From: Jack Steiner <steiner@sgi.com>
To: mingo@elte.hu, tglx@linutronix.de
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH] x86, UV: blade-local memory
Date: Mon, 27 Jul 2009 09:35:07 -0500 [thread overview]
Message-ID: <20090727143507.GA7006@sgi.com> (raw)
UV blades may not have any blade-local memory. Add a field (nid) to the UV
blade structure to indicates whether the node has local memory.
This is needed by the GRU driver (pushed separately).
Signed-off-by: Jack Steiner <steiner@sgi.com>
---
arch/x86/include/asm/uv/uv_hub.h | 7 +++++++
arch/x86/kernel/apic/x2apic_uv_x.c | 5 +++++
2 files changed, 12 insertions(+)
Index: linux/arch/x86/include/asm/uv/uv_hub.h
===================================================================
--- linux.orig/arch/x86/include/asm/uv/uv_hub.h 2009-07-23 09:17:15.000000000 -0500
+++ linux/arch/x86/include/asm/uv/uv_hub.h 2009-07-23 09:44:41.000000000 -0500
@@ -327,6 +327,7 @@ struct uv_blade_info {
unsigned short nr_possible_cpus;
unsigned short nr_online_cpus;
unsigned short pnode;
+ short memory_nid;
};
extern struct uv_blade_info *uv_blade_info;
extern short *uv_node_to_blade;
@@ -363,6 +364,12 @@ static inline int uv_blade_to_pnode(int
return uv_blade_info[bid].pnode;
}
+/* Nid of memory node on blade. -1 if no blade-local memory */
+static inline int uv_blade_to_memory_nid(int bid)
+{
+ return uv_blade_info[bid].memory_nid;
+}
+
/* Determine the number of possible cpus on a blade */
static inline int uv_blade_nr_possible_cpus(int bid)
{
Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c 2009-07-23 09:17:15.000000000 -0500
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c 2009-07-23 09:44:41.000000000 -0500
@@ -592,6 +592,8 @@ void __init uv_system_init(void)
bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
uv_blade_info = kmalloc(bytes, GFP_KERNEL);
BUG_ON(!uv_blade_info);
+ for (blade = 0; blade < uv_num_possible_blades(); blade++)
+ uv_blade_info[blade].memory_nid = -1;
get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
@@ -630,6 +632,9 @@ void __init uv_system_init(void)
lcpu = uv_blade_info[blade].nr_possible_cpus;
uv_blade_info[blade].nr_possible_cpus++;
+ /* Any node on the blade, else will contain -1. */
+ uv_blade_info[blade].memory_nid = nid;
+
uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
uv_cpu_hub_info(cpu)->lowmem_remap_top = lowmem_redir_size;
uv_cpu_hub_info(cpu)->m_val = m_val;
--
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reply other threads:[~2009-07-27 14:35 UTC|newest]
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