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parisc: Add CPU topology support

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Add topology support, including multi-core scheduler support on
PA8800/PA8900 CPUs and enhanced output in /proc/cpuinfo, e.g.
lscpu now reports on a single-socket, dual-core machine:

Architecture:          parisc64
CPU(s):                2
On-line CPU(s) list:   0,1
Thread(s) per core:    1
Core(s) per socket:    2
Socket(s):             1
CPU family:            PA-RISC 2.0
Model name:            PA8800 (Mako)

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2017-09-21 21:55:01 +02:00
parent 05f016d2ca
commit bf7b4c1b3c
6 changed files with 200 additions and 28 deletions
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13
arch/parisc/kernel/processor.c
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@@ -184,6 +184,9 @@ static int __init processor_probe(struct parisc_device *dev)
p->txn_addr = txn_addr; /* save CPU IRQ address */
p->cpu_num = cpu_info.cpu_num;
p->cpu_loc = cpu_info.cpu_loc;
store_cpu_topology(cpuid);
#ifdef CONFIG_SMP
/*
** FIXME: review if any other initialization is clobbered
@@ -325,6 +328,8 @@ int __init init_per_cpu(int cpunum)
set_firmware_width();
ret = pdc_coproc_cfg(&coproc_cfg);
store_cpu_topology(cpunum);
if(ret >= 0 && coproc_cfg.ccr_functional) {
mtctl(coproc_cfg.ccr_functional, 10); /* 10 == Coprocessor Control Reg */
@@ -388,6 +393,14 @@ show_cpuinfo (struct seq_file *m, void *v)
boot_cpu_data.cpu_hz / 1000000,
boot_cpu_data.cpu_hz % 1000000 );
#ifdef CONFIG_PARISC_CPU_TOPOLOGY
seq_printf(m, "physical id\t: %d\n",
topology_physical_package_id(cpu));
seq_printf(m, "siblings\t: %d\n",
cpumask_weight(topology_core_cpumask(cpu)));
seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
#endif
seq_printf(m, "capabilities\t:");
if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
seq_puts(m, " os32");