linux-kernel - [PATCH v2 08/16] mmc: core: add preemptibility tracking fields to mmc command

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Date:	Thu, 3 May 2012 19:53:07 +0530
From:	Venkatraman S <svenkatr@...com>
To:	<linux-mmc@...r.kernel.org>, <cjb@...top.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <arnd.bergmann@...aro.org>,
	<alex.lemberg@...disk.com>, <ilan.smith@...disk.com>,
	<lporzio@...ron.com>, <rmk+kernel@....linux.org.uk>,
	Venkatraman S <svenkatr@...com>
Subject: [PATCH v2 08/16] mmc: core: add preemptibility tracking fields to mmc command

Set a preemptibility command atrribute to MMC commands. This
can be later used by write (multi block), trim etc for
evaluating if a HPI is applicable.

Note the starting time of executing a command so a decision
can be made if it is too late for preemption.

Signed-off-by: Venkatraman S <svenkatr@...com>
---
 drivers/mmc/core/core.c  |    5 +++++
 include/linux/mmc/core.h |    4 ++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index c4cd6fb..b4152ca 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -258,6 +258,11 @@ static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
 		complete(&mrq->completion);
 		return -ENOMEDIUM;
 	}
+	if (mmc_is_preemptible_command(mrq->cmd))
+		mrq->cmd->cmd_attr |= MMC_CMD_PREEMPTIBLE;
+	else
+		mrq->cmd->cmd_attr &= ~MMC_CMD_PREEMPTIBLE;
+	mrq->cmd->started_time = jiffies;
 	mmc_start_request(host, mrq);
 	return 0;
 }
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 680e256..d86144e 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -76,6 +76,10 @@ struct mmc_command {
  */
 #define mmc_cmd_type(cmd)	((cmd)->flags & MMC_CMD_MASK)
 
+	unsigned int		cmd_attr; /*Runtime attributes of the command */
+#define MMC_CMD_PREEMPTIBLE	BIT(0)
+#define MMC_CMD_PREEMPTED	BIT(1)
+	unsigned long		started_time;
 	unsigned int		retries;	/* max number of retries */
 	unsigned int		error;		/* command error */
 
-- 
1.7.10.rc2

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