Patch "ARM: mvebu: fix HW I/O coherency related deadlocks" has been added to the 4.4-stable tree

Patch "ARM: mvebu: fix HW I/O coherency related deadlocks" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ARM: mvebu: fix HW I/O coherency related deadlocks

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-mvebu-fix-hw-i-o-coherency-related-deadlocks.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c5379ba8fccd99d5f99632c789f0393d84a57805 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Thu, 16 Jun 2016 15:42:25 +0200
Subject: ARM: mvebu: fix HW I/O coherency related deadlocks

From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

commit c5379ba8fccd99d5f99632c789f0393d84a57805 upstream.

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>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/mach-mvebu/coherency.c |   22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

--- a/arch/arm/mach-mvebu/coherency.c
+++ b/arch/arm/mach-mvebu/coherency.c
@@ -162,22 +162,16 @@ exit:
 }
 
 /*
- * This ioremap hook is used on Armada 375/38x to ensure that PCIe
- * memory areas are mapped as MT_UNCACHED instead of MT_DEVICE. This
- * is needed as a workaround for a deadlock issue between the PCIe
- * interface and the cache controller.
+ * This ioremap hook is used on Armada 375/38x to ensure that all MMIO
+ * areas are mapped as MT_UNCACHED instead of MT_DEVICE. This is
+ * needed for the HW I/O coherency mechanism to work properly without
+ * deadlock.
  */
 static void __iomem *
-armada_pcie_wa_ioremap_caller(phys_addr_t phys_addr, size_t size,
-			      unsigned int mtype, void *caller)
+armada_wa_ioremap_caller(phys_addr_t phys_addr, size_t size,
+			 unsigned int mtype, void *caller)
 {
-	struct resource pcie_mem;
-
-	mvebu_mbus_get_pcie_mem_aperture(&pcie_mem);
-
-	if (pcie_mem.start <= phys_addr && (phys_addr + size) <= pcie_mem.end)
-		mtype = MT_UNCACHED;
-
+	mtype = MT_UNCACHED;
 	return __arm_ioremap_caller(phys_addr, size, mtype, caller);
 }
 
@@ -186,7 +180,7 @@ static void __init armada_375_380_cohere
 	struct device_node *cache_dn;
 
 	coherency_cpu_base = of_iomap(np, 0);
-	arch_ioremap_caller = armada_pcie_wa_ioremap_caller;
+	arch_ioremap_caller = armada_wa_ioremap_caller;
 
 	/*
 	 * We should switch the PL310 to I/O coherency mode only if


Patches currently in stable-queue which might be from thomas.petazzoni@free-electrons.com are

queue-4.4/arm-dts-armada-38x-fix-mbus_id-for-crypto-sram-on-armada-385-linksys.patch
queue-4.4/arm-mvebu-fix-hw-i-o-coherency-related-deadlocks.patch