xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

firmware: arm_sdei: Add ACPI GHES registration helper

Browse Source 
APEI's Generic Hardware Error Source structures do not describe
whether the SDEI event is shared or private, as this information is
discoverable via the API.

GHES needs to know whether an event is normal or critical to avoid
sharing locks or fixmap entries, but GHES shouldn't have to know about
the SDEI API.

Add a helper to register the GHES using the appropriate normal or
critical callback.

Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
James Morse
2019-01-29 18:49:01 +00:00
committed by Rafael J. Wysocki
parent b972d2eaf0
commit f96935d3bc
3 changed files with 78 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
drivers/firmware/arm_sdei.c
View File

@@ -2,6 +2,7 @@
// Copyright (C) 2017 Arm Ltd.
#define pr_fmt(fmt) "sdei: " fmt
#include <acpi/ghes.h>
#include <linux/acpi.h>
#include <linux/arm_sdei.h>
#include <linux/arm-smccc.h>
@@ -887,6 +888,73 @@ static void sdei_smccc_hvc(unsigned long function_id,
arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res);
}
int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
sdei_event_callback *critical_cb)
{
int err;
u64 result;
u32 event_num;
sdei_event_callback *cb;
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
return -EOPNOTSUPP;
event_num = ghes->generic->notify.vector;
if (event_num == 0) {
/*
* Event 0 is reserved by the specification for
* SDEI_EVENT_SIGNAL.
*/
return -EINVAL;
}
err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY,
&result);
if (err)
return err;
if (result == SDEI_EVENT_PRIORITY_CRITICAL)
cb = critical_cb;
else
cb = normal_cb;
err = sdei_event_register(event_num, cb, ghes);
if (!err)
err = sdei_event_enable(event_num);
return err;
}
int sdei_unregister_ghes(struct ghes *ghes)
{
int i;
int err;
u32 event_num = ghes->generic->notify.vector;
might_sleep();
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
return -EOPNOTSUPP;
/*
* The event may be running on another CPU. Disable it
* to stop new events, then try to unregister a few times.
*/
err = sdei_event_disable(event_num);
if (err)
return err;
for (i = 0; i < 3; i++) {
err = sdei_event_unregister(event_num);
if (err != -EINPROGRESS)
break;
schedule();
}
return err;
}
static int sdei_get_conduit(struct platform_device *pdev)
{
const char *method;