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Date: Sun, 6 Dec 2009 11:01:40 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
cc: Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: [GIT pull] timers hpet updates for 2.6.33
Linus,
Please pull the latest timers-for-linus-hpet git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git timers-for-linus-hpet
Thanks,
tglx
------------------>
Jan Beulich (1):
x86, hpet: Simplify the HPET code
Shaohua Li (1):
x86, hpet: Disable per-cpu hpet timer if ARAT is supported
Suresh Siddha (2):
intr-remap: generic support for remapping HPET MSIs
x86: arch specific support for remapping HPET MSIs
Thomas Gleixner (1):
x86: hpet: Make WARN_ON understandable
arch/x86/include/asm/hpet.h | 7 ++-
arch/x86/kernel/acpi/boot.c | 1 +
arch/x86/kernel/apic/io_apic.c | 49 ++++++++++++++++++----
arch/x86/kernel/hpet.c | 77 ++++++++++++++++++++++------------
drivers/pci/intr_remapping.c | 89 ++++++++++++++++++++++++++++++++++++++--
drivers/pci/intr_remapping.h | 7 +++
include/linux/dmar.h | 10 ++++
include/linux/hpet.h | 2 +
8 files changed, 199 insertions(+), 43 deletions(-)
diff --git a/arch/x86/include/asm/hpet.h b/arch/x86/include/asm/hpet.h
index 1c22cb0..5d89fd2 100644
--- a/arch/x86/include/asm/hpet.h
+++ b/arch/x86/include/asm/hpet.h
@@ -65,11 +65,12 @@
/* hpet memory map physical address */
extern unsigned long hpet_address;
extern unsigned long force_hpet_address;
+extern u8 hpet_blockid;
extern int hpet_force_user;
extern int is_hpet_enabled(void);
extern int hpet_enable(void);
extern void hpet_disable(void);
-extern unsigned long hpet_readl(unsigned long a);
+extern unsigned int hpet_readl(unsigned int a);
extern void force_hpet_resume(void);
extern void hpet_msi_unmask(unsigned int irq);
@@ -78,9 +79,9 @@ extern void hpet_msi_write(unsigned int irq, struct msi_msg *msg);
extern void hpet_msi_read(unsigned int irq, struct msi_msg *msg);
#ifdef CONFIG_PCI_MSI
-extern int arch_setup_hpet_msi(unsigned int irq);
+extern int arch_setup_hpet_msi(unsigned int irq, unsigned int id);
#else
-static inline int arch_setup_hpet_msi(unsigned int irq)
+static inline int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
{
return -EINVAL;
}
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 6b8ca3a..eae642b 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -624,6 +624,7 @@ static int __init acpi_parse_hpet(struct acpi_table_header *table)
}
hpet_address = hpet_tbl->address.address;
+ hpet_blockid = hpet_tbl->sequence;
/*
* Some broken BIOSes advertise HPET at 0x0. We really do not
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index d2ed6c5..d9c6f14 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3254,7 +3254,8 @@ void destroy_irq(unsigned int irq)
* MSI message composition
*/
#ifdef CONFIG_PCI_MSI
-static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
+ struct msi_msg *msg, u8 hpet_id)
{
struct irq_cfg *cfg;
int err;
@@ -3288,7 +3289,10 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_ms
irte.dest_id = IRTE_DEST(dest);
/* Set source-id of interrupt request */
- set_msi_sid(&irte, pdev);
+ if (pdev)
+ set_msi_sid(&irte, pdev);
+ else
+ set_hpet_sid(&irte, hpet_id);
modify_irte(irq, &irte);
@@ -3453,7 +3457,7 @@ static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
int ret;
struct msi_msg msg;
- ret = msi_compose_msg(dev, irq, &msg);
+ ret = msi_compose_msg(dev, irq, &msg, -1);
if (ret < 0)
return ret;
@@ -3586,7 +3590,7 @@ int arch_setup_dmar_msi(unsigned int irq)
int ret;
struct msi_msg msg;
- ret = msi_compose_msg(NULL, irq, &msg);
+ ret = msi_compose_msg(NULL, irq, &msg, -1);
if (ret < 0)
return ret;
dmar_msi_write(irq, &msg);
@@ -3626,6 +3630,19 @@ static int hpet_msi_set_affinity(unsigned int irq, const struct cpumask *mask)
#endif /* CONFIG_SMP */
+static struct irq_chip ir_hpet_msi_type = {
+ .name = "IR-HPET_MSI",
+ .unmask = hpet_msi_unmask,
+ .mask = hpet_msi_mask,
+#ifdef CONFIG_INTR_REMAP
+ .ack = ir_ack_apic_edge,
+#ifdef CONFIG_SMP
+ .set_affinity = ir_set_msi_irq_affinity,
+#endif
+#endif
+ .retrigger = ioapic_retrigger_irq,
+};
+
static struct irq_chip hpet_msi_type = {
.name = "HPET_MSI",
.unmask = hpet_msi_unmask,
@@ -3637,20 +3654,36 @@ static struct irq_chip hpet_msi_type = {
.retrigger = ioapic_retrigger_irq,
};
-int arch_setup_hpet_msi(unsigned int irq)
+int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
{
int ret;
struct msi_msg msg;
struct irq_desc *desc = irq_to_desc(irq);
- ret = msi_compose_msg(NULL, irq, &msg);
+ if (intr_remapping_enabled) {
+ struct intel_iommu *iommu = map_hpet_to_ir(id);
+ int index;
+
+ if (!iommu)
+ return -1;
+
+ index = alloc_irte(iommu, irq, 1);
+ if (index < 0)
+ return -1;
+ }
+
+ ret = msi_compose_msg(NULL, irq, &msg, id);
if (ret < 0)
return ret;
hpet_msi_write(irq, &msg);
desc->status |= IRQ_MOVE_PCNTXT;
- set_irq_chip_and_handler_name(irq, &hpet_msi_type, handle_edge_irq,
- "edge");
+ if (irq_remapped(irq))
+ set_irq_chip_and_handler_name(irq, &ir_hpet_msi_type,
+ handle_edge_irq, "edge");
+ else
+ set_irq_chip_and_handler_name(irq, &hpet_msi_type,
+ handle_edge_irq, "edge");
return 0;
}
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index dedc2bd..ba6e658 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -33,6 +33,7 @@
* HPET address is set in acpi/boot.c, when an ACPI entry exists
*/
unsigned long hpet_address;
+u8 hpet_blockid; /* OS timer block num */
#ifdef CONFIG_PCI_MSI
static unsigned long hpet_num_timers;
#endif
@@ -47,12 +48,12 @@ struct hpet_dev {
char name[10];
};
-unsigned long hpet_readl(unsigned long a)
+inline unsigned int hpet_readl(unsigned int a)
{
return readl(hpet_virt_address + a);
}
-static inline void hpet_writel(unsigned long d, unsigned long a)
+static inline void hpet_writel(unsigned int d, unsigned int a)
{
writel(d, hpet_virt_address + a);
}
@@ -167,7 +168,7 @@ do { \
static void hpet_reserve_msi_timers(struct hpet_data *hd);
-static void hpet_reserve_platform_timers(unsigned long id)
+static void hpet_reserve_platform_timers(unsigned int id)
{
struct hpet __iomem *hpet = hpet_virt_address;
struct hpet_timer __iomem *timer = &hpet->hpet_timers[2];
@@ -205,7 +206,7 @@ static void hpet_reserve_platform_timers(unsigned long id)
}
#else
-static void hpet_reserve_platform_timers(unsigned long id) { }
+static void hpet_reserve_platform_timers(unsigned int id) { }
#endif
/*
@@ -246,7 +247,7 @@ static void hpet_reset_counter(void)
static void hpet_start_counter(void)
{
- unsigned long cfg = hpet_readl(HPET_CFG);
+ unsigned int cfg = hpet_readl(HPET_CFG);
cfg |= HPET_CFG_ENABLE;
hpet_writel(cfg, HPET_CFG);
}
@@ -271,7 +272,7 @@ static void hpet_resume_counter(void)
static void hpet_enable_legacy_int(void)
{
- unsigned long cfg = hpet_readl(HPET_CFG);
+ unsigned int cfg = hpet_readl(HPET_CFG);
cfg |= HPET_CFG_LEGACY;
hpet_writel(cfg, HPET_CFG);
@@ -314,7 +315,7 @@ static int hpet_setup_msi_irq(unsigned int irq);
static void hpet_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt, int timer)
{
- unsigned long cfg, cmp, now;
+ unsigned int cfg, cmp, now;
uint64_t delta;
switch (mode) {
@@ -323,7 +324,7 @@ static void hpet_set_mode(enum clock_event_mode mode,
delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult;
delta >>= evt->shift;
now = hpet_readl(HPET_COUNTER);
- cmp = now + (unsigned long) delta;
+ cmp = now + (unsigned int) delta;
cfg = hpet_readl(HPET_Tn_CFG(timer));
/* Make sure we use edge triggered interrupts */
cfg &= ~HPET_TN_LEVEL;
@@ -339,7 +340,7 @@ static void hpet_set_mode(enum clock_event_mode mode,
* (See AMD-8111 HyperTransport I/O Hub Data Sheet,
* Publication # 24674)
*/
- hpet_writel((unsigned long) delta, HPET_Tn_CMP(timer));
+ hpet_writel((unsigned int) delta, HPET_Tn_CMP(timer));
hpet_start_counter();
hpet_print_config();
break;
@@ -383,13 +384,24 @@ static int hpet_next_event(unsigned long delta,
hpet_writel(cnt, HPET_Tn_CMP(timer));
/*
- * We need to read back the CMP register to make sure that
- * what we wrote hit the chip before we compare it to the
- * counter.
+ * We need to read back the CMP register on certain HPET
+ * implementations (ATI chipsets) which seem to delay the
+ * transfer of the compare register into the internal compare
+ * logic. With small deltas this might actually be too late as
+ * the counter could already be higher than the compare value
+ * at that point and we would wait for the next hpet interrupt
+ * forever. We found out that reading the CMP register back
+ * forces the transfer so we can rely on the comparison with
+ * the counter register below. If the read back from the
+ * compare register does not match the value we programmed
+ * then we might have a real hardware problem. We can not do
+ * much about it here, but at least alert the user/admin with
+ * a prominent warning.
*/
- WARN_ON_ONCE((u32)hpet_readl(HPET_Tn_CMP(timer)) != cnt);
+ WARN_ONCE(hpet_readl(HPET_Tn_CMP(timer)) != cnt,
+ KERN_WARNING "hpet: compare register read back failed.\n");
- return (s32)((u32)hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;
+ return (s32)(hpet_readl(HPET_COUNTER) - cnt) >= 0 ? -ETIME : 0;
}
static void hpet_legacy_set_mode(enum clock_event_mode mode,
@@ -415,7 +427,7 @@ static struct hpet_dev *hpet_devs;
void hpet_msi_unmask(unsigned int irq)
{
struct hpet_dev *hdev = get_irq_data(irq);
- unsigned long cfg;
+ unsigned int cfg;
/* unmask it */
cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
@@ -425,7 +437,7 @@ void hpet_msi_unmask(unsigned int irq)
void hpet_msi_mask(unsigned int irq)
{
- unsigned long cfg;
+ unsigned int cfg;
struct hpet_dev *hdev = get_irq_data(irq);
/* mask it */
@@ -467,7 +479,7 @@ static int hpet_msi_next_event(unsigned long delta,
static int hpet_setup_msi_irq(unsigned int irq)
{
- if (arch_setup_hpet_msi(irq)) {
+ if (arch_setup_hpet_msi(irq, hpet_blockid)) {
destroy_irq(irq);
return -EINVAL;
}
@@ -584,6 +596,8 @@ static void hpet_msi_capability_lookup(unsigned int start_timer)
unsigned int num_timers_used = 0;
int i;
+ if (boot_cpu_has(X86_FEATURE_ARAT))
+ return;
id = hpet_readl(HPET_ID);
num_timers = ((id & HPET_ID_NUMBER) >> HPET_ID_NUMBER_SHIFT);
@@ -598,7 +612,7 @@ static void hpet_msi_capability_lookup(unsigned int start_timer)
for (i = start_timer; i < num_timers - RESERVE_TIMERS; i++) {
struct hpet_dev *hdev = &hpet_devs[num_timers_used];
- unsigned long cfg = hpet_readl(HPET_Tn_CFG(i));
+ unsigned int cfg = hpet_readl(HPET_Tn_CFG(i));
/* Only consider HPET timer with MSI support */
if (!(cfg & HPET_TN_FSB_CAP))
@@ -813,7 +827,7 @@ static int hpet_clocksource_register(void)
*/
int __init hpet_enable(void)
{
- unsigned long id;
+ unsigned int id;
int i;
if (!is_hpet_capable())
@@ -872,10 +886,8 @@ int __init hpet_enable(void)
if (id & HPET_ID_LEGSUP) {
hpet_legacy_clockevent_register();
- hpet_msi_capability_lookup(2);
return 1;
}
- hpet_msi_capability_lookup(0);
return 0;
out_nohpet:
@@ -908,9 +920,17 @@ static __init int hpet_late_init(void)
if (!hpet_virt_address)
return -ENODEV;
+ if (hpet_readl(HPET_ID) & HPET_ID_LEGSUP)
+ hpet_msi_capability_lookup(2);
+ else
+ hpet_msi_capability_lookup(0);
+
hpet_reserve_platform_timers(hpet_readl(HPET_ID));
hpet_print_config();
+ if (boot_cpu_has(X86_FEATURE_ARAT))
+ return 0;
+
for_each_online_cpu(cpu) {
hpet_cpuhp_notify(NULL, CPU_ONLINE, (void *)(long)cpu);
}
@@ -925,7 +945,7 @@ fs_initcall(hpet_late_init);
void hpet_disable(void)
{
if (is_hpet_capable()) {
- unsigned long cfg = hpet_readl(HPET_CFG);
+ unsigned int cfg = hpet_readl(HPET_CFG);
if (hpet_legacy_int_enabled) {
cfg &= ~HPET_CFG_LEGACY;
@@ -965,8 +985,8 @@ static int hpet_prev_update_sec;
static struct rtc_time hpet_alarm_time;
static unsigned long hpet_pie_count;
static u32 hpet_t1_cmp;
-static unsigned long hpet_default_delta;
-static unsigned long hpet_pie_delta;
+static u32 hpet_default_delta;
+static u32 hpet_pie_delta;
static unsigned long hpet_pie_limit;
static rtc_irq_handler irq_handler;
@@ -1017,7 +1037,8 @@ EXPORT_SYMBOL_GPL(hpet_unregister_irq_handler);
*/
int hpet_rtc_timer_init(void)
{
- unsigned long cfg, cnt, delta, flags;
+ unsigned int cfg, cnt, delta;
+ unsigned long flags;
if (!is_hpet_enabled())
return 0;
@@ -1027,7 +1048,7 @@ int hpet_rtc_timer_init(void)
clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT;
- hpet_default_delta = (unsigned long) clc;
+ hpet_default_delta = clc;
}
if (!(hpet_rtc_flags & RTC_PIE) || hpet_pie_limit)
@@ -1113,7 +1134,7 @@ int hpet_set_periodic_freq(unsigned long freq)
clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
do_div(clc, freq);
clc >>= hpet_clockevent.shift;
- hpet_pie_delta = (unsigned long) clc;
+ hpet_pie_delta = clc;
}
return 1;
}
@@ -1127,7 +1148,7 @@ EXPORT_SYMBOL_GPL(hpet_rtc_dropped_irq);
static void hpet_rtc_timer_reinit(void)
{
- unsigned long cfg, delta;
+ unsigned int cfg, delta;
int lost_ints = -1;
if (unlikely(!hpet_rtc_flags)) {
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 4f5b871..2cc3f70 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -2,6 +2,7 @@
#include <linux/dmar.h>
#include <linux/spinlock.h>
#include <linux/jiffies.h>
+#include <linux/hpet.h>
#include <linux/pci.h>
#include <linux/irq.h>
#include <asm/io_apic.h>
@@ -14,7 +15,8 @@
#include "pci.h"
static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
-static int ir_ioapic_num;
+static struct hpet_scope ir_hpet[MAX_HPET_TBS];
+static int ir_ioapic_num, ir_hpet_num;
int intr_remapping_enabled;
static int disable_intremap;
@@ -351,6 +353,16 @@ int flush_irte(int irq)
return rc;
}
+struct intel_iommu *map_hpet_to_ir(u8 hpet_id)
+{
+ int i;
+
+ for (i = 0; i < MAX_HPET_TBS; i++)
+ if (ir_hpet[i].id == hpet_id)
+ return ir_hpet[i].iommu;
+ return NULL;
+}
+
struct intel_iommu *map_ioapic_to_ir(int apic)
{
int i;
@@ -478,6 +490,36 @@ int set_ioapic_sid(struct irte *irte, int apic)
return 0;
}
+int set_hpet_sid(struct irte *irte, u8 id)
+{
+ int i;
+ u16 sid = 0;
+
+ if (!irte)
+ return -1;
+
+ for (i = 0; i < MAX_HPET_TBS; i++) {
+ if (ir_hpet[i].id == id) {
+ sid = (ir_hpet[i].bus << 8) | ir_hpet[i].devfn;
+ break;
+ }
+ }
+
+ if (sid == 0) {
+ pr_warning("Failed to set source-id of HPET block (%d)\n", id);
+ return -1;
+ }
+
+ /*
+ * Should really use SQ_ALL_16. Some platforms are broken.
+ * While we figure out the right quirks for these broken platforms, use
+ * SQ_13_IGNORE_3 for now.
+ */
+ set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_13_IGNORE_3, sid);
+
+ return 0;
+}
+
int set_msi_sid(struct irte *irte, struct pci_dev *dev)
{
struct pci_dev *bridge;
@@ -711,6 +753,34 @@ error:
return -1;
}
+static void ir_parse_one_hpet_scope(struct acpi_dmar_device_scope *scope,
+ struct intel_iommu *iommu)
+{
+ struct acpi_dmar_pci_path *path;
+ u8 bus;
+ int count;
+
+ bus = scope->bus;
+ path = (struct acpi_dmar_pci_path *)(scope + 1);
+ count = (scope->length - sizeof(struct acpi_dmar_device_scope))
+ / sizeof(struct acpi_dmar_pci_path);
+
+ while (--count > 0) {
+ /*
+ * Access PCI directly due to the PCI
+ * subsystem isn't initialized yet.
+ */
+ bus = read_pci_config_byte(bus, path->dev, path->fn,
+ PCI_SECONDARY_BUS);
+ path++;
+ }
+ ir_hpet[ir_hpet_num].bus = bus;
+ ir_hpet[ir_hpet_num].devfn = PCI_DEVFN(path->dev, path->fn);
+ ir_hpet[ir_hpet_num].iommu = iommu;
+ ir_hpet[ir_hpet_num].id = scope->enumeration_id;
+ ir_hpet_num++;
+}
+
static void ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope,
struct intel_iommu *iommu)
{
@@ -740,8 +810,8 @@ static void ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope,
ir_ioapic_num++;
}
-static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
- struct intel_iommu *iommu)
+static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header,
+ struct intel_iommu *iommu)
{
struct acpi_dmar_hardware_unit *drhd;
struct acpi_dmar_device_scope *scope;
@@ -765,6 +835,17 @@ static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
drhd->address);
ir_parse_one_ioapic_scope(scope, iommu);
+ } else if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_HPET) {
+ if (ir_hpet_num == MAX_HPET_TBS) {
+ printk(KERN_WARNING "Exceeded Max HPET blocks\n");
+ return -1;
+ }
+
+ printk(KERN_INFO "HPET id %d under DRHD base"
+ " 0x%Lx\n", scope->enumeration_id,
+ drhd->address);
+
+ ir_parse_one_hpet_scope(scope, iommu);
}
start += scope->length;
}
@@ -785,7 +866,7 @@ int __init parse_ioapics_under_ir(void)
struct intel_iommu *iommu = drhd->iommu;
if (ecap_ir_support(iommu->ecap)) {
- if (ir_parse_ioapic_scope(drhd->hdr, iommu))
+ if (ir_parse_ioapic_hpet_scope(drhd->hdr, iommu))
return -1;
ir_supported = 1;
diff --git a/drivers/pci/intr_remapping.h b/drivers/pci/intr_remapping.h
index 63a263c..5662fec 100644
--- a/drivers/pci/intr_remapping.h
+++ b/drivers/pci/intr_remapping.h
@@ -7,4 +7,11 @@ struct ioapic_scope {
unsigned int devfn; /* PCI devfn number */
};
+struct hpet_scope {
+ struct intel_iommu *iommu;
+ u8 id;
+ unsigned int bus;
+ unsigned int devfn;
+};
+
#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 4a2b162..69a6fba 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -126,7 +126,9 @@ extern int free_irte(int irq);
extern int irq_remapped(int irq);
extern struct intel_iommu *map_dev_to_ir(struct pci_dev *dev);
extern struct intel_iommu *map_ioapic_to_ir(int apic);
+extern struct intel_iommu *map_hpet_to_ir(u8 id);
extern int set_ioapic_sid(struct irte *irte, int apic);
+extern int set_hpet_sid(struct irte *irte, u8 id);
extern int set_msi_sid(struct irte *irte, struct pci_dev *dev);
#else
static inline int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
@@ -158,10 +160,18 @@ static inline struct intel_iommu *map_ioapic_to_ir(int apic)
{
return NULL;
}
+static inline struct intel_iommu *map_hpet_to_ir(unsigned int hpet_id)
+{
+ return NULL;
+}
static inline int set_ioapic_sid(struct irte *irte, int apic)
{
return 0;
}
+static inline int set_hpet_sid(struct irte *irte, u8 id)
+{
+ return -1;
+}
static inline int set_msi_sid(struct irte *irte, struct pci_dev *dev)
{
return 0;
diff --git a/include/linux/hpet.h b/include/linux/hpet.h
index 79f63a2..219ca4f 100644
--- a/include/linux/hpet.h
+++ b/include/linux/hpet.h
@@ -126,4 +126,6 @@ struct hpet_info {
#define HPET_DPI _IO('h', 0x05) /* disable periodic */
#define HPET_IRQFREQ _IOW('h', 0x6, unsigned long) /* IRQFREQ usec */
+#define MAX_HPET_TBS 8 /* maximum hpet timer blocks */
+
#endif /* !__HPET__ */
--
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