Patchwork [1/2] Add static fields to ibm,client-architecture call

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Submitter jschopp@austin.ibm.com
Date Jan. 14, 2010, 8:40 p.m.
Message ID <1263501613.4869.139.camel@jschopp-laptop>
Download mbox | patch
Permalink /patch/42925/
State Changes Requested
Headers show

Comments

jschopp@austin.ibm.com - Jan. 14, 2010, 8:40 p.m.
This patch adds 2 fields to the ibm_architecture_vec array.  

The first of these fields indicates the number of cores which Linux can
boot.  It does not account for SMT, so it may result in cpus assigned to
Linux which cannot be booted.  A second patch follows that dynamically
updates this for SMT.

The second field just indicates that our OS is Linux, and not another
OS.  The system may or may not use this hint to performance tune
settings for Linux.

Signed-off-by:Joel Schopp<jschopp@austin.ibm.com>

Patch

Index: linux-2.6.git/arch/powerpc/kernel/prom_init.c
===================================================================
--- linux-2.6.git.orig/arch/powerpc/kernel/prom_init.c
+++ linux-2.6.git/arch/powerpc/kernel/prom_init.c
@@ -654,6 +656,9 @@  static void __init early_cmdline_parse(v
#define OV5_CMO 0x00
#endif

+/* Option Vector 6: IBM PAPR hints */
+#define OV6_LINUX 0x02 /* Linux is our OS */
+
/*
  * The architecture vector has an array of PVR mask/value pairs,
  * followed by # option vectors - 1, followed by the option vectors.
@@ -665,7 +670,7 @@  static unsigned char ibm_architecture_ve
W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
- 5 - 1, /* 5 option vectors */
+ 6 - 1, /* 6 option vectors */

/* option vector 1: processor architectures supported */
3 - 2, /* length */
@@ -697,12 +702,24 @@  static unsigned char ibm_architecture_ve
0, /* don't halt */

/* option vector 5: PAPR/OF options */
- 5 - 2, /* length */
+ 13 - 2, /* length */
0, /* don't ignore, don't halt */
OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
OV5_DONATE_DEDICATE_CPU | OV5_MSI,
0,
OV5_CMO,
+ 0,
+ 0,
+ 0,
+ 0,
+ W(NR_CPUS), /* number of cores supported*/
+
+ /* option vector 6: IBM PAPR hints */
+ 4 - 2, /* length */
+ 0,
+ 0,
+ OV6_LINUX,
+
};

/* Old method - ELF header with PT_NOTE sections */