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[PATCH 4.9 079/116] x86/smpboot: Make logical package management more robust

From Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups linux.kernel
Subject [PATCH 4.9 079/116] x86/smpboot: Make logical package management more robust
Date 2017-01-06 23:30 +0100
Message-ID <sWLbl-8oT-29@gated-at.bofh.it> (permalink)
References <sWKIh-7VJ-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@linutronix.de>

commit 9d85eb9119f4eeeb48e87adfcd71f752655700e9 upstream.

The logical package management has several issues:

 - The APIC ids provided by ACPI are not required to be the same as the
   initial APIC id which can be retrieved by CPUID. The APIC ids provided
   by ACPI are those which are written by the BIOS into the APIC. The
   initial id is set by hardware and can not be changed. The hardware
   provided ids contain the real hardware package information.

   Especially AMD sets the effective APIC id different from the hardware id
   as they need to reserve space for the IOAPIC ids starting at id 0.

   As a consequence those machines trigger the currently active firmware
   bug printouts in dmesg, These are obviously wrong.

 - Virtual machines have their own interesting of enumerating APICs and
   packages which are not reliably covered by the current implementation.

The sizing of the mapping array has been tweaked to be generously large to
handle systems which provide a wrong core count when HT is disabled so the
whole magic which checks for space in the physical hotplug case is not
needed anymore.

Simplify the whole machinery and do the mapping when the CPU starts and the
CPUID derived physical package information is available. This solves the
observed problems on AMD machines and works for the virtualization issues
as well.

Remove the extra call from XEN cpu bringup code as it is not longer
required.

Fixes: d49597fd3bc7 ("x86/cpu: Deal with broken firmware (VMWare/XEN)")
Reported-and-tested-by: Borislav Petkov <bp@suse.de>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: M. Vefa Bicakci <m.v.b@runbox.com>
Cc: xen-devel <xen-devel@lists.xen.org>
Cc: Charles (Chas) Williams <ciwillia@brocade.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Alok Kataria <akataria@vmware.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1612121102260.3429@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/apic/apic.c  |   15 ------------
 arch/x86/kernel/cpu/common.c |   24 ++++++--------------
 arch/x86/kernel/smpboot.c    |   51 ++++++++++++++++---------------------------
 arch/x86/xen/smp.c           |    6 -----
 4 files changed, 27 insertions(+), 69 deletions(-)

--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2159,21 +2159,6 @@ int __generic_processor_info(int apicid,
 	}
 
 	/*
-	 * This can happen on physical hotplug. The sanity check at boot time
-	 * is done from native_smp_prepare_cpus() after num_possible_cpus() is
-	 * established.
-	 */
-	if (topology_update_package_map(apicid, cpu) < 0) {
-		int thiscpu = max + disabled_cpus;
-
-		pr_warning("APIC: Package limit reached. Processor %d/0x%x ignored.\n",
-			   thiscpu, apicid);
-
-		disabled_cpus++;
-		return -ENOSPC;
-	}
-
-	/*
 	 * Validate version
 	 */
 	if (version == 0x0) {
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -979,29 +979,21 @@ static void x86_init_cache_qos(struct cp
 }
 
 /*
- * The physical to logical package id mapping is initialized from the
- * acpi/mptables information. Make sure that CPUID actually agrees with
- * that.
+ * Validate that ACPI/mptables have the same information about the
+ * effective APIC id and update the package map.
  */
-static void sanitize_package_id(struct cpuinfo_x86 *c)
+static void validate_apic_and_package_id(struct cpuinfo_x86 *c)
 {
 #ifdef CONFIG_SMP
-	unsigned int pkg, apicid, cpu = smp_processor_id();
+	unsigned int apicid, cpu = smp_processor_id();
 
 	apicid = apic->cpu_present_to_apicid(cpu);
-	pkg = apicid >> boot_cpu_data.x86_coreid_bits;
 
-	if (apicid != c->initial_apicid) {
-		pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x CPUID: %x\n",
+	if (apicid != c->apicid) {
+		pr_err(FW_BUG "CPU%u: APIC id mismatch. Firmware: %x APIC: %x\n",
 		       cpu, apicid, c->initial_apicid);
-		c->initial_apicid = apicid;
 	}
-	if (pkg != c->phys_proc_id) {
-		pr_err(FW_BUG "CPU%u: Using firmware package id %u instead of %u\n",
-		       cpu, pkg, c->phys_proc_id);
-		c->phys_proc_id = pkg;
-	}
-	c->logical_proc_id = topology_phys_to_logical_pkg(pkg);
+	BUG_ON(topology_update_package_map(c->phys_proc_id, cpu));
 #else
 	c->logical_proc_id = 0;
 #endif
@@ -1132,7 +1124,6 @@ static void identify_cpu(struct cpuinfo_
 #ifdef CONFIG_NUMA
 	numa_add_cpu(smp_processor_id());
 #endif
-	sanitize_package_id(c);
 }
 
 /*
@@ -1188,6 +1179,7 @@ void identify_secondary_cpu(struct cpuin
 	enable_sep_cpu();
 #endif
 	mtrr_ap_init();
+	validate_apic_and_package_id(c);
 }
 
 struct msr_range {
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -104,7 +104,6 @@ static unsigned int max_physical_pkg_id
 unsigned int __max_logical_packages __read_mostly;
 EXPORT_SYMBOL(__max_logical_packages);
 static unsigned int logical_packages __read_mostly;
-static bool logical_packages_frozen __read_mostly;
 
 /* Maximum number of SMT threads on any online core */
 int __max_smt_threads __read_mostly;
@@ -263,9 +262,14 @@ static void notrace start_secondary(void
 	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 }
 
-int topology_update_package_map(unsigned int apicid, unsigned int cpu)
+/**
+ * topology_update_package_map - Update the physical to logical package map
+ * @pkg:	The physical package id as retrieved via CPUID
+ * @cpu:	The cpu for which this is updated
+ */
+int topology_update_package_map(unsigned int pkg, unsigned int cpu)
 {
-	unsigned int new, pkg = apicid >> boot_cpu_data.x86_coreid_bits;
+	unsigned int new;
 
 	/* Called from early boot ? */
 	if (!physical_package_map)
@@ -278,16 +282,17 @@ int topology_update_package_map(unsigned
 	if (test_and_set_bit(pkg, physical_package_map))
 		goto found;
 
-	if (logical_packages_frozen) {
-		physical_to_logical_pkg[pkg] = -1;
-		pr_warn("APIC(%x) Package %u exceeds logical package max\n",
-			apicid, pkg);
+	if (logical_packages >= __max_logical_packages) {
+		pr_warn("Package %u of CPU %u exceeds BIOS package data %u.\n",
+			logical_packages, cpu, __max_logical_packages);
 		return -ENOSPC;
 	}
 
 	new = logical_packages++;
-	pr_info("APIC(%x) Converting physical %u to logical package %u\n",
-		apicid, pkg, new);
+	if (new != pkg) {
+		pr_info("CPU %u Converting physical %u to logical package %u\n",
+			cpu, pkg, new);
+	}
 	physical_to_logical_pkg[pkg] = new;
 
 found:
@@ -308,9 +313,9 @@ int topology_phys_to_logical_pkg(unsigne
 }
 EXPORT_SYMBOL(topology_phys_to_logical_pkg);
 
-static void __init smp_init_package_map(void)
+static void __init smp_init_package_map(struct cpuinfo_x86 *c, unsigned int cpu)
 {
-	unsigned int ncpus, cpu;
+	unsigned int ncpus;
 	size_t size;
 
 	/*
@@ -355,27 +360,9 @@ static void __init smp_init_package_map(
 	size = BITS_TO_LONGS(max_physical_pkg_id) * sizeof(unsigned long);
 	physical_package_map = kzalloc(size, GFP_KERNEL);
 
-	for_each_present_cpu(cpu) {
-		unsigned int apicid = apic->cpu_present_to_apicid(cpu);
-
-		if (apicid == BAD_APICID || !apic->apic_id_valid(apicid))
-			continue;
-		if (!topology_update_package_map(apicid, cpu))
-			continue;
-		pr_warn("CPU %u APICId %x disabled\n", cpu, apicid);
-		per_cpu(x86_bios_cpu_apicid, cpu) = BAD_APICID;
-		set_cpu_possible(cpu, false);
-		set_cpu_present(cpu, false);
-	}
-
-	if (logical_packages > __max_logical_packages) {
-		pr_warn("Detected more packages (%u), then computed by BIOS data (%u).\n",
-			logical_packages, __max_logical_packages);
-		logical_packages_frozen = true;
-		__max_logical_packages  = logical_packages;
-	}
-
 	pr_info("Max logical packages: %u\n", __max_logical_packages);
+
+	topology_update_package_map(c->phys_proc_id, cpu);
 }
 
 void __init smp_store_boot_cpu_info(void)
@@ -385,7 +372,7 @@ void __init smp_store_boot_cpu_info(void
 
 	*c = boot_cpu_data;
 	c->cpu_index = id;
-	smp_init_package_map();
+	smp_init_package_map(c, id);
 }
 
 /*
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -87,12 +87,6 @@ static void cpu_bringup(void)
 	cpu_data(cpu).x86_max_cores = 1;
 	set_cpu_sibling_map(cpu);
 
-	/*
-	 * identify_cpu() may have set logical_pkg_id to -1 due
-	 * to incorrect phys_proc_id. Let's re-comupte it.
-	 */
-	topology_update_package_map(apic->cpu_present_to_apicid(cpu), cpu);
-
 	xen_setup_cpu_clockevents();
 
 	notify_cpu_starting(cpu);

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  [PATCH 4.9 079/116] x86/smpboot: Make logical package management more robust Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:30 +0100
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  [PATCH 4.9 064/116] firmware: fix usermode helper fallback loading Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
  [PATCH 4.9 009/116] ath9k: fix ath9k_hw_gpio_get() to return 0 or 1 on success Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
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  [PATCH 4.9 058/116] iscsi-target: Return error if unable to add network portal Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
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  [PATCH 4.9 061/116] scsi: zfcp: fix rport unblock race with LUN recovery Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
  [PATCH 4.9 046/116] drm/gma500: Add compat ioctl Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
  [PATCH 4.9 056/116] scsi: megaraid_sas: For SRIOV enabled firmware, ensure VF driver waits for 30secs before reset Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
  [PATCH 4.9 008/116] cfg80211/mac80211: fix BSS leaks when abandoning assoc attempts Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
  [PATCH 4.9 005/116] perf annotate: Dont throw error for zero length symbols Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-06 23:50 +0100
  [PATCH 4.9 026/116] staging: comedi: ni_mio_common: fix M Series ni_ai_insn_read() data mask Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 011/116] ath9k: do not return early to fix rcu unlocking Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 019/116] arm64: tegra: Add VDD_GPU regulator to Jetson TX1 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 012/116] Revert "mmc: sdhci: Reset cmd and data circuits after tuning failure" Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 030/116] drm/amdgpu/si: load the proper firmware on 0x87 oland boards Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 025/116] staging: lustre: ldlm: pl_recalc time handling is wrong Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 023/116] hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 024/116] staging/lustre/osc: Revert erroneous list_for_each_entry_safe use Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
  [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 00:00 +0100
    Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Dmitry Osipenko <digetx@gmail.com> - 2017-01-10 18:50 +0100
      Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-10 21:50 +0100
        Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save lkml@pengaru.com - 2017-01-10 22:30 +0100
          Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Willy Tarreau <w@1wt.eu> - 2017-01-10 23:00 +0100
            Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-12 08:40 +0100
              Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Dmitry Osipenko <digetx@gmail.com> - 2017-01-12 09:50 +0100
              Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Kalle Valo <kvalo@codeaurora.org> - 2017-01-13 07:50 +0100
                Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-13 12:00 +0100
        Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Larry Finger <Larry.Finger@lwfinger.net> - 2017-01-11 03:00 +0100
      Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Larry Finger <Larry.Finger@lwfinger.net> - 2017-01-11 03:00 +0100
        Re: [PATCH 4.9 003/116] rtlwifi: Fix enter/exit power_save Dmitry Osipenko <digetx@gmail.com> - 2017-01-12 09:50 +0100
  Re: [PATCH 4.9 000/116] 4.9.2-stable review Shuah Khan <shuah.kh@samsung.com> - 2017-01-07 03:10 +0100
    Re: [PATCH 4.9 000/116] 4.9.2-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 14:20 +0100
  Re: [PATCH 4.9 000/116] 4.9.2-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 14:30 +0100
    Re: [PATCH 4.9 000/116] 4.9.2-stable review Kevin Hilman <khilman@baylibre.com> - 2017-01-09 19:20 +0100
      Re: [PATCH 4.9 000/116] 4.9.2-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-10 11:20 +0100
  Re: [PATCH 4.9 000/116] 4.9.2-stable review Guenter Roeck <linux@roeck-us.net> - 2017-01-07 17:10 +0100
    Re: [PATCH 4.9 000/116] 4.9.2-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-01-07 17:20 +0100

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