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device: Add device:: Msi_data pointer and struct msi_device_data

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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@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211210221813.676660809@linutronix.de
This commit is contained in:
Thomas Gleixner
2021-12-10 23:18:55 +01:00
parent 34fff62827
commit 013bd8e543
3 changed files with 55 additions and 0 deletions
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32
kernel/irq/msi.c
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@@ -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)