From owner-svn-src-all@FreeBSD.ORG Sat Oct 27 10:14:13 2012 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id B4704DFE; Sat, 27 Oct 2012 10:14:13 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 90BC08FC08; Sat, 27 Oct 2012 10:14:13 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q9RAED8D045420; Sat, 27 Oct 2012 10:14:13 GMT (envelope-from mav@svn.freebsd.org) Received: (from mav@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id q9RAEDiC045416; Sat, 27 Oct 2012 10:14:13 GMT (envelope-from mav@svn.freebsd.org) Message-Id: <201210271014.q9RAEDiC045416@svn.freebsd.org> From: Alexander Motin Date: Sat, 27 Oct 2012 10:14:13 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r242175 - in head/sys/cam: . scsi X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Oct 2012 10:14:13 -0000 Author: mav Date: Sat Oct 27 10:14:12 2012 New Revision: 242175 URL: http://svn.freebsd.org/changeset/base/242175 Log: Remove priority enforcement from xpt_ation(). It is not good and even not safe in some cases to reduce CCB priority after it was scheduled with high priority. This fixes reproducible deadlock when command sent through the pass interface while ATA XPT recovers from command timeout. Instead of that enforce priority at passioctl(). libcam provides no obvious interface to specify CCB priority and so much (all?) code specifies zero (highest) priority. This change limits pass CCBs priority to NORMAL run level, allowing XPT to complete bus and device recovery after reset before running any payload. Modified: head/sys/cam/cam.h head/sys/cam/cam_xpt.c head/sys/cam/scsi/scsi_pass.c Modified: head/sys/cam/cam.h ============================================================================== --- head/sys/cam/cam.h Sat Oct 27 09:40:29 2012 (r242174) +++ head/sys/cam/cam.h Sat Oct 27 10:14:12 2012 (r242175) @@ -83,6 +83,7 @@ typedef struct { #define CAM_PRIORITY_NORMAL ((CAM_RL_NORMAL << 8) + 0x80) #define CAM_PRIORITY_NONE (u_int32_t)-1 #define CAM_PRIORITY_TO_RL(x) ((x) >> 8) +#define CAM_RL_TO_PRIORITY(x) ((x) << 8) u_int32_t generation; int index; #define CAM_UNQUEUED_INDEX -1 Modified: head/sys/cam/cam_xpt.c ============================================================================== --- head/sys/cam/cam_xpt.c Sat Oct 27 09:40:29 2012 (r242174) +++ head/sys/cam/cam_xpt.c Sat Oct 27 10:14:12 2012 (r242175) @@ -2468,9 +2468,6 @@ xpt_action(union ccb *start_ccb) CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_TRACE, ("xpt_action\n")); start_ccb->ccb_h.status = CAM_REQ_INPROG; - /* Compatibility for RL-unaware code. */ - if (CAM_PRIORITY_TO_RL(start_ccb->ccb_h.pinfo.priority) == 0) - start_ccb->ccb_h.pinfo.priority += CAM_PRIORITY_NORMAL - 1; (*(start_ccb->ccb_h.path->bus->xport->action))(start_ccb); } Modified: head/sys/cam/scsi/scsi_pass.c ============================================================================== --- head/sys/cam/scsi/scsi_pass.c Sat Oct 27 09:40:29 2012 (r242174) +++ head/sys/cam/scsi/scsi_pass.c Sat Oct 27 10:14:12 2012 (r242175) @@ -521,6 +521,7 @@ passioctl(struct cdev *dev, u_long cmd, struct cam_periph *periph; struct pass_softc *softc; int error; + uint32_t priority; periph = (struct cam_periph *)dev->si_drv1; if (periph == NULL) @@ -553,6 +554,11 @@ passioctl(struct cdev *dev, u_long cmd, break; } + /* Compatibility for RL/priority-unaware code. */ + priority = inccb->ccb_h.pinfo.priority; + if (priority < CAM_RL_TO_PRIORITY(CAM_RL_NORMAL)) + priority += CAM_RL_TO_PRIORITY(CAM_RL_NORMAL); + /* * Non-immediate CCBs need a CCB from the per-device pool * of CCBs, which is scheduled by the transport layer. @@ -561,15 +567,14 @@ passioctl(struct cdev *dev, u_long cmd, */ if ((inccb->ccb_h.func_code & XPT_FC_QUEUED) && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) { - ccb = cam_periph_getccb(periph, - inccb->ccb_h.pinfo.priority); + ccb = cam_periph_getccb(periph, priority); ccb_malloced = 0; } else { ccb = xpt_alloc_ccb_nowait(); if (ccb != NULL) xpt_setup_ccb(&ccb->ccb_h, periph->path, - inccb->ccb_h.pinfo.priority); + priority); ccb_malloced = 1; }