From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752951AbeDFNMZ (ORCPT ); Fri, 6 Apr 2018 09:12:25 -0400 Received: from mail-ot0-f194.google.com ([74.125.82.194]:35397 "EHLO mail-ot0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752588AbeDFNMX (ORCPT ); Fri, 6 Apr 2018 09:12:23 -0400 X-Google-Smtp-Source: AIpwx4+6A+jJQF8SizbgBQCpw2Tpi5KR/2NimgO9EANg5+VKlQ9pohNNqAsYC4ipmnpcf39Xd+4giA== From: Stuart Hayes Subject: [PATCH v4] dell_rbu: make firmware payload memory uncachable To: linux-kernel@vger.kernel.org Cc: Takashi Iwai Message-ID: Date: Fri, 6 Apr 2018 08:12:21 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The dell_rbu driver takes firmware update payloads and puts them in memory so the system BIOS can find them after a reboot. This sometimes fails (though rarely), because the memory containing the payload is in the CPU cache but never gets written back to main memory before the system is rebooted (CPU cache contents are lost on reboot). With this patch, the payload memory will be changed to uncachable to ensure that the payload is actually in main memory before the system is rebooted. Signed-off-by: Stuart Hayes --- v2 Added include, removed extra parentheses v3 Corrected formatting and include line v4 Moved set_memory_uc() outside the while loop so that the memory is definitely allocated before it is set to uncachable This driver has no maintainer. diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c index 2f452f1f7c8a..53f27a6e2d76 100644 --- a/drivers/firmware/dell_rbu.c +++ b/drivers/firmware/dell_rbu.c @@ -45,6 +45,7 @@ #include #include #include +#include MODULE_AUTHOR("Abhay Salunke "); MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); @@ -181,6 +182,11 @@ static int create_packet(void *data, size_t length) packet_data_temp_buf = NULL; } } + /* + * set to uncachable or it may never get written back before reboot + */ + set_memory_uc((unsigned long)packet_data_temp_buf, 1 << ordernum); + spin_lock(&rbu_data.lock); newpacket->data = packet_data_temp_buf; @@ -349,6 +355,8 @@ static void packet_empty_list(void) * to make sure there are no stale RBU packets left in memory */ memset(newpacket->data, 0, rbu_data.packetsize); + set_memory_wb((unsigned long)newpacket->data, + 1 << newpacket->ordernum); free_pages((unsigned long) newpacket->data, newpacket->ordernum); kfree(newpacket);