Commit 4dea2d1a authored by Sukadev Bhattiprolu's avatar Sukadev Bhattiprolu Committed by Michael Ellerman
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powerpc/powernv/vas: Define vas_init() and vas_exit() 



Implement vas_init() and vas_exit() functions for a new VAS module.
This VAS module is essentially a library for other device drivers
and kernel users of the NX coprocessors like NX-842 and NX-GZIP.
In the future this will be extended to add support for user space
to access the NX coprocessors.

VAS is currently only supported with 64K page size.

Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent b6622a33

Documentation/devicetree/bindings/powerpc/ibm,vas.txt

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* IBM Powerpc Virtual Accelerator Switchboard (VAS)



VAS is a hardware mechanism that allows kernel subsystems and user processes

to directly submit compression and other requests to Nest accelerators (NX)

or other coprocessors functions.



Required properties:

- compatible : should be "ibm,vas".

- ibm,vas-id : A unique identifier for each instance of VAS in the system

- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor

  window context start and length, OS/User window context start and length,

  "Paste address" start and length, "Paste window id" start bit and number

  of bits)



Example:



	vas@6019100000000 {

		compatible = "ibm,vas", "ibm,power9-vas";

		reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>;

		name = "vas";

		ibm,vas-id = <0x1>;

	};

MAINTAINERS

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@@ -6429,6 +6429,14 @@ L: netdev@vger.kernel.org 
S:	Supported

F:	drivers/net/ethernet/ibm/ibmvnic.*



IBM Power Virtual Accelerator Switchboard

M:	Sukadev Bhattiprolu

L:	linuxppc-dev@lists.ozlabs.org

S:	Supported

F:	arch/powerpc/platforms/powernv/vas*

F:	arch/powerpc/include/asm/vas.h

F:	arch/powerpc/include/uapi/asm/vas.h



IBM Power Virtual Ethernet Device Driver

M:	Thomas Falcon <tlfalcon@linux.vnet.ibm.com>

L:	netdev@vger.kernel.org

arch/powerpc/platforms/powernv/Kconfig

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@@ -38,3 +38,17 @@ config PPC_MEMTRACE 
	help

	  Enabling this option allows for the removal of memory (RAM)

	  from the kernel mappings to be used for hardware tracing.



config PPC_VAS

	bool "IBM Virtual Accelerator Switchboard (VAS)"

	depends on PPC_POWERNV && PPC_64K_PAGES

	default y

	help

	  This enables support for IBM Virtual Accelerator Switchboard (VAS).



	  VAS allows accelerators in co-processors like NX-GZIP and NX-842

	  to be accessible to kernel subsystems and user processes.



	  VAS adapters are found in POWER9 based systems.



	  If unsure, say N.

arch/powerpc/platforms/powernv/Makefile

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@@ -14,3 +14,4 @@ obj-$(CONFIG_TRACEPOINTS) += opal-tracepoints.o 
obj-$(CONFIG_OPAL_PRD)	+= opal-prd.o

obj-$(CONFIG_PERF_EVENTS) += opal-imc.o

obj-$(CONFIG_PPC_MEMTRACE)	+= memtrace.o

obj-$(CONFIG_PPC_VAS)	+= vas.o vas-window.o

arch/powerpc/platforms/powernv/vas-window.c

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/*

 * Copyright 2016-17 IBM Corp.

 *

 * 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.

 */



#include <linux/types.h>

#include <linux/mutex.h>



#include "vas.h"



/* stub for now */

int vas_win_close(struct vas_window *window)

{

	return -1;

}

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