From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 299F34123D; Tue, 17 Oct 2023 10:26:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81E7D120; Tue, 17 Oct 2023 03:26:13 -0700 (PDT) X-SpamFilter-By: ArmorX SpamTrap 5.78 with qID 39HAPeE724097804, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36506.realtek.com.tw[172.21.6.27]) by rtits2.realtek.com.tw (8.15.2/2.93/5.92) with ESMTPS id 39HAPeE724097804 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 17 Oct 2023 18:25:40 +0800 Received: from RTEXMBS06.realtek.com.tw (172.21.6.99) by RTEXH36506.realtek.com.tw (172.21.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Tue, 17 Oct 2023 18:25:39 +0800 Received: from RTEXMBS01.realtek.com.tw (172.21.6.94) by RTEXMBS06.realtek.com.tw (172.21.6.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Tue, 17 Oct 2023 18:25:39 +0800 Received: from RTEXMBS01.realtek.com.tw ([fe80::9cb8:8d5:b6b3:213b]) by RTEXMBS01.realtek.com.tw ([fe80::9cb8:8d5:b6b3:213b%5]) with mapi id 15.01.2375.007; Tue, 17 Oct 2023 18:25:39 +0800 From: Ricky WU To: Lukas Wunner , Kai-Heng Feng CC: "bhelgaas@google.com" , "linux-pm@vger.kernel.org" , "linux-mmc@vger.kernel.org" , Kees Cook , Tony Luck , "Guilherme G. Piccoli" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hardening@vger.kernel.org" , "bpf@vger.kernel.org" Subject: RE: [PATCH] PCI: pciehp: Prevent child devices from doing RPM on PCIe Link Down Thread-Topic: [PATCH] PCI: pciehp: Prevent child devices from doing RPM on PCIe Link Down Thread-Index: AQHZ/+WX29Sx+yjN7keHtkFSV38Z/LBLoV4AgAIjnlA= Date: Tue, 17 Oct 2023 10:25:39 +0000 Message-ID: <263982e90fc046cf977ecb8727003690@realtek.com> References: <20231016040132.23824-1-kai.heng.feng@canonical.com> <20231016093210.GA22952@wunner.de> In-Reply-To: <20231016093210.GA22952@wunner.de> Accept-Language: zh-TW, en-US Content-Language: zh-TW x-originating-ip: [172.22.81.100] x-kse-serverinfo: RTEXMBS06.realtek.com.tw, 9 x-kse-antispam-interceptor-info: fallback x-kse-antivirus-interceptor-info: fallback Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-KSE-AntiSpam-Interceptor-Info: fallback X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net > On Mon, Oct 16, 2023 at 12:01:31PM +0800, Kai-Heng Feng wrote: > > When inserting an SD7.0 card to Realtek card reader, it can trigger > > PCI slot Link down and causes the following error: >=20 > Why does *inserting* a card cause a Link Down? >=20 >=20 > > [ 63.898861] pcieport 0000:00:1c.0: pciehp: Slot(8): Link Down > > [ 63.912118] BUG: unable to handle page fault for address: > ffffb24d403e5010 > [...] > > [ 63.912198] ? asm_exc_page_fault+0x27/0x30 > > [ 63.912203] ? ioread32+0x2e/0x70 > > [ 63.912206] ? rtsx_pci_write_register+0x5b/0x90 [rtsx_pci] > > [ 63.912217] rtsx_set_l1off_sub+0x1c/0x30 [rtsx_pci] > > [ 63.912226] rts5261_set_l1off_cfg_sub_d0+0x36/0x40 [rtsx_pci] > > [ 63.912234] rtsx_pci_runtime_idle+0xc7/0x160 [rtsx_pci] > > [ 63.912243] ? __pfx_pci_pm_runtime_idle+0x10/0x10 > > [ 63.912246] pci_pm_runtime_idle+0x34/0x70 > > [ 63.912248] rpm_idle+0xc4/0x2b0 > > [ 63.912251] pm_runtime_work+0x93/0xc0 > > [ 63.912254] process_one_work+0x21a/0x430 > > [ 63.912258] worker_thread+0x4a/0x3c0 >=20 > This looks like pcr->remap_addr is accessed after it has been iounmap'ed = in > rtsx_pci_remove() or before it has been iomap'ed in rtsx_pci_probe(). >=20 > Is the card reader itself located below a hotplug port and unplugged here= ? Yes it is card reader unplug itself, because sd7.0 card is not used rtsx_pc= r, it use nvme driver=20 Ricky > Or is this about the card being removed from the card reader? >=20 > Having full dmesg output and lspci -vvv output attached to a bugzilla wou= ld > help to understand what is going on. >=20 > Thanks, >=20 > Lukas