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2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390 
 kernel/drivers/soc/qcom/smem.c
....@@ -1,15 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (c) 2015, Sony Mobile Communications AB.
34  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
4
- *
5
- * This program is free software; you can redistribute it and/or modify
6
- * it under the terms of the GNU General Public License version 2 and
7
- * only version 2 as published by the Free Software Foundation.
8
- *
9
- * This program is distributed in the hope that it will be useful,
10
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12
- * GNU General Public License for more details.
135  */
146 
157 #include <linux/hwspinlock.h>
....@@ -18,6 +10,7 @@
1810 #include <linux/of.h>
1911 #include <linux/of_address.h>
2012 #include <linux/platform_device.h>
13
+#include <linux/sizes.h>
2114 #include <linux/slab.h>
2215 #include <linux/soc/qcom/smem.h>
2316 
....@@ -91,7 +84,7 @@
9184 #define SMEM_GLOBAL_HOST	0xfffe
9285 
9386 /* Max number of processors/hosts in a system */
94
-#define SMEM_HOST_COUNT		10
87
+#define SMEM_HOST_COUNT		11
9588 
9689 /**
9790   * struct smem_proc_comm - proc_comm communication struct (legacy)
....@@ -275,9 +268,10 @@
275268 	struct smem_partition_header *partitions[SMEM_HOST_COUNT];
276269 	size_t cacheline[SMEM_HOST_COUNT];
277270 	u32 item_count;
271
+	struct platform_device *socinfo;
278272 
279273 	unsigned num_regions;
280
-	struct smem_region regions[0];
274
+	struct smem_region regions[];
281275 };
282276 
283277 static void *
....@@ -489,7 +483,7 @@
489483 				  size_t *size)
490484 {
491485 	struct smem_header *header;
492
-	struct smem_region *area;
486
+	struct smem_region *region;
493487 	struct smem_global_entry *entry;
494488 	u32 aux_base;
495489 	unsigned i;
....@@ -502,12 +496,12 @@
502496 	aux_base = le32_to_cpu(entry->aux_base) & AUX_BASE_MASK;
503497 
504498 	for (i = 0; i < smem->num_regions; i++) {
505
-		area = &smem->regions[i];
499
+		region = &smem->regions[i];
506500 
507
-		if (area->aux_base == aux_base || !aux_base) {
501
+		if (region->aux_base == aux_base || !aux_base) {
508502 			if (size != NULL)
509503 				*size = le32_to_cpu(entry->size);
510
-			return area->virt_base + le32_to_cpu(entry->offset);
504
+			return region->virt_base + le32_to_cpu(entry->offset);
511505 		}
512506 	}
513507 
....@@ -722,12 +716,59 @@
722716 	return le16_to_cpu(info->num_items);
723717 }
724718 
719
+/*
720
+ * Validate the partition header for a partition whose partition
721
+ * table entry is supplied.  Returns a pointer to its header if
722
+ * valid, or a null pointer otherwise.
723
+ */
724
+static struct smem_partition_header *
725
+qcom_smem_partition_header(struct qcom_smem *smem,
726
+		struct smem_ptable_entry *entry, u16 host0, u16 host1)
727
+{
728
+	struct smem_partition_header *header;
729
+	u32 size;
730
+
731
+	header = smem->regions[0].virt_base + le32_to_cpu(entry->offset);
732
+
733
+	if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) {
734
+		dev_err(smem->dev, "bad partition magic %02x %02x %02x %02x\n",
735
+			header->magic[0], header->magic[1],
736
+			header->magic[2], header->magic[3]);
737
+		return NULL;
738
+	}
739
+
740
+	if (host0 != le16_to_cpu(header->host0)) {
741
+		dev_err(smem->dev, "bad host0 (%hu != %hu)\n",
742
+				host0, le16_to_cpu(header->host0));
743
+		return NULL;
744
+	}
745
+	if (host1 != le16_to_cpu(header->host1)) {
746
+		dev_err(smem->dev, "bad host1 (%hu != %hu)\n",
747
+				host1, le16_to_cpu(header->host1));
748
+		return NULL;
749
+	}
750
+
751
+	size = le32_to_cpu(header->size);
752
+	if (size != le32_to_cpu(entry->size)) {
753
+		dev_err(smem->dev, "bad partition size (%u != %u)\n",
754
+			size, le32_to_cpu(entry->size));
755
+		return NULL;
756
+	}
757
+
758
+	if (le32_to_cpu(header->offset_free_uncached) > size) {
759
+		dev_err(smem->dev, "bad partition free uncached (%u > %u)\n",
760
+			le32_to_cpu(header->offset_free_uncached), size);
761
+		return NULL;
762
+	}
763
+
764
+	return header;
765
+}
766
+
725767 static int qcom_smem_set_global_partition(struct qcom_smem *smem)
726768 {
727769 	struct smem_partition_header *header;
728770 	struct smem_ptable_entry *entry;
729771 	struct smem_ptable *ptable;
730
-	u32 host0, host1, size;
731772 	bool found = false;
732773 	int i;
733774 
....@@ -742,10 +783,15 @@
742783 
743784 	for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) {
744785 		entry = &ptable->entry[i];
745
-		host0 = le16_to_cpu(entry->host0);
746
-		host1 = le16_to_cpu(entry->host1);
786
+		if (!le32_to_cpu(entry->offset))
787
+			continue;
788
+		if (!le32_to_cpu(entry->size))
789
+			continue;
747790 
748
-		if (host0 == SMEM_GLOBAL_HOST && host0 == host1) {
791
+		if (le16_to_cpu(entry->host0) != SMEM_GLOBAL_HOST)
792
+			continue;
793
+
794
+		if (le16_to_cpu(entry->host1) == SMEM_GLOBAL_HOST) {
749795 			found = true;
750796 			break;
751797 		}
....@@ -756,36 +802,10 @@
756802 		return -EINVAL;
757803 	}
758804 
759
-	if (!le32_to_cpu(entry->offset) || !le32_to_cpu(entry->size)) {
760
-		dev_err(smem->dev, "Invalid entry for global partition\n");
805
+	header = qcom_smem_partition_header(smem, entry,
806
+				SMEM_GLOBAL_HOST, SMEM_GLOBAL_HOST);
807
+	if (!header)
761808 		return -EINVAL;
762
-	}
763
-
764
-	header = smem->regions[0].virt_base + le32_to_cpu(entry->offset);
765
-	host0 = le16_to_cpu(header->host0);
766
-	host1 = le16_to_cpu(header->host1);
767
-
768
-	if (memcmp(header->magic, SMEM_PART_MAGIC, sizeof(header->magic))) {
769
-		dev_err(smem->dev, "Global partition has invalid magic\n");
770
-		return -EINVAL;
771
-	}
772
-
773
-	if (host0 != SMEM_GLOBAL_HOST && host1 != SMEM_GLOBAL_HOST) {
774
-		dev_err(smem->dev, "Global partition hosts are invalid\n");
775
-		return -EINVAL;
776
-	}
777
-
778
-	if (le32_to_cpu(header->size) != le32_to_cpu(entry->size)) {
779
-		dev_err(smem->dev, "Global partition has invalid size\n");
780
-		return -EINVAL;
781
-	}
782
-
783
-	size = le32_to_cpu(header->offset_free_uncached);
784
-	if (size > le32_to_cpu(header->size)) {
785
-		dev_err(smem->dev,
786
-			"Global partition has invalid free pointer\n");
787
-		return -EINVAL;
788
-	}
789809 
790810 	smem->global_partition = header;
791811 	smem->global_cacheline = le32_to_cpu(entry->cacheline);
....@@ -793,14 +813,14 @@
793813 	return 0;
794814 }
795815 
796
-static int qcom_smem_enumerate_partitions(struct qcom_smem *smem,
797
-					  unsigned int local_host)
816
+static int
817
+qcom_smem_enumerate_partitions(struct qcom_smem *smem, u16 local_host)
798818 {
799819 	struct smem_partition_header *header;
800820 	struct smem_ptable_entry *entry;
801821 	struct smem_ptable *ptable;
802822 	unsigned int remote_host;
803
-	u32 host0, host1;
823
+	u16 host0, host1;
804824 	int i;
805825 
806826 	ptable = qcom_smem_get_ptable(smem);
....@@ -809,71 +829,33 @@
809829 
810830 	for (i = 0; i < le32_to_cpu(ptable->num_entries); i++) {
811831 		entry = &ptable->entry[i];
812
-		host0 = le16_to_cpu(entry->host0);
813
-		host1 = le16_to_cpu(entry->host1);
814
-
815
-		if (host0 != local_host && host1 != local_host)
816
-			continue;
817
-
818832 		if (!le32_to_cpu(entry->offset))
819833 			continue;
820
-
821834 		if (!le32_to_cpu(entry->size))
822835 			continue;
823836 
837
+		host0 = le16_to_cpu(entry->host0);
838
+		host1 = le16_to_cpu(entry->host1);
824839 		if (host0 == local_host)
825840 			remote_host = host1;
826
-		else
841
+		else if (host1 == local_host)
827842 			remote_host = host0;
843
+		else
844
+			continue;
828845 
829846 		if (remote_host >= SMEM_HOST_COUNT) {
830
-			dev_err(smem->dev,
831
-				"Invalid remote host %d\n",
832
-				remote_host);
847
+			dev_err(smem->dev, "bad host %hu\n", remote_host);
833848 			return -EINVAL;
834849 		}
835850 
836851 		if (smem->partitions[remote_host]) {
837
-			dev_err(smem->dev,
838
-				"Already found a partition for host %d\n",
839
-				remote_host);
852
+			dev_err(smem->dev, "duplicate host %hu\n", remote_host);
840853 			return -EINVAL;
841854 		}
842855 
843
-		header = smem->regions[0].virt_base + le32_to_cpu(entry->offset);
844
-		host0 = le16_to_cpu(header->host0);
845
-		host1 = le16_to_cpu(header->host1);
846
-
847
-		if (memcmp(header->magic, SMEM_PART_MAGIC,
848
-			    sizeof(header->magic))) {
849
-			dev_err(smem->dev,
850
-				"Partition %d has invalid magic\n", i);
856
+		header = qcom_smem_partition_header(smem, entry, host0, host1);
857
+		if (!header)
851858 			return -EINVAL;
852
-		}
853
-
854
-		if (host0 != local_host && host1 != local_host) {
855
-			dev_err(smem->dev,
856
-				"Partition %d hosts are invalid\n", i);
857
-			return -EINVAL;
858
-		}
859
-
860
-		if (host0 != remote_host && host1 != remote_host) {
861
-			dev_err(smem->dev,
862
-				"Partition %d hosts are invalid\n", i);
863
-			return -EINVAL;
864
-		}
865
-
866
-		if (le32_to_cpu(header->size) != le32_to_cpu(entry->size)) {
867
-			dev_err(smem->dev,
868
-				"Partition %d has invalid size\n", i);
869
-			return -EINVAL;
870
-		}
871
-
872
-		if (le32_to_cpu(header->offset_free_uncached) > le32_to_cpu(header->size)) {
873
-			dev_err(smem->dev,
874
-				"Partition %d has invalid free pointer\n", i);
875
-			return -EINVAL;
876
-		}
877859 
878860 		smem->partitions[remote_host] = header;
879861 		smem->cacheline[remote_host] = le32_to_cpu(entry->cacheline);
....@@ -887,6 +869,7 @@
887869 {
888870 	struct device_node *np;
889871 	struct resource r;
872
+	resource_size_t size;
890873 	int ret;
891874 
892875 	np = of_parse_phandle(dev->of_node, name, 0);
....@@ -899,12 +882,13 @@
899882 	of_node_put(np);
900883 	if (ret)
901884 		return ret;
885
+	size = resource_size(&r);
902886 
903
-	smem->regions[i].aux_base = (u32)r.start;
904
-	smem->regions[i].size = resource_size(&r);
905
-	smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, resource_size(&r));
887
+	smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, size);
906888 	if (!smem->regions[i].virt_base)
907889 		return -ENOMEM;
890
+	smem->regions[i].aux_base = (u32)r.start;
891
+	smem->regions[i].size = size;
908892 
909893 	return 0;
910894 }
....@@ -962,6 +946,7 @@
962946 		return -EINVAL;
963947 	}
964948 
949
+	BUILD_BUG_ON(SMEM_HOST_APPS >= SMEM_HOST_COUNT);
965950 	ret = qcom_smem_enumerate_partitions(smem, SMEM_HOST_APPS);
966951 	if (ret < 0 && ret != -ENOENT)
967952 		return ret;
....@@ -979,11 +964,19 @@
979964 
980965 	__smem = smem;
981966 
967
+	smem->socinfo = platform_device_register_data(&pdev->dev, "qcom-socinfo",
968
+						      PLATFORM_DEVID_NONE, NULL,
969
+						      0);
970
+	if (IS_ERR(smem->socinfo))
971
+		dev_dbg(&pdev->dev, "failed to register socinfo device\n");
972
+
982973 	return 0;
983974 }
984975 
985976 static int qcom_smem_remove(struct platform_device *pdev)
986977 {
978
+	platform_device_unregister(__smem->socinfo);
979
+
987980 	hwspin_lock_free(__smem->hwlock);
988981 	__smem = NULL;
989982