From patchwork Tue Jun 25 15:08:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fredrik Noring X-Patchwork-Id: 11015895 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8C80414E5 for ; Tue, 25 Jun 2019 15:08:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7932228C35 for ; Tue, 25 Jun 2019 15:08:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6D4DE28C49; Tue, 25 Jun 2019 15:08:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E8E8528C42 for ; Tue, 25 Jun 2019 15:08:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731866AbfFYPIm (ORCPT ); Tue, 25 Jun 2019 11:08:42 -0400 Received: from pio-pvt-msa3.bahnhof.se ([79.136.2.42]:47660 "EHLO pio-pvt-msa3.bahnhof.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731330AbfFYPIl (ORCPT ); Tue, 25 Jun 2019 11:08:41 -0400 Received: from localhost (localhost [127.0.0.1]) by pio-pvt-msa3.bahnhof.se (Postfix) with ESMTP id CA9AD3F732; Tue, 25 Jun 2019 17:08:33 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at bahnhof.se Received: from pio-pvt-msa3.bahnhof.se ([127.0.0.1]) by localhost (pio-pvt-msa3.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1mKKqNFww7JF; Tue, 25 Jun 2019 17:08:24 +0200 (CEST) Received: from localhost (h-41-252.A163.priv.bahnhof.se [46.59.41.252]) (Authenticated sender: mb547485) by pio-pvt-msa3.bahnhof.se (Postfix) with ESMTPA id 12E773F3B2; Tue, 25 Jun 2019 17:08:23 +0200 (CEST) Date: Tue, 25 Jun 2019 17:08:23 +0200 From: Fredrik Noring To: Christoph Hellwig Cc: Guenter Roeck , laurentiu.tudor@nxp.com, stern@rowland.harvard.edu, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, marex@denx.de, leoyang.li@nxp.com, linux-kernel@vger.kernel.org, robin.murphy@arm.com, JuergenUrban@gmx.de Subject: [PATCH 2/2] usb: host: Fix excessive alignment restriction for local memory allocations Message-ID: <20190625150823.GB2560@sx9> References: <20190611190343.GA18459@roeck-us.net> <20190613134033.GA2489@sx9> <20190613153414.GA909@sx9> <3f2164cd-7655-b7cc-ec57-d8751886728c@roeck-us.net> <20190614142816.GA2574@sx9> <20190624063515.GA3296@lst.de> <20190624125916.GA2516@sx9> <20190625060000.GA28986@lst.de> <20190625150558.GA2560@sx9> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190625150558.GA2560@sx9> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The PAGE_SHIFT alignment restriction to devm_gen_pool_create() quickly exhaust local memory because most allocations are much smaller than PAGE_SIZE. This causes USB device failures such as usb 1-2.1: reset full-speed USB device number 4 using sm501-usb sd 1:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x03 driverbyte=0x00 sd 1:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 00 08 7c 00 00 f0 00 print_req_error: I/O error, dev sda, sector 2172 flags 80700 when trying to boot from the SM501 USB controller on SH4 with QEMU. Align allocations as required but not necessarily much more than that. The HCCA, TD and ED structures align with 256, 32 and 16 byte memory boundaries, as specified by the Open HCI[1]. The min_alloc_order argument to devm_gen_pool_create is now somewhat arbitrarily set to 4 (16 bytes). Perhaps it could be somewhat lower for general buffer allocations. Reference: [1] "Open Host Controller Interface Specification for USB", release 1.0a, Compaq, Microsoft, National Semiconductor, 1999, pp. 16, 19, 33. Reported-by: Guenter Roeck Signed-off-by: Fredrik Noring Tested-by: Guenter Roeck --- drivers/usb/core/hcd.c | 2 +- drivers/usb/host/ohci-hcd.c | 4 ++-- drivers/usb/host/ohci-mem.c | 6 ++++-- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index b2362303d32f..48483fa71854 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -3014,7 +3014,7 @@ int usb_hcd_setup_local_mem(struct usb_hcd *hcd, phys_addr_t phys_addr, int err; void __iomem *local_mem; - hcd->localmem_pool = devm_gen_pool_create(hcd->self.sysdev, PAGE_SHIFT, + hcd->localmem_pool = devm_gen_pool_create(hcd->self.sysdev, 4, dev_to_node(hcd->self.sysdev), dev_name(hcd->self.sysdev)); if (IS_ERR(hcd->localmem_pool)) diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c index 5801858d867e..b457fdaff297 100644 --- a/drivers/usb/host/ohci-hcd.c +++ b/drivers/usb/host/ohci-hcd.c @@ -507,9 +507,9 @@ static int ohci_init (struct ohci_hcd *ohci) ohci->prev_frame_no = IO_WATCHDOG_OFF; if (hcd->localmem_pool) - ohci->hcca = gen_pool_dma_alloc(hcd->localmem_pool, + ohci->hcca = gen_pool_dma_alloc_align(hcd->localmem_pool, sizeof(*ohci->hcca), - &ohci->hcca_dma); + &ohci->hcca_dma, 256); else ohci->hcca = dma_alloc_coherent(hcd->self.controller, sizeof(*ohci->hcca), diff --git a/drivers/usb/host/ohci-mem.c b/drivers/usb/host/ohci-mem.c index 4afe27cc7e46..1425335c6baf 100644 --- a/drivers/usb/host/ohci-mem.c +++ b/drivers/usb/host/ohci-mem.c @@ -94,7 +94,8 @@ td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) struct usb_hcd *hcd = ohci_to_hcd(hc); if (hcd->localmem_pool) - td = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*td), &dma); + td = gen_pool_dma_zalloc_align(hcd->localmem_pool, + sizeof(*td), &dma, 32); else td = dma_pool_zalloc(hc->td_cache, mem_flags, &dma); if (td) { @@ -137,7 +138,8 @@ ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags) struct usb_hcd *hcd = ohci_to_hcd(hc); if (hcd->localmem_pool) - ed = gen_pool_dma_zalloc(hcd->localmem_pool, sizeof(*ed), &dma); + ed = gen_pool_dma_zalloc_align(hcd->localmem_pool, + sizeof(*ed), &dma, 16); else ed = dma_pool_zalloc(hc->ed_cache, mem_flags, &dma); if (ed) {