The patch titled drivers/hwmon/coretemp.c: get TjMax value from MSR has been added to the -mm tree. Its filename is drivers-hwmon-coretempc-get-tjmax-value-from-msr.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: drivers/hwmon/coretemp.c: get TjMax value from MSR From: Carsten Emde <C.Emde@xxxxxxxxx> The MSR IA32_TEMPERATURE_TARGET contains the TjMax value in the newer Intel processors. Signed-off-by: Huaxu Wan <huaxu.wan@xxxxxxxxxxxxxxx> Signed-off-by: Carsten Emde <C.Emde@xxxxxxxxx> Cc: Jean Delvare <khali@xxxxxxxxxxxx> Cc: Valdis Kletnieks <valdis.kletnieks@xxxxxx> Cc: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx> Cc: Yong Wang <yong.y.wang@xxxxxxxxxxxxxxx> Cc: Rudolf Marek <r.marek@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/x86/include/asm/msr-index.h | 2 drivers/hwmon/coretemp.c | 61 +++++++++++++++++++++++++++-- 2 files changed, 59 insertions(+), 4 deletions(-) diff -puN arch/x86/include/asm/msr-index.h~drivers-hwmon-coretempc-get-tjmax-value-from-msr arch/x86/include/asm/msr-index.h --- a/arch/x86/include/asm/msr-index.h~drivers-hwmon-coretempc-get-tjmax-value-from-msr +++ a/arch/x86/include/asm/msr-index.h @@ -236,6 +236,8 @@ #define MSR_IA32_MISC_ENABLE 0x000001a0 +#define MSR_IA32_TEMPERATURE_TARGET 0x000001a2 + /* MISC_ENABLE bits: architectural */ #define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << 0) #define MSR_IA32_MISC_ENABLE_TCC (1ULL << 1) diff -puN drivers/hwmon/coretemp.c~drivers-hwmon-coretempc-get-tjmax-value-from-msr drivers/hwmon/coretemp.c --- a/drivers/hwmon/coretemp.c~drivers-hwmon-coretempc-get-tjmax-value-from-msr +++ a/drivers/hwmon/coretemp.c @@ -241,6 +241,55 @@ static int __devinit adjust_tjmax(struct return tjmax; } +static int __devinit get_tjmax(struct cpuinfo_x86 *c, u32 id, + struct device *dev) +{ + /* The 100C is default for both mobile and non mobile CPUs */ + int err; + u32 eax, edx; + u32 val; + + /* A new feature of current Intel(R) processors, the + IA32_TEMPERATURE_TARGET contains the TjMax value */ + err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); + if (err) { + dev_warn(dev, "Unable to read TjMax from CPU.\n"); + } else { + val = (eax >> 16) & 0xff; + /* + * If the TjMax is not plausible, an assumption + * will be used + */ + if ((val > 80) && (val < 120)) { + dev_info(dev, "TjMax is %d C.\n", val); + return val * 1000; + } + } + + /* + * An assumption is made for early CPUs and unreadable MSR. + * NOTE: the given value may not be correct. + */ + + switch (c->x86_model) { + case 0xe: + case 0xf: + case 0x16: + case 0x1a: + dev_warn(dev, "TjMax is assumed as 100 C!\n"); + return 100000; + break; + case 0x17: + case 0x1c: /* Atom CPUs */ + return adjust_tjmax(c, id, dev); + break; + default: + dev_warn(dev, "CPU (model=0x%x) is not supported yet," + " using default TjMax of 100C.\n", c->x86_model); + return 100000; + } +} + static int __devinit coretemp_probe(struct platform_device *pdev) { struct coretemp_data *data; @@ -283,14 +332,18 @@ static int __devinit coretemp_probe(stru } } - data->tjmax = adjust_tjmax(c, data->id, &pdev->dev); + data->tjmax = get_tjmax(c, data->id, &pdev->dev); platform_set_drvdata(pdev, data); - /* read the still undocumented IA32_TEMPERATURE_TARGET it exists - on older CPUs but not in this register, Atoms don't have it either */ + /* + * read the still undocumented IA32_TEMPERATURE_TARGET. It exists + * on older CPUs but not in this register, + * Atoms don't have it either. + */ if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) { - err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx); + err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET, + &eax, &edx); if (err) { dev_warn(&pdev->dev, "Unable to read" " IA32_TEMPERATURE_TARGET MSR\n"); _ Patches currently in -mm which might be from C.Emde@xxxxxxxxx are linux-next.patch drivers-hwmon-coretempc-detect-the-thermal-sensors-by-cpuid.patch drivers-hwmon-coretempc-get-tjmax-value-from-msr.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html