Commit a42a7bb6 authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'irq-urgent-2020-03-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fix from Thomas Gleixner:
 "A single commit to handle an erratum in Cavium ThunderX to prevent
  access to GIC registers which are broken in the implementation"

* tag 'irq-urgent-2020-03-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3: Workaround Cavium erratum 38539 when reading GICD_TYPER2
parents 34d5a4b3 92c22755
......@@ -110,6 +110,8 @@ stable kernels.
+----------------+-----------------+-----------------+-----------------------------+
| Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 |
+----------------+-----------------+-----------------+-----------------------------+
| Cavium | ThunderX GICv3 | #38539 | N/A |
+----------------+-----------------+-----------------+-----------------------------+
| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 |
+----------------+-----------------+-----------------+-----------------------------+
| Cavium | ThunderX Core | #30115 | CAVIUM_ERRATUM_30115 |
......
......@@ -34,6 +34,7 @@
#define GICD_INT_NMI_PRI (GICD_INT_DEF_PRI & ~0x80)
#define FLAGS_WORKAROUND_GICR_WAKER_MSM8996 (1ULL << 0)
#define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539 (1ULL << 1)
struct redist_region {
void __iomem *redist_base;
......@@ -1464,6 +1465,15 @@ static bool gic_enable_quirk_msm8996(void *data)
return true;
}
static bool gic_enable_quirk_cavium_38539(void *data)
{
struct gic_chip_data *d = data;
d->flags |= FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539;
return true;
}
static bool gic_enable_quirk_hip06_07(void *data)
{
struct gic_chip_data *d = data;
......@@ -1502,6 +1512,19 @@ static const struct gic_quirk gic_quirks[] = {
.mask = 0xffffffff,
.init = gic_enable_quirk_hip06_07,
},
{
/*
* Reserved register accesses generate a Synchronous
* External Abort. This erratum applies to:
* - ThunderX: CN88xx
* - OCTEON TX: CN83xx, CN81xx
* - OCTEON TX2: CN93xx, CN96xx, CN98xx, CNF95xx*
*/
.desc = "GICv3: Cavium erratum 38539",
.iidr = 0xa000034c,
.mask = 0xe8f00fff,
.init = gic_enable_quirk_cavium_38539,
},
{
}
};
......@@ -1577,7 +1600,12 @@ static int __init gic_init_bases(void __iomem *dist_base,
pr_info("%d SPIs implemented\n", GIC_LINE_NR - 32);
pr_info("%d Extended SPIs implemented\n", GIC_ESPI_NR);
gic_data.rdists.gicd_typer2 = readl_relaxed(gic_data.dist_base + GICD_TYPER2);
/*
* ThunderX1 explodes on reading GICD_TYPER2, in violation of the
* architecture spec (which says that reserved registers are RES0).
*/
if (!(gic_data.flags & FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539))
gic_data.rdists.gicd_typer2 = readl_relaxed(gic_data.dist_base + GICD_TYPER2);
gic_data.domain = irq_domain_create_tree(handle, &gic_irq_domain_ops,
&gic_data);
......
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