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| author | Sai Praneeth <sai.praneeth.prakhya@intel.com> | 2018-09-11 22:15:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-18 09:14:21 +0300 |
| commit | 53afdba2c35e6c4a9e5e2e05cf94e72d7ab51660 (patch) | |
| tree | 22e51cd6352eb8951b47c3c1c86ef47969a2fd97 /include/linux | |
| parent | 86896c1c578521b3a96c1178fafe7cdad858248c (diff) | |
| download | linux-53afdba2c35e6c4a9e5e2e05cf94e72d7ab51660.tar.xz | |
efi: Make efi_rts_work accessible to efi page fault handler
commit 9dbbedaa6171247c4c7c40b83f05b200a117c2e0 upstream.
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>
Fixes: 3eb420e70d87 (“efi: Use a work queue to invoke EFI Runtime Services”)
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Cc: Caspar Zhang <caspar@linux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/efi.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h index cc3391796c0b..6797811bf1e6 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1664,6 +1664,42 @@ 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; |