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Commit 0d7cd855 authored by Jeremy Kerr's avatar Jeremy Kerr Committed by Michael Ellerman
Browse files

powerpc/powernv: Add opal-prd channel 



This change adds a char device to access the "PRD" (processor runtime
diagnostics) channel to OPAL firmware.

Includes contributions from Vaidyanathan Srinivasan, Neelesh Gupta &
Vishal Kulkarni.

Signed-off-by: default avatarNeelesh Gupta <neelegup@linux.vnet.ibm.com>
Signed-off-by: default avatarJeremy Kerr <jk@ozlabs.org>
Acked-by: default avatarStewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 594fcb9e

arch/powerpc/include/asm/opal-api.h

+20 −1
Original line number Diff line number Diff line
@@ -153,7 +153,8 @@ 
#define OPAL_FLASH_READ				110

#define OPAL_FLASH_WRITE			111

#define OPAL_FLASH_ERASE			112

#define OPAL_LAST				112

#define OPAL_PRD_MSG				113

#define OPAL_LAST				113



/* Device tree flags */
@@ -359,6 +360,7 @@ enum opal_msg_type { 
	OPAL_MSG_SHUTDOWN,		/* params[0] = 1 reboot, 0 shutdown */

	OPAL_MSG_HMI_EVT,

	OPAL_MSG_DPO,

	OPAL_MSG_PRD,

	OPAL_MSG_TYPE_MAX,

};
@@ -681,6 +683,23 @@ typedef struct oppanel_line { 
	__be64 line_len;

} oppanel_line_t;



enum opal_prd_msg_type {

	OPAL_PRD_MSG_TYPE_INIT = 0,	/* HBRT --> OPAL */

	OPAL_PRD_MSG_TYPE_FINI,		/* HBRT/kernel --> OPAL */

	OPAL_PRD_MSG_TYPE_ATTN,		/* HBRT <-- OPAL */

	OPAL_PRD_MSG_TYPE_ATTN_ACK,	/* HBRT --> OPAL */

	OPAL_PRD_MSG_TYPE_OCC_ERROR,	/* HBRT <-- OPAL */

	OPAL_PRD_MSG_TYPE_OCC_RESET,	/* HBRT <-- OPAL */

};



struct opal_prd_msg_header {

	uint8_t		type;

	uint8_t		pad[1];

	__be16		size;

};



struct opal_prd_msg;



/*

 * SG entries

 *

arch/powerpc/include/asm/opal.h

+1 −0
Original line number Diff line number Diff line
@@ -194,6 +194,7 @@ int64_t opal_ipmi_recv(uint64_t interface, struct opal_ipmi_msg *msg, 
		uint64_t *msg_len);

int64_t opal_i2c_request(uint64_t async_token, uint32_t bus_id,

			 struct opal_i2c_request *oreq);

int64_t opal_prd_msg(struct opal_prd_msg *msg);



int64_t opal_flash_read(uint64_t id, uint64_t offset, uint64_t buf,

		uint64_t size, uint64_t token);

arch/powerpc/include/uapi/asm/opal-prd.h

0 → 100644
+58 −0
Original line number Diff line number Diff line 
/*

 * OPAL Runtime Diagnostics interface driver

 * Supported on POWERNV platform

 *

 * (C) Copyright IBM 2015

 *

 * Author: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>

 * Author: Jeremy Kerr <jk@ozlabs.org>

 *

 * 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, or (at your option)

 * any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#ifndef _UAPI_ASM_POWERPC_OPAL_PRD_H_

#define _UAPI_ASM_POWERPC_OPAL_PRD_H_



#include <linux/types.h>



/**

 * The version of the kernel interface of the PRD system. This describes the

 * interface available for the /dev/opal-prd device. The actual PRD message

 * layout and content is private to the firmware <--> userspace interface, so

 * is not covered by this versioning.

 *

 * Future interface versions are backwards-compatible; if a later kernel

 * version is encountered, functionality provided in earlier versions

 * will work.

 */

#define OPAL_PRD_KERNEL_VERSION		1



#define OPAL_PRD_GET_INFO		_IOR('o', 0x01, struct opal_prd_info)

#define OPAL_PRD_SCOM_READ		_IOR('o', 0x02, struct opal_prd_scom)

#define OPAL_PRD_SCOM_WRITE		_IOW('o', 0x03, struct opal_prd_scom)



#ifndef __ASSEMBLY__



struct opal_prd_info {

	__u64	version;

	__u64	reserved[3];

};



struct opal_prd_scom {

	__u64	chip;

	__u64	addr;

	__u64	data;

	__s64	rc;

};



#endif /* __ASSEMBLY__ */



#endif /* _UAPI_ASM_POWERPC_OPAL_PRD_H */

arch/powerpc/platforms/powernv/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -19,3 +19,10 @@ config PPC_POWERNV 
	select CPU_FREQ_GOV_CONSERVATIVE

	select PPC_DOORBELL

	default y



config OPAL_PRD

	tristate 'OPAL PRD driver'

	depends on PPC_POWERNV

	help

	  This enables the opal-prd driver, a facility to run processor

	  recovery diagnostics on OpenPower machines

arch/powerpc/platforms/powernv/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -9,3 +9,4 @@ obj-$(CONFIG_EEH) += eeh-powernv.o 
obj-$(CONFIG_PPC_SCOM)	+= opal-xscom.o

obj-$(CONFIG_MEMORY_FAILURE)	+= opal-memory-errors.o

obj-$(CONFIG_TRACEPOINTS)	+= opal-tracepoints.o

obj-$(CONFIG_OPAL_PRD)	+= opal-prd.o