Re: [PATCH v7 1/2] ACPI: APEI: explicit init HEST and GHES in apci_init

Shuai Xue
2022-02-22T06:04:51Z

Hi, Nathan and Rafael,

在 2022/2/22 AM2:18, Nathan Chancellor 写道:
> Hi Shuai,
>
> On Sat, Jan 22, 2022 at 01:26:17PM +0800, Shuai Xue wrote:
>> From commit e147133a42cb ("ACPI / APEI: Make hest.c manage the estatus
>> memory pool") was merged, ghes_init() relies on acpi_hest_init() to manage
>> the estatus memory pool. On the other hand, ghes_init() relies on
>> sdei_init() to detect the SDEI version and (un)register events. The
>> dependencies are as follows:
>>
>> ghes_init() => acpi_hest_init() => acpi_bus_init() => acpi_init()
>> ghes_init() => sdei_init()
>>
>> HEST is not PCI-specific and initcall ordering is implicit and not
>> well-defined within a level.
>>
>> Based on above, remove acpi_hest_init() from acpi_pci_root_init() and
>> convert ghes_init() and sdei_init() from initcalls to explicit calls in the
>> following order:
>>
>> acpi_hest_init()
>> ghes_init()
>> sdei_init()
>>
>> Signed-off-by: Shuai Xue <xueshuai@linux.alibaba.com>
>> ---
>> drivers/acpi/apei/ghes.c | 19 ++++++++-----------
>> drivers/acpi/bus.c | 2 ++
>> drivers/acpi/pci_root.c | 3 ---
>> drivers/firmware/Kconfig | 1 +
>> drivers/firmware/arm_sdei.c | 13 ++-----------
>> include/acpi/apei.h | 4 +++-
>> include/linux/arm_sdei.h | 2 ++
>> 7 files changed, 18 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index 0c5c9acc6254..aadc0a972f18 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -1457,33 +1457,35 @@ static struct platform_driver ghes_platform_driver = {
>> .remove = ghes_remove,
>> };
>>
>> -static int __init ghes_init(void)
>> +void __init ghes_init(void)
>> {
>> int rc;
>>
>> + sdei_init();
>> +
>> if (acpi_disabled)
>> - return -ENODEV;
>> + return;
>>
>> switch (hest_disable) {
>> case HEST_NOT_FOUND:
>> - return -ENODEV;
>> + return;
>> case HEST_DISABLED:
>> pr_info(GHES_PFX "HEST is not enabled!\n");
>> - return -EINVAL;
>> + return;
>> default:
>> break;
>> }
>>
>> if (ghes_disable) {
>> pr_info(GHES_PFX "GHES is not enabled!\n");
>> - return -EINVAL;
>> + return;
>> }
>>
>> ghes_nmi_init_cxt();
>>
>> rc = platform_driver_register(&ghes_platform_driver);
>> if (rc)
>> - goto err;
>> + return;
>>
>> rc = apei_osc_setup();
>> if (rc == 0 && osc_sb_apei_support_acked)
>> @@ -1494,9 +1496,4 @@ static int __init ghes_init(void)
>> pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
>> else
>> pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
>> -
>> - return 0;
>> -err:
>> - return rc;
>> }
>> -device_initcall(ghes_init);
>> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
>> index 07f604832fd6..3f403db20f69 100644
>> --- a/drivers/acpi/bus.c
>> +++ b/drivers/acpi/bus.c
>> @@ -1331,6 +1331,8 @@ static int __init acpi_init(void)
>>
>> pci_mmcfg_late_init();
>> acpi_iort_init();
>> + acpi_hest_init();
>> + ghes_init();
>> acpi_scan_init();
>> acpi_ec_init();
>> acpi_debugfs_init();
>> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
>> index b76db99cced3..6f9e75d14808 100644
>> --- a/drivers/acpi/pci_root.c
>> +++ b/drivers/acpi/pci_root.c
>> @@ -22,8 +22,6 @@
>> #include <linux/slab.h>
>> #include <linux/dmi.h>
>> #include <linux/platform_data/x86/apple.h>
>> -#include <acpi/apei.h> /* for acpi_hest_init() */
>> -
>> #include "internal.h"
>>
>> #define ACPI_PCI_ROOT_CLASS "pci_bridge"
>> @@ -943,7 +941,6 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
>>
>> void __init acpi_pci_root_init(void)
>> {
>> - acpi_hest_init();
>> if (acpi_pci_disabled)
>> return;
>>
>> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
>> index 75cb91055c17..ad114d9cdf8e 100644
>> --- a/drivers/firmware/Kconfig
>> +++ b/drivers/firmware/Kconfig
>> @@ -40,6 +40,7 @@ config ARM_SCPI_POWER_DOMAIN
>> config ARM_SDE_INTERFACE
>> bool "ARM Software Delegated Exception Interface (SDEI)"
>> depends on ARM64
>> + select ACPI_APEI_GHES
>
> As the kernel test robot pointed out [1], you cannot do this.
> CONFIG_ACPI_APEI_GHES is a user selectable symbol that has dependencies,
> which 'select' completely overrides, resulting in build failures when
> CONFIG_ACPI_APEI is not enabled.
>
> If CONFIG_ARM_SDE_INTERFACE truly requires CONFIG_ACPI_APEI_GHES, you
> should have "depends on ACPI_APEI_GHES".
>
> If CONFIG_ARM_SDE_INTERFACE soft depends on CONFIG_ACPI_APEI_GHES for
> functionality but can work without it, you could use
> "imply ACPI_APEI_GHES", which will enable CONFIG_ACPI_APEI_GHES if its
> dependencies are met.
>
> I noticed the same error with Alpine Linux's aarch64 configuration [2]
> if you wanted a quick configuration to test with.
>
> [1]: https://lore.kernel.org/r/202202151504.jWpZGPaH-lkp@intel.com/
> [2]: https://git.alpinelinux.org/aports/plain/community/linux-edge/config-edge.aarch64

Thank you for explaining the difference among 'select', 'depends on' and 'imply'.
I was wrong to use 'select'. sdei_init() is called in ghes_init() now, in other words,
CONFIG_ARM_SDE_INTERFACE truly requires CONFIG_ACPI_APEI_GHES, so we should use
'depends on'. I will send a new patch set to fix this problem.

Best Regards,
Shuai