MPIPL: Prepare OPAL data tag

Post MPIPL kernel needs OPAL metadata to create opalcore. This patch
sets up OPAL metadata tag. Next patch will add API to pass metadata
pointer to kernel.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
[oliver: rebased]
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

core/opal-dump.c

@@ -41,6 +41,10 @@ static struct spira_ntuple *ntuple_mdrt;
 
 static struct mpipl_metadata    *mpipl_metadata;
 
+/* Dump metadata area */
+static struct opal_mpipl_fadump *opal_mpipl_data;
+
+
 static int opal_mpipl_add_entry(u8 region, u64 src, u64 dest, u64 size)
 {
 	int i, max_cnt;
@@ -329,6 +333,60 @@ static int64_t opal_mpipl_register_tag(enum opal_mpipl_tags tag,
 	return rc;
 }
 
+static void post_mpipl_get_opal_data(void)
+{
+	struct mdrt_table *mdrt = (void *)(MDRT_TABLE_BASE);
+	int i, j = 0, count = 0;
+	u32 mdrt_cnt = ntuple_mdrt->act_cnt;
+	struct opal_mpipl_region *region;
+
+	/* Count OPAL dump regions */
+	for (i = 0; i < mdrt_cnt; i++) {
+		if (mdrt->data_region == DUMP_REGION_OPAL_MEMORY)
+			count++;
+		mdrt++;
+	}
+
+	if (count == 0) {
+		prlog(PR_INFO, "OPAL dump is not available\n");
+		return;
+	}
+
+	opal_mpipl_data = zalloc(sizeof(struct opal_mpipl_fadump) +
+				 count * sizeof(struct opal_mpipl_region));
+	if (!opal_mpipl_data) {
+		prlog(PR_ERR, "Failed to allocate memory\n");
+		return;
+	}
+
+	/* Fill OPAL dump details */
+	opal_mpipl_data->version = OPAL_MPIPL_VERSION;
+	opal_mpipl_data->crashing_pir = mpipl_metadata->crashing_pir;
+	opal_mpipl_data->region_cnt = count;
+	region = opal_mpipl_data->region;
+
+	mdrt = (void *)(MDRT_TABLE_BASE);
+	for (i = 0; i < mdrt_cnt; i++) {
+		if (mdrt->data_region != DUMP_REGION_OPAL_MEMORY) {
+			mdrt++;
+			continue;
+		}
+
+		region[j].src  = mdrt->src_addr  & ~(HRMOR_BIT);
+		region[j].dest = mdrt->dest_addr & ~(HRMOR_BIT);
+		region[j].size = mdrt->size;
+
+		prlog(PR_NOTICE, "OPAL reserved region %d - src : 0x%llx, "
+		      "dest : 0x%llx, size : 0x%llx\n", j, region[j].src,
+		      region[j].dest, region[j].size);
+
+		mdrt++;
+		j++;
+		if (j == count)
+			break;
+	}
+}
+
 void opal_mpipl_save_crashing_pir(void)
 {
 	mpipl_metadata->crashing_pir = this_cpu()->pir;
@@ -353,6 +411,9 @@ void opal_mpipl_init(void)
 	/* Get metadata area pointer */
 	mpipl_metadata = (void *)(DUMP_METADATA_AREA_BASE);
 
+	if (dt_find_property(dump_node, "mpipl-boot"))
+		post_mpipl_get_opal_data();
+
 	/* Clear OPAL metadata area */
 	if (sizeof(struct mpipl_metadata) > DUMP_METADATA_AREA_SIZE) {
 		prlog(PR_ERR, "INSUFFICIENT OPAL METADATA AREA\n");

include/opal-api.h

@@ -1223,6 +1223,26 @@ enum opal_mpipl_tags {
 	OPAL_MPIPL_TAG_BOOT_MEM	= 3,
 };
 
+/* Preserved memory details */
+struct opal_mpipl_region {
+	u64	src;
+	u64	dest;
+	u64	size;
+};
+
+/* Structure version */
+#define OPAL_MPIPL_VERSION		0x01
+
+struct opal_mpipl_fadump {
+	u8	version;
+	u8	reserved[7];
+	u32	crashing_pir;	/* OPAL crashing CPU PIR */
+	u32	cpu_data_version;
+	u32	cpu_data_size;
+	u32	region_cnt;
+	struct	opal_mpipl_region region[];
+} __packed;
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __OPAL_API_H */