1 files changed, 461 insertions, 0 deletions

diff --git a/drivers/misc/mic/cosm/cosm_sysfs.c b/drivers/misc/mic/cosm/cosm_sysfs.c
new file mode 100644
index 000000000000..29d6863b6e59
--- /dev/null
+++ b/drivers/misc/mic/cosm/cosm_sysfs.c
@@ -0,0 +1,461 @@
+/*
+ * Intel MIC Platform Software Stack (MPSS)
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Intel MIC Coprocessor State Management (COSM) Driver
+ *
+ */
+#include <linux/slab.h>
+#include "cosm_main.h"
+
+/*
+ * A state-to-string lookup table, for exposing a human readable state
+ * via sysfs. Always keep in sync with enum cosm_states
+ */
+const char * const cosm_state_string[] = {
+        [MIC_READY] = "ready",
+        [MIC_BOOTING] = "booting",
+        [MIC_ONLINE] = "online",
+        [MIC_SHUTTING_DOWN] = "shutting_down",
+        [MIC_RESETTING] = "resetting",
+        [MIC_RESET_FAILED] = "reset_failed",
+};
+
+/*
+ * A shutdown-status-to-string lookup table, for exposing a human
+ * readable state via sysfs. Always keep in sync with enum cosm_shutdown_status
+ */
+const char * const cosm_shutdown_status_string[] = {
+        [MIC_NOP] = "nop",
+        [MIC_CRASHED] = "crashed",
+        [MIC_HALTED] = "halted",
+        [MIC_POWER_OFF] = "poweroff",
+        [MIC_RESTART] = "restart",
+};
+
+void cosm_set_shutdown_status(struct cosm_device *cdev, u8 shutdown_status)
+{
+        dev_dbg(&cdev->dev, "Shutdown Status %s -> %s\n",
+                cosm_shutdown_status_string[cdev->shutdown_status],
+                cosm_shutdown_status_string[shutdown_status]);
+        cdev->shutdown_status = shutdown_status;
+}
+
+void cosm_set_state(struct cosm_device *cdev, u8 state)
+{
+        dev_dbg(&cdev->dev, "State %s -> %s\n",
+                cosm_state_string[cdev->state],
+                cosm_state_string[state]);
+        cdev->state = state;
+        sysfs_notify_dirent(cdev->state_sysfs);
+}
+
+static ssize_t
+family_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        return cdev->hw_ops->family(cdev, buf);
+}
+static DEVICE_ATTR_RO(family);
+
+static ssize_t
+stepping_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        return cdev->hw_ops->stepping(cdev, buf);
+}
+static DEVICE_ATTR_RO(stepping);
+
+static ssize_t
+state_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev || cdev->state >= MIC_LAST)
+                return -EINVAL;
+
+        return scnprintf(buf, PAGE_SIZE, "%s\n",
+                cosm_state_string[cdev->state]);
+}
+
+static ssize_t
+state_store(struct device *dev, struct device_attribute *attr,
+            const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        int rc;
+
+        if (!cdev)
+                return -EINVAL;
+
+        if (sysfs_streq(buf, "boot")) {
+                rc = cosm_start(cdev);
+                goto done;
+        }
+        if (sysfs_streq(buf, "reset")) {
+                rc = cosm_reset(cdev);
+                goto done;
+        }
+
+        if (sysfs_streq(buf, "shutdown")) {
+                rc = cosm_shutdown(cdev);
+                goto done;
+        }
+        rc = -EINVAL;
+done:
+        if (rc)
+                count = rc;
+        return count;
+}
+static DEVICE_ATTR_RW(state);
+
+static ssize_t shutdown_status_show(struct device *dev,
+                                    struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev || cdev->shutdown_status >= MIC_STATUS_LAST)
+                return -EINVAL;
+
+        return scnprintf(buf, PAGE_SIZE, "%s\n",
+                cosm_shutdown_status_string[cdev->shutdown_status]);
+}
+static DEVICE_ATTR_RO(shutdown_status);
+
+static ssize_t
+heartbeat_enable_show(struct device *dev,
+                      struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        return scnprintf(buf, PAGE_SIZE, "%d\n", cdev->sysfs_heartbeat_enable);
+}
+
+static ssize_t
+heartbeat_enable_store(struct device *dev,
+                       struct device_attribute *attr,
+                       const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        int enable;
+        int ret;
+
+        if (!cdev)
+                return -EINVAL;
+
+        mutex_lock(&cdev->cosm_mutex);
+        ret = kstrtoint(buf, 10, &enable);
+        if (ret)
+                goto unlock;
+
+        cdev->sysfs_heartbeat_enable = enable;
+        /* if state is not online, cdev->heartbeat_watchdog_enable is 0 */
+        if (cdev->state == MIC_ONLINE)
+                cdev->heartbeat_watchdog_enable = enable;
+        ret = count;
+unlock:
+        mutex_unlock(&cdev->cosm_mutex);
+        return ret;
+}
+static DEVICE_ATTR_RW(heartbeat_enable);
+
+static ssize_t
+cmdline_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        char *cmdline;
+
+        if (!cdev)
+                return -EINVAL;
+
+        cmdline = cdev->cmdline;
+
+        if (cmdline)
+                return scnprintf(buf, PAGE_SIZE, "%s\n", cmdline);
+        return 0;
+}
+
+static ssize_t
+cmdline_store(struct device *dev, struct device_attribute *attr,
+              const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        mutex_lock(&cdev->cosm_mutex);
+        kfree(cdev->cmdline);
+
+        cdev->cmdline = kmalloc(count + 1, GFP_KERNEL);
+        if (!cdev->cmdline) {
+                count = -ENOMEM;
+                goto unlock;
+        }
+
+        strncpy(cdev->cmdline, buf, count);
+
+        if (cdev->cmdline[count - 1] == '\n')
+                cdev->cmdline[count - 1] = '\0';
+        else
+                cdev->cmdline[count] = '\0';
+unlock:
+        mutex_unlock(&cdev->cosm_mutex);
+        return count;
+}
+static DEVICE_ATTR_RW(cmdline);
+
+static ssize_t
+firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        char *firmware;
+
+        if (!cdev)
+                return -EINVAL;
+
+        firmware = cdev->firmware;
+
+        if (firmware)
+                return scnprintf(buf, PAGE_SIZE, "%s\n", firmware);
+        return 0;
+}
+
+static ssize_t
+firmware_store(struct device *dev, struct device_attribute *attr,
+               const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        mutex_lock(&cdev->cosm_mutex);
+        kfree(cdev->firmware);
+
+        cdev->firmware = kmalloc(count + 1, GFP_KERNEL);
+        if (!cdev->firmware) {
+                count = -ENOMEM;
+                goto unlock;
+        }
+        strncpy(cdev->firmware, buf, count);
+
+        if (cdev->firmware[count - 1] == '\n')
+                cdev->firmware[count - 1] = '\0';
+        else
+                cdev->firmware[count] = '\0';
+unlock:
+        mutex_unlock(&cdev->cosm_mutex);
+        return count;
+}
+static DEVICE_ATTR_RW(firmware);
+
+static ssize_t
+ramdisk_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        char *ramdisk;
+
+        if (!cdev)
+                return -EINVAL;
+
+        ramdisk = cdev->ramdisk;
+
+        if (ramdisk)
+                return scnprintf(buf, PAGE_SIZE, "%s\n", ramdisk);
+        return 0;
+}
+
+static ssize_t
+ramdisk_store(struct device *dev, struct device_attribute *attr,
+              const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        mutex_lock(&cdev->cosm_mutex);
+        kfree(cdev->ramdisk);
+
+        cdev->ramdisk = kmalloc(count + 1, GFP_KERNEL);
+        if (!cdev->ramdisk) {
+                count = -ENOMEM;
+                goto unlock;
+        }
+
+        strncpy(cdev->ramdisk, buf, count);
+
+        if (cdev->ramdisk[count - 1] == '\n')
+                cdev->ramdisk[count - 1] = '\0';
+        else
+                cdev->ramdisk[count] = '\0';
+unlock:
+        mutex_unlock(&cdev->cosm_mutex);
+        return count;
+}
+static DEVICE_ATTR_RW(ramdisk);
+
+static ssize_t
+bootmode_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        char *bootmode;
+
+        if (!cdev)
+                return -EINVAL;
+
+        bootmode = cdev->bootmode;
+
+        if (bootmode)
+                return scnprintf(buf, PAGE_SIZE, "%s\n", bootmode);
+        return 0;
+}
+
+static ssize_t
+bootmode_store(struct device *dev, struct device_attribute *attr,
+               const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        if (!sysfs_streq(buf, "linux") && !sysfs_streq(buf, "flash"))
+                return -EINVAL;
+
+        mutex_lock(&cdev->cosm_mutex);
+        kfree(cdev->bootmode);
+
+        cdev->bootmode = kmalloc(count + 1, GFP_KERNEL);
+        if (!cdev->bootmode) {
+                count = -ENOMEM;
+                goto unlock;
+        }
+
+        strncpy(cdev->bootmode, buf, count);
+
+        if (cdev->bootmode[count - 1] == '\n')
+                cdev->bootmode[count - 1] = '\0';
+        else
+                cdev->bootmode[count] = '\0';
+unlock:
+        mutex_unlock(&cdev->cosm_mutex);
+        return count;
+}
+static DEVICE_ATTR_RW(bootmode);
+
+static ssize_t
+log_buf_addr_show(struct device *dev, struct device_attribute *attr,
+                  char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_addr);
+}
+
+static ssize_t
+log_buf_addr_store(struct device *dev, struct device_attribute *attr,
+                   const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        int ret;
+        unsigned long addr;
+
+        if (!cdev)
+                return -EINVAL;
+
+        ret = kstrtoul(buf, 16, &addr);
+        if (ret)
+                goto exit;
+
+        cdev->log_buf_addr = (void *)addr;
+        ret = count;
+exit:
+        return ret;
+}
+static DEVICE_ATTR_RW(log_buf_addr);
+
+static ssize_t
+log_buf_len_show(struct device *dev, struct device_attribute *attr,
+                 char *buf)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+
+        if (!cdev)
+                return -EINVAL;
+
+        return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_len);
+}
+
+static ssize_t
+log_buf_len_store(struct device *dev, struct device_attribute *attr,
+                  const char *buf, size_t count)
+{
+        struct cosm_device *cdev = dev_get_drvdata(dev);
+        int ret;
+        unsigned long addr;
+
+        if (!cdev)
+                return -EINVAL;
+
+        ret = kstrtoul(buf, 16, &addr);
+        if (ret)
+                goto exit;
+
+        cdev->log_buf_len = (int *)addr;
+        ret = count;
+exit:
+        return ret;
+}
+static DEVICE_ATTR_RW(log_buf_len);
+
+static struct attribute *cosm_default_attrs[] = {
+        &dev_attr_family.attr,
+        &dev_attr_stepping.attr,
+        &dev_attr_state.attr,
+        &dev_attr_shutdown_status.attr,
+        &dev_attr_heartbeat_enable.attr,
+        &dev_attr_cmdline.attr,
+        &dev_attr_firmware.attr,
+        &dev_attr_ramdisk.attr,
+        &dev_attr_bootmode.attr,
+        &dev_attr_log_buf_addr.attr,
+        &dev_attr_log_buf_len.attr,
+
+        NULL
+};
+
+ATTRIBUTE_GROUPS(cosm_default);
+
+void cosm_sysfs_init(struct cosm_device *cdev)
+{
+        cdev->attr_group = cosm_default_groups;
+}