On Fri, Jan 21, 2022 at 11:43:25AM +0800, Shuai Xue wrote:

在 2022/1/21 AM12:22, Bjorn Helgaas 写道:

quoted

On Thu, Jan 20, 2022 at 01:05:22PM +0800, Shuai Xue wrote:

quoted

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()
    sdei_init()
    ghes_init()

quoted

quoted

--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c

@@ -30,6 +30,7 @@
 #include <linux/acpi_viot.h>
 #include <linux/pci.h>
 #include <acpi/apei.h>
+#include <linux/arm_sdei.h>

This "arm" looks a little out of place in this supposedly arch-generic
code.  Not really a new thing with this patch, since this #include
already appears in drivers/acpi/apei/ghes.c.  Maybe it's unavoidable.

Yep, should we move sdei_init() into the beginning of ghes_init()?
...

quoted

Software Delegated Exception Interface (|SDEI|) is an Arm specification for
Non-secure world to register handlers with firmware to receive notifications
about system events.
LINK: https://github.com/ARM-software/arm-trusted-firmware/blob/master/docs/components/sdei.rst

I think SDEI is not a ACPI Specification but Arm specification so we should
not rename sdei_init() with an "acpi_" prefix.  If we move sdei_init() into
ghes_init(), and rename ghes_init() to acpi_ghes_init(), then all looks
fine? What's your opinion, Bjorn?

Makes sense to me, especially since drivers/acpi/apei/ghes.c already
includes linux/arm_sdei.h.  This is Rafael's area.

Bjorn

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