drivers/cdx/controller/mcdi_functions.c

Source file repositories/reference/linux-study-clean/drivers/cdx/controller/mcdi_functions.c

File Facts

System
Linux kernel
Corpus path
drivers/cdx/controller/mcdi_functions.c
Extension
.c
Size
8207 bytes
Lines
257
Domain
Driver Families
Bucket
drivers/cdx
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
 */

#include <linux/module.h>

#include "mcdi_functions.h"

int cdx_mcdi_get_num_buses(struct cdx_mcdi *cdx)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN);
	size_t outlen;
	int ret;

	ret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_BUSES, NULL, 0,
			   outbuf, sizeof(outbuf), &outlen);
	if (ret)
		return ret;

	if (outlen != MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN)
		return -EIO;

	return MCDI_DWORD(outbuf, CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT);
}

int cdx_mcdi_get_num_devs(struct cdx_mcdi *cdx, int bus_num)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN);
	size_t outlen;
	int ret;

	MCDI_SET_DWORD(inbuf, CDX_BUS_ENUM_DEVICES_IN_BUS, bus_num);

	ret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_DEVICES, inbuf, sizeof(inbuf),
			   outbuf, sizeof(outbuf), &outlen);
	if (ret)
		return ret;

	if (outlen != MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN)
		return -EIO;

	return MCDI_DWORD(outbuf, CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT);
}

int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx,
			    u8 bus_num, u8 dev_num,
			    struct cdx_dev_params *dev_params)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN);
	struct resource *res = &dev_params->res[0];
	size_t outlen;
	u32 req_id;
	int ret;

	MCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_BUS, bus_num);
	MCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE, dev_num);

	ret = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG, inbuf, sizeof(inbuf),
			   outbuf, sizeof(outbuf), &outlen);
	if (ret)
		return ret;

	if (outlen != MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_LEN)
		return -EIO;

	dev_params->bus_num = bus_num;
	dev_params->dev_num = dev_num;

	req_id = MCDI_DWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID);
	dev_params->req_id = req_id;

	dev_params->msi_dev_id = MCDI_DWORD(outbuf,
					    CDX_BUS_GET_DEVICE_CONFIG_OUT_V2_REQUESTER_DEVICE_ID);

	dev_params->res_count = 0;
	if (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) != 0) {
		res[dev_params->res_count].start =
			MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE);
		res[dev_params->res_count].end =
			MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE) +
				   MCDI_QWORD(outbuf,
					      CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) - 1;
		res[dev_params->res_count].flags = IORESOURCE_MEM;
		dev_params->res_count++;
	}

	if (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) != 0) {

Annotation

Implementation Notes