Differential D25510 Diff 74350 sys/i386/i386/mp_machdep.c

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sys/i386/i386/mp_machdep.c

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#include <sys/param.h>		#include <sys/param.h>
#include <sys/systm.h>		#include <sys/systm.h>
#include <sys/bus.h>		#include <sys/bus.h>
#include <sys/cons.h> /* cngetc() */		#include <sys/cons.h> /* cngetc() */
#include <sys/cpuset.h>		#include <sys/cpuset.h>
#ifdef GPROF		#ifdef GPROF
#include <sys/gmon.h>		#include <sys/gmon.h>
#endif		#endif
		#include <sys/kdb.h>
#include <sys/kernel.h>		#include <sys/kernel.h>
#include <sys/ktr.h>		#include <sys/ktr.h>
#include <sys/lock.h>		#include <sys/lock.h>
#include <sys/malloc.h>		#include <sys/malloc.h>
#include <sys/memrange.h>		#include <sys/memrange.h>
#include <sys/mutex.h>		#include <sys/mutex.h>
#include <sys/pcpu.h>		#include <sys/pcpu.h>
#include <sys/proc.h>		#include <sys/proc.h>
▲ Show 20 Lines • Show All 396 Lines • ▼ Show 20 Lines	start_ap(int apic_id)

/* Wait up to 5 seconds for it to start. */		/* Wait up to 5 seconds for it to start. */
for (ms = 0; ms < 5000; ms++) {		for (ms = 0; ms < 5000; ms++) {
if (mp_naps > cpus)		if (mp_naps > cpus)
return 1; /* return SUCCESS */		return 1; /* return SUCCESS */
DELAY(1000);		DELAY(1000);
}		}
return 0; /* return FAILURE */		return 0; /* return FAILURE */
		}

		/*
		* Flush the TLB on other CPU's
		*/

		/* Variables needed for SMP tlb shootdown. */
		vm_offset_t smp_tlb_addr1, smp_tlb_addr2;
		pmap_t smp_tlb_pmap;
		volatile uint32_t smp_tlb_generation;

		/*
		* Used by pmap to request cache or TLB invalidation on local and
		* remote processors. Mask provides the set of remote CPUs which are
		* to be signalled with the invalidation IPI, specified by vector. As
		* an optimization, the curcpu_cb callback is invoked on the calling
		* CPU while waiting for remote CPUs to complete the operation.
		alcUnsubmitted Done Inline Actions See earlier comments under amd64. alc: See earlier comments under amd64.
		*
		* The callback function is called unconditionally on the caller's
		* underlying processor, even when this processor is not set in the
		* mask. So, the callback function must be prepared to handle such
		* spurious invocations.
		*/
		static void
		smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, pmap_t pmap,
		vm_offset_t addr1, vm_offset_t addr2, smp_invl_cb_t curcpu_cb)
		{
		cpuset_t other_cpus;
		volatile uint32_t *p_cpudone;
		uint32_t generation;
		int cpu;

		/*
		* It is not necessary to signal other CPUs while booting or
		* when in the debugger.
		*/
		if (kdb_active \|\| KERNEL_PANICKED() \|\| !smp_started) {
		curcpu_cb(pmap, addr1, addr2);
		return;
		}

		sched_pin();

		/*
		* Check for other cpus. Return if none.
		*/
		if (CPU_ISFULLSET(&mask)) {
		if (mp_ncpus <= 1)
		goto nospinexit;
		} else {
		CPU_CLR(PCPU_GET(cpuid), &mask);
		if (CPU_EMPTY(&mask))
		goto nospinexit;
		}

		KASSERT((read_eflags() & PSL_I) != 0,
		("smp_targeted_tlb_shootdown: interrupts disabled"));
		mtx_lock_spin(&smp_ipi_mtx);
		smp_tlb_addr1 = addr1;
		smp_tlb_addr2 = addr2;
		smp_tlb_pmap = pmap;
		generation = ++smp_tlb_generation;
		if (CPU_ISFULLSET(&mask)) {
		ipi_all_but_self(vector);
		other_cpus = all_cpus;
		CPU_CLR(PCPU_GET(cpuid), &other_cpus);
		} else {
		other_cpus = mask;
		while ((cpu = CPU_FFS(&mask)) != 0) {
		cpu--;
		CPU_CLR(cpu, &mask);
		CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__,
		cpu, vector);
		ipi_send_cpu(cpu, vector);
		}
		}
		curcpu_cb(pmap, addr1, addr2);
		while ((cpu = CPU_FFS(&other_cpus)) != 0) {
		cpu--;
		CPU_CLR(cpu, &other_cpus);
		p_cpudone = &cpuid_to_pcpu[cpu]->pc_smp_tlb_done;
		while (*p_cpudone != generation)
		ia32_pause();
		}
		mtx_unlock_spin(&smp_ipi_mtx);
		sched_unpin();
		return;

		nospinexit:
		curcpu_cb(pmap, addr1, addr2);
		sched_unpin();
		}

		void
		smp_masked_invltlb(cpuset_t mask, pmap_t pmap, smp_invl_cb_t curcpu_cb)
		{
		smp_targeted_tlb_shootdown(mask, IPI_INVLTLB, pmap, 0, 0, curcpu_cb);
		#ifdef COUNT_XINVLTLB_HITS
		ipi_global++;
		#endif
		}

		void
		smp_masked_invlpg(cpuset_t mask, vm_offset_t addr, pmap_t pmap,
		smp_invl_cb_t curcpu_cb)
		{
		smp_targeted_tlb_shootdown(mask, IPI_INVLPG, pmap, addr, 0, curcpu_cb);
		#ifdef COUNT_XINVLTLB_HITS
		ipi_page++;
		#endif
		}

		void
		smp_masked_invlpg_range(cpuset_t mask, vm_offset_t addr1, vm_offset_t addr2,
		pmap_t pmap, smp_invl_cb_t curcpu_cb)
		{
		smp_targeted_tlb_shootdown(mask, IPI_INVLRNG, pmap, addr1, addr2,
		curcpu_cb);
		#ifdef COUNT_XINVLTLB_HITS
		ipi_range++;
		ipi_range_size += (addr2 - addr1) / PAGE_SIZE;
		#endif
		}

		void
		smp_cache_flush(smp_invl_cb_t curcpu_cb)
		{
		smp_targeted_tlb_shootdown(all_cpus, IPI_INVLCACHE, NULL, 0, 0,
		curcpu_cb);
		}

		alcUnsubmitted Done Inline Actions This blank line is no longer required. alc: This blank line is no longer required.
		/*
		* Handlers for TLB related IPIs
		*/
		void
		invltlb_handler(void)
		{
		uint32_t generation;

		#ifdef COUNT_XINVLTLB_HITS
		xhits_gbl[PCPU_GET(cpuid)]++;
		#endif /* COUNT_XINVLTLB_HITS */
		#ifdef COUNT_IPIS
		(*ipi_invltlb_counts[PCPU_GET(cpuid)])++;
		#endif /* COUNT_IPIS */

		/*
		* Reading the generation here allows greater parallelism
		* since invalidating the TLB is a serializing operation.
		*/
		generation = smp_tlb_generation;
		if (smp_tlb_pmap == kernel_pmap)
		invltlb_glob();
		PCPU_SET(smp_tlb_done, generation);
		}

		void
		invlpg_handler(void)
		{
		uint32_t generation;

		alcUnsubmitted Done Inline Actions Dead code? alc: Dead code?
		#ifdef COUNT_XINVLTLB_HITS
		xhits_pg[PCPU_GET(cpuid)]++;
		#endif /* COUNT_XINVLTLB_HITS */
		#ifdef COUNT_IPIS
		(*ipi_invlpg_counts[PCPU_GET(cpuid)])++;
		#endif /* COUNT_IPIS */

		generation = smp_tlb_generation; /* Overlap with serialization */
		if (smp_tlb_pmap == kernel_pmap)
		invlpg(smp_tlb_addr1);
		PCPU_SET(smp_tlb_done, generation);
		}

		void
		invlrng_handler(void)
		{
		vm_offset_t addr, addr2;
		alcUnsubmitted Done Inline Actions Redundant? alc: Redundant?
		uint32_t generation;

		#ifdef COUNT_XINVLTLB_HITS
		xhits_rng[PCPU_GET(cpuid)]++;
		#endif /* COUNT_XINVLTLB_HITS */
		#ifdef COUNT_IPIS
		(*ipi_invlrng_counts[PCPU_GET(cpuid)])++;
		#endif /* COUNT_IPIS */

		addr = smp_tlb_addr1;
		addr2 = smp_tlb_addr2;
		generation = smp_tlb_generation; /* Overlap with serialization */
		if (smp_tlb_pmap == kernel_pmap) {
		do {
		invlpg(addr);
		addr += PAGE_SIZE;
		} while (addr < addr2);
		}

		PCPU_SET(smp_tlb_done, generation);
		}

		void
		alcUnsubmitted Done Inline Actions Redundant? alc: Redundant?
		invlcache_handler(void)
		{
		uint32_t generation;

		#ifdef COUNT_IPIS
		(*ipi_invlcache_counts[PCPU_GET(cpuid)])++;
		#endif /* COUNT_IPIS */

		/*
		* Reading the generation here allows greater parallelism
		* since wbinvd is a serializing instruction. Without the
		* temporary, we'd wait for wbinvd to complete, then the read
		* would execute, then the dependent write, which must then
		* complete before return from interrupt.
		*/
		generation = smp_tlb_generation;
		wbinvd();
		PCPU_SET(smp_tlb_done, generation);
}		}