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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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df04ced684
The OCC provides a variety of additional information about the state of the host processor, such as throttling, error conditions, and the number of OCCs detected in the system. This information is essential to service processor applications such as fan control and host management. Therefore, export this data in the form of sysfs attributes attached to the platform device (to which the hwmon device is also attached). Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/fsi-occ.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include "common.h"
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struct p9_sbe_occ {
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struct occ occ;
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struct device *sbe;
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};
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#define to_p9_sbe_occ(x) container_of((x), struct p9_sbe_occ, occ)
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static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd)
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{
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struct occ_response *resp = &occ->resp;
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struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
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size_t resp_len = sizeof(*resp);
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int rc;
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rc = fsi_occ_submit(ctx->sbe, cmd, 8, resp, &resp_len);
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if (rc < 0)
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return rc;
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switch (resp->return_status) {
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case OCC_RESP_CMD_IN_PRG:
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rc = -ETIMEDOUT;
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break;
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case OCC_RESP_SUCCESS:
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rc = 0;
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break;
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case OCC_RESP_CMD_INVAL:
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case OCC_RESP_CMD_LEN_INVAL:
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case OCC_RESP_DATA_INVAL:
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case OCC_RESP_CHKSUM_ERR:
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rc = -EINVAL;
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break;
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case OCC_RESP_INT_ERR:
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case OCC_RESP_BAD_STATE:
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case OCC_RESP_CRIT_EXCEPT:
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case OCC_RESP_CRIT_INIT:
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case OCC_RESP_CRIT_WATCHDOG:
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case OCC_RESP_CRIT_OCB:
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case OCC_RESP_CRIT_HW:
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rc = -EREMOTEIO;
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break;
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default:
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rc = -EPROTO;
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}
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return rc;
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}
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static int p9_sbe_occ_probe(struct platform_device *pdev)
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{
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int rc;
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struct occ *occ;
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struct p9_sbe_occ *ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx),
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GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->sbe = pdev->dev.parent;
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occ = &ctx->occ;
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occ->bus_dev = &pdev->dev;
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platform_set_drvdata(pdev, occ);
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occ->powr_sample_time_us = 500;
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occ->poll_cmd_data = 0x20; /* P9 OCC poll data */
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occ->send_cmd = p9_sbe_occ_send_cmd;
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rc = occ_setup(occ, "p9_occ");
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if (rc == -ESHUTDOWN)
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rc = -ENODEV; /* Host is shutdown, don't spew errors */
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return rc;
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}
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static int p9_sbe_occ_remove(struct platform_device *pdev)
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{
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struct occ *occ = platform_get_drvdata(pdev);
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struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
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ctx->sbe = NULL;
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occ_shutdown(occ);
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return 0;
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}
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static struct platform_driver p9_sbe_occ_driver = {
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.driver = {
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.name = "occ-hwmon",
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},
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.probe = p9_sbe_occ_probe,
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.remove = p9_sbe_occ_remove,
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};
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module_platform_driver(p9_sbe_occ_driver);
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MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
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MODULE_DESCRIPTION("BMC P9 OCC hwmon driver");
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MODULE_LICENSE("GPL");
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