linux-kernel - [PATCH 2/2] lightnvm: enable metadata to be sent to device

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Message-Id: <1461681318-29571-2-git-send-email-javier@javigon.com>
Date:	Tue, 26 Apr 2016 16:35:17 +0200
From:	"Javier González" <jg@...htnvm.io>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	Javier González <javier@...xlabs.com>
Subject: [PATCH 2/2] lightnvm: enable metadata to be sent to device

Enable metadata to be sent to the device through the metadata field on
the physical rw nvme command. When a single ppa is sent to the device, a
64-bit integer can be sent as metadata; when a ppa list is sent, a
64-bit integer list mapping to the ppa list can be used to send
metadata.

Signed-off-by: Javier González <javier@...xlabs.com>
---
 drivers/nvme/host/lightnvm.c | 1 +
 include/linux/lightnvm.h     | 8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index 4956de3..7886c2c 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -504,6 +504,7 @@ static inline void nvme_nvm_rqtocmd(struct request *rq, struct nvm_rq *rqd,
 	c->ph_rw.opcode = rqd->opcode;
 	c->ph_rw.nsid = cpu_to_le32(ns->ns_id);
 	c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa);
+	c->ph_rw.metadata = cpu_to_le64(rqd->metadata);
 	c->ph_rw.control = cpu_to_le16(rqd->flags);
 	c->ph_rw.length = cpu_to_le16(rqd->nr_pages - 1);
 
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 208887f..f0936e3 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -237,8 +237,12 @@ struct nvm_rq {
 
 	struct ppa_addr *ppa_list;
 
-	void *metadata;
-	dma_addr_t dma_metadata;
+	union {
+		u64 metadata;
+		dma_addr_t dma_meta_list;
+	};
+
+	u64 *meta_list;
 
 	struct completion *wait;
 	nvm_end_io_fn *end_io;
-- 
2.5.0