diff options
| author | Nipun Gupta <nipun.gupta@amd.com> | 2024-02-26 11:28:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-03-08 00:52:03 +0300 |
| commit | 0e439ba38e615e505404b3935585f1898bafaea9 (patch) | |
| tree | 709940488debd9b540d1074977003c165a8356fa /drivers/cdx/controller/mcdi_functions.h | |
| parent | e3a59056a655975868863a80fc8c05cb25e3b866 (diff) | |
| download | linux-0e439ba38e615e505404b3935585f1898bafaea9.tar.xz | |
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/controller/mcdi_functions.h')
| -rw-r--r-- | drivers/cdx/controller/mcdi_functions.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/cdx/controller/mcdi_functions.h b/drivers/cdx/controller/mcdi_functions.h index 258a5462fbe3..b9942affdc6b 100644 --- a/drivers/cdx/controller/mcdi_functions.h +++ b/drivers/cdx/controller/mcdi_functions.h @@ -66,6 +66,26 @@ int cdx_mcdi_bus_enable(struct cdx_mcdi *cdx, u8 bus_num); int cdx_mcdi_bus_disable(struct cdx_mcdi *cdx, u8 bus_num); /** + * cdx_mcdi_write_msi - Write MSI configuration for CDX device + * @cdx: pointer to MCDI interface. + * @bus_num: Bus number. + * @dev_num: Device number. + * @msi_vector: Device-relative MSI vector number. + * Must be < MSI_COUNT reported for the device. + * @msi_address: MSI address to be used by the hardware. Typically, on ARM + * systems this address is translated by the IOMMU (if enabled) and + * it is the responsibility of the entity managing the IOMMU (APU kernel) + * to supply the correct IOVA here. + * @msi_data: MSI data to be used by the hardware. On versal-net, only the + * lower 16-bits are used, the remaining bits are ignored and should be + * set to zero. + * + * Return: 0 on success, <0 on failure + */ +int cdx_mcdi_write_msi(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num, + u32 msi_vector, u64 msi_address, u32 msi_data); + +/** * cdx_mcdi_reset_device - Reset cdx device represented by bus_num:dev_num * @cdx: pointer to MCDI interface. * @bus_num: Bus number. @@ -89,4 +109,17 @@ int cdx_mcdi_reset_device(struct cdx_mcdi *cdx, int cdx_mcdi_bus_master_enable(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num, bool enable); +/** + * cdx_mcdi_msi_enable - Enable/Disable MSIs for cdx device represented + * by bus_num:dev_num + * @cdx: pointer to MCDI interface. + * @bus_num: Bus number. + * @dev_num: Device number. + * @enable: Enable msi's if set, disable otherwise. + * + * Return: 0 on success, <0 on failure + */ +int cdx_mcdi_msi_enable(struct cdx_mcdi *cdx, u8 bus_num, + u8 dev_num, bool enable); + #endif /* CDX_MCDI_FUNCTIONS_H */ |