From patchwork Tue Feb 2 00:59:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Widawsky X-Patchwork-Id: 12188127 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D91C3C433E0 for ; Tue, 2 Feb 2021 01:01:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B236064EE4 for ; Tue, 2 Feb 2021 01:01:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229607AbhBBBBJ (ORCPT ); Mon, 1 Feb 2021 20:01:09 -0500 Received: from mga06.intel.com ([134.134.136.31]:21901 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229530AbhBBBBI (ORCPT ); Mon, 1 Feb 2021 20:01:08 -0500 IronPort-SDR: rozJ2YcPg/QYsQU6XTc1jUwxvJf397+RcpTv4Xr1lbag8iz5PwVU+I5msyXwXXBsbOsOxtfiQN z9lBLH+wzRJw== X-IronPort-AV: E=McAfee;i="6000,8403,9882"; a="242294608" X-IronPort-AV: E=Sophos;i="5.79,393,1602572400"; d="scan'208";a="242294608" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Feb 2021 17:00:02 -0800 IronPort-SDR: qEoc3mPJFZfoUqhR8riA1IgozfKwdzK9V1Fz4p+Z11ykbe5cQDFRgg9gQmO9NbhYBLU5srT2YA fnfMdN9Rk0tw== X-IronPort-AV: E=Sophos;i="5.79,393,1602572400"; d="scan'208";a="581764114" Received: from jambrizm-mobl1.amr.corp.intel.com (HELO bwidawsk-mobl5.local) ([10.252.133.15]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Feb 2021 17:00:01 -0800 From: Ben Widawsky To: qemu-devel@nongnu.org Cc: Ben Widawsky , linux-cxl@vger.kernel.org, Chris Browy , Dan Williams , David Hildenbrand , Igor Mammedov , Ira Weiny , Jonathan Cameron , Marcel Apfelbaum , Markus Armbruster , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Vishal Verma , "John Groves (jgroves)" , "Michael S. Tsirkin" Subject: [RFC PATCH v3 09/31] hw/cxl/device: Add log commands (8.2.9.4) + CEL Date: Mon, 1 Feb 2021 16:59:26 -0800 Message-Id: <20210202005948.241655-10-ben.widawsky@intel.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210202005948.241655-1-ben.widawsky@intel.com> References: <20210202005948.241655-1-ben.widawsky@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org CXL specification provides for the ability to obtain logs from the device. Logs are either spec defined, like the "Command Effects Log" (CEL), or vendor specific. UUIDs are defined for all log types. The CEL is a mechanism to provide information to the host about which commands are supported. It is useful both to determine which spec'd optional commands are supported, as well as provide a list of vendor specified commands that might be used. The CEL is already created as part of mailbox initialization, but here it is now exported to hosts that use these log commands. Signed-off-by: Ben Widawsky --- hw/cxl/cxl-mailbox-utils.c | 67 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c index 3d36614c0c..3f0ae8b9e5 100644 --- a/hw/cxl/cxl-mailbox-utils.c +++ b/hw/cxl/cxl-mailbox-utils.c @@ -46,6 +46,9 @@ enum { TIMESTAMP = 0x03, #define GET 0x0 #define SET 0x1 + LOGS = 0x04, + #define GET_SUPPORTED 0x0 + #define GET_LOG 0x1 }; /* 8.2.8.4.5.1 Command Return Codes */ @@ -122,6 +125,8 @@ define_mailbox_handler_zeroed(EVENTS_GET_INTERRUPT_POLICY, 4); define_mailbox_handler_nop(EVENTS_SET_INTERRUPT_POLICY); declare_mailbox_handler(TIMESTAMP_GET); declare_mailbox_handler(TIMESTAMP_SET); +declare_mailbox_handler(LOGS_GET_SUPPORTED); +declare_mailbox_handler(LOGS_GET_LOG); #define IMMEDIATE_CONFIG_CHANGE (1 << 1) #define IMMEDIATE_POLICY_CHANGE (1 << 3) @@ -137,6 +142,8 @@ static struct cxl_cmd cxl_cmd_set[256][256] = { CXL_CMD(EVENTS, SET_INTERRUPT_POLICY, 4, IMMEDIATE_CONFIG_CHANGE), CXL_CMD(TIMESTAMP, GET, 0, 0), CXL_CMD(TIMESTAMP, SET, 8, IMMEDIATE_POLICY_CHANGE), + CXL_CMD(LOGS, GET_SUPPORTED, 0, 0), + CXL_CMD(LOGS, GET_LOG, 0x18, 0), }; #undef CXL_CMD @@ -188,6 +195,66 @@ define_mailbox_handler(TIMESTAMP_SET) QemuUUID cel_uuid; +/* 8.2.9.4.1 */ +define_mailbox_handler(LOGS_GET_SUPPORTED) +{ + struct { + uint16_t entries; + uint8_t rsvd[6]; + struct { + QemuUUID uuid; + uint32_t size; + } log_entries[1]; + } __attribute__((packed)) *supported_logs = (void *)cmd->payload; + _Static_assert(sizeof(*supported_logs) == 0x1c, "Bad supported log size"); + + supported_logs->entries = 1; + supported_logs->log_entries[0].uuid = cel_uuid; + supported_logs->log_entries[0].size = 4 * cxl_dstate->cel_size; + + *len = sizeof(*supported_logs); + return CXL_MBOX_SUCCESS; +} + +/* 8.2.9.4.2 */ +define_mailbox_handler(LOGS_GET_LOG) +{ + struct { + QemuUUID uuid; + uint32_t offset; + uint32_t length; + } __attribute__((packed, __aligned__(16))) *get_log = (void *)cmd->payload; + + /* + * 8.2.9.4.2 + * The device shall return Invalid Parameter if the Offset or Length + * fields attempt to access beyond the size of the log as reported by Get + * Supported Logs. + * + * XXX: Spec is wrong, "Invalid Parameter" isn't a thing. + * XXX: Spec doesn't address incorrect UUID incorrectness. + * + * The CEL buffer is large enough to fit all commands in the emulation, so + * the only possible failure would be if the mailbox itself isn't big + * enough. + */ + if (get_log->offset + get_log->length > cxl_dstate->payload_size) { + return CXL_MBOX_INVALID_INPUT; + } + + if (!qemu_uuid_is_equal(&get_log->uuid, &cel_uuid)) { + return CXL_MBOX_UNSUPPORTED; + } + + /* Store off everything to local variables so we can wipe out the payload */ + *len = get_log->length; + + memmove(cmd->payload, cxl_dstate->cel_log + get_log->offset, + get_log->length); + + return CXL_MBOX_SUCCESS; +} + void cxl_process_mailbox(CXLDeviceState *cxl_dstate) { uint16_t ret = CXL_MBOX_SUCCESS;