[Skiboot] [PATCH v3 15/18] fadump: Send OPAL relocated base address to SBE

[Vasant Hegde]

OPAL relocates itself during boot. During memory preserving IPL hostboot needs
to access relocated OPAL to get MDST, MDDT tables. Hence send relocated base
address to SBE via 'stash MPIPL config' chip-op. During next IPL SBE will send
stashed data to hostboot... so that hostboot can access these data.

Signed-off-by: Vasant Hegde <hegdevasant at linux.vnet.ibm.com>
---
 core/opal-mpipl.c |  4 ++++
 hw/sbe-p9.c       | 31 +++++++++++++++++++++++++++++++
 include/sbe-p9.h  |  6 ++++++
 3 files changed, 41 insertions(+)

diff --git a/core/opal-mpipl.c b/core/opal-mpipl.c
index 4eda1a7c5..b36f9bb1d 100644
--- a/core/opal-mpipl.c
+++ b/core/opal-mpipl.c
@@ -23,6 +23,7 @@
 #include <opal.h>
 #include <opal-dump.h>
 #include <opal-internal.h>
+#include <sbe-p9.h>
 #include <skiboot.h>
 
 #include <ccan/endian/endian.h>
@@ -348,6 +349,9 @@ void opal_fadump_init(void)
 
 	adjust_opal_dump_size(dump_node);
 
+	/* Send OPAL relocated base address to SBE */
+	p9_sbe_send_relocated_base(SKIBOOT_BASE);
+
 	/* OPAL interface */
 	opal_register(OPAL_FADUMP_MANAGE, opal_fadump_manage, 3);
 }
diff --git a/hw/sbe-p9.c b/hw/sbe-p9.c
index d52ada15a..12d9e97ff 100644
--- a/hw/sbe-p9.c
+++ b/hw/sbe-p9.c
@@ -861,6 +861,37 @@ bool p9_sbe_timer_ok(void)
 	return sbe_has_timer;
 }
 
+static void p9_sbe_stash_chipop_resp(struct p9_sbe_msg *msg)
+{
+	int rc = p9_sbe_get_primary_rc(msg->resp);
+
+	if (rc == SBE_STATUS_PRI_SUCCESS) {
+		prlog(PR_DEBUG, "Sent stash MPIPL config\n");
+	} else {
+		prlog(PR_DEBUG,
+		      "Failed to send stash MPIPL config [rc = 0x%x]\n", rc);
+	}
+
+	p9_sbe_freemsg(msg);
+}
+
+void p9_sbe_send_relocated_base(uint64_t val)
+{
+	u8 key = SBE_STASH_KEY_SKIBOOT_BASE;
+	u16 cmd = SBE_CMD_STASH_MPIPL_CONFIG;
+	u16 flag = SBE_CMD_CTRL_RESP_REQ;
+	struct p9_sbe_msg *msg;
+
+	msg = p9_sbe_mkmsg(cmd, flag, key, val, 0);
+	if (!msg) {
+		prlog(PR_DEBUG, "Message allocation failed\n");
+		return;
+	}
+	if (p9_sbe_queue_msg(sbe_default_chip_id, msg, p9_sbe_stash_chipop_resp)) {
+		prlog(PR_ERR, "Failed to queue stash MPIPL config message\n");
+	}
+}
+
 void p9_sbe_init(void)
 {
 	struct dt_node *xn;
diff --git a/include/sbe-p9.h b/include/sbe-p9.h
index 4b839d8ba..7101dc700 100644
--- a/include/sbe-p9.h
+++ b/include/sbe-p9.h
@@ -159,6 +159,9 @@
 #define CONTROL_TIMER_START		0x0001
 #define CONTROL_TIMER_STOP		0x0002
 
+/* Stash MPIPL config */
+#define SBE_STASH_KEY_SKIBOOT_BASE	0x03
+
 /* SBE message state */
 enum p9_sbe_msg_state {
 	sbe_msg_unused = 0,	/* Free */
@@ -237,4 +240,7 @@ extern bool p9_sbe_timer_ok(void);
 /* Update SBE timer expiry */
 extern void p9_sbe_update_timer_expiry(uint64_t new_target);
 
+/* Send skiboot relocated base address to SBE */
+extern void p9_sbe_send_relocated_base(uint64_t val);
+
 #endif	/* __SBE_P9_H */
-- 
2.14.3