kernel/arch/powerpc/include/asm/opal.h, branch linux-5.2.y

powerpc/xive: Fix bogus error code returned by OPAL

2019-10-01T07:01:36Z

commit 6ccb4ac2bf8a35c694ead92f8ac5530a16e8f2c8 upstream. There's a bug in skiboot that causes the OPAL_XIVE_ALLOCATE_IRQ call to return the 32-bit value 0xffffffff when OPAL has run out of IRQs. Unfortunatelty, OPAL return values are signed 64-bit entities and errors are supposed to be negative. If that happens, the linux code confusingly treats 0xffffffff as a valid IRQ number and panics at some point. A fix was recently merged in skiboot: e97391ae2bb5 ("xive: fix return value of opal_xive_allocate_irq()") but we need a workaround anyway to support older skiboots already in the field. Internally convert 0xffffffff to OPAL_RESOURCE which is the usual error returned upon resource exhaustion. Cc: stable@vger.kernel.org # v4.12+ Signed-off-by: Greg Kurz Reviewed-by: Cédric Le Goater Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/156821713818.1985334.14123187368108582810.stgit@bahia.lan Signed-off-by: Greg Kroah-Hartman

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32Z

Based on 1 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

powerpc/hmi: Fix kernel hang when TB is in error state.

2019-05-02T16:54:57Z

On TOD/TB errors timebase register stops/freezes until HMI error recovery gets TOD/TB back into running state. On successful recovery, TB starts running again and udelay() that relies on TB value continues to function properly. But in case when HMI fails to recover from TOD/TB errors, the TB register stay freezed. With TB not running the __delay() function keeps looping and never return. If __delay() is called while in panic path then system hangs and never reboots after panic. Signed-off-by: Mahesh Salgaonkar Signed-off-by: Michael Ellerman

powerpc/xive: add OPAL extensions for the XIVE native exploitation support

2019-04-11T05:31:41Z

The support for XIVE native exploitation mode in Linux/KVM needs a couple more OPAL calls to get and set the state of the XIVE internal structures being used by a sPAPR guest. Signed-off-by: Cédric Le Goater Reviewed-by: David Gibson Signed-off-by: Michael Ellerman

powerpc/powernv: Move opal_power_control_init() call in opal_init().

2018-12-21T00:32:49Z

opal_power_control_init() depends on opal message notifier to be initialized, which is done in opal_init()->opal_message_init(). But both these initialization are called through machine initcalls and it all depends on in which order they being called. So far these are called in correct order (may be we got lucky) and never saw any issue. But it is clearer to control initialization order explicitly by moving opal_power_control_init() into opal_init(). Signed-off-by: Mahesh Salgaonkar Signed-off-by: Michael Ellerman

powerpc/powernv: provide a console flush operation for opal hvc driver

2018-08-20T10:19:54Z

Provide the flush hv_op for the opal hvc driver. This will flush the firmware console buffers without spinning with interrupts disabled. Cc: Benjamin Herrenschmidt Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

crypto/nx: Initialize 842 high and normal RxFIFO control registers

2018-08-07T14:32:34Z

NX increments readOffset by FIFO size in receive FIFO control register when CRB is read. But the index in RxFIFO has to match with the corresponding entry in FIFO maintained by VAS in kernel. Otherwise NX may be processing incorrect CRBs and can cause CRB timeout. VAS FIFO offset is 0 when the receive window is opened during initialization. When the module is reloaded or in kexec boot, readOffset in FIFO control register may not match with VAS entry. This patch adds nx_coproc_init OPAL call to reset readOffset and queued entries in FIFO control register for both high and normal FIFOs. Signed-off-by: Haren Myneni [mpe: Fixup uninitialized variable warning] Signed-off-by: Michael Ellerman

powerpc/powernv: Add support to enable sensor groups

2018-07-31T09:56:45Z

Adds support to enable/disable a sensor group at runtime. This can be used to select the sensor groups that needs to be copied to main memory by OCC. Sensor groups like power, temperature, current, voltage, frequency, utilization can be enabled/disabled at runtime. Signed-off-by: Shilpasri G Bhat Signed-off-by: Michael Ellerman

powerpc/powernv: implement opal_put_chars_atomic

2018-07-24T12:09:57Z

The RAW console does not need writes to be atomic, so relax opal_put_chars to be able to do partial writes, and implement an _atomic variant which does not take a spinlock. This API is used in xmon, so the less locking that is used, the better chance there is that a crash can be debugged. Cc: Benjamin Herrenschmidt Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc/powernv: Implement and use opal_flush_console

2018-07-24T12:09:56Z

A new console flushing firmware API was introduced to replace event polling loops, and implemented in opal-kmsg with affddff69c55e ("powerpc/powernv: Add a kmsg_dumper that flushes console output on panic"), to flush the console in the panic path. The OPAL console driver has other situations where interrupts are off and it needs to flush the console synchronously. These still use a polling loop. So move the opal-kmsg flush code to opal_flush_console, and use the new function in opal-kmsg and opal_put_chars. Cc: Benjamin Herrenschmidt Reviewed-by: Russell Currey Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman