From patchwork Mon Jan 24 17:16:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 12722475 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69531C433EF for ; Mon, 24 Jan 2022 17:21:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229882AbiAXRVs (ORCPT ); Mon, 24 Jan 2022 12:21:48 -0500 Received: from frasgout.his.huawei.com ([185.176.79.56]:4454 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244445AbiAXRVl (ORCPT ); Mon, 24 Jan 2022 12:21:41 -0500 Received: from fraeml705-chm.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4JjGrQ1T3sz67DqF; Tue, 25 Jan 2022 01:17:26 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml705-chm.china.huawei.com (10.206.15.54) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.21; Mon, 24 Jan 2022 18:21:39 +0100 Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 24 Jan 2022 17:21:39 +0000 From: Jonathan Cameron To: , Marcel Apfelbaum , "Michael S . Tsirkin" , Igor Mammedov CC: , Ben Widawsky , =?utf-8?q?Alex_Benn=C3=A9e?= , Peter Maydell , , Shameerali Kolothum Thodi , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Saransh Gupta1 , Shreyas Shah , Chris Browy , Samarth Saxena , "Dan Williams" Subject: [PATCH v4 09/42] hw/cxl/device: Timestamp implementation (8.2.9.3) Date: Mon, 24 Jan 2022 17:16:32 +0000 Message-ID: <20220124171705.10432-10-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220124171705.10432-1-Jonathan.Cameron@huawei.com> References: <20220124171705.10432-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhreml740-chm.china.huawei.com (10.201.108.190) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org From: Ben Widawsky Per spec, timestamp appears to be a free-running counter from a value set by the host via the Set Timestamp command (0301h). There are references to the epoch, which seem like a red herring. Therefore, the implementation implements the timestamp as freerunning counter from the last value that was issued by the Set Timestamp command. Signed-off-by: Ben Widawsky Signed-off-by: Jonathan Cameron --- hw/cxl/cxl-mailbox-utils.c | 53 +++++++++++++++++++++++++++++++++++++ include/hw/cxl/cxl_device.h | 6 +++++ 2 files changed, 59 insertions(+) diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c index 1a87846356..cea4b2a59c 100644 --- a/hw/cxl/cxl-mailbox-utils.c +++ b/hw/cxl/cxl-mailbox-utils.c @@ -43,6 +43,9 @@ enum { #define CLEAR_RECORDS 0x1 #define GET_INTERRUPT_POLICY 0x2 #define SET_INTERRUPT_POLICY 0x3 + TIMESTAMP = 0x03, + #define GET 0x0 + #define SET 0x1 }; /* 8.2.8.4.5.1 Command Return Codes */ @@ -117,8 +120,11 @@ define_mailbox_handler_zeroed(EVENTS_GET_RECORDS, 0x20); define_mailbox_handler_nop(EVENTS_CLEAR_RECORDS); 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); #define IMMEDIATE_CONFIG_CHANGE (1 << 1) +#define IMMEDIATE_POLICY_CHANGE (1 << 3) #define IMMEDIATE_LOG_CHANGE (1 << 4) #define CXL_CMD(s, c, in, cel_effect) \ @@ -129,10 +135,57 @@ static struct cxl_cmd cxl_cmd_set[256][256] = { CXL_CMD(EVENTS, CLEAR_RECORDS, ~0, IMMEDIATE_LOG_CHANGE), CXL_CMD(EVENTS, GET_INTERRUPT_POLICY, 0, 0), CXL_CMD(EVENTS, SET_INTERRUPT_POLICY, 4, IMMEDIATE_CONFIG_CHANGE), + CXL_CMD(TIMESTAMP, GET, 0, 0), + CXL_CMD(TIMESTAMP, SET, 8, IMMEDIATE_POLICY_CHANGE), }; #undef CXL_CMD +/* + * 8.2.9.3.1 + */ +define_mailbox_handler(TIMESTAMP_GET) +{ + struct timespec ts; + uint64_t delta; + + if (!cxl_dstate->timestamp.set) { + *(uint64_t *)cmd->payload = 0; + goto done; + } + + /* First find the delta from the last time the host set the time. */ + clock_gettime(CLOCK_REALTIME, &ts); + delta = (ts.tv_sec * NANOSECONDS_PER_SECOND + ts.tv_nsec) - + cxl_dstate->timestamp.last_set; + + /* Then adjust the actual time */ + stq_le_p(cmd->payload, cxl_dstate->timestamp.host_set + delta); + +done: + *len = 8; + return CXL_MBOX_SUCCESS; +} + +/* + * 8.2.9.3.2 + */ +define_mailbox_handler(TIMESTAMP_SET) +{ + struct timespec ts; + + clock_gettime(CLOCK_REALTIME, &ts); + + cxl_dstate->timestamp.set = true; + cxl_dstate->timestamp.last_set = + ts.tv_sec * NANOSECONDS_PER_SECOND + ts.tv_nsec; + + cxl_dstate->timestamp.host_set = le64_to_cpu(*(uint64_t *)cmd->payload); + + *len = 0; + return CXL_MBOX_SUCCESS; +} + QemuUUID cel_uuid; void cxl_process_mailbox(CXLDeviceState *cxl_dstate) diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h index f88f844cb6..3dde7fb1fb 100644 --- a/include/hw/cxl/cxl_device.h +++ b/include/hw/cxl/cxl_device.h @@ -114,6 +114,12 @@ typedef struct cxl_device_state { size_t cel_size; }; + struct { + bool set; + uint64_t last_set; + uint64_t host_set; + } timestamp; + /* memory region for persistent memory, HDM */ uint64_t pmem_size; } CXLDeviceState;