Date: Wed, 20 Sep 2023 16:07:21 GMT From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: c643e82dba0b - main - arm64: Fix errata workarounds that depend on smccc Message-ID: <202309201607.38KG7LX1052763@gitrepo.freebsd.org>
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The branch main has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=c643e82dba0b17b2716de4c9d44a3c9c547cbbd5 commit c643e82dba0b17b2716de4c9d44a3c9c547cbbd5 Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2023-09-18 16:34:51 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2023-09-20 16:01:10 +0000 arm64: Fix errata workarounds that depend on smccc Some arm64 errata depend on calling into the firmware via the SMCCC interface. This needs to happen after the psci driver has attached as they share the interface. Fix this by allowing the workarounds to mark when they depend on device drivers attaching. This is only an issue on CPU 0 as the workarounds are applied later for the non-boot CPUs. Reviewed by: emaste Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D41916 --- sys/arm64/arm64/cpu_errata.c | 46 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 43 insertions(+), 3 deletions(-) diff --git a/sys/arm64/arm64/cpu_errata.c b/sys/arm64/arm64/cpu_errata.c index 38148ff7066c..6c294ff1237c 100644 --- a/sys/arm64/arm64/cpu_errata.c +++ b/sys/arm64/arm64/cpu_errata.c @@ -47,6 +47,9 @@ struct cpu_quirks { cpu_quirk_install *quirk_install; u_int midr_mask; u_int midr_value; +#define CPU_QUIRK_POST_DEVICE (1 << 0) /* After device attach */ + /* e.g. needs SMCCC */ + u_int flags; }; static enum { @@ -85,11 +88,13 @@ static struct cpu_quirks cpu_quirks[] = { .midr_value = CPU_ID_RAW(CPU_IMPL_CAVIUM, CPU_PART_THUNDERX2, 0,0), .quirk_install = install_psci_bp_hardening, + .flags = CPU_QUIRK_POST_DEVICE, }, { .midr_mask = 0, .midr_value = 0, .quirk_install = install_ssbd_workaround, + .flags = CPU_QUIRK_POST_DEVICE, }, { .midr_mask = CPU_IMPL_MASK | CPU_PART_MASK, @@ -173,8 +178,8 @@ install_thunderx_bcast_tlbi_workaround(void) } } -void -install_cpu_errata(void) +static void +install_cpu_errata_flags(u_int mask, u_int flags) { u_int midr; size_t i; @@ -183,8 +188,43 @@ install_cpu_errata(void) for (i = 0; i < nitems(cpu_quirks); i++) { if ((midr & cpu_quirks[i].midr_mask) == - cpu_quirks[i].midr_value) { + cpu_quirks[i].midr_value && + (cpu_quirks[i].flags & mask) == flags) { cpu_quirks[i].quirk_install(); } } } + +/* + * Install any CPU errata we need. On CPU 0 we only install the errata that + * don't depend on device drivers as this is called early in the boot process. + * On other CPUs the device drivers have already attached so install all + * applicable errata. + */ +void +install_cpu_errata(void) +{ + /* + * Only install early CPU errata on CPU 0, device drivers may not + * have attached and some workarounds depend on them, e.g. to query + * SMCCC. + */ + if (PCPU_GET(cpuid) == 0) { + install_cpu_errata_flags(CPU_QUIRK_POST_DEVICE, 0); + } else { + install_cpu_errata_flags(0, 0); + } +} + +/* + * Install any errata workarounds that depend on device drivers, e.g. use + * SMCCC to install a workaround. + */ +static void +install_cpu_errata_late(void *dummy __unused) +{ + MPASS(PCPU_GET(cpuid) == 0); + install_cpu_errata_flags(CPU_QUIRK_POST_DEVICE, CPU_QUIRK_POST_DEVICE); +} +SYSINIT(install_cpu_errata_late, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, + install_cpu_errata_late, NULL);
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