1 files changed, 61 insertions, 32 deletions

diff --git a/arch/x86/kernel/uv_time.c b/arch/x86/kernel/uv_time.c
index 583f11d5c480..2b75ef638dbc 100644
--- a/arch/x86/kernel/uv_time.c
+++ b/arch/x86/kernel/uv_time.c
@@ -74,7 +74,7 @@ struct uv_rtc_timer_head {
  */
 static struct uv_rtc_timer_head		**blade_info __read_mostly;
 
-static int				uv_rtc_enable;
+static int				uv_rtc_evt_enable;
 
 /*
  * Hardware interface routines
@@ -90,7 +90,7 @@ static void uv_rtc_send_IPI(int cpu)
 	pnode = uv_apicid_to_pnode(apicid);
 	val = (1UL << UVH_IPI_INT_SEND_SHFT) |
 	      (apicid << UVH_IPI_INT_APIC_ID_SHFT) |
-	      (GENERIC_INTERRUPT_VECTOR << UVH_IPI_INT_VECTOR_SHFT);
+	      (X86_PLATFORM_IPI_VECTOR << UVH_IPI_INT_VECTOR_SHFT);
 
 	uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 }
@@ -115,7 +115,7 @@ static int uv_setup_intr(int cpu, u64 expires)
 	uv_write_global_mmr64(pnode, UVH_EVENT_OCCURRED0_ALIAS,
 		UVH_EVENT_OCCURRED0_RTC1_MASK);
 
-	val = (GENERIC_INTERRUPT_VECTOR << UVH_RTC1_INT_CONFIG_VECTOR_SHFT) |
+	val = (X86_PLATFORM_IPI_VECTOR << UVH_RTC1_INT_CONFIG_VECTOR_SHFT) |
 		((u64)cpu_physical_id(cpu) << UVH_RTC1_INT_CONFIG_APIC_ID_SHFT);
 
 	/* Set configuration */
@@ -123,7 +123,10 @@ static int uv_setup_intr(int cpu, u64 expires)
 	/* Initialize comparator value */
 	uv_write_global_mmr64(pnode, UVH_INT_CMPB, expires);
 
-	return (expires < uv_read_rtc(NULL) && !uv_intr_pending(pnode));
+	if (uv_read_rtc(NULL) <= expires)
+		return 0;
+
+	return !uv_intr_pending(pnode);
 }
 
 /*
@@ -223,6 +226,7 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
 
 	next_cpu = head->next_cpu;
 	*t = expires;
+
 	/* Will this one be next to go off? */
 	if (next_cpu < 0 || bcpu == next_cpu ||
 			expires < head->cpu[next_cpu].expires) {
@@ -231,7 +235,7 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
 			*t = ULLONG_MAX;
 			uv_rtc_find_next_timer(head, pnode);
 			spin_unlock_irqrestore(&head->lock, flags);
-			return 1;
+			return -ETIME;
 		}
 	}
 
@@ -244,7 +248,7 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
  *
  * Returns 1 if this timer was pending.
  */
-static int uv_rtc_unset_timer(int cpu)
+static int uv_rtc_unset_timer(int cpu, int force)
 {
 	int pnode = uv_cpu_to_pnode(cpu);
 	int bid = uv_cpu_to_blade_id(cpu);
@@ -256,14 +260,15 @@ static int uv_rtc_unset_timer(int cpu)
 
 	spin_lock_irqsave(&head->lock, flags);
 
-	if (head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t)
+	if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force)
 		rc = 1;
 
-	*t = ULLONG_MAX;
-
-	/* Was the hardware setup for this timer? */
-	if (head->next_cpu == bcpu)
-		uv_rtc_find_next_timer(head, pnode);
+	if (rc) {
+		*t = ULLONG_MAX;
+		/* Was the hardware setup for this timer? */
+		if (head->next_cpu == bcpu)
+			uv_rtc_find_next_timer(head, pnode);
+	}
 
 	spin_unlock_irqrestore(&head->lock, flags);
 
@@ -277,10 +282,21 @@ static int uv_rtc_unset_timer(int cpu)
 
 /*
  * Read the RTC.
+ *
+ * Starting with HUB rev 2.0, the UV RTC register is replicated across all
+ * cachelines of it's own page.  This allows faster simultaneous reads
+ * from a given socket.
  */
 static cycle_t uv_read_rtc(struct clocksource *cs)
 {
-	return (cycle_t)uv_read_local_mmr(UVH_RTC);
+	unsigned long offset;
+
+	if (uv_get_min_hub_revision_id() == 1)
+		offset = 0;
+	else
+		offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE;
+
+	return (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
 }
 
 /*
@@ -310,32 +326,32 @@ static void uv_rtc_timer_setup(enum clock_event_mode mode,
 		break;
 	case CLOCK_EVT_MODE_UNUSED:
 	case CLOCK_EVT_MODE_SHUTDOWN:
-		uv_rtc_unset_timer(ced_cpu);
+		uv_rtc_unset_timer(ced_cpu, 1);
 		break;
 	}
 }
 
 static void uv_rtc_interrupt(void)
 {
-	struct clock_event_device *ced = &__get_cpu_var(cpu_ced);
 	int cpu = smp_processor_id();
+	struct clock_event_device *ced = &per_cpu(cpu_ced, cpu);
 
 	if (!ced || !ced->event_handler)
 		return;
 
-	if (uv_rtc_unset_timer(cpu) != 1)
+	if (uv_rtc_unset_timer(cpu, 0) != 1)
 		return;
 
 	ced->event_handler(ced);
 }
 
-static int __init uv_enable_rtc(char *str)
+static int __init uv_enable_evt_rtc(char *str)
 {
-	uv_rtc_enable = 1;
+	uv_rtc_evt_enable = 1;
 
 	return 1;
 }
-__setup("uvrtc", uv_enable_rtc);
+__setup("uvrtcevt", uv_enable_evt_rtc);
 
 static __init void uv_rtc_register_clockevents(struct work_struct *dummy)
 {
@@ -350,27 +366,32 @@ static __init int uv_rtc_setup_clock(void)
 {
 	int rc;
 
-	if (!uv_rtc_enable || !is_uv_system() || generic_interrupt_extension)
+	if (!is_uv_system())
 		return -ENODEV;
 
-	generic_interrupt_extension = uv_rtc_interrupt;
-
 	clocksource_uv.mult = clocksource_hz2mult(sn_rtc_cycles_per_second,
 				clocksource_uv.shift);
 
+	/* If single blade, prefer tsc */
+	if (uv_num_possible_blades() == 1)
+		clocksource_uv.rating = 250;
+
 	rc = clocksource_register(&clocksource_uv);
-	if (rc) {
-		generic_interrupt_extension = NULL;
+	if (rc)
+		printk(KERN_INFO "UV RTC clocksource failed rc %d\n", rc);
+	else
+		printk(KERN_INFO "UV RTC clocksource registered freq %lu MHz\n",
+			sn_rtc_cycles_per_second/(unsigned long)1E6);
+
+	if (rc || !uv_rtc_evt_enable || x86_platform_ipi_callback)
 		return rc;
-	}
 
 	/* Setup and register clockevents */
 	rc = uv_rtc_allocate_timers();
-	if (rc) {
-		clocksource_unregister(&clocksource_uv);
-		generic_interrupt_extension = NULL;
-		return rc;
-	}
+	if (rc)
+		goto error;
+
+	x86_platform_ipi_callback = uv_rtc_interrupt;
 
 	clock_event_device_uv.mult = div_sc(sn_rtc_cycles_per_second,
 				NSEC_PER_SEC, clock_event_device_uv.shift);
@@ -383,11 +404,19 @@ static __init int uv_rtc_setup_clock(void)
 
 	rc = schedule_on_each_cpu(uv_rtc_register_clockevents);
 	if (rc) {
-		clocksource_unregister(&clocksource_uv);
-		generic_interrupt_extension = NULL;
+		x86_platform_ipi_callback = NULL;
 		uv_rtc_deallocate_timers();
+		goto error;
 	}
 
+	printk(KERN_INFO "UV RTC clockevents registered\n");
+
+	return 0;
+
+error:
+	clocksource_unregister(&clocksource_uv);
+	printk(KERN_INFO "UV RTC clockevents failed rc %d\n", rc);
+
 	return rc;
 }
 arch_initcall(uv_rtc_setup_clock);