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platform-msi: Add ABI to show msi_irqs of platform devices

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PCI devices expose the associated MSI interrupts via sysfs, but platform
devices which utilize MSI interrupts do not. This information is important
for user space tools to optimize affinity settings.

Utilize the generic MSI sysfs facility to expose this information for
platform MSI.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210813035628.6844-3-21cnbao@gmail.com
This commit is contained in:
Barry Song 2021-08-13 15:56:28 +12:00 committed by Thomas Gleixner
parent 2f170814bd
commit 00ed1401a0
2 changed files with 29 additions and 5 deletions
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14
Documentation/ABI/testing/sysfs-bus-platform
View File

@ -28,3 +28,17 @@ Description:
value comes from an ACPI _PXM method or a similar firmware
source. Initial users for this file would be devices like
arm smmu which are populated by arm64 acpi_iort.
What: /sys/bus/platform/devices/.../msi_irqs/
Date: August 2021
Contact: Barry Song <song.bao.hua@hisilicon.com>
Description:
The /sys/devices/.../msi_irqs directory contains a variable set
of files, with each file being named after a corresponding msi
irq vector allocated to that device.
What: /sys/bus/platform/devices/.../msi_irqs/<N>
Date: August 2021
Contact: Barry Song <song.bao.hua@hisilicon.com>
Description:
This attribute will show "msi" if <N> is a valid msi irq

20
drivers/base/platform-msi.c
View File

@ -21,11 +21,12 @@
* and the callback to write the MSI message.
*/
struct platform_msi_priv_data {
struct device *dev;
void *host_data;
msi_alloc_info_t arg;
irq_write_msi_msg_t write_msg;
int devid;
struct device *dev;
void *host_data;
const struct attribute_group **msi_irq_groups;
msi_alloc_info_t arg;
irq_write_msi_msg_t write_msg;
int devid;
};
/* The devid allocator */
@ -272,8 +273,16 @@ int platform_msi_domain_alloc_irqs(struct device *dev, unsigned int nvec,
if (err)
goto out_free_desc;
priv_data->msi_irq_groups = msi_populate_sysfs(dev);
if (IS_ERR(priv_data->msi_irq_groups)) {
err = PTR_ERR(priv_data->msi_irq_groups);
goto out_free_irqs;
}
return 0;
out_free_irqs:
msi_domain_free_irqs(dev->msi_domain, dev);
out_free_desc:
platform_msi_free_descs(dev, 0, nvec);
out_free_priv_data:
@ -293,6 +302,7 @@ void platform_msi_domain_free_irqs(struct device *dev)
struct msi_desc *desc;
desc = first_msi_entry(dev);
msi_destroy_sysfs(dev, desc->platform.msi_priv_data->msi_irq_groups);
platform_msi_free_priv_data(desc->platform.msi_priv_data);
}