fwctx);
527
-	} else if (!async && fw) {
528
-		brcmf_dbg(TRACE, "firmware %s %sfound\n", cur->path,
529
-			  fw ? "" : "not ");
530
-		if (cur->type == BRCMF_FW_TYPE_BINARY)
531
-			cur->binary = fw;
532
-		else if (cur->type == BRCMF_FW_TYPE_NVRAM)
533
-			brcmf_fw_request_nvram_done(fw, fwctx);
534
-		else
535
-			release_firmware(fw);
536
-
537
-		return -EAGAIN;
538
-	}
539
-	return 0;
540
-}
541
-
542
-static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
543
-{
544
-	struct brcmf_fw *fwctx = ctx;
545
-	struct brcmf_fw_item *cur;
576
+	struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos];
546577 	int ret = 0;
547578 
548
-	cur = &fwctx->req->items[fwctx->curpos];
549
-
550
-	brcmf_dbg(TRACE, "enter: firmware %s %sfound\n", cur->path,
551
-		  fw ? "" : "not ");
552
-
553
-	if (!fw)
554
-		ret = -ENOENT;
579
+	brcmf_dbg(TRACE, "firmware %s %sfound\n", cur->path, fw ? "" : "not ");
555580 
556581 	switch (cur->type) {
557582 	case BRCMF_FW_TYPE_NVRAM:
558583 		ret = brcmf_fw_request_nvram_done(fw, fwctx);
559584 		break;
560585 	case BRCMF_FW_TYPE_BINARY:
561
-		cur->binary = fw;
586
+		if (fw)
587
+			cur->binary = fw;
588
+		else
589
+			ret = -ENOENT;
562590 		break;
563591 	default:
564592 		/* something fishy here so bail out early */
565593 		brcmf_err("unknown fw type: %d\n", cur->type);
566594 		release_firmware(fw);
567595 		ret = -EINVAL;
568
-		goto fail;
569596 	}
570597 
571
-	if (ret < 0 && !(cur->flags & BRCMF_FW_REQF_OPTIONAL))
572
-		goto fail;
598
+	return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret;
599
+}
573600 
574
-	do {
575
-		if (++fwctx->curpos == fwctx->req->n_items) {
576
-			ret = 0;
577
-			goto done;
578
-		}
601
+static int brcmf_fw_request_firmware(const struct firmware **fw,
602
+				     struct brcmf_fw *fwctx)
603
+{
604
+	struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos];
605
+	int ret;
579606 
580
-		ret = brcmf_fw_request_next_item(fwctx, false);
581
-	} while (ret == -EAGAIN);
607
+	/* nvram files are board-specific, first try a board-specific path */
608
+	if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) {
609
+		char alt_path[BRCMF_FW_NAME_LEN];
582610 
583
-	return;
611
+		strlcpy(alt_path, cur->path, BRCMF_FW_NAME_LEN);
612
+		/* strip .txt at the end */
613
+		alt_path[strlen(alt_path) - 4] = 0;
614
+		strlcat(alt_path, ".", BRCMF_FW_NAME_LEN);
615
+		strlcat(alt_path, fwctx->req->board_type, BRCMF_FW_NAME_LEN);
616
+		strlcat(alt_path, ".txt", BRCMF_FW_NAME_LEN);
584617 
585
-fail:
586
-	brcmf_dbg(TRACE, "failed err=%d: dev=%s, fw=%s\n", ret,
587
-		  dev_name(fwctx->dev), cur->path);
588
-	brcmf_fw_free_request(fwctx->req);
589
-	fwctx->req = NULL;
590
-done:
618
+		ret = request_firmware(fw, alt_path, fwctx->dev);
619
+		if (ret == 0)
620
+			return ret;
621
+	}
622
+
623
+	return request_firmware(fw, cur->path, fwctx->dev);
624
+}
625
+
626
+static void brcmf_fw_request_done(const struct firmware *fw, void *ctx)
627
+{
628
+	struct brcmf_fw *fwctx = ctx;
629
+	int ret;
630
+
631
+	ret = brcmf_fw_complete_request(fw, fwctx);
632
+
633
+	while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) {
634
+		brcmf_fw_request_firmware(&fw, fwctx);
635
+		ret = brcmf_fw_complete_request(fw, ctx);
636
+	}
637
+
638
+	if (ret) {
639
+		brcmf_fw_free_request(fwctx->req);
640
+		fwctx->req = NULL;
641
+	}
591642 	fwctx->done(fwctx->dev, ret, fwctx->req);
592643 	kfree(fwctx);
593644 }
....@@ -611,7 +662,9 @@
611662 			   void (*fw_cb)(struct device *dev, int err,
612663 					 struct brcmf_fw_request *req))
613664 {
665
+	struct brcmf_fw_item *first = &req->items[0];
614666 	struct brcmf_fw *fwctx;
667
+	int ret;
615668 
616669 	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev));
617670 	if (!fw_cb)
....@@ -628,7 +681,12 @@
628681 	fwctx->req = req;
629682 	fwctx->done = fw_cb;
630683 
631
-	brcmf_fw_request_next_item(fwctx, true);
684
+	ret = request_firmware_nowait(THIS_MODULE, true, first->path,
685
+				      fwctx->dev, GFP_KERNEL, fwctx,
686
+				      brcmf_fw_request_done);
687
+	if (ret < 0)
688
+		brcmf_fw_request_done(NULL, fwctx);
689
+
632690 	return 0;
633691 }
634692 
....@@ -644,7 +702,6 @@
644702 	size_t mp_path_len;
645703 	u32 i, j;
646704 	char end = '\0';
647
-	size_t reqsz;
648705 
649706 	for (i = 0; i < table_size; i++) {
650707 		if (mapping_table[i].chipid == chip &&
....@@ -652,17 +709,16 @@
652709 			break;
653710 	}
654711 
712
+	brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname));
713
+
655714 	if (i == table_size) {
656
-		brcmf_err("Unknown chipid %d [%d]\n", chip, chiprev);
715
+		brcmf_err("Unknown chip %s\n", chipname);
657716 		return NULL;
658717 	}
659718 
660
-	reqsz = sizeof(*fwreq) + n_fwnames * sizeof(struct brcmf_fw_item);
661
-	fwreq = kzalloc(reqsz, GFP_KERNEL);
719
+	fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL);
662720 	if (!fwreq)
663721 		return NULL;
664
-
665
-	brcmf_chip_name(chip, chiprev, chipname, sizeof(chipname));
666722 
667723 	brcmf_info("using %s for chip %s\n",
668724 		   mapping_table[i].fw_base, chipname);
....@@ -676,6 +732,7 @@
676732 
677733 	for (j = 0; j < n_fwnames; j++) {
678734 		fwreq->items[j].path = fwnames[j].path;
735
+		fwnames[j].path[0] = '\0';
679736 		/* check if firmware path is provided by module parameter */
680737 		if (brcmf_mp_global.firmware_path[0] != '\0') {
681738 			strlcpy(fwnames[j].path, mp_path,