diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/850-v5.17-0006-PCI-aardvark-Disable-bus-mastering-when-unbinding-dr.patch')
| -rw-r--r-- | target/linux/generic/backport-5.15/850-v5.17-0006-PCI-aardvark-Disable-bus-mastering-when-unbinding-dr.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/850-v5.17-0006-PCI-aardvark-Disable-bus-mastering-when-unbinding-dr.patch b/target/linux/generic/backport-5.15/850-v5.17-0006-PCI-aardvark-Disable-bus-mastering-when-unbinding-dr.patch new file mode 100644 index 0000000000..f1c3f3bb13 --- /dev/null +++ b/target/linux/generic/backport-5.15/850-v5.17-0006-PCI-aardvark-Disable-bus-mastering-when-unbinding-dr.patch @@ -0,0 +1,41 @@ +From a46f2f6dd4093438d9615dfbf5c0fea2a9835dba Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org> +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 <pali@kernel.org> +Signed-off-by: Marek Behún <kabel@kernel.org> +Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> +--- + 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 +@@ -1696,6 +1696,7 @@ 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 */ +@@ -1704,6 +1705,11 @@ 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); |