[PATCH v4 1/2] drm/xe: add a new debugfs file - mmio

[Koby Elbaz]

Now that the former mmio handlers are fully removed, this
debugfs file will be used for mmio access (read/write)
through the debugfs ioctl file operation.

Signed-off-by: Koby Elbaz <kelbaz at habana.ai>
---
 drivers/gpu/drm/xe/xe_debugfs.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index c56fd7d59f05..c24637ff09d8 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -97,12 +97,22 @@ static int forcewake_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
+static long xe_debugfs_mmio_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+	return 0;
+}
+
 static const struct file_operations forcewake_all_fops = {
 	.owner = THIS_MODULE,
 	.open = forcewake_open,
 	.release = forcewake_release,
 };
 
+static const struct file_operations mmio_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = xe_debugfs_mmio_ioctl,
+};
+
 void xe_debugfs_register(struct xe_device *xe)
 {
 	struct ttm_device *bdev = &xe->ttm;
@@ -141,6 +151,8 @@ void xe_debugfs_register(struct xe_device *xe)
 	for_each_gt(gt, xe, id)
 		xe_gt_debugfs_register(gt);
 
+	debugfs_create_file("mmio", 0644, root, xe, &mmio_fops);
+
 #ifdef CONFIG_FAULT_INJECTION
 	fault_create_debugfs_attr("fail_gt_reset", root, &gt_reset_failure);
 #endif
-- 
2.34.1