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authorLinus Torvalds <torvalds@linux-foundation.org>2017-03-24 14:29:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-03-24 14:29:23 -0700
commit42ea16f815e7adb155557eb3017510e635edbcfe (patch)
tree63b2c875425f2ac7f75f20d74739a24ca7660c8d
parent69917da73a4fa03b2c13fde976ba1aad950d9181 (diff)
parent1914f0cd203c941bba72f9452c8290324f1ef3dc (diff)
downloadlinux-42ea16f815e7adb155557eb3017510e635edbcfe.tar.gz
Merge tag 'for-linus-4.11b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross: "Fixes for PM under Xen" * tag 'for-linus-4.11b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/acpi: upload PM state from init-domain to Xen xen/acpi: Replace hard coded "ACPI0007"
-rw-r--r--drivers/xen/xen-acpi-processor.c36
1 files changed, 27 insertions, 9 deletions
diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 4ce10bcca18b..23e391d3ec01 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -27,10 +27,10 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
+#include <linux/syscore_ops.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>
@@ -408,7 +408,7 @@ static int check_acpi_ids(struct acpi_processor *pr_backup)
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
read_acpi_id, NULL, NULL, NULL);
- acpi_get_devices("ACPI0007", read_acpi_id, NULL, NULL);
+ acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, read_acpi_id, NULL, NULL);
upload:
if (!bitmap_equal(acpi_id_present, acpi_ids_done, nr_acpi_bits)) {
@@ -466,15 +466,33 @@ static int xen_upload_processor_pm_data(void)
return rc;
}
-static int xen_acpi_processor_resume(struct notifier_block *nb,
- unsigned long action, void *data)
+static void xen_acpi_processor_resume_worker(struct work_struct *dummy)
{
+ int rc;
+
bitmap_zero(acpi_ids_done, nr_acpi_bits);
- return xen_upload_processor_pm_data();
+
+ rc = xen_upload_processor_pm_data();
+ if (rc != 0)
+ pr_info("ACPI data upload failed, error = %d\n", rc);
+}
+
+static void xen_acpi_processor_resume(void)
+{
+ static DECLARE_WORK(wq, xen_acpi_processor_resume_worker);
+
+ /*
+ * xen_upload_processor_pm_data() calls non-atomic code.
+ * However, the context for xen_acpi_processor_resume is syscore
+ * with only the boot CPU online and in an atomic context.
+ *
+ * So defer the upload for some point safer.
+ */
+ schedule_work(&wq);
}
-struct notifier_block xen_acpi_processor_resume_nb = {
- .notifier_call = xen_acpi_processor_resume,
+static struct syscore_ops xap_syscore_ops = {
+ .resume = xen_acpi_processor_resume,
};
static int __init xen_acpi_processor_init(void)
@@ -527,7 +545,7 @@ static int __init xen_acpi_processor_init(void)
if (rc)
goto err_unregister;
- xen_resume_notifier_register(&xen_acpi_processor_resume_nb);
+ register_syscore_ops(&xap_syscore_ops);
return 0;
err_unregister:
@@ -544,7 +562,7 @@ static void __exit xen_acpi_processor_exit(void)
{
int i;
- xen_resume_notifier_unregister(&xen_acpi_processor_resume_nb);
+ unregister_syscore_ops(&xap_syscore_ops);
kfree(acpi_ids_done);
kfree(acpi_id_present);
kfree(acpi_id_cst_present);