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path: root/drivers/xen/xen-acpi-processor.c
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Diffstat (limited to 'drivers/xen/xen-acpi-processor.c')
-rw-r--r--drivers/xen/xen-acpi-processor.c121
1 files changed, 76 insertions, 45 deletions
diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 7ff2569e17a..59fc190f1e9 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -17,6 +17,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/cpumask.h>
#include <linux/cpufreq.h>
#include <linux/freezer.h>
@@ -25,16 +27,13 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
+#include <linux/acpi.h>
#include <acpi/processor.h>
-
#include <xen/xen.h>
+#include <xen/xen-ops.h>
#include <xen/interface/platform.h>
#include <asm/xen/hypercall.h>
-#define DRV_NAME "xen-acpi-processor: "
-
static int no_hypercall;
MODULE_PARM_DESC(off, "Inhibit the hypercall.");
module_param_named(off, no_hypercall, int, 0400);
@@ -51,9 +50,9 @@ 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)
{
@@ -98,13 +97,12 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
dst_cx->type = cx->type;
dst_cx->latency = cx->latency;
- dst_cx->power = cx->power;
dst_cx->dpcnt = 0;
set_xen_guest_handle(dst_cx->dp, NULL);
}
if (!ok) {
- pr_debug(DRV_NAME "No _Cx for ACPI CPU %u\n", _pr->acpi_id);
+ pr_debug("No _Cx for ACPI CPU %u\n", _pr->acpi_id);
kfree(dst_cx_states);
return -EINVAL;
}
@@ -129,11 +127,11 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
pr_debug(" C%d: %s %d uS\n",
cx->type, cx->desc, (u32)cx->latency);
}
- } else if (ret != -EINVAL)
+ } else if ((ret != -EINVAL) && (ret != -ENOSYS))
/* EINVAL means the ACPI ID is incorrect - meaning the ACPI
* table is referencing a non-existing CPU - which can happen
* with broken ACPI tables. */
- pr_err(DRV_NAME "(CX): Hypervisor error (%d) for ACPI CPU%u\n",
+ pr_err("(CX): Hypervisor error (%d) for ACPI CPU%u\n",
ret, _pr->acpi_id);
kfree(dst_cx_states);
@@ -239,7 +237,7 @@ static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
dst_perf->flags |= XEN_PX_PSD;
if (dst_perf->flags != (XEN_PX_PSD | XEN_PX_PSS | XEN_PX_PCT | XEN_PX_PPC)) {
- pr_warn(DRV_NAME "ACPI CPU%u missing some P-state data (%x), skipping.\n",
+ pr_warn("ACPI CPU%u missing some P-state data (%x), skipping\n",
_pr->acpi_id, dst_perf->flags);
ret = -ENODEV;
goto err_free;
@@ -261,12 +259,12 @@ static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
(u32) perf->states[i].power,
(u32) perf->states[i].transition_latency);
}
- } else if (ret != -EINVAL)
+ } else if ((ret != -EINVAL) && (ret != -ENOSYS))
/* EINVAL means the ACPI ID is incorrect - meaning the ACPI
* table is referencing a non-existing CPU - which can happen
* with broken ACPI tables. */
- pr_warn(DRV_NAME "(_PXX): Hypervisor error (%d) for ACPI CPU%u\n",
- ret, _pr->acpi_id);
+ pr_warn("(_PXX): Hypervisor error (%d) for ACPI CPU%u\n",
+ ret, _pr->acpi_id);
err_free:
if (!IS_ERR_OR_NULL(dst_states))
kfree(dst_states);
@@ -318,7 +316,7 @@ static unsigned int __init get_max_acpi_id(void)
max_acpi_id = max(info->acpi_id, max_acpi_id);
}
max_acpi_id *= 2; /* Slack for CPU hotplug support. */
- pr_debug(DRV_NAME "Max ACPI ID: %u\n", max_acpi_id);
+ pr_debug("Max ACPI ID: %u\n", max_acpi_id);
return max_acpi_id;
}
/*
@@ -330,7 +328,7 @@ static unsigned int __init get_max_acpi_id(void)
* for_each_[present|online]_cpu macros which are banded to the virtual
* CPU amount.
*/
-static acpi_status __init
+static acpi_status
read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
{
u32 acpi_id;
@@ -365,15 +363,14 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
/* There are more ACPI Processor objects than in x2APIC or MADT.
* This can happen with incorrect ACPI SSDT declerations. */
if (acpi_id > nr_acpi_bits) {
- pr_debug(DRV_NAME "We only have %u, trying to set %u\n",
+ pr_debug("We only have %u, trying to set %u\n",
nr_acpi_bits, acpi_id);
return AE_OK;
}
/* OK, There is a ACPI Processor object */
__set_bit(acpi_id, acpi_id_present);
- pr_debug(DRV_NAME "ACPI CPU%u w/ PBLK:0x%lx\n", acpi_id,
- (unsigned long)pblk);
+ pr_debug("ACPI CPU%u w/ PBLK:0x%lx\n", acpi_id, (unsigned long)pblk);
status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
if (ACPI_FAILURE(status)) {
@@ -385,12 +382,16 @@ read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}
-static int __init check_acpi_ids(struct acpi_processor *pr_backup)
+static int 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.
*/
@@ -409,6 +410,7 @@ 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) {
@@ -418,10 +420,7 @@ 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)
@@ -468,10 +467,48 @@ 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("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 int xen_acpi_processor_resume(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ bitmap_zero(acpi_ids_done, nr_acpi_bits);
+ return xen_upload_processor_pm_data();
+}
+
+struct notifier_block xen_acpi_processor_resume_nb = {
+ .notifier_call = xen_acpi_processor_resume,
+};
+
+static int __init xen_acpi_processor_init(void)
+{
+ unsigned int i;
int rc = check_prereq();
if (rc)
@@ -484,7 +521,7 @@ static int __init xen_acpi_processor_init(void)
acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
if (!acpi_perf_data) {
- pr_debug(DRV_NAME "Memory allocation error for acpi_perf_data.\n");
+ pr_debug("Memory allocation error for acpi_perf_data\n");
kfree(acpi_ids_done);
return -ENOMEM;
}
@@ -501,34 +538,25 @@ static int __init xen_acpi_processor_init(void)
(void)acpi_processor_preregister_performance(acpi_perf_data);
for_each_possible_cpu(i) {
+ struct acpi_processor *pr;
struct acpi_processor_performance *perf;
+ pr = per_cpu(processors, i);
perf = per_cpu_ptr(acpi_perf_data, i);
- rc = acpi_processor_register_performance(perf, i);
+ if (!pr)
+ continue;
+
+ pr->performance = perf;
+ rc = acpi_processor_get_performance_info(pr);
if (rc)
goto err_out;
}
- rc = acpi_processor_notify_smm(THIS_MODULE);
- if (rc)
- goto err_unregister;
- 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);
- memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
- }
- (void)upload_pm_data(_pr);
- }
- rc = check_acpi_ids(pr_backup);
+ rc = xen_upload_processor_pm_data();
if (rc)
goto err_unregister;
- kfree(pr_backup);
+ xen_resume_notifier_register(&xen_acpi_processor_resume_nb);
return 0;
err_unregister:
@@ -547,7 +575,10 @@ static void __exit xen_acpi_processor_exit(void)
{
int i;
+ xen_resume_notifier_unregister(&xen_acpi_processor_resume_nb);
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);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 15:14:59 +0000