From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D19C12D1F1; Mon, 23 Dec 2024 16:10:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734970207; cv=none; b=jXVMpO2uamHKZW36PE1W0yZyOjtEAMRMppqT7LjnfxZ1BG6DbJhVVTwBgUwZVqg8NzdYDcFGQ7cIgNtGqzThE1Xc+HXWWixc63WkyaAX2nNl9rW0dr5B4b+GPs0IxYU72x436LJ0c3dl+xW/ErjhJhRAp5ZCzf5Kn4PBm1OqX+A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734970207; c=relaxed/simple; bh=yJ70cLoTJCcTvffA3nBTAOHMDlyo/7JsMhHFqPgq05E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DquRd+W7ukMGoK9yeea0xhOjD/oN8ZAkc42RfcJUk0AzWbr8p1lemGGnP+QdPa26P87zAEd4meK/uRN8Oyis4esIRQlrkM+1MuysZlIoNl4ebIZRNpvBj6hERajDBOgeT2eurmLvl+FHEIqP8rAXM3/fhNUVEnlwg7ra3sFzIrY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zqCoRbmX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zqCoRbmX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4921C4CED3; Mon, 23 Dec 2024 16:10:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734970207; bh=yJ70cLoTJCcTvffA3nBTAOHMDlyo/7JsMhHFqPgq05E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zqCoRbmXsN2LXriSp2zvulyzZC+RAZONMd2PjPKTkgop0JI5oVc5WfkCHaV/lr2xF Bu7/9//ZuXXvL8q5s7L5Oa2I973dgfU0SqR3dEDshpfvNVKrszQtCYo87M1a4JfuED mrxJXOAbj5SYHPKYL2NFHagS9CurE9BHg49VnGYU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shinichiro Kawasaki , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sasha Levin Subject: [PATCH 6.6 016/116] p2sb: Move P2SB hide and unhide code to p2sb_scan_and_cache() Date: Mon, 23 Dec 2024 16:58:06 +0100 Message-ID: <20241223155400.184079507@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241223155359.534468176@linuxfoundation.org> References: <20241223155359.534468176@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Shin'ichiro Kawasaki [ Upstream commit 0286070c74ee48391fc07f7f617460479472d221 ] To prepare for the following fix, move the code to hide and unhide the P2SB device from p2sb_cache_resources() to p2sb_scan_and_cache(). Signed-off-by: Shin'ichiro Kawasaki Reviewed-by: Hans de Goede Link: https://lore.kernel.org/r/20241128002836.373745-4-shinichiro.kawasaki@wdc.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen Stable-dep-of: 360c400d0f56 ("p2sb: Do not scan and remove the P2SB device when it is unhidden") Signed-off-by: Sasha Levin --- drivers/platform/x86/p2sb.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/platform/x86/p2sb.c b/drivers/platform/x86/p2sb.c index d015ddc9f30e..6fb76b82ecce 100644 --- a/drivers/platform/x86/p2sb.c +++ b/drivers/platform/x86/p2sb.c @@ -97,6 +97,14 @@ static void p2sb_scan_and_cache_devfn(struct pci_bus *bus, unsigned int devfn) static int p2sb_scan_and_cache(struct pci_bus *bus, unsigned int devfn) { + /* + * The BIOS prevents the P2SB device from being enumerated by the PCI + * subsystem, so we need to unhide and hide it back to lookup the BAR. + * Unhide the P2SB device here, if needed. + */ + if (p2sb_hidden_by_bios) + pci_bus_write_config_dword(bus, devfn, P2SBC, 0); + /* Scan the P2SB device and cache its BAR0 */ p2sb_scan_and_cache_devfn(bus, devfn); @@ -104,6 +112,10 @@ static int p2sb_scan_and_cache(struct pci_bus *bus, unsigned int devfn) if (devfn == P2SB_DEVFN_GOLDMONT) p2sb_scan_and_cache_devfn(bus, SPI_DEVFN_GOLDMONT); + /* Hide the P2SB device, if it was hidden */ + if (p2sb_hidden_by_bios) + pci_bus_write_config_dword(bus, devfn, P2SBC, P2SBC_HIDE); + if (!p2sb_valid_resource(&p2sb_resources[PCI_FUNC(devfn)].res)) return -ENOENT; @@ -152,22 +164,11 @@ static int p2sb_cache_resources(void) */ pci_lock_rescan_remove(); - /* - * The BIOS prevents the P2SB device from being enumerated by the PCI - * subsystem, so we need to unhide and hide it back to lookup the BAR. - * Unhide the P2SB device here, if needed. - */ pci_bus_read_config_dword(bus, devfn_p2sb, P2SBC, &value); p2sb_hidden_by_bios = value & P2SBC_HIDE; - if (p2sb_hidden_by_bios) - pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, 0); ret = p2sb_scan_and_cache(bus, devfn_p2sb); - /* Hide the P2SB device, if it was hidden */ - if (p2sb_hidden_by_bios) - pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, P2SBC_HIDE); - pci_unlock_rescan_remove(); return ret; -- 2.39.5