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Subject[PATCH] x86,apic: Blacklist x2APIC on some platforms
Date
Blacklist x2apic when Nivida graphics enabled on Lenovo ThinkPad T420.
Also set blacklist x2apic for Lenovo ThinkPad W520 and L520.


Thre are 3 bug reports:
https://bugzilla.kernel.org/show_bug.cgi?id=43054
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999
https://bugs.launchpad.net/bugs/922037

The patches is based on http://git.kernel.org/?p=linux/kernel/git/yinghai/
linux-yinghai.git;a=patch;h=de38757e964cfee20e6da1977572a2191d7f4aa0

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Youquan Song <youquan.song@intel.com>
---
arch/x86/include/asm/x86_init.h | 1 +
arch/x86/kernel/apic/apic.c | 51 +++++++++++++++++++++++++++++++++++++++
arch/x86/kernel/early-quirks.c | 9 +++++++
3 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 38155f6..88e39e6 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -202,5 +202,6 @@ extern struct x86_msi_ops x86_msi;
extern struct x86_io_apic_ops x86_io_apic_ops;
extern void x86_init_noop(void);
extern void x86_init_uint_noop(unsigned int unused);
+extern int early_found_nvidia_display_card;

#endif
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 24deb30..0822fe9 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -170,6 +170,54 @@ static __init int setup_nox2apic(char *str)
return 0;
}
early_param("nox2apic", setup_nox2apic);
+
+static __init int x2apic_set_blacklist_nvidia(const struct dmi_system_id *d)
+{
+ if (!early_found_nvidia_display_card)
+ return 1;
+
+ setup_nox2apic("");
+ pr_info("x2apic blacklisted when Nivida graphics enabled on %s\n",
+ d->ident);
+ return 0;
+}
+
+static __init int x2apic_set_blacklist(const struct dmi_system_id *d)
+{
+ setup_nox2apic("");
+ pr_info("x2apic blacklisted because of broken SMI on %s\n",
+ d->ident);
+ return 0;
+}
+
+static const struct dmi_system_id x2apic_dmi_table[] = {
+ {
+ .callback = x2apic_set_blacklist_nvidia,
+ .ident = "Lenovo ThinkPad T420",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
+ },
+ },
+ {
+ .callback = x2apic_set_blacklist,
+ .ident = "Lenovo ThinkPad W520",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W520"),
+ },
+ },
+ {
+ .callback = x2apic_set_blacklist,
+ .ident = "Lenovo ThinkPad L520",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L520"),
+ },
+ },
+ {}
+};
+
#endif

unsigned long mp_lapic_addr;
@@ -1542,6 +1590,9 @@ void __init enable_IR_x2apic(void)
int ret, x2apic_enabled = 0;
int hardware_init_ret;

+ if (x2apic_supported())
+ dmi_check_system(x2apic_dmi_table);
+
/* Make sure irq_remap_ops are initialized */
setup_irq_remapping_ops();

diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index 7548932..852d7a0 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -19,6 +19,8 @@
#include <asm/iommu.h>
#include <asm/gart.h>

+int early_found_nvidia_display_card __initdata;
+
static void __init fix_hypertransport_config(int num, int slot, int func)
{
u32 htcfg;
@@ -192,6 +194,11 @@ static void __init ati_bugs_contd(int num, int slot, int func)
}
#endif

+static void __init nvidia_x2apic_bugs(int num, int slot, int func)
+{
+ early_found_nvidia_display_card = 1;
+}
+
#define QFLAG_APPLY_ONCE 0x1
#define QFLAG_APPLIED 0x2
#define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
@@ -221,6 +228,8 @@ static struct chipset early_qrk[] __initdata = {
PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
+ { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
+ PCI_CLASS_DISPLAY_VGA, 0xff00, 0, nvidia_x2apic_bugs},
{}
};

--
1.7.1


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