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Fri, 27 Jun 2025 09:13:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id qW/TBqdgXmh6aAAAD6G6ig (envelope-from ); Fri, 27 Jun 2025 09:13:11 +0000 Message-ID: <3b3feb03-c417-4569-b7b0-44565d7cce4f@suse.de> Date: Fri, 27 Jun 2025 11:13:10 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] fbdev: efifb: do not load efifb if PCI BAR has changed but not fixuped To: oushixiong1025@163.com, Helge Deller Cc: Peter Jones , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Shixiong Ou References: <20250626094937.515552-1-oushixiong1025@163.com> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <20250626094937.515552-1-oushixiong1025@163.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_TO(0.00)[163.com,gmx.de]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCPT_COUNT_SEVEN(0.00)[7]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[163.com,gmx.de]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -4.30 Hi Am 26.06.25 um 11:49 schrieb oushixiong1025@163.com: > From: Shixiong Ou > > [WHY] > On an ARM machine, the following log is present: > [ 0.900884] efifb: framebuffer at 0x1020000000, using 3072k, total 3072k > [ 2.297884] amdgpu 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 0: 0x1000000000 -> 0x100fffffff > [ 2.297886] amdgpu 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 2: 0x1010000000 -> 0x10101fffff > [ 2.297888] amdgpu 0000:04:00.0: remove_conflicting_pci_framebuffers: bar 5: 0x58200000 -> 0x5823ffff > > It show that the efifb framebuffer base is out of PCI BAR, and this > results in both efi-framebuffer and amdgpudrmfb co-existing. > > The fbcon will be bound to efi-framebuffer by default and cannot be used. > > [HOW] > Do not load efifb driver if PCI BAR has changed but not fixuped. > In the following cases: > 1. screen_info_lfb_pdev is NULL. > 2. __screen_info_relocation_is_valid return false. Apart from ruling out invalid screen_info, did you figure out why the relocation tracking didn't work? It would be good to fix this if possible. Best regards Thomas > > Signed-off-by: Shixiong Ou > --- > drivers/video/fbdev/efifb.c | 4 ++++ > drivers/video/screen_info_pci.c | 24 ++++++++++++++++++++++++ > include/linux/screen_info.h | 5 +++++ > 3 files changed, 33 insertions(+) > > diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c > index 0e1bd3dba255..de8d016c9a66 100644 > --- a/drivers/video/fbdev/efifb.c > +++ b/drivers/video/fbdev/efifb.c > @@ -303,6 +303,10 @@ static void efifb_setup(struct screen_info *si, char *options) > > static inline bool fb_base_is_valid(struct screen_info *si) > { > + /* check whether fb_base has changed but not fixuped */ > + if (!screen_info_is_useful()) > + return false; > + > if (si->lfb_base) > return true; > > diff --git a/drivers/video/screen_info_pci.c b/drivers/video/screen_info_pci.c > index 66bfc1d0a6dc..ac57dcaf0cac 100644 > --- a/drivers/video/screen_info_pci.c > +++ b/drivers/video/screen_info_pci.c > @@ -9,6 +9,8 @@ static struct pci_dev *screen_info_lfb_pdev; > static size_t screen_info_lfb_bar; > static resource_size_t screen_info_lfb_res_start; // original start of resource > static resource_size_t screen_info_lfb_offset; // framebuffer offset within resource > +static bool screen_info_changed; > +static bool screen_info_fixuped; > > static bool __screen_info_relocation_is_valid(const struct screen_info *si, struct resource *pr) > { > @@ -24,6 +26,24 @@ static bool __screen_info_relocation_is_valid(const struct screen_info *si, stru > return true; > } > > +bool screen_info_is_useful(void) > +{ > + unsigned int type; > + const struct screen_info *si = &screen_info; > + > + type = screen_info_video_type(si); > + if (type != VIDEO_TYPE_EFI) > + return true; > + > + if (screen_info_changed && !screen_info_fixuped) { > + pr_warn("The screen_info has changed but not fixuped"); > + return false; > + } > + > + pr_info("The screen_info is useful"); > + return true; > +} > + > void screen_info_apply_fixups(void) > { > struct screen_info *si = &screen_info; > @@ -32,18 +52,22 @@ void screen_info_apply_fixups(void) > struct resource *pr = &screen_info_lfb_pdev->resource[screen_info_lfb_bar]; > > if (pr->start != screen_info_lfb_res_start) { > + screen_info_changed = true; > if (__screen_info_relocation_is_valid(si, pr)) { > /* > * Only update base if we have an actual > * relocation to a valid I/O range. > */ > __screen_info_set_lfb_base(si, pr->start + screen_info_lfb_offset); > + screen_info_fixuped = true; > pr_info("Relocating firmware framebuffer to offset %pa[d] within %pr\n", > &screen_info_lfb_offset, pr); > } else { > pr_warn("Invalid relocating, disabling firmware framebuffer\n"); > } > } > + } else { > + screen_info_changed = true; > } > } > > diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h > index 923d68e07679..632cdbb1adbe 100644 > --- a/include/linux/screen_info.h > +++ b/include/linux/screen_info.h > @@ -138,9 +138,14 @@ ssize_t screen_info_resources(const struct screen_info *si, struct resource *r, > u32 __screen_info_lfb_bits_per_pixel(const struct screen_info *si); > > #if defined(CONFIG_PCI) > +bool screen_info_is_useful(void); > void screen_info_apply_fixups(void); > struct pci_dev *screen_info_pci_dev(const struct screen_info *si); > #else > +bool screen_info_is_useful(void) > +{ > + return true; > +} > static inline void screen_info_apply_fixups(void) > { } > static inline struct pci_dev *screen_info_pci_dev(const struct screen_info *si) -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)