linux-kernel - [PATCH 3/3] nvme-pci: align CMB size according to P2PMEM alignment

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Message-ID: <20210602111055.10480-4-mgurtovoy@nvidia.com>
Date:   Wed, 2 Jun 2021 14:10:55 +0300
From:   Max Gurtovoy <mgurtovoy@...dia.com>
To:     <linux-nvme@...ts.infradead.org>, <dan.j.williams@...el.com>,
        <logang@...tatee.com>, <linux-mm@...ck.org>, <hch@....de>
CC:     <sagi@...mberg.me>, <david@...hat.com>, <oren@...dia.com>,
        <linux-kernel@...r.kernel.org>, <akpm@...ux-foundation.org>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: [PATCH 3/3] nvme-pci: align CMB size according to P2PMEM alignment

P2PMEM is using mhp framework to connect to the memory subsystem. In
case the CMB size is not compatible to mhp alignment, the CMB mapping
will fail. Use pci_p2pdma_align_size to align CMB size in order to
successfully map non-aligned original CMB.

Signed-off-by: Max Gurtovoy <mgurtovoy@...dia.com>
---
 drivers/nvme/host/pci.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index a29b170701fc..1197263b4cd0 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1817,6 +1817,7 @@ static void nvme_map_cmb(struct nvme_dev *dev)
 	u64 size, offset;
 	resource_size_t bar_size;
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	unsigned long nr_pages, min_align;
 	int bar;
 
 	if (dev->cmb_size)
@@ -1856,6 +1857,12 @@ static void nvme_map_cmb(struct nvme_dev *dev)
 	if (size > bar_size - offset)
 		size = bar_size - offset;
 
+	size = pci_p2pdma_align_size(size);
+	if (!size) {
+		dev_warn(dev->ctrl.device, "CMB size is 0 after alignment\n");
+		return;
+	}
+
 	if (pci_p2pdma_add_resource(pdev, bar, size, offset)) {
 		dev_warn(dev->ctrl.device,
 			 "failed to register the CMB\n");
-- 
2.18.1