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Subject[PATCH 1/6] x86_64 UV: Provide a LED driver for UV Systems
  * Add base functionality for writing to the LED's on
the x86_64 UV architecture.

Note that this is a RAS feature that allows external monitoring of
various cpu state indicators, not just providing "pretty blinking
lights", as the LED state is readable by the system controller.

Based on linux-2.6.tip/master.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/genx2apic_uv_x.c | 2 +
include/asm-x86/uv/uv_hub.h | 60 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 61 insertions(+), 1 deletion(-)

--- linux-2.6.tip.orig/arch/x86/kernel/genx2apic_uv_x.c
+++ linux-2.6.tip/arch/x86/kernel/genx2apic_uv_x.c
@@ -433,6 +433,8 @@ static __init void uv_system_init(void)
uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
uv_cpu_hub_info(cpu)->coherency_domain_number = 0;/* ZZZ */
+ uv_cpu_hub_info(cpu)->led_offset = LED_LOCAL_MMR_BASE + lcpu;
+ uv_cpu_hub_info(cpu)->led_state = 0;
uv_node_to_blade[nid] = blade;
uv_cpu_to_blade[cpu] = blade;
max_pnode = max(pnode, max_pnode);
--- linux-2.6.tip.orig/include/asm-x86/uv/uv_hub.h
+++ linux-2.6.tip/include/asm-x86/uv/uv_hub.h
@@ -123,6 +123,7 @@ struct uv_hub_info_s {
unsigned long gnode_upper;
unsigned long lowmem_remap_top;
unsigned long lowmem_remap_base;
+ unsigned long led_offset;
unsigned short pnode;
unsigned short pnode_mask;
unsigned short coherency_domain_number;
@@ -130,6 +131,7 @@ struct uv_hub_info_s {
unsigned char blade_processor_id;
unsigned char m_val;
unsigned char n_val;
+ unsigned char led_state;
};
DECLARE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
#define uv_hub_info (&__get_cpu_var(__uv_hub_info))
@@ -161,6 +163,19 @@ DECLARE_PER_CPU(struct uv_hub_info_s, __
((unsigned long)(p) << UV_GLOBAL_MMR64_PNODE_SHIFT)

#define UV_APIC_PNODE_SHIFT 6
+/* Local Bus from cpu's perspective */
+#define LOCAL_BUS_BASE 0x1c00000
+#define LOCAL_BUS_SIZE (4 * 1024 * 1024)
+
+/* LED windows - located at top of ACPI MMR space */
+#define LED_WINDOW_COUNT 64
+#define LED_LOCAL_MMR_BASE (LOCAL_BUS_BASE + LOCAL_BUS_SIZE - \
+ LED_WINDOW_COUNT)
+
+#define LED_CPU_HEARTBEAT 0x01 /* timer interrupt */
+#define LED_CPU_ACTIVITY 0x02 /* not idle */
+#define LED_CPU_BLINK 0xffff /* blink led */
+#define LED_CPU_HB_INTERVAL (HZ/2) /* blink once per second */

/*
* Macros for converting between kernel virtual addresses, socket local physical
@@ -276,6 +291,16 @@ static inline void uv_write_local_mmr(un
*uv_local_mmr_address(offset) = val;
}

+static inline unsigned char uv_read_local_mmr8(unsigned long offset)
+{
+ return *((unsigned char *)uv_local_mmr_address(offset));
+}
+
+static inline void uv_write_local_mmr8(unsigned long offset, unsigned char val)
+{
+ *((unsigned char *)uv_local_mmr_address(offset)) = val;
+}
+
/*
* Structures and definitions for converting between cpu, node, pnode, and blade
* numbers.
@@ -350,5 +375,38 @@ static inline int uv_num_possible_blades
return uv_possible_blades;
}

-#endif /* ASM_X86__UV__UV_HUB_H */
+/* Light up the leds */
+static inline void uv_set_led_bits(unsigned short value, unsigned char mask)
+{
+ unsigned char state = uv_hub_info->led_state;
+
+ if (value == LED_CPU_BLINK)
+ state ^= mask;
+ else
+ state = (state & ~mask) | (value & mask);

+ if (uv_hub_info->led_state != state) {
+ uv_hub_info->led_state = state;
+ uv_write_local_mmr8(uv_hub_info->led_offset, state);
+ }
+}
+
+/* Light up the leds */
+static inline void uv_set_led_bits_on(int cpu, unsigned short value,
+ unsigned char mask)
+
+{
+ unsigned char state = uv_cpu_hub_info(cpu)->led_state;
+
+ if (value == LED_CPU_BLINK)
+ state ^= mask;
+ else
+ state = (state & ~mask) | (value & mask);
+
+ if (uv_cpu_hub_info(cpu)->led_state != state) {
+ uv_cpu_hub_info(cpu)->led_state = state;
+ uv_write_local_mmr8(uv_cpu_hub_info(cpu)->led_offset, state);
+ }
+}
+
+#endif /* ASM_X86__UV__UV_HUB_H */
--


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