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Date: Tue, 03 Mar 2009 14:22:40 -0800
From: Randy Dunlap <randy.dunlap@...cle.com>
To: Mark Langsdorf <mark.langsdorf@....com>
CC: Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org, tglx@...utronix.de, eric@...merts.org
Subject: Re: [PATCH][retry 3] Conform L3 Cache Index Disable to Linuxstandards
From: Eric Lammerts <eric@...merts.org>
Mark Langsdorf wrote:
> x86/kernel/built-in.o: In function `store_cache_disable':
>> intel_cacheinfo.c:(.text+0xd322): undefined reference to `k8_northbridges'
>> arch/x86/kernel/built-in.o: In function `show_cache_disable':
>> intel_cacheinfo.c:(.text+0xd52c): undefined reference to `k8_northbridges'
>>
>> so i've excluded it from tip:master for now. Please resubmit a
>> fixed patch.
>
> I've tried to reproduce this problem and I can't. k8_northbridges
> is defined in <asm/k8.h> and it's included in the file. I've
> tried on i586 and x86_64 systems with both defconfig and
> allnoconfig without problem.
>
> If this problem persists, I'd appreciate if someone could email
> me instructions on how to reproduce it because I can't figure it
> out.
I reported the same problem on mmotm-02-24. You were cc-ed on it.
The email includes the failing .config file.
http://lkml.org/lkml/2009/2/25/314
> -Mark Langsdorf
> Operating System Resarch Center
> AMD
>
>
> Signed-off-by: Mark Langsdorf <mark.langsdorf@....com>
> commit 2c6521d5a6309d157682f600b0e9fa4eeccd3e1d
> Author: Mark Langsdorf <mlangsdo@...pnow.amd.com>
> Date: Fri Feb 20 15:22:00 2009 -0600
>
> Add ABI Documentation entry and fix some /sys directory formating
> issues with the L3 Cache Index Disable feature for future AMD
> processors. Add a check to disable it for family 0x10 models
> that do not support it yet.
>
> diff --git a/Documentation/ABI/testing/sysfs-devices-cache_disable b/Documentation/ABI/testing/sysfs-devices-cache_disable
> new file mode 100644
> index 0000000..d2a7292
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-devices-cache_disable
> @@ -0,0 +1,18 @@
> +What: /sys/devices/system/cpu/cpu*/cache/index*/cache_disable_X
> +Date: August 2008
> +KernelVersion: 2.6.27
> +Contact: mark.langsdorf@....com
> +Description: These files exist in every cpu's cache index directories.
> + There are currently 2 cache_disable_# files in each
> + directory. Reading from these files on a supported
> + processor will return that cache disable index value
> + for that processor and node. Writing to one of these
> + files will cause the specificed cache index to be disabled.
> +
> + Currently, only AMD Family 10h Processors support cache index
> + disable, and only for their L3 caches. See the BIOS and
> + Kernel Developer's Guide at
> + http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31116-Public-GH-BKDG_3.20_2-4-09.pdf
> + for formatting information and other details on the
> + cache index disable.
> +Users: joachim.deguara@....com
> diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
> index 8e6ce2c..5ecac89 100644
> --- a/arch/x86/kernel/cpu/intel_cacheinfo.c
> +++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
> @@ -18,6 +18,9 @@
> #include <asm/processor.h>
> #include <asm/smp.h>
>
> +#include <linux/pci.h>
> +#include <asm/k8.h>
> +
> #define LVL_1_INST 1
> #define LVL_1_DATA 2
> #define LVL_2 3
> @@ -159,14 +162,6 @@ struct _cpuid4_info_regs {
> unsigned long can_disable;
> };
>
> -#if defined(CONFIG_PCI) && defined(CONFIG_SYSFS)
> -static struct pci_device_id k8_nb_id[] = {
> - { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1103) },
> - { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1203) },
> - {}
> -};
> -#endif
> -
> unsigned short num_cache_leaves;
>
> /* AMD doesn't have CPUID4. Emulate it here to report the same
> @@ -291,6 +286,12 @@ amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf)
> {
> if (index < 3)
> return;
> + if (boot_cpu_data.x86 == 0x11)
> + return;
> +
> + if ((boot_cpu_data.x86 == 0x10) && (boot_cpu_data.x86_model < 0x15))
> + return;
> +
> this_leaf->can_disable = 1;
> }
>
> @@ -639,6 +640,64 @@ static ssize_t show_##file_name \
> return sprintf (buf, "%lu\n", (unsigned long)this_leaf->object + val); \
> }
>
> +static ssize_t show_cache_disable(struct _cpuid4_info *this_leaf, char *buf,
> + unsigned int index)
> +{
> + int node = cpu_to_node(first_cpu(this_leaf->shared_cpu_map));
> + struct pci_dev *dev = k8_northbridges[node];
> + unsigned int reg = 0;
> +
> + if (!this_leaf->can_disable)
> + return -EINVAL;
> +
> + pci_read_config_dword(dev, 0x1BC + index * 4, ®);
> + return sprintf(buf, "%x\n", reg);
> +}
> +
> +#define SHOW_CACHE_DISABLE(index) \
> +static ssize_t \
> +show_cache_disable_##index(struct _cpuid4_info *this_leaf, char *buf) \
> +{ \
> + return show_cache_disable(this_leaf, buf, index); \
> +}
> +
> +static ssize_t
> +store_cache_disable(struct _cpuid4_info *this_leaf, const char *buf,
> + size_t count, unsigned int index)
> +{
> + int node = cpu_to_node(first_cpu(this_leaf->shared_cpu_map));
> + struct pci_dev *dev = k8_northbridges[node];
> + unsigned long val = 0;
> +
> + if (!this_leaf->can_disable)
> + return -EINVAL;
> +
> + if (!capable(CAP_SYS_ADMIN))
> + return -EPERM;
> +
> + if (strict_strtoul(buf, 10, &val) < 0)
> + return -EINVAL;
> +
> + val |= 0xc0000000;
> + pci_write_config_dword(dev, 0x1BC + index * 4, val & ~0x40000000);
> + wbinvd();
> + pci_write_config_dword(dev, 0x1BC + index * 4, val);
> + return count;
> +}
> +
> +#define STORE_CACHE_DISABLE(index) \
> +static ssize_t \
> +store_cache_disable_##index(struct _cpuid4_info *this_leaf, \
> + const char *buf, size_t count) \
> +{ \
> + return store_cache_disable(this_leaf, buf, count, index); \
> +}
> +
> +SHOW_CACHE_DISABLE(0)
> +STORE_CACHE_DISABLE(0)
> +SHOW_CACHE_DISABLE(1)
> +STORE_CACHE_DISABLE(1)
> +
> show_one_plus(level, eax.split.level, 0);
> show_one_plus(coherency_line_size, ebx.split.coherency_line_size, 1);
> show_one_plus(physical_line_partition, ebx.split.physical_line_partition, 1);
> @@ -696,98 +755,6 @@ static ssize_t show_type(struct _cpuid4_info *this_leaf, char *buf)
> #define to_object(k) container_of(k, struct _index_kobject, kobj)
> #define to_attr(a) container_of(a, struct _cache_attr, attr)
>
> -#ifdef CONFIG_PCI
> -static struct pci_dev *get_k8_northbridge(int node)
> -{
> - struct pci_dev *dev = NULL;
> - int i;
> -
> - for (i = 0; i <= node; i++) {
> - do {
> - dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
> - if (!dev)
> - break;
> - } while (!pci_match_id(&k8_nb_id[0], dev));
> - if (!dev)
> - break;
> - }
> - return dev;
> -}
> -#else
> -static struct pci_dev *get_k8_northbridge(int node)
> -{
> - return NULL;
> -}
> -#endif
> -
> -static ssize_t show_cache_disable(struct _cpuid4_info *this_leaf, char *buf)
> -{
> - const struct cpumask *mask = to_cpumask(this_leaf->shared_cpu_map);
> - int node = cpu_to_node(cpumask_first(mask));
> - struct pci_dev *dev = NULL;
> - ssize_t ret = 0;
> - int i;
> -
> - if (!this_leaf->can_disable)
> - return sprintf(buf, "Feature not enabled\n");
> -
> - dev = get_k8_northbridge(node);
> - if (!dev) {
> - printk(KERN_ERR "Attempting AMD northbridge operation on a system with no northbridge\n");
> - return -EINVAL;
> - }
> -
> - for (i = 0; i < 2; i++) {
> - unsigned int reg;
> -
> - pci_read_config_dword(dev, 0x1BC + i * 4, ®);
> -
> - ret += sprintf(buf, "%sEntry: %d\n", buf, i);
> - ret += sprintf(buf, "%sReads: %s\tNew Entries: %s\n",
> - buf,
> - reg & 0x80000000 ? "Disabled" : "Allowed",
> - reg & 0x40000000 ? "Disabled" : "Allowed");
> - ret += sprintf(buf, "%sSubCache: %x\tIndex: %x\n",
> - buf, (reg & 0x30000) >> 16, reg & 0xfff);
> - }
> - return ret;
> -}
> -
> -static ssize_t
> -store_cache_disable(struct _cpuid4_info *this_leaf, const char *buf,
> - size_t count)
> -{
> - const struct cpumask *mask = to_cpumask(this_leaf->shared_cpu_map);
> - int node = cpu_to_node(cpumask_first(mask));
> - struct pci_dev *dev = NULL;
> - unsigned int ret, index, val;
> -
> - if (!this_leaf->can_disable)
> - return 0;
> -
> - if (strlen(buf) > 15)
> - return -EINVAL;
> -
> - ret = sscanf(buf, "%x %x", &index, &val);
> - if (ret != 2)
> - return -EINVAL;
> - if (index > 1)
> - return -EINVAL;
> -
> - val |= 0xc0000000;
> - dev = get_k8_northbridge(node);
> - if (!dev) {
> - printk(KERN_ERR "Attempting AMD northbridge operation on a system with no northbridge\n");
> - return -EINVAL;
> - }
> -
> - pci_write_config_dword(dev, 0x1BC + index * 4, val & ~0x40000000);
> - wbinvd();
> - pci_write_config_dword(dev, 0x1BC + index * 4, val);
> -
> - return 1;
> -}
> -
> struct _cache_attr {
> struct attribute attr;
> ssize_t (*show)(struct _cpuid4_info *, char *);
> @@ -808,7 +775,11 @@ define_one_ro(size);
> define_one_ro(shared_cpu_map);
> define_one_ro(shared_cpu_list);
>
> -static struct _cache_attr cache_disable = __ATTR(cache_disable, 0644, show_cache_disable, store_cache_disable);
> +static struct _cache_attr cache_disable_0 = __ATTR(cache_disable_0, 0644,
> + show_cache_disable_0, store_cache_disable_0);
> +static struct _cache_attr cache_disable_1 = __ATTR(cache_disable_1, 0644,
> + show_cache_disable_1, store_cache_disable_1);
> +
>
> static struct attribute * default_attrs[] = {
> &type.attr,
> @@ -820,7 +791,8 @@ static struct attribute * default_attrs[] = {
> &size.attr,
> &shared_cpu_map.attr,
> &shared_cpu_list.attr,
> - &cache_disable.attr,
> + &cache_disable_0.attr,
> + &cache_disable_1.attr,
> NULL
> };
--
~Randy
--
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