mei: add debugfs hooks

debugfs exposes device state and list of me clients and their
properties

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

5 files changed, 185 insertions, 8 deletions

diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index 1b29f7ccac49..3612d576a677 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -11,6 +11,7 @@ mei-objs += main.o
 mei-objs += amthif.o
 mei-objs += wd.o
 mei-objs += bus.o
+mei-$(CONFIG_DEBUG_FS) += debugfs.o
 
 obj-$(CONFIG_INTEL_MEI_ME) += mei-me.o
 mei-me-objs := pci-me.o
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
new file mode 100644
index 000000000000..7135a7186940
--- /dev/null
+++ b/drivers/misc/mei/debugfs.c
@@ -0,0 +1,149 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2012-2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/pci.h>
+
+#include <linux/mei.h>
+
+#include "mei_dev.h"
+#include "hw.h"
+
+static int mei_dbgfs_open(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
+                                        size_t cnt, loff_t *ppos)
+{
+        struct mei_device *dev = fp->private_data;
+        struct mei_me_client *cl;
+        const size_t bufsz = 1024;
+        char *buf = kzalloc(bufsz, GFP_KERNEL);
+        int i;
+        int pos = 0;
+        int ret;
+
+        if  (!buf)
+                return -ENOMEM;
+
+        pos += scnprintf(buf + pos, bufsz - pos,
+                        "  |id|addr|         UUID                       |con|msg len|\n");
+
+        mutex_lock(&dev->device_lock);
+
+        /*  if the driver is not enabled the list won't b consitent */
+        if (dev->dev_state != MEI_DEV_ENABLED)
+                goto out;
+
+        for (i = 0; i < dev->me_clients_num; i++) {
+                cl = &dev->me_clients[i];
+
+                /* skip me clients that cannot be connected */
+                if (cl->props.max_number_of_connections == 0)
+                        continue;
+
+                pos += scnprintf(buf + pos, bufsz - pos,
+                        "%2d|%2d|%4d|%pUl|%3d|%7d|\n",
+                        i, cl->client_id,
+                        cl->props.fixed_address,
+                        &cl->props.protocol_name,
+                        cl->props.max_number_of_connections,
+                        cl->props.max_msg_length);
+        }
+out:
+        mutex_unlock(&dev->device_lock);
+        ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+        kfree(buf);
+        return ret;
+}
+
+static const struct file_operations mei_dbgfs_fops_meclients = {
+        .open = mei_dbgfs_open,
+        .read = mei_dbgfs_read_meclients,
+        .llseek = generic_file_llseek,
+};
+
+static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
+                                        size_t cnt, loff_t *ppos)
+{
+        struct mei_device *dev = fp->private_data;
+        const size_t bufsz = 1024;
+        char *buf = kzalloc(bufsz, GFP_KERNEL);
+        int pos = 0;
+        int ret;
+
+        if  (!buf)
+                return -ENOMEM;
+
+        pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
+                        mei_dev_state_str(dev->dev_state));
+        ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
+        kfree(buf);
+        return ret;
+}
+static const struct file_operations mei_dbgfs_fops_devstate = {
+        .open = mei_dbgfs_open,
+        .read = mei_dbgfs_read_devstate,
+        .llseek = generic_file_llseek,
+};
+
+/**
+ * mei_dbgfs_deregister - Remove the debugfs files and directories
+ * @mei - pointer to mei device private dat
+ */
+void mei_dbgfs_deregister(struct mei_device *dev)
+{
+        if (!dev->dbgfs_dir)
+                return;
+        debugfs_remove_recursive(dev->dbgfs_dir);
+        dev->dbgfs_dir = NULL;
+}
+
+/**
+ * Add the debugfs files
+ *
+ */
+int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+        struct dentry *dir, *f;
+        dir = debugfs_create_dir(name, NULL);
+        if (!dir)
+                return -ENOMEM;
+
+        f = debugfs_create_file("meclients", S_IRUSR, dir,
+                                dev, &mei_dbgfs_fops_meclients);
+        if (!f) {
+                dev_err(&dev->pdev->dev, "meclients: registration failed\n");
+                goto err;
+        }
+        f = debugfs_create_file("devstate", S_IRUSR, dir,
+                                dev, &mei_dbgfs_fops_devstate);
+        if (!f) {
+                dev_err(&dev->pdev->dev, "devstate: registration failed\n");
+                goto err;
+        }
+        dev->dbgfs_dir = dir;
+        return 0;
+err:
+        mei_dbgfs_deregister(dev);
+        return -ENODEV;
+}
+
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c
index 872de9d1494b..329fb865cfd0 100644
--- a/drivers/misc/mei/main.c
+++ b/drivers/misc/mei/main.c
@@ -753,15 +753,25 @@ static struct miscdevice  mei_misc_device = {
                 .minor = MISC_DYNAMIC_MINOR,
 };
 
-int mei_register(struct device *dev)
+
+int mei_register(struct mei_device *dev)
 {
-        mei_misc_device.parent = dev;
-        return misc_register(&mei_misc_device);
+        int ret;
+        mei_misc_device.parent = &dev->pdev->dev;
+        ret = misc_register(&mei_misc_device);
+        if (ret)
+                return ret;
+
+        if (mei_dbgfs_register(dev, mei_misc_device.name))
+                dev_err(&dev->pdev->dev, "cannot register debugfs\n");
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(mei_register);
 
-void mei_deregister(void)
+void mei_deregister(struct mei_device *dev)
 {
+        mei_dbgfs_deregister(dev);
         misc_deregister(&mei_misc_device);
         mei_misc_device.parent = NULL;
 }
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 325f71abeb7a..8806be420f6b 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -437,6 +437,11 @@ struct mei_device {
         /* List of bus devices */
         struct list_head device_list;
 
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+        struct dentry *dbgfs_dir;
+#endif /* CONFIG_DEBUG_FS */
+
+
         const struct mei_hw_ops *ops;
         char hw[0] __aligned(sizeof(void *));
 };
@@ -603,8 +608,19 @@ static inline int mei_count_full_read_slots(struct mei_device *dev)
         return dev->ops->rdbuf_full_slots(dev);
 }
 
-int mei_register(struct device *dev);
-void mei_deregister(void);
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int mei_dbgfs_register(struct mei_device *dev, const char *name);
+void mei_dbgfs_deregister(struct mei_device *dev);
+#else
+static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
+{
+        return 0;
+}
+static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
+#endif /* CONFIG_DEBUG_FS */
+
+int mei_register(struct mei_device *dev);
+void mei_deregister(struct mei_device *dev);
 
 #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
 #define MEI_HDR_PRM(hdr)                  \
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index a1a582b66f0d..88aec6a90ff4 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -190,7 +190,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
                 goto release_irq;
         }
 
-        err = mei_register(&pdev->dev);
+        err = mei_register(dev);
         if (err)
                 goto release_irq;
 
@@ -262,12 +262,13 @@ static void mei_me_remove(struct pci_dev *pdev)
         if (hw->mem_addr)
                 pci_iounmap(pdev, hw->mem_addr);
 
+        mei_deregister(dev);
+
         kfree(dev);
 
         pci_release_regions(pdev);
         pci_disable_device(pdev);
 
-        mei_deregister();
 
 }
 #ifdef CONFIG_PM