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Date: Fri, 06 Nov 2009 10:31:44 -0800
From: Mike Travis <travis@....com>
To: dimm <dmitry.adamushko@...il.com>
CC: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>,
Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
Thomas Gleixner <tglx@...utronix.de>,
Borislav Petkov <borislav.petkov@....com>,
Andreas Mohr <andi@...as.de>, Jack Steiner <steiner@....com>
Subject: Re: [ RFC, PATCH - 2/2, v2 ] x86-microcode: refactor microcode output
dimm wrote:
> [ resending ]
>
>
> 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@...il.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)
Should be 'struct cpumask *range'
cpumask_var_t is only to declare a local cpumask variable. All cpumasks are now
passed by reference (as a pointer).
With this patch the console still printed for each cpu:
[ 2.131142] mce: CPU supports 22 MCE banks
[ 2.131177] ssCC PCss ssPP ssss ssss ss
[ 2.211971] mce: CPU supports 22 MCE banks
[ 2.212005] ssCC PCss ssPP ssss ssss ss
[ 2.292800] mce: CPU supports 22 MCE banks
[ 2.292834] ssCC PCss ssPP ssss ssss ss
[ 2.375624] mce: CPU supports 22 MCE banks
[ 2.375658] ssCC PCss ssPP ssss ssss ss
[ 2.456453] mce: CPU supports 22 MCE banks
[ 2.456487] ssCC PCss ssPP ssss ssss ss
[ 2.537282] mce: CPU supports 22 MCE banks
[ 2.537316] ssCC PCss ssPP ssss ssss ss
....
> +{
> + 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(µcode_mutex);
> put_online_cpus();
>
> @@ -257,7 +334,7 @@ static int reload_for_cpu(int cpu)
>
> ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev);
> if (ustate == UCODE_OK)
> - apply_microcode_on_target(cpu);
> + apply_microcode_on_target(cpu, 1);
> mutex_unlock(µcode_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(µcode_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(µcode_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,
> };
>
>
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