The following commit has been merged into the irq/msi branch of tip: Commit-ID: 013bd8e543c2c777b586cf033c588ea82bd502db Gitweb: https://git.kernel.org/tip/013bd8e543c2c777b586cf033c588ea82bd502db Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx> AuthorDate: Fri, 10 Dec 2021 23:18:55 +01:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Thu, 16 Dec 2021 22:16:38 +01:00 device: Add device:: Msi_data pointer and struct msi_device_data Create struct msi_device_data and add a pointer of that type to struct dev_msi_info, which is part of struct device. Provide an allocator function which can be invoked from the MSI interrupt allocation code pathes. Add a properties field to the data structure as a first member so the allocation size is not zero bytes. The field will be uses later on. Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Tested-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> Tested-by: Nishanth Menon <nm@xxxxxx> Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Link: https://lore.kernel.org/r/20211210221813.676660809@xxxxxxxxxxxxx --- include/linux/device.h | 5 +++++ include/linux/msi.h | 18 ++++++++++++++++++ kernel/irq/msi.c | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 55 insertions(+) diff --git a/include/linux/device.h b/include/linux/device.h index f212b7a..f0033cd 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -45,6 +45,7 @@ struct iommu_ops; struct iommu_group; struct dev_pin_info; struct dev_iommu; +struct msi_device_data; /** * struct subsys_interface - interfaces to device functions @@ -374,11 +375,15 @@ struct dev_links_info { /** * struct dev_msi_info - Device data related to MSI * @domain: The MSI interrupt domain associated to the device + * @data: Pointer to MSI device data */ struct dev_msi_info { #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN struct irq_domain *domain; #endif +#ifdef CONFIG_GENERIC_MSI_IRQ + struct msi_device_data *data; +#endif }; /** diff --git a/include/linux/msi.h b/include/linux/msi.h index ba4a39c..7e4c8fd 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -171,6 +171,16 @@ struct msi_desc { }; }; +/** + * msi_device_data - MSI per device data + * @properties: MSI properties which are interesting to drivers + */ +struct msi_device_data { + unsigned long properties; +}; + +int msi_setup_device_data(struct device *dev); + /* Helpers to hide struct msi_desc implementation details */ #define msi_desc_to_dev(desc) ((desc)->dev) #define dev_to_msi_list(dev) (&(dev)->msi_list) @@ -233,10 +243,16 @@ void pci_msi_mask_irq(struct irq_data *data); void pci_msi_unmask_irq(struct irq_data *data); #ifdef CONFIG_SYSFS +int msi_device_populate_sysfs(struct device *dev); +void msi_device_destroy_sysfs(struct device *dev); + const struct attribute_group **msi_populate_sysfs(struct device *dev); void msi_destroy_sysfs(struct device *dev, const struct attribute_group **msi_irq_groups); #else +static inline int msi_device_populate_sysfs(struct device *dev) { return 0; } +static inline void msi_device_destroy_sysfs(struct device *dev) { } + static inline const struct attribute_group **msi_populate_sysfs(struct device *dev) { return NULL; @@ -384,6 +400,8 @@ enum { MSI_FLAG_MUST_REACTIVATE = (1 << 5), /* Is level-triggered capable, using two messages */ MSI_FLAG_LEVEL_CAPABLE = (1 << 6), + /* Populate sysfs on alloc() and destroy it on free() */ + MSI_FLAG_DEV_SYSFS = (1 << 7), }; int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask, diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index b3f73ef..6bca6ad 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -73,6 +73,38 @@ void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg) } EXPORT_SYMBOL_GPL(get_cached_msi_msg); +static void msi_device_data_release(struct device *dev, void *res) +{ + WARN_ON_ONCE(!list_empty(&dev->msi_list)); + dev->msi.data = NULL; +} + +/** + * msi_setup_device_data - Setup MSI device data + * @dev: Device for which MSI device data should be set up + * + * Return: 0 on success, appropriate error code otherwise + * + * This can be called more than once for @dev. If the MSI device data is + * already allocated the call succeeds. The allocated memory is + * automatically released when the device is destroyed. + */ +int msi_setup_device_data(struct device *dev) +{ + struct msi_device_data *md; + + if (dev->msi.data) + return 0; + + md = devres_alloc(msi_device_data_release, sizeof(*md), GFP_KERNEL); + if (!md) + return -ENOMEM; + + dev->msi.data = md; + devres_add(dev, md); + return 0; +} + #ifdef CONFIG_SYSFS static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
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