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Message-ID: <20140331143700.GB29916@sgi.com>
Date: Mon, 31 Mar 2014 09:37:00 -0500
From: Dimitri Sivanich <sivanich@....com>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] x86/UV: Set n_lshift based on GAM_GR_CONFIG MMR for UV3
On Mon, Mar 31, 2014 at 09:30:11AM +0200, Ingo Molnar wrote:
> * Dimitri Sivanich <sivanich@....com> wrote:
> > @@ -843,12 +843,14 @@ void uv_cpu_init(void)
> > void __init uv_system_init(void)
> > {
> > union uvh_rh_gam_config_mmr_u m_n_config;
> > + union uv3h_gr0_gam_gr_config_u m_gr_config;
> > union uvh_node_id_u node_id;
> > unsigned long gnode_upper, lowmem_redir_base, lowmem_redir_size;
> > int bytes, nid, cpu, lcpu, pnode, blade, i, j, m_val, n_val;
> > int gnode_extra, min_pnode = 999999, max_pnode = -1;
> > unsigned long mmr_base, present, paddr;
> > unsigned short pnode_mask;
> > + unsigned char n_lshift;
> > char *hub = (is_uv1_hub() ? "UV1" :
> > (is_uv2_hub() ? "UV2" :
> > "UV3"));
> > @@ -859,6 +861,14 @@ void __init uv_system_init(void)
> > m_n_config.v = uv_read_local_mmr(UVH_RH_GAM_CONFIG_MMR );
> > m_val = m_n_config.s.m_skt;
> > n_val = m_n_config.s.n_skt;
> > + if (is_uv1_hub())
> > + n_lshift = m_val;
> > + else if (is_uv2_hub())
> > + n_lshift = m_val == 40 ? 40 : 39;
> > + else {
> > + m_gr_config.v = uv_read_local_mmr(UV3H_GR0_GAM_GR_CONFIG);
> > + n_lshift = m_gr_config.s3.m_skt;
> > + }
>
> This too should be in a helper inline, uv_system_init() is too large
> already.
Agreed.
>
> The asymmetric curly braces are also non-standard.
>
OK. How does this look?
The value of n_lshift for UV is currently set based on the socket m_val.
For UV3, set the n_lshift value based on the GAM_GR_CONFIG MMR. This will
allow bios to control the n_lshift value independent of the socket m_val.
Then n_lshift can be assigned a fixed value across a multi-partition system,
allowing for a fixed common global physical address format that is independent
of socket m_val.
Cleanup unneeded macros.
Signed-off-by: Dimitri Sivanich <sivanich@....com>
---
arch/x86/include/asm/uv/uv_hub.h | 12 ---------
arch/x86/include/asm/uv/uv_mmrs.h | 42 ++++++++++++++++++++++++++++++++-
arch/x86/kernel/apic/x2apic_uv_x.c | 26 ++++++++++++++++----
3 files changed, 63 insertions(+), 17 deletions(-)
Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -5,7 +5,7 @@
*
* SGI UV APIC functions (note: not an Intel compatible APIC)
*
- * Copyright (C) 2007-2013 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2007-2014 Silicon Graphics, Inc. All rights reserved.
*/
#include <linux/cpumask.h>
#include <linux/hardirq.h>
@@ -440,6 +440,20 @@ static __initdata struct redir_addr redi
{UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_2_MMR, UVH_RH_GAM_ALIAS210_OVERLAY_CONFIG_2_MMR},
};
+static unsigned char get_n_lshift(int m_val)
+{
+ union uv3h_gr0_gam_gr_config_u m_gr_config;
+
+ if (is_uv1_hub())
+ return m_val;
+
+ if (is_uv2_hub())
+ return m_val == 40 ? 40 : 39;
+
+ m_gr_config.v = uv_read_local_mmr(UV3H_GR0_GAM_GR_CONFIG);
+ return m_gr_config.s3.m_skt;
+}
+
static __init void get_lowmem_redirect(unsigned long *base, unsigned long *size)
{
union uvh_rh_gam_alias210_overlay_config_2_mmr_u alias;
@@ -849,6 +863,7 @@ void __init uv_system_init(void)
int gnode_extra, min_pnode = 999999, max_pnode = -1;
unsigned long mmr_base, present, paddr;
unsigned short pnode_mask;
+ unsigned char n_lshift;
char *hub = (is_uv1_hub() ? "UV1" :
(is_uv2_hub() ? "UV2" :
"UV3"));
@@ -860,6 +875,7 @@ void __init uv_system_init(void)
m_val = m_n_config.s.m_skt;
n_val = m_n_config.s.n_skt;
pnode_mask = (1 << n_val) - 1;
+ n_lshift = get_n_lshift(m_val);
mmr_base =
uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR) &
~UV_MMR_ENABLE;
@@ -867,8 +883,9 @@ void __init uv_system_init(void)
node_id.v = uv_read_local_mmr(UVH_NODE_ID);
gnode_extra = (node_id.s.node_id & ~((1 << n_val) - 1)) >> 1;
gnode_upper = ((unsigned long)gnode_extra << m_val);
- pr_info("UV: N:%d M:%d pnode_mask:0x%x gnode_upper/extra:0x%lx/0x%x\n",
- n_val, m_val, pnode_mask, gnode_upper, gnode_extra);
+ pr_info("UV: N:%d M:%d pnode_mask:0x%x gnode_upper/extra:0x%lx/0x%x n_lshift 0x%x\n",
+ n_val, m_val, pnode_mask, gnode_upper, gnode_extra,
+ n_lshift);
pr_info("UV: global MMR base 0x%lx\n", mmr_base);
@@ -935,8 +952,7 @@ void __init uv_system_init(void)
uv_cpu_hub_info(cpu)->hub_revision = uv_hub_info->hub_revision;
uv_cpu_hub_info(cpu)->m_shift = 64 - m_val;
- uv_cpu_hub_info(cpu)->n_lshift = is_uv2_1_hub() ?
- (m_val == 40 ? 40 : 39) : m_val;
+ uv_cpu_hub_info(cpu)->n_lshift = n_lshift;
pnode = uv_apicid_to_pnode(apicid);
blade = boot_pnode_to_blade(pnode);
Index: linux/arch/x86/include/asm/uv/uv_mmrs.h
===================================================================
--- linux.orig/arch/x86/include/asm/uv/uv_mmrs.h
+++ linux/arch/x86/include/asm/uv/uv_mmrs.h
@@ -5,7 +5,7 @@
*
* SGI UV MMR definitions
*
- * Copyright (C) 2007-2013 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2007-2014 Silicon Graphics, Inc. All rights reserved.
*/
#ifndef _ASM_X86_UV_UV_MMRS_H
@@ -2803,6 +2803,46 @@ union uv1h_lb_target_physical_apic_id_ma
};
/* ========================================================================= */
+/* UV3H_GR0_GAM_GR_CONFIG */
+/* ========================================================================= */
+#define UV3H_GR0_GAM_GR_CONFIG 0xc00028UL
+
+#define UV3H_GR0_GAM_GR_CONFIG_M_SKT_SHFT 0
+#define UV3H_GR0_GAM_GR_CONFIG_SUBSPACE_SHFT 10
+#define UV3H_GR0_GAM_GR_CONFIG_M_SKT_MASK 0x000000000000003fUL
+#define UV3H_GR0_GAM_GR_CONFIG_SUBSPACE_MASK 0x0000000000000400UL
+
+union uv3h_gr0_gam_gr_config_u {
+ unsigned long v;
+ struct uv3h_gr0_gam_gr_config_s {
+ unsigned long m_skt:6; /* RW */
+ unsigned long undef_6_9:4; /* Undefined */
+ unsigned long subspace:1; /* RW */
+ unsigned long reserved:53;
+ } s3;
+};
+
+/* ========================================================================= */
+/* UV3H_GR1_GAM_GR_CONFIG */
+/* ========================================================================= */
+#define UV3H_GR1_GAM_GR_CONFIG 0x1000028UL
+
+#define UV3H_GR1_GAM_GR_CONFIG_M_SKT_SHFT 0
+#define UV3H_GR1_GAM_GR_CONFIG_SUBSPACE_SHFT 10
+#define UV3H_GR1_GAM_GR_CONFIG_M_SKT_MASK 0x000000000000003fUL
+#define UV3H_GR1_GAM_GR_CONFIG_SUBSPACE_MASK 0x0000000000000400UL
+
+union uv3h_gr1_gam_gr_config_u {
+ unsigned long v;
+ struct uv3h_gr1_gam_gr_config_s {
+ unsigned long m_skt:6; /* RW */
+ unsigned long undef_6_9:4; /* Undefined */
+ unsigned long subspace:1; /* RW */
+ unsigned long reserved:53;
+ } s3;
+};
+
+/* ========================================================================= */
/* UV3H_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR */
/* ========================================================================= */
#define UV3H_RH_GAM_MMIOH_OVERLAY_CONFIG0_MMR 0x1603000UL
Index: linux/arch/x86/include/asm/uv/uv_hub.h
===================================================================
--- linux.orig/arch/x86/include/asm/uv/uv_hub.h
+++ linux/arch/x86/include/asm/uv/uv_hub.h
@@ -5,7 +5,7 @@
*
* SGI UV architectural definitions
*
- * Copyright (C) 2007-2013 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2007-2014 Silicon Graphics, Inc. All rights reserved.
*/
#ifndef _ASM_X86_UV_UV_HUB_H
@@ -204,16 +204,6 @@ static inline int is_uvx_hub(void)
return uv_hub_info->hub_revision >= UV2_HUB_REVISION_BASE;
}
-static inline int is_uv2_1_hub(void)
-{
- return uv_hub_info->hub_revision == UV2_HUB_REVISION_BASE;
-}
-
-static inline int is_uv2_2_hub(void)
-{
- return uv_hub_info->hub_revision == UV2_HUB_REVISION_BASE + 1;
-}
-
union uvh_apicid {
unsigned long v;
struct uvh_apicid_s {
--
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