irqchip/gicv3-its: Workaround for Cavium ThunderX errata 22375, 24313

This implements two gicv3-its errata workarounds for ThunderX. Both
with small impact affecting only ITS table allocation.

 erratum 22375: only alloc 8MB table size
 erratum 24313: ignore memory access type

The fixes are in ITS initialization and basically ignore memory access
type and table size provided by the TYPER and BASER registers.

Signed-off-by: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Reviewed-by: Marc Zygnier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Tirumalesh Chalamarla <tchalamarla@cavium.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1442869119-1814-6-git-send-email-rric@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 490df44..440d906 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -348,6 +348,23 @@ config ARM64_ERRATUM_843419
 
          If unsure, say Y.
 
+config CAVIUM_ERRATUM_22375
+       bool "Cavium erratum 22375, 24313"
+       default y
+       help
+         Enable workaround for erratum 22375, 24313.
+
+         This implements two gicv3-its errata workarounds for ThunderX. Both
+         with small impact affecting only ITS table allocation.
+
+           erratum 22375: only alloc 8MB table size
+           erratum 24313: ignore memory access type
+
+         The fixes are in ITS initialization and basically ignore memory access
+         type and table size provided by the TYPER and BASER registers.
+
+         If unsure, say Y.
+
 config CAVIUM_ERRATUM_23154
        bool "Cavium erratum 23154: Access to ICC_IAR1_EL1 is not sync'ed"
        default y

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 82622af..eac44dd 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -39,7 +39,8 @@
 
 #include "irq-gic-common.h"
 
-#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING          (1 << 0)
+#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING          (1ULL << 0)
+#define ITS_FLAGS_WORKAROUND_CAVIUM_22375      (1ULL << 1)
 
 #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING    (1 << 0)
 
@@ -816,9 +817,22 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
        int i;
        int psz = SZ_64K;
        u64 shr = GITS_BASER_InnerShareable;
-       u64 cache = GITS_BASER_WaWb;
-       u64 typer = readq_relaxed(its->base + GITS_TYPER);
-       u32 ids = GITS_TYPER_DEVBITS(typer);
+       u64 cache;
+       u64 typer;
+       u32 ids;
+
+       if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_22375) {
+               /*
+                * erratum 22375: only alloc 8MB table size
+                * erratum 24313: ignore memory access type
+                */
+               cache   = 0;
+               ids     = 0x14;                 /* 20 bits, 8MB */
+       } else {
+               cache   = GITS_BASER_WaWb;
+               typer   = readq_relaxed(its->base + GITS_TYPER);
+               ids     = GITS_TYPER_DEVBITS(typer);
+       }
 
        for (i = 0; i < GITS_BASER_NR_REGS; i++) {
                u64 val = readq_relaxed(its->base + GITS_BASER + i * 8);
@@ -1377,7 +1391,22 @@ static int its_force_quiescent(void __iomem *base)
        }
 }
 
+static void __maybe_unused its_enable_quirk_cavium_22375(void *data)
+{
+       struct its_node *its = data;
+
+       its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_22375;
+}
+
 static const struct gic_quirk its_quirks[] = {
+#ifdef CONFIG_CAVIUM_ERRATUM_22375
+       {
+               .desc   = "ITS: Cavium errata 22375, 24313",
+               .iidr   = 0xa100034c,   /* ThunderX pass 1.x */
+               .mask   = 0xffff0fff,
+               .init   = its_enable_quirk_cavium_22375,
+       },
+#endif
        {
        }
 };