[PATCH v2 00/12] remove_conflicting_framebuffers() cleanup

[PATCH v2 00/12] remove_conflicting_framebuffers() cleanup

[Michał Mirosław]

This series cleans up duplicated code for replacing firmware FB
driver with proper DRI driver and adds handover support to
Tegra driver.

This is a sligtly updated version of a series sent on 24 Nov 2017.

v2:
 - rebased on current drm-next
 - dropped staging/sm750fb changes
 - added kernel docs for DRM helpers

Michał Mirosław (12):
  fbdev: show fbdev number for debugging
  fbdev: allow apertures = NULL in remove_conflicting_framebuffers()
  fbdev: add remove_conflicting_pci_framebuffers()
  drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
  drm/bochs: use simpler remove_conflicting_pci_framebuffers()
  drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
  drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
  drm/radeon: use simpler remove_conflicting_pci_framebuffers()
  drm/virtio: use simpler remove_conflicting_pci_framebuffers()
  drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
  drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
  drm/tegra: kick out simplefb

 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 +-------------
 drivers/gpu/drm/bochs/bochs_drv.c        | 18 +----------
 drivers/gpu/drm/cirrus/cirrus_drv.c      | 23 +-------------
 drivers/gpu/drm/mgag200/mgag200_drv.c    | 21 +------------
 drivers/gpu/drm/mgag200/mgag200_main.c   |  9 ------
 drivers/gpu/drm/radeon/radeon_drv.c      | 23 +-------------
 drivers/gpu/drm/sun4i/sun4i_drv.c        | 18 +----------
 drivers/gpu/drm/tegra/drm.c              |  4 +++
 drivers/gpu/drm/vc4/vc4_drv.c            | 20 +-----------
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 ++------------
 drivers/video/fbdev/core/fbmem.c         | 40 ++++++++++++++++++++++--
 include/drm/drm_fb_helper.h              | 34 ++++++++++++++++++++
 include/linux/fb.h                       |  2 ++
 13 files changed, 88 insertions(+), 172 deletions(-)

-- 
2.18.0

[PATCH v2 02/12] fbdev: allow apertures == NULL in remove_conflicting_framebuffers()

[Michał Mirosław]

Interpret (otherwise-invalid) NULL apertures argument to mean all-memory
range. This will allow to remove several duplicates of this code from
drivers in following patches.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
[for v1]
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

---
v2: added kerneldoc to corresponding DRM helper
---
 drivers/video/fbdev/core/fbmem.c | 14 ++++++++++++++
 include/drm/drm_fb_helper.h      | 10 ++++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 30a18d4c9de4..0df148eb4699 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1779,11 +1779,25 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 				    const char *name, bool primary)
 {
 	int ret;
+	bool do_free = false;
+
+	if (!a) {
+		a = alloc_apertures(1);
+		if (!a)
+			return -ENOMEM;
+
+		a->ranges[0].base = 0;
+		a->ranges[0].size = ~0;
+		do_free = true;
+	}
 
 	mutex_lock(&registration_lock);
 	ret = do_remove_conflicting_framebuffers(a, name, primary);
 	mutex_unlock(&registration_lock);
 
+	if (do_free)
+		kfree(a);
+
 	return ret;
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index b069433e7fc1..1c1e53abb25d 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -566,6 +566,16 @@ static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev)
 
 #endif
 
+/**
+ * drm_fb_helper_remove_conflicting_framebuffers - remove firmware framebuffers
+ * @a: memory range, users of which are to be removed
+ * @name: requesting driver name
+ * @primary: also kick vga16fb if present
+ *
+ * This function removes framebuffer devices (eg. initialized by firmware)
+ * which use memory range described by @a. If @a is NULL all such devices are
+ * removed.
+ */
 static inline int
 drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
 					      const char *name, bool primary)
-- 
2.18.0

[PATCH v2 01/12] fbdev: show fbdev number for debugging

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/video/fbdev/core/fbmem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index f741ba8df01b..30a18d4c9de4 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1618,8 +1618,8 @@ static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
 			(primary && gen_aper && gen_aper->count &&
 			 gen_aper->ranges[0].base = VGA_FB_PHYS)) {
 
-			printk(KERN_INFO "fb: switching to %s from %s\n",
-			       name, registered_fb[i]->fix.id);
+			printk(KERN_INFO "fb%d: switching to %s from %s\n",
+			       i, name, registered_fb[i]->fix.id);
 			ret = do_unregister_framebuffer(registered_fb[i]);
 			if (ret)
 				return ret;
-- 
2.18.0

[PATCH v2 03/12] fbdev: add remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Almost all PCI drivers using remove_conflicting_framebuffers() wrap it
with the same code.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
[for v1]
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

---
v2: add kerneldoc for DRM helper
---
 drivers/video/fbdev/core/fbmem.c | 22 ++++++++++++++++++++++
 include/drm/drm_fb_helper.h      | 24 ++++++++++++++++++++++++
 include/linux/fb.h               |  2 ++
 3 files changed, 48 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 0df148eb4699..927e016487e9 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -34,6 +34,7 @@
 #include <linux/fb.h>
 #include <linux/fbcon.h>
 #include <linux/mem_encrypt.h>
+#include <linux/pci.h>
 
 #include <asm/fb.h>
 
@@ -1802,6 +1803,27 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
 
+int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
+{
+	struct apertures_struct *ap;
+	bool primary = false;
+
+	ap = alloc_apertures(1);
+	if (!ap)
+		return -ENOMEM;
+
+	ap->ranges[0].base = pci_resource_start(pdev, res_id);
+	ap->ranges[0].size = pci_resource_len(pdev, res_id);
+#ifdef CONFIG_X86
+	primary = pdev->resource[PCI_ROM_RESOURCE].flags &
+					IORESOURCE_ROM_SHADOW;
+#endif
+	remove_conflicting_framebuffers(ap, name, primary);
+	kfree(ap);
+	return 0;
+}
+EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
+
 /**
  *	register_framebuffer - registers a frame buffer device
  *	@fb_info: frame buffer info structure
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 1c1e53abb25d..6e1fc52d1b1b 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -587,4 +587,28 @@ drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
 #endif
 }
 
+/**
+ * drm_fb_helper_remove_conflicting_framebuffers - remove firmware framebuffers for PCI devices
+ * @pdev: PCI device being driven
+ * @resource_id: index of PCI BAR configuring framebuffer memory
+ * @name: requesting driver name
+ *
+ * This function removes framebuffer devices (eg. initialized by firmware)
+ * using memory range configured for @pdev's BAR @resource_id.
+ *
+ * The function assumes that PCI device with shadowed ROM is drives a primary
+ * display and so kicks out vga16fb.
+ */
+static inline int
+drm_fb_helper_remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
+						  int resource_id,
+						  const char *name)
+{
+#if IS_REACHABLE(CONFIG_FB)
+	return remove_conflicting_pci_framebuffers(pdev, resource_id, name);
+#else
+	return 0;
+#endif
+}
+
 #endif
diff --git a/include/linux/fb.h b/include/linux/fb.h
index aa74a228bb92..abeffd55b66a 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -632,6 +632,8 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
 extern int register_framebuffer(struct fb_info *fb_info);
 extern int unregister_framebuffer(struct fb_info *fb_info);
 extern int unlink_framebuffer(struct fb_info *fb_info);
+extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id,
+					       const char *name);
 extern int remove_conflicting_framebuffers(struct apertures_struct *a,
 					   const char *name, bool primary);
 extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
-- 
2.18.0

[PATCH v2 04/12] drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 0b19482b36b8..9b6e037719db 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -560,28 +560,6 @@ MODULE_DEVICE_TABLE(pci, pciidlist);
 
 static struct drm_driver kms_driver;
 
-static int amdgpu_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "amdgpudrmfb", primary);
-	kfree(ap);
-
-	return 0;
-}
-
-
 static int amdgpu_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
@@ -609,7 +587,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 		return ret;
 
 	/* Get rid of things like offb */
-	ret = amdgpu_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "amdgpudrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v2 05/12] drm/bochs: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/bochs/bochs_drv.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index 7b20318483e4..c61b40c72b62 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -143,22 +143,6 @@ static const struct dev_pm_ops bochs_pm_ops = {
 /* ---------------------------------------------------------------------- */
 /* pci interface                                                          */
 
-static int bochs_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "bochsdrmfb", false);
-	kfree(ap);
-
-	return 0;
-}
-
 static int bochs_pci_probe(struct pci_dev *pdev,
 			   const struct pci_device_id *ent)
 {
@@ -171,7 +155,7 @@ static int bochs_pci_probe(struct pci_dev *pdev,
 		return -ENOMEM;
 	}
 
-	ret = bochs_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "bochsdrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v2 06/12] drm/cirrus: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/cirrus/cirrus_drv.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.c b/drivers/gpu/drm/cirrus/cirrus_drv.c
index 69c4e352dd78..85ed8657c862 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.c
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.c
@@ -42,33 +42,12 @@ static const struct pci_device_id pciidlist[] = {
 };
 
 
-static int cirrus_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "cirrusdrmfb", primary);
-	kfree(ap);
-
-	return 0;
-}
-
 static int cirrus_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
 	int ret;
 
-	ret = cirrus_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "cirrusdrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v2 07/12] drm/mgag200: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Remove duplicated call, while at it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/mgag200/mgag200_drv.c  | 21 +--------------------
 drivers/gpu/drm/mgag200/mgag200_main.c |  9 ---------
 2 files changed, 1 insertion(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
index 74cdde2ee474..ac6af4bd9df6 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.c
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
@@ -42,29 +42,10 @@ static const struct pci_device_id pciidlist[] = {
 
 MODULE_DEVICE_TABLE(pci, pciidlist);
 
-static void mgag200_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "mgag200drmfb", primary);
-	kfree(ap);
-}
-
 
 static int mga_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	mgag200_kick_out_firmware_fb(pdev);
+	drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "mgag200drmfb");
 
 	return drm_get_pci_dev(pdev, ent, &driver);
 }
diff --git a/drivers/gpu/drm/mgag200/mgag200_main.c b/drivers/gpu/drm/mgag200/mgag200_main.c
index 780f983b0294..79d54103d470 100644
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -124,20 +124,11 @@ static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 static int mga_vram_init(struct mga_device *mdev)
 {
 	void __iomem *mem;
-	struct apertures_struct *aper = alloc_apertures(1);
-	if (!aper)
-		return -ENOMEM;
 
 	/* BAR 0 is VRAM */
 	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
 	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
 
-	aper->ranges[0].base = mdev->mc.vram_base;
-	aper->ranges[0].size = mdev->mc.vram_window;
-
-	drm_fb_helper_remove_conflicting_framebuffers(aper, "mgafb", true);
-	kfree(aper);
-
 	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
 				"mgadrmfb_vram")) {
 		DRM_ERROR("can't reserve VRAM\n");
-- 
2.18.0

[PATCH v2 08/12] drm/radeon: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/radeon/radeon_drv.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index b28288a781ef..36c98a0ec991 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -311,27 +311,6 @@ static struct drm_driver kms_driver;
 
 bool radeon_device_is_virtual(void);
 
-static int radeon_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "radeondrmfb", primary);
-	kfree(ap);
-
-	return 0;
-}
-
 static int radeon_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
@@ -341,7 +320,7 @@ static int radeon_pci_probe(struct pci_dev *pdev,
 		return -EPROBE_DEFER;
 
 	/* Get rid of things like offb */
-	ret = radeon_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "radeondrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v2 09/12] drm/virtio: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
index 7df8d0c9026a..115ed546ca4e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -28,26 +28,6 @@
 
 #include "virtgpu_drv.h"
 
-static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
-{
-	struct apertures_struct *ap;
-	bool primary;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	ap->ranges[0].base = pci_resource_start(pci_dev, 0);
-	ap->ranges[0].size = pci_resource_len(pci_dev, 0);
-
-	primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
-		& IORESOURCE_ROM_SHADOW;
-
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
-
-	kfree(ap);
-}
-
 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 {
 	struct drm_device *dev;
@@ -69,7 +49,9 @@ int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 			 pname);
 		dev->pdev = pdev;
 		if (vga)
-			virtio_pci_kick_out_firmware_fb(pdev);
+			drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
+									  0,
+									  "virtiodrmfb");
 
 		snprintf(unique, sizeof(unique), "pci:%s", pname);
 		ret = drm_dev_set_unique(dev, unique);
-- 
2.18.0

[PATCH v2 10/12] drm/vc4: use simpler remove_conflicting_framebuffers(NULL)

[Michał Mirosław]

Use remove_conflicting_framebuffers(NULL) instead of open-coding it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/vc4/vc4_drv.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 94b99c90425a..96bb90325995 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -246,24 +246,6 @@ static void vc4_match_add_drivers(struct device *dev,
 	}
 }
 
-static void vc4_kick_out_firmware_fb(void)
-{
-	struct apertures_struct *ap;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	/* Since VC4 is a UMA device, the simplefb node may have been
-	 * located anywhere in memory.
-	 */
-	ap->ranges[0].base = 0;
-	ap->ranges[0].size = ~0;
-
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "vc4drmfb", false);
-	kfree(ap);
-}
-
 static int vc4_drm_bind(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -296,7 +278,7 @@ static int vc4_drm_bind(struct device *dev)
 	if (ret)
 		goto gem_destroy;
 
-	vc4_kick_out_firmware_fb();
+	drm_fb_helper_remove_conflicting_framebuffers(NULL, "vc4drmfb", false);
 
 	ret = drm_dev_register(drm, 0);
 	if (ret < 0)
-- 
2.18.0

[PATCH v2 11/12] drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)

[Michał Mirosław]

Use remove_conflicting_framebuffers(NULL) instead of duplicating it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 50d19605c38f..555b5db8036f 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -60,22 +60,6 @@ static struct drm_driver sun4i_drv_driver = {
 	/* Frame Buffer Operations */
 };
 
-static void sun4i_remove_framebuffers(void)
-{
-	struct apertures_struct *ap;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	/* The framebuffer can be located anywhere in RAM */
-	ap->ranges[0].base = 0;
-	ap->ranges[0].size = ~0;
-
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
-	kfree(ap);
-}
-
 static int sun4i_drv_bind(struct device *dev)
 {
 	struct drm_device *drm;
@@ -118,7 +102,7 @@ static int sun4i_drv_bind(struct device *dev)
 	drm->irq_enabled = true;
 
 	/* Remove early framebuffers (ie. simplefb) */
-	sun4i_remove_framebuffers();
+	drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 
 	/* Create our framebuffer */
 	ret = sun4i_framebuffer_init(drm);
-- 
2.18.0

[PATCH v2 12/12] drm/tegra: kick out simplefb

[Michał Mirosław]

Kick out firmware fb when loading Tegra driver.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/tegra/drm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 7afe2f635f74..b51ec138fed2 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1203,6 +1203,10 @@ static int host1x_drm_probe(struct host1x_device *dev)
 
 	dev_set_drvdata(&dev->dev, drm);
 
+	err = drm_fb_helper_remove_conflicting_framebuffers(NULL, "tegradrmfb", false);
+	if (err < 0)
+		goto unref;
+
 	err = drm_dev_register(drm, 0);
 	if (err < 0)
 		goto unref;
-- 
2.18.0

Re: [PATCH v2 02/12] fbdev: allow apertures == NULL in remove_conflicting_framebuffers()

[Daniel Vetter]

On Thu, Aug 30, 2018 at 11:00:05PM +0200, Michał Mirosław wrote:
> Interpret (otherwise-invalid) NULL apertures argument to mean all-memory
> range. This will allow to remove several duplicates of this code from
> drivers in following patches.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> [for v1]
> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> 
> ---
> v2: added kerneldoc to corresponding DRM helper
> ---
>  drivers/video/fbdev/core/fbmem.c | 14 ++++++++++++++
>  include/drm/drm_fb_helper.h      | 10 ++++++++++
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 30a18d4c9de4..0df148eb4699 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1779,11 +1779,25 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
>  				    const char *name, bool primary)
>  {
>  	int ret;
> +	bool do_free = false;
> +
> +	if (!a) {
> +		a = alloc_apertures(1);
> +		if (!a)
> +			return -ENOMEM;
> +
> +		a->ranges[0].base = 0;
> +		a->ranges[0].size = ~0;
> +		do_free = true;
> +	}
>  
>  	mutex_lock(&registration_lock);
>  	ret = do_remove_conflicting_framebuffers(a, name, primary);
>  	mutex_unlock(&registration_lock);
>  
> +	if (do_free)
> +		kfree(a);
> +
>  	return ret;
>  }
>  EXPORT_SYMBOL(remove_conflicting_framebuffers);
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index b069433e7fc1..1c1e53abb25d 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -566,6 +566,16 @@ static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev)
>  
>  #endif
>  
> +/**
> + * drm_fb_helper_remove_conflicting_framebuffers - remove firmware framebuffers
> + * @a: memory range, users of which are to be removed
> + * @name: requesting driver name
> + * @primary: also kick vga16fb if present
> + *
> + * This function removes framebuffer devices (eg. initialized by firmware)
> + * which use memory range described by @a. If @a is NULL all such devices are
> + * removed.
> + */

This looks like misplaced copypasta. You only need this once I think.
-Daniel

>  static inline int
>  drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
>  					      const char *name, bool primary)
> -- 
> 2.18.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v2 02/12] fbdev: allow apertures == NULL in remove_conflicting_framebuffers()

[Daniel Vetter]

On Fri, Aug 31, 2018 at 10:56:56AM +0200, Daniel Vetter wrote:
> On Thu, Aug 30, 2018 at 11:00:05PM +0200, Michał Mirosław wrote:
> > Interpret (otherwise-invalid) NULL apertures argument to mean all-memory
> > range. This will allow to remove several duplicates of this code from
> > drivers in following patches.
> > 
> > Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> > [for v1]
> > Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> > 
> > ---
> > v2: added kerneldoc to corresponding DRM helper
> > ---
> >  drivers/video/fbdev/core/fbmem.c | 14 ++++++++++++++
> >  include/drm/drm_fb_helper.h      | 10 ++++++++++
> >  2 files changed, 24 insertions(+)
> > 
> > diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> > index 30a18d4c9de4..0df148eb4699 100644
> > --- a/drivers/video/fbdev/core/fbmem.c
> > +++ b/drivers/video/fbdev/core/fbmem.c
> > @@ -1779,11 +1779,25 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
> >  				    const char *name, bool primary)
> >  {
> >  	int ret;
> > +	bool do_free = false;
> > +
> > +	if (!a) {
> > +		a = alloc_apertures(1);
> > +		if (!a)
> > +			return -ENOMEM;
> > +
> > +		a->ranges[0].base = 0;
> > +		a->ranges[0].size = ~0;
> > +		do_free = true;
> > +	}
> >  
> >  	mutex_lock(&registration_lock);
> >  	ret = do_remove_conflicting_framebuffers(a, name, primary);
> >  	mutex_unlock(&registration_lock);
> >  
> > +	if (do_free)
> > +		kfree(a);
> > +
> >  	return ret;
> >  }
> >  EXPORT_SYMBOL(remove_conflicting_framebuffers);
> > diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> > index b069433e7fc1..1c1e53abb25d 100644
> > --- a/include/drm/drm_fb_helper.h
> > +++ b/include/drm/drm_fb_helper.h
> > @@ -566,6 +566,16 @@ static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev)
> >  
> >  #endif
> >  
> > +/**
> > + * drm_fb_helper_remove_conflicting_framebuffers - remove firmware framebuffers
> > + * @a: memory range, users of which are to be removed
> > + * @name: requesting driver name
> > + * @primary: also kick vga16fb if present
> > + *
> > + * This function removes framebuffer devices (eg. initialized by firmware)
> > + * which use memory range described by @a. If @a is NULL all such devices are
> > + * removed.
> > + */
> 
> This looks like misplaced copypasta. You only need this once I think.

Ah no, just a fixup for the lack of kerneldoc we have. Can you pls split
this out into a separate patch?

Thanks, Daniel

> -Daniel
> 
> >  static inline int
> >  drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
> >  					      const char *name, bool primary)
> > -- 
> > 2.18.0
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v2 00/12] remove_conflicting_framebuffers() cleanup

[Daniel Vetter]

On Thu, Aug 30, 2018 at 11:00:01PM +0200, Michał Mirosław wrote:
> This series cleans up duplicated code for replacing firmware FB
> driver with proper DRI driver and adds handover support to
> Tegra driver.
> 
> This is a sligtly updated version of a series sent on 24 Nov 2017.
> 
> v2:
>  - rebased on current drm-next
>  - dropped staging/sm750fb changes
>  - added kernel docs for DRM helpers
> 
> Michał Mirosław (12):
>   fbdev: show fbdev number for debugging
>   fbdev: allow apertures = NULL in remove_conflicting_framebuffers()
>   fbdev: add remove_conflicting_pci_framebuffers()
>   drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
>   drm/bochs: use simpler remove_conflicting_pci_framebuffers()
>   drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
>   drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
>   drm/radeon: use simpler remove_conflicting_pci_framebuffers()
>   drm/virtio: use simpler remove_conflicting_pci_framebuffers()
>   drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
>   drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
>   drm/tegra: kick out simplefb

Looks very neat. A bit confused about the drm changes in the fbdev-titled
patches 1&3, but I guess we can merge as-is. Up to you whether you want to
split or not I'd say.

Bartlomiej, ack for pullin in this entire pile through drm-misc?

Thanks, Daniel

> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 +-------------
>  drivers/gpu/drm/bochs/bochs_drv.c        | 18 +----------
>  drivers/gpu/drm/cirrus/cirrus_drv.c      | 23 +-------------
>  drivers/gpu/drm/mgag200/mgag200_drv.c    | 21 +------------
>  drivers/gpu/drm/mgag200/mgag200_main.c   |  9 ------
>  drivers/gpu/drm/radeon/radeon_drv.c      | 23 +-------------
>  drivers/gpu/drm/sun4i/sun4i_drv.c        | 18 +----------
>  drivers/gpu/drm/tegra/drm.c              |  4 +++
>  drivers/gpu/drm/vc4/vc4_drv.c            | 20 +-----------
>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 ++------------
>  drivers/video/fbdev/core/fbmem.c         | 40 ++++++++++++++++++++++--
>  include/drm/drm_fb_helper.h              | 34 ++++++++++++++++++++
>  include/linux/fb.h                       |  2 ++
>  13 files changed, 88 insertions(+), 172 deletions(-)
> 
> -- 
> 2.18.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v2 00/12] remove_conflicting_framebuffers() cleanup

[Chris Wilson]

Quoting Daniel Vetter (2018-08-31 10:04:39)
> On Thu, Aug 30, 2018 at 11:00:01PM +0200, Michał Mirosław wrote:
> > This series cleans up duplicated code for replacing firmware FB
> > driver with proper DRI driver and adds handover support to
> > Tegra driver.
> > 
> > This is a sligtly updated version of a series sent on 24 Nov 2017.
> > 
> > v2:
> >  - rebased on current drm-next
> >  - dropped staging/sm750fb changes
> >  - added kernel docs for DRM helpers
> > 
> > Michał Mirosław (12):
> >   fbdev: show fbdev number for debugging
> >   fbdev: allow apertures = NULL in remove_conflicting_framebuffers()
> >   fbdev: add remove_conflicting_pci_framebuffers()
> >   drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
> >   drm/bochs: use simpler remove_conflicting_pci_framebuffers()
> >   drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
> >   drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
> >   drm/radeon: use simpler remove_conflicting_pci_framebuffers()
> >   drm/virtio: use simpler remove_conflicting_pci_framebuffers()
> >   drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
> >   drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
> >   drm/tegra: kick out simplefb
> 
> Looks very neat. A bit confused about the drm changes in the fbdev-titled
> patches 1&3, but I guess we can merge as-is. Up to you whether you want to
> split or not I'd say.

Ahah, someone is looking at remove_conflicting_framebuffers(). May I
interest you in a use-after-free?

[  378.423513] stack segment: 0000 [#1] PREEMPT SMP PTI
[  378.423530] CPU: 1 PID: 4338 Comm: pm_rpm Tainted: G     U            4.19.0-rc1-CI-CI_DRM_4746+ #1
[  378.423548] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J4205-ITX, BIOS P1.10 09/29/2016
[  378.423570] RIP: 0010:do_remove_conflicting_framebuffers+0x56/0x170
[  378.423587] Code: 49 8b 45 00 48 85 c0 74 50 f6 40 0a 08 74 4a 4d 85 e4 48 8b a8 78 04 00 00 74 1f 48 85 ed 74 1a 41 8b 0c 24 31 db 85 c9 74 10 <8b> 55 00 85 d2 75 42 83 c3 01 41 39 1c 24 77 f0 48 85 ed 74 1a 45
[  378.423620] RSP: 0018:ffffc900001dfa88 EFLAGS: 00010202
[  378.423632] RAX: ffff880274470008 RBX: 0000000000000000 RCX: 0000000000000001
[  378.423646] RDX: 0000000000000001 RSI: ffffffffa025c634 RDI: ffff88025cc3b428
[  378.423660] RBP: 6b6b6b6b6b6b6b6b R08: 000000001edaddfa R09: ffffffffa025c634
[  378.423673] R10: ffffc900001dfae8 R11: ffffffff820de938 R12: ffff88025cc3b428
[  378.423687] R13: ffffffff8234ca20 R14: ffffffff8234cb20 R15: 0000000000000001
[  378.423701] FS:  00007fcf03d0a980(0000) GS:ffff880277e80000(0000) knlGS:0000000000000000
[  378.423717] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  378.423729] CR2: 00007fffece1fdb8 CR3: 00000001fe32e000 CR4: 00000000003406e0
[  378.423742] Call Trace:
[  378.423756]  remove_conflicting_framebuffers+0x28/0x40
[  378.423856]  i915_driver_load+0x7f5/0x10c0 [i915]
[  378.423873]  ? _raw_spin_unlock_irqrestore+0x4c/0x60
[  378.423887]  ? lockdep_hardirqs_on+0xe0/0x1b0
[  378.423962]  i915_pci_probe+0x29/0xa0 [i915]
[  378.423977]  pci_device_probe+0xa1/0x130
[  378.423990]  really_probe+0x25d/0x3c0
[  378.424002]  driver_probe_device+0x10a/0x120
[  378.424013]  __driver_attach+0xdb/0x100
[  378.424025]  ? driver_probe_device+0x120/0x120
[  378.424037]  bus_for_each_dev+0x74/0xc0
[  378.424048]  bus_add_driver+0x15f/0x250
[  378.424060]  ? 0xffffffffa069d000
[  378.424070]  driver_register+0x56/0xe0
[  378.424080]  ? 0xffffffffa069d000
[  378.424090]  do_one_initcall+0x58/0x2e0
[  378.424101]  ? rcu_lockdep_current_cpu_online+0x8f/0xd0
[  378.424116]  ? do_init_module+0x1d/0x1ea
[  378.424127]  ? rcu_read_lock_sched_held+0x6f/0x80
[  378.424141]  ? kmem_cache_alloc_trace+0x264/0x290
[  378.424154]  do_init_module+0x56/0x1ea
[  378.424167]  load_module+0x26ba/0x29a0
[  378.424182]  ? vfs_read+0x122/0x140
[  378.424199]  ? __se_sys_finit_module+0xd3/0xf0
[  378.424210]  __se_sys_finit_module+0xd3/0xf0
[  378.424226]  do_syscall_64+0x55/0x190
[  378.424237]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  378.424249] RIP: 0033:0x7fcf02f9b839
[  378.424258] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1f f6 2c 00 f7 d8 64 89 01 48
[  378.424290] RSP: 002b:00007fffece21f58 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  378.424307] RAX: ffffffffffffffda RBX: 000056344e1a4d80 RCX: 00007fcf02f9b839
[  378.424321] RDX: 0000000000000000 RSI: 00007fcf026470e5 RDI: 0000000000000003
[  378.424336] RBP: 00007fcf026470e5 R08: 0000000000000000 R09: 0000000000000000
[  378.424349] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[  378.424363] R13: 000056344e1a0000 R14: 0000000000000000 R15: 000056344e1a4d80

https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4613/fi-bxt-j4205/dmesg0.log
-Chris

Re: [PATCH v2 00/12] remove_conflicting_framebuffers() cleanup

[Michał Mirosław]

On Fri, Aug 31, 2018 at 10:07:42AM +0100, Chris Wilson wrote:
[...]
> Ahah, someone is looking at remove_conflicting_framebuffers(). May I
> interest you in a use-after-free?

> [  378.423513] stack segment: 0000 [#1] PREEMPT SMP PTI
> [  378.423530] CPU: 1 PID: 4338 Comm: pm_rpm Tainted: G     U            4.19.0-rc1-CI-CI_DRM_4746+ #1
> [  378.423548] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J4205-ITX, BIOS P1.10 09/29/2016
> [  378.423570] RIP: 0010:do_remove_conflicting_framebuffers+0x56/0x170
> [  378.423587] Code: 49 8b 45 00 48 85 c0 74 50 f6 40 0a 08 74 4a 4d 85 e4 48 8b a8 78 04 00 00 74 1f 48 85 ed 74 1a 41 8b 0c 24 31 db 85 c9 74 10 <8b> 55 00 85 d2 75 42 83 c3 01 41 39 1c 24 77 f0 48 85 ed 74 1a 45
> [  378.423620] RSP: 0018:ffffc900001dfa88 EFLAGS: 00010202
> [  378.423632] RAX: ffff880274470008 RBX: 0000000000000000 RCX: 0000000000000001
> [  378.423646] RDX: 0000000000000001 RSI: ffffffffa025c634 RDI: ffff88025cc3b428
> [  378.423660] RBP: 6b6b6b6b6b6b6b6b R08: 000000001edaddfa R09: ffffffffa025c634
> [  378.423673] R10: ffffc900001dfae8 R11: ffffffff820de938 R12: ffff88025cc3b428
> [  378.423687] R13: ffffffff8234ca20 R14: ffffffff8234cb20 R15: 0000000000000001
> [  378.423701] FS:  00007fcf03d0a980(0000) GS:ffff880277e80000(0000) knlGS:0000000000000000
> [  378.423717] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  378.423729] CR2: 00007fffece1fdb8 CR3: 00000001fe32e000 CR4: 00000000003406e0
> [  378.423742] Call Trace:
> [  378.423756]  remove_conflicting_framebuffers+0x28/0x40
> [  378.423856]  i915_driver_load+0x7f5/0x10c0 [i915]
[...]

Looks like registered_fb[] entry is pointing to (partially?) freed or
corrupted fb_info, but I can't see how this could be an effect of
remove_conflicting_framebuffers().

Best Regards,
Micha³ Miros³aw

[PATCH v3 00/13] remove_conflicting_framebuffers() cleanup

[Michał Mirosław]

This series cleans up duplicated code for replacing firmware FB
driver with proper DRI driver and adds handover support to
Tegra driver.

This is a sligtly updated version of a series sent on 24 Nov 2017.

---
v2:
 - rebased on current drm-next
 - dropped staging/sm750fb changes
 - added kernel docs for DRM helpers
v3:
 - move kerneldoc to fbdev, where functions are implemented
 - split kerneldoc for remove_conflicting_framebuffers()
 - propagate return value in remove_conflicting_pci_framebuffers()

---
Michał Mirosław (13):
  fbdev: show fbdev number for debugging
  fbdev: allow apertures = NULL in remove_conflicting_framebuffers()
  fbdev: add kerneldoc do remove_conflicting_framebuffers()
  fbdev: add remove_conflicting_pci_framebuffers()
  drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
  drm/bochs: use simpler remove_conflicting_pci_framebuffers()
  drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
  drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
  drm/radeon: use simpler remove_conflicting_pci_framebuffers()
  drm/virtio: use simpler remove_conflicting_pci_framebuffers()
  drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
  drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
  drm/tegra: kick out simplefb

 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 +--------
 drivers/gpu/drm/bochs/bochs_drv.c        | 18 +------
 drivers/gpu/drm/cirrus/cirrus_drv.c      | 23 +--------
 drivers/gpu/drm/mgag200/mgag200_drv.c    | 21 +-------
 drivers/gpu/drm/mgag200/mgag200_main.c   |  9 ----
 drivers/gpu/drm/radeon/radeon_drv.c      | 23 +--------
 drivers/gpu/drm/sun4i/sun4i_drv.c        | 18 +------
 drivers/gpu/drm/tegra/drm.c              |  4 ++
 drivers/gpu/drm/vc4/vc4_drv.c            | 20 +-------
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 ++-------
 drivers/video/fbdev/core/fbmem.c         | 63 +++++++++++++++++++++++-
 include/drm/drm_fb_helper.h              | 12 +++++
 include/linux/fb.h                       |  2 +
 13 files changed, 89 insertions(+), 172 deletions(-)

-- 
2.18.0

[PATCH v3 02/13] fbdev: allow apertures == NULL in remove_conflicting_framebuffers()

[Michał Mirosław]

Interpret (otherwise-invalid) NULL apertures argument to mean all-memory
range. This will allow to remove several duplicates of this code
from drivers in following patches.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

---
v2: added kerneldoc to corresponding DRM helper
v3: split kerneldoc to another patch
---
 drivers/video/fbdev/core/fbmem.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 30a18d4c9de4..0df148eb4699 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1779,11 +1779,25 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 				    const char *name, bool primary)
 {
 	int ret;
+	bool do_free = false;
+
+	if (!a) {
+		a = alloc_apertures(1);
+		if (!a)
+			return -ENOMEM;
+
+		a->ranges[0].base = 0;
+		a->ranges[0].size = ~0;
+		do_free = true;
+	}
 
 	mutex_lock(&registration_lock);
 	ret = do_remove_conflicting_framebuffers(a, name, primary);
 	mutex_unlock(&registration_lock);
 
+	if (do_free)
+		kfree(a);
+
 	return ret;
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
-- 
2.18.0

[PATCH v3 01/13] fbdev: show fbdev number for debugging

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/video/fbdev/core/fbmem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index f741ba8df01b..30a18d4c9de4 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1618,8 +1618,8 @@ static int do_remove_conflicting_framebuffers(struct apertures_struct *a,
 			(primary && gen_aper && gen_aper->count &&
 			 gen_aper->ranges[0].base = VGA_FB_PHYS)) {
 
-			printk(KERN_INFO "fb: switching to %s from %s\n",
-			       name, registered_fb[i]->fix.id);
+			printk(KERN_INFO "fb%d: switching to %s from %s\n",
+			       i, name, registered_fb[i]->fix.id);
 			ret = do_unregister_framebuffer(registered_fb[i]);
 			if (ret)
 				return ret;
-- 
2.18.0

[PATCH v3 04/13] fbdev: add remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Almost all PCI drivers using remove_conflicting_framebuffers() wrap it
with the same code.

---
v2: add kerneldoc for DRM helper
v3: propagate remove_conflicting_framebuffers() return value
  + move kerneldoc to where function is implemented

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/video/fbdev/core/fbmem.c | 35 ++++++++++++++++++++++++++++++++
 include/drm/drm_fb_helper.h      | 12 +++++++++++
 include/linux/fb.h               |  2 ++
 3 files changed, 49 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 2de93b5014e3..cd96b1c62bbe 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -34,6 +34,7 @@
 #include <linux/fb.h>
 #include <linux/fbcon.h>
 #include <linux/mem_encrypt.h>
+#include <linux/pci.h>
 
 #include <asm/fb.h>
 
@@ -1812,6 +1813,40 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
 
+/**
+ * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
+ * @pdev: PCI device
+ * @resource_id: index of PCI BAR configuring framebuffer memory
+ * @name: requesting driver name
+ *
+ * This function removes framebuffer devices (eg. initialized by firmware)
+ * using memory range configured for @pdev's BAR @resource_id.
+ *
+ * The function assumes that PCI device with shadowed ROM drives a primary
+ * display and so kicks out vga16fb.
+ */
+int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
+{
+	struct apertures_struct *ap;
+	bool primary = false;
+	int err;
+
+	ap = alloc_apertures(1);
+	if (!ap)
+		return -ENOMEM;
+
+	ap->ranges[0].base = pci_resource_start(pdev, res_id);
+	ap->ranges[0].size = pci_resource_len(pdev, res_id);
+#ifdef CONFIG_X86
+	primary = pdev->resource[PCI_ROM_RESOURCE].flags &
+					IORESOURCE_ROM_SHADOW;
+#endif
+	err = remove_conflicting_framebuffers(ap, name, primary);
+	kfree(ap);
+	return err;
+}
+EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
+
 /**
  *	register_framebuffer - registers a frame buffer device
  *	@fb_info: frame buffer info structure
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index b069433e7fc1..20ea856db900 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -577,4 +577,16 @@ drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
 #endif
 }
 
+static inline int
+drm_fb_helper_remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
+						  int resource_id,
+						  const char *name)
+{
+#if IS_REACHABLE(CONFIG_FB)
+	return remove_conflicting_pci_framebuffers(pdev, resource_id, name);
+#else
+	return 0;
+#endif
+}
+
 #endif
diff --git a/include/linux/fb.h b/include/linux/fb.h
index aa74a228bb92..abeffd55b66a 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -632,6 +632,8 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
 extern int register_framebuffer(struct fb_info *fb_info);
 extern int unregister_framebuffer(struct fb_info *fb_info);
 extern int unlink_framebuffer(struct fb_info *fb_info);
+extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id,
+					       const char *name);
 extern int remove_conflicting_framebuffers(struct apertures_struct *a,
 					   const char *name, bool primary);
 extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
-- 
2.18.0

[PATCH v3 03/13] fbdev: add kerneldoc do remove_conflicting_framebuffers()

[Michał Mirosław]

Document remove_conflicting_framebuffers() behaviour.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/video/fbdev/core/fbmem.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 0df148eb4699..2de93b5014e3 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1775,6 +1775,16 @@ int unlink_framebuffer(struct fb_info *fb_info)
 }
 EXPORT_SYMBOL(unlink_framebuffer);
 
+/**
+ * remove_conflicting_framebuffers - remove firmware-configured framebuffers
+ * @a: memory range, users of which are to be removed
+ * @name: requesting driver name
+ * @primary: also kick vga16fb if present
+ *
+ * This function removes framebuffer devices (initialized by firmware/bootloader)
+ * which use memory range described by @a. If @a is NULL all such devices are
+ * removed.
+ */
 int remove_conflicting_framebuffers(struct apertures_struct *a,
 				    const char *name, bool primary)
 {
-- 
2.18.0

[PATCH v3 06/13] drm/bochs: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/bochs/bochs_drv.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index 7b20318483e4..c61b40c72b62 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -143,22 +143,6 @@ static const struct dev_pm_ops bochs_pm_ops = {
 /* ---------------------------------------------------------------------- */
 /* pci interface                                                          */
 
-static int bochs_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "bochsdrmfb", false);
-	kfree(ap);
-
-	return 0;
-}
-
 static int bochs_pci_probe(struct pci_dev *pdev,
 			   const struct pci_device_id *ent)
 {
@@ -171,7 +155,7 @@ static int bochs_pci_probe(struct pci_dev *pdev,
 		return -ENOMEM;
 	}
 
-	ret = bochs_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "bochsdrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v3 05/13] drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 24 +-----------------------
 1 file changed, 1 insertion(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 0b19482b36b8..9b6e037719db 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -560,28 +560,6 @@ MODULE_DEVICE_TABLE(pci, pciidlist);
 
 static struct drm_driver kms_driver;
 
-static int amdgpu_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "amdgpudrmfb", primary);
-	kfree(ap);
-
-	return 0;
-}
-
-
 static int amdgpu_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
@@ -609,7 +587,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 		return ret;
 
 	/* Get rid of things like offb */
-	ret = amdgpu_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "amdgpudrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v3 07/13] drm/cirrus: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/cirrus/cirrus_drv.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.c b/drivers/gpu/drm/cirrus/cirrus_drv.c
index 69c4e352dd78..85ed8657c862 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.c
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.c
@@ -42,33 +42,12 @@ static const struct pci_device_id pciidlist[] = {
 };
 
 
-static int cirrus_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "cirrusdrmfb", primary);
-	kfree(ap);
-
-	return 0;
-}
-
 static int cirrus_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
 	int ret;
 
-	ret = cirrus_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "cirrusdrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v3 09/13] drm/radeon: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/radeon/radeon_drv.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index b28288a781ef..36c98a0ec991 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -311,27 +311,6 @@ static struct drm_driver kms_driver;
 
 bool radeon_device_is_virtual(void);
 
-static int radeon_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return -ENOMEM;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "radeondrmfb", primary);
-	kfree(ap);
-
-	return 0;
-}
-
 static int radeon_pci_probe(struct pci_dev *pdev,
 			    const struct pci_device_id *ent)
 {
@@ -341,7 +320,7 @@ static int radeon_pci_probe(struct pci_dev *pdev,
 		return -EPROBE_DEFER;
 
 	/* Get rid of things like offb */
-	ret = radeon_kick_out_firmware_fb(pdev);
+	ret = drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "radeondrmfb");
 	if (ret)
 		return ret;
 
-- 
2.18.0

[PATCH v3 08/13] drm/mgag200: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Remove duplicated call, while at it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/mgag200/mgag200_drv.c  | 21 +--------------------
 drivers/gpu/drm/mgag200/mgag200_main.c |  9 ---------
 2 files changed, 1 insertion(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
index 74cdde2ee474..ac6af4bd9df6 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.c
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
@@ -42,29 +42,10 @@ static const struct pci_device_id pciidlist[] = {
 
 MODULE_DEVICE_TABLE(pci, pciidlist);
 
-static void mgag200_kick_out_firmware_fb(struct pci_dev *pdev)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	ap->ranges[0].base = pci_resource_start(pdev, 0);
-	ap->ranges[0].size = pci_resource_len(pdev, 0);
-
-#ifdef CONFIG_X86
-	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
-#endif
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "mgag200drmfb", primary);
-	kfree(ap);
-}
-
 
 static int mga_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	mgag200_kick_out_firmware_fb(pdev);
+	drm_fb_helper_remove_conflicting_pci_framebuffers(pdev, 0, "mgag200drmfb");
 
 	return drm_get_pci_dev(pdev, ent, &driver);
 }
diff --git a/drivers/gpu/drm/mgag200/mgag200_main.c b/drivers/gpu/drm/mgag200/mgag200_main.c
index 780f983b0294..79d54103d470 100644
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -124,20 +124,11 @@ static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 static int mga_vram_init(struct mga_device *mdev)
 {
 	void __iomem *mem;
-	struct apertures_struct *aper = alloc_apertures(1);
-	if (!aper)
-		return -ENOMEM;
 
 	/* BAR 0 is VRAM */
 	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
 	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
 
-	aper->ranges[0].base = mdev->mc.vram_base;
-	aper->ranges[0].size = mdev->mc.vram_window;
-
-	drm_fb_helper_remove_conflicting_framebuffers(aper, "mgafb", true);
-	kfree(aper);
-
 	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
 				"mgadrmfb_vram")) {
 		DRM_ERROR("can't reserve VRAM\n");
-- 
2.18.0

[PATCH v3 10/13] drm/virtio: use simpler remove_conflicting_pci_framebuffers()

[Michał Mirosław]

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
index 7df8d0c9026a..115ed546ca4e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
@@ -28,26 +28,6 @@
 
 #include "virtgpu_drv.h"
 
-static void virtio_pci_kick_out_firmware_fb(struct pci_dev *pci_dev)
-{
-	struct apertures_struct *ap;
-	bool primary;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	ap->ranges[0].base = pci_resource_start(pci_dev, 0);
-	ap->ranges[0].size = pci_resource_len(pci_dev, 0);
-
-	primary = pci_dev->resource[PCI_ROM_RESOURCE].flags
-		& IORESOURCE_ROM_SHADOW;
-
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "virtiodrmfb", primary);
-
-	kfree(ap);
-}
-
 int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 {
 	struct drm_device *dev;
@@ -69,7 +49,9 @@ int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
 			 pname);
 		dev->pdev = pdev;
 		if (vga)
-			virtio_pci_kick_out_firmware_fb(pdev);
+			drm_fb_helper_remove_conflicting_pci_framebuffers(pdev,
+									  0,
+									  "virtiodrmfb");
 
 		snprintf(unique, sizeof(unique), "pci:%s", pname);
 		ret = drm_dev_set_unique(dev, unique);
-- 
2.18.0

[PATCH v3 11/13] drm/vc4: use simpler remove_conflicting_framebuffers(NULL)

[Michał Mirosław]

Use remove_conflicting_framebuffers(NULL) instead of open-coding it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/vc4/vc4_drv.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
index 94b99c90425a..96bb90325995 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -246,24 +246,6 @@ static void vc4_match_add_drivers(struct device *dev,
 	}
 }
 
-static void vc4_kick_out_firmware_fb(void)
-{
-	struct apertures_struct *ap;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	/* Since VC4 is a UMA device, the simplefb node may have been
-	 * located anywhere in memory.
-	 */
-	ap->ranges[0].base = 0;
-	ap->ranges[0].size = ~0;
-
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "vc4drmfb", false);
-	kfree(ap);
-}
-
 static int vc4_drm_bind(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -296,7 +278,7 @@ static int vc4_drm_bind(struct device *dev)
 	if (ret)
 		goto gem_destroy;
 
-	vc4_kick_out_firmware_fb();
+	drm_fb_helper_remove_conflicting_framebuffers(NULL, "vc4drmfb", false);
 
 	ret = drm_dev_register(drm, 0);
 	if (ret < 0)
-- 
2.18.0

[PATCH v3 12/13] drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)

[Michał Mirosław]

Use remove_conflicting_framebuffers(NULL) instead of duplicating it.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 50d19605c38f..555b5db8036f 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -60,22 +60,6 @@ static struct drm_driver sun4i_drv_driver = {
 	/* Frame Buffer Operations */
 };
 
-static void sun4i_remove_framebuffers(void)
-{
-	struct apertures_struct *ap;
-
-	ap = alloc_apertures(1);
-	if (!ap)
-		return;
-
-	/* The framebuffer can be located anywhere in RAM */
-	ap->ranges[0].base = 0;
-	ap->ranges[0].size = ~0;
-
-	drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
-	kfree(ap);
-}
-
 static int sun4i_drv_bind(struct device *dev)
 {
 	struct drm_device *drm;
@@ -118,7 +102,7 @@ static int sun4i_drv_bind(struct device *dev)
 	drm->irq_enabled = true;
 
 	/* Remove early framebuffers (ie. simplefb) */
-	sun4i_remove_framebuffers();
+	drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
 
 	/* Create our framebuffer */
 	ret = sun4i_framebuffer_init(drm);
-- 
2.18.0

[PATCH v3 13/13] drm/tegra: kick out simplefb

[Michał Mirosław]

Kick out firmware fb when loading Tegra driver.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/tegra/drm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 7afe2f635f74..b51ec138fed2 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1203,6 +1203,10 @@ static int host1x_drm_probe(struct host1x_device *dev)
 
 	dev_set_drvdata(&dev->dev, drm);
 
+	err = drm_fb_helper_remove_conflicting_framebuffers(NULL, "tegradrmfb", false);
+	if (err < 0)
+		goto unref;
+
 	err = drm_dev_register(drm, 0);
 	if (err < 0)
 		goto unref;
-- 
2.18.0

Re: [PATCH v3 00/13] remove_conflicting_framebuffers() cleanup

[Daniel Vetter]

On Sat, Sep 01, 2018 at 04:08:41PM +0200, Michał Mirosław wrote:
> This series cleans up duplicated code for replacing firmware FB
> driver with proper DRI driver and adds handover support to
> Tegra driver.
> 
> This is a sligtly updated version of a series sent on 24 Nov 2017.
> 
> ---
> v2:
>  - rebased on current drm-next
>  - dropped staging/sm750fb changes
>  - added kernel docs for DRM helpers
> v3:
>  - move kerneldoc to fbdev, where functions are implemented
>  - split kerneldoc for remove_conflicting_framebuffers()

Ah, that's not quite what I had in mind. I think having the docs (also) in
the drm helpers would be good, since that's where drm people will look,
and that's the function they'll call. I just wanted you to split the fbdev
and drm parts into 2 patches (since those are two different maintainers).

Anyway, this is ok too, so imo ready for merging. If you can resurrect the
drm docs (with a patch title of "drm/fb-helper: document fbdev remove
functions" or similar) that would be great.

Only thing we need for merging now is the ack from Bartlomiej.
-Daniel

>  - propagate return value in remove_conflicting_pci_framebuffers()
> 
> ---
> Michał Mirosław (13):
>   fbdev: show fbdev number for debugging
>   fbdev: allow apertures = NULL in remove_conflicting_framebuffers()
>   fbdev: add kerneldoc do remove_conflicting_framebuffers()
>   fbdev: add remove_conflicting_pci_framebuffers()
>   drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
>   drm/bochs: use simpler remove_conflicting_pci_framebuffers()
>   drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
>   drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
>   drm/radeon: use simpler remove_conflicting_pci_framebuffers()
>   drm/virtio: use simpler remove_conflicting_pci_framebuffers()
>   drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
>   drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
>   drm/tegra: kick out simplefb
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 +--------
>  drivers/gpu/drm/bochs/bochs_drv.c        | 18 +------
>  drivers/gpu/drm/cirrus/cirrus_drv.c      | 23 +--------
>  drivers/gpu/drm/mgag200/mgag200_drv.c    | 21 +-------
>  drivers/gpu/drm/mgag200/mgag200_main.c   |  9 ----
>  drivers/gpu/drm/radeon/radeon_drv.c      | 23 +--------
>  drivers/gpu/drm/sun4i/sun4i_drv.c        | 18 +------
>  drivers/gpu/drm/tegra/drm.c              |  4 ++
>  drivers/gpu/drm/vc4/vc4_drv.c            | 20 +-------
>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 ++-------
>  drivers/video/fbdev/core/fbmem.c         | 63 +++++++++++++++++++++++-
>  include/drm/drm_fb_helper.h              | 12 +++++
>  include/linux/fb.h                       |  2 +
>  13 files changed, 89 insertions(+), 172 deletions(-)
> 
> -- 
> 2.18.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v3 00/13] remove_conflicting_framebuffers() cleanup

[Bartlomiej Zolnierkiewicz]

On Monday, September 03, 2018 09:43:15 AM Daniel Vetter wrote:
> On Sat, Sep 01, 2018 at 04:08:41PM +0200, Michał Mirosław wrote:
> > This series cleans up duplicated code for replacing firmware FB
> > driver with proper DRI driver and adds handover support to
> > Tegra driver.
> > 
> > This is a sligtly updated version of a series sent on 24 Nov 2017.
> > 
> > ---
> > v2:
> >  - rebased on current drm-next
> >  - dropped staging/sm750fb changes
> >  - added kernel docs for DRM helpers
> > v3:
> >  - move kerneldoc to fbdev, where functions are implemented
> >  - split kerneldoc for remove_conflicting_framebuffers()
> 
> Ah, that's not quite what I had in mind. I think having the docs (also) in
> the drm helpers would be good, since that's where drm people will look,
> and that's the function they'll call. I just wanted you to split the fbdev
> and drm parts into 2 patches (since those are two different maintainers).
> 
> Anyway, this is ok too, so imo ready for merging. If you can resurrect the
> drm docs (with a patch title of "drm/fb-helper: document fbdev remove
> functions" or similar) that would be great.
> 
> Only thing we need for merging now is the ack from Bartlomiej.

For the whole patchset:

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

> -Daniel
> 
> >  - propagate return value in remove_conflicting_pci_framebuffers()
> > 
> > ---
> > Michał Mirosław (13):
> >   fbdev: show fbdev number for debugging
> >   fbdev: allow apertures == NULL in remove_conflicting_framebuffers()
> >   fbdev: add kerneldoc do remove_conflicting_framebuffers()
> >   fbdev: add remove_conflicting_pci_framebuffers()
> >   drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
> >   drm/bochs: use simpler remove_conflicting_pci_framebuffers()
> >   drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
> >   drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
> >   drm/radeon: use simpler remove_conflicting_pci_framebuffers()
> >   drm/virtio: use simpler remove_conflicting_pci_framebuffers()
> >   drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
> >   drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
> >   drm/tegra: kick out simplefb
> > 
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 +--------
> >  drivers/gpu/drm/bochs/bochs_drv.c        | 18 +------
> >  drivers/gpu/drm/cirrus/cirrus_drv.c      | 23 +--------
> >  drivers/gpu/drm/mgag200/mgag200_drv.c    | 21 +-------
> >  drivers/gpu/drm/mgag200/mgag200_main.c   |  9 ----
> >  drivers/gpu/drm/radeon/radeon_drv.c      | 23 +--------
> >  drivers/gpu/drm/sun4i/sun4i_drv.c        | 18 +------
> >  drivers/gpu/drm/tegra/drm.c              |  4 ++
> >  drivers/gpu/drm/vc4/vc4_drv.c            | 20 +-------
> >  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 ++-------
> >  drivers/video/fbdev/core/fbmem.c         | 63 +++++++++++++++++++++++-
> >  include/drm/drm_fb_helper.h              | 12 +++++
> >  include/linux/fb.h                       |  2 +
> >  13 files changed, 89 insertions(+), 172 deletions(-)

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

Re: [PATCH v3 04/13] fbdev: add remove_conflicting_pci_framebuffers()

[Daniel Vetter]

On Sat, Sep 01, 2018 at 04:08:45PM +0200, Michał Mirosław wrote:
> Almost all PCI drivers using remove_conflicting_framebuffers() wrap it
> with the same code.
> 
> ---

This cuts away the sob. Just fyi.
-Daniel

> v2: add kerneldoc for DRM helper
> v3: propagate remove_conflicting_framebuffers() return value
>   + move kerneldoc to where function is implemented
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
>  drivers/video/fbdev/core/fbmem.c | 35 ++++++++++++++++++++++++++++++++
>  include/drm/drm_fb_helper.h      | 12 +++++++++++
>  include/linux/fb.h               |  2 ++
>  3 files changed, 49 insertions(+)
> 
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 2de93b5014e3..cd96b1c62bbe 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -34,6 +34,7 @@
>  #include <linux/fb.h>
>  #include <linux/fbcon.h>
>  #include <linux/mem_encrypt.h>
> +#include <linux/pci.h>
>  
>  #include <asm/fb.h>
>  
> @@ -1812,6 +1813,40 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
>  }
>  EXPORT_SYMBOL(remove_conflicting_framebuffers);
>  
> +/**
> + * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
> + * @pdev: PCI device
> + * @resource_id: index of PCI BAR configuring framebuffer memory
> + * @name: requesting driver name
> + *
> + * This function removes framebuffer devices (eg. initialized by firmware)
> + * using memory range configured for @pdev's BAR @resource_id.
> + *
> + * The function assumes that PCI device with shadowed ROM drives a primary
> + * display and so kicks out vga16fb.
> + */
> +int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
> +{
> +	struct apertures_struct *ap;
> +	bool primary = false;
> +	int err;
> +
> +	ap = alloc_apertures(1);
> +	if (!ap)
> +		return -ENOMEM;
> +
> +	ap->ranges[0].base = pci_resource_start(pdev, res_id);
> +	ap->ranges[0].size = pci_resource_len(pdev, res_id);
> +#ifdef CONFIG_X86
> +	primary = pdev->resource[PCI_ROM_RESOURCE].flags &
> +					IORESOURCE_ROM_SHADOW;
> +#endif
> +	err = remove_conflicting_framebuffers(ap, name, primary);
> +	kfree(ap);
> +	return err;
> +}
> +EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
> +
>  /**
>   *	register_framebuffer - registers a frame buffer device
>   *	@fb_info: frame buffer info structure
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index b069433e7fc1..20ea856db900 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -577,4 +577,16 @@ drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
>  #endif
>  }
>  
> +static inline int
> +drm_fb_helper_remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
> +						  int resource_id,
> +						  const char *name)
> +{
> +#if IS_REACHABLE(CONFIG_FB)
> +	return remove_conflicting_pci_framebuffers(pdev, resource_id, name);
> +#else
> +	return 0;
> +#endif
> +}
> +
>  #endif
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index aa74a228bb92..abeffd55b66a 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -632,6 +632,8 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
>  extern int register_framebuffer(struct fb_info *fb_info);
>  extern int unregister_framebuffer(struct fb_info *fb_info);
>  extern int unlink_framebuffer(struct fb_info *fb_info);
> +extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id,
> +					       const char *name);
>  extern int remove_conflicting_framebuffers(struct apertures_struct *a,
>  					   const char *name, bool primary);
>  extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
> -- 
> 2.18.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v3 00/13] remove_conflicting_framebuffers() cleanup

[Daniel Vetter]

On Mon, Sep 03, 2018 at 01:31:34PM +0200, Bartlomiej Zolnierkiewicz wrote:
> On Monday, September 03, 2018 09:43:15 AM Daniel Vetter wrote:
> > On Sat, Sep 01, 2018 at 04:08:41PM +0200, Michał Mirosław wrote:
> > > This series cleans up duplicated code for replacing firmware FB
> > > driver with proper DRI driver and adds handover support to
> > > Tegra driver.
> > > 
> > > This is a sligtly updated version of a series sent on 24 Nov 2017.
> > > 
> > > ---
> > > v2:
> > >  - rebased on current drm-next
> > >  - dropped staging/sm750fb changes
> > >  - added kernel docs for DRM helpers
> > > v3:
> > >  - move kerneldoc to fbdev, where functions are implemented
> > >  - split kerneldoc for remove_conflicting_framebuffers()
> > 
> > Ah, that's not quite what I had in mind. I think having the docs (also) in
> > the drm helpers would be good, since that's where drm people will look,
> > and that's the function they'll call. I just wanted you to split the fbdev
> > and drm parts into 2 patches (since those are two different maintainers).
> > 
> > Anyway, this is ok too, so imo ready for merging. If you can resurrect the
> > drm docs (with a patch title of "drm/fb-helper: document fbdev remove
> > functions" or similar) that would be great.
> > 
> > Only thing we need for merging now is the ack from Bartlomiej.
> 
> For the whole patchset:
> 
> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Thanks, entire patch set applied to drm-misc-next for 4.20.
-Daniel

> 
> > -Daniel
> > 
> > >  - propagate return value in remove_conflicting_pci_framebuffers()
> > > 
> > > ---
> > > Michał Mirosław (13):
> > >   fbdev: show fbdev number for debugging
> > >   fbdev: allow apertures = NULL in remove_conflicting_framebuffers()
> > >   fbdev: add kerneldoc do remove_conflicting_framebuffers()
> > >   fbdev: add remove_conflicting_pci_framebuffers()
> > >   drm/amdgpu: use simpler remove_conflicting_pci_framebuffers()
> > >   drm/bochs: use simpler remove_conflicting_pci_framebuffers()
> > >   drm/cirrus: use simpler remove_conflicting_pci_framebuffers()
> > >   drm/mgag200: use simpler remove_conflicting_pci_framebuffers()
> > >   drm/radeon: use simpler remove_conflicting_pci_framebuffers()
> > >   drm/virtio: use simpler remove_conflicting_pci_framebuffers()
> > >   drm/vc4: use simpler remove_conflicting_framebuffers(NULL)
> > >   drm/sun4i: use simpler remove_conflicting_framebuffers(NULL)
> > >   drm/tegra: kick out simplefb
> > > 
> > >  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 +--------
> > >  drivers/gpu/drm/bochs/bochs_drv.c        | 18 +------
> > >  drivers/gpu/drm/cirrus/cirrus_drv.c      | 23 +--------
> > >  drivers/gpu/drm/mgag200/mgag200_drv.c    | 21 +-------
> > >  drivers/gpu/drm/mgag200/mgag200_main.c   |  9 ----
> > >  drivers/gpu/drm/radeon/radeon_drv.c      | 23 +--------
> > >  drivers/gpu/drm/sun4i/sun4i_drv.c        | 18 +------
> > >  drivers/gpu/drm/tegra/drm.c              |  4 ++
> > >  drivers/gpu/drm/vc4/vc4_drv.c            | 20 +-------
> > >  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 24 ++-------
> > >  drivers/video/fbdev/core/fbmem.c         | 63 +++++++++++++++++++++++-
> > >  include/drm/drm_fb_helper.h              | 12 +++++
> > >  include/linux/fb.h                       |  2 +
> > >  13 files changed, 89 insertions(+), 172 deletions(-)
> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH v3 04/13] fbdev: add remove_conflicting_pci_framebuffers()

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 25151 bytes --]

Hi Michał,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.19-rc2 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Micha-Miros-aw/remove_conflicting_framebuffers-cleanup/20180903-094322
reproduce: make htmldocs
:::::: branch date: 5 hours ago
:::::: commit date: 5 hours ago

All warnings (new ones prefixed by >>):

   WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org)
   include/linux/srcu.h:175: warning: Function parameter or member 'p' not described in 'srcu_dereference_notrace'
   include/linux/srcu.h:175: warning: Function parameter or member 'sp' not described in 'srcu_dereference_notrace'
   include/linux/gfp.h:1: warning: no structured comments found
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ibss' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.connect' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.keys' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ie' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ie_len' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.bssid' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.ssid' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.default_key' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.default_mgmt_key' not described in 'wireless_dev'
   include/net/cfg80211.h:4381: warning: Function parameter or member 'wext.prev_bssid_valid' not described in 'wireless_dev'
   include/net/mac80211.h:2328: warning: Function parameter or member 'radiotap_timestamp.units_pos' not described in 'ieee80211_hw'
   include/net/mac80211.h:2328: warning: Function parameter or member 'radiotap_timestamp.accuracy' not described in 'ieee80211_hw'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.rates' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.rts_cts_rate_idx' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.use_rts' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.use_cts_prot' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.short_preamble' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.skip_table' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.jiffies' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.vif' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.hw_key' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.flags' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'control.enqueue_time' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'ack' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'ack.cookie' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.rates' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.ack_signal' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.ampdu_ack_len' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.ampdu_len' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.antenna' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.tx_time' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.is_valid_ack_signal' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'status.status_driver_data' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'driver_rates' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'pad' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:977: warning: Function parameter or member 'rate_driver_data' not described in 'ieee80211_tx_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg.signal' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'rx_stats_avg.chain_signal' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.filtered' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.retry_failed' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.retry_count' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.lost_packets' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_tdls_pkt_time' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.msdu_retries' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.msdu_failed' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_ack' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.last_ack_signal' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.ack_signal_filled' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'status_stats.avg_ack_signal' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.packets' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.bytes' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.last_rate' not described in 'sta_info'
   net/mac80211/sta_info.h:588: warning: Function parameter or member 'tx_stats.msdu' not described in 'sta_info'
   include/linux/mod_devicetable.h:763: warning: Function parameter or member 'driver_data' not described in 'typec_device_id'
   kernel/sched/fair.c:3371: warning: Function parameter or member 'flags' not described in 'attach_entity_load_avg'
   arch/x86/include/asm/atomic.h:84: warning: Excess function parameter 'i' description in 'arch_atomic_sub_and_test'
   arch/x86/include/asm/atomic.h:84: warning: Excess function parameter 'v' description in 'arch_atomic_sub_and_test'
   arch/x86/include/asm/atomic.h:96: warning: Excess function parameter 'v' description in 'arch_atomic_inc'
   arch/x86/include/asm/atomic.h:109: warning: Excess function parameter 'v' description in 'arch_atomic_dec'
   arch/x86/include/asm/atomic.h:124: warning: Excess function parameter 'v' description in 'arch_atomic_dec_and_test'
   arch/x86/include/asm/atomic.h:138: warning: Excess function parameter 'v' description in 'arch_atomic_inc_and_test'
   arch/x86/include/asm/atomic.h:153: warning: Excess function parameter 'i' description in 'arch_atomic_add_negative'
   arch/x86/include/asm/atomic.h:153: warning: Excess function parameter 'v' description in 'arch_atomic_add_negative'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.cb' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.poll' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.active' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.cb' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.poll' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.active' not described in 'dma_buf'
   include/linux/dma-fence-array.h:54: warning: Function parameter or member 'work' not described in 'dma_fence_array'
>> drivers/video/fbdev/core/fbmem.c:1848: warning: Function parameter or member 'res_id' not described in 'remove_conflicting_pci_framebuffers'
   drivers/video/fbdev/core/fbmem.c:1848: warning: Excess function parameter 'resource_id' description in 'remove_conflicting_pci_framebuffers'
   include/linux/gpio/driver.h:142: warning: Function parameter or member 'request_key' not described in 'gpio_irq_chip'
   include/linux/iio/hw-consumer.h:1: warning: no structured comments found
   include/linux/input/sparse-keymap.h:46: warning: Function parameter or member 'sw' not described in 'key_entry'
   drivers/pci/pci.c:218: warning: Excess function parameter 'p' description in 'pci_dev_str_match_path'
   include/linux/regulator/driver.h:227: warning: Function parameter or member 'resume' not described in 'regulator_ops'
   drivers/regulator/core.c:4479: warning: Excess function parameter 'state' description in 'regulator_suspend'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw0' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw1' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw2' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw3' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.eadm' not described in 'irb'
   drivers/slimbus/stream.c:1: warning: no structured comments found
   drivers/target/target_core_device.c:1: warning: no structured comments found
   drivers/usb/dwc3/gadget.c:510: warning: Excess function parameter 'dwc' description in 'dwc3_gadget_start_config'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/bus.c:1: warning: no structured comments found
   drivers/usb/typec/bus.c:268: warning: Function parameter or member 'mode' not described in 'typec_match_altmode'
   drivers/usb/typec/class.c:1497: warning: Excess function parameter 'drvdata' description in 'typec_port_register_altmode'
   drivers/usb/typec/class.c:1: warning: no structured comments found
   include/linux/w1.h:281: warning: Function parameter or member 'of_match_table' not described in 'w1_family'
   fs/direct-io.c:257: warning: Excess function parameter 'offset' description in 'dio_complete'
   fs/file_table.c:1: warning: no structured comments found
   fs/libfs.c:477: warning: Excess function parameter 'available' description in 'simple_write_end'
   fs/posix_acl.c:646: warning: Function parameter or member 'inode' not described in 'posix_acl_update_mode'
   fs/posix_acl.c:646: warning: Function parameter or member 'mode_p' not described in 'posix_acl_update_mode'
   fs/posix_acl.c:646: warning: Function parameter or member 'acl' not described in 'posix_acl_update_mode'
   drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:183: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_read_lock'
   drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:254: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_gfx'
   drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:302: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_hsa'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:3011: warning: Excess function parameter 'dev' description in 'amdgpu_vm_get_task_info'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:3012: warning: Function parameter or member 'adev' not described in 'amdgpu_vm_get_task_info'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:3012: warning: Excess function parameter 'dev' description in 'amdgpu_vm_get_task_info'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_pin' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_unpin' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_res_obj' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_get_sg_table' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_import_sg_table' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_vmap' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_vunmap' not described in 'drm_driver'
   include/drm/drm_drv.h:610: warning: Function parameter or member 'gem_prime_mmap' not described in 'drm_driver'
   include/drm/drm_panel.h:98: warning: Function parameter or member 'link' not described in 'drm_panel'
   drivers/gpu/drm/i915/i915_vma.h:49: warning: cannot understand function prototype: 'struct i915_vma '
   drivers/gpu/drm/i915/i915_vma.h:1: warning: no structured comments found
   drivers/gpu/drm/i915/intel_guc_fwif.h:553: warning: cannot understand function prototype: 'struct guc_log_buffer_state '
   drivers/gpu/drm/i915/i915_trace.h:1: warning: no structured comments found
   include/linux/skbuff.h:860: warning: Function parameter or member 'dev_scratch' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'list' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'ip_defrag_offset' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'skb_mstamp' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member '__cloned_offset' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'head_frag' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member '__pkt_type_offset' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'encapsulation' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'encap_hdr_csum' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'csum_valid' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'csum_complete_sw' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'csum_level' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'inner_protocol_type' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'remcsum_offload' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'offload_fwd_mark' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'offload_mr_fwd_mark' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'sender_cpu' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'reserved_tailroom' not described in 'sk_buff'
   include/linux/skbuff.h:860: warning: Function parameter or member 'inner_ipproto' not described in 'sk_buff'
   include/net/sock.h:238: warning: Function parameter or member 'skc_addrpair' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_portpair' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_ipv6only' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_net_refcnt' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_v6_daddr' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_v6_rcv_saddr' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_cookie' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_listener' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_tw_dr' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_rcv_wnd' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_tw_rcv_nxt' not described in 'sock_common'
   include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.rmem_alloc' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.len' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.head' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_backlog.tail' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_wq_raw' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'tcp_rtx_queue' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_route_forced_caps' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_txtime_report_errors' not described in 'sock'
   include/net/sock.h:509: warning: Function parameter or member 'sk_validate_xmit_skb' not described in 'sock'
   include/linux/netdevice.h:2018: warning: Function parameter or member 'adj_list.upper' not described in 'net_device'
   include/linux/netdevice.h:2018: warning: Function parameter or member 'adj_list.lower' not described in 'net_device'
   include/linux/netdevice.h:2018: warning: Function parameter or member 'gso_partial_features' not described in 'net_device'
   include/linux/netdevice.h:2018: warning: Function parameter or member 'switchdev_ops' not described in 'net_device'

# https://github.com/0day-ci/linux/commit/eed1edfa16cb1ed0b7530c47d080859c9a2036ec
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout eed1edfa16cb1ed0b7530c47d080859c9a2036ec
vim +1848 drivers/video/fbdev/core/fbmem.c

712f3147 drivers/video/fbmem.c            Linus Torvalds  2011-05-13  1833  
712f3147 drivers/video/fbmem.c            Linus Torvalds  2011-05-13  1834  /**
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1835   * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1836   * @pdev: PCI device
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1837   * @resource_id: index of PCI BAR configuring framebuffer memory
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1838   * @name: requesting driver name
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1839   *
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1840   * This function removes framebuffer devices (eg. initialized by firmware)
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1841   * using memory range configured for @pdev's BAR @resource_id.
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1842   *
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1843   * The function assumes that PCI device with shadowed ROM drives a primary
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1844   * display and so kicks out vga16fb.
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1845   */
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1846  int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1847  {
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01 @1848  	struct apertures_struct *ap;
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1849  	bool primary = false;
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1850  	int err;
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1851  
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1852  	ap = alloc_apertures(1);
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1853  	if (!ap)
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1854  		return -ENOMEM;
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1855  
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1856  	ap->ranges[0].base = pci_resource_start(pdev, res_id);
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1857  	ap->ranges[0].size = pci_resource_len(pdev, res_id);
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1858  #ifdef CONFIG_X86
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1859  	primary = pdev->resource[PCI_ROM_RESOURCE].flags &
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1860  					IORESOURCE_ROM_SHADOW;
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1861  #endif
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1862  	err = remove_conflicting_framebuffers(ap, name, primary);
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1863  	kfree(ap);
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1864  	return err;
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1865  }
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1866  EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
eed1edfa drivers/video/fbdev/core/fbmem.c Michał Mirosław 2018-09-01  1867  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH v3 03/13] fbdev: add kerneldoc do remove_conflicting_framebuffers()

[Paul Menzel]

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Dear Michał,


Thank you for documenting the function. Do you mean *to* instead of *do*
in the commit message summary?


On 09/01/18 16:08, Michał Mirosław wrote:
> Document remove_conflicting_framebuffers() behaviour.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
>  drivers/video/fbdev/core/fbmem.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 0df148eb4699..2de93b5014e3 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1775,6 +1775,16 @@ int unlink_framebuffer(struct fb_info *fb_info)
>  }
>  EXPORT_SYMBOL(unlink_framebuffer);
>  
> +/**
> + * remove_conflicting_framebuffers - remove firmware-configured framebuffers
> + * @a: memory range, users of which are to be removed
> + * @name: requesting driver name
> + * @primary: also kick vga16fb if present
> + *
> + * This function removes framebuffer devices (initialized by firmware/bootloader)
> + * which use memory range described by @a. If @a is NULL all such devices are
> + * removed.
> + */
>  int remove_conflicting_framebuffers(struct apertures_struct *a,
>  				    const char *name, bool primary)
>  {

Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>


Kind regards,

Paul


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