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MIPS: smp-cps: Support MIPSr6 Virtual Processors

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Introduce support for bringing up Virtual Processors in MIPSr6 systems
as CPUs, much like their VPE parallel from the now-deprecated MT ASE.
The existing mips_cps_boot_vpes function fits the MIPSr6 architecture
pretty well - it can now simply write the mask of running VPs to the
VC_RUN register, rather than looping through each & starting or stopping
as appropriate as is done for VPEs from the MT ASE. Thus the VP support
is in general an extension & simplification of the existing MT ASE VPE
(aka SMVP) support.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Niklas Cassel <niklas.cassel@axis.com>
Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12339/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2016-02-03 03:15:33 +00:00
committed by Ralf Baechle
parent 87a70bcdb4
commit 5a3e7c02d8
4 changed files with 85 additions and 9 deletions
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4
arch/mips/include/asm/cpu-info.h
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@@ -68,7 +68,7 @@ struct cpuinfo_mips {
#ifdef CONFIG_64BIT
int vmbits; /* Virtual memory size in bits */
#endif
#ifdef CONFIG_MIPS_MT_SMP
#if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_CPU_MIPSR6)
/*
* There is not necessarily a 1:1 mapping of VPE num to CPU number
* in particular on multi-core systems.
@@ -125,7 +125,7 @@ struct proc_cpuinfo_notifier_args {
unsigned long n;
};
#ifdef CONFIG_MIPS_MT_SMP
#if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_CPU_MIPSR6)
# define cpu_vpe_id(cpuinfo) ((cpuinfo)->vpe_id)
#else
# define cpu_vpe_id(cpuinfo) ({ (void)cpuinfo; 0; })