From patchwork Thu Nov 26 13:29:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 333975 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 D5695C64E8A for ; Thu, 26 Nov 2020 13:30:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 78352221E2 for ; Thu, 26 Nov 2020 13:30:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="F1hEmG2p"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="kNZaTeKs" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390078AbgKZNaf (ORCPT ); Thu, 26 Nov 2020 08:30:35 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:56550 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390051AbgKZNaf (ORCPT ); Thu, 26 Nov 2020 08:30:35 -0500 From: Sebastian Andrzej Siewior DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1606397433; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Eq8zX1hG/IVKLKYDpk4avTvLjQi6a7SB9a8YWbl+fNg=; b=F1hEmG2pDyoBl1o+RDcGhJFdbY3FdBMLCOYEsMc/YQmVK/lC5EsLJdlR/66cXZiTj0zdUs coCH94z+zjEk/sAFy/YmsbWzStZbhdKTI8YmfotJ3udVzUcv03+pNpmBvRVjjT7Si4GkHl kB4X/6A5ZN8RjJh+y7rkyTzBehTl88fKCmteK/SccJZUeptpucF75CzqN6cQ7A6aOqoEUb sUYuFgoYEaueclQbz3OmqlZyN+o8DZSZOSJNAJJDhWm94wxchp5UgiMXLY3R9wtZszn7QO KGqRDbbq6LXEpc09h9Vc5qL02VYlf01xNWyu5hF4ivNdQpDmCTfBYI1cOgah6w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1606397433; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Eq8zX1hG/IVKLKYDpk4avTvLjQi6a7SB9a8YWbl+fNg=; b=kNZaTeKsHj3jVY2UY3u55E+u+BRRThXEEuNpdZJBq99VPCJj1DRVQJTOLlWw5mGNf18DNJ Tp4J/bzWNgyEdlCw== To: linux-scsi@vger.kernel.org Cc: Finn Thain , GR-QLogic-Storage-Upstream@marvell.com, Hannes Reinecke , Jack Wang , John Garry , linux-m68k@lists.linux-m68k.org, Manish Rangankar , Michael Schmitz , MPT-FusionLinux.pdl@broadcom.com, Nilesh Javali , Sathya Prakash , Sreekanth Reddy , Suganath Prabu Subramani , Vikram Auradkar , Xiang Chen , Xiaofei Tan , "James E . J . Bottomley" , "Martin K . Petersen" , Thomas Gleixner , "Ahmed S . Darwish" , Sebastian Andrzej Siewior Subject: [PATCH 06/14] scsi: qla2xxx: init/os: Remove in_interrupt(). Date: Thu, 26 Nov 2020 14:29:44 +0100 Message-Id: <20201126132952.2287996-7-bigeasy@linutronix.de> In-Reply-To: <20201126132952.2287996-1-bigeasy@linutronix.de> References: <20201126132952.2287996-1-bigeasy@linutronix.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: "Ahmed S. Darwish" qla83xx_wait_logic() is used to control the frequency of device IDC lock retries. If in_interrupt() is true, it does 20 loops of cpu_relax(). Otherwise, it sleeps for 100ms and yields the CPU. While in_interrupt() is ill-defined and does not provide what the name suggests, it is not needed here: that qla83xx_wait_logic() is exclusively called by qla83xx_idc_lock() / unlock(), and they always run from process context. Below is an analysis of all the idc lock/unlock callers, in order of appearance: - qla_os.c: qla83xx_nic_core_unrecoverable_work(), qla83xx_idc_state_handler_work(), qla83xx_nic_core_reset_work(), qla83xx_service_idc_aen(), all workqueue context - qla_os.c: qla83xx_check_nic_core_fw_alive(), has msleep() - qla_os.c: qla83xx_set_drv_presence(), called once from qla2x00_abort_isp(), which is bound to process-context ->abort_isp() hook. It also invokes wait_for_completion_timeout() through the chain qla2x00_configure_hba() => qla24xx_link_initialize() => qla2x00_mailbox_command(). - qla_os.c: qla83xx_clear_drv_presence(), which is called from qla2x00_abort_isp() discussed above, and from qla2x00_remove_one() which is PCI process-context ->remove() hook. - qla_os.c: qla83xx_need_reset_handler(), has a one second msleep() in a loop. - qla_os.c: qla83xx_device_bootstrap(), called only by qla83xx_idc_state_handler(), which has multiple msleep() invocations. - qla_os.c: qla83xx_idc_state_handler(), multiple msleep() invocations. - qla_attr.c: qla2x00_sysfs_write_reset(), sysfs bin_attribute ->write() hook, process context - qla_init.c: qla83xx_nic_core_fw_load() => qla_init.c: qla2x00_initialize_adapter() => bound to isp_operations ->initialize_adapter() hook ** => qla_os.c: qla2x00_probe_one(), PCI ->probe() process ctx - qla_init.c: qla83xx_initiating_reset(), msleep() in a loop. - qla_init.c: qla83xx_nic_core_reset(), called by qla83xx_nic_core_reset_work(), workqueue context. Remove the in_interrupt() check, and thus replace the entirety of qla83xx_wait_logic() with an msleep(QLA83XX_WAIT_LOGIC_MS). Mark qla83xx_idc_lock() / unlock() with "Context: task, can sleep". Signed-off-by: Ahmed S. Darwish Signed-off-by: Sebastian Andrzej Siewior Cc: Nilesh Javali Cc: GR-QLogic-Storage-Upstream@marvell.com Reviewed-by: Daniel Wagner Reviewed-by: Himanshu Madhani --- drivers/scsi/qla2xxx/qla_os.c | 43 ++++++++++++++++------------------- 1 file changed, 19 insertions(+), 24 deletions(-) diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index f9c8ae9d669ef..2a8e065b192c3 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -5619,25 +5619,10 @@ qla83xx_service_idc_aen(struct work_struct *work) } } -static void -qla83xx_wait_logic(void) -{ - int i; - - /* Yield CPU */ - if (!in_interrupt()) { - /* - * Wait about 200ms before retrying again. - * This controls the number of retries for single - * lock operation. - */ - msleep(100); - schedule(); - } else { - for (i = 0; i < 20; i++) - cpu_relax(); /* This a nop instr on i386 */ - } -} +/* + * Control the frequency of IDC lock retries + */ +#define QLA83XX_WAIT_LOGIC_MS 100 static int qla83xx_force_lock_recovery(scsi_qla_host_t *base_vha) @@ -5727,7 +5712,7 @@ qla83xx_idc_lock_recovery(scsi_qla_host_t *base_vha) goto exit; if (o_drv_lockid == n_drv_lockid) { - qla83xx_wait_logic(); + msleep(QLA83XX_WAIT_LOGIC_MS); goto retry_lockid; } else return QLA_SUCCESS; @@ -5736,6 +5721,9 @@ qla83xx_idc_lock_recovery(scsi_qla_host_t *base_vha) return rval; } +/* + * Context: task, can sleep + */ void qla83xx_idc_lock(scsi_qla_host_t *base_vha, uint16_t requester_id) { @@ -5743,6 +5731,8 @@ qla83xx_idc_lock(scsi_qla_host_t *base_vha, uint16_t requester_id) uint32_t lock_owner; struct qla_hw_data *ha = base_vha->hw; + might_sleep(); + /* IDC-lock implementation using driver-lock/lock-id remote registers */ retry_lock: if (qla83xx_rd_reg(base_vha, QLA83XX_DRIVER_LOCK, &data) @@ -5761,7 +5751,7 @@ qla83xx_idc_lock(scsi_qla_host_t *base_vha, uint16_t requester_id) /* Retry/Perform IDC-Lock recovery */ if (qla83xx_idc_lock_recovery(base_vha) == QLA_SUCCESS) { - qla83xx_wait_logic(); + msleep(QLA83XX_WAIT_LOGIC_MS); goto retry_lock; } else ql_log(ql_log_warn, base_vha, 0xb075, @@ -6259,6 +6249,9 @@ void qla24xx_process_purex_list(struct purex_list *list) } } +/* + * Context: task, can sleep + */ void qla83xx_idc_unlock(scsi_qla_host_t *base_vha, uint16_t requester_id) { @@ -6269,6 +6262,8 @@ qla83xx_idc_unlock(scsi_qla_host_t *base_vha, uint16_t requester_id) uint32_t data; struct qla_hw_data *ha = base_vha->hw; + might_sleep(); + /* IDC-unlock implementation using driver-unlock/lock-id * remote registers */ @@ -6284,7 +6279,7 @@ qla83xx_idc_unlock(scsi_qla_host_t *base_vha, uint16_t requester_id) /* SV: XXX: IDC unlock retrying needed here? */ /* Retry for IDC-unlock */ - qla83xx_wait_logic(); + msleep(QLA83XX_WAIT_LOGIC_MS); retry++; ql_dbg(ql_dbg_p3p, base_vha, 0xb064, "Failed to release IDC lock, retrying=%d\n", retry); @@ -6292,7 +6287,7 @@ qla83xx_idc_unlock(scsi_qla_host_t *base_vha, uint16_t requester_id) } } else if (retry < 10) { /* Retry for IDC-unlock */ - qla83xx_wait_logic(); + msleep(QLA83XX_WAIT_LOGIC_MS); retry++; ql_dbg(ql_dbg_p3p, base_vha, 0xb065, "Failed to read drv-lockid, retrying=%d\n", retry); @@ -6308,7 +6303,7 @@ qla83xx_idc_unlock(scsi_qla_host_t *base_vha, uint16_t requester_id) if (qla83xx_access_control(base_vha, options, 0, 0, NULL)) { if (retry < 10) { /* Retry for IDC-unlock */ - qla83xx_wait_logic(); + msleep(QLA83XX_WAIT_LOGIC_MS); retry++; ql_dbg(ql_dbg_p3p, base_vha, 0xb066, "Failed to release IDC lock, retrying=%d\n", retry);