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Received: from localhost.localdomain (ppp14-2-91-37.adl-apt-pir-bras31.tpg.internode.on.net [14.2.91.37]) by mail.messagingengine.com (Postfix) with ESMTPA id 3C27F24005D; Fri, 19 Feb 2021 09:27:06 -0500 (EST) From: Andrew Jeffery To: openipmi-developer@lists.sourceforge.net, openbmc@lists.ozlabs.org, minyard@acm.org Subject: [PATCH 13/19] ipmi: kcs_bmc: Decouple the IPMI chardev from the core Date: Sat, 20 Feb 2021 00:55:17 +1030 Message-Id: <20210219142523.3464540-14-andrew@aj.id.au> X-Mailer: git-send-email 2.27.0 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 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, tmaimon77@gmail.com, linux-aspeed@lists.ozlabs.org, linux-gpio@vger.kernel.org, avifishman70@gmail.com, venture@google.com, linus.walleij@linaro.org, linux-kernel@vger.kernel.org, tali.perry1@gmail.com, robh+dt@kernel.org, lee.jones@linaro.org, chiawei_wang@aspeedtech.com, linux-arm-kernel@lists.infradead.org, benjaminfair@google.com Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Sender: "openbmc" Now that we have untangled the data-structures, split the userspace interface out into its own module. Userspace interfaces and drivers are registered to the KCS BMC core to support arbitrary binding of either. Signed-off-by: Andrew Jeffery --- drivers/char/ipmi/Kconfig | 13 +++++ drivers/char/ipmi/Makefile | 3 +- drivers/char/ipmi/kcs_bmc.c | 78 ++++++++++++++++++++++++++- drivers/char/ipmi/kcs_bmc.h | 4 -- drivers/char/ipmi/kcs_bmc_cdev_ipmi.c | 31 +++++++++-- drivers/char/ipmi/kcs_bmc_client.h | 14 +++++ 6 files changed, 132 insertions(+), 11 deletions(-) diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig index 07847d9a459a..bc5f81899b62 100644 --- a/drivers/char/ipmi/Kconfig +++ b/drivers/char/ipmi/Kconfig @@ -124,6 +124,19 @@ config NPCM7XX_KCS_IPMI_BMC This support is also available as a module. If so, the module will be called kcs_bmc_npcm7xx. +config IPMI_KCS_BMC_CDEV_IPMI + depends on IPMI_KCS_BMC + tristate "IPMI character device interface for BMC KCS devices" + help + Provides a BMC-side character device implementing IPMI + semantics for KCS IPMI devices. + + Say YES if you wish to expose KCS devices on the BMC for IPMI + purposes. + + This support is also available as a module. The module will be + called kcs_bmc_cdev_ipmi. + config ASPEED_BT_IPMI_BMC depends on ARCH_ASPEED || COMPILE_TEST depends on REGMAP && REGMAP_MMIO && MFD_SYSCON diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile index a302bc865370..fcfa676afddb 100644 --- a/drivers/char/ipmi/Makefile +++ b/drivers/char/ipmi/Makefile @@ -22,7 +22,8 @@ obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o -obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o kcs_bmc_cdev_ipmi.o +obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o +obj-$(CONFIG_IPMI_KCS_BMC_CDEV_IPMI) += kcs_bmc_cdev_ipmi.o obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c index 266ebec71d6f..694db6ee2a92 100644 --- a/drivers/char/ipmi/kcs_bmc.c +++ b/drivers/char/ipmi/kcs_bmc.c @@ -5,7 +5,9 @@ */ #include +#include #include +#include #include "kcs_bmc.h" @@ -13,6 +15,11 @@ #include "kcs_bmc_device.h" #include "kcs_bmc_client.h" +/* Record probed devices and cdevs */ +static DEFINE_MUTEX(kcs_bmc_lock); +static LIST_HEAD(kcs_bmc_devices); +static LIST_HEAD(kcs_bmc_cdevs); + /* Consumer data access */ u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc) @@ -100,16 +107,83 @@ EXPORT_SYMBOL(kcs_bmc_disable_device); int kcs_bmc_add_device(struct kcs_bmc_device *kcs_bmc) { - return kcs_bmc_ipmi_attach_cdev(kcs_bmc); + struct kcs_bmc_cdev *cdev; + int rc; + + spin_lock_init(&kcs_bmc->lock); + kcs_bmc->client = NULL; + + mutex_lock(&kcs_bmc_lock); + list_add(&kcs_bmc->entry, &kcs_bmc_devices); + list_for_each_entry(cdev, &kcs_bmc_cdevs, entry) { + rc = cdev->ops->add_device(kcs_bmc); + if (rc) + dev_err(kcs_bmc->dev, "Failed to add chardev for KCS channel %d: %d", + kcs_bmc->channel, rc); + } + mutex_unlock(&kcs_bmc_lock); + + return 0; } EXPORT_SYMBOL(kcs_bmc_add_device); int kcs_bmc_remove_device(struct kcs_bmc_device *kcs_bmc) { - return kcs_bmc_ipmi_detach_cdev(kcs_bmc); + struct kcs_bmc_cdev *cdev; + int rc; + + mutex_lock(&kcs_bmc_lock); + list_del(&kcs_bmc->entry); + list_for_each_entry(cdev, &kcs_bmc_cdevs, entry) { + rc = cdev->ops->remove_device(kcs_bmc); + if (rc) + dev_err(kcs_bmc->dev, "Failed to remove chardev for KCS channel %d: %d", + kcs_bmc->channel, rc); + } + mutex_unlock(&kcs_bmc_lock); + + return 0; } EXPORT_SYMBOL(kcs_bmc_remove_device); +int kcs_bmc_register_cdev(struct kcs_bmc_cdev *cdev) +{ + struct kcs_bmc_device *kcs_bmc; + int rc; + + mutex_lock(&kcs_bmc_lock); + list_add(&cdev->entry, &kcs_bmc_cdevs); + list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) { + rc = cdev->ops->add_device(kcs_bmc); + if (rc) + dev_err(kcs_bmc->dev, "Failed to add chardev for KCS channel %d: %d", + kcs_bmc->channel, rc); + } + mutex_unlock(&kcs_bmc_lock); + + return 0; +} +EXPORT_SYMBOL(kcs_bmc_register_cdev); + +int kcs_bmc_unregister_cdev(struct kcs_bmc_cdev *cdev) +{ + struct kcs_bmc_device *kcs_bmc; + int rc; + + mutex_lock(&kcs_bmc_lock); + list_del(&cdev->entry); + list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) { + rc = cdev->ops->remove_device(kcs_bmc); + if (rc) + dev_err(kcs_bmc->dev, "Failed to add chardev for KCS channel %d: %d", + kcs_bmc->channel, rc); + } + mutex_unlock(&kcs_bmc_lock); + + return rc; +} +EXPORT_SYMBOL(kcs_bmc_unregister_cdev); + MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Haiyue Wang "); MODULE_AUTHOR("Andrew Jeffery "); diff --git a/drivers/char/ipmi/kcs_bmc.h b/drivers/char/ipmi/kcs_bmc.h index 3f266740c759..5deb9a0b8e60 100644 --- a/drivers/char/ipmi/kcs_bmc.h +++ b/drivers/char/ipmi/kcs_bmc.h @@ -42,8 +42,4 @@ struct kcs_bmc_device { spinlock_t lock; struct kcs_bmc_client *client; }; - -/* Temporary exports while refactoring */ -int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc_device *kcs_bmc); -int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc_device *kcs_bmc); #endif /* __KCS_BMC_H__ */ diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c index 537d936eb3e5..81673f2afb44 100644 --- a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c +++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c @@ -469,7 +469,7 @@ static const struct file_operations kcs_bmc_ipmi_fops = { static DEFINE_SPINLOCK(kcs_bmc_ipmi_instances_lock); static LIST_HEAD(kcs_bmc_ipmi_instances); -int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc_device *kcs_bmc) +static int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc_device *kcs_bmc) { struct kcs_bmc_ipmi *priv; int rc; @@ -511,9 +511,8 @@ int kcs_bmc_ipmi_attach_cdev(struct kcs_bmc_device *kcs_bmc) return 0; } -EXPORT_SYMBOL(kcs_bmc_ipmi_attach_cdev); -int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc_device *kcs_bmc) +static int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc_device *kcs_bmc) { struct kcs_bmc_ipmi *priv, *pos; @@ -539,7 +538,31 @@ int kcs_bmc_ipmi_detach_cdev(struct kcs_bmc_device *kcs_bmc) return 0; } -EXPORT_SYMBOL(kcs_bmc_ipmi_detach_cdev); + +static const struct kcs_bmc_cdev_ops kcs_bmc_ipmi_cdev_ops = { + .add_device = kcs_bmc_ipmi_attach_cdev, + .remove_device = kcs_bmc_ipmi_detach_cdev, +}; + +static struct kcs_bmc_cdev kcs_bmc_ipmi_cdev = { + .ops = &kcs_bmc_ipmi_cdev_ops, +}; + +static int kcs_bmc_ipmi_init(void) +{ + return kcs_bmc_register_cdev(&kcs_bmc_ipmi_cdev); +} +module_init(kcs_bmc_ipmi_init); + +static void kcs_bmc_ipmi_exit(void) +{ + int rc; + + rc = kcs_bmc_unregister_cdev(&kcs_bmc_ipmi_cdev); + if (rc) + pr_warn("Failed to remove KCS BMC client: %d", rc); +} +module_exit(kcs_bmc_ipmi_exit); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Haiyue Wang "); diff --git a/drivers/char/ipmi/kcs_bmc_client.h b/drivers/char/ipmi/kcs_bmc_client.h index 2dd710f4b4aa..d0a7404ff584 100644 --- a/drivers/char/ipmi/kcs_bmc_client.h +++ b/drivers/char/ipmi/kcs_bmc_client.h @@ -10,6 +10,17 @@ #include "kcs_bmc.h" +struct kcs_bmc_cdev_ops { + int (*add_device)(struct kcs_bmc_device *kcs_bmc); + int (*remove_device)(struct kcs_bmc_device *kcs_bmc); +}; + +struct kcs_bmc_cdev { + struct list_head entry; + + const struct kcs_bmc_cdev_ops *ops; +}; + struct kcs_bmc_client_ops { int (*event)(struct kcs_bmc_client *client); }; @@ -20,6 +31,9 @@ struct kcs_bmc_client { struct kcs_bmc_device *dev; }; +int kcs_bmc_register_cdev(struct kcs_bmc_cdev *cdev); +int kcs_bmc_unregister_cdev(struct kcs_bmc_cdev *cdev); + int kcs_bmc_enable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client); void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client); -- 2.27.0