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commit 33cd7123ac0ba5360656ae27db453de5b9aa711f upstream
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+0x54/0xa8
This patch fixes the issue by resetting TXDONE_BY_POLL if client has set
knows_txdone.
Cc: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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 <punit.agrawal@arm.com>
Acked-by: Alexey Klimov <alexey.klimov@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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 : [<ffff000008899450>] lr : [<ffff000008819dac>] 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] [<ffff000008899450>] pcc_mbox_request_channel+0x8c/0x160
[ 8.031410] [<ffff000008819dac>] xgene_slimpro_i2c_probe+0x1c0/0x378
[ 8.031413] [<ffff0000085e84dc>] platform_drv_probe+0x50/0xbc
[ 8.031414] [<ffff0000085e68a4>] driver_probe_device+0x21c/0x2d0
[ 8.031416] [<ffff0000085e6a04>] __driver_attach+0xac/0xb0
[ 8.031417] [<ffff0000085e4a78>] bus_for_each_dev+0x58/0x98
[ 8.031418] [<ffff0000085e61e4>] driver_attach+0x20/0x28
[ 8.031419] [<ffff0000085e5e0c>] bus_add_driver+0x1c8/0x22c
[ 8.031421] [<ffff0000085e7324>] driver_register+0x60/0xf4
[ 8.031422] [<ffff0000085e8420>] __platform_driver_register+0x4c/0x54
[ 8.031425] [<ffff000008e96dd0>] xgene_slimpro_i2c_driver_init+0x18/0x20
[ 8.031426] [<ffff000008083144>] do_one_initcall+0x38/0x124
[ 8.031429] [<ffff000008e50d0c>] kernel_init_freeable+0x190/0x22c
[ 8.031431] [<ffff0000089eac30>] kernel_init+0x10/0xfc
[ 8.031432] [<ffff000008082ec0>] ret_from_fork+0x10/0x50
[ 8.031434] Code: cb030e63 8b030013 b140067f 54fffda8 (f9400a61)
[ 8.031448] ---[ end trace 14eb48a4e1e1f9fb ]---
Signed-off-by: Hoan Tran <hotran@apm.com>
Acked-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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ACPICA commit e7b817e3c405a4fb9ae9ee7ae4992b8c1f20d284
Extended PCC Subspaces (types 3 and 4)
Link: https://github.com/acpica/acpica/commit/e7b817e3
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* 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
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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 <dan.j.williams@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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
[<ffff0000081111a0>] lockdep_trace_alloc+0xe0/0xf0
[<ffff0000081f4950>] __kmalloc_track_caller+0x50/0x250
[<ffff00000857c088>] devres_alloc_node+0x28/0x60
[<ffff0000081220e0>] devm_request_threaded_irq+0x50/0xe0
[<ffff0000087e6220>] pcc_mbox_request_channel+0x110/0x170
[<ffff0000084b2660>] acpi_cppc_processor_probe+0x264/0x414
[<ffff0000084ae9f4>] __acpi_processor_start+0x28/0xa0
[<ffff0000084aeab0>] acpi_processor_start+0x44/0x54
[<ffff00000857897c>] driver_probe_device+0x1fc/0x2b0
[<ffff000008578ae4>] __driver_attach+0xb4/0xc0
[<ffff00000857683c>] bus_for_each_dev+0x5c/0xa0
[<ffff000008578110>] driver_attach+0x20/0x30
[<ffff000008577c20>] bus_add_driver+0x110/0x230
[<ffff000008579320>] driver_register+0x60/0x100
[<ffff000008d478b8>] acpi_processor_driver_init+0x2c/0xb0
[<ffff000008083168>] do_one_initcall+0x38/0x130
[<ffff000008d20d6c>] kernel_init_freeable+0x210/0x2b4
[<ffff000008945d90>] kernel_init+0x10/0x110
[<ffff000008082e80>] ret_from_fork+0x10/0x50
It'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 <hotran@apm.com>
Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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 <hotran@apm.com>
Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* 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
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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 <shankerd@codeaurora.org>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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* 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
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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 driver
Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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 <alexey.klimov@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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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 <sudip@vectorindia.org>
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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 <ashwin.chaugule@linaro.org>
Reviewed-by: Al Stone <al.stone@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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 <abrestic@chromium.org>
Cc: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Cc: Ley Foon Tan <lftan@altera.com>
Acked-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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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 <ashwin.chaugule@linaro.org>
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git://git.linaro.org/landing-teams/working/fujitsu/integration
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()
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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 <yongjun_wei@trendmicro.com.cn>
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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 <caravena@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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 <ashwin.chaugule@linaro.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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Sudeep Holla
Punit Agrawal
Hoan Tran
David E. Box
Rafael J. Wysocki
Lv Zheng
Shanker Donthineni
Prakash, Prashanth
Alexey Klimov
Sudip Mukherjee
Ashwin Chaugule
Andrew Bresticker
Linus Torvalds
Wei Yongjun