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authorSai Praneeth <sai.praneeth.prakhya@intel.com>2018-09-11 12:15:21 -0700
committerArd Biesheuvel <ard.biesheuvel@linaro.org>2018-09-26 12:14:50 +0200
commit9dbbedaa6171247c4c7c40b83f05b200a117c2e0 (patch)
treef2cc64b3a22a8b678aa8bb4d21b0f49d5f6ae749 /include/linux/efi.h
parentbcb31c6225c2420344ebc1e87834252b8cf4923c (diff)
efi: Make efi_rts_work accessible to efi page fault handler
After the kernel has booted, if any accesses by firmware causes a page fault, the efi page fault handler would freeze efi_rts_wq and schedules a new process. To do this, the efi page fault handler needs efi_rts_work. Hence, make it accessible. There will be no race conditions in accessing this structure, because all the calls to efi runtime services are already serialized. Tested-by: Bhupesh Sharma <bhsharma@redhat.com> Suggested-by: Matt Fleming <matt@codeblueprint.co.uk> Based-on-code-from: Ricardo Neri <ricardo.neri@intel.com> Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'include/linux/efi.h')
-rw-r--r--include/linux/efi.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 22e4de9d3700..a929d2bf41fa 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1662,6 +1662,42 @@ struct linux_efi_tpm_eventlog {
extern int efi_tpm_eventlog_init(void);
+/* efi_runtime_service() function identifiers */
+enum efi_rts_ids {
+ GET_TIME,
+ SET_TIME,
+ GET_WAKEUP_TIME,
+ SET_WAKEUP_TIME,
+ GET_VARIABLE,
+ GET_NEXT_VARIABLE,
+ SET_VARIABLE,
+ QUERY_VARIABLE_INFO,
+ GET_NEXT_HIGH_MONO_COUNT,
+ UPDATE_CAPSULE,
+ QUERY_CAPSULE_CAPS,
+};
+
+/*
+ * efi_runtime_work: Details of EFI Runtime Service work
+ * @arg<1-5>: EFI Runtime Service function arguments
+ * @status: Status of executing EFI Runtime Service
+ * @efi_rts_id: EFI Runtime Service function identifier
+ * @efi_rts_comp: Struct used for handling completions
+ */
+struct efi_runtime_work {
+ void *arg1;
+ void *arg2;
+ void *arg3;
+ void *arg4;
+ void *arg5;
+ efi_status_t status;
+ struct work_struct work;
+ enum efi_rts_ids efi_rts_id;
+ struct completion efi_rts_comp;
+};
+
+extern struct efi_runtime_work efi_rts_work;
+
/* Workqueue to queue EFI Runtime Services */
extern struct workqueue_struct *efi_rts_wq;