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path: root/drivers/acpi/processor_idle.c
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Diffstat (limited to 'drivers/acpi/processor_idle.c')
-rw-r--r--drivers/acpi/processor_idle.c164
1 files changed, 111 insertions, 53 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index c9d671cf785..2c04740c654 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -6,6 +6,8 @@
* Copyright (C) 2004 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>
+ * - Added support for C3 on SMP
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
@@ -79,30 +81,32 @@ module_param(bm_history, uint, 0644);
*
* To skip this limit, boot/load with a large max_cstate limit.
*/
-static int no_c2c3(struct dmi_system_id *id)
+static int set_max_cstate(struct dmi_system_id *id)
{
if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
return 0;
- printk(KERN_NOTICE PREFIX "%s detected - C2,C3 disabled."
+ printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
" Override with \"processor.max_cstate=%d\"\n", id->ident,
- ACPI_PROCESSOR_MAX_POWER + 1);
+ (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
- max_cstate = 1;
+ max_cstate = (long)id->driver_data;
return 0;
}
-
-
static struct dmi_system_id __initdata processor_power_dmi_table[] = {
- { no_c2c3, "IBM ThinkPad R40e", {
+ { set_max_cstate, "IBM ThinkPad R40e", {
DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
- DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }},
- { no_c2c3, "Medion 41700", {
+ DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW") }, (void*)1},
+ { set_max_cstate, "Medion 41700", {
DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
- DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J") }},
+ DMI_MATCH(DMI_BIOS_VERSION,"R01-A1J") }, (void*)1},
+ { set_max_cstate, "Clevo 5600D", {
+ DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
+ DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307") },
+ (void*)2},
{},
};
@@ -142,7 +146,7 @@ acpi_processor_power_activate (
switch (old->type) {
case ACPI_STATE_C3:
/* Disable bus master reload */
- if (new->type != ACPI_STATE_C3)
+ if (new->type != ACPI_STATE_C3 && pr->flags.bm_check)
acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0, ACPI_MTX_DO_NOT_LOCK);
break;
}
@@ -152,7 +156,7 @@ acpi_processor_power_activate (
switch (new->type) {
case ACPI_STATE_C3:
/* Enable bus master reload */
- if (old->type != ACPI_STATE_C3)
+ if (old->type != ACPI_STATE_C3 && pr->flags.bm_check)
acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 1, ACPI_MTX_DO_NOT_LOCK);
break;
}
@@ -163,6 +167,9 @@ acpi_processor_power_activate (
}
+static atomic_t c3_cpu_count;
+
+
static void acpi_processor_idle (void)
{
struct acpi_processor *pr = NULL;
@@ -297,8 +304,22 @@ static void acpi_processor_idle (void)
break;
case ACPI_STATE_C3:
- /* Disable bus master arbitration */
- acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1, ACPI_MTX_DO_NOT_LOCK);
+
+ if (pr->flags.bm_check) {
+ if (atomic_inc_return(&c3_cpu_count) ==
+ num_online_cpus()) {
+ /*
+ * All CPUs are trying to go to C3
+ * Disable bus master arbitration
+ */
+ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1,
+ ACPI_MTX_DO_NOT_LOCK);
+ }
+ } else {
+ /* SMP with no shared cache... Invalidate cache */
+ ACPI_FLUSH_CPU_CACHE();
+ }
+
/* Get start time (ticks) */
t1 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Invoke C3 */
@@ -307,8 +328,12 @@ static void acpi_processor_idle (void)
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
/* Get end time (ticks) */
t2 = inl(acpi_fadt.xpm_tmr_blk.address);
- /* Enable bus master arbitration */
- acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK);
+ if (pr->flags.bm_check) {
+ /* Enable bus master arbitration */
+ atomic_dec(&c3_cpu_count);
+ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0, ACPI_MTX_DO_NOT_LOCK);
+ }
+
/* Re-enable interrupts */
local_irq_enable();
/* Compute time (ticks) that we were actually asleep */
@@ -519,6 +544,30 @@ static int acpi_processor_get_power_info_fadt (struct acpi_processor *pr)
}
+static int acpi_processor_get_power_info_default_c1 (struct acpi_processor *pr)
+{
+ int i;
+
+ ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_default_c1");
+
+ for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
+ memset(&(pr->power.states[i]), 0,
+ sizeof(struct acpi_processor_cx));
+
+ /* if info is obtained from pblk/fadt, type equals state */
+ pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
+ pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
+ pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
+
+ /* the C0 state only exists as a filler in our array,
+ * and all processors need to support C1 */
+ pr->power.states[ACPI_STATE_C0].valid = 1;
+ pr->power.states[ACPI_STATE_C1].valid = 1;
+
+ return_VALUE(0);
+}
+
+
static int acpi_processor_get_power_info_cst (struct acpi_processor *pr)
{
acpi_status status = 0;
@@ -529,15 +578,13 @@ static int acpi_processor_get_power_info_cst (struct acpi_processor *pr)
ACPI_FUNCTION_TRACE("acpi_processor_get_power_info_cst");
- if (errata.smp)
- return_VALUE(-ENODEV);
-
if (nocst)
return_VALUE(-ENODEV);
pr->power.count = 0;
for (i = 0; i < ACPI_PROCESSOR_MAX_POWER; i++)
- memset(pr->power.states, 0, sizeof(struct acpi_processor_cx));
+ memset(&(pr->power.states[i]), 0,
+ sizeof(struct acpi_processor_cx));
status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
@@ -664,13 +711,6 @@ static void acpi_processor_power_verify_c2(struct acpi_processor_cx *cx)
return_VOID;
}
- /* We're (currently) only supporting C2 on UP */
- else if (errata.smp) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C2 not supported in SMP mode\n"));
- return_VOID;
- }
-
/*
* Otherwise we've met all of our C2 requirements.
* Normalize the C2 latency to expidite policy
@@ -686,6 +726,8 @@ static void acpi_processor_power_verify_c3(
struct acpi_processor *pr,
struct acpi_processor_cx *cx)
{
+ static int bm_check_flag;
+
ACPI_FUNCTION_TRACE("acpi_processor_get_power_verify_c3");
if (!cx->address)
@@ -702,20 +744,6 @@ static void acpi_processor_power_verify_c3(
return_VOID;
}
- /* bus mastering control is necessary */
- else if (!pr->flags.bm_control) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C3 support requires bus mastering control\n"));
- return_VOID;
- }
-
- /* We're (currently) only supporting C2 on UP */
- else if (errata.smp) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "C3 not supported in SMP mode\n"));
- return_VOID;
- }
-
/*
* PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
* DMA transfers are used by any ISA device to avoid livelock.
@@ -729,6 +757,37 @@ static void acpi_processor_power_verify_c3(
return_VOID;
}
+ /* All the logic here assumes flags.bm_check is same across all CPUs */
+ if (!bm_check_flag) {
+ /* Determine whether bm_check is needed based on CPU */
+ acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
+ bm_check_flag = pr->flags.bm_check;
+ } else {
+ pr->flags.bm_check = bm_check_flag;
+ }
+
+ if (pr->flags.bm_check) {
+ /* bus mastering control is necessary */
+ if (!pr->flags.bm_control) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "C3 support requires bus mastering control\n"));
+ return_VOID;
+ }
+ } else {
+ /*
+ * WBINVD should be set in fadt, for C3 state to be
+ * supported on when bm_check is not required.
+ */
+ if (acpi_fadt.wb_invd != 1) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Cache invalidation should work properly"
+ " for C3 to be enabled on SMP systems\n"));
+ return_VOID;
+ }
+ acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD,
+ 0, ACPI_MTX_DO_NOT_LOCK);
+ }
+
/*
* Otherwise we've met all of our C3 requirements.
* Normalize the C3 latency to expidite policy. Enable
@@ -737,7 +796,6 @@ static void acpi_processor_power_verify_c3(
*/
cx->valid = 1;
cx->latency_ticks = US_TO_PM_TIMER_TICKS(cx->latency);
- pr->flags.bm_check = 1;
return_VOID;
}
@@ -786,11 +844,8 @@ static int acpi_processor_get_power_info (
result = acpi_processor_get_power_info_cst(pr);
if ((result) || (acpi_processor_power_verify(pr) < 2)) {
result = acpi_processor_get_power_info_fadt(pr);
- if (result)
- return_VALUE(result);
-
- if (acpi_processor_power_verify(pr) < 2)
- return_VALUE(-ENODEV);
+ if ((result) || (acpi_processor_power_verify(pr) < 2))
+ result = acpi_processor_get_power_info_default_c1(pr);
}
/*
@@ -810,11 +865,10 @@ static int acpi_processor_get_power_info (
* CPU as being "idle manageable"
*/
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
- if (pr->power.states[i].valid)
+ if (pr->power.states[i].valid) {
pr->power.count = i;
- if ((pr->power.states[i].valid) &&
- (pr->power.states[i].type >= ACPI_STATE_C2))
pr->flags.power = 1;
+ }
}
return_VALUE(0);
@@ -829,7 +883,7 @@ int acpi_processor_cst_has_changed (struct acpi_processor *pr)
if (!pr)
return_VALUE(-EINVAL);
- if (errata.smp || nocst) {
+ if ( nocst) {
return_VALUE(-ENODEV);
}
@@ -929,7 +983,6 @@ static struct file_operations acpi_processor_power_fops = {
.release = single_release,
};
-
int acpi_processor_power_init(struct acpi_processor *pr, struct acpi_device *device)
{
acpi_status status = 0;
@@ -946,7 +999,10 @@ int acpi_processor_power_init(struct acpi_processor *pr, struct acpi_device *dev
first_run++;
}
- if (!errata.smp && (pr->id == 0) && acpi_fadt.cst_cnt && !nocst) {
+ if (!pr)
+ return_VALUE(-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,
@@ -954,6 +1010,8 @@ int acpi_processor_power_init(struct acpi_processor *pr, struct acpi_device *dev
}
}
+ acpi_processor_power_init_pdc(&(pr->power), pr->id);
+ acpi_processor_set_pdc(pr, pr->power.pdc);
acpi_processor_get_power_info(pr);
/*
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-30 11:48:34 +0000