The patch titled
i386: Fix the verify_quirk_intel_irqbalance()
has been added to the -mm tree. Its filename is
i386-fix-the-verify_quirk_intel_irqbalance.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: Fix the verify_quirk_intel_irqbalance()
From: "Siddha, Suresh B" <suresh.b.siddha@xxxxxxxxx>
Fix the verify_quirk_intel_irqbalance(). genapic checks should really
happen only on affected versions of the E7520/E7320/E7525 based platforms.
Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/quirks.c | 33 +++++++++++++++++++++++++++++----
1 file changed, 29 insertions(+), 4 deletions(-)
diff -puN arch/i386/kernel/quirks.c~i386-fix-the-verify_quirk_intel_irqbalance arch/i386/kernel/quirks.c
--- a/arch/i386/kernel/quirks.c~i386-fix-the-verify_quirk_intel_irqbalance
+++ a/arch/i386/kernel/quirks.c
@@ -10,13 +10,38 @@
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)
{
+ u8 config, rev;
+ u32 word;
+
+ /* BIOS may enable hardware IRQ balancing for
+ * E7520/E7320/E7525(revision ID 0x9 and below)
+ * based platforms.
+ * For those platforms, make sure that the genapic is set to 'flat'
+ */
+ pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
+ if (rev > 0x9)
+ return;
+
+ /* enable access to config space*/
+ pci_read_config_byte(dev, 0xf4, &config);
+ pci_write_config_byte(dev, 0xf4, config|0x2);
+
+ /* read xTPR register */
+ raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
+
+ if (!(word & (1 << 13))) {
#ifdef CONFIG_X86_64
- if (genapic != &apic_flat)
- panic("APIC mode must be flat on this system\n");
+ 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");
+ if (genapic != &apic_default)
+ panic("APIC mode must be default(flat) on this system. Use apic=default\n");
#endif
+ }
+
+ /* put back the original value for config space*/
+ if (!(config & 0x2))
+ pci_write_config_byte(dev, 0xf4, config);
}
void __init quirk_intel_irqbalance(void)
_
Patches currently in -mm which might be from suresh.b.siddha@xxxxxxxxx are
origin.patch
i386-fix-the-verify_quirk_intel_irqbalance.patch
revert-x86_64-mm-add-genapic_force.patch
revert-x86_64-mm-fix-the-irqbalance-quirk-for-e7320-e7520-e7525.patch
genapic-optimize-fix-apic-mode-setup-2.patch
genapic-always-use-physical-delivery-mode-on-8-cpus.patch
genapic-remove-es7000-workaround.patch
genapic-remove-clustered-apic-mode.patch
genapic-default-to-physical-mode-on-hotplug-cpu-kernels.patch
sched-domain-move-sched-group-allocations-to-percpu-area.patch
sched-domain-increase-the-smt-busy-rebalance-interval.patch
sched-avoid-taking-rq-lock-in-wake_priority_sleeper.patch
sched-remove-staggering-of-load-balancing.patch
sched-disable-interrupts-for-locking-in-load_balance.patch
sched-extract-load-calculation-from-rebalance_tick.patch
sched-move-idle-status-calculation-into-rebalance_tick.patch
sched-use-softirq-for-load-balancing.patch
sched-call-tasklet-less-frequently.patch
sched-add-option-to-serialize-load-balancing.patch
sched-add-option-to-serialize-load-balancing-fix.patch
sched-decrease-number-of-load-balances.patch
sched-remove-lb_stopbalance-counter.patch
sched-optimize-activate_task-for-rt-task.patch
mm-only-sched-add-a-few-scheduler-event-counters.patch
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