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xen: Re-upload processor PM data to hypervisor after S3 resume (v2)

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Upon resume, it was found that ACPI C-states were missing from non-boot CPUs.
This change registers a syscore_ops handler for this case, and re-uploads the
PM information to the hypervisor to properly reset the C-state on these
processors.

v2:
v1 did not go through the check_acpi_ids() code-path, and missed some cases when
xen was running with the dom0_max_vcpus= command line parameter.

Signed-Off-By: Ben Guthro <benjamin.guthro@citrix.com>
[v3: Ate some tabs, s/printk/pr_info/]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ben Guthro 2013-04-17 09:18:49 -04:00 committed by Konrad Rzeszutek Wilk
parent b12abaa192
commit 3fac10145b
1 changed files with 53 additions and 25 deletions
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78
drivers/xen/xen-acpi-processor.c
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@ -25,6 +25,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/syscore_ops.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>
@ -51,9 +52,9 @@ static DEFINE_MUTEX(acpi_ids_mutex);
/* Which ACPI ID we have processed from 'struct acpi_processor'. */
static unsigned long *acpi_ids_done;
/* Which ACPI ID exist in the SSDT/DSDT processor definitions. */
static unsigned long __initdata *acpi_id_present;
static unsigned long *acpi_id_present;
/* And if there is an _CST definition (or a PBLK) for the ACPI IDs */
static unsigned long __initdata *acpi_id_cst_present;
static unsigned long *acpi_id_cst_present;
static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
{
@ -390,6 +391,10 @@ static int __init check_acpi_ids(struct acpi_processor *pr_backup)
if (!pr_backup)
return -ENODEV;
if (acpi_id_present && acpi_id_cst_present)
/* OK, done this once .. skip to uploading */
goto upload;
/* All online CPUs have been processed at this stage. Now verify
* whether in fact "online CPUs" == physical CPUs.
*/
@ -408,6 +413,7 @@ static int __init check_acpi_ids(struct acpi_processor *pr_backup)
read_acpi_id, NULL, NULL, NULL);
acpi_get_devices("ACPI0007", read_acpi_id, NULL, NULL);
upload:
if (!bitmap_equal(acpi_id_present, acpi_ids_done, nr_acpi_bits)) {
unsigned int i;
for_each_set_bit(i, acpi_id_present, nr_acpi_bits) {
@ -417,10 +423,7 @@ static int __init check_acpi_ids(struct acpi_processor *pr_backup)
(void)upload_pm_data(pr_backup);
}
}
kfree(acpi_id_present);
acpi_id_present = NULL;
kfree(acpi_id_cst_present);
acpi_id_cst_present = NULL;
return 0;
}
static int __init check_prereq(void)
@ -467,9 +470,46 @@ static void free_acpi_perf_data(void)
free_percpu(acpi_perf_data);
}
static int __init xen_acpi_processor_init(void)
static int xen_upload_processor_pm_data(void)
{
struct acpi_processor *pr_backup = NULL;
unsigned int i;
int rc = 0;
pr_info(DRV_NAME "Uploading Xen processor PM info\n");
for_each_possible_cpu(i) {
struct acpi_processor *_pr;
_pr = per_cpu(processors, i /* APIC ID */);
if (!_pr)
continue;
if (!pr_backup) {
pr_backup = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
if (pr_backup)
memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
}
(void)upload_pm_data(_pr);
}
rc = check_acpi_ids(pr_backup);
kfree(pr_backup);
return rc;
}
static void xen_acpi_processor_resume(void)
{
bitmap_zero(acpi_ids_done, nr_acpi_bits);
xen_upload_processor_pm_data();
}
static struct syscore_ops xap_syscore_ops = {
.resume = xen_acpi_processor_resume,
};
static int __init xen_acpi_processor_init(void)
{
unsigned int i;
int rc = check_prereq();
@ -514,27 +554,12 @@ static int __init xen_acpi_processor_init(void)
goto err_out;
}
for_each_possible_cpu(i) {
struct acpi_processor *_pr;
_pr = per_cpu(processors, i /* APIC ID */);
if (!_pr)
continue;
if (!pr_backup) {
pr_backup = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
if (pr_backup)
memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
}
(void)upload_pm_data(_pr);
}
rc = check_acpi_ids(pr_backup);
kfree(pr_backup);
pr_backup = NULL;
rc = xen_upload_processor_pm_data();
if (rc)
goto err_unregister;
register_syscore_ops(&xap_syscore_ops);
return 0;
err_unregister:
for_each_possible_cpu(i) {
@ -552,7 +577,10 @@ static void __exit xen_acpi_processor_exit(void)
{
int i;
unregister_syscore_ops(&xap_syscore_ops);
kfree(acpi_ids_done);
kfree(acpi_id_present);
kfree(acpi_id_cst_present);
for_each_possible_cpu(i) {
struct acpi_processor_performance *perf;
perf = per_cpu_ptr(acpi_perf_data, i);