Here is simplier patch using PCI bus master disabling code by Dave Jones.
Still using block subsystem, but this time it isn't exported to modules.
1. Call suspend(PMSG_FREEZE) for each block device.
2. Change frequency - notice that in this patch at least we give a chance to BCR2 MSR CPU's.
3. Call resume() for each block device.
Tested on Epia M10000. 22MB/s while changing from 997MHz to 532MHz at 1s interval.
EXPERIMENTAL - Please!
(HZ_100 || HZ_250) - because VIA CPU's with BCR2 MSR need >=1ms to sync PLL.
!SMP - original code and patch aren't SMP compatible.
!X86_UP_APIC - original code and patch aren't APIC compatible.
diff -uprN -X linux-2.6.16.18-vanilla/Documentation/dontdiff linux-2.6.16.18-vanilla/arch/i386/kernel/cpu/cpufreq/Kconfig linux-2.6.16.18/arch/i386/kernel/cpu/cpufreq/Kconfig
--- linux-2.6.16.18-vanilla/arch/i386/kernel/cpu/cpufreq/Kconfig 2006-05-28 15:04:34.000000000 +0200
+++ linux-2.6.16.18/arch/i386/kernel/cpu/cpufreq/Kconfig 2006-05-28 15:36:54.000000000 +0200
@@ -201,14 +201,17 @@ config X86_LONGRUN
If in doubt, say N.
config X86_LONGHAUL
- tristate "VIA Cyrix III Longhaul"
+ bool "VIA Cyrix III Longhaul (EXPERIMENTAL)"
+ default n
select CPU_FREQ_TABLE
- depends on BROKEN
+ depends on EXPERIMENTAL && !SMP && !X86_UP_APIC
+ depends on (HZ_100 || HZ_250) && (PREEMPT_NONE || PREEMPT_VOLUNTARY)
help
This adds the CPUFreq driver for VIA Samuel/CyrixIII,
VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
processors.
+ BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous*
For details, take a look at <file:Documentation/cpu-freq/>.
If in doubt, say N.
diff -uprN -X linux-2.6.16.18-vanilla/Documentation/dontdiff linux-2.6.16.18-vanilla/arch/i386/kernel/cpu/cpufreq/longhaul.c linux-2.6.16.18/arch/i386/kernel/cpu/cpufreq/longhaul.c
--- linux-2.6.16.18-vanilla/arch/i386/kernel/cpu/cpufreq/longhaul.c 2006-03-20 06:53:29.000000000 +0100
+++ linux-2.6.16.18/arch/i386/kernel/cpu/cpufreq/longhaul.c 2006-05-28 15:57:58.000000000 +0200
@@ -30,6 +30,11 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/pci.h>
+#include <linux/pm.h>
+#include <linux/kobject.h>
+#include <linux/sysdev.h>
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
#include <asm/msr.h>
#include <asm/timex.h>
@@ -115,36 +120,40 @@ static int longhaul_get_cpu_mult(void)
}
-static void do_powersaver(union msr_longhaul *longhaul,
- unsigned int clock_ratio_index)
-{
- struct pci_dev *dev;
- unsigned long flags;
- unsigned int tmp_mask;
- int version;
- int i;
- u16 pci_cmd;
- u16 cmd_state[64];
+extern struct subsystem block_subsys;
+extern struct semaphore block_subsys_sem;
- switch (cpu_model) {
- case CPU_EZRA_T:
- version = 3;
- break;
- case CPU_NEHEMIAH:
- version = 0xf;
- break;
- default:
- return;
+static struct pm_message pmsg_freeze = { .event = PM_EVENT_FREEZE, };
+
+void block_freeze_resume(int freeze)
+{
+ struct gendisk *disk;
+ struct list_head *p;
+ struct bus_type *bus;
+
+ list_for_each(p, &block_subsys.kset.list) {
+ disk = list_entry(p, struct gendisk, kobj.entry);
+ if (disk->driverfs_dev && disk->driverfs_dev->bus) {
+ bus = disk->driverfs_dev->bus;
+ if (bus->suspend && freeze) {
+ printk(KERN_INFO PFX "%.32s (%.32s) -> suspend(PMSG_FREEZE)\n", &disk->disk_name[0], &disk->driverfs_dev->bus_id[0]);
+ bus->suspend(disk->driverfs_dev, pmsg_freeze);
+ } else if (bus->resume && !freeze) {
+ printk(KERN_INFO PFX "%.32s (%.32s) -> resume()\n", &disk->disk_name[0], &disk->driverfs_dev->bus_id[0]);
+ bus->resume(disk->driverfs_dev);
+ }
+ }
}
+}
- rdmsrl(MSR_VIA_LONGHAUL, longhaul->val);
- longhaul->bits.SoftBusRatio = clock_ratio_index & 0xf;
- longhaul->bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
- longhaul->bits.EnableSoftBusRatio = 1;
- longhaul->bits.RevisionKey = 0;
- preempt_disable();
- local_irq_save(flags);
+static u16 cmd_state[64];
+
+static void clear_bus_master(void)
+{
+ struct pci_dev *dev;
+ u16 pci_cmd;
+ int i;
/*
* get current pci bus master state for all devices
@@ -161,18 +170,14 @@ static void do_powersaver(union msr_long
pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
}
} while (dev != NULL);
+}
- tmp_mask=inb(0x21); /* works on C3. save mask. */
- outb(0xFE,0x21); /* TMR0 only */
- outb(0xFF,0x80); /* delay */
-
- safe_halt();
- wrmsrl(MSR_VIA_LONGHAUL, longhaul->val);
- halt();
-
- local_irq_disable();
- outb(tmp_mask,0x21); /* restore mask */
+static void restore_bus_master(void)
+{
+ struct pci_dev *dev;
+ u16 pci_cmd;
+ int i;
/* restore pci bus master state for all devices */
dev = NULL;
@@ -184,14 +189,106 @@ static void do_powersaver(union msr_long
pci_write_config_byte(dev, PCI_COMMAND, pci_cmd);
}
} while (dev != NULL);
+}
+
+
+static void do_longhaul1(int reserved, unsigned int clock_ratio_index)
+{
+ unsigned long flags;
+ unsigned int tmp_mask;
+ union msr_bcr2 bcr2;
+
+ down(&block_subsys_sem);
+ block_freeze_resume(1);
+ preempt_disable();
+ clear_bus_master();
+ local_irq_save(flags);
+
+ local_irq_disable();
+
+ tmp_mask=inb(0x21); /* works on C3. save mask. */
+ outb(0xFE, 0x21); /* TMR0 only */
+
+ rdmsrl(MSR_VIA_BCR2, bcr2.val);
+ /* Enable software clock multiplier */
+ bcr2.bits.ESOFTBF = 1;
+ bcr2.bits.CLOCKMUL = clock_ratio_index;
+ safe_halt(); /* Sync */
+ wrmsrl(MSR_VIA_BCR2, bcr2.val); /* Change */
+ halt();
+
+ /* Disable software clock multiplier */
+ local_irq_disable();
+ rdmsrl(MSR_VIA_BCR2, bcr2.val);
+ bcr2.bits.ESOFTBF = 0;
+ wrmsrl(MSR_VIA_BCR2, bcr2.val);
+ local_irq_enable();
+
+ outb(tmp_mask, 0x21); /* restore mask */
local_irq_restore(flags);
+ restore_bus_master();
preempt_enable();
+ block_freeze_resume(0);
+ up(&block_subsys_sem);
+}
+
+
+static void do_powersaver(union msr_longhaul *longhaul,
+ unsigned int clock_ratio_index)
+{
+ unsigned long flags;
+ unsigned int pic1_mask, pic2_mask;
+ int version;
+
+ switch (cpu_model) {
+ case CPU_EZRA_T:
+ version = 3;
+ break;
+ case CPU_NEHEMIAH:
+ version = 0xf;
+ break;
+ default:
+ return;
+ }
+
+ down(&block_subsys_sem);
+ block_freeze_resume(1);
+ preempt_disable();
+ clear_bus_master();
+ local_irq_save(flags);
+
+ local_irq_disable();
+ pic2_mask=inb(0xA1);
+ pic1_mask=inb(0x21); /* works on C3. save mask. */
+ outb(0xFF,0xA1); /* Overkill */
+ outb(0xFE,0x21); /* TMR0 only */
+
+ rdmsrl(MSR_VIA_LONGHAUL, longhaul->val);
+ longhaul->bits.SoftBusRatio = clock_ratio_index & 0xf;
+ longhaul->bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
+ longhaul->bits.EnableSoftBusRatio = 1;
+ longhaul->bits.RevisionKey = 0;
+
+ safe_halt(); /* Sync */
+ wrmsrl(MSR_VIA_LONGHAUL, longhaul->val);
+ halt();
+
+ local_irq_disable();
/* disable bus ratio bit */
rdmsrl(MSR_VIA_LONGHAUL, longhaul->val);
longhaul->bits.EnableSoftBusRatio = 0;
longhaul->bits.RevisionKey = version;
wrmsrl(MSR_VIA_LONGHAUL, longhaul->val);
+
+ outb(pic2_mask,0xA1);
+ outb(pic1_mask,0x21); /* restore mask */
+
+ local_irq_restore(flags);
+ restore_bus_master();
+ preempt_enable();
+ block_freeze_resume(0);
+ up(&block_subsys_sem);
}
/**
@@ -206,7 +303,6 @@ static void longhaul_setstate(unsigned i
int speed, mult;
struct cpufreq_freqs freqs;
union msr_longhaul longhaul;
- union msr_bcr2 bcr2;
static unsigned int old_ratio=-1;
if (old_ratio == clock_ratio_index)
@@ -241,20 +337,7 @@ static void longhaul_setstate(unsigned i
*/
case TYPE_LONGHAUL_V1:
case TYPE_LONGHAUL_V2:
- rdmsrl (MSR_VIA_BCR2, bcr2.val);
- /* Enable software clock multiplier */
- bcr2.bits.ESOFTBF = 1;
- bcr2.bits.CLOCKMUL = clock_ratio_index;
- local_irq_disable();
- wrmsrl (MSR_VIA_BCR2, bcr2.val);
- safe_halt();
-
- /* Disable software clock multiplier */
- rdmsrl (MSR_VIA_BCR2, bcr2.val);
- bcr2.bits.ESOFTBF = 0;
- local_irq_disable();
- wrmsrl (MSR_VIA_BCR2, bcr2.val);
- local_irq_enable();
+ do_longhaul1(0, clock_ratio_index);
break;
/*
diff -uprN -X linux-2.6.16.18-vanilla/Documentation/dontdiff linux-2.6.16.18-vanilla/block/genhd.c linux-2.6.16.18/block/genhd.c
--- linux-2.6.16.18-vanilla/block/genhd.c 2006-05-28 15:04:34.000000000 +0200
+++ linux-2.6.16.18/block/genhd.c 2006-05-28 15:34:31.000000000 +0200
@@ -16,9 +16,9 @@
#include <linux/kobj_map.h>
#include <linux/buffer_head.h>
-static struct subsystem block_subsys;
+struct subsystem block_subsys;
-static DECLARE_MUTEX(block_subsys_sem);
+DECLARE_MUTEX(block_subsys_sem);
/*
* Can be deleted altogether. Later.
@@ -511,8 +511,7 @@ static struct kset_uevent_ops block_ueve
};
/* declare block_subsys. */
-static decl_subsys(block, &ktype_block, &block_uevent_ops);
-
+decl_subsys(block, &ktype_block, &block_uevent_ops);
/*
* aggregate disk stat collector. Uses the same stats that the sysfs
----------------------------------------------------------------------
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