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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] Backport of powernow-k8 cpufreq changes, required for power management
# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1190294190 -3600
# Node ID 8a407c41dfb0cc03b66366b45eacd48c3e7bda4c
# Parent 08e2785d344f66abe3e84b875c3cb7b26497459f
Backport of powernow-k8 cpufreq changes, required for power management
on Xen.
Signed-off-by: Mark Langsdorf <mark.langsdorf@xxxxxxx>
---
arch/i386/kernel/cpu/cpufreq/powernow-k8.c | 122 +++++++++++++++++++----------
arch/i386/kernel/cpu/cpufreq/powernow-k8.h | 3
2 files changed, 85 insertions(+), 40 deletions(-)
diff -r 08e2785d344f -r 8a407c41dfb0 arch/i386/kernel/cpu/cpufreq/powernow-k8.c
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c Wed Sep 19 16:26:49
2007 +0100
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c Thu Sep 20 14:16:30
2007 +0100
@@ -738,6 +738,7 @@ static int find_psb_table(struct powerno
data->numps = psb->numps;
dprintk("numpstates: 0x%x\n", data->numps);
+ data->starting_core_affinity = cpumask_of_cpu(0);
return fill_powernow_table(data, (struct pst_s *)(psb+1),
maxvid);
}
/*
@@ -758,15 +759,43 @@ static int find_psb_table(struct powerno
#ifdef CONFIG_X86_POWERNOW_K8_ACPI
static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
unsigned int index)
{
- if (!data->acpi_data.state_count || (cpu_family == CPU_HW_PSTATE))
+ if (!data->acpi_data->state_count || (cpu_family == CPU_HW_PSTATE))
return;
- data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) &
IRT_MASK;
- data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) &
RVO_MASK;
- data->exttype = (data->acpi_data.states[index].control >>
EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
- data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT)
& PLL_L_MASK;
- data->vidmvs = 1 << ((data->acpi_data.states[index].control >>
MVS_SHIFT) & MVS_MASK);
- data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) &
VST_MASK;
+ data->irt = (data->acpi_data->states[index].control >> IRT_SHIFT) &
IRT_MASK;
+ data->rvo = (data->acpi_data->states[index].control >> RVO_SHIFT) &
RVO_MASK;
+ data->exttype = (data->acpi_data->states[index].control >>
EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
+ data->plllock = (data->acpi_data->states[index].control >> PLL_L_SHIFT)
& PLL_L_MASK;
+ data->vidmvs = 1 << ((data->acpi_data->states[index].control >>
MVS_SHIFT) & MVS_MASK);
+ data->vstable = (data->acpi_data->states[index].control >> VST_SHIFT) &
VST_MASK;
+}
+
+static struct acpi_processor_performance *acpi_perf_data[NR_CPUS];
+static int preregister_valid = 0;
+
+static int powernow_k8_cpu_preinit_acpi()
+{
+ int i;
+ struct acpi_processor_performance *data;
+ for_each_possible_cpu(i) {
+ data = kzalloc(sizeof(struct acpi_processor_performance),
+ GFP_KERNEL);
+ if (!data) {
+ int j;
+ for_each_possible_cpu(j) {
+ kfree(acpi_perf_data[j]);
+ acpi_perf_data[j] = NULL;
+ }
+ return -ENODEV;
+ }
+ acpi_perf_data[i] = data;
+ }
+
+ if (acpi_processor_preregister_performance(acpi_perf_data))
+ return -ENODEV;
+ else
+ preregister_valid = 1;
+ return 0;
}
static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
@@ -774,28 +803,29 @@ static int powernow_k8_cpu_init_acpi(str
struct cpufreq_frequency_table *powernow_table;
int ret_val;
- if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
+ data->acpi_data = acpi_perf_data[data->cpu];
+ if (acpi_processor_register_performance(data->acpi_data, data->cpu)) {
dprintk("register performance failed: bad ACPI data\n");
return -EIO;
}
/* verify the data contained in the ACPI structures */
- if (data->acpi_data.state_count <= 1) {
+ if (data->acpi_data->state_count <= 1) {
dprintk("No ACPI P-States\n");
goto err_out;
}
- if ((data->acpi_data.control_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE) ||
- (data->acpi_data.status_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE)) {
+ if ((data->acpi_data->control_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE) ||
+ (data->acpi_data->status_register.space_id !=
ACPI_ADR_SPACE_FIXED_HARDWARE)) {
dprintk("Invalid control/status registers (%x - %x)\n",
- data->acpi_data.control_register.space_id,
- data->acpi_data.status_register.space_id);
+ data->acpi_data->control_register.space_id,
+ data->acpi_data->status_register.space_id);
goto err_out;
}
/* fill in data->powernow_table */
powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
- * (data->acpi_data.state_count + 1)), GFP_KERNEL);
+ * (data->acpi_data->state_count + 1)), GFP_KERNEL);
if (!powernow_table) {
dprintk("powernow_table memory alloc failure\n");
goto err_out;
@@ -808,28 +838,43 @@ static int powernow_k8_cpu_init_acpi(str
if (ret_val)
goto err_out_mem;
- powernow_table[data->acpi_data.state_count].frequency =
CPUFREQ_TABLE_END;
- powernow_table[data->acpi_data.state_count].index = 0;
+ powernow_table[data->acpi_data->state_count].frequency =
CPUFREQ_TABLE_END;
+ powernow_table[data->acpi_data->state_count].index = 0;
data->powernow_table = powernow_table;
/* fill in data */
- data->numps = data->acpi_data.state_count;
+ data->numps = data->acpi_data->state_count;
print_basics(data);
powernow_k8_acpi_pst_values(data, 0);
/* notify BIOS that we exist */
acpi_processor_notify_smm(THIS_MODULE);
+ /* determine affinity, from ACPI if available */
+ if (preregister_valid) {
+ if ((data->acpi_data->shared_type == CPUFREQ_SHARED_TYPE_ALL) ||
+ (data->acpi_data->shared_type == CPUFREQ_SHARED_TYPE_ANY))
+ data->starting_core_affinity =
data->acpi_data->shared_cpu_map;
+ else
+ data->starting_core_affinity =
cpumask_of_cpu(data->cpu);
+ } else {
+ /* best guess from family if not */
+ if (cpu_family == CPU_HW_PSTATE)
+ data->starting_core_affinity =
cpumask_of_cpu(data->cpu);
+ else
+ data->starting_core_affinity = cpu_core_map[data->cpu];
+ }
+
return 0;
err_out_mem:
kfree(powernow_table);
err_out:
- acpi_processor_unregister_performance(&data->acpi_data, data->cpu);
-
- /* data->acpi_data.state_count informs us at ->exit() whether ACPI was
used */
- data->acpi_data.state_count = 0;
+ acpi_processor_unregister_performance(data->acpi_data, data->cpu);
+
+ /* data->acpi_data->state_count informs us at ->exit() whether ACPI was
used */
+ data->acpi_data->state_count = 0;
return -ENODEV;
}
@@ -838,13 +883,13 @@ static int fill_powernow_table_pstate(st
{
int i;
- for (i = 0; i < data->acpi_data.state_count; i++) {
+ for (i = 0; i < data->acpi_data->state_count; i++) {
u32 index;
u32 hi = 0, lo = 0;
u32 fid;
u32 did;
- index = data->acpi_data.states[i].control & HW_PSTATE_MASK;
+ index = data->acpi_data->states[i].control & HW_PSTATE_MASK;
if (index > MAX_HW_PSTATE) {
printk(KERN_ERR PFX "invalid pstate %d - bad value
%d.\n", i, index);
printk(KERN_ERR PFX "Please report to BIOS
manufacturer\n");
@@ -865,10 +910,10 @@ static int fill_powernow_table_pstate(st
powernow_table[i].frequency = find_khz_freq_from_fiddid(fid,
did);
- if (powernow_table[i].frequency !=
(data->acpi_data.states[i].core_frequency * 1000)) {
+ if (powernow_table[i].frequency !=
(data->acpi_data->states[i].core_frequency * 1000)) {
printk(KERN_INFO PFX "invalid freq entries %u kHz vs.
%u kHz\n",
powernow_table[i].frequency,
- (unsigned int)
(data->acpi_data.states[i].core_frequency * 1000));
+ (unsigned int)
(data->acpi_data->states[i].core_frequency * 1000));
powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
continue;
}
@@ -880,16 +925,16 @@ static int fill_powernow_table_fidvid(st
{
int i;
int cntlofreq = 0;
- for (i = 0; i < data->acpi_data.state_count; i++) {
+ for (i = 0; i < data->acpi_data->state_count; i++) {
u32 fid;
u32 vid;
if (data->exttype) {
- fid = data->acpi_data.states[i].status & EXT_FID_MASK;
- vid = (data->acpi_data.states[i].status >> VID_SHIFT) &
EXT_VID_MASK;
+ fid = data->acpi_data->states[i].status & EXT_FID_MASK;
+ vid = (data->acpi_data->states[i].status >> VID_SHIFT)
& EXT_VID_MASK;
} else {
- fid = data->acpi_data.states[i].control & FID_MASK;
- vid = (data->acpi_data.states[i].control >> VID_SHIFT)
& VID_MASK;
+ fid = data->acpi_data->states[i].control & FID_MASK;
+ vid = (data->acpi_data->states[i].control >> VID_SHIFT)
& VID_MASK;
}
dprintk(" %d : fid 0x%x, vid 0x%x\n", i, fid, vid);
@@ -930,10 +975,10 @@ static int fill_powernow_table_fidvid(st
cntlofreq = i;
}
- if (powernow_table[i].frequency !=
(data->acpi_data.states[i].core_frequency * 1000)) {
+ if (powernow_table[i].frequency !=
(data->acpi_data->states[i].core_frequency * 1000)) {
printk(KERN_INFO PFX "invalid freq entries %u kHz vs.
%u kHz\n",
powernow_table[i].frequency,
- (unsigned int)
(data->acpi_data.states[i].core_frequency * 1000));
+ (unsigned int)
(data->acpi_data->states[i].core_frequency * 1000));
powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
continue;
}
@@ -943,14 +988,15 @@ static int fill_powernow_table_fidvid(st
static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data)
{
- if (data->acpi_data.state_count)
- acpi_processor_unregister_performance(&data->acpi_data,
data->cpu);
+ if (data->acpi_data->state_count)
+ acpi_processor_unregister_performance(data->acpi_data,
data->cpu);
}
#else
static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data) { return
-ENODEV; }
static void powernow_k8_cpu_exit_acpi(struct powernow_k8_data *data) { return;
}
static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data,
unsigned int index) { return; }
+static int powernow_k8_cpu_preinit_acpi() { return -ENODEV; }
#endif /* CONFIG_X86_POWERNOW_K8_ACPI */
/* Take a frequency, and issue the fid/vid transition command */
@@ -1164,7 +1210,7 @@ static int __cpuinit powernowk8_cpu_init
* an UP version, and is deprecated by AMD.
*/
if (num_online_cpus() != 1) {
- printk(KERN_ERR PFX "MP systems not supported by PSB
BIOS structure\n");
+ printk(KERN_ERR PFX "Your BIOS does not provide _PSS
objects. PowerNow! does not work on SMP systems without _PSS objects.
Complain to your BIOS vendor.\n");
kfree(data);
return -ENODEV;
}
@@ -1204,10 +1250,7 @@ static int __cpuinit powernowk8_cpu_init
set_cpus_allowed(current, oldmask);
pol->governor = CPUFREQ_DEFAULT_GOVERNOR;
- if (cpu_family == CPU_HW_PSTATE)
- pol->cpus = cpumask_of_cpu(pol->cpu);
- else
- pol->cpus = cpu_core_map[pol->cpu];
+ pol->cpus = data->starting_core_affinity;
data->available_cores = &(pol->cpus);
/* Take a crude guess here.
@@ -1323,6 +1366,7 @@ static int __cpuinit powernowk8_init(voi
}
if (supported_cpus == num_online_cpus()) {
+ powernow_k8_cpu_preinit_acpi();
printk(KERN_INFO PFX "Found %d %s "
"processors (" VERSION ")\n", supported_cpus,
boot_cpu_data.x86_model_id);
diff -r 08e2785d344f -r 8a407c41dfb0 arch/i386/kernel/cpu/cpufreq/powernow-k8.h
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.h Wed Sep 19 16:26:49
2007 +0100
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h Thu Sep 20 14:16:30
2007 +0100
@@ -32,12 +32,13 @@ struct powernow_k8_data {
#ifdef CONFIG_X86_POWERNOW_K8_ACPI
/* the acpi table needs to be kept. it's only available if ACPI was
* used to determine valid frequency/vid/fid states */
- struct acpi_processor_performance acpi_data;
+ struct acpi_processor_performance *acpi_data;
#endif
/* we need to keep track of associated cores, but let cpufreq
* handle hotplug events - so just point at cpufreq pol->cpus
* structure */
cpumask_t *available_cores;
+ cpumask_t starting_core_affinity;
};
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