linux-kernel - [PATCH 11/13] mpt3sas: set virt_boundary

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Message-Id: <20190605190836.32354-12-hch@lst.de>
Date:   Wed,  5 Jun 2019 21:08:34 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Sebastian Ott <sebott@...ux.ibm.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Max Gurtovoy <maxg@...lanox.com>,
        Bart Van Assche <bvanassche@....org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Oliver Neukum <oneukum@...e.com>, linux-block@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        megaraidlinux.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com,
        linux-hyperv@...r.kernel.org, linux-usb@...r.kernel.org,
        usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: [PATCH 11/13] mpt3sas: set virt_boundary_mask in the scsi host

This ensures all proper DMA layer handling is taken care of by the
SCSI midlayer.  Note that the effect is global, as the IOMMU merging
is based off a paramters in struct device.  We could still turn if off
if no PCIe devices are present, but I don't know how to find that out.

Also remove the bogus nomerges flag, merges do take the virt_boundary
into account.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 1ccfbc7eebe0..03a0df2a3379 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -2361,14 +2361,6 @@ scsih_slave_configure(struct scsi_device *sdev)
 		pcie_device_put(pcie_device);
 		spin_unlock_irqrestore(&ioc->pcie_device_lock, flags);
 		scsih_change_queue_depth(sdev, qdepth);
-		/* Enable QUEUE_FLAG_NOMERGES flag, so that IOs won't be
-		 ** merged and can eliminate holes created during merging
-		 ** operation.
-		 **/
-		blk_queue_flag_set(QUEUE_FLAG_NOMERGES,
-				sdev->request_queue);
-		blk_queue_virt_boundary(sdev->request_queue,
-				ioc->page_size - 1);
 		return 0;
 	}
 
@@ -10472,6 +10464,9 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	shost->transportt = mpt3sas_transport_template;
 	shost->unique_id = ioc->id;
 
+	/* XXX: only strictly needed if NVMe devices are attached */
+	shost->virt_boundary_mask = ioc->page_size - 1;
+
 	if (ioc->is_mcpu_endpoint) {
 		/* mCPU MPI support 64K max IO */
 		shost->max_sectors = 128;
-- 
2.20.1