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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-02 13:25:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-02 13:25:52 -0700
commit118d6e98293b30aee378a6b08d27a35320a3e34f (patch)
treef96ba1dd4e7f6ae7759061e7728f8dc705f73c67 /arch
parent355ba37d756c38962fe9bb616f5f48eb12a7e11e (diff)
parent48ccdeddc54771ecdc46fac098bac689e9df24ca (diff)
Merge tag 'acpi-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI updates from Rafael Wysocki: "These update the ACPICA code in the kernel to upstream revision 20200430, fix several reference counting errors related to ACPI tables, add _Exx / _Lxx support to the GED driver, add a new acpi_evaluate_reg() helper, add new DPTF battery participant driver and extend the DPFT power participant driver, improve the handling of memory failures in the APEI code, add a blacklist entry to the backlight driver, update the PMIC driver and the processor idle driver, fix two kobject reference count leaks, and make a few janitory changes. Specifics: - Update the ACPICA code in the kernel to upstream revision 20200430: - Move acpi_gbl_next_cmd_num definition (Erik Kaneda). - Ignore AE_ALREADY_EXISTS status in the disassembler when parsing create operators (Erik Kaneda). - Add status checks to the dispatcher (Erik Kaneda). - Fix required parameters for _NIG and _NIH (Erik Kaneda). - Make acpi_protocol_lengths static (Yue Haibing). - Fix ACPI table reference counting errors in several places, mostly in error code paths (Hanjun Guo). - Extend the Generic Event Device (GED) driver to support _Exx and _Lxx handler methods (Ard Biesheuvel). - Add new acpi_evaluate_reg() helper and modify the ACPI PCI hotplug code to use it (Hans de Goede). - Add new DPTF battery participant driver and make the DPFT power participant driver create more sysfs device attributes (Srinivas Pandruvada). - Improve the handling of memory failures in APEI (James Morse). - Add new blacklist entry for Acer TravelMate 5735Z to the backlight driver (Paul Menzel). - Add i2c address for thermal control to the PMIC driver (Mauro Carvalho Chehab). - Allow the ACPI processor idle driver to work on platforms with only one ACPI C-state present (Zhang Rui). - Fix kobject reference count leaks in error code paths in two places (Qiushi Wu). - Delete unused proc filename macros and make some symbols static (Pascal Terjan, Zheng Zengkai, Zou Wei)" * tag 'acpi-5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits) ACPI: CPPC: Fix reference count leak in acpi_cppc_processor_probe() ACPI: sysfs: Fix reference count leak in acpi_sysfs_add_hotplug_profile() ACPI: GED: use correct trigger type field in _Exx / _Lxx handling ACPI: DPTF: Add battery participant driver ACPI: DPTF: Additional sysfs attributes for power participant driver ACPI: video: Use native backlight on Acer TravelMate 5735Z arm64: acpi: Make apei_claim_sea() synchronise with APEI's irq work ACPI: APEI: Kick the memory_failure() queue for synchronous errors mm/memory-failure: Add memory_failure_queue_kick() ACPI / PMIC: Add i2c address for thermal control ACPI: GED: add support for _Exx / _Lxx handler methods ACPI: Delete unused proc filename macros ACPI: hotplug: PCI: Use the new acpi_evaluate_reg() helper ACPI: utils: Add acpi_evaluate_reg() helper ACPI: debug: Make two functions static ACPI: sleep: Put the FACS table after using it ACPI: scan: Put SPCR and STAO table after using it ACPI: EC: Put the ACPI table after using it ACPI: APEI: Put the HEST table for error path ACPI: APEI: Put the error record serialization table for error path ...
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/kernel/acpi.c25
-rw-r--r--arch/arm64/mm/fault.c12
2 files changed, 32 insertions, 5 deletions
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index a100483b47c4..46ec402e97ed 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -19,6 +19,7 @@
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
+#include <linux/irq_work.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/smp.h>
@@ -269,6 +270,7 @@ pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
int apei_claim_sea(struct pt_regs *regs)
{
int err = -ENOENT;
+ bool return_to_irqs_enabled;
unsigned long current_flags;
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
@@ -276,6 +278,12 @@ int apei_claim_sea(struct pt_regs *regs)
current_flags = local_daif_save_flags();
+ /* current_flags isn't useful here as daif doesn't tell us about pNMI */
+ return_to_irqs_enabled = !irqs_disabled_flags(arch_local_save_flags());
+
+ if (regs)
+ return_to_irqs_enabled = interrupts_enabled(regs);
+
/*
* SEA can interrupt SError, mask it and describe this as an NMI so
* that APEI defers the handling.
@@ -284,6 +292,23 @@ int apei_claim_sea(struct pt_regs *regs)
nmi_enter();
err = ghes_notify_sea();
nmi_exit();
+
+ /*
+ * APEI NMI-like notifications are deferred to irq_work. Unless
+ * we interrupted irqs-masked code, we can do that now.
+ */
+ if (!err) {
+ if (return_to_irqs_enabled) {
+ local_daif_restore(DAIF_PROCCTX_NOIRQ);
+ __irq_enter();
+ irq_work_run();
+ __irq_exit();
+ } else {
+ pr_warn_ratelimited("APEI work queued but not completed");
+ err = -EINPROGRESS;
+ }
+ }
+
local_daif_restore(current_flags);
return err;
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index c9cedc0432d2..dff2d72b0883 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -635,11 +635,13 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
inf = esr_to_fault_info(esr);
- /*
- * Return value ignored as we rely on signal merging.
- * Future patches will make this more robust.
- */
- apei_claim_sea(regs);
+ if (user_mode(regs) && apei_claim_sea(regs) == 0) {
+ /*
+ * APEI claimed this as a firmware-first notification.
+ * Some processing deferred to task_work before ret_to_user().
+ */
+ return 0;
+ }
if (esr & ESR_ELx_FnV)
siaddr = NULL;