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-rw-r--r--drivers/hwmon/occ/p9_sbe.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
new file mode 100644
index 000000000..96521363b
--- /dev/null
+++ b/drivers/hwmon/occ/p9_sbe.c
@@ -0,0 +1,205 @@
+// 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/mod_devicetable.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 const struct of_device_id p9_sbe_occ_of_match[] = {
+ { .compatible = "ibm,p9-occ-hwmon" },
+ { .compatible = "ibm,p10-occ-hwmon" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, p9_sbe_occ_of_match);
+
+static struct platform_driver p9_sbe_occ_driver = {
+ .driver = {
+ .name = "occ-hwmon",
+ .of_match_table = p9_sbe_occ_of_match,
+ },
+ .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");