From: Michael Ellerman Date: Thu, 30 Jun 2005 05:07:09 +0000 (+1000) Subject: [PATCH] ppc64: Remove lpqueue pointer from the paca on iSeries X-Git-Tag: v2.6.13-rc2~38^2~16 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bea248fb30c3122ece8c34798527fac431c1d7b0;p=linux-2.6 [PATCH] ppc64: Remove lpqueue pointer from the paca on iSeries The iSeries code keeps a pointer to the ItLpQueue in its paca struct. But all these pointers end up pointing to the one place, ie. xItLpQueue. So remove the pointer from the paca struct and just refer to xItLpQueue directly where needed. The only complication is that the spread_lpevents logic was implemented by having a NULL lpqueue pointer in the paca on CPUs that weren't supposed to process events. Instead we just compare the spread_lpevents value to the processor id to get the same behaviour. Signed-off-by: Michael Ellerman Acked-by: Stephen Rothwell Signed-off-by: Paul Mackerras --- diff --git a/arch/ppc64/kernel/ItLpQueue.c b/arch/ppc64/kernel/ItLpQueue.c index cdea00d770..e90dca8bd1 100644 --- a/arch/ppc64/kernel/ItLpQueue.c +++ b/arch/ppc64/kernel/ItLpQueue.c @@ -69,15 +69,17 @@ struct HvLpEvent * ItLpQueue_getNextLpEvent( struct ItLpQueue * lpQueue ) return nextLpEvent; } +unsigned long spread_lpevents = 1; + int ItLpQueue_isLpIntPending( struct ItLpQueue * lpQueue ) { - int retval = 0; - struct HvLpEvent * nextLpEvent; - if ( lpQueue ) { - nextLpEvent = (struct HvLpEvent *)lpQueue->xSlicCurEventPtr; - retval = nextLpEvent->xFlags.xValid | lpQueue->xPlicOverflowIntPending; - } - return retval; + struct HvLpEvent *next_event; + + if (smp_processor_id() >= spread_lpevents) + return 0; + + next_event = (struct HvLpEvent *)lpQueue->xSlicCurEventPtr; + return next_event->xFlags.xValid | lpQueue->xPlicOverflowIntPending; } void ItLpQueue_clearValid( struct HvLpEvent * event ) diff --git a/arch/ppc64/kernel/iSeries_setup.c b/arch/ppc64/kernel/iSeries_setup.c index 86966ce76b..2049b6dbaf 100644 --- a/arch/ppc64/kernel/iSeries_setup.c +++ b/arch/ppc64/kernel/iSeries_setup.c @@ -855,17 +855,15 @@ late_initcall(iSeries_src_init); static int set_spread_lpevents(char *str) { - unsigned long i; unsigned long val = simple_strtoul(str, NULL, 0); + extern unsigned long spread_lpevents; /* * The parameter is the number of processors to share in processing * lp events. */ if (( val > 0) && (val <= NR_CPUS)) { - for (i = 1; i < val; ++i) - paca[i].lpqueue_ptr = paca[0].lpqueue_ptr; - + spread_lpevents = val; printk("lpevent processing spread over %ld processors\n", val); } else { printk("invalid spread_lpevents %ld\n", val); diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c index bdf13b4dc1..63977a7a30 100644 --- a/arch/ppc64/kernel/idle.c +++ b/arch/ppc64/kernel/idle.c @@ -88,7 +88,7 @@ static int iSeries_idle(void) while (1) { if (lpaca->lppaca.shared_proc) { - if (ItLpQueue_isLpIntPending(lpaca->lpqueue_ptr)) + if (ItLpQueue_isLpIntPending(&xItLpQueue)) process_iSeries_events(); if (!need_resched()) yield_shared_processor(); @@ -100,7 +100,7 @@ static int iSeries_idle(void) while (!need_resched()) { HMT_medium(); - if (ItLpQueue_isLpIntPending(lpaca->lpqueue_ptr)) + if (ItLpQueue_isLpIntPending(&xItLpQueue)) process_iSeries_events(); HMT_low(); } diff --git a/arch/ppc64/kernel/irq.c b/arch/ppc64/kernel/irq.c index 3defc8c33a..b1e6acb02a 100644 --- a/arch/ppc64/kernel/irq.c +++ b/arch/ppc64/kernel/irq.c @@ -269,7 +269,6 @@ out: void do_IRQ(struct pt_regs *regs) { struct paca_struct *lpaca; - struct ItLpQueue *lpq; irq_enter(); @@ -295,9 +294,8 @@ void do_IRQ(struct pt_regs *regs) iSeries_smp_message_recv(regs); } #endif /* CONFIG_SMP */ - lpq = lpaca->lpqueue_ptr; - if (lpq && ItLpQueue_isLpIntPending(lpq)) - lpevent_count += ItLpQueue_process(lpq, regs); + if (ItLpQueue_isLpIntPending(&xItLpQueue)) + lpevent_count += ItLpQueue_process(&xItLpQueue, regs); irq_exit(); diff --git a/arch/ppc64/kernel/mf.c b/arch/ppc64/kernel/mf.c index d98bebf704..d6a297a4fe 100644 --- a/arch/ppc64/kernel/mf.c +++ b/arch/ppc64/kernel/mf.c @@ -802,9 +802,8 @@ int mf_get_boot_rtc(struct rtc_time *tm) /* We need to poll here as we are not yet taking interrupts */ while (rtc_data.busy) { extern unsigned long lpevent_count; - struct ItLpQueue *lpq = get_paca()->lpqueue_ptr; - if (lpq && ItLpQueue_isLpIntPending(lpq)) - lpevent_count += ItLpQueue_process(lpq, NULL); + if (ItLpQueue_isLpIntPending(&xItLpQueue)) + lpevent_count += ItLpQueue_process(&xItLpQueue, NULL); } return rtc_set_tm(rtc_data.rc, rtc_data.ce_msg.ce_msg, tm); } diff --git a/arch/ppc64/kernel/pacaData.c b/arch/ppc64/kernel/pacaData.c index a3e0975c26..ebfb517019 100644 --- a/arch/ppc64/kernel/pacaData.c +++ b/arch/ppc64/kernel/pacaData.c @@ -45,7 +45,6 @@ extern unsigned long __toc_start; #ifdef CONFIG_PPC_ISERIES #define EXTRA_INITS(number, lpq) \ .lppaca_ptr = &paca[number].lppaca, \ - .lpqueue_ptr = (lpq), /* &xItLpQueue, */ \ .reg_save_ptr = &paca[number].reg_save, \ .reg_save = { \ .xDesc = 0xd397d9e2, /* "LpRS" */ \ diff --git a/arch/ppc64/kernel/time.c b/arch/ppc64/kernel/time.c index 2a532db913..cdc43afb56 100644 --- a/arch/ppc64/kernel/time.c +++ b/arch/ppc64/kernel/time.c @@ -367,11 +367,8 @@ int timer_interrupt(struct pt_regs * regs) set_dec(next_dec); #ifdef CONFIG_PPC_ISERIES - { - struct ItLpQueue *lpq = lpaca->lpqueue_ptr; - if (lpq && ItLpQueue_isLpIntPending(lpq)) - lpevent_count += ItLpQueue_process(lpq, regs); - } + if (ItLpQueue_isLpIntPending(&xItLpQueue)) + lpevent_count += ItLpQueue_process(&xItLpQueue, regs); #endif /* collect purr register values often, for accurate calculations */ diff --git a/include/asm-ppc64/paca.h b/include/asm-ppc64/paca.h index ae76cae148..0146f51684 100644 --- a/include/asm-ppc64/paca.h +++ b/include/asm-ppc64/paca.h @@ -20,7 +20,6 @@ #include #include #include -#include #include register struct paca_struct *local_paca asm("r13"); @@ -62,7 +61,6 @@ struct paca_struct { u16 paca_index; /* Logical processor number */ u32 default_decr; /* Default decrementer value */ - struct ItLpQueue *lpqueue_ptr; /* LpQueue handled by this CPU */ u64 kernel_toc; /* Kernel TOC address */ u64 stab_real; /* Absolute address of segment table */ u64 stab_addr; /* Virtual address of segment table */