linux-toradex.git/drivers/acpi/cppc_acpi.c, branch v4.14-rc5

scripts/spelling.txt: add regsiter -> register spelling mistake

2017-05-09T00:15:13+00:00

This typo is quite common.  Fix it and add it to the spelling file so
that checkpatch catches it earlier.

Link: http://lkml.kernel.org/r/20170317011131.6881-2-sboyd@codeaurora.org
Signed-off-by: Stephen Boyd 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ACPI / CPPC: add sysfs entries for CPPC perf capabilities

2017-04-18T21:37:50+00:00

Computed delivered performance using CPPC feedback counters are in the
CPPC abstract scale, whereas cppc_cpufreq driver operates in KHz scale.
Exposing the CPPC performance capabilities (highest,lowest, nominal,
lowest non-linear) will allow userspace to figure out the conversion
factor from CPPC abstract scale to KHz.

Also rename ctr_wrap_time to wraparound_time so that show_cppc_data()
macro will work with it.

Signed-off-by: Prashanth Prakash 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Read lowest nonlinear perf in cppc_get_perf_caps()

2017-04-18T21:37:49+00:00

Read lowest non linear perf in cppc_get_perf_caps so that it can be exposed
via sysfs to the usespace. Lowest non linear perf is the lowest performance
level at which nonlinear power savings are achieved.

Signed-off-by: Prashanth Prakash 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Fix per-CPU pointer management in acpi_cppc_processor_probe()

2016-12-12T22:52:34+00:00

Fix a possible use-after-free scenario in acpi_cppc_processor_probe()
that can happen if the function returns without cleaning up the
per-CPU pointer set by it previously.

Reported-by: Sebastian Andrzej Siewior 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Fix crash in acpi_cppc_processor_exit()

2016-12-12T22:51:36+00:00

First I had crashed what I bisected down to de966cf4a4fa (sched/x86: Change
CONFIG_SCHED_ITMT to CONFIG_SCHED_MC_PRIO) because it made SCHED_ITMT the
default.

Then I run another bisect round and got here with the same backtrace:

|BUG: unable to handle kernel NULL pointer dereference at           (null)
|IP: [] acpi_cppc_processor_exit+0x40/0x60
|PGD 0 [    0.577616]
|Oops: 0000 [#1] SMP
|Modules linked in:
|CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc6-00146-g17669006adf6 #51
|task: ffff88003f878000 task.stack: ffffc90000008000
|RIP: 0010:[]  [] acpi_cppc_processor_exit+0x40/0x60
|RSP: 0000:ffffc9000000bd48  EFLAGS: 00010296
|RAX: 00000000000137e0 RBX: 0000000000000000 RCX: 0000000000000001
|RDX: ffff88003fc00000 RSI: 0000000000000000 RDI: ffff88003fbca130
|RBP: ffffc9000000bd60 R08: 0000000000000514 R09: 0000000000000000
|R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002
|R13: 0000000000000020 R14: ffffffff8167cb00 R15: 0000000000000000
|FS:  0000000000000000(0000) GS:ffff88003fcc0000(0000) knlGS:0000000000000000
|CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
|CR2: 0000000000000000 CR3: 0000000001618000 CR4: 00000000000406e0
|Stack:
| ffff88003f939848 ffff88003fbca130 0000000000000001 ffffc9000000bd80
| ffffffff812a4ccb ffff88003fc0cee8 0000000000000000 ffffc9000000bdb8
| ffffffff812dc20d ffff88003fc0cee8 ffffffff8167cb00 ffff88003fc0cf48
|Call Trace:
| [] acpi_processor_stop+0xb2/0xc5
| [] driver_probe_device+0x14d/0x2f0
| [] __driver_attach+0x6e/0x90
| [] bus_for_each_dev+0x54/0x90
| [] driver_attach+0x19/0x20
| [] bus_add_driver+0xe6/0x200
| [] driver_register+0x83/0xc0
| [] acpi_processor_driver_init+0x20/0x94
| [] do_one_initcall+0x97/0x180
| [] kernel_init_freeable+0x112/0x1a6
| [] kernel_init+0x9/0xf0
| [] ret_from_fork+0x25/0x30
|Code: 02 00 00 00 48 8b 14 d5 e0 c3 55 81 48 8b 1c 02 4c 8d 6b 20 eb 15 49 8b 7d 00 48 85 ff 74 05 e8 39 8c d9 ff 41 ff c4 49 83 c5 20 <44> 3b 23 72 e6 48 8d bb a0 02 00 00 e8 b1 6f f9 ff 48 89 df e8
|RIP  [] acpi_cppc_processor_exit+0x40/0x60
| RSP 
|CR2: 0000000000000000
|---[ end trace 917a625107b09711 ]---

Fix it.

Fixes: 17669006adf6 (cpufreq/intel_pstate: Use CPPC to get max performance)
Signed-off-by: Sebastian Andrzej Siewior 
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: set an error code on probe error path

2016-11-30T22:16:31+00:00

We should return -EINVAL (instead of 0) if get_cpu_device() fails.

Fixes: 158c998ea44b (ACPI / CPPC: add sysfs support to compute delivered performance)
Signed-off-by: Dan Carpenter 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Support PCC with interrupt flag

2016-09-16T23:14:24+00:00

For PCC mailbox with interrupt flag, CPPC should call mbox_chan_txdone()
function to notify the mailbox framework about TX completion.

Signed-off-by: Hoan Tran 
Reviewed-by: Prashanth Prakash 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Add prefix cppc to cpudata structure name

2016-09-08T21:02:15+00:00

Since struct cpudata is defined in a header file, add prefix cppc_ to
make it not a generic name. Otherwise it causes compile issue in locally
define structure with the same name.

Signed-off-by: Srinivas Pandruvada 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Add support for functional fixed hardware address

2016-09-08T21:02:14+00:00

The CPPC registers can also be accessed via functional fixed hardware
addresse(FFH) in X86. Add support by modifying cpc_read and cpc_write to
be able to read/write MSRs on x86 platform on per cpu basis.
Also with this change, acpi_cppc_processor_probe doesn't bail out if
address space id is not equal to PCC or memory address space and FFH
is supported on the system.

Signed-off-by: Srinivas Pandruvada 
Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: check for error bit in PCC status field

2016-08-30T23:02:34+00:00

PCC status field exposes an error bit(2) to indicate any errors during
the execution of last comamnd. This patch checks the error bit before
notifying success/failure to the cpufreq driver.

Signed-off-by: Prashanth Prakash 
Signed-off-by: Rafael J. Wysocki