git: b9b148609abd - stable/13 - arm64: Check if PSCI before calling SMCCC

The branch stable/13 has been updated by andrew:

URL: https://cgit.FreeBSD.org/src/commit/?id=b9b148609abde98b6cf4470f0486ec65137c7282

commit b9b148609abde98b6cf4470f0486ec65137c7282
Author:     Andrew Turner <andrew@FreeBSD.org>
AuthorDate: 2023-10-30 14:33:08 +0000
Commit:     Andrew Turner <andrew@FreeBSD.org>
CommitDate: 2024-02-19 12:44:19 +0000

    arm64: Check if PSCI before calling SMCCC
    
    As SMCCC depends on PSCI check if the latter is present before calling
    the former. This fixes an issue where we may call into SMCCC when there
    is no PSCI in the system causing a smccc_version assert to fail.
    
    Reported by:    stevek
    Reviewed by:    emaste, imp, stevek
    Sponsored by:   Arm Ltd
    Differential Revision:  https://reviews.freebsd.org/D42404
    
    (cherry picked from commit 5a8417c78f9d51bf1103353bee348eaac83e86e5)
---
 sys/arm64/arm64/cpu_errata.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sys/arm64/arm64/cpu_errata.c b/sys/arm64/arm64/cpu_errata.c
index fee22240bb0e..a03303d83044 100644
--- a/sys/arm64/arm64/cpu_errata.c
+++ b/sys/arm64/arm64/cpu_errata.c
@@ -40,6 +40,7 @@
 
 #include <machine/cpu.h>
 
+#include <dev/psci/psci.h>
 #include <dev/psci/smccc.h>
 
 typedef void (cpu_quirk_install)(void);
@@ -117,6 +118,9 @@ static struct cpu_quirks cpu_quirks[] = {
 static void
 install_psci_bp_hardening(void)
 {
+	/* SMCCC depends on PSCI. If PSCI is missing so is SMCCC */
+	if (!psci_present)
+		return;
 
 	if (smccc_arch_features(SMCCC_ARCH_WORKAROUND_1) != SMCCC_RET_SUCCESS)
 		return;
@@ -140,6 +144,10 @@ install_ssbd_workaround(void)
 		}
 	}
 
+	/* SMCCC depends on PSCI. If PSCI is missing so is SMCCC */
+	if (!psci_present)
+		return;
+
 	/* Enable the workaround on this CPU if it's enabled in the firmware */
 	if (smccc_arch_features(SMCCC_ARCH_WORKAROUND_2) != SMCCC_RET_SUCCESS)
 		return;