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| author |   Nicolas Pitre <nicolas.pitre@linaro.org> | 2012-07-05 21:33:26 -0400 |
|---|---|---|
| committer | Nicolas Pitre <nicolas.pitre@linaro.org> | 2013-07-30 09:02:16 -0400 |
| commit | ed96762e3241f57aa812977cf1920d3ee0363f4d (patch) | |
| tree | 18849feb3008c15c4affc370119821a4b1c72458 /arch/arm/common | |
| parent | ARM: bL_switcher: hot-unplug half of the available CPUs (diff) | |
| download | linux-dev-ed96762e3241f57aa812977cf1920d3ee0363f4d.tar.xz linux-dev-ed96762e3241f57aa812977cf1920d3ee0363f4d.zip | |
ARM: bL_switcher: do not hardcode GIC IDs in the code
Currently, GIC IDs are hardcoded making the code dependent on the 4+4 b.L
configuration. Let's allow for GIC IDs to be discovered upon switcher
initialization to support other b.L configurations such as the 1+1 one,
or 2+3 as on the VExpress TC2.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'arch/arm/common')
| -rw-r--r-- | arch/arm/common/bL_switcher.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c index 50e95d894e35..1c2e5bcfb1f7 100644 --- a/arch/arm/common/bL_switcher.c +++ b/arch/arm/common/bL_switcher.c @@ -110,6 +110,8 @@ static int bL_switchpoint(unsigned long _arg) * Generic switcher interface */ +static unsigned int bL_gic_id[MAX_CPUS_PER_CLUSTER][MAX_NR_CLUSTERS]; + /* * bL_switch_to - Switch to a specific cluster for the current CPU * @new_cluster_id: the ID of the cluster to switch to. @@ -159,7 +161,7 @@ static int bL_switch_to(unsigned int new_cluster_id) this_cpu = smp_processor_id(); /* redirect GIC's SGIs to our counterpart */ - gic_migrate_target(cpuid + ib_cluster*4); + gic_migrate_target(bL_gic_id[cpuid][ib_cluster]); /* * Raise a SGI on the inbound CPU to make sure it doesn't stall @@ -332,6 +334,16 @@ static int __init bL_switcher_halve_cpus(void) cluster = (cpu_logical_map(i) >> 8) & 0xff; if (cpumask_test_cpu(cpu, &common_mask)) { + /* Let's take note of the GIC ID for this CPU */ + int gic_id = gic_get_cpu_id(i); + if (gic_id < 0) { + pr_err("%s: bad GIC ID for CPU %d\n", __func__, i); + return -EINVAL; + } + bL_gic_id[cpu][cluster] = gic_id; + pr_info("GIC ID for CPU %u cluster %u is %u\n", + cpu, cluster, gic_id); + /* * We keep only those logical CPUs which number * is equal to their physical CPU number. This is |