From 01dae0f08dddf6ba86f956e60dceee4968f7a555 Mon Sep 17 00:00:00 2001 From: Daniel Hellstrom Date: Thu, 21 Apr 2011 04:20:24 +0000 Subject: [PATCH] sparc32,leon: operate on boot-cpu IRQ controller registers * proper initialization of boot_cpu_id (no hardcoding to 0) * use boot_cpu_id index to address into the IRQ controller where appropriate Each CPU has a separate set of IRQ controller registers, this patch makes sure that the boot-cpu registers are used instead of CPU0's. Signed-off-by: Daniel Hellstrom Signed-off-by: David S. Miller --- arch/sparc/kernel/head_32.S | 27 ++++++++++++--------------- arch/sparc/kernel/leon_kernel.c | 18 +++++++++--------- arch/sparc/kernel/leon_smp.c | 1 - 3 files changed, 21 insertions(+), 25 deletions(-) diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S index 520c615d3766..587785759838 100644 --- a/arch/sparc/kernel/head_32.S +++ b/arch/sparc/kernel/head_32.S @@ -810,27 +810,24 @@ found_version: got_prop: #ifdef CONFIG_SPARC_LEON /* no cpu-type check is needed, it is a SPARC-LEON */ -#ifdef CONFIG_SMP - ba leon_smp_init - nop - .global leon_smp_init -leon_smp_init: - /* let boot_cpu_id default to 0 (master always 0) */ + sethi %hi(boot_cpu_id), %g2 ! boot-cpu index - rd %asr17,%g1 - srl %g1,28,%g1 +#ifdef CONFIG_SMP + ldub [%g2 + %lo(boot_cpu_id)], %g1 + cmp %g1, 0xff ! unset means first CPU + bne leon_smp_cpu_startup ! continue only with master + nop +#endif + /* Get CPU-ID from most significant 4-bit of ASR17 */ + rd %asr17, %g1 + srl %g1, 28, %g1 - cmp %g0,%g1 - beq sun4c_continue_boot !continue with master - nop + /* Update boot_cpu_id only on boot cpu */ + stub %g1, [%g2 + %lo(boot_cpu_id)] - ba leon_smp_cpu_startup - nop -#else ba sun4c_continue_boot nop -#endif #endif set cputypval, %o2 ldub [%o2 + 0x4], %l1 diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c index ab1458454422..8417a914e8a3 100644 --- a/arch/sparc/kernel/leon_kernel.c +++ b/arch/sparc/kernel/leon_kernel.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "prom.h" #include "irq.h" @@ -53,7 +54,7 @@ static inline unsigned int leon_eirq_get(int cpu) static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc) { unsigned int eirq; - int cpu = hard_smp_processor_id(); + int cpu = sparc_leon3_cpuid(); eirq = leon_eirq_get(cpu); if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */ @@ -79,8 +80,8 @@ void leon_eirq_setup(unsigned int eirq) */ irq_link(veirq); mask = 1 << eirq; - oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(0)); - LEON3_BYPASS_STORE_PA(LEON_IMASK(0), (oldmask | mask)); + oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id)); + LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask)); sparc_leon_eirq = eirq; } @@ -106,12 +107,12 @@ static int irq_choose_cpu(const struct cpumask *affinity) cpus_and(mask, cpu_online_map, *affinity); if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask)) - return 0; + return boot_cpu_id; else return first_cpu(mask); } #else -#define irq_choose_cpu(affinity) 0 +#define irq_choose_cpu(affinity) boot_cpu_id #endif static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest, @@ -241,7 +242,7 @@ void __init leon_init_timers(irq_handler_t counter_fn) struct device_node *rootnp, *np, *nnp; struct property *pp; int len; - int cpu, icsel; + int icsel; int ampopts; int err; @@ -340,9 +341,8 @@ void __init leon_init_timers(irq_handler_t counter_fn) * accessed anyway. * In AMP systems, Linux must run on CPU0 for the time being. */ - cpu = sparc_leon3_cpuid(); - icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]); - icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf; + icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]); + icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf; leon3_irqctrl_regs += icsel; /* Probe extended IRQ controller */ diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c index b4059dbb6d93..cbd8e31d01ff 100644 --- a/arch/sparc/kernel/leon_smp.c +++ b/arch/sparc/kernel/leon_smp.c @@ -50,7 +50,6 @@ extern ctxd_t *srmmu_ctx_table_phys; static int smp_processors_ready; extern volatile unsigned long cpu_callin_map[NR_CPUS]; -extern unsigned char boot_cpu_id; extern cpumask_t smp_commenced_mask; void __init leon_configure_cache_smp(void); -- 2.39.5