Date: Tue, 3 Dec 2019 22:08:54 +0000 (UTC) From: Emmanuel Vadot <manu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r355360 - head/sys/dev/cpufreq Message-ID: <201912032208.xB3M8sZf080528@repo.freebsd.org>
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Author: manu Date: Tue Dec 3 22:08:54 2019 New Revision: 355360 URL: https://svnweb.freebsd.org/changeset/base/355360 Log: cpufreq_dt: Do not attach the device if the cpu isn't present If we boot with hw.ncpu=X (available on arm and arm64 at least) we shouldn't attach the cpufreq driver as cf_set_method will try to get the cpuid and it doesn't exists. This solves cpufreq panicing on RockChip RK3399 when booting with hw.ncpu=4 MFC after: 1 week Modified: head/sys/dev/cpufreq/cpufreq_dt.c Modified: head/sys/dev/cpufreq/cpufreq_dt.c ============================================================================== --- head/sys/dev/cpufreq/cpufreq_dt.c Tue Dec 3 22:01:45 2019 (r355359) +++ head/sys/dev/cpufreq/cpufreq_dt.c Tue Dec 3 22:08:54 2019 (r355360) @@ -446,7 +446,7 @@ cpufreq_dt_attach(device_t dev) struct cpufreq_dt_softc *sc; phandle_t node; phandle_t cnode, opp, copp; - int cpu; + int cpu, ncpu; uint64_t freq; int rv = 0; enum opp_version version; @@ -454,7 +454,15 @@ cpufreq_dt_attach(device_t dev) sc = device_get_softc(dev); sc->dev = dev; node = ofw_bus_get_node(device_get_parent(dev)); + cpu = device_get_unit(device_get_parent(dev)); + if (TUNABLE_INT_FETCH("hw.ncpu", &ncpu)) { + if (cpu >= ncpu) { + device_printf(dev, "Not attaching as cpu is not present\n"); + return (ENXIO); + } + } + if (regulator_get_by_ofw_property(dev, node, "cpu-supply", &sc->reg) != 0) { if (regulator_get_by_ofw_property(dev, node, @@ -496,7 +504,6 @@ cpufreq_dt_attach(device_t dev) * Find all CPUs that share the same opp table */ CPU_ZERO(&sc->cpus); - cpu = device_get_unit(device_get_parent(dev)); for (cnode = node; cnode > 0; cnode = OF_peer(cnode), cpu++) { copp = -1; if (version == OPP_V1)
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