linux-kernel - [PATCH 1/5] thunderbolt: Use 64-bit DMA mask if supported by the platform

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Date:   Mon, 18 Jun 2018 14:07:27 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Christian Kellner <christian@...lner.me>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 1/5] thunderbolt: Use 64-bit DMA mask if supported by the platform

PCI defaults to 32-bit DMA mask but this device is capable of full
64-bit addressing, so make sure we first try 64-bit DMA mask before
falling back to the default 32-bit.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/thunderbolt/nhi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index f5a33e88e676..e3b7695fe37e 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -1015,6 +1015,14 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	spin_lock_init(&nhi->lock);
 
+	res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (res)
+		res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	if (res) {
+		dev_err(&pdev->dev, "failed to set DMA mask\n");
+		return res;
+	}
+
 	pci_set_master(pdev);
 
 	tb = icm_probe(nhi);
-- 
2.17.1