Commit faae6e39 authored by Andrew Jeffery's avatar Andrew Jeffery Committed by Corey Minyard
Browse files

ipmi: kcs_bmc: Split headers into device and client 



Strengthen the distinction between code that abstracts the
implementation of the KCS behaviours (device drivers) and code that
exploits KCS behaviours (clients). Neither needs to know about the APIs
required by the other, so provide separate headers.

Signed-off-by: default avatarAndrew Jeffery <andrew@aj.id.au>
Message-Id: <20210608104757.582199-7-andrew@aj.id.au>
Reviewed-by: default avatarZev Weiss <zweiss@equinix.com>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
parent d7096970

drivers/char/ipmi/kcs_bmc.c

+15 −8
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2015-2018, Intel Corporation.

 * Copyright (c) 2021, IBM Corp.

 */



#include <linux/module.h>



#include "kcs_bmc.h"



/* Implement both the device and client interfaces here */

#include "kcs_bmc_device.h"

#include "kcs_bmc_client.h"



/* Consumer data access */



u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc)

{

	return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr);

	return kcs_bmc->ops->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr);

}

EXPORT_SYMBOL(kcs_bmc_read_data);



void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data)

{

	kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data);

	kcs_bmc->ops->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data);

}

EXPORT_SYMBOL(kcs_bmc_write_data);



u8 kcs_bmc_read_status(struct kcs_bmc *kcs_bmc)

{

	return kcs_bmc->io_inputb(kcs_bmc, kcs_bmc->ioreg.str);

	return kcs_bmc->ops->io_inputb(kcs_bmc, kcs_bmc->ioreg.str);

}

EXPORT_SYMBOL(kcs_bmc_read_status);



void kcs_bmc_write_status(struct kcs_bmc *kcs_bmc, u8 data)

{

	kcs_bmc->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data);

	kcs_bmc->ops->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data);

}

EXPORT_SYMBOL(kcs_bmc_write_status);



void kcs_bmc_update_status(struct kcs_bmc *kcs_bmc, u8 mask, u8 val)

{

	kcs_bmc->io_updateb(kcs_bmc, kcs_bmc->ioreg.str, mask, val);

	kcs_bmc->ops->io_updateb(kcs_bmc, kcs_bmc->ioreg.str, mask, val);

}

EXPORT_SYMBOL(kcs_bmc_update_status);



int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc);

int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)

irqreturn_t kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc)

{

	return kcs_bmc_ipmi_event(kcs_bmc);

	return kcs_bmc->client.ops->event(&kcs_bmc->client);

}

EXPORT_SYMBOL(kcs_bmc_handle_event);
@@ -62,4 +68,5 @@ EXPORT_SYMBOL(kcs_bmc_remove_device); 


MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");

MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");

MODULE_DESCRIPTION("KCS BMC to handle the IPMI request from system software");

drivers/char/ipmi/kcs_bmc.h

+12 −15
Original line number Diff line number Diff line
@@ -8,6 +8,12 @@ 


#include <linux/miscdevice.h>



#include "kcs_bmc_client.h"



#define KCS_BMC_STR_OBF		BIT(0)

#define KCS_BMC_STR_IBF		BIT(1)

#define KCS_BMC_STR_CMD_DAT	BIT(3)



/* Different phases of the KCS BMC module.

 *  KCS_PHASE_IDLE:

 *            BMC should not be expecting nor sending any data.
@@ -66,19 +72,21 @@ struct kcs_ioreg { 
	u32 str;

};



struct kcs_bmc_device_ops;



struct kcs_bmc {

	struct device *dev;



	const struct kcs_bmc_device_ops *ops;



	struct kcs_bmc_client client;



	spinlock_t lock;



	u32 channel;

	int running;



	/* Setup by BMC KCS controller driver */

	struct kcs_ioreg ioreg;

	u8 (*io_inputb)(struct kcs_bmc *kcs_bmc, u32 reg);

	void (*io_outputb)(struct kcs_bmc *kcs_bmc, u32 reg, u8 b);

	void (*io_updateb)(struct kcs_bmc *kcs_bmc, u32 reg, u8 mask, u8 val);



	enum kcs_phases phase;

	enum kcs_errors error;
@@ -97,15 +105,4 @@ struct kcs_bmc { 


	struct miscdevice miscdev;

};



int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc);

int kcs_bmc_add_device(struct kcs_bmc *kcs_bmc);

void kcs_bmc_remove_device(struct kcs_bmc *kcs_bmc);



u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc);

void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data);

u8 kcs_bmc_read_status(struct kcs_bmc *kcs_bmc);

void kcs_bmc_write_status(struct kcs_bmc *kcs_bmc, u8 data);

void kcs_bmc_update_status(struct kcs_bmc *kcs_bmc, u8 mask, u8 val);



#endif /* __KCS_BMC_H__ */

drivers/char/ipmi/kcs_bmc_aspeed.c

+9 −8
Original line number Diff line number Diff line
@@ -21,7 +21,7 @@ 
#include <linux/slab.h>

#include <linux/timer.h>



#include "kcs_bmc.h"

#include "kcs_bmc_device.h"





#define DEVICE_NAME     "ast-kcs-bmc"
@@ -220,14 +220,17 @@ static void aspeed_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable) 
	}

}



static const struct kcs_bmc_device_ops aspeed_kcs_ops = {

	.io_inputb = aspeed_kcs_inb,

	.io_outputb = aspeed_kcs_outb,

	.io_updateb = aspeed_kcs_updateb,

};



static irqreturn_t aspeed_kcs_irq(int irq, void *arg)

{

	struct kcs_bmc *kcs_bmc = arg;



	if (!kcs_bmc_handle_event(kcs_bmc))

		return IRQ_HANDLED;



	return IRQ_NONE;

	return kcs_bmc_handle_event(kcs_bmc);

}



static int aspeed_kcs_config_irq(struct kcs_bmc *kcs_bmc,
@@ -364,9 +367,7 @@ static int aspeed_kcs_probe(struct platform_device *pdev) 
	kcs_bmc->dev = &pdev->dev;

	kcs_bmc->channel = channel;

	kcs_bmc->ioreg = ast_kcs_bmc_ioregs[channel - 1];

	kcs_bmc->io_inputb = aspeed_kcs_inb;

	kcs_bmc->io_outputb = aspeed_kcs_outb;

	kcs_bmc->io_updateb = aspeed_kcs_updateb;

	kcs_bmc->ops = &aspeed_kcs_ops;



	priv->map = syscon_node_to_regmap(pdev->dev.parent->of_node);

	if (IS_ERR(priv->map)) {

drivers/char/ipmi/kcs_bmc_cdev_ipmi.c

+26 −13
Original line number Diff line number Diff line
@@ -22,7 +22,6 @@ 


#define KCS_ZERO_DATA     0





/* IPMI 2.0 - Table 9-1, KCS Interface Status Register Bits */

#define KCS_STATUS_STATE(state) (state << 6)

#define KCS_STATUS_STATE_MASK   GENMASK(7, 6)
@@ -179,12 +178,19 @@ static void kcs_bmc_ipmi_handle_cmd(struct kcs_bmc *kcs_bmc) 
	}

}



int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc);

int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc)

static inline struct kcs_bmc *client_to_kcs_bmc(struct kcs_bmc_client *client)

{

	return container_of(client, struct kcs_bmc, client);

}



static irqreturn_t kcs_bmc_ipmi_event(struct kcs_bmc_client *client)

{

	struct kcs_bmc *kcs_bmc;

	unsigned long flags;

	int ret = -ENODATA;

	u8 status;

	int ret;



	kcs_bmc = client_to_kcs_bmc(client);



	spin_lock_irqsave(&kcs_bmc->lock, flags);
@@ -197,23 +203,28 @@ int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc) 
		else

			kcs_bmc_ipmi_handle_data(kcs_bmc);



		ret = 0;

		ret = IRQ_HANDLED;

	} else {

		ret = IRQ_NONE;

	}



	spin_unlock_irqrestore(&kcs_bmc->lock, flags);



	return ret;

}

EXPORT_SYMBOL(kcs_bmc_ipmi_event);



static inline struct kcs_bmc *to_kcs_bmc(struct file *filp)

static const struct kcs_bmc_client_ops kcs_bmc_ipmi_client_ops = {

	.event = kcs_bmc_ipmi_event,

};



static inline struct kcs_bmc *file_to_kcs_bmc(struct file *filp)

{

	return container_of(filp->private_data, struct kcs_bmc, miscdev);

}



static int kcs_bmc_ipmi_open(struct inode *inode, struct file *filp)

{

	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);

	struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);

	int ret = 0;



	spin_lock_irq(&kcs_bmc->lock);
@@ -228,7 +239,7 @@ static int kcs_bmc_ipmi_open(struct inode *inode, struct file *filp) 


static __poll_t kcs_bmc_ipmi_poll(struct file *filp, poll_table *wait)

{

	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);

	struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);

	__poll_t mask = 0;



	poll_wait(filp, &kcs_bmc->queue, wait);
@@ -244,7 +255,7 @@ static __poll_t kcs_bmc_ipmi_poll(struct file *filp, poll_table *wait) 
static ssize_t kcs_bmc_ipmi_read(struct file *filp, char __user *buf,

			    size_t count, loff_t *ppos)

{

	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);

	struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);

	bool data_avail;

	size_t data_len;

	ssize_t ret;
@@ -306,7 +317,7 @@ static ssize_t kcs_bmc_ipmi_read(struct file *filp, char __user *buf, 
static ssize_t kcs_bmc_ipmi_write(struct file *filp, const char __user *buf,

			     size_t count, loff_t *ppos)

{

	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);

	struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);

	ssize_t ret;



	/* a minimum response size '3' : netfn + cmd + ccode */
@@ -342,7 +353,7 @@ static ssize_t kcs_bmc_ipmi_write(struct file *filp, const char __user *buf, 
static long kcs_bmc_ipmi_ioctl(struct file *filp, unsigned int cmd,

			  unsigned long arg)

{

	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);

	struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);

	long ret = 0;



	spin_lock_irq(&kcs_bmc->lock);
@@ -372,7 +383,7 @@ static long kcs_bmc_ipmi_ioctl(struct file *filp, unsigned int cmd, 


static int kcs_bmc_ipmi_release(struct inode *inode, struct file *filp)

{

	struct kcs_bmc *kcs_bmc = to_kcs_bmc(filp);

	struct kcs_bmc *kcs_bmc = file_to_kcs_bmc(filp);



	spin_lock_irq(&kcs_bmc->lock);

	kcs_bmc->running = 0;
@@ -401,6 +412,8 @@ int kcs_bmc_ipmi_add_device(struct kcs_bmc *kcs_bmc) 
	mutex_init(&kcs_bmc->mutex);

	init_waitqueue_head(&kcs_bmc->queue);



	kcs_bmc->client.dev = kcs_bmc;

	kcs_bmc->client.ops = &kcs_bmc_ipmi_client_ops;

	kcs_bmc->data_in = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);

	kcs_bmc->data_out = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);

	kcs_bmc->kbuffer = devm_kmalloc(kcs_bmc->dev, KCS_MSG_BUFSIZ, GFP_KERNEL);

drivers/char/ipmi/kcs_bmc_client.h

0 → 100644
+27 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright (c) 2021, IBM Corp. */



#ifndef __KCS_BMC_CONSUMER_H__

#define __KCS_BMC_CONSUMER_H__



#include <linux/irqreturn.h>



struct kcs_bmc;

struct kcs_bmc_client_ops;



struct kcs_bmc_client {

	const struct kcs_bmc_client_ops *ops;



	struct kcs_bmc *dev;

};



struct kcs_bmc_client_ops {

	irqreturn_t (*event)(struct kcs_bmc_client *client);

};



u8 kcs_bmc_read_data(struct kcs_bmc *kcs_bmc);

void kcs_bmc_write_data(struct kcs_bmc *kcs_bmc, u8 data);

u8 kcs_bmc_read_status(struct kcs_bmc *kcs_bmc);

void kcs_bmc_write_status(struct kcs_bmc *kcs_bmc, u8 data);

void kcs_bmc_update_status(struct kcs_bmc *kcs_bmc, u8 mask, u8 val);

#endif