struct device *dev;
struct dentry *dentry;
struct list_head list;
+ unsigned long reg_offset;
};
static int iommu_debug_attachment_info_show(struct seq_file *s, void *ignored)
.write = iommu_debug_attachment_trigger_fault_write,
};
+static ssize_t iommu_debug_attachment_reg_offset_write(
+ struct file *file, const char __user *ubuf, size_t count,
+ loff_t *offset)
+{
+ struct iommu_debug_attachment *attach = file->private_data;
+ unsigned long reg_offset;
+
+ if (kstrtoul_from_user(ubuf, count, 0, ®_offset)) {
+ pr_err("Invalid reg_offset format\n");
+ return -EFAULT;
+ }
+
+ attach->reg_offset = reg_offset;
+
+ return count;
+}
+
+static const struct file_operations iommu_debug_attachment_reg_offset_fops = {
+ .open = simple_open,
+ .write = iommu_debug_attachment_reg_offset_write,
+};
+
+static ssize_t iommu_debug_attachment_reg_read_read(
+ struct file *file, char __user *ubuf, size_t count, loff_t *offset)
+{
+ struct iommu_debug_attachment *attach = file->private_data;
+ unsigned long val;
+ char *val_str;
+ ssize_t val_str_len;
+
+ if (*offset)
+ return 0;
+
+ val = iommu_reg_read(attach->domain, attach->reg_offset);
+ val_str = kasprintf(GFP_KERNEL, "0x%lx\n", val);
+ if (!val_str)
+ return -ENOMEM;
+ val_str_len = strlen(val_str);
+
+ if (copy_to_user(ubuf, val_str, val_str_len)) {
+ pr_err("copy_to_user failed\n");
+ val_str_len = -EFAULT;
+ goto out;
+ }
+ *offset = 1; /* non-zero means we're done */
+
+out:
+ kfree(val_str);
+ return val_str_len;
+}
+
+static const struct file_operations iommu_debug_attachment_reg_read_fops = {
+ .open = simple_open,
+ .read = iommu_debug_attachment_reg_read_read,
+};
+
+static ssize_t iommu_debug_attachment_reg_write_write(
+ struct file *file, const char __user *ubuf, size_t count,
+ loff_t *offset)
+{
+ struct iommu_debug_attachment *attach = file->private_data;
+ unsigned long val;
+
+ if (kstrtoul_from_user(ubuf, count, 0, &val)) {
+ pr_err("Invalid val format\n");
+ return -EFAULT;
+ }
+
+ iommu_reg_write(attach->domain, attach->reg_offset, val);
+
+ return count;
+}
+
+static const struct file_operations iommu_debug_attachment_reg_write_fops = {
+ .open = simple_open,
+ .write = iommu_debug_attachment_reg_write_write,
+};
+
/* should be called with iommu_debug_attachments_lock locked */
static int iommu_debug_attach_add_debugfs(
struct iommu_debug_attachment *attach)
goto err_rmdir;
}
+ if (!debugfs_create_file(
+ "reg_offset", S_IRUSR, attach->dentry, attach,
+ &iommu_debug_attachment_reg_offset_fops)) {
+ pr_err("Couldn't create iommu/attachments/%s/reg_offset debugfs file for domain 0x%p\n",
+ dev_name(dev), domain);
+ goto err_rmdir;
+ }
+
+ if (!debugfs_create_file(
+ "reg_read", S_IRUSR, attach->dentry, attach,
+ &iommu_debug_attachment_reg_read_fops)) {
+ pr_err("Couldn't create iommu/attachments/%s/reg_read debugfs file for domain 0x%p\n",
+ dev_name(dev), domain);
+ goto err_rmdir;
+ }
+
+ if (!debugfs_create_file(
+ "reg_write", S_IRUSR, attach->dentry, attach,
+ &iommu_debug_attachment_reg_write_fops)) {
+ pr_err("Couldn't create iommu/attachments/%s/reg_write debugfs file for domain 0x%p\n",
+ dev_name(dev), domain);
+ goto err_rmdir;
+ }
+
return 0;
err_rmdir: