SBE: Send OPAL relocated base address to SBE

OPAL relocates itself during boot. During memory preserving IPL hostboot needs
to access relocated OPAL base address 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@linux.vnet.ibm.com>
[oliver: rebased]
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/hw/sbe-p9.c b/hw/sbe-p9.c
index aaf688f..786351a 100644
--- a/hw/sbe-p9.c
+++ b/hw/sbe-p9.c
@@ -851,6 +851,54 @@ 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);
+	struct p9_sbe *sbe = (void *)msg->user_data;
+
+	if (rc == SBE_STATUS_PRI_SUCCESS) {
+		prlog(PR_DEBUG, "Sent stash MPIPL config [chip id =0x%x]\n",
+		      sbe->chip_id);
+	} else {
+		prlog(PR_ERR, "Failed to send stash MPIPL config "
+		      "[chip id = 0x%x, rc = %d]\n", sbe->chip_id, rc);
+	}
+
+	p9_sbe_freemsg(msg);
+}
+
+static void p9_sbe_send_relocated_base_single(struct p9_sbe *sbe, u64 reloc_base)
+{
+	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, reloc_base, 0);
+	if (!msg) {
+		prlog(PR_ERR, "Message allocation failed\n");
+		return;
+	}
+
+	msg->user_data = (void *)sbe;
+	if (p9_sbe_queue_msg(sbe->chip_id, msg, p9_sbe_stash_chipop_resp)) {
+		prlog(PR_ERR, "Failed to queue stash MPIPL config message\n");
+	}
+}
+
+/* Send relocated skiboot base address to all SBE */
+void p9_sbe_send_relocated_base(uint64_t reloc_base)
+{
+	struct proc_chip *chip;
+
+	for_each_chip(chip) {
+		if (chip->sbe == NULL)
+			continue;
+
+		p9_sbe_send_relocated_base_single(chip->sbe, reloc_base);
+	}
+}
+
 void p9_sbe_init(void)
 {
 	struct dt_node *xn;