I finally found 1st commit (not connected with USB problem) which prevents
booting, but it is corrected much later in 4.10-rc8.I don't know how to locate
correction commit for the one below
$ git bisect bad
174cc7187e6f088942c8e74daa7baff7b44b33c9 is the first bad commit
commit 174cc7187e6f088942c8e74daa7baff7b44b33c9
Author: Lv Zheng <lv.zh...@intel.com>
Date: Wed Dec 14 15:04:25 2016 +0800
ACPICA: Tables: Back port acpi_get_table_with_size() and
early_acpi_os_unmap_memory() from Linux kernel
ACPICA commit cac6790954d4d752a083e6122220b8a22febcd07
This patch back ports Linux acpi_get_table_with_size() and
early_acpi_os_unmap_memory() into ACPICA upstream to reduce divergences.
The 2 APIs are used by Linux as table management APIs for long time, it
contains a hidden logic that during the early stage, the mapped tables
should be unmapped before the early stage ends.
During the early stage, tables are handled by the following sequence:
acpi_get_table_with_size();
parse the table
early_acpi_os_unmap_memory();
During the late stage, tables are handled by the following sequence:
acpi_get_table();
parse the table
Linux uses acpi_gbl_permanent_mmap to distinguish the early stage and the
late stage.
The reasoning of introducing acpi_get_table_with_size() is: ACPICA will
remember the early mapped pointer in acpi_get_table() and Linux isn't able
to
prevent ACPICA from using the wrong early mapped pointer during the late
stage as there is no API provided from ACPICA to be an inverse of
acpi_get_table() to forget the early mapped pointer.
But how ACPICA can work with the early/late stage requirement? Inside of
ACPICA, tables are ensured to be remained in "INSTALLED" state during the
early stage, and they are carefully not transitioned to "VALIDATED" state
until the late stage. So the same logic is in fact implemented inside of
ACPICA in a different way. The gap is only that the feature is not provided
to the OSPMs in an accessible external API style.
It then is possible to fix the gap by providing an inverse of
acpi_get_table() from ACPICA, so that the two Linux sequences can be
combined:
acpi_get_table();
parse the table
acpi_put_table();
In order to work easier with the current Linux code, acpi_get_table() and
acpi_put_table() is implemented in a usage counting based style:
1. When the usage count of the table is increased from 0 to 1, table is
mapped and .Pointer is set with the mapping address (VALIDATED);
2. When the usage count of the table is decreased from 1 to 0, .Pointer
is unset and the mapping address is unmapped (INVALIDATED).
So that we can deploy the new APIs to Linux with minimal effort by just
invoking acpi_get_table() in acpi_get_table_with_size() and invoking
acpi_put_table() in early_acpi_os_unmap_memory(). Lv Zheng.
Link: https://github.com/acpica/acpica/commit/cac67909
Signed-off-by: Lv Zheng <lv.zh...@intel.com>
Signed-off-by: Bob Moore <robert.mo...@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
:040000 040000 b675d430a498bccd8a019eda7e48d8fb09854f8b
720808399136a9d0b4e9b4e52439fea2414d8be4 M drivers
:040000 040000 b0b35ecad595dfe85ceb7d0defc0d018820a1498
2263f006f9f48d19afd5603e75cc6af3de5a3a61 M include
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https://bugs.launchpad.net/bugs/1822363
Title:
Booting hangs when USB 3.0 Etron EJ168 PCI card is detected
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