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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>
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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*
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* Header file for the CDX Bus
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*
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* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
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*/
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#ifndef _CDX_H_
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#define _CDX_H_
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#include <linux/cdx/cdx_bus.h>
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/**
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* struct cdx_dev_params - CDX device parameters
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* @cdx: CDX controller associated with the device
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* @parent: Associated CDX Bus device
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* @vendor: Vendor ID for CDX device
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* @device: Device ID for CDX device
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* @subsys_vendor: Sub vendor ID for CDX device
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* @subsys_device: Sub device ID for CDX device
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* @bus_num: Bus number for this CDX device
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* @dev_num: Device number for this device
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* @res: array of MMIO region entries
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* @res_count: number of valid MMIO regions
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* @req_id: Requestor ID associated with CDX device
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* @class: Class of the CDX Device
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* @revision: Revision of the CDX device
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* @msi_dev_id: MSI device ID associated with CDX device
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* @num_msi: Number of MSI's supported by the device
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*/
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struct cdx_dev_params {
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struct cdx_controller *cdx;
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struct device *parent;
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u16 vendor;
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u16 device;
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u16 subsys_vendor;
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u16 subsys_device;
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u8 bus_num;
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u8 dev_num;
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struct resource res[MAX_CDX_DEV_RESOURCES];
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u8 res_count;
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u32 req_id;
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u32 class;
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u8 revision;
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u32 msi_dev_id;
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u32 num_msi;
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};
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/**
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* cdx_register_controller - Register a CDX controller and its ports
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* on the CDX bus.
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* @cdx: The CDX controller to register
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*
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* Return: -errno on failure, 0 on success.
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*/
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int cdx_register_controller(struct cdx_controller *cdx);
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/**
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* cdx_unregister_controller - Unregister a CDX controller
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* @cdx: The CDX controller to unregister
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*/
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void cdx_unregister_controller(struct cdx_controller *cdx);
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/**
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* cdx_device_add - Add a CDX device. This function adds a CDX device
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* on the CDX bus as per the device parameters provided
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* by caller. It also creates and registers an associated
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* Linux generic device.
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* @dev_params: device parameters associated with the device to be created.
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*
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* Return: -errno on failure, 0 on success.
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*/
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int cdx_device_add(struct cdx_dev_params *dev_params);
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/**
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* cdx_bus_add - Add a CDX bus. This function adds a bus on the CDX bus
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* subsystem. It creates a CDX device for the corresponding bus and
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* also registers an associated Linux generic device.
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* @cdx: Associated CDX controller
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* @us_num: Bus number
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*
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* Return: associated Linux generic device pointer on success or NULL on failure.
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*/
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struct device *cdx_bus_add(struct cdx_controller *cdx, u8 bus_num);
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/**
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* cdx_msi_domain_init - Init the CDX bus MSI domain.
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* @dev: Device of the CDX bus controller
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*
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* Return: CDX MSI domain, NULL on failure
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*/
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struct irq_domain *cdx_msi_domain_init(struct device *dev);
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#endif /* _CDX_H_ */
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