From patchwork Wed Jan 17 12:39:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 764369 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 595B51EA7C for ; Wed, 17 Jan 2024 12:55:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705496133; cv=none; b=gC3HnabTwNFWGgqlBwhxfpAAP8FEZbUJ40Hb3A+lM5dj/X2UGDxNKci2bSwcHxS8jOPYFm8lwGjsY+svkaM9RMzz+Szk0acl4IW+4o+hFyqQrfJsLxesRFw5XnBcFadYg5V2J1b9W5zLJiYPOaOg8DOUiPhrnE7EZcBYa2xg69I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705496133; c=relaxed/simple; bh=iPpL4hKYyXuIyZRjNaFFbMGP+0QK5/WfRYOiqV4io2E=; h=Received:Received:Received:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding:X-Spamd-Result:X-Rspamd-Server: X-Rspamd-Queue-Id:X-Spam-Level:X-Spam-Score:X-Spam-Flag; b=OAt7oShVwUX5jX/VJCM+mEyg00Zwd9wSS/QU/8MDloZXtU7uof1PNsT5ExsCwnpMlBf6N3cl6kwV99PIM9kStmTYVZis+ew7v0j8lkvgRL05SmBjhdCBwpuY3Kmw1rIDsLzmAI2V+nO5x5IKUGsQYGw7FdxjBjxUrKlZvd4Un44= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; arc=none smtp.client-ip=195.135.223.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id CDC5221F12; Wed, 17 Jan 2024 12:55:30 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 9F97613800; Wed, 17 Jan 2024 12:55:30 +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 ELnUJULOp2X1YQAAD6G6ig (envelope-from ); Wed, 17 Jan 2024 12:55:30 +0000 From: Thomas Zimmermann To: javierm@redhat.com, pjones@redhat.com, deller@gmx.de, ardb@kernel.org Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 7/8] firmware/sysfb: Update screen_info for relocated EFI framebuffers Date: Wed, 17 Jan 2024 13:39:11 +0100 Message-ID: <20240117125527.23324-8-tzimmermann@suse.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240117125527.23324-1-tzimmermann@suse.de> References: <20240117125527.23324-1-tzimmermann@suse.de> Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Authentication-Results: smtp-out1.suse.de; none X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: CDC5221F12 X-Spam-Level: X-Spam-Score: -4.00 X-Spam-Flag: NO On ARM PCI systems, the PCI hierarchy might be reconfigured during boot and the firmware framebuffer might move as a result of that. The values in screen_info will then be invalid. Work around this problem by tracking the framebuffer's initial location before it get relocated; then fix the screen_info state between reloaction and creating the firmware framebuffer's device. This functionality has been lifted from efifb. See the commit message of commit 55d728a40d36 ("efi/fb: Avoid reconfiguration of BAR that covers the framebuffer") for more information. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas --- drivers/firmware/sysfb.c | 2 + drivers/video/screen_info_pci.c | 88 +++++++++++++++++++++++++++++++++ include/linux/screen_info.h | 16 ++++++ 3 files changed, 106 insertions(+) diff --git a/drivers/firmware/sysfb.c b/drivers/firmware/sysfb.c index 48a550bd1a93..5791f9dc47df 100644 --- a/drivers/firmware/sysfb.c +++ b/drivers/firmware/sysfb.c @@ -101,6 +101,8 @@ static __init int sysfb_init(void) bool compatible; int ret = 0; + screen_info_apply_fixups(); + mutex_lock(&disable_lock); if (disabled) goto unlock_mutex; diff --git a/drivers/video/screen_info_pci.c b/drivers/video/screen_info_pci.c index 16fe4afa3377..a546681b2d15 100644 --- a/drivers/video/screen_info_pci.c +++ b/drivers/video/screen_info_pci.c @@ -1,7 +1,95 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include +#include + +static struct pci_dev *screen_info_lfb_pdev; +static size_t screen_info_lfb_bar; +static resource_size_t screen_info_lfb_offset; +static struct resource screen_info_lfb_res = DEFINE_RES_MEM(0, 0); + +static bool __screen_info_relocation_is_valid(const struct screen_info *si, struct resource *pr) +{ + u64 size = __screen_info_lfb_size(si, screen_info_video_type(si)); + + if (screen_info_lfb_offset > resource_size(pr)) + return false; + if (size > resource_size(pr)) + return false; + if (resource_size(pr) - size < screen_info_lfb_offset) + return false; + + return true; +} + +void screen_info_apply_fixups(void) +{ + struct screen_info *si = &screen_info; + + if (screen_info_lfb_pdev) { + struct resource *pr = &screen_info_lfb_pdev->resource[screen_info_lfb_bar]; + + if (pr->start != screen_info_lfb_res.start) { + 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); + 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"); + } + } + } +} + +static void screen_info_fixup_lfb(struct pci_dev *pdev) +{ + unsigned int type; + struct resource res[SCREEN_INFO_MAX_RESOURCES]; + size_t i, numres; + int ret; + const struct screen_info *si = &screen_info; + + if (screen_info_lfb_pdev) + return; // already found + + type = screen_info_video_type(si); + if (type != VIDEO_TYPE_EFI) + return; // only applies to EFI + + ret = screen_info_resources(si, res, ARRAY_SIZE(res)); + if (ret < 0) + return; + numres = ret; + + for (i = 0; i < numres; ++i) { + struct resource *r = &res[i]; + const struct resource *pr; + + if (!(r->flags & IORESOURCE_MEM)) + continue; + pr = pci_find_resource(pdev, r); + if (!pr) + continue; + + /* + * We've found a PCI device with the framebuffer + * resource. Store away the parameters to track + * relocation of the framebuffer aperture. + */ + screen_info_lfb_pdev = pdev; + screen_info_lfb_bar = pr - pdev->resource; + screen_info_lfb_offset = r->start - pr->start; + memcpy(&screen_info_lfb_res, r, sizeof(screen_info_lfb_res)); + } +} +DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY, 16, + screen_info_fixup_lfb); static struct pci_dev *__screen_info_pci_dev(struct resource *res) { diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h index 746645b8ee83..80b348137492 100644 --- a/include/linux/screen_info.h +++ b/include/linux/screen_info.h @@ -4,6 +4,8 @@ #include +#include + /** * SCREEN_INFO_MAX_RESOURCES - maximum number of resources per screen_info */ @@ -27,6 +29,17 @@ static inline u64 __screen_info_lfb_base(const struct screen_info *si) return lfb_base; } +static inline void __screen_info_set_lfb_base(struct screen_info *si, u64 lfb_base) +{ + si->lfb_base = lfb_base & GENMASK_ULL(31, 0); + si->ext_lfb_base = (lfb_base & GENMASK_ULL(63, 32)) >> 32; + + if (si->ext_lfb_base) + si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; + else + si->capabilities &= ~VIDEO_CAPABILITY_64BIT_BASE; +} + static inline u64 __screen_info_lfb_size(const struct screen_info *si, unsigned int type) { u64 lfb_size = si->lfb_size; @@ -106,8 +119,11 @@ static inline unsigned int screen_info_video_type(const struct screen_info *si) int screen_info_resources(const struct screen_info *si, struct resource *r, size_t num); #if defined(CONFIG_PCI) +void screen_info_apply_fixups(void); struct pci_dev *screen_info_pci_dev(const struct screen_info *si); #else +static inline void screen_info_apply_fixups(void) +{ } static inline struct pci_dev *screen_info_pci_dev(const struct screen_info *si) { return NULL;