linux-kernel - [RFC PATCH 06/11] mmc: core: Helper function for finding preemptible command

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Date:	Wed, 18 Apr 2012 11:55:27 +0530
From:	Venkatraman S <svenkatr@...com>
To:	<linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
CC:	<arnd.bergmann@...aro.org>, <cjb@...top.org>,
	<alex.limberg@...disk.com>, <ilan.smith@...disk.com>,
	<lporzio@...ron.com>, Venkatraman S <svenkatr@...com>
Subject: [RFC PATCH 06/11] mmc: core: Helper function for finding preemptible command

According to Table 30 in eMMC spec, only some commands
can be preempted by HPI. Provide a helper function for
the HPI procedure to identify if the command is
preemptible.

Signed-off-by: Venkatraman S <svenkatr@...com>
---
 include/linux/mmc/core.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 1b431c7..680e256 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -10,6 +10,7 @@
 
 #include <linux/interrupt.h>
 #include <linux/completion.h>
+#include <linux/mmc/mmc.h>
 
 struct request;
 struct mmc_data;
@@ -192,6 +193,18 @@ static inline void mmc_claim_host(struct mmc_host *host)
 	__mmc_claim_host(host, NULL);
 }
 
+static inline bool mmc_is_preemptible_command(struct mmc_command *cmd)
+{
+	if ((cmd->opcode == MMC_SWITCH && (cmd->arg == EXT_CSD_BKOPS_START ||
+		cmd->arg == EXT_CSD_SANITIZE_START ||
+		cmd->arg == EXT_CSD_FLUSH_CACHE))
+		|| (cmd->opcode == MMC_ERASE)
+		|| (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK)
+		|| (cmd->opcode == MMC_WRITE_BLOCK))
+		return true;
+	return false;
+}
+
 extern u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max);
 
 #endif /* LINUX_MMC_CORE_H */
-- 
1.7.10.rc2

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