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From:   Logan Gunthorpe <logang@deltatee.com>
To:     linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org
Cc:     Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
        Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
        Max Gurtovoy <maxg@mellanox.com>,
        Stephen Bates <sbates@raithlin.com>,
        Logan Gunthorpe <logang@deltatee.com>
Date:   Thu, 16 Jul 2020 14:33:12 -0600
Message-Id: <20200716203319.16022-3-logang@deltatee.com>
In-Reply-To: <20200716203319.16022-1-logang@deltatee.com>
References: <20200716203319.16022-1-logang@deltatee.com>
MIME-Version: 1.0
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Subject: [PATCH v15 2/9] nvme: Create helper function to obtain command effects
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Separate the code to obtain command effects from the code
to start a passthru request and open code nvme_known_admin_effects()
in the new helper.

The new helper function will be necessary for nvmet passthru
code to determine if we need to change out of interrupt context
to handle the effects.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
 drivers/nvme/host/core.c | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 63a59186e68b..80d534c5bc44 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1377,22 +1377,8 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 			metadata, meta_len, lower_32_bits(io.slba), NULL, 0);
 }
 
-static u32 nvme_known_admin_effects(u8 opcode)
-{
-	switch (opcode) {
-	case nvme_admin_format_nvm:
-		return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
-					NVME_CMD_EFFECTS_CSE_MASK;
-	case nvme_admin_sanitize_nvm:
-		return NVME_CMD_EFFECTS_CSE_MASK;
-	default:
-		break;
-	}
-	return 0;
-}
-
-static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
-								u8 opcode)
+static u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+				u8 opcode)
 {
 	u32 effects = 0;
 
@@ -1408,7 +1394,26 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 
 	if (ctrl->effects)
 		effects = le32_to_cpu(ctrl->effects->acs[opcode]);
-	effects |= nvme_known_admin_effects(opcode);
+
+	switch (opcode) {
+	case nvme_admin_format_nvm:
+		effects |= NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
+			NVME_CMD_EFFECTS_CSE_MASK;
+		break;
+	case nvme_admin_sanitize_nvm:
+		effects |= NVME_CMD_EFFECTS_CSE_MASK;
+		break;
+	default:
+		break;
+	}
+
+	return effects;
+}
+
+static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+			       u8 opcode)
+{
+	u32 effects = nvme_command_effects(ctrl, ns, opcode);
 
 	/*
 	 * For simplicity, IO to all namespaces is quiesced even if the command
-- 
2.20.1