[PATCH v6 0/3] drm & vgaarb: handle vgacon removal in vgaarb.

[PATCH v6 0/3] drm & vgaarb: handle vgacon removal in vgaarb.

[Gerd Hoffmann]

v6: buildfix.

Gerd Hoffmann (3):
  drm: move i915_kick_out_vgacon to vgaarb
  drm/fb-helper: call vga_remove_vgacon automatically.
  drm/qxl: remove conflicting framebuffers earlier

 include/drm/drm_fb_helper.h     | 14 +++++++++---
 include/linux/vgaarb.h          |  2 ++
 drivers/gpu/drm/i915/i915_drv.c | 35 +-----------------------------
 drivers/gpu/drm/qxl/qxl_drv.c   |  5 ++++-
 drivers/gpu/vga/vgaarb.c        | 48 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 66 insertions(+), 38 deletions(-)

-- 
2.9.3

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[PATCH v6 1/3] drm: move i915_kick_out_vgacon to vgaarb

[Gerd Hoffmann]

Also rename it to vga_remove_vgacon and add kerneldoc text.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 include/linux/vgaarb.h          |  2 ++
 drivers/gpu/drm/i915/i915_drv.c | 35 +-----------------------------
 drivers/gpu/vga/vgaarb.c        | 48 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 34 deletions(-)

diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
index ee162e3e879b..553b34c8b5f7 100644
--- a/include/linux/vgaarb.h
+++ b/include/linux/vgaarb.h
@@ -125,9 +125,11 @@ extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
 #ifdef CONFIG_VGA_ARB
 extern struct pci_dev *vga_default_device(void);
 extern void vga_set_default_device(struct pci_dev *pdev);
+extern int vga_remove_vgacon(struct pci_dev *pdev);
 #else
 static inline struct pci_dev *vga_default_device(void) { return NULL; };
 static inline void vga_set_default_device(struct pci_dev *pdev) { };
+static inline int vga_remove_vgacon(struct pci_dev *pdev) { return 0; };
 #endif
 
 /*
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 6630212f2faf..9df65d386d11 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -757,39 +757,6 @@ static int i915_kick_out_firmware_fb(struct drm_i915_private *dev_priv)
 	return ret;
 }
 
-#if !defined(CONFIG_VGA_CONSOLE)
-static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
-{
-	return 0;
-}
-#elif !defined(CONFIG_DUMMY_CONSOLE)
-static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
-{
-	return -ENODEV;
-}
-#else
-static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
-{
-	int ret = 0;
-
-	DRM_INFO("Replacing VGA console driver\n");
-
-	console_lock();
-	if (con_is_bound(&vga_con))
-		ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
-	if (ret == 0) {
-		ret = do_unregister_con_driver(&vga_con);
-
-		/* Ignore "already unregistered". */
-		if (ret == -ENODEV)
-			ret = 0;
-	}
-	console_unlock();
-
-	return ret;
-}
-#endif
-
 static void intel_init_dpio(struct drm_i915_private *dev_priv)
 {
 	/*
@@ -1420,7 +1387,7 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
 		goto err_ggtt;
 	}
 
-	ret = i915_kick_out_vgacon(dev_priv);
+	ret = vga_remove_vgacon(pdev);
 	if (ret) {
 		DRM_ERROR("failed to remove conflicting VGA console\n");
 		goto err_ggtt;
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index dc8e039bfab5..dc817104e424 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -48,6 +48,8 @@
 #include <linux/miscdevice.h>
 #include <linux/slab.h>
 #include <linux/screen_info.h>
+#include <linux/vt.h>
+#include <linux/console.h>
 
 #include <linux/uaccess.h>
 
@@ -168,6 +170,52 @@ void vga_set_default_device(struct pci_dev *pdev)
 	vga_default = pci_dev_get(pdev);
 }
 
+/**
+ * vga_remove_vgacon - deactivete vga console
+ *
+ * Unbind and unregister vgacon in case pdev is the default vga
+ * device.  Can be called by gpu drivers on initialization to make
+ * sure vga register access done by vgacon will not disturb the
+ * device.
+ *
+ * @pdev: pci device.
+ */
+#if !defined(CONFIG_VGA_CONSOLE)
+int vga_remove_vgacon(struct pci_dev *pdev)
+{
+        return 0;
+}
+#elif !defined(CONFIG_DUMMY_CONSOLE)
+int vga_remove_vgacon(struct pci_dev *pdev)
+{
+        return -ENODEV;
+}
+#else
+int vga_remove_vgacon(struct pci_dev *pdev)
+{
+        int ret = 0;
+
+	if (pdev != vga_default)
+		return 0;
+	vgaarb_info(&pdev->dev, "deactivate vga console\n");
+
+        console_lock();
+        if (con_is_bound(&vga_con))
+                ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
+        if (ret == 0) {
+                ret = do_unregister_con_driver(&vga_con);
+
+                /* Ignore "already unregistered". */
+                if (ret == -ENODEV)
+                        ret = 0;
+        }
+        console_unlock();
+
+        return ret;
+}
+#endif
+EXPORT_SYMBOL(vga_remove_vgacon);
+
 static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
 {
 	if (vgadev->irq_set_state)
-- 
2.9.3

[PATCH v6 2/3] drm/fb-helper: call vga_remove_vgacon automatically.

[Gerd Hoffmann]

Add vga_remove_vgacon() call to
drm_fb_helper_remove_conflicting_pci_framebuffers().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 include/drm/drm_fb_helper.h | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index bb9acea61369..286d58efed5d 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -36,6 +36,7 @@ struct drm_fb_helper;
 #include <drm/drm_crtc.h>
 #include <drm/drm_device.h>
 #include <linux/kgdb.h>
+#include <linux/vgaarb.h>
 
 enum mode_set_atomic {
 	LEAVE_ATOMIC_MODE_SET,
@@ -642,11 +643,18 @@ drm_fb_helper_remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
 						  int resource_id,
 						  const char *name)
 {
+	int ret = 0;
+
+	/*
+	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
+	 * otherwise the vga fbdev driver falls over.
+	 */
 #if IS_REACHABLE(CONFIG_FB)
-	return remove_conflicting_pci_framebuffers(pdev, resource_id, name);
-#else
-	return 0;
+	ret = remove_conflicting_pci_framebuffers(pdev, resource_id, name);
 #endif
+	if (ret == 0)
+		ret = vga_remove_vgacon(pdev);
+	return ret;
 }
 
 #endif
-- 
2.9.3

[PATCH v6 3/3] drm/qxl: remove conflicting framebuffers earlier

[Gerd Hoffmann]

Add error checking while being at it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/qxl/qxl_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
index bb81e310eb6d..578d867a81d5 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.c
+++ b/drivers/gpu/drm/qxl/qxl_drv.c
@@ -79,6 +79,10 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret)
 		goto free_dev;
 
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "qxl");
+	if (ret)
+		goto disable_pci;
+
 	ret = qxl_device_init(qdev, &qxl_driver, pdev);
 	if (ret)
 		goto disable_pci;
@@ -94,7 +98,6 @@ qxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret)
 		goto modeset_cleanup;
 
-	drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "qxl");
 	drm_fbdev_generic_setup(&qdev->ddev, 32);
 	return 0;
 
-- 
2.9.3