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ARM: mvebu: fix HW I/O coherency related deadlocks
Until now, our understanding for HW I/O coherency to work on the Cortex-A9 based Marvell SoC was that only the PCIe regions should be mapped strongly-ordered. However, we were still encountering some deadlocks, especially when testing the CESA crypto engine. After checking with the HW designers, it was concluded that all the MMIO registers should be mapped as strongly ordered for the HW I/O coherency mechanism to work properly. This fixes some easy to reproduce deadlocks with the CESA crypto engine driver (dmcrypt on a sufficiently large disk partition). Tested-by: Terry Stockert <stockert@inkblotadmirer.me> Tested-by: Romain Perier <romain.perier@free-electrons.com> Cc: Terry Stockert <stockert@inkblotadmirer.me> Cc: Romain Perier <romain.perier@free-electrons.com> Cc: <stable@vger.kernel.org> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
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@ -162,22 +162,16 @@ exit:
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}
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/*
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* This ioremap hook is used on Armada 375/38x to ensure that PCIe
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* memory areas are mapped as MT_UNCACHED instead of MT_DEVICE. This
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* is needed as a workaround for a deadlock issue between the PCIe
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* interface and the cache controller.
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* This ioremap hook is used on Armada 375/38x to ensure that all MMIO
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* areas are mapped as MT_UNCACHED instead of MT_DEVICE. This is
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* needed for the HW I/O coherency mechanism to work properly without
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* deadlock.
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*/
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static void __iomem *
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armada_pcie_wa_ioremap_caller(phys_addr_t phys_addr, size_t size,
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unsigned int mtype, void *caller)
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armada_wa_ioremap_caller(phys_addr_t phys_addr, size_t size,
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unsigned int mtype, void *caller)
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{
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struct resource pcie_mem;
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mvebu_mbus_get_pcie_mem_aperture(&pcie_mem);
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if (pcie_mem.start <= phys_addr && (phys_addr + size) <= pcie_mem.end)
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mtype = MT_UNCACHED;
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mtype = MT_UNCACHED;
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return __arm_ioremap_caller(phys_addr, size, mtype, caller);
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}
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@ -186,7 +180,7 @@ static void __init armada_375_380_coherency_init(struct device_node *np)
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struct device_node *cache_dn;
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coherency_cpu_base = of_iomap(np, 0);
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arch_ioremap_caller = armada_pcie_wa_ioremap_caller;
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arch_ioremap_caller = armada_wa_ioremap_caller;
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/*
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* We should switch the PL310 to I/O coherency mode only if
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