[ RFC, PATCH - 2/2 ] x86-microcode: refactor microcode output messages

dimm
2009-11-01T22:25:43Z

patch-2: see the summary in the 1st message.

summarize_cpu_info() perhaps require some more polishing.

(Not-yet-)signed-off-by: Dmitry Adaushko <dmitry.adamushko@gmail.com>

diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 68fd54c..38011a3 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -26,8 +26,10 @@ struct microcode_ops {
* are being called.
* See also the "Synchronization" section in microcode_core.c.
*/
- int (*apply_microcode) (int cpu);
+ int (*apply_microcode) (int cpu, int verbose);
int (*collect_cpu_info) (int cpu, struct cpu_signature *csig);
+
+ int (*version_snprintf) (char *buf, int len, struct cpu_signature *csig);
};

struct ucode_cpu_info {
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index c205d37..0928fb3 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -81,10 +81,14 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
return -1;
}
rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
- printk(KERN_INFO "microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev);
return 0;
}

+static int version_snprintf(char *buf, int len, struct cpu_signature *csig)
+{
+ return snprintf(buf, len, "patch_level=0x%x\n", csig->rev);
+}
+
static int get_matching_microcode(int cpu, void *mc, int rev)
{
struct microcode_header_amd *mc_header = mc;
@@ -129,7 +133,7 @@ static int get_matching_microcode(int cpu, void *mc, int rev)
return 1;
}

-static int apply_microcode_amd(int cpu)
+static int apply_microcode_amd(int cpu, int verbose)
{
u32 rev, dummy;
int cpu_num = raw_smp_processor_id();
@@ -153,8 +157,8 @@ static int apply_microcode_amd(int cpu)
return -1;
}

- printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n",
- cpu, rev);
+ if (verbose)
+ printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n", cpu, rev);

return 0;
}
@@ -347,6 +351,7 @@ static struct microcode_ops microcode_amd_ops = {
.request_microcode_fw = request_microcode_fw,
.collect_cpu_info = collect_cpu_info_amd,
.apply_microcode = apply_microcode_amd,
+ .version_snprintf = version_snprintf,
.microcode_fini_cpu = microcode_fini_cpu_amd,
};

diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index b7ead3a..fb18304 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -138,20 +138,33 @@ static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
return ret;
}

+struct cpu_info_array_ctx {
+ struct cpu_signature cpu_sig;
+ int err;
+};
+
+static void collect_cpu_info_array(void *arg)
+{
+ int cpu = smp_processor_id();
+ struct cpu_info_array_ctx *ctx = arg;
+
+ ctx[cpu].err = microcode_ops->collect_cpu_info(cpu, &ctx[cpu].cpu_sig);
+}
+
struct apply_microcode_ctx {
- int err;
+ int err, verbose;
};

static void apply_microcode_local(void *arg)
{
struct apply_microcode_ctx *ctx = arg;

- ctx->err = microcode_ops->apply_microcode(smp_processor_id());
+ ctx->err = microcode_ops->apply_microcode(smp_processor_id(), ctx->verbose);
}

-static int apply_microcode_on_target(int cpu)
+static int apply_microcode_on_target(int cpu, int verbose)
{
- struct apply_microcode_ctx ctx = { .err = 0 };
+ struct apply_microcode_ctx ctx = { .err = 0, .verbose = verbose };
int ret;

ret = smp_call_function_single(cpu, apply_microcode_local, &ctx, 1);
@@ -161,6 +174,68 @@ static int apply_microcode_on_target(int cpu)
return ret;
}

+static int summarize_cpu_range(cpumask_var_t range, struct cpu_signature *csig)
+{
+ char *cpu_str, *ver_str;
+ int ret = -1;
+
+ cpu_str = kmalloc(128, GFP_KERNEL);
+ ver_str = kmalloc(128, GFP_KERNEL);
+ if (!cpu_str || !ver_str)
+ goto out;
+
+ cpulist_scnprintf(cpu_str, 128, range);
+ microcode_ops->version_snprintf(ver_str, 128, csig);
+
+ printk(KERN_INFO "microcode: CPU%s: %s\n", cpu_str, ver_str);
+ ret = 0;
+out:
+ if (cpu_str)
+ kfree(cpu_str);
+ if (ver_str)
+ kfree(ver_str);
+
+ return ret;
+}
+
+static void summarize_cpu_info(void)
+{
+ struct cpu_info_array_ctx *ctx_array;
+ cpumask_var_t cpulist;
+ int base, cpu, ret;
+
+ if (!alloc_cpumask_var(&cpulist, GFP_KERNEL))
+ return;
+
+ ctx_array = kmalloc(nr_cpu_ids * sizeof(*ctx_array), GFP_KERNEL);
+ if (!ctx_array)
+ goto out;
+
+ ret = on_each_cpu(collect_cpu_info_array, ctx_array, 1);
+ if (ret)
+ goto out;
+
+ base = cpumask_first(cpu_online_mask);
+ cpu = base;
+ cpumask_set_cpu(cpu, cpulist);
+
+ while ((cpu = cpumask_next(cpu, cpu_online_mask)) < nr_cpu_ids) {
+ if (memcmp(&ctx_array[base].cpu_sig, &ctx_array[cpu].cpu_sig,
+ sizeof(ctx_array[base].cpu_sig)) != 0) {
+ summarize_cpu_range(cpulist, &ctx_array[base].cpu_sig);
+ cpumask_clear(cpulist);
+ base = cpu;
+ }
+ cpumask_set_cpu(cpu, cpulist);
+ }
+ summarize_cpu_range(cpulist, &ctx_array[base].cpu_sig);
+
+out:
+ free_cpumask_var(cpulist);
+ if (ctx_array)
+ kfree(ctx_array);
+}
+
#ifdef CONFIG_MICROCODE_OLD_INTERFACE
static int do_microcode_update(const void __user *buf, size_t size)
{
@@ -175,7 +250,7 @@ static int do_microcode_update(const void __user *buf, size_t size)
error = -1;
break;
} else if (ustate == UCODE_OK)
- apply_microcode_on_target(cpu);
+ apply_microcode_on_target(cpu, 0);
}

return error;
@@ -203,6 +278,8 @@ static ssize_t microcode_write(struct file *file, const char __user *buf,
if (do_microcode_update(buf, len) == 0)
ret = (ssize_t)len;

+ printk(KERN_INFO "microcode: microcode versions after update...\n");
+ summarize_cpu_info();
mutex_unlock(&microcode_mutex);
put_online_cpus();

@@ -257,7 +334,7 @@ static int reload_for_cpu(int cpu)

ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev);
if (ustate == UCODE_OK)
- apply_microcode_on_target(cpu);
+ apply_microcode_on_target(cpu, 1);
mutex_unlock(&microcode_mutex);

return (ustate == UCODE_ERROR)? -EINVAL : 0;
@@ -340,12 +417,12 @@ static enum ucode_state microcode_resume_cpu(int cpu)
return UCODE_NFOUND;

pr_debug("microcode: CPU%d updated upon resume\n", cpu);
- apply_microcode_on_target(cpu);
+ apply_microcode_on_target(cpu, 1);

return UCODE_OK;
}

-static enum ucode_state microcode_init_cpu(int cpu)
+static enum ucode_state microcode_init_cpu(int cpu, int verbose)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
enum ucode_state ustate;
@@ -360,7 +437,7 @@ static enum ucode_state microcode_init_cpu(int cpu)

if (ustate == UCODE_OK) {
pr_debug("microcode: CPU%d updated upon init\n", cpu);
- apply_microcode_on_target(cpu);
+ apply_microcode_on_target(cpu, verbose);
}

return ustate;
@@ -379,7 +456,7 @@ static int mc_sysdev_add(struct sys_device *sys_dev)
if (err)
return err;

- if (microcode_init_cpu(cpu) == UCODE_ERROR)
+ if (microcode_init_cpu(cpu, 0) == UCODE_ERROR)
err = -EINVAL;

return err;
@@ -416,7 +493,7 @@ static int mc_sysdev_resume(struct sys_device *dev)
WARN_ON(cpu != 0);

if (uci->mc)
- microcode_ops->apply_microcode(cpu);
+ microcode_ops->apply_microcode(cpu, 1);

return 0;
}
@@ -440,7 +517,7 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
if (action == CPU_ONLINE_FROZEN)
microcode_resume_cpu(cpu);
else
- microcode_init_cpu(cpu);
+ microcode_init_cpu(cpu, 1);
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
pr_debug("microcode: CPU%d added\n", cpu);
@@ -491,8 +568,14 @@ static int __init microcode_init(void)
get_online_cpus();
mutex_lock(&microcode_mutex);

+ printk(KERN_INFO "microcode: original microcode versions...\n");
+ summarize_cpu_info();
+
error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);

+ printk(KERN_INFO "microcode: microcode versions after update...\n");
+ summarize_cpu_info();
+
mutex_unlock(&microcode_mutex);
put_online_cpus();

diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 6589765..96c5cf5 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -165,12 +165,14 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
/* get the current revision from MSR 0x8B */
rdmsr(MSR_IA32_UCODE_REV, val[0], csig->rev);

- printk(KERN_INFO "microcode: CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
- cpu_num, csig->sig, csig->pf, csig->rev);
-
return 0;
}

+static int version_snprintf(char *buf, int len, struct cpu_signature *csig)
+{
+ return snprintf(buf, len, "sig=0x%x, pf=0x%x, revision=0x%x\n", csig->sig, csig->pf, csig->rev);
+}
+
static inline int update_match_cpu(struct cpu_signature *csig, int sig, int pf)
{
return (!sigmatch(sig, csig->sig, pf, csig->pf)) ? 0 : 1;
@@ -297,7 +299,7 @@ get_matching_microcode(struct cpu_signature *cpu_sig, void *mc, int rev)
return 0;
}

-static int apply_microcode(int cpu)
+static int apply_microcode(int cpu, int verbose)
{
struct microcode_intel *mc_intel;
struct ucode_cpu_info *uci;
@@ -332,12 +334,14 @@ static int apply_microcode(int cpu)
cpu_num, mc_intel->hdr.rev);
return -1;
}
- printk(KERN_INFO "microcode: CPU%d updated to revision "
+
+ if (verbose)
+ printk(KERN_INFO "microcode: CPU%d updated to revision "
"0x%x, date = %04x-%02x-%02x \n",
- cpu_num, val[1],
- mc_intel->hdr.date & 0xffff,
- mc_intel->hdr.date >> 24,
- (mc_intel->hdr.date >> 16) & 0xff);
+ cpu_num, val[1],
+ mc_intel->hdr.date & 0xffff,
+ mc_intel->hdr.date >> 24,
+ (mc_intel->hdr.date >> 16) & 0xff);

return 0;
}
@@ -468,6 +472,7 @@ static struct microcode_ops microcode_intel_ops = {
.request_microcode_fw = request_microcode_fw,
.collect_cpu_info = collect_cpu_info,
.apply_microcode = apply_microcode,
+ .version_snprintf = version_snprintf,
.microcode_fini_cpu = microcode_fini_cpu,
};