04 Aug, 2020
1 commit
-
The acpi_get_table() should be coupled with acpi_put_table() if
the mapped table is not used at runtime to release the table
mapping.In acpi_pcc_probe(), the PCCT table entries will be used as private
data for communication chan at runtime, but the table should be put
for error path.Signed-off-by: Hanjun Guo
Signed-off-by: Jassi Brar
31 May, 2020
1 commit
-
Fix the following sparse warning:
drivers/mailbox/pcc.c:571:24: warning: symbol 'pcc_mbox_driver' was not
declared. Should it be static?Reported-by: Hulk Robot
Signed-off-by: Jason Yan
Signed-off-by: Jassi Brar
31 May, 2019
1 commit
-
Based on 3 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version this program is distributed in the
hope that it will be useful but without any warranty without even
the implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more detailsthis program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version [author] [kishon] [vijay] [abraham]
[i] [kishon]@[ti] [com] this program is distributed in the hope that
it will be useful but without any warranty without even the implied
warranty of merchantability or fitness for a particular purpose see
the gnu general public license for more detailsthis program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version [author] [graeme] [gregory]
[gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
[kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
[hk] [hemahk]@[ti] [com] this program is distributed in the hope
that it will be useful but without any warranty without even the
implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more detailsextracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 1105 file(s).
Signed-off-by: Thomas Gleixner
Reviewed-by: Allison Randal
Reviewed-by: Richard Fontana
Reviewed-by: Kate Stewart
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman
05 Apr, 2019
1 commit
-
Parsing entries in an ACPI table had assumed a generic header
structure. There is no standard ACPI header, though, so less common
layouts with different field sizes required custom parsers to go through
their subtable entry list.Create the infrastructure for adding different table types so parsing
the entries array may be more reused for all ACPI system tables and
the common code doesn't need to be duplicated.Reviewed-by: Rafael J. Wysocki
Acked-by: Jonathan Cameron
Tested-by: Jonathan Cameron
Signed-off-by: Keith Busch
Tested-by: Brice Goglin
Signed-off-by: Greg Kroah-Hartman
10 Sep, 2018
1 commit
-
acpi_pcc_probe() calls acpi_table_parse_entries_array() but fails
to check for an error return. This in turn can result in calling
kcalloc() with a negative count as well as emitting the following
misleading erorr message:[ 2.642015] Could not allocate space for PCC mbox channels
Fixes: 8f8027c5f935 (mailbox: PCC: erroneous error message when parsing ACPI PCCT)
Signed-off-by: David Arcari
Reviewed-by: Al Stone
Cc: 4.18+ # 4.18+
Signed-off-by: Rafael J. Wysocki
13 Jun, 2018
1 commit
-
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:kzalloc(a * b, gfp)
with:
kcalloc(a * b, gfp)as well as handling cases of:
kzalloc(a * b * c, gfp)
with:
kzalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kzalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kzalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@(
kzalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kzalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@(
kzalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@(
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@- kzalloc
+ kcalloc
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@(
kzalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@(
kzalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@(
kzalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@(
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@(
kzalloc(sizeof(THING) * C2, ...)
|
kzalloc(sizeof(TYPE) * C2, ...)
|
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * E2
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- E1 * E2
+ E1, E2
, ...)
)Signed-off-by: Kees Cook
18 May, 2018
1 commit
-
There have been multiple reports of the following error message:
[ 0.068293] Error parsing PCC subspaces from PCCT
This error message is not correct. In multiple cases examined, the PCCT
(Platform Communications Channel Table) concerned is actually properly
constructed; the problem is that acpi_pcc_probe() which reads the PCCT
is making the assumption that the only valid PCCT is one that contains
subtables of one of two types: ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE or
ACPI_PCCT_TYPE_HW_REDUCED_TYPE2. The number of subtables of these
types are counted and as long as there is at least one of the desired
types, the acpi_pcc_probe() succeeds. When no subtables of these types
are found, regardless of whether or not any other subtable types are
present, the error mentioned above is reported.In the cases reported to me personally, the PCCT contains exactly one
subtable of type ACPI_PCCT_TYPE_GENERIC_SUBSPACE. The function
acpi_pcc_probe() does not count it as a valid subtable, so believes
there to be no valid subtables, and hence outputs the error message.An example of the PCCT being reported as erroneous yet perfectly fine
is the following:Signature : "PCCT"
Table Length : 0000006E
Revision : 05
Checksum : A9
Oem ID : "XXXXXX"
Oem Table ID : "XXXXX "
Oem Revision : 00002280
Asl Compiler ID : "XXXX"
Asl Compiler Revision : 00000002Flags (decoded below) : 00000001
Platform : 1
Reserved : 0000000000000000Subtable Type : 00 [Generic Communications Subspace]
Length : 3EReserved : 000000000000
Base Address : 00000000DCE43018
Address Length : 0000000000001000Doorbell Register : [Generic Address Structure]
Space ID : 01 [SystemIO]
Bit Width : 08
Bit Offset : 00
Encoded Access Width : 01 [Byte Access:8]
Address : 0000000000001842Preserve Mask : 00000000000000FD
Write Mask : 0000000000000002
Command Latency : 00001388
Maximum Access Rate : 00000000
Minimum Turnaround Time : 0000To fix this, we count up all of the possible subtable types for the
PCCT, and only report an error when there are none (which could mean
either no subtables, or no valid subtables), or there are too many.
We also change the logic so that if there is a valid subtable, we
do try to initialize it per the PCCT subtable contents. This is a
change in functionality; previously, the probe would have returned
right after the error message and would not have tried to use any
other subtable definition.Tested on my personal laptop which showed the error previously; the
error message no longer appears and the laptop appears to operate
normally.Signed-off-by: Al Stone
Reviewed-by: Prashanth Prakash
Signed-off-by: Rafael J. Wysocki
16 Nov, 2017
1 commit
-
Pull mailbox updates from Jassi Brar:
"Change to POLL api and fixes for FlexRM and OMAP driver.Summary:
- Core: Prefer ACK method over POLL, if both supported
- Test: use flag instead of special character
- FlexRM: Usual driver internal minor churn
- Omap: fix error path"
* tag 'mailbox-v4.15' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
mailbox/omap: unregister mbox class
mailbox: mailbox-test: don't rely on rx_buffer content to signal data ready
mailbox: reset txdone_method TXDONE_BY_POLL if client knows_txdone
mailbox: Build Broadcom FlexRM driver as loadable module for iProc SOCs
mailbox: bcm-flexrm-mailbox: Use common GPL comment header
mailbox: bcm-flexrm-mailbox: add depends on ARCH_BCM_IPROC
mailbox: bcm-flexrm-mailbox: Print ring number in errors and warnings
mailbox: bcm-flexrm-mailbox: Fix FlexRM ring flush sequence
14 Nov, 2017
1 commit
-
Currently the mailbox framework sets txdone_method to TXDONE_BY_POLL if
the controller sets txdone_by_poll. However some clients can have a
mechanism to do TXDONE_BY_ACK which they can specify by knows_txdone.
However, we endup setting both TXDONE_BY_POLL and TXDONE_BY_ACK in that
case. In such scenario, we may end up with below warnings as the tx
ticker is run both by mailbox framework and the client.WARNING: CPU: 1 PID: 0 at kernel/time/hrtimer.c:805 hrtimer_forward+0x88/0xd8
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.12.0-rc5 #242
Hardware name: ARM LTD ARM Juno Development Platform
task: ffff8009768ca700 task.stack: ffff8009768f8000
PC is at hrtimer_forward+0x88/0xd8
LR is at txdone_hrtimer+0xd4/0xf8
Call trace:
hrtimer_forward+0x88/0xd8
__hrtimer_run_queues+0xe4/0x158
hrtimer_interrupt+0xa4/0x220
arch_timer_handler_phys+0x30/0x40
handle_percpu_devid_irq+0x78/0x130
generic_handle_irq+0x24/0x38
__handle_domain_irq+0x5c/0xb8
gic_handle_irq+0x54/0xa8This patch fixes the issue by resetting TXDONE_BY_POLL if client has set
knows_txdone.Cc: Alexey Klimov
Signed-off-by: Sudeep Holla
Signed-off-by: Jassi Brar
09 Nov, 2017
1 commit
-
Move the MAX_PCC_SUBSPACES definition to acpi/pcc.h file in
preparation to add subspace ID support for cppc_acpi driver.Signed-off-by: George Cherian
Reviewed-by: Prashanth Prakash
Signed-off-by: Rafael J. Wysocki
10 Aug, 2017
1 commit
-
When booting on an ACPI enabled system that does not provide the
Platform Communications Channel Table (PCCT), the pcc mailbox driver
prints -[ 0.484261] PCCT header not found.
during probe before returning -ENODEV.
This message clutters the bootlog and doesn't provide any useful
information. Drop this message.Signed-off-by: Punit Agrawal
Acked-by: Alexey Klimov
Signed-off-by: Rafael J. Wysocki
26 Jul, 2017
1 commit
-
When PCCT is not available, kernel crashes as below when requests PCC
channel 0. This patch fixes this issue.[ 0.920454] PCCT header not found.
...
[ 8.031309] Unable to handle kernel NULL pointer dereference at virtual address 00000010
[ 8.031310] [0000000000000010] user address but active_mm is swapper
[ 8.031312] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 8.031313] Modules linked in:
[ 8.031316] CPU: 31 PID: 1 Comm: swapper/0 Tainted: G W 4.13.0-rc1 #18
[ 8.031317] Hardware name: AppliedMicro(R) 07/20/2017
[ 8.031318] task: ffff809ef3b08000 task.stack: ffff809ef3b10000
[ 8.031322] PC is at pcc_mbox_request_channel+0x8c/0x160
[ 8.031325] LR is at xgene_slimpro_i2c_probe+0x1c0/0x378
[ 8.031326] pc : [] lr : [] pstate: 00000045
[ 8.031327] sp : ffff809ef3b13bd0
[ 8.031327] x29: ffff809ef3b13bd0 x28: ffff000008ed90a0
[ 8.031329] x27: ffff000009091000 x26: ffff000008e50470
[ 8.031330] x25: ffff000008ed9100 x24: ffff809eefd9ac30
[ 8.031332] x23: 0000000000000000 x22: ffff0000090e3e10
[ 8.031333] x21: ffff0000090e3000 x20: 0000000000000000
[ 8.031335] x19: 0000000000000000 x18: 0000000000087ffc
[ 8.031336] x17: 2fe48d76a78303f0 x16: 0000000000087ffc
[ 8.031337] x15: ffff000000000000 x14: 0000000000000000
[ 8.031339] x13: 0000000000000000 x12: 0000000000000018
[ 8.031340] x11: 0000000000000018 x10: 0101010101010101
[ 8.031342] x9 : 0000000000000000 x8 : 7f7f7f7f7f7f7f7f
[ 8.031343] x7 : fefefefeff6b646d x6 : 0000008080808080
[ 8.031345] x5 : 0000000000000000 x4 : 0000000000000001
[ 8.031346] x3 : 0000000000000000 x2 : ffff000008819b64
[ 8.031348] x1 : 0000000000000000 x0 : 0000000000000000
...
[ 8.031393] Call trace:
[ 8.031394] Exception stack(0xffff809ef3b13a00 to 0xffff809ef3b13b30)
[ 8.031395] 3a00: 0000000000000000 0001000000000000 ffff809ef3b13bd0 ffff000008899450
[ 8.031397] 3a20: ffff809f7e1f9a10 ffff000008f60be0 0000000000000001 ffff809ef3b13b7c
[ 8.031398] 3a40: ffff809f7e1f9a10 0000000000000000 ffff000009091000 0000000000000003
[ 8.031399] 3a60: ffff000009091000 0000000000000003 ffff809ef3b13a80 ffff0000084e0794
[ 8.031400] 3a80: ffff809ef3b13a90 ffff00000850bb64 ffff809ef3b13ad0 ffff00000850bf34
[ 8.031402] 3aa0: 0000000000000000 0000000000000000 ffff000008819b64 0000000000000000
[ 8.031403] 3ac0: 0000000000000001 0000000000000000 0000008080808080 fefefefeff6b646d
[ 8.031404] 3ae0: 7f7f7f7f7f7f7f7f 0000000000000000 0101010101010101 0000000000000018
[ 8.031405] 3b00: 0000000000000018 0000000000000000 0000000000000000 ffff000000000000
[ 8.031406] 3b20: 0000000000087ffc 2fe48d76a78303f0
[ 8.031409] [] pcc_mbox_request_channel+0x8c/0x160
[ 8.031410] [] xgene_slimpro_i2c_probe+0x1c0/0x378
[ 8.031413] [] platform_drv_probe+0x50/0xbc
[ 8.031414] [] driver_probe_device+0x21c/0x2d0
[ 8.031416] [] __driver_attach+0xac/0xb0
[ 8.031417] [] bus_for_each_dev+0x58/0x98
[ 8.031418] [] driver_attach+0x20/0x28
[ 8.031419] [] bus_add_driver+0x1c8/0x22c
[ 8.031421] [] driver_register+0x60/0xf4
[ 8.031422] [] __platform_driver_register+0x4c/0x54
[ 8.031425] [] xgene_slimpro_i2c_driver_init+0x18/0x20
[ 8.031426] [] do_one_initcall+0x38/0x124
[ 8.031429] [] kernel_init_freeable+0x190/0x22c
[ 8.031431] [] kernel_init+0x10/0xfc
[ 8.031432] [] ret_from_fork+0x10/0x50
[ 8.031434] Code: cb030e63 8b030013 b140067f 54fffda8 (f9400a61)
[ 8.031448] ---[ end trace 14eb48a4e1e1f9fb ]---Signed-off-by: Hoan Tran
Acked-by: Prashanth Prakash
Signed-off-by: Rafael J. Wysocki
12 Jun, 2017
1 commit
-
ACPICA commit e7b817e3c405a4fb9ae9ee7ae4992b8c1f20d284
Extended PCC Subspaces (types 3 and 4)
Link: https://github.com/acpica/acpica/commit/e7b817e3
Signed-off-by: David E. Box
Signed-off-by: Bob Moore
Signed-off-by: Lv Zheng
Signed-off-by: Rafael J. Wysocki
22 Dec, 2016
1 commit
-
* acpica:
ACPI / osl: Remove deprecated acpi_get_table_with_size()/early_acpi_os_unmap_memory()
ACPI / osl: Remove acpi_get_table_with_size()/early_acpi_os_unmap_memory() users
ACPICA: Tables: Allow FADT to be customized with virtual address
ACPICA: Tables: Back port acpi_get_table_with_size() and early_acpi_os_unmap_memory() from Linux kernel* acpi-scan:
ACPI: do not warn if _BQC does not exist
21 Dec, 2016
1 commit
-
This patch removes the users of the deprectated APIs:
acpi_get_table_with_size()
early_acpi_os_unmap_memory()
The following APIs should be used instead of:
acpi_get_table()
acpi_put_table()The deprecated APIs are invented to be a replacement of acpi_get_table()
during the early stage so that the early mapped pointer will not be stored
in ACPICA core and thus the late stage acpi_get_table() won't return a
wrong pointer. The mapping size is returned just because it is required by
early_acpi_os_unmap_memory() to unmap the pointer during early stage.But as the mapping size equals to the acpi_table_header.length
(see acpi_tb_init_table_descriptor() and acpi_tb_validate_table()), when
such a convenient result is returned, driver code will start to use it
instead of accessing acpi_table_header to obtain the length.Thus this patch cleans up the drivers by replacing returned table size with
acpi_table_header.length, and should be a no-op.Reported-by: Dan Williams
Signed-off-by: Lv Zheng
Signed-off-by: Rafael J. Wysocki
15 Nov, 2016
1 commit
-
This patch fixes the lockdep warning below
DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1 at linux-next/kernel/locking/lockdep.c:2876 lockdep_trace_alloc+0xe0/0xf0
Modules linked in:CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.8.0-11756-g86c5152 #46
...
Call trace:
Exception stack(0xffff8007da837890 to 0xffff8007da8379c0)
7880: ffff8007da834000 0001000000000000
78a0: ffff8007da837a70 ffff0000081111a0 00000000600000c5 000000000000003d
78c0: 9374bc6a7f3c7832 0000000000381878 ffff000009db7ab8 000000000000002f
78e0: ffff00000811aabc ffff000008be2548 ffff8007da837990 ffff00000811adf8
7900: ffff8007da834000 00000000024080c0 00000000000000c0 ffff000009021000
7920: 0000000000000000 0000000000000000 ffff000008c8f7c8 ffff8007da579810
7940: 000000000000002f ffff8007da858000 0000000000000000 0000000000000001
7960: 0000000000000001 0000000000000000 ffff00000811a468 0000000000000002
7980: 656c62617369645f 0000000000038187 00000000000000ee ffff8007da837850
79a0: ffff000009db50c0 ffff000009db569d 0000000000000006 ffff000089db568f
[] lockdep_trace_alloc+0xe0/0xf0
[] __kmalloc_track_caller+0x50/0x250
[] devres_alloc_node+0x28/0x60
[] devm_request_threaded_irq+0x50/0xe0
[] pcc_mbox_request_channel+0x110/0x170
[] acpi_cppc_processor_probe+0x264/0x414
[] __acpi_processor_start+0x28/0xa0
[] acpi_processor_start+0x44/0x54
[] driver_probe_device+0x1fc/0x2b0
[] __driver_attach+0xb4/0xc0
[] bus_for_each_dev+0x5c/0xa0
[] driver_attach+0x20/0x30
[] bus_add_driver+0x110/0x230
[] driver_register+0x60/0x100
[] acpi_processor_driver_init+0x2c/0xb0
[] do_one_initcall+0x38/0x130
[] kernel_init_freeable+0x210/0x2b4
[] kernel_init+0x10/0x110
[] ret_from_fork+0x10/0x50It's because the spinlock inside pcc_mbox_request_channel() is
kept too long. This patch releases spinlock before request_irq()
and free_irq() to fix this issue as spinlock is only needed to
protect the channel data.Signed-off-by: Hoan Tran
Reviewed-by: Prashanth Prakash
Signed-off-by: Rafael J. Wysocki
31 Aug, 2016
1 commit
-
ACPI 6.1 has a PCC HW-Reduced Communication Subspace type 2 intended for
use on HW-Reduce ACPI Platform, which requires read-modify-write sequence
to acknowledge doorbell interrupt. This patch provides the implementation
for the Communication Subspace Type 2.Signed-off-by: Hoan Tran
Reviewed-by: Prashanth Prakash
Signed-off-by: Rafael J. Wysocki
09 Apr, 2016
1 commit
-
* pm-cpufreq:
cpufreq: dt: Drop stale comment
cpufreq: intel_pstate: Documenation for structures
cpufreq: intel_pstate: fix inconsistency in setting policy limits
intel_pstate: Avoid extra invocation of intel_pstate_sample()
intel_pstate: Do not set utilization update hook too early* pm-cpuidle:
intel_idle: Add KBL support
intel_idle: Add SKX support
intel_idle: Clean up all registered devices on exit.
intel_idle: Propagate hot plug errors.
intel_idle: Don't overreact to a cpuidle registration failure.
intel_idle: Setup the timer broadcast only on successful driver load.
intel_idle: Avoid a double free of the per-CPU data.
intel_idle: Fix dangling registration on error path.
intel_idle: Fix deallocation order on the driver exit path.
intel_idle: Remove redundant initialization calls.
intel_idle: Fix a helper function's return value.
intel_idle: remove useless return from void function.* acpi-cppc:
mailbox: pcc: Don't access an unmapped memory address space
07 Apr, 2016
1 commit
-
The acpi_pcc_probe() may end up accessing memory outside of the PCCT
table space causing the kernel panic(). Increment the pcct_entry
pointer after parsing 'HW-reduced Communications Subspace' to fix
the problem. This change also enables the parsing of subtable at
index 0.Signed-off-by: Shanker Donthineni
Acked-by: Ashwin Chaugule
Signed-off-by: Rafael J. Wysocki
14 Mar, 2016
1 commit
-
* acpi-processor:
ACPI / sleep: move acpi_processor_sleep to sleep.c
ACPI / processor : add support for ACPI0010 processor container
ACPI / processor_idle: replace PREFIX with pr_fmt* acpi-cppc:
ACPI / CPPC: use MRTT/MPAR to decide if/when a req can be sent
ACPI / CPPC: replace writeX/readX to PCC with relaxed version
mailbox: pcc: optimized pcc_send_data
ACPI / CPPC: optimized cpc_read and cpc_write
ACPI / CPPC: Optimize PCC Read Write operations
10 Mar, 2016
1 commit
-
pcc_send_data() can be invoked during the execution of performance
critical code as in cppc_cpufreq driver. With acpi_* APIs, the
doorbell register accessed in pcc_send_data() if present in system
memory will be searched (in cached virt to phys addr mapping),
mapped, read/written and then unmapped. These operations take
significant amount of time.This patch maps the performance critical doorbell register
during init and then reads/writes to it directly using the
mapped virtual address. This patch + similar changes to CPPC
acpi driver reduce the time per freq. transition from around
200us to about 20us for the CPPC cpufreq driverSigned-off-by: Prashanth Prakash
Acked-by: Ashwin Chaugule
Signed-off-by: Rafael J. Wysocki
02 Feb, 2016
1 commit
-
This patch fixes the calculation of pcc_chan for non-zero id.
After the compiler ignores the (unsigned long) cast the
pcc_mbox_channels pointer is type-cast and then the type-cast
offset is added which results in address outside of the range
leading to the kernel crashing.We might add braces and make it:
pcc_chan = (struct mbox_chan *)
((unsigned long) pcc_mbox_channels +
(id * sizeof(*pcc_chan)));but let's go with array approach here and use id as index.
Tested on Juno board.
Signed-off-by: Alexey Klimov
Acked-by: Sudeep Holla
Acked-by: Ashwin Chaugule
Signed-off-by: Jassi Brar
16 Oct, 2015
1 commit
-
get_pcc_channel() does not return NULL on error it returns the error code
in ERR_PTR, but we have been checking it for NULL.Signed-off-by: Sudip Mukherjee
25 Aug, 2015
1 commit
-
This change initializes the PCC Mailbox earlier than
the ACPI processor driver. This enables drivers introduced
in follow up patches (e.g. CPPC) to be probed via the ACPI
processor driver interface. The CPPC probe requires the PCC
channel to be initialized for it to query each CPUs performance
capabilities.Signed-off-by: Ashwin Chaugule
Reviewed-by: Al Stone
Signed-off-by: Rafael J. Wysocki
12 May, 2015
1 commit
-
The mailbox controller's channel ops ought to be read-only. Update
all the mailbox drivers to make their mbox_chan_ops const as well.Signed-off-by: Andrew Bresticker
Cc: Ashwin Chaugule
Cc: Ley Foon Tan
Acked-by: Suman Anna
Signed-off-by: Jassi Brar
04 Mar, 2015
1 commit
-
Previously the PCC driver depended on the client
side to map the communication space base address. This region
was was then used in the PCC driver and the client side.
The client side used this region to read and write its data
and the PCC driver used it to only write the PCC command.
Removing this split simplifies the PCC driver a lot. This patch
moves all communication region read/writes to the client side.
The PCC clients can now drive the PCC mailbox controller via the
mbox_client_txdone() method.Signed-off-by: Ashwin Chaugule
12 Feb, 2015
1 commit
-
Pull mailbox framework updates from Jassi Brar.
* 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
mailbox: Add Altera mailbox driver
mailbox: check for bit set before polling
Mailbox: Fix return value check in pcc_init()
06 Feb, 2015
1 commit
-
In case of error, the function platform_create_bundle() returns
ERR_PTR() and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().Signed-off-by: Wei Yongjun
05 Feb, 2015
1 commit
-
pcc_init() uses pr_err() to print two messages that are really debug
and not interesting to users. Replace those pr_err() with pr_debug().Reported-by: Cristian
Signed-off-by: Rafael J. Wysocki
27 Nov, 2014
1 commit
-
ACPI 5.0+ spec defines a generic mode of communication
between the OS and a platform such as the BMC. This medium
(PCC) is typically used by CPPC (ACPI CPU Performance management),
RAS (ACPI reliability protocol) and MPST (ACPI Memory power
states).This patch adds PCC support as a Mailbox Controller. As of
ACPI v5.1 there is no provision for clients to lookup mailbox
controllers in a way that Linux expects. e.g. in DT the clients
can list the mailboxes they can associate with in the DT binding
and then provide a unique index to lookup a channel within a mailbox.
Since the ACPI spec doesn't have anything similar, we introduce a
mailbox controller specific API so that when the client calls it,
we know to lookup in the context of a specific controller. This
also helps in keeping a consistent interface across DT and ACPI
for such drivers.This patch implements basic PCC support using the ACPI v5.1
structures. IRQ mode support will be provided as follow up patches.Signed-off-by: Ashwin Chaugule
Reviewed-by: Mark Brown
Reviewed-by: Arnd Bergmann
Signed-off-by: Jassi Brar