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// SPDX-License-Identifier: GPL-2.0+
// Copyright IBM Corp 2019
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/fsi-occ.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include "common.h"
#define OCC_CHECKSUM_RETRIES 3
struct p9_sbe_occ {
struct occ occ;
bool sbe_error;
void *ffdc;
size_t ffdc_len;
size_t ffdc_size;
struct mutex sbe_error_lock; /* lock access to ffdc data */
struct device *sbe;
};
#define to_p9_sbe_occ(x) container_of((x), struct p9_sbe_occ, occ)
static ssize_t ffdc_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *battr, char *buf, loff_t pos,
size_t count)
{
ssize_t rc = 0;
struct occ *occ = dev_get_drvdata(kobj_to_dev(kobj));
struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
mutex_lock(&ctx->sbe_error_lock);
if (ctx->sbe_error) {
rc = memory_read_from_buffer(buf, count, &pos, ctx->ffdc,
ctx->ffdc_len);
if (pos >= ctx->ffdc_len)
ctx->sbe_error = false;
}
mutex_unlock(&ctx->sbe_error_lock);
return rc;
}
static BIN_ATTR_RO(ffdc, OCC_MAX_RESP_WORDS * 4);
static bool p9_sbe_occ_save_ffdc(struct p9_sbe_occ *ctx, const void *resp,
size_t resp_len)
{
bool notify = false;
mutex_lock(&ctx->sbe_error_lock);
if (!ctx->sbe_error) {
if (resp_len > ctx->ffdc_size) {
kvfree(ctx->ffdc);
ctx->ffdc = kvmalloc(resp_len, GFP_KERNEL);
if (!ctx->ffdc) {
ctx->ffdc_len = 0;
ctx->ffdc_size = 0;
goto done;
}
ctx->ffdc_size = resp_len;
}
notify = true;
ctx->sbe_error = true;
ctx->ffdc_len = resp_len;
memcpy(ctx->ffdc, resp, resp_len);
}
done:
mutex_unlock(&ctx->sbe_error_lock);
return notify;
}
static int p9_sbe_occ_send_cmd(struct occ *occ, u8 *cmd, size_t len,
void *resp, size_t resp_len)
{
size_t original_resp_len = resp_len;
struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
int rc, i;
for (i = 0; i < OCC_CHECKSUM_RETRIES; ++i) {
rc = fsi_occ_submit(ctx->sbe, cmd, len, resp, &resp_len);
if (rc >= 0)
break;
if (resp_len) {
if (p9_sbe_occ_save_ffdc(ctx, resp, resp_len))
sysfs_notify(&occ->bus_dev->kobj, NULL,
bin_attr_ffdc.attr.name);
return rc;
}
if (rc != -EBADE)
return rc;
resp_len = original_resp_len;
}
switch (((struct occ_response *)resp)->return_status) {
case OCC_RESP_CMD_IN_PRG:
rc = -ETIMEDOUT;
break;
case OCC_RESP_SUCCESS:
rc = 0;
break;
case OCC_RESP_CMD_INVAL:
case OCC_RESP_CMD_LEN_INVAL:
case OCC_RESP_DATA_INVAL:
case OCC_RESP_CHKSUM_ERR:
rc = -EINVAL;
break;
case OCC_RESP_INT_ERR:
case OCC_RESP_BAD_STATE:
case OCC_RESP_CRIT_EXCEPT:
case OCC_RESP_CRIT_INIT:
case OCC_RESP_CRIT_WATCHDOG:
case OCC_RESP_CRIT_OCB:
case OCC_RESP_CRIT_HW:
rc = -EREMOTEIO;
break;
default:
rc = -EPROTO;
}
return rc;
}
static int p9_sbe_occ_probe(struct platform_device *pdev)
{
int rc;
struct occ *occ;
struct p9_sbe_occ *ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx),
GFP_KERNEL);
if (!ctx)
return -ENOMEM;
mutex_init(&ctx->sbe_error_lock);
ctx->sbe = pdev->dev.parent;
occ = &ctx->occ;
occ->bus_dev = &pdev->dev;
platform_set_drvdata(pdev, occ);
occ->powr_sample_time_us = 500;
occ->poll_cmd_data = 0x20; /* P9 OCC poll data */
occ->send_cmd = p9_sbe_occ_send_cmd;
rc = occ_setup(occ);
if (rc == -ESHUTDOWN)
rc = -ENODEV; /* Host is shutdown, don't spew errors */
if (!rc) {
rc = device_create_bin_file(occ->bus_dev, &bin_attr_ffdc);
if (rc) {
dev_warn(occ->bus_dev,
"failed to create SBE error ffdc file\n");
rc = 0;
}
}
return rc;
}
static int p9_sbe_occ_remove(struct platform_device *pdev)
{
struct occ *occ = platform_get_drvdata(pdev);
struct p9_sbe_occ *ctx = to_p9_sbe_occ(occ);
device_remove_bin_file(occ->bus_dev, &bin_attr_ffdc);
ctx->sbe = NULL;
occ_shutdown(occ);
kvfree(ctx->ffdc);
return 0;
}
static struct platform_driver p9_sbe_occ_driver = {
.driver = {
.name = "occ-hwmon",
},
.probe = p9_sbe_occ_probe,
.remove = p9_sbe_occ_remove,
};
module_platform_driver(p9_sbe_occ_driver);
MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
MODULE_DESCRIPTION("BMC P9 OCC hwmon driver");
MODULE_LICENSE("GPL");
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