[PATCH v6 5/5] soc: qcom: socinfo: Expose image information

[Vaishali Thakkar <vaishali.thakkar@xxxxxxxxxx>]

The socinfo driver provides information about version of the various
images loaded in the system. Expose this to user space for debugging
purpose.

Signed-off-by: Vaishali Thakkar <vaishali.thakkar@xxxxxxxxxx>
---
Changes since v5:
	- No code changes, fix diff.context setting for formatting
          patches. Version 5 was adding context at the bottom of
          the file with 'git am'.
Changes since v4:
	- Reduce number of duplicate image macros and functions
	- Introduce array for image info debugfs entries and use it
	  instead of open coding
Changes since v3:
        - Remove extra debugfs directory creation checks
Changes since v2:
        - None
Changes since v1:
        - None
---
 drivers/soc/qcom/socinfo.c | 84 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/drivers/soc/qcom/socinfo.c b/drivers/soc/qcom/socinfo.c
index 6a4795433d57..855353bed19e 100644
--- a/drivers/soc/qcom/socinfo.c
+++ b/drivers/soc/qcom/socinfo.c
@@ -32,6 +32,39 @@
 #define SMEM_HW_SW_BUILD_ID            137
 
 #ifdef CONFIG_DEBUG_FS
+#define SMEM_IMAGE_VERSION_BLOCKS_COUNT        32
+#define SMEM_IMAGE_VERSION_SIZE                4096
+#define SMEM_IMAGE_VERSION_NAME_SIZE           75
+#define SMEM_IMAGE_VERSION_VARIANT_SIZE        20
+#define SMEM_IMAGE_VERSION_OEM_SIZE            32
+
+/*
+ * SMEM Image table indices
+ */
+#define SMEM_IMAGE_TABLE_BOOT_INDEX     0
+#define SMEM_IMAGE_TABLE_TZ_INDEX       1
+#define SMEM_IMAGE_TABLE_RPM_INDEX      3
+#define SMEM_IMAGE_TABLE_APPS_INDEX     10
+#define SMEM_IMAGE_TABLE_MPSS_INDEX     11
+#define SMEM_IMAGE_TABLE_ADSP_INDEX     12
+#define SMEM_IMAGE_TABLE_CNSS_INDEX     13
+#define SMEM_IMAGE_TABLE_VIDEO_INDEX    14
+#define SMEM_IMAGE_VERSION_TABLE       469
+
+/*
+ * SMEM Image table names
+ */
+static const char *const socinfo_image_names[] = {
+	[SMEM_IMAGE_TABLE_ADSP_INDEX] = "adsp",
+	[SMEM_IMAGE_TABLE_APPS_INDEX] = "apps",
+	[SMEM_IMAGE_TABLE_BOOT_INDEX] = "boot",
+	[SMEM_IMAGE_TABLE_CNSS_INDEX] = "cnss",
+	[SMEM_IMAGE_TABLE_MPSS_INDEX] = "mpss",
+	[SMEM_IMAGE_TABLE_RPM_INDEX] = "rpm",
+	[SMEM_IMAGE_TABLE_TZ_INDEX] = "tz",
+	[SMEM_IMAGE_TABLE_VIDEO_INDEX] = "video",
+};
+
 static const char *const pmic_models[] = {
 	[0]  = "Unknown PMIC model",
 	[9]  = "PM8994",
@@ -103,6 +136,13 @@ struct socinfo_params {
 	u32 hw_plat;
 	u32 fmt;
 };
+
+struct smem_image_version {
+	char name[SMEM_IMAGE_VERSION_NAME_SIZE];
+	char variant[SMEM_IMAGE_VERSION_VARIANT_SIZE];
+	char pad;
+	char oem[SMEM_IMAGE_VERSION_OEM_SIZE];
+};
 #endif /* CONFIG_DEBUG_FS */
 
 struct qcom_socinfo {
@@ -230,10 +270,37 @@ QCOM_OPEN(build_id, qcom_show_build_id);
 QCOM_OPEN(pmic_model, qcom_show_pmic_model);
 QCOM_OPEN(pmic_die_rev, qcom_show_pmic_die_revision);
 
+#define DEFINE_IMAGE_OPS(type)					\
+static int show_image_##type(struct seq_file *seq, void *p)		  \
+{								  \
+	struct smem_image_version *image_version = seq->private;  \
+	seq_puts(seq, image_version->type);			  \
+	seq_puts(seq, "\n");					  \
+	return 0;						  \
+}								  \
+static int open_image_##type(struct inode *inode, struct file *file)	  \
+{									  \
+	return single_open(file, show_image_##type, inode->i_private); \
+}									  \
+									  \
+static const struct file_operations qcom_image_##type##_ops = {	  \
+	.open = open_image_##type,					  \
+	.read = seq_read,						  \
+	.llseek = seq_lseek,						  \
+	.release = single_release,					  \
+}
+
+DEFINE_IMAGE_OPS(name);
+DEFINE_IMAGE_OPS(variant);
+DEFINE_IMAGE_OPS(oem);
+
 static void socinfo_debugfs_init(struct qcom_socinfo *qcom_socinfo,
 				 struct socinfo *info)
 {
+	struct smem_image_version *versions;
+	struct dentry *dentry;
 	size_t size;
+	int i;
 
 	qcom_socinfo->dbg_root = debugfs_create_dir("qcom_socinfo", NULL);
 
@@ -302,6 +369,23 @@ static void socinfo_debugfs_init(struct qcom_socinfo *qcom_socinfo,
 		DEBUGFS_ADD(info, build_id);
 		break;
 	}
+
+	versions = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_IMAGE_VERSION_TABLE,
+				 &size);
+
+	for (i = 0; i < ARRAY_SIZE(socinfo_image_names); i++) {
+		if (!socinfo_image_names[i])
+			continue;
+
+		dentry = debugfs_create_dir(socinfo_image_names[i],
+					    qcom_socinfo->dbg_root);
+		debugfs_create_file("name", 0400, dentry, &versions[i],
+				    &qcom_image_name_ops);
+		debugfs_create_file("variant", 0400, dentry, &versions[i],
+				    &qcom_image_variant_ops);
+		debugfs_create_file("oem", 0400, dentry, &versions[i],
+				    &qcom_image_oem_ops);
+	}
 }
 
 static void socinfo_debugfs_exit(struct qcom_socinfo *qcom_socinfo)
-- 
2.17.1