linux-kernel - [PATCH v5 08/12] PCI: endpoint: Handle 64-bit BARs properly

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Message-Id: <20180328115018.31921-9-niklas.cassel@axis.com>
Date:   Wed, 28 Mar 2018 13:50:13 +0200
From:   Niklas Cassel <niklas.cassel@...s.com>
To:     kishon@...com, cyrille.pitchen@...e-electrons.com,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sekhar Nori <nsekhar@...com>, John Keeping <john@...anate.com>,
        Niklas Cassel <niklass@...s.com>,
        Shawn Lin <shawn.lin@...k-chips.com>
Cc:     Niklas Cassel <niklass@...s.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 08/12] PCI: endpoint: Handle 64-bit BARs properly

If a 64-bit BAR was set-up, we need to skip a BAR,
since a 64-bit BAR consists of a BAR pair.

We need to check what BAR width the epc->ops->set_bar() specific
implementation actually did set-up, since some drivers, like the
Cadence EP controller, sometimes sets up a 64-bit BAR, even though
a 32-bit BAR was requested.

Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
---
 drivers/pci/endpoint/functions/pci-epf-test.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 91274779e59f..d46e3ebabb8e 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -380,6 +380,13 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
 			if (bar == test_reg_bar)
 				return ret;
 		}
+		/*
+		 * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
+		 * if the specific implementation required a 64-bit BAR,
+		 * even if we only requested a 32-bit BAR.
+		 */
+		if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
+			bar++;
 	}
 
 	return 0;
-- 
2.14.2