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-rw-r--r--arch/powerpc/platforms/pseries/kexec.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/kexec.c b/arch/powerpc/platforms/pseries/kexec.c
new file mode 100644
index 000000000..145fcfbc0
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/kexec.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2006 Michael Ellerman, IBM Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+
+#include <asm/machdep.h>
+#include <asm/page.h>
+#include <asm/firmware.h>
+#include <asm/kexec.h>
+#include <asm/xics.h>
+#include <asm/xive.h>
+#include <asm/smp.h>
+#include <asm/plpar_wrappers.h>
+
+#include "pseries.h"
+
+void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
+{
+ /*
+ * Don't risk a hypervisor call if we're crashing
+ * XXX: Why? The hypervisor is not crashing. It might be better
+ * to at least attempt unregister to avoid the hypervisor stepping
+ * on our memory.
+ */
+ if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
+ int ret;
+ int cpu = smp_processor_id();
+ int hwcpu = hard_smp_processor_id();
+
+ if (get_lppaca()->dtl_enable_mask) {
+ ret = unregister_dtl(hwcpu);
+ if (ret) {
+ pr_err("WARNING: DTL deregistration for cpu "
+ "%d (hw %d) failed with %d\n",
+ cpu, hwcpu, ret);
+ }
+ }
+
+ ret = unregister_slb_shadow(hwcpu);
+ if (ret) {
+ pr_err("WARNING: SLB shadow buffer deregistration "
+ "for cpu %d (hw %d) failed with %d\n",
+ cpu, hwcpu, ret);
+ }
+
+ ret = unregister_vpa(hwcpu);
+ if (ret) {
+ pr_err("WARNING: VPA deregistration for cpu %d "
+ "(hw %d) failed with %d\n", cpu, hwcpu, ret);
+ }
+ }
+
+ if (xive_enabled()) {
+ xive_teardown_cpu();
+
+ if (!secondary)
+ xive_shutdown();
+ } else
+ xics_kexec_teardown_cpu(secondary);
+}