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Date: Sat, 27 Nov 2021 02:20:09 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: LKML <linux-kernel@...r.kernel.org> Cc: Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>, Alex Williamson <alex.williamson@...hat.com>, Kevin Tian <kevin.tian@...el.com>, Jason Gunthorpe <jgg@...dia.com>, Megha Dey <megha.dey@...el.com>, Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Santosh Shilimkar <ssantosh@...nel.org>, iommu@...ts.linux-foundation.org, dmaengine@...r.kernel.org, Stuart Yoder <stuyoder@...il.com>, Laurentiu Tudor <laurentiu.tudor@....com>, Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>, linux-arm-kernel@...ts.infradead.org, x86@...nel.org, Vinod Koul <vkoul@...nel.org>, Mark Rutland <mark.rutland@....com>, Will Deacon <will@...nel.org>, Sinan Kaya <okaya@...nel.org> Subject: [patch 02/37] 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. Signed-off-by: Thomas Gleixner <tglx@...utronix.de> --- include/linux/device.h | 5 +++++ include/linux/msi.h | 12 +++++++++++- kernel/irq/msi.c | 33 +++++++++++++++++++++++++++++++++ 3 files changed, 49 insertions(+), 1 deletion(-) --- 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 }; /** --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -2,6 +2,7 @@ #ifndef LINUX_MSI_H #define LINUX_MSI_H +#include <linux/spinlock.h> #include <linux/list.h> #include <asm/msi.h> @@ -170,6 +171,16 @@ struct msi_desc { }; }; +/** + * msi_device_data - MSI per device data + * @lock: Spinlock to protect register access + */ +struct msi_device_data { + raw_spinlock_t lock; +}; + +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) @@ -185,7 +196,6 @@ struct msi_desc { for (__irq = (desc)->irq; \ __irq < ((desc)->irq + (desc)->nvec_used); \ __irq++) - #ifdef CONFIG_IRQ_MSI_IOMMU static inline const void *msi_desc_get_iommu_cookie(struct msi_desc *desc) { --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -73,6 +73,39 @@ void get_cached_msi_msg(unsigned int irq } 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; + + raw_spin_lock_init(&md->lock); + 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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