For power gating entry we write hbm pg entry request command and
then we set pg register
For power gating exit we clear pg register and wait for exit request
hbm command.

Exit power gating request might also be initiated by the firmware
w/o explicit driver request

The power gating state is tracked by pg_state member of me_hw
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Since the runtime pm and the internal power gating
cannot be in complete sync in regards to I/O
operations, we need to expose the device
hardware internal power gating state to mei layer

2. We add pg_state handler that translate the hw
internal pg state to mei layer

2. We add power gating event variable to keep
power track of power gating transitions
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Reviewed-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Enable power gating isolation only if hw and fw support it.
This is indicated by ME_PGIC_HRA bit in ME_CSR_HA register
and on HBM protocol version.

The information is exported to MEI layer through
new pg_is_enabled hw op.
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add entry and exit power gating isolation register
write handler.
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

LPT devices have internal power gating handled
through registers and hbm calls
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add send message functions and receive dispatch stubs
for power gating isolation hbm protocol.

The protocol consist of requests for entering and exiting
the power gating isolation state and their responses.
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Ignore client writing state during cb completion to fix a memory
leak.

When moving cbs to the completion list we should not look at
writing_state as this state can be already overwritten by next
write, the fact that a cb is on the write waiting list means
that it was already written to the HW and we can safely complete it.

Same pays for wait in poll handler, we do not have to check the state
wake is done after completion list processing.

Cc: stable@vger.kernel.org
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

NM and SPS  FW types that may run on ME device on server platforms
do not have valid MEI/HECI interface and driver should not
be bound to it as this might lead to system hung.
In practice not all BIOSes effectively hide such devices from the
OS and in some cases it is not possible.

We determine FW type by examining Host FW status registers in order to
unbind the driver.
In this patch we are adding check for ME on Cougar Point, Lynx Point
Devices

Cc: stable <stable@vger.kernel.org> # 3.10+
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Tested-by: NNikola Ciprich <nikola.ciprich@linuxbox.cz>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Using struct pci_device_id is preferred  over
deprecated DEFINE_PCI_DEVICE_TABLE macro
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

ERROR: else should follow close brace '}'
+	}
+	else {
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Fix checkpatch error
return is not a function, parentheses are not required
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

use cl_dbg for debug log messages in cl context

this also removes checkpatch warning:
quoted string split across lines
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Fix checkpatch warining:
Unnecessary space after function pointer name
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Consistently display error on possible copy_from/to_user failures
use dev_dbg  so it cannot be abused to flood the kernel log
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

we are using dev_ logging facility so we don't need pr_fmt macros
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Reviewed-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Remove includes of me-hw.h and me-hw-regs.h headers from
the mei generic code.
The mei layer should not depend on hw specific headers
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Write callbacks are released on the write completed path but
when file handler is closed before the writes are
completed those are left dangling on write and write_waiting queues.

We add mei_io_list_free function to perform this task

Also move static functions to client.c form client.h

Cc: stable <stable@vger.kernel.org> # 3.11+
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

There is a race in ME hardware between data copy for host and interrupt
delivery. An interrupt can be delivered prior to whole data copied for the
host to read but rather then going trough the reset we just merely need to
wait for the next interrupt.

The bug is visible in read/write stress with multiple connections per client

This is a regression caused as a side effect of the commit:
commit 544f9460
mei: do not run reset flow from the interrupt thread
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Cc: stable <stable@vger.kernel.org> # 3.14
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

1. Delete cb from list before freeing it
2. Fix missed break that leads to
switch case fall-through and BUG invocation.

Regression from:
commit 6bb948c9
mei: get rid of ext_msg
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

While running Documentation/watchdog/src/watchdog-simple.c
and quiting by Ctrl-C, fallowing error is displayed:
mei_me 0000:00:16.0: wd: stop failed to complete ret=-512.

The whatchdog core framework is not able to propagate
-ESYSRESTART or -EINTR. Also There is no much sense in
restarting the close system call so instead of using
wait_event_interruptible_timeout we can use wait_event_timeout
with reasonable 10 msecs timeout.
Reported-by: NPrarit Bhargava <prarit@redhat.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add reduce credits to wd_send to remove code
repetition and simplify error handling
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

1. Propagate ENOTTY  to user space if the client is not present
in the system
2. Use ETIME consistently on timeouts
3. Return EIO on write failures
4. Return ENODEV on recoverable device failures such as resets
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Since txe use doorbell and not circular buffer
we have to cheat in write slot counting, txe always consume all the
slots upon write. In order for it to work we need to track
slots using mei_hbuf_empty_slots() instead of tracking it in mei layer
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

A client has to acquire host buffer
before writing, we add lock like wrapper
to replace the code snippet

if (dev->hbuf_is_ready)
        dev->hbuf_is_ready = false;
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

We currently include <linux/irqreturn.h> in <linux/pci.h>, but I'm about to
remove that from linux/pci.h, so add explicit includes where needed.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NTomas Winkler <tomas.winkler@intel.com>

In mei_cl_read_start(), if it fails to send flow control request, it
will release "cl->read_cb" but forget to set pointer to NULL, leaving
"cl->read_cb" still pointing to random memory, next time this client is
operated like mei_release(), it has chance to refer to this wrong pointer.

Fixes:  PANIC at kfree in mei_release()

[228781.826904] Call Trace:
[228781.829737]  [<c16249b8>] ? mei_cl_unlink+0x48/0xa0
[228781.835283]  [<c1624487>] mei_io_cb_free+0x17/0x30
[228781.840733]  [<c16265d8>] mei_release+0xa8/0x180
[228781.845989]  [<c135c610>] ? __fsnotify_parent+0xa0/0xf0
[228781.851925]  [<c1325a69>] __fput+0xd9/0x200
[228781.856696]  [<c1325b9d>] ____fput+0xd/0x10
[228781.861467]  [<c125cae1>] task_work_run+0x81/0xb0
[228781.866821]  [<c1242e53>] do_exit+0x283/0xa00
[228781.871786]  [<c1a82b36>] ? kprobe_flush_task+0x66/0xc0
[228781.877722]  [<c124eeb8>] ? __dequeue_signal+0x18/0x1a0
[228781.883657]  [<c124f072>] ? dequeue_signal+0x32/0x190
[228781.889397]  [<c1243744>] do_group_exit+0x34/0xa0
[228781.894750]  [<c12517b6>] get_signal_to_deliver+0x206/0x610
[228781.901075]  [<c12018d8>] do_signal+0x38/0x100
[228781.906136]  [<c1626d1c>] ? mei_read+0x42c/0x4e0
[228781.911393]  [<c12600a0>] ? wake_up_bit+0x30/0x30
[228781.916745]  [<c16268f0>] ? mei_poll+0x120/0x120
[228781.922001]  [<c1324be9>] ? vfs_read+0x89/0x160
[228781.927158]  [<c16268f0>] ? mei_poll+0x120/0x120
[228781.932414]  [<c133ca34>] ? fget_light+0x44/0xe0
[228781.937670]  [<c1324e58>] ? SyS_read+0x68/0x80
[228781.942730]  [<c12019f5>] do_notify_resume+0x55/0x70
[228781.948376]  [<c1a7de5d>] work_notifysig+0x29/0x30
[228781.953827]  [<c1a70000>] ? bad_area+0x5/0x3e

Cc: stable <stable@vger.kernel.org> # 3.9+
Signed-off-by: NChao Bi <chao.bi@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

PCI suspend resume callbacks should be defined
under CONFIG_PM_SLEEP
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This will eliminate compilation warning:

drivers/misc/mei/pci-me.c:303:12: warning: mei_me_pci_suspend defined but not used [-Wunused-function]
static int mei_me_pci_suspend(struct device *device)
drivers/misc/mei/pci-me.c:323:12: warning: mei_me_pci_resume defined but not used [-Wunused-function]
static int mei_me_pci_resume(struct device *device)
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

We can use simply list_for_each_entry if there is no
entry removal
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

We already have a helper to find me client by id, let's
use it in all relevant places.
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Drop not-very-useful check and with this
fix read on index that can be after array end.
Cleanup search function as byproduct.
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Connect wd and amthif through regular mei_cl_connect API
as there is no reason to connect in asynchronous mode.
Also use mei_cl_is_connected in order to protect flows
instead of depending on wd_pending and amthif_timer

Now we can remove all the special handling in hbm layer
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

1. Return -ENOTTY on client connect if the requested client was not found
 on the enumeration list or the client was internally disabled, in the later
 case FW will return NOT_FOUND.
2. Return -EBUSY if the client cannot be connected because of resource
 contention
3. Change response status enum to have MEI_CL_ prefix
4. Add function to translate response status to a string
for more readable logging
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

When stopping the MEI, we should remove and potentially unregister
all bus devices queued on the mei_dev linked list.
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Use more standard message writing for
oob data.
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This operation actually only support connection
and not a generic ioctl
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Kconfig is not transitive so INTEL_ME_TXE has to depend
on WATCHDOG_CORE as well

ERROR: "watchdog_unregister_device" [drivers/misc/mei/mei.ko] undefined!
ERROR: "watchdog_register_device" [drivers/misc/mei/mei.ko] undefined!
Reported-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

None of these files are actually using any __init type directives
and hence don't need to include <linux/init.h>.  Most are just a
left over from __devinit and __cpuinit removal, or simply due to
code getting copied from one driver to the next.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Export active connection state to debugfs
The information displayed is [me,host] id pair,
client connection state, and client's read and write states
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Reviewed-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>