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Fri, 27 Jun 2025 09:04:06 +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 Jln7FIZeXmjuZQAAD6G6ig (envelope-from ); Fri, 27 Jun 2025 09:04:06 +0000 Message-ID: <54d8db0d-0e40-454e-bdfa-6ce9ce622118@suse.de> Date: Fri, 27 Jun 2025 11:04:05 +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: Shixiong Ou , 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> <24f53098-710a-43f9-8d1c-d809fb5354eb@163.com> <855d6faa-9f72-466e-9294-d6059bb9d920@suse.de> 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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -4.30 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,suse.de:mid] X-Spam-Level: Hi Am 27.06.25 um 10:48 schrieb Shixiong Ou: > > > 在 2025/6/27 16:12, Thomas Zimmermann 写道: >> Hi >> >> Am 27.06.25 um 10:07 schrieb Shixiong Ou: >>> >>> 在 2025/6/26 18:31, Thomas Zimmermann 写道: >>>> 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 >>>> >>>> The patch at >>>> >>>> https://patchwork.freedesktop.org/series/148057/ >>>> >>>> is supposed to fix the problem. It has been merged with v6.16-rc1 >>>> as commit 2f29b5c23101 ("video: screen_info: Relocate framebuffers >>>> behind PCI bridges"). It is in your tree? >>>> >>>> Best regards >>>> Thomas >>>> >>> yeah, this patch is in my tree. but do not fix the problem. >> >> The patch's final revision had a rough development. Just for testing >> purposes, could you revert the commit and instead apply the patch's >> earlier revision from >> >> https://patchwork.freedesktop.org/patch/649527/?series=148057&rev=1 >> >> ? >> >> Thanks a lot. >> >> Best regards >> Thomas >> > I have revert the commit and applied this patch, and added some prints as: > > +               printk("pcibios_bus_to_resource orginal: start = %llx, > end = %llx", > +                               r->start, r->end); > +               pcibios_bus_to_resource(pdev->bus, r, &bus_region); > +               printk("pcibios_bus_to_resource finished: start = > %llx, end = %llx", > +                               r->start, r->end); > + > > and the kernel message as follow: > > kylin@kylin-pc:~$ dmesg | grep pcibios_bus_to_resource > [    0.684698] pcibios_bus_to_resource orginal: start = 1020000000, > end = 10202fffff > [    0.684702] pcibios_bus_to_resource finished: start = 1020000000, > end = 10202fffff > > The address doesn't seem to have been modified. Thanks for confirming. > Best regards > Shixiong. > >>> >>> this is some message: >>> >>> kylin@kylin-pc:~$ dmesg | grep BAR >>> [    0.688192] pci 0000:00:03.0: BAR 15: assigned [mem >>> 0x1000000000-0x101fffffff 64bit pref] >>> [    0.688200] pci 0000:00:00.0: BAR 0: assigned [mem >>> 0x1020000000-0x10200fffff 64bit pref] >>> [    0.688205] pci 0000:00:00.0: BAR 14: assigned [mem >>> 0x58000000-0x580fffff] >>> [    0.688210] pci 0000:00:01.0: BAR 0: assigned [mem >>> 0x1020100000-0x10201fffff 64bit pref] >>> [    0.688215] pci 0000:00:02.0: BAR 0: assigned [mem >>> 0x1020200000-0x10202fffff 64bit pref] >>> [    0.688221] pci 0000:00:02.0: BAR 14: assigned [mem >>> 0x58100000-0x581fffff] >>> [    0.688225] pci 0000:00:03.0: BAR 0: assigned [mem >>> 0x1020300000-0x10203fffff 64bit pref] >>> [    0.688231] pci 0000:00:03.0: BAR 14: assigned [mem >>> 0x58200000-0x585fffff] >>> [    0.688237] pci 0000:00:04.0: BAR 0: assigned [mem >>> 0x1020400000-0x10204fffff 64bit pref] >>> [    0.688243] pci 0000:00:05.0: BAR 0: assigned [mem >>> 0x1020500000-0x10205fffff 64bit pref] >>> [    0.688249] pci 0000:00:05.0: BAR 14: assigned [mem >>> 0x58600000-0x586fffff] >>> [    0.688253] pci 0000:01:00.0: BAR 0: assigned [mem >>> 0x58000000-0x58003fff 64bit] >>> [    0.688290] pci 0000:03:00.0: BAR 6: assigned [mem >>> 0x58100000-0x5817ffff pref] >>> [    0.688296] pci 0000:03:00.0: BAR 0: assigned [mem >>> 0x58180000-0x58181fff] >>> [    0.688303] pci 0000:03:00.0: BAR 5: assigned [mem >>> 0x58182000-0x58183fff] >>> [    0.688317] pci 0000:04:00.0: BAR 1: assigned [mem >>> 0x1000000000-0x101fffffff 64bit pref] >>> [    0.688326] pci 0000:04:00.0: BAR 0: assigned [mem >>> 0x58200000-0x583fffff] >>> [    0.688332] pci 0000:04:00.0: BAR 6: assigned [mem >>> 0x58400000-0x584fffff pref] >>> [    0.688336] pci 0000:04:00.1: BAR 0: assigned [mem >>> 0x58500000-0x58503fff] >>> [    0.688360] pci 0000:06:00.0: BAR 0: assigned [mem >>> 0x58600000-0x58601fff 64bit] >>> kylin@kylin-pc:~$ dmesg | grep framebuffer >>> [    1.137536] efifb: framebuffer at 0x1020000000, using 3072k, >>> total 3072k >>> >>> the efifb base address is still at 0x1020000000 after calling >>> pcibios_bus_to_resource(). >>> >>> >>>>> 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. >>>>> >>>>> 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"); >>> >>> And should something be done >>> after __screen_info_relocation_is_valid() return false? >>> >>> Best regards >>> Shixiong. >>> >>>>>               } >>>>>           } >>>>> +    } 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)