*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
- * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
+ * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>
* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
* - Added processor hotplug support
* Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
#include <linux/dmi.h>
#include <linux/moduleparam.h>
#include <linux/sched.h> /* need_resched() */
+#include <linux/latency.h>
#include <asm/io.h>
#include <asm/uaccess.h>
/* Actually this shouldn't be __cpuinitdata, would be better to fix the
callers to only run once -AK */
static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
+ { set_max_cstate, "IBM ThinkPad R40e", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1},
{ set_max_cstate, "IBM ThinkPad R40e", {
DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1},
u32 bm_status = 0;
unsigned long diff = jiffies - pr->power.bm_check_timestamp;
- if (diff > 32)
- diff = 32;
+ if (diff > 31)
+ diff = 31;
- while (diff) {
- /* if we didn't get called, assume there was busmaster activity */
- diff--;
- if (diff)
- pr->power.bm_activity |= 0x1;
- pr->power.bm_activity <<= 1;
- }
+ pr->power.bm_activity <<= diff;
acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS,
&bm_status, ACPI_MTX_DO_NOT_LOCK);
if (bm_status) {
- pr->power.bm_activity++;
+ pr->power.bm_activity |= 0x1;
acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS,
1, ACPI_MTX_DO_NOT_LOCK);
}
else if (errata.piix4.bmisx) {
if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
|| (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
- pr->power.bm_activity++;
+ pr->power.bm_activity |= 0x1;
}
pr->power.bm_check_timestamp = jiffies;
/*
- * Apply bus mastering demotion policy. Automatically demote
+ * If bus mastering is or was active this jiffy, demote
* to avoid a faulty transition. Note that the processor
* won't enter a low-power state during this call (to this
- * funciton) but should upon the next.
+ * function) but should upon the next.
*
* TBD: A better policy might be to fallback to the demotion
* state (use it for this quantum only) istead of
* qualification. This may, however, introduce DMA
* issues (e.g. floppy DMA transfer overrun/underrun).
*/
- if (pr->power.bm_activity & cx->demotion.threshold.bm) {
+ if ((pr->power.bm_activity & 0x1) &&
+ cx->demotion.threshold.bm) {
local_irq_enable();
next_state = cx->demotion.state;
goto end;
cx = &pr->power.states[ACPI_STATE_C1];
#endif
- cx->usage++;
-
/*
* Sleep:
* ------
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C2 */
inb(cx->address);
- /* Dummy op - must do something useless after P_LVL2 read */
+ /* Dummy wait op - must do something useless after P_LVL2 read
+ because chipsets cannot guarantee that STPCLK# signal
+ gets asserted in time to freeze execution properly. */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
+
+#ifdef CONFIG_GENERIC_TIME
+ /* TSC halts in C2, so notify users */
+ mark_tsc_unstable();
+#endif
/* Re-enable interrupts */
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C3 */
inb(cx->address);
- /* Dummy op - must do something useless after P_LVL3 read */
+ /* Dummy wait op (see above) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
ACPI_MTX_DO_NOT_LOCK);
}
+#ifdef CONFIG_GENERIC_TIME
+ /* TSC halts in C3, so notify users */
+ mark_tsc_unstable();
+#endif
/* Re-enable interrupts */
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
local_irq_enable();
return;
}
+ cx->usage++;
+ if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
+ cx->time += sleep_ticks;
next_state = pr->power.state;
*/
if (cx->promotion.state &&
((cx->promotion.state - pr->power.states) <= max_cstate)) {
- if (sleep_ticks > cx->promotion.threshold.ticks) {
+ if (sleep_ticks > cx->promotion.threshold.ticks &&
+ cx->promotion.state->latency <= system_latency_constraint()) {
cx->promotion.count++;
cx->demotion.count = 0;
if (cx->promotion.count >=
end:
/*
* Demote if current state exceeds max_cstate
+ * or if the latency of the current state is unacceptable
*/
- if ((pr->power.state - pr->power.states) > max_cstate) {
+ if ((pr->power.state - pr->power.states) > max_cstate ||
+ pr->power.state->latency > system_latency_constraint()) {
if (cx->demotion.state)
next_state = cx->demotion.state;
}
struct acpi_processor_cx *higher = NULL;
struct acpi_processor_cx *cx;
- ACPI_FUNCTION_TRACE("acpi_processor_set_power_policy");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
/*
* This function sets the default Cx state policy (OS idle handler).
}
if (!state_is_set)
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* demotion */
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
higher = cx;
}
- return_VALUE(0);
+ return 0;
}
static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
{
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_fadt");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
if (!pr->pblk)
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* if info is obtained from pblk/fadt, type equals state */
pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
* an SMP system.
*/
if ((num_online_cpus() > 1) && !acpi_fadt.plvl2_up)
- return_VALUE(-ENODEV);
+ return -ENODEV;
#endif
/* determine C2 and C3 address from pblk */
pr->power.states[ACPI_STATE_C2].address,
pr->power.states[ACPI_STATE_C3].address));
- return_VALUE(0);
+ return 0;
}
static int acpi_processor_get_power_info_default_c1(struct acpi_processor *pr)
{
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1");
/* Zero initialize all the C-states info. */
memset(pr->power.states, 0, sizeof(pr->power.states));
pr->power.states[ACPI_STATE_C0].valid = 1;
pr->power.states[ACPI_STATE_C1].valid = 1;
- return_VALUE(0);
+ return 0;
}
static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *cst;
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst");
if (nocst)
- return_VALUE(-ENODEV);
+ return -ENODEV;
current_count = 1;
status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
- return_VALUE(-ENODEV);
+ return -ENODEV;
}
- cst = (union acpi_object *)buffer.pointer;
+ cst = buffer.pointer;
/* There must be at least 2 elements */
if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "not enough elements in _CST\n"));
+ printk(KERN_ERR PREFIX "not enough elements in _CST\n");
status = -EFAULT;
goto end;
}
/* Validate number of power states. */
if (count < 1 || count != cst->package.count - 1) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "count given by _CST is not valid\n"));
+ printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
status = -EFAULT;
goto end;
}
memset(&cx, 0, sizeof(cx));
- element = (union acpi_object *)&(cst->package.elements[i]);
+ element = &(cst->package.elements[i]);
if (element->type != ACPI_TYPE_PACKAGE)
continue;
if (element->package.count != 4)
continue;
- obj = (union acpi_object *)&(element->package.elements[0]);
+ obj = &(element->package.elements[0]);
if (obj->type != ACPI_TYPE_BUFFER)
continue;
0 : reg->address;
/* There should be an easy way to extract an integer... */
- obj = (union acpi_object *)&(element->package.elements[1]);
+ obj = &(element->package.elements[1]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
if ((cx.type < ACPI_STATE_C2) || (cx.type > ACPI_STATE_C3))
continue;
- obj = (union acpi_object *)&(element->package.elements[2]);
+ obj = &(element->package.elements[2]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
cx.latency = obj->integer.value;
- obj = (union acpi_object *)&(element->package.elements[3]);
+ obj = &(element->package.elements[3]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
status = -EFAULT;
end:
- acpi_os_free(buffer.pointer);
+ kfree(buffer.pointer);
- return_VALUE(status);
+ return status;
}
static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
{
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c2");
if (!cx->address)
- return_VOID;
+ return;
/*
* C2 latency must be less than or equal to 100
else if (cx->latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"latency too large [%d]\n", cx->latency));
- return_VOID;
+ return;
}
/*
cx->valid = 1;
cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
- return_VOID;
+ return;
}
static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
{
static int bm_check_flag;
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3");
if (!cx->address)
- return_VOID;
+ return;
/*
* C3 latency must be less than or equal to 1000
else if (cx->latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"latency too large [%d]\n", cx->latency));
- return_VOID;
+ return;
}
/*
else if (errata.piix4.fdma) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"C3 not supported on PIIX4 with Type-F DMA\n"));
- return_VOID;
+ return;
}
/* All the logic here assumes flags.bm_check is same across all CPUs */
if (!pr->flags.bm_control) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"C3 support requires bus mastering control\n"));
- return_VOID;
+ return;
}
} else {
/*
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Cache invalidation should work properly"
" for C3 to be enabled on SMP systems\n"));
- return_VOID;
+ return;
}
acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD,
0, ACPI_MTX_DO_NOT_LOCK);
cx->valid = 1;
cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
- return_VOID;
+ return;
}
static int acpi_processor_power_verify(struct acpi_processor *pr)
unsigned int i;
int result;
- ACPI_FUNCTION_TRACE("acpi_processor_get_power_info");
/* NOTE: the idle thread may not be running while calling
* this function */
*/
result = acpi_processor_set_power_policy(pr);
if (result)
- return_VALUE(result);
+ return result;
/*
* if one state of type C2 or C3 is available, mark this
}
}
- return_VALUE(0);
+ return 0;
}
int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
int result = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_cst_has_changed");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
if (nocst) {
- return_VALUE(-ENODEV);
+ return -ENODEV;
}
if (!pr->flags.power_setup_done)
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* Fall back to the default idle loop */
pm_idle = pm_idle_save;
if ((pr->flags.power == 1) && (pr->flags.power_setup_done))
pm_idle = acpi_processor_idle;
- return_VALUE(result);
+ return result;
}
/* proc interface */
static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
{
- struct acpi_processor *pr = (struct acpi_processor *)seq->private;
+ struct acpi_processor *pr = seq->private;
unsigned int i;
- ACPI_FUNCTION_TRACE("acpi_processor_power_seq_show");
if (!pr)
goto end;
seq_printf(seq, "active state: C%zd\n"
"max_cstate: C%d\n"
- "bus master activity: %08x\n",
+ "bus master activity: %08x\n"
+ "maximum allowed latency: %d usec\n",
pr->power.state ? pr->power.state - pr->power.states : 0,
- max_cstate, (unsigned)pr->power.bm_activity);
+ max_cstate, (unsigned)pr->power.bm_activity,
+ system_latency_constraint());
seq_puts(seq, "states:\n");
else
seq_puts(seq, "demotion[--] ");
- seq_printf(seq, "latency[%03d] usage[%08d]\n",
+ seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
pr->power.states[i].latency,
- pr->power.states[i].usage);
+ pr->power.states[i].usage,
+ pr->power.states[i].time);
}
end:
- return_VALUE(0);
+ return 0;
}
static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
PDE(inode)->data);
}
-static struct file_operations acpi_processor_power_fops = {
+static const struct file_operations acpi_processor_power_fops = {
.open = acpi_processor_power_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
+static void smp_callback(void *v)
+{
+ /* we already woke the CPU up, nothing more to do */
+}
+
+/*
+ * This function gets called when a part of the kernel has a new latency
+ * requirement. This means we need to get all processors out of their C-state,
+ * and then recalculate a new suitable C-state. Just do a cross-cpu IPI; that
+ * wakes them all right up.
+ */
+static int acpi_processor_latency_notify(struct notifier_block *b,
+ unsigned long l, void *v)
+{
+ smp_call_function(smp_callback, NULL, 0, 1);
+ return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_processor_latency_notifier = {
+ .notifier_call = acpi_processor_latency_notify,
+};
+
int acpi_processor_power_init(struct acpi_processor *pr,
struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
unsigned int i;
- ACPI_FUNCTION_TRACE("acpi_processor_power_init");
if (!first_run) {
dmi_check_system(processor_power_dmi_table);
"ACPI: processor limited to max C-state %d\n",
max_cstate);
first_run++;
+ register_latency_notifier(&acpi_processor_latency_notifier);
}
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
if (acpi_fadt.cst_cnt && !nocst) {
status =
acpi_os_write_port(acpi_fadt.smi_cmd, acpi_fadt.cst_cnt, 8);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Notifying BIOS of _CST ability failed\n"));
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Notifying BIOS of _CST ability failed"));
}
}
entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER,
S_IRUGO, acpi_device_dir(device));
if (!entry)
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to create '%s' fs entry\n",
- ACPI_PROCESSOR_FILE_POWER));
+ return -EIO;
else {
entry->proc_fops = &acpi_processor_power_fops;
entry->data = acpi_driver_data(device);
pr->flags.power_setup_done = 1;
- return_VALUE(0);
+ return 0;
}
int acpi_processor_power_exit(struct acpi_processor *pr,
struct acpi_device *device)
{
- ACPI_FUNCTION_TRACE("acpi_processor_power_exit");
pr->flags.power_setup_done = 0;
* copies of pm_idle before proceeding.
*/
cpu_idle_wait();
+ unregister_latency_notifier(&acpi_processor_latency_notifier);
}
- return_VALUE(0);
+ return 0;
}
projects / powerpc.git / blobdiff