From 013bd8e543c2c777b586cf033c588ea82bd502db Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 10 Dec 2021 23:18:55 +0100 Subject: 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 Tested-by: Michael Kelley Tested-by: Nishanth Menon Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/20211210221813.676660809@linutronix.de --- kernel/irq/msi.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'kernel/irq') diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index b3f73ef0376c..6bca6ad9bf69 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) -- cgit v1.2.3