| Message ID | 20210510054213.1610760-9-andrew@aj.id.au (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ipmi: Allow raw access to KCS devices | expand |
On Mon, May 10, 2021 at 12:42:05AM CDT, Andrew Jeffery wrote: >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 <andrew@aj.id.au> >--- > drivers/char/ipmi/Kconfig | 13 +++++ > drivers/char/ipmi/Makefile | 3 +- > drivers/char/ipmi/kcs_bmc.c | 76 ++++++++++++++++++++++++--- > drivers/char/ipmi/kcs_bmc_cdev_ipmi.c | 31 ++++++++--- > drivers/char/ipmi/kcs_bmc_client.h | 14 +++++ > 5 files changed, 122 insertions(+), 15 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 70bfeb72c3c7..2ec8312ce766 100644 >--- a/drivers/char/ipmi/kcs_bmc.c >+++ b/drivers/char/ipmi/kcs_bmc.c >@@ -5,7 +5,9 @@ > */ > > #include <linux/device.h> >+#include <linux/list.h> > #include <linux/module.h> >+#include <linux/mutex.h> > > #include "kcs_bmc.h" > >@@ -13,6 +15,11 @@ > #include "kcs_bmc_device.h" > #include "kcs_bmc_client.h" > >+/* Record registered devices and drivers */ >+static DEFINE_MUTEX(kcs_bmc_lock); >+static LIST_HEAD(kcs_bmc_devices); >+static LIST_HEAD(kcs_bmc_drivers); >+ > /* Consumer data access */ > > u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc) >@@ -98,24 +105,77 @@ void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_clien > } > EXPORT_SYMBOL(kcs_bmc_disable_device); > >-int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc); > void kcs_bmc_add_device(struct kcs_bmc_device *kcs_bmc) > { >- if (kcs_bmc_ipmi_add_device(kcs_bmc)) >- pr_warn("Failed to add device for KCS channel %d\n", >- kcs_bmc->channel); >+ struct kcs_bmc_driver *drv; >+ 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(drv, &kcs_bmc_drivers, entry) { >+ rc = drv->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); > } > EXPORT_SYMBOL(kcs_bmc_add_device); > >-int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc); > void kcs_bmc_remove_device(struct kcs_bmc_device *kcs_bmc) > { >- if (kcs_bmc_ipmi_remove_device(kcs_bmc)) >- pr_warn("Failed to remove device for KCS channel %d\n", >- kcs_bmc->channel); >+ struct kcs_bmc_driver *drv; >+ int rc; >+ >+ mutex_lock(&kcs_bmc_lock); >+ list_del(&kcs_bmc->entry); >+ list_for_each_entry(drv, &kcs_bmc_drivers, entry) { >+ rc = drv->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); > } > EXPORT_SYMBOL(kcs_bmc_remove_device); > >+void kcs_bmc_register_driver(struct kcs_bmc_driver *drv) >+{ >+ struct kcs_bmc_device *kcs_bmc; >+ int rc; >+ >+ mutex_lock(&kcs_bmc_lock); >+ list_add(&drv->entry, &kcs_bmc_drivers); >+ list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) { >+ rc = drv->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); s/chardev/driver/? >+ } >+ mutex_unlock(&kcs_bmc_lock); >+} >+EXPORT_SYMBOL(kcs_bmc_register_driver); >+ >+void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv) >+{ >+ struct kcs_bmc_device *kcs_bmc; >+ int rc; >+ >+ mutex_lock(&kcs_bmc_lock); >+ list_del(&drv->entry); >+ list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) { >+ rc = drv->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); s/add chardev/remove driver/? >+ } >+ mutex_unlock(&kcs_bmc_lock); >+} >+EXPORT_SYMBOL(kcs_bmc_unregister_driver); >+ > MODULE_LICENSE("GPL v2"); > MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>"); > MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>"); >diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c >index 865d8b93f3b7..486834a962c3 100644 >--- a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c >+++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c >@@ -469,8 +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_add_device(struct kcs_bmc_device *kcs_bmc); >-int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc) >+static int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc) > { > struct kcs_bmc_ipmi *priv; > int rc; >@@ -512,10 +511,8 @@ int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc) > > return 0; > } >-EXPORT_SYMBOL(kcs_bmc_ipmi_add_device); > >-int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc); >-int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc) >+static int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc) > { > struct kcs_bmc_ipmi *priv = NULL, *pos; > >@@ -541,7 +538,29 @@ int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc) > > return 0; > } >-EXPORT_SYMBOL(kcs_bmc_ipmi_remove_device); >+ >+static const struct kcs_bmc_driver_ops kcs_bmc_ipmi_driver_ops = { >+ .add_device = kcs_bmc_ipmi_add_device, >+ .remove_device = kcs_bmc_ipmi_remove_device, >+}; >+ >+static struct kcs_bmc_driver kcs_bmc_ipmi_driver = { >+ .ops = &kcs_bmc_ipmi_driver_ops, >+}; >+ >+static int kcs_bmc_ipmi_init(void) >+{ >+ kcs_bmc_register_driver(&kcs_bmc_ipmi_driver); >+ >+ return 0; >+} >+module_init(kcs_bmc_ipmi_init); >+ >+static void kcs_bmc_ipmi_exit(void) >+{ >+ kcs_bmc_unregister_driver(&kcs_bmc_ipmi_driver); >+} >+module_exit(kcs_bmc_ipmi_exit); > > MODULE_LICENSE("GPL v2"); > MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>"); >diff --git a/drivers/char/ipmi/kcs_bmc_client.h b/drivers/char/ipmi/kcs_bmc_client.h >index c0f85c5bdf5c..cb38b56cda85 100644 >--- a/drivers/char/ipmi/kcs_bmc_client.h >+++ b/drivers/char/ipmi/kcs_bmc_client.h >@@ -11,6 +11,17 @@ > > #include "kcs_bmc.h" > >+struct kcs_bmc_driver_ops { >+ int (*add_device)(struct kcs_bmc_device *kcs_bmc); >+ int (*remove_device)(struct kcs_bmc_device *kcs_bmc); >+}; >+ >+struct kcs_bmc_driver { >+ struct list_head entry; >+ >+ const struct kcs_bmc_driver_ops *ops; >+}; >+ > struct kcs_bmc_client_ops { > irqreturn_t (*event)(struct kcs_bmc_client *client); > }; >@@ -21,6 +32,9 @@ struct kcs_bmc_client { > struct kcs_bmc_device *dev; > }; > >+void kcs_bmc_register_driver(struct kcs_bmc_driver *drv); >+void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv); >+ > 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 >
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 70bfeb72c3c7..2ec8312ce766 100644 --- a/drivers/char/ipmi/kcs_bmc.c +++ b/drivers/char/ipmi/kcs_bmc.c @@ -5,7 +5,9 @@ */ #include <linux/device.h> +#include <linux/list.h> #include <linux/module.h> +#include <linux/mutex.h> #include "kcs_bmc.h" @@ -13,6 +15,11 @@ #include "kcs_bmc_device.h" #include "kcs_bmc_client.h" +/* Record registered devices and drivers */ +static DEFINE_MUTEX(kcs_bmc_lock); +static LIST_HEAD(kcs_bmc_devices); +static LIST_HEAD(kcs_bmc_drivers); + /* Consumer data access */ u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc) @@ -98,24 +105,77 @@ void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_clien } EXPORT_SYMBOL(kcs_bmc_disable_device); -int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc); void kcs_bmc_add_device(struct kcs_bmc_device *kcs_bmc) { - if (kcs_bmc_ipmi_add_device(kcs_bmc)) - pr_warn("Failed to add device for KCS channel %d\n", - kcs_bmc->channel); + struct kcs_bmc_driver *drv; + 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(drv, &kcs_bmc_drivers, entry) { + rc = drv->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); } EXPORT_SYMBOL(kcs_bmc_add_device); -int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc); void kcs_bmc_remove_device(struct kcs_bmc_device *kcs_bmc) { - if (kcs_bmc_ipmi_remove_device(kcs_bmc)) - pr_warn("Failed to remove device for KCS channel %d\n", - kcs_bmc->channel); + struct kcs_bmc_driver *drv; + int rc; + + mutex_lock(&kcs_bmc_lock); + list_del(&kcs_bmc->entry); + list_for_each_entry(drv, &kcs_bmc_drivers, entry) { + rc = drv->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); } EXPORT_SYMBOL(kcs_bmc_remove_device); +void kcs_bmc_register_driver(struct kcs_bmc_driver *drv) +{ + struct kcs_bmc_device *kcs_bmc; + int rc; + + mutex_lock(&kcs_bmc_lock); + list_add(&drv->entry, &kcs_bmc_drivers); + list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) { + rc = drv->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); +} +EXPORT_SYMBOL(kcs_bmc_register_driver); + +void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv) +{ + struct kcs_bmc_device *kcs_bmc; + int rc; + + mutex_lock(&kcs_bmc_lock); + list_del(&drv->entry); + list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) { + rc = drv->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); +} +EXPORT_SYMBOL(kcs_bmc_unregister_driver); + MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>"); MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>"); diff --git a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c index 865d8b93f3b7..486834a962c3 100644 --- a/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c +++ b/drivers/char/ipmi/kcs_bmc_cdev_ipmi.c @@ -469,8 +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_add_device(struct kcs_bmc_device *kcs_bmc); -int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc) +static int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc) { struct kcs_bmc_ipmi *priv; int rc; @@ -512,10 +511,8 @@ int kcs_bmc_ipmi_add_device(struct kcs_bmc_device *kcs_bmc) return 0; } -EXPORT_SYMBOL(kcs_bmc_ipmi_add_device); -int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc); -int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc) +static int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc) { struct kcs_bmc_ipmi *priv = NULL, *pos; @@ -541,7 +538,29 @@ int kcs_bmc_ipmi_remove_device(struct kcs_bmc_device *kcs_bmc) return 0; } -EXPORT_SYMBOL(kcs_bmc_ipmi_remove_device); + +static const struct kcs_bmc_driver_ops kcs_bmc_ipmi_driver_ops = { + .add_device = kcs_bmc_ipmi_add_device, + .remove_device = kcs_bmc_ipmi_remove_device, +}; + +static struct kcs_bmc_driver kcs_bmc_ipmi_driver = { + .ops = &kcs_bmc_ipmi_driver_ops, +}; + +static int kcs_bmc_ipmi_init(void) +{ + kcs_bmc_register_driver(&kcs_bmc_ipmi_driver); + + return 0; +} +module_init(kcs_bmc_ipmi_init); + +static void kcs_bmc_ipmi_exit(void) +{ + kcs_bmc_unregister_driver(&kcs_bmc_ipmi_driver); +} +module_exit(kcs_bmc_ipmi_exit); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>"); diff --git a/drivers/char/ipmi/kcs_bmc_client.h b/drivers/char/ipmi/kcs_bmc_client.h index c0f85c5bdf5c..cb38b56cda85 100644 --- a/drivers/char/ipmi/kcs_bmc_client.h +++ b/drivers/char/ipmi/kcs_bmc_client.h @@ -11,6 +11,17 @@ #include "kcs_bmc.h" +struct kcs_bmc_driver_ops { + int (*add_device)(struct kcs_bmc_device *kcs_bmc); + int (*remove_device)(struct kcs_bmc_device *kcs_bmc); +}; + +struct kcs_bmc_driver { + struct list_head entry; + + const struct kcs_bmc_driver_ops *ops; +}; + struct kcs_bmc_client_ops { irqreturn_t (*event)(struct kcs_bmc_client *client); }; @@ -21,6 +32,9 @@ struct kcs_bmc_client { struct kcs_bmc_device *dev; }; +void kcs_bmc_register_driver(struct kcs_bmc_driver *drv); +void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv); + 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);
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 <andrew@aj.id.au> --- drivers/char/ipmi/Kconfig | 13 +++++ drivers/char/ipmi/Makefile | 3 +- drivers/char/ipmi/kcs_bmc.c | 76 ++++++++++++++++++++++++--- drivers/char/ipmi/kcs_bmc_cdev_ipmi.c | 31 ++++++++--- drivers/char/ipmi/kcs_bmc_client.h | 14 +++++ 5 files changed, 122 insertions(+), 15 deletions(-)