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| author | Nipun Gupta <nipun.gupta@amd.com> | 2024-02-26 13:58:16 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-03-07 21:52:03 +0000 |
| commit | 0e439ba38e615e505404b3935585f1898bafaea9 (patch) | |
| tree | 709940488debd9b540d1074977003c165a8356fa /drivers/cdx/cdx.h | |
| parent | e3a59056a655975868863a80fc8c05cb25e3b866 (diff) | |
| download | lwn-0e439ba38e615e505404b3935585f1898bafaea9.tar.gz lwn-0e439ba38e615e505404b3935585f1898bafaea9.zip | |
cdx: add MSI support for CDX bus
Add CDX-MSI domain per CDX controller with gic-its domain as
a parent, to support MSI for CDX devices. CDX devices allocate
MSIs from the CDX domain. Also, introduce APIs to alloc and free
IRQs for CDX domain.
In CDX subsystem firmware is a controller for all devices and
their configuration. CDX bus controller sends all the write_msi_msg
commands to firmware running on RPU and the firmware interfaces with
actual devices to pass this information to devices
Since, CDX controller is the only way to communicate with the Firmware
for MSI write info, CDX domain per controller required in contrast to
having a CDX domain per device.
Co-developed-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Signed-off-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Co-developed-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20240226082816.100872-1-nipun.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/cdx/cdx.h')
| -rw-r--r-- | drivers/cdx/cdx.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/cdx/cdx.h b/drivers/cdx/cdx.h index 300ad8be7a34..9c60c04dcf87 100644 --- a/drivers/cdx/cdx.h +++ b/drivers/cdx/cdx.h @@ -25,6 +25,8 @@ * @req_id: Requestor ID associated with CDX device * @class: Class of the CDX Device * @revision: Revision of the CDX device + * @msi_dev_id: MSI device ID associated with CDX device + * @num_msi: Number of MSI's supported by the device */ struct cdx_dev_params { struct cdx_controller *cdx; @@ -40,6 +42,8 @@ struct cdx_dev_params { u32 req_id; u32 class; u8 revision; + u32 msi_dev_id; + u32 num_msi; }; /** @@ -79,4 +83,12 @@ int cdx_device_add(struct cdx_dev_params *dev_params); */ struct device *cdx_bus_add(struct cdx_controller *cdx, u8 bus_num); +/** + * cdx_msi_domain_init - Init the CDX bus MSI domain. + * @dev: Device of the CDX bus controller + * + * Return: CDX MSI domain, NULL on failure + */ +struct irq_domain *cdx_msi_domain_init(struct device *dev); + #endif /* _CDX_H_ */ |