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PCI: aardvark: Disable bus mastering when unbinding driver
Ensure that after driver unbind PCIe cards are not able to forward memory and I/O requests in the upstream direction. Link: https://lore.kernel.org/r/20211130172913.9727-7-kabel@kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Marek Behún <kabel@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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@ -1695,6 +1695,7 @@ static int advk_pcie_remove(struct platform_device *pdev)
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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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@ -1703,6 +1704,11 @@ static int advk_pcie_remove(struct platform_device *pdev)
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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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/* 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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