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Subject[PATCH 4.19 076/118] PCI: keystone: Prevent ARM32 specific code to be compiled for ARM64
Date
[ Upstream commit f316a2b53cd7f37963ae20ec7072eb27a349a4ce ]

hook_fault_code() is an ARM32 specific API for hooking into data abort.

AM65X platforms (that integrate ARM v8 cores and select CONFIG_ARM64 as
arch) rely on pci-keystone.c but on them the enumeration of a
non-present BDF does not trigger a bus error, so the fixup exception
provided by calling hook_fault_code() is not needed and can be guarded
with CONFIG_ARM.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
[lorenzo.pieralisi@arm.com: commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/controller/dwc/pci-keystone.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index e88bd221fffe..5e199e7d2d4f 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -237,6 +237,7 @@ static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie)
ks_dw_pcie_enable_error_irq(ks_pcie);
}

+#ifdef CONFIG_ARM
/*
* When a PCI device does not exist during config cycles, keystone host gets a
* bus error instead of returning 0xffffffff. This handler always returns 0
@@ -256,6 +257,7 @@ static int keystone_pcie_fault(unsigned long addr, unsigned int fsr,

return 0;
}
+#endif

static int __init ks_pcie_host_init(struct pcie_port *pp)
{
@@ -279,12 +281,14 @@ static int __init ks_pcie_host_init(struct pcie_port *pp)
val |= BIT(12);
writel(val, pci->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);

+#ifdef CONFIG_ARM
/*
* PCIe access errors that result into OCP errors are caught by ARM as
* "External aborts"
*/
hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
"Asynchronous external abort");
+#endif

return 0;
}
--
2.20.1


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