Commit 8b0d0312 authored by Shubhrajyoti Datta's avatar Shubhrajyoti Datta Committed by Borislav Petkov (AMD)
Browse files

cdx: Export Symbols for MCDI RPC and Initialization 



The cdx_mcdi_init(), cdx_mcdi_process_cmd(), and cdx_mcdi_rpc() functions are
needed by the VersalNET EDAC module that interact with the MCDI (Management
Controller Direct Interface) framework. These functions facilitate
communication between different hardware components by enabling command
execution and status management.

Signed-off-by: default avatarShubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Acked-by: default avatarNikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/20250908115649.22903-1-shubhrajyoti.datta@amd.com
parent 54fd6bd4

drivers/cdx/controller/mcdi.c

+38 −0
Original line number Diff line number Diff line
@@ -100,6 +100,19 @@ static unsigned long cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd 
		return cdx->mcdi_ops->mcdi_rpc_timeout(cdx, cmd);

}



/**

 * cdx_mcdi_init - Initialize MCDI (Management Controller Driver Interface) state

 * @cdx:	Handle to the CDX MCDI structure

 *

 * This function allocates and initializes internal MCDI structures and resources

 * for the CDX device, including the workqueue, locking primitives, and command

 * tracking mechanisms. It sets the initial operating mode and prepares the device

 * for MCDI operations.

 *

 * Return:

 * * 0        - on success

 * * -ENOMEM  - if memory allocation or workqueue creation fails

 */

int cdx_mcdi_init(struct cdx_mcdi *cdx)

{

	struct cdx_mcdi_iface *mcdi;
@@ -129,7 +142,16 @@ int cdx_mcdi_init(struct cdx_mcdi *cdx) 
fail:

	return rc;

}

EXPORT_SYMBOL_GPL(cdx_mcdi_init);



/**

 * cdx_mcdi_finish - Cleanup MCDI (Management Controller Driver Interface) state

 * @cdx:	Handle to the CDX MCDI structure

 *

 * This function is responsible for cleaning up the MCDI (Management Controller Driver Interface)

 * resources associated with a cdx_mcdi structure. Also destroys the mcdi workqueue.

 *

 */

void cdx_mcdi_finish(struct cdx_mcdi *cdx)

{

	struct cdx_mcdi_iface *mcdi;
@@ -144,6 +166,7 @@ void cdx_mcdi_finish(struct cdx_mcdi *cdx) 
	kfree(cdx->mcdi);

	cdx->mcdi = NULL;

}

EXPORT_SYMBOL_GPL(cdx_mcdi_finish);



static bool cdx_mcdi_flushed(struct cdx_mcdi_iface *mcdi, bool ignore_cleanups)

{
@@ -554,6 +577,19 @@ static void cdx_mcdi_start_or_queue(struct cdx_mcdi_iface *mcdi, 
			cdx_mcdi_cmd_start_or_queue(mcdi, cmd);

}



/**

 * cdx_mcdi_process_cmd - Process an incoming MCDI response

 * @cdx:	Handle to the CDX MCDI structure

 * @outbuf:	Pointer to the response buffer received from the management controller

 * @len:	Length of the response buffer in bytes

 *

 * This function handles a response from the management controller. It locates the

 * corresponding command using the sequence number embedded in the header,

 * completes the command if it is still pending, and initiates any necessary cleanup.

 *

 * The function assumes that the response buffer is well-formed and at least one

 * dword in size.

 */

void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int len)

{

	struct cdx_mcdi_iface *mcdi;
@@ -591,6 +627,7 @@ void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int le 


	cdx_mcdi_process_cleanup_list(mcdi->cdx, &cleanup_list);

}

EXPORT_SYMBOL_GPL(cdx_mcdi_process_cmd);



static void cdx_mcdi_cmd_work(struct work_struct *context)

{
@@ -758,6 +795,7 @@ int cdx_mcdi_rpc(struct cdx_mcdi *cdx, unsigned int cmd, 
	return cdx_mcdi_rpc_sync(cdx, cmd, inbuf, inlen, outbuf, outlen,

				 outlen_actual, false);

}

EXPORT_SYMBOL_GPL(cdx_mcdi_rpc);



/**

 * cdx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously

include/linux/cdx/mcdi.h

+7 −0
Original line number Diff line number Diff line
@@ -169,6 +169,13 @@ struct cdx_mcdi_data { 
	u32 fn_flags;

};



void cdx_mcdi_finish(struct cdx_mcdi *cdx);

int cdx_mcdi_init(struct cdx_mcdi *cdx);

void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int len);

int cdx_mcdi_rpc(struct cdx_mcdi *cdx, unsigned int cmd,

		 const struct cdx_dword *inbuf, size_t inlen,

		 struct cdx_dword *outbuf, size_t outlen, size_t *outlen_actual);



/*

 * We expect that 16- and 32-bit fields in MCDI requests and responses

 * are appropriately aligned, but 64-bit fields are only