https://listas.upv.es/pipermail/rtlinuxgpl/2007-April/000609.html[Rtlinuxgpl] Latency Problem - seems to be because of SMIJohann Horvat johann at dunull.orgSat Apr 21 16:25:51 CEST 2007
Dear Georg, Thank you for your quick reply, I will give the ported RTAI solution a try. What I found yesterday was: http://www.rts.uni-hannover.de/rtaddon/smictrl.tar.bz2 found at: http://www.rts.uni-hannover.de/rtaddon/ It's a program which enables one to disable the SMI by a simple smictrl -s 0 It works perfect! But as mentioned before, I will try your ported RTAI module! Thanks Johann Georg Schiesser schrieb: >> I tried to install RTLinux/GNU 3.2-rc1 onto my P4 system based on a >> Fujitsu Siemens Mainboard. Installation was no problem, but testing the >> latency with ./examples/measurements/rt_process.o gives me fatal values >> if any key is pressed, or mouse is moved while testing... (>300.000). >> >> So I tried RTAI with /usr/realtime/testsuite/kern/latency/ and: >> The same problem, same latency values... ;-) >> But I detected a smi-patch module (disables the SMI) in the RTAI >> /usr/realtime/modules. >> >> After loading it, everything works fine, latency values from 10-250, >> which would work perfect for my application >> >> Is there any possibility to do the same with RTLinux/GPL? > > just to be honest, i would like to mention that i do not have a P4 and i > do not understand your SMI problem. but i had a look at the source code > from rtai and compiled it under rtlinux. > > -- georg > > > ------------------------------------------------------------------------ > > diff -u smi-rtai/smi-module.c smi-rtl/smi-module.c > --- smi-rtai/smi-module.c 2007-04-21 07:39:58.000000000 +0200 > +++ smi-rtl/smi-module.c 2007-04-21 07:36:07.000000000 +0200 > @@ -1,6 +1,9 @@ > /* > * SMI workaround for x86. > * > + * This is the RTLinux version, which is a cut and paste from RTAI: > + * RTAI Magma base/arch/i386/calibration/smi-module.c Rev 1.8 2007-02-16 > + * > * Cut/Pasted from Vitor Angelo "smi" module. > * Adapted by Gilles Chanteperdrix <gilles.chanteperdrix at laposte.net>. > * Further adaptation by Alberto Sechi <sechi at aero.polimi.it>. > @@ -28,10 +31,8 @@ > #include <linux/pci.h> > #include <linux/pci_ids.h> > > -#include <rtai_wrappers.h> > - > int smiReset = 0; > -RTAI_MODULE_PARM(smiReset, int); > +MODULE_PARM(smiReset, "i"); > > #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) > #define pci_get_device(a, b, c) pci_find_device(a, b, c) > > > ------------------------------------------------------------------------ > > include /usr/src/rtlinux/rtl.mk > > all: smi-module.o > > smi-module.o: smi-module.c > > clean: > rm -f smi-module.o > > > ------------------------------------------------------------------------ > > /* > * SMI workaround for x86. > * > * This is the RTLinux version, which is a cut and paste from RTAI: > * RTAI Magma base/arch/i386/calibration/smi-module.c Rev 1.8 2007-02-16 > * > * Cut/Pasted from Vitor Angelo "smi" module. > * Adapted by Gilles Chanteperdrix <gilles.chanteperdrix at laposte.net>. > * Further adaptation by Alberto Sechi <sechi at aero.polimi.it>. > * > * This program is free software; you can redistribute it and/or modify > * it under the terms of the GNU General Public License as published by > * the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139, > * USA; either version 2 of the License, or (at your option) any later > * version. > * > * This program is distributed in the hope that it will be useful, > * but WITHOUT ANY WARRANTY; without even the implied warranty of > * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > * GNU General Public License for more details. > * > * You should have received a copy of the GNU General Public License > * along with this program; if not, write to the Free Software > * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. > */ > > > #include <linux/version.h> > #include <linux/kernel.h> > #include <linux/module.h> > #include <linux/pci.h> > #include <linux/pci_ids.h> > > int smiReset = 0; > MODULE_PARM(smiReset, "i"); > > #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) > #define pci_get_device(a, b, c) pci_find_device(a, b, c) > #define pci_dev_put(a) do { /*nothing*/ } while(0) > #endif > > /* set these as you need */ > #define CONFIG_RTAI_HW_SMI_ALL 0 > #define CONFIG_RTAI_HW_SMI_INTEL_USB2 0 > #define CONFIG_RTAI_HW_SMI_LEGACY_USB2 0 > #define CONFIG_RTAI_HW_SMI_PERIODIC 0 > #define CONFIG_RTAI_HW_SMI_TCO 0 > #define CONFIG_RTAI_HW_SMI_MC 0 > #define CONFIG_RTAI_HW_SMI_APMC 0 > #define CONFIG_RTAI_HW_SMI_LEGACY_USB 0 > #define CONFIG_RTAI_HW_SMI_BIOS 0 > > #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,11) > #ifndef PCI_DEVICE_ID_INTEL_ICH7_0 > #define PCI_DEVICE_ID_INTEL_ICH7_0 0x27b8 > #define PCI_DEVICE_ID_INTEL_ICH7_1 0x27b9 > #endif > #endif > > > static struct pci_device_id hal_smi_pci_tbl[] = { > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0) }, > { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1) }, > { 0, }, > }; > > /* FIXME: Probably crippled too, need to be checked : > > 0x24dc 82801EB (ICH5) LPC Interface Bridge (not a real ID, but exists in the > pci.ids database, ICH5-M ?) > { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12, PCI_ANY_ID, PCI_ANY_ID, }, > > */ > > #define DEVFN 0xf8 /* device 31, function 0 */ > > #define PMBASE_B0 0x40 > #define PMBASE_B1 0x41 > > #define SMI_CTRL_ADDR 0x30 > #define SMI_STATUS_ADDR 0x34 > #define SMI_MON_ADDR 0x40 > > /* SMI_EN register: ICH[0](16 bits), ICH[2-5](32 bits) */ > #define INTEL_USB2_EN_BIT (0x01 << 18) /* ICH4, ... */ > #define LEGACY_USB2_EN_BIT (0x01 << 17) /* ICH4, ... */ > #define PERIODIC_EN_BIT (0x01 << 14) /* called 1MIN_ in ICH0 */ > #define TCO_EN_BIT (0x01 << 13) > #define MCSMI_EN_BIT (0x01 << 11) > #define SWSMI_TMR_EN_BIT (0x01 << 6) > #define APMC_EN_BIT (0x01 << 5) > #define SLP_EN_BIT (0x01 << 4) > #define LEGACY_USB_EN_BIT (0x01 << 3) > #define BIOS_EN_BIT (0x01 << 2) > #define GBL_SMI_EN_BIT (0x01) /* This is reset by a PCI reset event! */ > > static const unsigned hal_smi_masked_bits = 0 > #if CONFIG_RTAI_HW_SMI_ALL > | GBL_SMI_EN_BIT > #else > #if CONFIG_RTAI_HW_SMI_INTEL_USB2 > | INTEL_USB2_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_LEGACY_USB2 > | LEGACY_USB2_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_PERIODIC > | PERIODIC_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_TCO > | TCO_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_MC > | MCSMI_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_APMC > | APMC_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_LEGACY_USB > | LEGACY_USB_EN_BIT > #endif > #if CONFIG_RTAI_HW_SMI_BIOS > | BIOS_EN_BIT > #endif > #endif > ; > > static unsigned hal_smi_saved_bits; > static unsigned short hal_smi_en_addr; > static struct pci_dev *smi_dev; > > #define mask_bits(v, p) outl(inl(p) & ~(v), (p)) > #define set_bits(v, p) outl(inl(p) | (v), (p)) > > void hal_smi_restore(void) > { > if (hal_smi_en_addr) { > set_bits(hal_smi_saved_bits, hal_smi_en_addr); > pci_dev_put(smi_dev); > } > } > > void hal_smi_disable(void) > { > if (hal_smi_en_addr) { > hal_smi_saved_bits = inl(hal_smi_en_addr) & hal_smi_masked_bits; > mask_bits(hal_smi_masked_bits, hal_smi_en_addr); > } > } > > static unsigned short __devinit get_smi_en_addr(struct pci_dev *dev) > { > u_int8_t byte0, byte1; > > pci_read_config_byte (dev, PMBASE_B0, &byte0); > pci_read_config_byte (dev, PMBASE_B1, &byte1); > return SMI_CTRL_ADDR + (((byte1 << 1) | (byte0 >> 7)) << 7); //bits 7-15 > } > > int __devinit hal_smi_init(void) > { > struct pci_dev *dev = NULL; > struct pci_device_id *id; > > /* > * Do not use pci_register_driver, pci_enable_device, ... > * Just register the used ports. > */ > for (id = &hal_smi_pci_tbl[0]; dev == NULL && id->vendor != 0; id++) { > dev = pci_get_device(id->vendor, id->device, NULL); > } > > if (dev == NULL || dev->bus->number || dev->devfn != DEVFN) { > pci_dev_put(dev); > printk("RTAI: Intel chipset not found.\n"); > return -ENODEV; > } > > printk("RTAI: Intel chipset found, enabling SMI workaround.\n"); > hal_smi_en_addr = get_smi_en_addr(dev); > smi_dev = dev; > hal_smi_disable(); > return 0; > } > > /************************************************************************/ > > int init_module(void) > { > int retval; > if (!(retval = hal_smi_init())) { > printk("SMI module loaded\n"); > } > return retval; > } > > void cleanup_module(void) > { > if (smiReset) { > hal_smi_restore(); > printk("SMI module unloaded and reset\n"); > } else { > printk("SMI module unloaded but not reset\n"); > } > } > > MODULE_LICENSE("GPL"); > > /**************************************************************************/ > /* > > FIXME: there are many more SMI sources than those of the SMI_EN > register. From http://www.intel.com/design/chipsets/datashts/252516.htm > there are at least the following other sources : > > pages 377, 386, 388, 389; Power management > register GEN_PMCON1, bit SMI_LOCK, locks GLB_SMI_EN > bits PER_SMI_SEL, allow selection of the periodic SMI > registers PM1_STS, PM1_EN, PM1_CNT bit SCI_EN, if cleared generates SMI > for power management events. > > pages 173, 381, 400; GPIOs > register GPI[0-15]_ROUT allow routing each GPIO to SMI or SCI > register ALT_GP_SMI_EN, ALT_GP_SMI_STS, allow masking SMIs for GPIOs > > pages 184, 188, 402; legacy devices emulation (ATA, floppy, parallel, UARTs, > keyboard). I/O to specified ports may cause events, which can generate an > SMI, depending on registers configuration : > register DEVTRAP_EN, DEVTRAP_STS > BIG FAT WARNING : globally disabling SMI on a box with SATA disks and > SATA controller in "legacy" mode, probably prevents disks from > working. > > pages 382, 383, 400; Monitors ? > seem to be a generic legacy device emulation (like previous), registers > MON[4-7]_FWD_EN, enables forwarding of I/O to LPC > MON[4-7]_TRP_RNG, address of the emulated devices > MON[4-7]_TRP_MSK and MON_SMI (registers MON[4-7]_TRAP_EN and > MON[4-7]_TRAP_STS) > > page 407: TCO > register TCO1_CNT, bit NMI2SMI_EN, enables TCO to use SMI instead of NMI, > bit TCO_TMR_HLT, should be cleared to avoid being rebooted when the TCO > timer expires. Dangerous bit: TCO_LOCK locks the TCO timer until reboot. > register used by Linux drivers/char/watchdog/i8xx_tco.c > > page 492, 493: USB EHCI legacy support and SPECIAL SMI, i.e Intel Specific > USB 2.0 SMI register. > > page 520, SMBus > may be disabled by clearing register HOSTC, bit SMB_SMI_EN > register used by Linux driver drivers/i2c/busses/i2c-i801.c > > */ -- --------------------------- Johann Horvat Hasnerstrasse 124b/1816 1160 Vienna Austria http://www.dunull.org phone: +43-664-504 56 26 bank account: Bank: BA-CA no: 12020893900 BLZ: 12000 IBAN: AT49 1100 0120 2089 3900 BIC: BKAUATWW
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