[Intel-gfx] [PATCH 10/11] drm/i915/debugfs: add a separate debugfs file for VBT

[Jani Nikula]

In the future the VBT might not be in mailbox #4 of the ACPI OpRegion,
thus unavailable in i915_opregion, so add a separate file for the VBT.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c   | 22 ++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h       |  1 +
 drivers/gpu/drm/i915/intel_opregion.c |  4 +++-
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index a9e1f18c36d1..aef1393e707f 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1857,6 +1857,27 @@ out:
 	return 0;
 }
 
+static int i915_vbt(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_opregion *opregion = &dev_priv->opregion;
+	int ret;
+
+	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	if (ret)
+		goto out;
+
+	if (opregion->vbt)
+		seq_write(m, opregion->vbt, opregion->vbt_size);
+
+	mutex_unlock(&dev->struct_mutex);
+
+out:
+	return 0;
+}
+
 static int i915_gem_framebuffer_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = m->private;
@@ -5325,6 +5346,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_ips_status", i915_ips_status, 0},
 	{"i915_sr_status", i915_sr_status, 0},
 	{"i915_opregion", i915_opregion, 0},
+	{"i915_vbt", i915_vbt, 0},
 	{"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
 	{"i915_context_status", i915_context_status, 0},
 	{"i915_dump_lrc", i915_dump_lrc, 0},
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 10e47167c594..ca8c2a64bc6d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -458,6 +458,7 @@ struct intel_opregion {
 	u32 swsci_sbcb_sub_functions;
 	struct opregion_asle *asle;
 	const void *vbt;
+	u32 vbt_size;
 	u32 *lid_state;
 	struct work_struct asle_work;
 };
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index f9403b1c8fdd..e89ee2383fe1 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -990,8 +990,10 @@ int intel_opregion_setup(struct drm_device *dev)
 		const void *vbt = base + OPREGION_VBT_OFFSET;
 		u32 vbt_size = OPREGION_ASLE_EXT_OFFSET - OPREGION_VBT_OFFSET;
 
-		if (intel_bios_is_valid_vbt(vbt, vbt_size))
+		if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
 			opregion->vbt = vbt;
+			opregion->vbt_size = vbt_size;
+		}
 	}
 
 	return 0;
-- 
2.1.4