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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Thomas Zimmermann <tzimmermann@suse.de>,
        Javier Martinez Canillas <javierm@redhat.com>
Subject: [PATCH 6.0 20/20] fbdev/core: Remove remove_conflicting_pci_framebuffers()
Date:   Mon, 24 Oct 2022 13:31:22 +0200
Message-Id: <20221024112935.205547130@linuxfoundation.org>
In-Reply-To: <20221024112934.415391158@linuxfoundation.org>
References: <20221024112934.415391158@linuxfoundation.org>
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From: Thomas Zimmermann <tzimmermann@suse.de>

commit 9d69ef1838150c7d87afc1a87aa658c637217585 upstream.

Remove remove_conflicting_pci_framebuffers() and implement similar
functionality in aperture_remove_conflicting_pci_device(), which was
the only caller. Removes an otherwise unused interface and streamlines
the aperture helper. No functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220718072322.8927-5-tzimmermann@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/video/aperture.c         |   30 ++++++++++++++----------
 drivers/video/fbdev/core/fbmem.c |   48 ---------------------------------------
 include/linux/fb.h               |    2 -
 3 files changed, 18 insertions(+), 62 deletions(-)

--- a/drivers/video/aperture.c
+++ b/drivers/video/aperture.c
@@ -335,30 +335,36 @@ EXPORT_SYMBOL(aperture_remove_conflictin
  */
 int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name)
 {
+	bool primary = false;
 	resource_size_t base, size;
 	int bar, ret;
 
-	/*
-	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
-	 * otherwise the vga fbdev driver falls over.
-	 */
-#if IS_REACHABLE(CONFIG_FB)
-	ret = remove_conflicting_pci_framebuffers(pdev, name);
-	if (ret)
-		return ret;
+#ifdef CONFIG_X86
+	primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
 #endif
-	ret = vga_remove_vgacon(pdev);
-	if (ret)
-		return ret;
 
 	for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) {
 		if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
 			continue;
+
 		base = pci_resource_start(pdev, bar);
 		size = pci_resource_len(pdev, bar);
-		aperture_detach_devices(base, size);
+		ret = aperture_remove_conflicting_devices(base, size, primary, name);
+		if (ret)
+			break;
 	}
 
+	if (ret)
+		return ret;
+
+	/*
+	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
+	 * otherwise the vga fbdev driver falls over.
+	 */
+	ret = vga_remove_vgacon(pdev);
+	if (ret)
+		return ret;
+
 	return 0;
 
 }
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1788,54 +1788,6 @@ int remove_conflicting_framebuffers(stru
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
 
 /**
- * remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
- * @pdev: PCI device
- * @name: requesting driver name
- *
- * This function removes framebuffer devices (eg. initialized by firmware)
- * using memory range configured for any of @pdev's memory bars.
- *
- * 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, const char *name)
-{
-	struct apertures_struct *ap;
-	bool primary = false;
-	int err, idx, bar;
-
-	for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
-		if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
-			continue;
-		idx++;
-	}
-
-	ap = alloc_apertures(idx);
-	if (!ap)
-		return -ENOMEM;
-
-	for (idx = 0, bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
-		if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
-			continue;
-		ap->ranges[idx].base = pci_resource_start(pdev, bar);
-		ap->ranges[idx].size = pci_resource_len(pdev, bar);
-		pci_dbg(pdev, "%s: bar %d: 0x%lx -> 0x%lx\n", __func__, bar,
-			(unsigned long)pci_resource_start(pdev, bar),
-			(unsigned long)pci_resource_end(pdev, bar));
-		idx++;
-	}
-
-#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
  *
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -615,8 +615,6 @@ extern ssize_t fb_sys_write(struct fb_in
 /* drivers/video/fbmem.c */
 extern int register_framebuffer(struct fb_info *fb_info);
 extern void unregister_framebuffer(struct fb_info *fb_info);
-extern int remove_conflicting_pci_framebuffers(struct pci_dev *pdev,
-					       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);