[PATCH v3 08/10] drm/xe/xe_late_bind_fw: Introduce debug fs node to disable late binding

[Badal Nilawar <badal.nilawar@intel.com>]

Introduce a debug filesystem node to disable late binding fw reload
during the system or runtime resume. This is intended for situations
where the late binding fw needs to be loaded from user mode.

v2:
  -s/(uval == 1) ? true : false/!!uval/ (Daniele)

Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
---
 drivers/gpu/drm/xe/xe_debugfs.c            | 41 ++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_late_bind_fw.c       |  3 ++
 drivers/gpu/drm/xe/xe_late_bind_fw_types.h |  3 ++
 3 files changed, 47 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index d83cd6ed3fa8..d1f6f556efa2 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -226,6 +226,44 @@ static const struct file_operations atomic_svm_timeslice_ms_fops = {
 	.write = atomic_svm_timeslice_ms_set,
 };
 
+static ssize_t disable_late_binding_show(struct file *f, char __user *ubuf,
+					 size_t size, loff_t *pos)
+{
+	struct xe_device *xe = file_inode(f)->i_private;
+	struct xe_late_bind *late_bind = &xe->late_bind;
+	char buf[32];
+	int len;
+
+	len = scnprintf(buf, sizeof(buf), "%d\n", late_bind->disable);
+
+	return simple_read_from_buffer(ubuf, size, pos, buf, len);
+}
+
+static ssize_t disable_late_binding_set(struct file *f, const char __user *ubuf,
+					size_t size, loff_t *pos)
+{
+	struct xe_device *xe = file_inode(f)->i_private;
+	struct xe_late_bind *late_bind = &xe->late_bind;
+	u32 uval;
+	ssize_t ret;
+
+	ret = kstrtouint_from_user(ubuf, size, sizeof(uval), &uval);
+	if (ret)
+		return ret;
+
+	if (uval > 1)
+		return -EINVAL;
+
+	late_bind->disable = !!uval;
+	return size;
+}
+
+static const struct file_operations disable_late_binding_fops = {
+	.owner = THIS_MODULE,
+	.read = disable_late_binding_show,
+	.write = disable_late_binding_set,
+};
+
 void xe_debugfs_register(struct xe_device *xe)
 {
 	struct ttm_device *bdev = &xe->ttm;
@@ -249,6 +287,9 @@ void xe_debugfs_register(struct xe_device *xe)
 	debugfs_create_file("atomic_svm_timeslice_ms", 0600, root, xe,
 			    &atomic_svm_timeslice_ms_fops);
 
+	debugfs_create_file("disable_late_binding", 0600, root, xe,
+			    &disable_late_binding_fops);
+
 	for (mem_type = XE_PL_VRAM0; mem_type <= XE_PL_VRAM1; ++mem_type) {
 		man = ttm_manager_type(bdev, mem_type);
 
diff --git a/drivers/gpu/drm/xe/xe_late_bind_fw.c b/drivers/gpu/drm/xe/xe_late_bind_fw.c
index c0be9611c73b..001e526e569a 100644
--- a/drivers/gpu/drm/xe/xe_late_bind_fw.c
+++ b/drivers/gpu/drm/xe/xe_late_bind_fw.c
@@ -129,6 +129,9 @@ int xe_late_bind_fw_load(struct xe_late_bind *late_bind)
 	if (!late_bind->component_added)
 		return -EINVAL;
 
+	if (late_bind->disable)
+		return 0;
+
 	for (fw_id = 0; fw_id < MAX_FW_ID; fw_id++) {
 		lbfw = &late_bind->late_bind_fw[fw_id];
 		if (lbfw->valid)
diff --git a/drivers/gpu/drm/xe/xe_late_bind_fw_types.h b/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
index d256f53d59e6..f79f0c0b2c4a 100644
--- a/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
+++ b/drivers/gpu/drm/xe/xe_late_bind_fw_types.h
@@ -71,6 +71,9 @@ struct xe_late_bind {
 	struct xe_late_bind_fw late_bind_fw[MAX_FW_ID];
 	/** @late_bind.wq: workqueue to submit request to download late bind blob */
 	struct workqueue_struct *wq;
+
+	/** @late_bind.disable to block late binding reload during pm resume flow*/
+	bool disable;
 };
 
 #endif
-- 
2.34.1