From a46f2f6dd4093438d9615dfbf5c0fea2a9835dba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= Date: Tue, 30 Nov 2021 18:29:08 +0100 Subject: [PATCH] PCI: aardvark: Disable bus mastering when unbinding driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Marek Behún Signed-off-by: Lorenzo Pieralisi --- drivers/pci/controller/pci-aardvark.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -1686,6 +1686,7 @@ static int advk_pcie_remove(struct platf { struct advk_pcie *pcie = platform_get_drvdata(pdev); struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie); + u32 val; int i; /* Remove PCI bus with all devices */ @@ -1694,6 +1695,11 @@ static int advk_pcie_remove(struct platf pci_remove_root_bus(bridge->bus); pci_unlock_rescan_remove(); + /* Disable Root Bridge I/O space, memory space and bus mastering */ + val = advk_readl(pcie, PCIE_CORE_CMD_STATUS_REG); + val &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); + advk_writel(pcie, val, PCIE_CORE_CMD_STATUS_REG); + /* Remove IRQ domains */ advk_pcie_remove_msi_irq_domain(pcie); advk_pcie_remove_irq_domain(pcie);