[11/19] ipmi: kcs_bmc: Split headers into device and client

Message ID	20210219142523.3464540-12-andrew@aj.id.au
State	New
Headers	show Return-Path: <linux-gpio-owner@kernel.org> From: Andrew Jeffery <andrew@aj.id.au> To: openipmi-developer@lists.sourceforge.net, openbmc@lists.ozlabs.org, minyard@acm.org Cc: robh+dt@kernel.org, joel@jms.id.au, lee.jones@linaro.org, avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, linus.walleij@linaro.org, chiawei_wang@aspeedtech.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-gpio@vger.kernel.org Subject: [PATCH 11/19] ipmi: kcs_bmc: Split headers into device and client Date: Sat, 20 Feb 2021 00:55:15 +1030 Message-Id: <20210219142523.3464540-12-andrew@aj.id.au> In-Reply-To: <20210219142523.3464540-1-andrew@aj.id.au> References: <20210219142523.3464540-1-andrew@aj.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	ipmi: Allow raw access to KCS devices \| expand [00/19] ipmi: Allow raw access to KCS devices [01/19] dt-bindings: aspeed-lpc: Remove LPC partitioning [02/19] ARM: dts: Remove LPC BMC and Host partitions [03/19] ipmi: kcs: aspeed: Adapt to new LPC DTS layout [04/19] pinctrl: aspeed-g5: Adapt to new LPC device tree layout [05/19] soc: aspeed: Adapt to new LPC device tree layout [06/19] ipmi: kcs_bmc_aspeed: Use of match data to extract KCS properties [07/19] ipmi: kcs_bmc: Make status update atomic [08/19] ipmi: kcs_bmc: Rename {read,write}_{status,data}() functions [09/19] ipmi: kcs_bmc: Split out kcs_bmc_cdev_ipmi [10/19] ipmi: kcs_bmc: Turn the driver data-structures inside-out [11/19] ipmi: kcs_bmc: Split headers into device and client [12/19] ipmi: kcs_bmc: Strip private client data from struct kcs_bmc [13/19] ipmi: kcs_bmc: Decouple the IPMI chardev from the core [14/19] ipmi: kcs_bmc: Allow clients to control KCS IRQ state [15/19] ipmi: kcs_bmc: Add a "raw" character device interface [16/19] dt-bindings: ipmi: Convert ASPEED KCS binding to schema [17/19] dt-bindings: ipmi: Add optional SerIRQ property to ASPEED KCS devices [18/19] ipmi: kcs_bmc_aspeed: Implement KCS SerIRQ configuration [19/19] ipmi: kcs_bmc_aspeed: Fix IBFIE typo from datasheet

diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c index 709b6bdec165..1046ce2bbefc 100644 --- a/drivers/char/ipmi/kcs_bmc.c +++ b/drivers/char/ipmi/kcs_bmc.c @@ -1,46 +1,52 @@ // 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) { - return kcs_bmc_ipmi_event(kcs_bmc); + return kcs_bmc->client.ops->event(&kcs_bmc->client); } EXPORT_SYMBOL(kcs_bmc_handle_event); @@ -60,4 +66,5 @@ 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"); diff --git a/drivers/char/ipmi/kcs_bmc.h b/drivers/char/ipmi/kcs_bmc.h index bf0ae327997f..a1350e567723 100644 --- a/drivers/char/ipmi/kcs_bmc.h +++ b/drivers/char/ipmi/kcs_bmc.h @@ -8,6 +8,15 @@ #include <linux/miscdevice.h> +#include "kcs_bmc_client.h" + +#define KCS_BMC_EVENT_NONE 0 +#define KCS_BMC_EVENT_HANDLED 1 + +#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 +75,21 @@ 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 +108,4 @@ 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); -int 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__ */ diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c index 0416ac78ce68..1b313355b1c8 100644 --- a/drivers/char/ipmi/kcs_bmc_aspeed.c +++ b/drivers/char/ipmi/kcs_bmc_aspeed.c @@ -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 +220,22 @@ 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; + int rc; - if (!kcs_bmc_handle_event(kcs_bmc)) - return IRQ_HANDLED; + rc = kcs_bmc_handle_event(kcs_bmc); + if (rc < 0) + dev_warn(kcs_bmc->dev, "Failed to service irq: %d\n", rc); - return IRQ_NONE; + return rc == KCS_BMC_EVENT_HANDLED ? IRQ_HANDLED : IRQ_NONE; } static int aspeed_kcs_config_irq(struct kcs_bmc *kcs_bmc, @@ -362,9 +370,7 @@ 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)) { diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c index c8922f94bafd..5472733b0005 100644 --- a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c +++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c @@ -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) @@ -179,11 +178,19 @@ static void kcs_bmc_ipmi_handle_cmd(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 int 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); @@ -196,23 +203,28 @@ int kcs_bmc_ipmi_event(struct kcs_bmc *kcs_bmc) else kcs_bmc_ipmi_handle_data(kcs_bmc); - ret = 0; + ret = KCS_BMC_EVENT_HANDLED; + } else { + ret = KCS_BMC_EVENT_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); @@ -227,7 +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); @@ -243,7 +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; @@ -305,7 +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 */ @@ -341,7 +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); @@ -371,7 +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; @@ -399,6 +411,8 @@ int kcs_bmc_ipmi_attach_cdev(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); diff --git a/drivers/char/ipmi/kcs_bmc_client.h b/drivers/char/ipmi/kcs_bmc_client.h new file mode 100644 index 000000000000..140631d157d8 --- /dev/null +++ b/drivers/char/ipmi/kcs_bmc_client.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2021, IBM Corp. */ + +#ifndef __KCS_BMC_CONSUMER_H__ +#define __KCS_BMC_CONSUMER_H__ + +#include <linux/list.h> +#include <linux/notifier.h> +#include <stdbool.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 { + int (*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 diff --git a/drivers/char/ipmi/kcs_bmc_device.h b/drivers/char/ipmi/kcs_bmc_device.h new file mode 100644 index 000000000000..33462174516d --- /dev/null +++ b/drivers/char/ipmi/kcs_bmc_device.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2021, IBM Corp. */ + +#ifndef __KCS_BMC_DEVICE_H__ +#define __KCS_BMC_DEVICE_H__ + +#include "kcs_bmc.h" + +struct kcs_bmc_device_ops { + 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 b); +}; + +int kcs_bmc_handle_event(struct kcs_bmc *kcs_bmc); +int kcs_bmc_add_device(struct kcs_bmc *kcs_bmc); +int kcs_bmc_remove_device(struct kcs_bmc *kcs_bmc); + +#endif diff --git a/drivers/char/ipmi/kcs_bmc_npcm7xx.c b/drivers/char/ipmi/kcs_bmc_npcm7xx.c index 5d017498dc69..1d21697fc585 100644 --- a/drivers/char/ipmi/kcs_bmc_npcm7xx.c +++ b/drivers/char/ipmi/kcs_bmc_npcm7xx.c @@ -17,7 +17,7 @@ #include <linux/regmap.h> #include <linux/slab.h> -#include "kcs_bmc.h" +#include "kcs_bmc_device.h" #define DEVICE_NAME "npcm-kcs-bmc" #define KCS_CHANNEL_MAX 3 @@ -127,11 +127,13 @@ static void npcm7xx_kcs_enable_channel(struct kcs_bmc *kcs_bmc, bool enable) static irqreturn_t npcm7xx_kcs_irq(int irq, void *arg) { struct kcs_bmc *kcs_bmc = arg; + int rc; - if (!kcs_bmc_handle_event(kcs_bmc)) - return IRQ_HANDLED; + rc = kcs_bmc_handle_event(kcs_bmc); + if (rc < 0) + dev_warn(kcs_bmc->dev, "Failed to service irq: %d\n", rc); - return IRQ_NONE; + return rc == KCS_BMC_EVENT_HANDLED ? IRQ_HANDLED : IRQ_NONE; } static int npcm7xx_kcs_config_irq(struct kcs_bmc *kcs_bmc, @@ -148,6 +150,12 @@ static int npcm7xx_kcs_config_irq(struct kcs_bmc *kcs_bmc, dev_name(dev), kcs_bmc); } +static const struct kcs_bmc_device_ops npcm7xx_kcs_ops = { + .io_inputb = npcm7xx_kcs_inb, + .io_outputb = npcm7xx_kcs_outb, + .io_updateb = npcm7xx_kcs_updateb, +}; + static int npcm7xx_kcs_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -179,9 +187,7 @@ static int npcm7xx_kcs_probe(struct platform_device *pdev) kcs_bmc->ioreg.idr = priv->reg->dib; kcs_bmc->ioreg.odr = priv->reg->dob; kcs_bmc->ioreg.str = priv->reg->sts; - kcs_bmc->io_inputb = npcm7xx_kcs_inb; - kcs_bmc->io_outputb = npcm7xx_kcs_outb; - kcs_bmc->io_updateb = npcm7xx_kcs_updateb; + kcs_bmc->ops = &npcm7xx_kcs_ops; platform_set_drvdata(pdev, priv);

[11/19] ipmi: kcs_bmc: Split headers into device and client

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Patch