Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752092Ab0KWIrr (ORCPT ); Tue, 23 Nov 2010 03:47:47 -0500 Received: from mga09.intel.com ([134.134.136.24]:47036 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751079Ab0KWIrq convert rfc822-to-8bit (ORCPT ); Tue, 23 Nov 2010 03:47:46 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,241,1288594800"; d="scan'208,223";a="680147726" Date: Tue, 23 Nov 2010 16:45:10 +0800 From: Chuanxiao Dong To: linux-mmc@vger.kernel.org, cjb@laptop.org Cc: linux-kernel@vger.kernel.org, alan@linux.intel.com, arjan@linux.intel.com, hang.yuan@intel.com Subject: [PATCH v1 4/4]use HPI to interrupt background operations Message-ID: <20101123084510.GE17754@intel.com> Reply-To: Chuanxiao Dong MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: 8BIT User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2670 Lines: 96 >From 8d2cf8e4b890a3ef0c7b63da57b8b184ab64725d Mon Sep 17 00:00:00 2001 From: Chuanxiao Dong Date: Tue, 23 Nov 2010 12:01:58 +0800 Subject: [PATCH 4/4] mmc: Add HPI operation to interrupt BKOPS Before start a new user request, driver need to wait until the BKOPS finished, or use HPI to interrupt the BKOPS since user request has a higher priority than BKOPS. This patch implemented using HPI to interrupt BKOPS if eMMC card supports HPI. Signed-off-by: Chuanxiao Dong --- drivers/mmc/core/core.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 50 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 6891169..644ce9d 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -202,6 +202,50 @@ static void mmc_wait_done(struct mmc_request *mrq) } /** + * mmc_issue_hpi_cmd - start a hpi to interrupt background + * operations + * @card: MMC card need to interrupt + * + * start MMC_SEND_STATUS/MMC_STOP_TRANSMISSION to stop the + * background operations. + * + * return value: + * 0: successfully interrupt BKOPS + * -EINVAL: HPI command invalid + * -EIO: failed when interrupt BKOPS + */ +static int mmc_issue_hpi_cmd(struct mmc_card *card) +{ + struct mmc_command cmd; + unsigned int opcode; + unsigned int flags; + int err; + + opcode = card->ext_csd.hpi_cmd; + if (opcode == MMC_STOP_TRANSMISSION) + flags = MMC_RSP_R1B | MMC_CMD_AC; + else if (opcode == MMC_SEND_STATUS) + flags = MMC_RSP_R1 | MMC_CMD_AC; + else + return -EINVAL; + + memset(&cmd, 0, sizeof(struct mmc_command)); + cmd.opcode = opcode; + cmd.arg = card->rca << 16 | 1; + err = mmc_wait_for_cmd(card->host, &cmd, 0); + if (err || (cmd.resp[0] & 0xFDF92000)) { + printk(KERN_ERR "error %d requesting status %#x\n", + err, cmd.resp[0]); + /* + * abandon this BKOPS, let block layer handle + * this + */ + return -EIO; + } + return 0; +} + +/** * mmc_wait_for_bkops- start a bkops check and wait for * completion * @card: MMC card need to check @@ -224,9 +268,14 @@ retry: if (card->ext_csd.hpi_en) { /* - * TODO * HPI to interrupt BKOPS if supported */ + err = mmc_issue_hpi_cmd(card); + if (err == -EINVAL) { + /* disable HPI feature */ + card->ext_csd.hpi_en = 0; + goto retry; + } } else { memset(&cmd, 0, sizeof(struct mmc_command)); -- 1.6.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/