powerpc/fadump: handle invalidation of crashdump and re-registraion

Make OPAL call to indicate that the dump is processed and the metadata
area in OPAL can be cleared/released. Also, setup/initialize FADump
for re-registration.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821356046.5656.12270927048195494911.stgit@hbathini.in.ibm.com

arch/powerpc/kernel/fadump.c

@@ -1063,7 +1063,13 @@ static void fadump_invalidate_release_mem(void)
 	fadump_release_memory(fw_dump.boot_memory_size, memblock_end_of_DRAM());
 	fadump_free_cpu_notes_buf();
 
-	/* Initialize the kernel dump memory structure for FAD registration. */
+	/*
+	 * Setup kernel metadata and initialize the kernel dump
+	 * memory structure for FADump re-registration.
+	 */
+	if (fw_dump.ops->fadump_setup_metadata &&
+	    (fw_dump.ops->fadump_setup_metadata(&fw_dump) < 0))
+		pr_warn("Failed to setup kernel metadata!\n");
 	fw_dump.ops->fadump_init_mem_struct(&fw_dump);
 }
 

arch/powerpc/platforms/powernv/opal-fadump.c

@@ -254,7 +254,17 @@ static int opal_fadump_unregister(struct fw_dump *fadump_conf)
 
 static int opal_fadump_invalidate(struct fw_dump *fadump_conf)
 {
-	return -EIO;
+	s64 rc;
+
+	rc = opal_mpipl_update(OPAL_MPIPL_FREE_PRESERVED_MEMORY, 0, 0, 0);
+	if (rc) {
+		pr_err("Failed to invalidate - unexpected Error(%lld).\n", rc);
+		return -EIO;
+	}
+
+	fadump_conf->dump_active = 0;
+	opal_fdm_active = NULL;
+	return 0;
 }
 
 static void opal_fadump_cleanup(struct fw_dump *fadump_conf)