8 files changed, 199 insertions, 43 deletions

diff --git a/arch/x86/include/asm/hpet.h b/arch/x86/include/asm/hpet.h
index 1c22cb05ad6a..5d89fd2a3690 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 67e929b89875..87eee07da21f 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 c0b4468683f9..d5d498fbee4b 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3267,7 +3267,8 @@ 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;
@@ -3301,7 +3302,10 @@ 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);
 
@@ -3466,7 +3470,7 @@ 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;
 
@@ -3599,7 +3603,7 @@ 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);
@@ -3639,6 +3643,19 @@ 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,
@@ -3650,20 +3667,36 @@ 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 dedc2bddf7a5..ba6e65884603 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 0ed78a764ded..3b3658669bee 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;
@@ -343,6 +345,16 @@ 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;
@@ -470,6 +482,36 @@ 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 63a263c18415..5662fecfee60 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 5de4c9e5856d..d7cecc90ed34 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 79f63a27bcef..219ca4f6bea6 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__ */