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45 lines
1.1 KiB
45 lines
1.1 KiB
3 months ago
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diff -up powerpc-utils-1.3.12/src/ppc64_cpu.c.me powerpc-utils-1.3.12/src/ppc64_cpu.c
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--- powerpc-utils-1.3.12/src/ppc64_cpu.c.me 2024-11-14 17:00:06.002985884 +0100
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+++ powerpc-utils-1.3.12/src/ppc64_cpu.c 2024-11-14 17:03:10.401499208 +0100
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@@ -56,6 +56,8 @@
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#define DIAGNOSTICS_RUN_MODE 42
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#define CPU_OFFLINE -1
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+#define SYS_SMT_CONTROL "/sys/devices/system/cpu/smt/control"
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+
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#ifdef HAVE_LINUX_PERF_EVENT_H
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struct cpu_freq {
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int offline;
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@@ -360,6 +362,20 @@ static int is_dscr_capable(void)
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return 0;
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}
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+/*
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+ * Depends on kernel's CONFIG_HOTPLUG_CPU
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+ */
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+static int set_smt_control(int smt_state)
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+{
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+ if (set_attribute(SYS_SMT_CONTROL, "%d", smt_state)) {
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+ /* Silently ignore kernel not supporting this feature */
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+ if (errno != ENODEV)
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+ perror(SYS_SMT_CONTROL);
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+ return -1;
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+ }
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+ return 0;
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+}
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+
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static int do_smt(char *state, bool numeric)
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{
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int rc = 0;
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@@ -388,7 +404,9 @@ static int do_smt(char *state, bool nume
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return -1;
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}
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- rc = set_smt_state(smt_state);
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+ /* Try using smt/control if failing, fall back to the legacy way */
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+ if (set_smt_control(smt_state))
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+ rc = set_smt_state(smt_state);
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}
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return rc;
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