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authorMarc Zyngier <marc.zyngier@arm.com>2016-12-19 18:00:38 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2017-08-23 12:09:14 +0200
commit0d94ded2689dd836f12ba1c64520377549facbde (patch)
treec4cec5877d8f8a84dd9ced6a90fa310fe3ffbd41 /drivers/irqchip
parentgenirq: Let irq_set_vcpu_affinity() iterate over hierarchy (diff)
downloadlinux-0d94ded2689dd836f12ba1c64520377549facbde.tar.xz
linux-0d94ded2689dd836f12ba1c64520377549facbde.zip
irqchip/gic-v3: Add redistributor iterator
In order to discover the VLPI properties, we need to iterate over the redistributor regions. As we already have code that does this, let's factor it out and make it slightly more generic. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic-v3.c69
1 files changed, 47 insertions, 22 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index afae0a9d0df9..fba5f668be59 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -421,24 +421,14 @@ static void __init gic_dist_init(void)
gic_write_irouter(affinity, base + GICD_IROUTER + i * 8);
}
-static int gic_populate_rdist(void)
+static int gic_iterate_rdists(int (*fn)(struct redist_region *, void __iomem *))
{
- unsigned long mpidr = cpu_logical_map(smp_processor_id());
- u64 typer;
- u32 aff;
+ int ret = -ENODEV;
int i;
- /*
- * Convert affinity to a 32bit value that can be matched to
- * GICR_TYPER bits [63:32].
- */
- aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
- MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
- MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
- MPIDR_AFFINITY_LEVEL(mpidr, 0));
-
for (i = 0; i < gic_data.nr_redist_regions; i++) {
void __iomem *ptr = gic_data.redist_regions[i].redist_base;
+ u64 typer;
u32 reg;
reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
@@ -450,15 +440,9 @@ static int gic_populate_rdist(void)
do {
typer = gic_read_typer(ptr + GICR_TYPER);
- if ((typer >> 32) == aff) {
- u64 offset = ptr - gic_data.redist_regions[i].redist_base;
- gic_data_rdist_rd_base() = ptr;
- gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
- pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
- smp_processor_id(), mpidr, i,
- &gic_data_rdist()->phys_base);
+ ret = fn(gic_data.redist_regions + i, ptr);
+ if (!ret)
return 0;
- }
if (gic_data.redist_regions[i].single_redist)
break;
@@ -473,9 +457,50 @@ static int gic_populate_rdist(void)
} while (!(typer & GICR_TYPER_LAST));
}
+ return ret ? -ENODEV : 0;
+}
+
+static int __gic_populate_rdist(struct redist_region *region, void __iomem *ptr)
+{
+ unsigned long mpidr = cpu_logical_map(smp_processor_id());
+ u64 typer;
+ u32 aff;
+
+ /*
+ * Convert affinity to a 32bit value that can be matched to
+ * GICR_TYPER bits [63:32].
+ */
+ aff = (MPIDR_AFFINITY_LEVEL(mpidr, 3) << 24 |
+ MPIDR_AFFINITY_LEVEL(mpidr, 2) << 16 |
+ MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
+ MPIDR_AFFINITY_LEVEL(mpidr, 0));
+
+ typer = gic_read_typer(ptr + GICR_TYPER);
+ if ((typer >> 32) == aff) {
+ u64 offset = ptr - region->redist_base;
+ gic_data_rdist_rd_base() = ptr;
+ gic_data_rdist()->phys_base = region->phys_base + offset;
+
+ pr_info("CPU%d: found redistributor %lx region %d:%pa\n",
+ smp_processor_id(), mpidr,
+ (int)(region - gic_data.redist_regions),
+ &gic_data_rdist()->phys_base);
+ return 0;
+ }
+
+ /* Try next one */
+ return 1;
+}
+
+static int gic_populate_rdist(void)
+{
+ if (gic_iterate_rdists(__gic_populate_rdist) == 0)
+ return 0;
+
/* We couldn't even deal with ourselves... */
WARN(true, "CPU%d: mpidr %lx has no re-distributor!\n",
- smp_processor_id(), mpidr);
+ smp_processor_id(),
+ (unsigned long)cpu_logical_map(smp_processor_id()));
return -ENODEV;
}