include: sbi: Add domains_init() platform operation

We introduce domains_init() platform operation which can be used by
platform support to initialize/populate domains in the coldboot path.

The domains_init() is called late in the coldboot sequence from the
sbi_domain_finalize() so sbi_printf() can be used by platform support
to print errors/warnings at time of populating domains.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

include/sbi/sbi_platform.h

@@ -91,6 +91,8 @@ struct sbi_platform_operations {
 	 */
 	int (*misa_get_xlen)(void);
 
+	/** Initialize (or populate) domains for the platform */
+	int (*domains_init)(void);
 	/** Get domain pointer for given HART id */
 	struct sbi_domain *(*domain_get)(u32 hartid);
 
@@ -451,6 +453,20 @@ static inline int sbi_platform_misa_xlen(const struct sbi_platform *plat)
 	return -1;
 }
 
+/**
+ * Initialize (or populate) domains for the platform
+ *
+ * @param plat pointer to struct sbi_platform
+ *
+ * @return 0 on success and negative error code on failure
+ */
+static inline int sbi_platform_domains_init(const struct sbi_platform *plat)
+{
+	if (plat && sbi_platform_ops(plat)->domains_init)
+		return sbi_platform_ops(plat)->domains_init();
+	return 0;
+}
+
 /**
  * Get domain pointer for given HART
  *

lib/sbi/sbi_domain.c

@@ -375,6 +375,14 @@ int sbi_domain_finalize(struct sbi_scratch *scratch, u32 cold_hartid)
 	struct sbi_domain *dom, *tdom;
 	const struct sbi_platform *plat = sbi_platform_ptr(scratch);
 
+	/* Initialize domains for the platform */
+	rc = sbi_platform_domains_init(plat);
+	if (rc) {
+		sbi_printf("%s: platform domains_init() failed (error %d)\n",
+			   __func__, rc);
+		return rc;
+	}
+
 	/* Discover domains */
 	for (i = 0; i < SBI_HARTMASK_MAX_BITS; i++) {
 		/* Ignore invalid HART */