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42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
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From a46f2f6dd4093438d9615dfbf5c0fea2a9835dba Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
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Date: Tue, 30 Nov 2021 18:29:08 +0100
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Subject: [PATCH] PCI: aardvark: Disable bus mastering when unbinding driver
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Ensure that after driver unbind PCIe cards are not able to forward
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memory and I/O requests in the upstream direction.
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Link: https://lore.kernel.org/r/20211130172913.9727-7-kabel@kernel.org
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Signed-off-by: Pali Rohár <pali@kernel.org>
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Signed-off-by: Marek Behún <kabel@kernel.org>
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Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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---
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drivers/pci/controller/pci-aardvark.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/drivers/pci/controller/pci-aardvark.c
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+++ b/drivers/pci/controller/pci-aardvark.c
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@@ -1696,6 +1696,7 @@ static int advk_pcie_remove(struct platf
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{
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struct advk_pcie *pcie = platform_get_drvdata(pdev);
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struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
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+ u32 val;
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int i;
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/* Remove PCI bus with all devices */
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@@ -1704,6 +1705,11 @@ static int advk_pcie_remove(struct platf
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pci_remove_root_bus(bridge->bus);
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pci_unlock_rescan_remove();
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+ /* Disable Root Bridge I/O space, memory space and bus mastering */
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+ val = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG);
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+ val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
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+ advk_writel(pcie, val, PCIE_CORE_CMD_STATUS_REG);
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+
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/* Remove IRQ domains */
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advk_pcie_remove_msi_irq_domain(pcie);
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advk_pcie_remove_irq_domain(pcie);
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