edac, highbank: Moving error injection to sysfs for edac

Always have the error injection i/f available, even if there is no
debugfs or EDAC_DEBUG enabled. We need this for testing production
kernels and environments.

Thus, the entry moves from:

 /sys/kernel/debug/edac/mc0/inject_ctrl

to:

 /sys/devices/system/edac/mc/mc0/inject_ctrl

No other changes of the interface.

Signed-off-by: Robert Richter <robert.richter@linaro.org>
Signed-off-by: Robert Richter <rric@kernel.org>

1 files changed, 20 insertions, 35 deletions

diff --git a/drivers/edac/highbank_mc_edac.c b/drivers/edac/highbank_mc_edac.c
index 82211915e3b0..f784de1dc793 100644
--- a/drivers/edac/highbank_mc_edac.c
+++ b/drivers/edac/highbank_mc_edac.c
@@ -95,50 +95,34 @@ static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-#ifdef CONFIG_EDAC_DEBUG
-static ssize_t highbank_mc_err_inject_write(struct file *file,
-                                      const char __user *data,
-                                      size_t count, loff_t *ppos)
+static void highbank_mc_err_inject(struct mem_ctl_info *mci, u8 synd)
 {
-        struct mem_ctl_info *mci = file->private_data;
         struct hb_mc_drvdata *pdata = mci->pvt_info;
-        char buf[32];
-        size_t buf_size;
         u32 reg;
+
+        reg = readl(pdata->mc_err_base + HB_DDR_ECC_OPT);
+        reg &= HB_DDR_ECC_OPT_MODE_MASK;
+        reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
+        writel(reg, pdata->mc_err_base + HB_DDR_ECC_OPT);
+}
+
+#define to_mci(k) container_of(k, struct mem_ctl_info, dev)
+
+static ssize_t highbank_mc_inject_ctrl(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct mem_ctl_info *mci = to_mci(dev);
         u8 synd;
 
-        buf_size = min(count, (sizeof(buf)-1));
-        if (copy_from_user(buf, data, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
+        if (kstrtou8(buf, 16, &synd))
+                return -EINVAL;
 
-        if (!kstrtou8(buf, 16, &synd)) {
-                reg = readl(pdata->mc_err_base + HB_DDR_ECC_OPT);
-                reg &= HB_DDR_ECC_OPT_MODE_MASK;
-                reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
-                writel(reg, pdata->mc_err_base + HB_DDR_ECC_OPT);
-        }
+        highbank_mc_err_inject(mci, synd);
 
         return count;
 }
 
-static const struct file_operations highbank_mc_debug_inject_fops = {
-        .open = simple_open,
-        .write = highbank_mc_err_inject_write,
-        .llseek = generic_file_llseek,
-};
-
-static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
-{
-        if (mci->debugfs)
-                debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
-                                    &highbank_mc_debug_inject_fops);
-;
-}
-#else
-static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
-{}
-#endif
+static DEVICE_ATTR(inject_ctrl, S_IWUSR, NULL, highbank_mc_inject_ctrl);
 
 struct hb_mc_settings {
         int     err_offset;
@@ -259,7 +243,7 @@ static int highbank_mc_probe(struct platform_device *pdev)
                 goto err2;
         }
 
-        highbank_mc_create_debugfs_nodes(mci);
+        device_create_file(&mci->dev, &dev_attr_inject_ctrl);
 
         devres_close_group(&pdev->dev, NULL);
         return 0;
@@ -275,6 +259,7 @@ static int highbank_mc_remove(struct platform_device *pdev)
 {
         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 
+        device_remove_file(&mci->dev, &dev_attr_inject_ctrl);
         edac_mc_del_mc(&pdev->dev);
         edac_mc_free(mci);
         return 0;