From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754691AbcGVM7G (ORCPT ); Fri, 22 Jul 2016 08:59:06 -0400 Received: from mga14.intel.com ([192.55.52.115]:7459 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754422AbcGVM5u (ORCPT ); Fri, 22 Jul 2016 08:57:50 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,405,1464678000"; d="scan'208";a="738252112" From: Tomas Winkler To: Greg Kroah-Hartman Cc: Alexander Usyskin , linux-kernel@vger.kernel.org, Tomas Winkler Subject: [char-misc-next 07/12] mei: rx flow control counter Date: Fri, 22 Jul 2016 15:56:24 +0300 Message-Id: <1469192189-29042-8-git-send-email-tomas.winkler@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1469192189-29042-1-git-send-email-tomas.winkler@intel.com> References: <1469192189-29042-1-git-send-email-tomas.winkler@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexander Usyskin Use RX flow control counter in the host client structure to track the number of simultaneous outstanding reads. This eliminates search in queues and makes ground for enabling for parallel read. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler --- drivers/misc/mei/amthif.c | 1 + drivers/misc/mei/client.c | 40 +++++++++++++--------------------------- drivers/misc/mei/mei_dev.h | 4 ++-- 3 files changed, 16 insertions(+), 29 deletions(-) diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c index 26568c5beb25..227fd5a816a6 100644 --- a/drivers/misc/mei/amthif.c +++ b/drivers/misc/mei/amthif.c @@ -202,6 +202,7 @@ static int mei_amthif_read_start(struct mei_cl *cl, const struct file *file) return -ENOMEM; list_add_tail(&cb->list, &dev->ctrl_wr_list.list); + cl->rx_flow_ctrl_creds++; dev->iamthif_state = MEI_IAMTHIF_READING; cl->fp = cb->fp; diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index 05cacc3e718f..ded11de90a26 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -735,6 +735,7 @@ void mei_cl_set_disconnected(struct mei_cl *cl) mei_io_list_flush(&dev->ctrl_wr_list, cl); mei_cl_wake_all(cl); cl->mei_flow_ctrl_creds = 0; + cl->rx_flow_ctrl_creds = 0; cl->timer_count = 0; if (!cl->me_cl) @@ -1409,25 +1410,6 @@ out: } /** - * mei_cl_is_read_fc_cb - check if read cb is waiting for flow control - * for given host client - * - * @cl: host client - * - * Return: true, if found at least one cb. - */ -static bool mei_cl_is_read_fc_cb(struct mei_cl *cl) -{ - struct mei_device *dev = cl->dev; - struct mei_cl_cb *cb; - - list_for_each_entry(cb, &dev->ctrl_wr_list.list, list) - if (cb->fop_type == MEI_FOP_READ && cb->cl == cl) - return true; - return false; -} - -/** * mei_cl_read_start - the start read client message function. * * @cl: host client @@ -1450,10 +1432,6 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp) if (!mei_cl_is_connected(cl)) return -ENODEV; - /* HW currently supports only one pending read */ - if (!list_empty(&cl->rd_pending) || mei_cl_is_read_fc_cb(cl)) - return -EBUSY; - if (!mei_me_cl_is_active(cl->me_cl)) { cl_err(dev, cl, "no such me client\n"); return -ENOTTY; @@ -1462,12 +1440,18 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp) if (mei_cl_is_fixed_address(cl)) return 0; + /* HW currently supports only one pending read */ + if (cl->rx_flow_ctrl_creds) + return -EBUSY; + /* always allocate at least client max message */ length = max_t(size_t, length, mei_cl_mtu(cl)); cb = mei_cl_alloc_cb(cl, length, MEI_FOP_READ, fp); if (!cb) return -ENOMEM; + list_add_tail(&cb->list, &dev->ctrl_wr_list.list); + rets = pm_runtime_get(dev->dev); if (rets < 0 && rets != -EINPROGRESS) { pm_runtime_put_noidle(dev->dev); @@ -1475,16 +1459,15 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length, const struct file *fp) goto nortpm; } + rets = 0; if (mei_hbuf_acquire(dev)) { rets = mei_hbm_cl_flow_control_req(dev, cl); if (rets < 0) goto out; - list_add_tail(&cb->list, &cl->rd_pending); - } else { - rets = 0; - list_add_tail(&cb->list, &dev->ctrl_wr_list.list); + list_move_tail(&cb->list, &cl->rd_pending); } + cl->rx_flow_ctrl_creds++; out: cl_dbg(dev, cl, "rpm: autosuspend\n"); @@ -1732,6 +1715,9 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb) case MEI_FOP_READ: list_add_tail(&cb->list, &cl->rd_completed); + if (!mei_cl_is_fixed_address(cl) && + !WARN_ON(!cl->rx_flow_ctrl_creds)) + cl->rx_flow_ctrl_creds--; if (!mei_cl_bus_rx_event(cl)) wake_up_interruptible(&cl->rx_wait); break; diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index aaefbc87c2fc..8bdb28054423 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -203,8 +203,8 @@ struct mei_cl_cb { * @fp: file associated with client * @host_client_id: host id * @mei_flow_ctrl_creds: transmit flow credentials + * @rx_flow_ctrl_creds: receive flow credentials * @timer_count: watchdog timer for operation completion - * @reserved: reserved for alignment * @notify_en: notification - enabled/disabled * @notify_ev: pending notification event * @writing_state: state of the tx @@ -227,8 +227,8 @@ struct mei_cl { const struct file *fp; u8 host_client_id; u8 mei_flow_ctrl_creds; + u8 rx_flow_ctrl_creds; u8 timer_count; - u8 reserved; u8 notify_en; u8 notify_ev; enum mei_file_transaction_states writing_state; -- 2.7.4