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x86, uv: Add function retrieving node controller revision number

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Add function for determining the revision id of the SGI UV
node controller chip (HUB). This function is needed in a
subsequent patch.

Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20100112210904.GA24546@sgi.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Jack Steiner 2010-01-12 15:09:04 -06:00 committed by H. Peter Anvin
parent e68266b700
commit 7a1110e861
2 changed files with 18 additions and 0 deletions
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12
arch/x86/include/asm/uv/uv_hub.h
View file

@ -495,5 +495,17 @@ static inline void uv_hub_send_ipi(int pnode, int apicid, int vector)
uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
}
/*
* Get the minimum revision number of the hub chips within the partition.
* 1 - initial rev 1.0 silicon
* 2 - rev 2.0 production silicon
*/
static inline int uv_get_min_hub_revision_id(void)
{
extern int uv_min_hub_revision_id;
return uv_min_hub_revision_id;
}
#endif /* CONFIG_X86_64 */
#endif /* _ASM_X86_UV_UV_HUB_H */

6
arch/x86/kernel/apic/x2apic_uv_x.c
View file

@ -36,6 +36,8 @@ DEFINE_PER_CPU(int, x2apic_extra_bits);
static enum uv_system_type uv_system_type;
static u64 gru_start_paddr, gru_end_paddr;
int uv_min_hub_revision_id;
EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
static inline bool is_GRU_range(u64 start, u64 end)
{
@ -55,6 +57,10 @@ static int early_get_nodeid(void)
mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_NODE_ID, sizeof(*mmr));
node_id.v = *mmr;
early_iounmap(mmr, sizeof(*mmr));
/* Currently, all blades have same revision number */
uv_min_hub_revision_id = node_id.s.revision;
return node_id.s.node_id;
}