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Date: Thu, 12 Jun 2008 12:50:10 -0700
From: "Yinghai Lu" <yhlu.kernel@...il.com>
To: "Robert Richter" <robert.richter@....com>
Cc: "Arjan van de Ven" <arjan@...radead.org>,
"Thomas Gleixner" <tglx@...utronix.de>,
"Ingo Molnar" <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
"Andi Kleen" <andi@...stfloor.org>
Subject: Re: [PATCH 2/2] x86: Move PCI IO ECS code to x86/pci
On Thu, Jun 12, 2008 at 11:19 AM, Robert Richter <robert.richter@....com> wrote:
> "Form follows function". Code is now where it belongs to.
>
> Signed-off-by: Robert Richter <robert.richter@....com>
> ---
> arch/x86/kernel/cpu/amd.c | 3 ---
> arch/x86/kernel/cpu/amd_64.c | 4 ----
> arch/x86/kernel/cpu/cpu.h | 2 --
> arch/x86/kernel/setup.c | 13 -------------
> arch/x86/pci/Makefile_32 | 1 +
> arch/x86/pci/amd_bus.c | 32 ++++++++++++++++++++++++++++++++
> arch/x86/pci/direct.c | 16 +++++++++-------
> arch/x86/pci/pci.h | 1 +
> include/asm-x86/cpufeature.h | 2 --
> 9 files changed, 43 insertions(+), 31 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index acc891a..81a07ca 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -266,9 +266,6 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
>
> if (cpu_has_xmm2)
> set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
> -
> - if (c->x86 == 0x10)
> - amd_enable_pci_ext_cfg(c);
> }
>
> static unsigned int __cpuinit amd_size_cache(struct cpuinfo_x86 *c, unsigned int size)
> diff --git a/arch/x86/kernel/cpu/amd_64.c b/arch/x86/kernel/cpu/amd_64.c
> index f8d2058..250bfe6 100644
> --- a/arch/x86/kernel/cpu/amd_64.c
> +++ b/arch/x86/kernel/cpu/amd_64.c
> @@ -6,7 +6,6 @@
> #include <asm/cacheflush.h>
>
> #include <mach_apic.h>
> -#include "cpu.h"
>
> extern int __cpuinit get_model_name(struct cpuinfo_x86 *c);
> extern void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c);
> @@ -187,9 +186,6 @@ void __cpuinit init_amd(struct cpuinfo_x86 *c)
> if (c->x86 == 0x10)
> fam10h_check_enable_mmcfg();
>
> - if (c->x86 == 0x10)
> - amd_enable_pci_ext_cfg(c);
> -
> if (c == &boot_cpu_data && c->x86 >= 0xf && c->x86 <= 0x11) {
> unsigned long long tseg;
>
> diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
> index f5d5bb1..40ad189 100644
> --- a/arch/x86/kernel/cpu/cpu.h
> +++ b/arch/x86/kernel/cpu/cpu.h
> @@ -39,5 +39,3 @@ extern int get_model_name(struct cpuinfo_x86 *c);
> extern void display_cacheinfo(struct cpuinfo_x86 *c);
>
> #endif /* CONFIG_X86_32 */
> -
> -extern void __cpuinit amd_enable_pci_ext_cfg(struct cpuinfo_x86 *c);
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 20e14db..6f80b85 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -137,16 +137,3 @@ void __init setup_per_cpu_areas(void)
> }
>
> #endif
> -#define ENABLE_CF8_EXT_CFG (1ULL << 46)
> -
> -void __cpuinit amd_enable_pci_ext_cfg(struct cpuinfo_x86 *c)
> -{
> - u64 reg;
> - rdmsrl(MSR_AMD64_NB_CFG, reg);
> - if (!(reg & ENABLE_CF8_EXT_CFG)) {
> - reg |= ENABLE_CF8_EXT_CFG;
> - wrmsrl(MSR_AMD64_NB_CFG, reg);
> - }
> - set_cpu_cap(c, X86_FEATURE_PCI_EXT_CFG);
> -}
> -
> diff --git a/arch/x86/pci/Makefile_32 b/arch/x86/pci/Makefile_32
> index 89ec35d..f647e7e 100644
> --- a/arch/x86/pci/Makefile_32
> +++ b/arch/x86/pci/Makefile_32
> @@ -22,3 +22,4 @@ pci-$(CONFIG_X86_NUMAQ) := numa.o irq.o
> pci-$(CONFIG_NUMA) += mp_bus_to_node.o
>
> obj-y += $(pci-y) common.o early.o
> +obj-y += amd_bus.o
> diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
> index 5c2799c..15f505d 100644
> --- a/arch/x86/pci/amd_bus.c
> +++ b/arch/x86/pci/amd_bus.c
> @@ -1,5 +1,9 @@
> #include <linux/init.h>
> #include <linux/pci.h>
> +#include "pci.h"
> +
> +#ifdef CONFIG_X86_64
> +
> #include <asm/pci-direct.h>
> #include <asm/mpspec.h>
> #include <linux/cpumask.h>
> @@ -526,3 +530,31 @@ static int __init early_fill_mp_bus_info(void)
> }
>
> postcore_initcall(early_fill_mp_bus_info);
> +
> +#endif
> +
> +/* common 32/64 bit code */
> +
> +#define ENABLE_CF8_EXT_CFG (1ULL << 46)
> +
> +static void enable_pci_io_ecs_per_cpu(void *unused)
> +{
> + u64 reg;
> + rdmsrl(MSR_AMD64_NB_CFG, reg);
> + if (!(reg & ENABLE_CF8_EXT_CFG)) {
> + reg |= ENABLE_CF8_EXT_CFG;
> + wrmsrl(MSR_AMD64_NB_CFG, reg);
> + }
> +}
> +
> +static int __init enable_pci_io_ecs(void)
> +{
> + /* assume all cpus from fam10h have IO ECS */
> + if (boot_cpu_data.x86 < 0x10)
> + return 0;
> + on_each_cpu(enable_pci_io_ecs_per_cpu, NULL, 1, 1);
how about some cpu hotplug? i mean if you limit that when booting and
later use "echo 1 > /sys/.../online" etc to get it online.
YH
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