msm: secure_buffer: Add helper function to convert VMIDs into strings

It can be useful to convert secure VMID values into strings.  Provide a
helper function to do so.

Change-Id: If907a0bac92c5d164154c0e5dfe67933115163c8
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

drivers/soc/qcom/secure_buffer.c

@@ -347,6 +347,38 @@ err1:
 	return ret;
 }
 
+const char *msm_secure_vmid_to_string(int secure_vmid)
+{
+	switch (secure_vmid) {
+	case VMID_HLOS:
+		return "VMID_HLOS";
+	case VMID_CP_TOUCH:
+		return "VMID_CP_TOUCH";
+	case VMID_CP_BITSTREAM:
+		return "VMID_CP_BITSTREAM";
+	case VMID_CP_PIXEL:
+		return "VMID_CP_PIXEL";
+	case VMID_CP_NON_PIXEL:
+		return "VMID_CP_NON_PIXEL";
+	case VMID_CP_CAMERA:
+		return "VMID_CP_CAMERA";
+	case VMID_HLOS_FREE:
+		return "VMID_HLOS_FREE";
+	case VMID_MSS_MSA:
+		return "VMID_MSS_MSA";
+	case VMID_MSS_NONMSA:
+		return "VMID_MSS_NONMSA";
+	case VMID_CP_SEC_DISPLAY:
+		return "VMID_CP_SEC_DISPLAY";
+	case VMID_CP_APP:
+		return "VMID_CP_APP";
+	case VMID_INVAL:
+		return "VMID_INVAL";
+	default:
+		return "Unknown VMID";
+	}
+}
+
 #define MAKE_CP_VERSION(major, minor, patch) \
 	(((major & 0x3FF) << 22) | ((minor & 0x3FF) << 12) | (patch & 0xFFF))
 

include/soc/qcom/secure_buffer.h

@@ -27,6 +27,10 @@
 #define VMID_CP_SEC_DISPLAY 0x11
 #define VMID_CP_APP 0x12
 #define VMID_INVAL -1
+/*
+ * if you add a secure VMID here make sure you update
+ * msm_secure_vmid_to_string
+ */
 
 #define PERM_READ                       0x4
 #define PERM_WRITE                      0x2
@@ -43,6 +47,7 @@ int hyp_assign_phys(phys_addr_t addr, u64 size,
 			u32 *source_vmlist, int source_nelems,
 			int *dest_vmids, int *dest_perms, int dest_nelems);
 bool msm_secure_v2_is_supported(void);
+const char *msm_secure_vmid_to_string(int secure_vmid);
 #else
 static inline int msm_secure_table(struct sg_table *table)
 {
@@ -71,5 +76,9 @@ static inline bool msm_secure_v2_is_supported(void)
 {
 	return false;
 }
+const char *msm_secure_vmid_to_string(int secure_vmid)
+{
+	return "N/A";
+}
 #endif
 #endif