kernel/arch/powerpc/include/asm/opal.h, branch linux-4.1.y

powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops

2018-05-23T01:36:33Z

[ Upstream commit 34dd25de9fe3f60bfdb31b473bf04b28262d0896 ] This is the start of an effort to tidy up and standardise all the delays. Existing loops have a range of delay/sleep periods from 1ms to 20ms, and some have no delay. They all loop forever except rtc, which times out after 10 retries, and that uses 10ms delays. So use 10ms as our standard delay. The OPAL maintainer agrees 10ms is a reasonable starting point. The idea is to use the same recipe everywhere, once this is proven to work then it will be documented as an OPAL API standard. Then both firmware and OS can agree, and if a particular call needs something else, then that can be documented with reasoning. This is not the end-all of this effort, it's just a relatively easy change that fixes some existing high latency delays. There should be provision for standardising timeouts and/or interruptible loops where possible, so non-fatal firmware errors don't cause hangs. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin

powerpc/powernv: Add interfaces for flash device access

2015-04-11T10:49:21Z

This change adds the OPAL interface definitions to allow Linux to read, write and erase from system flash devices. We register platform devices for the flash devices exported by firmware. We clash with the existing opal_flash_init function, which is really for the FSP flash update functionality, so we rename that initcall to opal_flash_update_init(). A future change will add an mtd driver that uses this interface. Changes from Joel Stanley and Jeremy Kerr. Signed-off-by: Cyril Bur Signed-off-by: Jeremy Kerr Signed-off-by: Joel Stanley Acked-by: Stewart Smith Signed-off-by: Michael Ellerman

powerpc/powernv: convert codes returned by OPAL calls

2015-03-31T03:50:33Z

OPAL has its own list of return codes. The patch provides a translation of such codes in errnos for the opal_sensor_read call, and possibly others if needed. Signed-off-by: Cédric Le Goater Signed-off-by: Michael Ellerman

Merge branch 'next-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc into test

2015-03-26T09:04:28Z

Merge miscellaneous bits from benh. Fix a minor conflict with OpalMessageType changing names to opal_msg_type.

powerpc/powernv: Add OPAL message notifier unregister function

2015-03-25T05:53:28Z

Provide an unregister interface for the opal message notifiers to be called when not needed like during driver unload/remove. Signed-off-by: Neelesh Gupta Reviewed-by: Vasant Hegde Signed-off-by: Benjamin Herrenschmidt

powerpc/powernv: Move opal-api.h closer to the Skiboot version

2015-03-16T07:50:16Z

This commit gets opal-api.h to mostly match the version in Skiboot as of commit ea7d806ab0ba. The exceptions are things which are not (currently) used in Linux. Most of this is just whitespace and a few things moving around. I think the diff is readable. Also OpalMessageType became opal_msg_type, requiring a change in the Linux code. Finally Skiboot and Linux disagree on CAPI vs CXL, because CAPI means something else in Linux. To handle that we just point the Linux wrapper, which is named "cxl" to the OPAL token OPAL_PCI_SET_PHB_CAPI_MODE. Signed-off-by: Michael Ellerman Reviewed-by: Stewart Smith

powerpc/powernv: Move OPAL API definitions to opal-api.h

2015-03-16T07:50:15Z

We'd like to get to the stage where the OPAL API is defined in a header that is identical between Linux and Skiboot. As step one, split the bits that actually define the API into opal-api.h. The Linux specific parts stay in opal.h. Signed-off-by: Michael Ellerman Acked-by: Stewart Smith

powerpc/powernv: Add OPAL soft-poweroff routine

2015-02-04T02:08:25Z

Register a notifier for a OPAL message indicating that the machine should prepare itself for a graceful power off. OPAL will tell us if the power off is a reboot or shutdown, but for now we perform the same orderly_poweroff action. Signed-off-by: Joel Stanley Signed-off-by: Michael Ellerman

cxl: Enable CAPP recovery

2015-01-22T06:31:52Z

Turning snoops on is the last step in CAPP recovery. Sapphire is expected to have reinitialized the PHB and done the previous recovery steps. Add mode argument to opal call to do this. Driver can turn snoops off although it does not currently. Signed-off-by: Ryan Grimm Acked-by: Ian Munsie Signed-off-by: Michael Ellerman

powernv/powerpc: Add winkle support for offline cpus

2014-12-14T23:46:41Z

Winkle is a deep idle state supported in power8 chips. A core enters winkle when all the threads of the core enter winkle. In this state power supply to the entire chiplet i.e core, private L2 and private L3 is turned off. As a result it gives higher powersavings compared to sleep. But entering winkle results in a total hypervisor state loss. Hence the hypervisor context has to be preserved before entering winkle and restored upon wake up. Power-on Reset Engine (PORE) is a dedicated engine which is responsible for powering on the chiplet during wake up. It can be programmed to restore the register contests of a few specific registers. This patch uses PORE to restore register state wherever possible and uses stack to save and restore rest of the necessary registers. With hypervisor state restore things fall under three categories- per-core state, per-subcore state and per-thread state. To manage this, extend the infrastructure introduced for sleep. Mainly we add a paca variable subcore_sibling_mask. Using this and the core_idle_state we can distingush first thread in core and subcore. Signed-off-by: Shreyas B. Prabhu Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman