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Commit b0d0a4ba authored by Siddha, Suresh B's avatar Siddha, Suresh B Committed by Andi Kleen
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[PATCH] x86: fix the irqbalance quirk for E7320/E7520/E7525 

Move the irqbalance quirks for E7320/E7520/E7525(Errata 23 in
http://download.intel.com/design/chipsets/specupdt/30304203.pdf

) to early
quirks.

And add a PCI quirk for these platforms to check(which happens very late
during the boot) if the APIC routing is indeed set to default flat mode.

This fixes the breakage(in x86_64) of this quirk due to cpu hotplug which
selects physical mode instead of the logical flat(as needed for this errata
workaround).

Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
parent 9899f826

arch/i386/kernel/acpi/earlyquirk.c

+21 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <asm/pci-direct.h>

#include <asm/acpi.h>

#include <asm/apic.h>

#include <asm/irq.h>



#ifdef CONFIG_ACPI
@@ -49,6 +50,24 @@ static int __init check_bridge(int vendor, int device) 
	return 0;

}



static void check_intel(void)

{

	u16 vendor, device;



	vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);



	if (vendor != PCI_VENDOR_ID_INTEL)

		return;



	device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);

#ifdef CONFIG_SMP

	if (device == PCI_DEVICE_ID_INTEL_E7320_MCH ||

	    device == PCI_DEVICE_ID_INTEL_E7520_MCH ||

	    device == PCI_DEVICE_ID_INTEL_E7525_MCH)

		quirk_intel_irqbalance();

#endif

}



void __init check_acpi_pci(void)

{

	int num, slot, func;
@@ -60,6 +79,8 @@ void __init check_acpi_pci(void) 
	if (!early_pci_allowed())

		return;



	check_intel();



	/* Poor man's PCI discovery */

	for (num = 0; num < 32; num++) {

		for (slot = 0; slot < 32; slot++) {

arch/i386/kernel/quirks.c

+35 −11
Original line number Diff line number Diff line
@@ -3,10 +3,23 @@ 
 */

#include <linux/pci.h>

#include <linux/irq.h>

#include <asm/pci-direct.h>

#include <asm/genapic.h>

#include <asm/cpu.h>



#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)

static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)

{

#ifdef CONFIG_X86_64

	if (genapic !=  &apic_flat)

		panic("APIC mode must be flat on this system\n");

#elif defined(CONFIG_X86_GENERICARCH)

	if (genapic != &apic_default)

		panic("APIC mode must be default(flat) on this system. Use apic=default\n");

#endif

}



static void __devinit quirk_intel_irqbalance(struct pci_dev *dev)

void __init quirk_intel_irqbalance(void)

{

	u8 config, rev;

	u32 word;
@@ -16,18 +29,18 @@ static void __devinit quirk_intel_irqbalance(struct pci_dev *dev) 
	 * based platforms.

	 * Disable SW irqbalance/affinity on those platforms.

	 */

	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);

	rev = read_pci_config_byte(0, 0, 0, PCI_CLASS_REVISION);

	if (rev > 0x9)

		return;



	printk(KERN_INFO "Intel E7520/7320/7525 detected.");



	/* enable access to config space */

	pci_read_config_byte(dev, 0xf4, &config);

	pci_write_config_byte(dev, 0xf4, config|0x2);

	config = read_pci_config_byte(0, 0, 0, 0xf4);

	write_pci_config_byte(0, 0, 0, 0xf4, config|0x2);



	/* read xTPR register */

	raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);

	word = read_pci_config_16(0, 0, 0x40, 0x4c);



	if (!(word & (1 << 13))) {

		printk(KERN_INFO "Disabling irq balancing and affinity\n");
@@ -37,14 +50,25 @@ static void __devinit quirk_intel_irqbalance(struct pci_dev *dev) 
		noirqdebug_setup("");

#ifdef CONFIG_PROC_FS

		no_irq_affinity = 1;

#endif

#ifdef CONFIG_HOTPLUG_CPU

		printk(KERN_INFO "Disabling cpu hotplug control\n");

		enable_cpu_hotplug = 0;

#endif

#ifdef CONFIG_X86_64

		/* force the genapic selection to flat mode so that

		 * interrupts can be redirected to more than one CPU.

		 */

		genapic_force = &apic_flat;

#endif

	}



	/* put back the original value for config space */

	if (!(config & 0x2))

		pci_write_config_byte(dev, 0xf4, config);

		write_pci_config_byte(0, 0, 0, 0xf4, config);

}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7320_MCH,	quirk_intel_irqbalance);

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7525_MCH,	quirk_intel_irqbalance);

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_E7520_MCH,	quirk_intel_irqbalance);

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_E7320_MCH,  verify_quirk_intel_irqbalance);

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_E7525_MCH,  verify_quirk_intel_irqbalance);

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_E7520_MCH,  verify_quirk_intel_irqbalance);



#endif

arch/i386/kernel/smpboot.c

+7 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ 
#include <asm/arch_hooks.h>

#include <asm/nmi.h>

#include <asm/pda.h>

#include <asm/genapic.h>



#include <mach_apic.h>

#include <mach_wakecpu.h>
@@ -1482,6 +1483,12 @@ int __devinit __cpu_up(unsigned int cpu) 
	cpu_set(cpu, smp_commenced_mask);

	while (!cpu_isset(cpu, cpu_online_map))

		cpu_relax();



#ifdef CONFIG_X86_GENERICARCH

	if (num_online_cpus() > 8 && genapic == &apic_default)

		panic("Default flat APIC routing can't be used with > 8 cpus\n");

#endif



	return 0;

}

arch/x86_64/kernel/early-quirks.c

+13 −0
Original line number Diff line number Diff line
@@ -71,6 +71,18 @@ static void ati_bugs(void) 
{

}



static void intel_bugs(void)

{

	u16 device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);



#ifdef CONFIG_SMP

	if (device == PCI_DEVICE_ID_INTEL_E7320_MCH ||

	    device == PCI_DEVICE_ID_INTEL_E7520_MCH ||

	    device == PCI_DEVICE_ID_INTEL_E7525_MCH)

		quirk_intel_irqbalance();

#endif

}



struct chipset {

	u16 vendor;

	void (*f)(void);
@@ -80,6 +92,7 @@ static struct chipset early_qrk[] = { 
	{ PCI_VENDOR_ID_NVIDIA, nvidia_bugs },

	{ PCI_VENDOR_ID_VIA, via_bugs },

	{ PCI_VENDOR_ID_ATI, ati_bugs },

	{ PCI_VENDOR_ID_INTEL, intel_bugs},

	{}

};

arch/x86_64/kernel/smpboot.c

+8 −0
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ 
#include <asm/irq.h>

#include <asm/hw_irq.h>

#include <asm/numa.h>

#include <asm/genapic.h>



/* Number of siblings per CPU package */

int smp_num_siblings = 1;
@@ -1167,6 +1168,13 @@ int __cpuinit __cpu_up(unsigned int cpu) 


	while (!cpu_isset(cpu, cpu_online_map))

		cpu_relax();



	if (num_online_cpus() > 8 && genapic == &apic_flat) {

		printk(KERN_WARNING

		       "flat APIC routing can't be used with > 8 cpus\n");

		BUG();

	}



	err = 0;



	return err;