From patchwork Wed Dec 9 00:24:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Widawsky X-Patchwork-Id: 341118 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 49206C4167B for ; Wed, 9 Dec 2020 00:28:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 16BD1224B0 for ; Wed, 9 Dec 2020 00:28:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732014AbgLIA10 (ORCPT ); Tue, 8 Dec 2020 19:27:26 -0500 Received: from mga09.intel.com ([134.134.136.24]:16954 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731963AbgLIA0S (ORCPT ); Tue, 8 Dec 2020 19:26:18 -0500 IronPort-SDR: GiOMss1028r+Gn5r+MOCm7hz8628P00XP3bhAjxED68agM7VzF6g2xxTZy9EudSJntYzjrWq3w etSVOMN+z7cg== X-IronPort-AV: E=McAfee;i="6000,8403,9829"; a="174142096" X-IronPort-AV: E=Sophos;i="5.78,404,1599548400"; d="scan'208";a="174142096" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Dec 2020 16:24:29 -0800 IronPort-SDR: sJ1HRcf/iJjZI7fHyYYvkJ4ktLx/cXdcJ8KMLv9oTnd56IUILKXY3VDk+2k+D0AKY5VXXCcp5n Bt4yLtIRI7Zg== X-IronPort-AV: E=Sophos;i="5.78,404,1599548400"; d="scan'208";a="407838520" Received: from mlubyani-mobl2.amr.corp.intel.com (HELO bwidawsk-mobl5.local) ([10.252.137.9]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Dec 2020 16:24:29 -0800 From: Ben Widawsky To: linux-cxl@vger.kernel.org Cc: Ben Widawsky , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Ira Weiny , Dan Williams , Vishal Verma , "Kelley, Sean V" , Rafael Wysocki , Bjorn Helgaas , Jonathan Cameron , Jon Masters , Chris Browy , Randy Dunlap , Christoph Hellwig Subject: [RFC PATCH 12/14] cxl: Add basic debugging Date: Tue, 8 Dec 2020 16:24:16 -0800 Message-Id: <20201209002418.1976362-13-ben.widawsky@intel.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201209002418.1976362-1-ben.widawsky@intel.com> References: <20201209002418.1976362-1-ben.widawsky@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Provide a standard debug function for use throughout the driver. Signed-off-by: Ben Widawsky --- drivers/cxl/cxl.h | 3 +++ drivers/cxl/mem.c | 26 +++++++++++++++++++++++++- 2 files changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 77c2dee6843c..e5afb89dab0b 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -9,6 +9,9 @@ #include #include +#define cxl_debug(fmt, ...) \ + pr_debug("CXL DEBUG: %s: " fmt, __func__, ##__VA_ARGS__) + #define CXL_SET_FIELD(value, field) \ ({ \ WARN_ON(!FIELD_FIT(field##_MASK, value)); \ diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index a2cea7ac7cc6..6b2f8d3776b5 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -122,9 +122,12 @@ static int cxl_mem_wait_for_doorbell(struct cxl_mem *cxlm) { const int timeout = msecs_to_jiffies(2000); const unsigned long start = jiffies; + unsigned long end = start; while (cxl_doorbell_busy(cxlm)) { - if (time_after(jiffies, start + timeout)) { + end = jiffies; + + if (time_after(end, start + timeout)) { /* Check again in case preempted before timeout test */ if (!cxl_doorbell_busy(cxlm)) break; @@ -133,6 +136,8 @@ static int cxl_mem_wait_for_doorbell(struct cxl_mem *cxlm) cpu_relax(); } + cxl_debug("Doorbell wait took %dms", + jiffies_to_msecs(end) - jiffies_to_msecs(start)); return 0; } @@ -180,6 +185,8 @@ static int cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, } /* #4 */ + cxl_debug("Sending command to %s\n", + dev_driver_string(&cxlm->pdev->dev)); cxl_write_mbox_reg32(cxlm, CXLDEV_MB_CTRL_OFFSET, CXLDEV_MB_CTRL_DOORBELL); @@ -308,6 +315,8 @@ static int cxl_mem_open(struct inode *inode, struct file *file) if (!cxlmd) return -ENXIO; + cxl_debug("Opened %pD\n", file); + file->private_data = cxlmd; return 0; @@ -383,6 +392,10 @@ static int handle_mailbox_cmd_from_user(struct cxl_memdev *cxlmd, .size_in = cmd->info.size_in, .size_out = size_out, }; + cxl_debug("Submitting command for user\n" + "\topcode: %x\n" + "\tsize: %zub/%zub\n", + mbox_cmd.opcode, mbox_cmd.size_in, mbox_cmd.size_out); rc = cxl_mem_mbox_send_cmd(cxlmd->cxlm, &mbox_cmd); cxl_mem_mbox_put(cxlmd->cxlm); if (rc) @@ -479,6 +492,8 @@ static long cxl_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg u32 n_commands; int i, j; + cxl_debug("Query IOCTL\n"); + if (get_user(n_commands, (u32 __user *)arg)) return -EFAULT; @@ -511,6 +526,8 @@ static long cxl_mem_ioctl(struct file *file, unsigned int cmd, unsigned long arg struct cxl_mem_command c; int rc; + cxl_debug("Send IOCTL\n"); + rc = cxl_validate_cmd_from_user(u, &c); if (rc) return rc; @@ -843,6 +860,13 @@ static int cxl_mem_identify(struct cxl_mem *cxlm) id = (struct cxl_mbox_identify *)mbox_cmd.payload; + cxl_debug("Driver identify command\n" + "\tFirmware Version: %s\n" + "\tTotal Capacity: %llu (%llu persistent)\n" + "\tLSA size: %u\n", + id->fw_revision, id->total_capacity, id->persistent_capacity, + id->lsa_size); + /* * TODO: enumerate DPA map, as 'ram' and 'pmem' do not alias. * For now, only the capacity is exported in sysfs