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Subject[PATCH 02/10] Add driver auto probing for x86 features v2
Date
From: Andi Kleen <ak@linux.intel.com>

Old patchkit, resurrect due to popular demand.

There's a growing number of drivers that support a specific x86 feature
or CPU. Currently loading these drivers currently on a generic
distribution requires various driver specific hacks and it often
doesn't work.

This patch adds auto probing for drivers based on the x86 cpuid
information, in particular based on vendor/family/model number
and also based on CPUID feature bits.

For example a common issue is not loading the SSE 4.2 accelerated
CRC module: this can significantly lower the performance of BTRFS
which relies on fast CRC.

Another issue is loading the right CPUFREQ driver for the current CPU.
Currently distributions often try all all possible driver until
one sticks, which is not really a good way to do this.

It works with existing udev without any changes. The code
exports the x86 information as a generic string in sysfs
that can be matched by udev's pattern matching.

This scheme does not support numeric ranges, so if you want to
handle e.g. ranges of model numbers they have to be encoded
in ASCII or simply all models or families listed. Fixing
that would require changing udev.

Another issue is that udev will happily load all drivers that match,
there is currently no nice way to stop a specific driver from
being loaded if it's not needed (e.g. if you don't need fast CRC)
But there are not that many cpu specific drivers around and they're
all not that bloated, so this isn't a particularly serious issue.

Originally this patch added the modalias to the normal cpu
sysdevs. However sysdevs don't have all the infrastructure
needed for udev, so it couldn't really autoload drivers.
This patch instead adds the CPU modaliases to the cpuid devices,
which are real devices with full support for udev. This implies
that the cpuid driver has to be loaded to use this.

This patch just adds infrastructure, some driver conversions
in followups.

Thanks to Kay for helping with some sysfs magic.

v2: Constifcation, some updates

Cc: davej@redhat.com
Cc: trenn@suse.de
Cc: kay.sievers@vrfy.org
Cc: axboe@kernel.dk
Cc: hpa@zytor.com
Cc: herbert@gondor.apana.org.au
Cc: ying.huang@intel.com
Cc: lenb@kernel.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/include/asm/cpu_device_id.h | 13 +++++++
arch/x86/kernel/cpu/Makefile | 1 +
arch/x86/kernel/cpu/match.c | 48 ++++++++++++++++++++++++++++
arch/x86/kernel/cpuid.c | 58 +++++++++++++++++++++++++++++++++-
include/linux/mod_devicetable.h | 20 ++++++++++++
scripts/mod/file2alias.c | 27 ++++++++++++++++
6 files changed, 166 insertions(+), 1 deletions(-)
create mode 100755 arch/x86/include/asm/cpu_device_id.h
create mode 100644 arch/x86/kernel/cpu/match.c
diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
new file mode 100755
index 0000000..ff501e5
--- /dev/null
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -0,0 +1,13 @@
+#ifndef _CPU_DEVICE_ID
+#define _CPU_DEVICE_ID 1
+
+/*
+ * Declare drivers belonging to specific x86 CPUs
+ * Similar in spirit to pci_device_id and related PCI functions
+ */
+
+#include <linux/mod_devicetable.h>
+
+extern const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match);
+
+#endif
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 25f24dc..6ab6aa2 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -16,6 +16,7 @@ obj-y := intel_cacheinfo.o scattered.o topology.o
obj-y += proc.o capflags.o powerflags.o common.o
obj-y += vmware.o hypervisor.o sched.o mshyperv.o
obj-y += rdrand.o
+obj-y += match.o

obj-$(CONFIG_X86_32) += bugs.o
obj-$(CONFIG_X86_64) += bugs_64.o
diff --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c
new file mode 100644
index 0000000..1da7094
--- /dev/null
+++ b/arch/x86/kernel/cpu/match.c
@@ -0,0 +1,48 @@
+#include <asm/cpu_device_id.h>
+#include <asm/processor.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+
+/**
+ * x86_match_cpu - match current CPU again an array of x86_cpu_ids
+ * @match: Pointer to array of x86_cpu_ids. Last entry terminated with
+ * {}.
+ *
+ * Return the entry if the current CPU matches the entries in the
+ * passed x86_cpu_id match table. Otherwise NULL. The match table
+ * contains vendor (X86_VENDOR_*), family, model and feature bits or
+ * respective wildcard entries.
+ *
+ * A typical table entry would be to match a specific CPU
+ * { X86_VENDOR_INTEL, 6, 0x12 }
+ * or to match a specific CPU feature
+ * { X86_FEATURE_MATCH(X86_FEATURE_FOOBAR) }
+ *
+ * Fields can be wildcarded with %X86_VENDOR_ANY, %X86_FAMILY_ANY,
+ * %X86_MODEL_ANY, %X86_FEATURE_ANY or 0 (except for vendor)
+ *
+ * Arrays used to match for this should also be declared using
+ * MODULE_DEVICE_TABLE(x86_cpu, ...)
+ *
+ * This always matches against the boot cpu, assuming models and features are
+ * consistent over all CPUs.
+ */
+const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
+{
+ const struct x86_cpu_id *m;
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ for (m = match; m->vendor | m->family | m->model | m->feature; m++) {
+ if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor)
+ continue;
+ if (m->family != X86_FAMILY_ANY && c->x86 != m->family)
+ continue;
+ if (m->model != X86_MODEL_ANY && c->x86_model != m->model)
+ continue;
+ if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature))
+ continue;
+ return m;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(x86_match_cpu);
diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c
index 212a6a4..f39e91d 100644
--- a/arch/x86/kernel/cpuid.c
+++ b/arch/x86/kernel/cpuid.c
@@ -40,6 +40,7 @@
#include <linux/notifier.h>
#include <linux/uaccess.h>
#include <linux/gfp.h>
+#include <linux/slab.h>

#include <asm/processor.h>
#include <asm/msr.h>
@@ -138,13 +139,56 @@ static const struct file_operations cpuid_fops = {
.open = cpuid_open,
};

+static ssize_t print_cpu_modalias(struct device *dev,
+ struct device_attribute *attr,
+ char *bufptr)
+{
+ int size = PAGE_SIZE;
+ int i, n;
+ char *buf = bufptr;
+
+ n = snprintf(buf, size, "x86cpu:vendor:%04x:family:%04x:model:%04x:feature:",
+ boot_cpu_data.x86_vendor,
+ boot_cpu_data.x86,
+ boot_cpu_data.x86_model);
+ size -= n;
+ buf += n;
+ size -= 2;
+ for (i = 0; i < NCAPINTS*32; i++) {
+ if (boot_cpu_has(i)) {
+ n = snprintf(buf, size, ",%04x", i);
+ if (n < 0) {
+ WARN(1, "x86 features overflow page\n");
+ break;
+ }
+ size -= n;
+ buf += n;
+ }
+ }
+ *buf++ = ',';
+ *buf++ = '\n';
+ return buf - bufptr;
+}
+
+static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL);
+
static __cpuinit int cpuid_device_create(int cpu)
{
struct device *dev;
+ int err;

dev = device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, cpu), NULL,
"cpu%d", cpu);
- return IS_ERR(dev) ? PTR_ERR(dev) : 0;
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ err = device_create_file(dev, &dev_attr_modalias);
+ if (err) {
+ /* keep device around on error. attribute is optional. */
+ err = 0;
+ }
+
+ return 0;
}

static void cpuid_device_destroy(int cpu)
@@ -182,6 +226,17 @@ static char *cpuid_devnode(struct device *dev, mode_t *mode)
return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt));
}

+static int cpuid_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (buf) {
+ print_cpu_modalias(NULL, NULL, buf);
+ add_uevent_var(env, "MODALIAS=%s", buf);
+ kfree(buf);
+ }
+ return 0;
+}
+
static int __init cpuid_init(void)
{
int i, err = 0;
@@ -200,6 +255,7 @@ static int __init cpuid_init(void)
goto out_chrdev;
}
cpuid_class->devnode = cpuid_devnode;
+ cpuid_class->dev_uevent = cpuid_dev_uevent;
for_each_online_cpu(i) {
err = cpuid_device_create(i);
if (err != 0)
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 468819c..8971fec 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -542,4 +542,24 @@ struct isapnp_device_id {
kernel_ulong_t driver_data; /* data private to the driver */
};

+/*
+ * Match x86 CPUs for CPU specific drivers.
+ * See documentation of "x86_match_cpu" for details.
+ */
+
+struct x86_cpu_id {
+ __u16 vendor;
+ __u16 family;
+ __u16 model;
+ __u16 feature; /* bit index */
+ kernel_ulong_t driver_data;
+};
+
+#define X86_FEATURE_MATCH(x) { X86_VENDOR_ANY, X86_FAMILY_ANY, X86_MODEL_ANY, x }
+
+#define X86_VENDOR_ANY 0xffff
+#define X86_FAMILY_ANY 0
+#define X86_MODEL_ANY 0
+#define X86_FEATURE_ANY 0 /* Same as FPU, you can't test for that */
+
#endif /* LINUX_MOD_DEVICETABLE_H */
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index f936d1f..e5dd089 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -880,6 +880,29 @@ static int do_isapnp_entry(const char *filename,
return 1;
}

+/* LOOKS like x86cpu:vendor:VVVV:family:FFFF:model:MMMM:feature:*,FEAT,*
+ * All fields are numbers. It would be nicer to use strings for vendor
+ * and feature, but getting those out of the build system here is too
+ * complicated.
+ */
+
+static int do_x86cpu_entry(const char *filename, struct x86_cpu_id *id,
+ char *alias)
+{
+ id->feature = TO_NATIVE(id->feature);
+ id->family = TO_NATIVE(id->family);
+ id->model = TO_NATIVE(id->model);
+ id->vendor = TO_NATIVE(id->vendor);
+
+ strcpy(alias, "x86cpu:");
+ ADD(alias, "vendor:", id->vendor != X86_VENDOR_ANY, id->vendor);
+ ADD(alias, ":family:", id->family != X86_FAMILY_ANY, id->family);
+ ADD(alias, ":model:", id->model != X86_MODEL_ANY, id->model);
+ ADD(alias, ":feature:*,", id->feature != X86_FEATURE_ANY, id->feature);
+ strcat(alias, ",*");
+ return 1;
+}
+
/* Ignore any prefix, eg. some architectures prepend _ */
static inline int sym_is(const char *symbol, const char *name)
{
@@ -1047,6 +1070,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
do_table(symval, sym->st_size,
sizeof(struct isapnp_device_id), "isa",
do_isapnp_entry, mod);
+ else if (sym_is(symname, "__mod_x86cpu_device_table"))
+ do_table(symval, sym->st_size,
+ sizeof(struct x86_cpu_id), "x86cpu",
+ do_x86cpu_entry, mod);
free(zeros);
}

--
1.7.7.4


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