Date: Wed, 26 Dec 2012 02:10:47 +0800 From: Jia-Shiun Li <jiashiun@gmail.com> To: Alexander Best <arundel@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: cpufreq not working as module on i386/amd64 Message-ID: <CAHNYxxPZMUMDMBo0tRSSjJZWqDD7BNR7BdadcVfZk5nDHS2c1A@mail.gmail.com> In-Reply-To: <20110129084125.GA54969@freebsd.org> References: <AANLkTi=Ln7f9tWt=OqZa9eZ-ZAVBfQSC-y_=8c-6zwAd@mail.gmail.com> <20110129084125.GA54969@freebsd.org>
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I was cleaning up hard drive and found these old logs. Anyway I added some printf() and saw the process failed at device_find_child(..., "acpi_perf", ...) of est_acpi_info() i.e. it cannot find acpi_perf device. devinfo did confirmed the absence of acpi_perf. Comparing the dmesgs revealed the main difference: IST (i-state?) OEM tables in SSDT seems not loaded if cpufreq was not compiled into kernel, as it shows below. Before I diving into the ACPI part, can anyone familiar with how ACPI works shed me some light? ----->8----->8----->8----- % diff -bu cpufreq-nb.log cpufreq-no.log ... @@ -158,17 +158,11 @@ acpi0: Power Button (fixed) cpu0: Processor \\_PR_.CPU0 (ACPI ID 1) -> APIC ID 0 cpu0: <ACPI CPU> on acpi0 -ACPI: SSDT 0xbfd8dc98 00223 (v01 PmRef Cpu0Ist 00003000 INTL 20051117) -ACPI: Dynamic OEM Table Load: -ACPI: SSDT 0 00223 (v01 PmRef Cpu0Ist 00003000 INTL 20051117) ACPI: SSDT 0xbfd8b598 00537 (v01 PmRef Cpu0Cst 00003001 INTL 20051117) ACPI: Dynamic OEM Table Load: ACPI: SSDT 0 00537 (v01 PmRef Cpu0Cst 00003001 INTL 20051117) cpu1: Processor \\_PR_.CPU1 (ACPI ID 2) -> APIC ID 1 cpu1: <ACPI CPU> on acpi0 -ACPI: SSDT 0xbfd8ce18 001CF (v01 PmRef ApIst 00003000 INTL 20051117) -ACPI: Dynamic OEM Table Load: -ACPI: SSDT 0 001CF (v01 PmRef ApIst 00003000 INTL 20051117) ACPI: SSDT 0xbfd8df18 0008D (v01 PmRef ApCst 00003000 INTL 20051117) ACPI: Dynamic OEM Table Load: ACPI: SSDT 0 0008D (v01 PmRef ApCst 00003000 INTL 20051117 On Sat, Jan 29, 2011 at 4:41 PM, Alexander Best <arundel@freebsd.org> wrote: > On Sat Jan 29 11, Jia-Shiun Li wrote: >> Hi all, >> >> I found that cpufreq driver failed to attach when compiled as module >> and loaded, but it works fine when compiled into kernel. I am >> wondering if this is due to some kind of limitation, or can be fixed? > > that's rather odd. for me neither the module nor the kernel code works, since > my cpu isn't supported by sys/x86/cpufreq/est.c. actually only pentium mobile > cpus seem to be supported. > > maybe you can add some printf's to est.c:est_get_info() to identify at which > point error gets set. also you might want to make > > "est: cpu_vendor %s, msr %0jx\n", cpu_vendor, msr); > > non-conditional. maybe the output differy in kernel/module mode. > > cheers. > alex > >> >> Tested on a Pentium E5200 desktop (i386) and a Pentium T4200 laptop >> (amd64). Both got the same result. dmesg of T4200 attached. >> >> kldload module: >> ----->8----->8----->8----- >> est0: <Enhanced SpeedStep Frequency Control> on cpu0 >> est: CPU supports Enhanced Speedstep, but is not recognized. >> est: cpu_vendor GenuineIntel, msr 6194c1a06004c1a >> device_attach: est0 attach returned 6 >> est1: <Enhanced SpeedStep Frequency Control> on cpu1 >> est: CPU supports Enhanced Speedstep, but is not recognized. >> est: cpu_vendor GenuineIntel, msr 6194c1a06004c1a >> -----8<-----8<-----8<----- >> (repeated 6 times, kldload retries?) >> >> compiled into kernel: >> ----->8----->8----->8----- >> ... >> fdc0 failed to probe at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0 >> uart1: <ns8250> failed to probe at port 0x2f8-0x2ff irq 3 on isa0 >> isa_probe_children: probing PnP devices >> coretemp0: <CPU On-Die Thermal Sensors> on cpu0 >> coretemp0: Setting TjMax=104 >> p4tcc0: <CPU Frequency Thermal Control> on cpu0 >> est0: <Enhanced SpeedStep Frequency Control> on cpu0 >> coretemp1: <CPU On-Die Thermal Sensors> on cpu1 >> coretemp1: Setting TjMax=104 >> p4tcc1: <CPU Frequency Thermal Control> on cpu1 >> est1: <Enhanced SpeedStep Frequency Control> on cpu1 >> Device configuration finished. >> procfs registered >> ... >> -----8<-----8<-----8<----- >> >> Jia-Shiun. > > > -- > a13x
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