dd78a731a2
between the beginning of the idle function and actually going idle, the CPU could go to sleep with pending work. MFC after: 1 month
529 lines
13 KiB
C
529 lines
13 KiB
C
/*-
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* Copyright (c) 2008 Marcel Moolenaar
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* Copyright (c) 2009 Nathan Whitehorn
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/hid.h>
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#include <machine/platformvar.h>
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#include <machine/rtas.h>
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#include <machine/smp.h>
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#include <machine/spr.h>
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#include <machine/trap.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/ofw_machdep.h>
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#include "platform_if.h"
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#ifdef SMP
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extern void *ap_pcpu;
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#endif
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#ifdef __powerpc64__
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static uint8_t splpar_vpa[MAXCPU][640] __aligned(128); /* XXX: dpcpu */
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#endif
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static vm_offset_t realmaxaddr = VM_MAX_ADDRESS;
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static int chrp_probe(platform_t);
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static int chrp_attach(platform_t);
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void chrp_mem_regions(platform_t, struct mem_region *phys, int *physsz,
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struct mem_region *avail, int *availsz);
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static vm_offset_t chrp_real_maxaddr(platform_t);
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static u_long chrp_timebase_freq(platform_t, struct cpuref *cpuref);
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static int chrp_smp_first_cpu(platform_t, struct cpuref *cpuref);
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static int chrp_smp_next_cpu(platform_t, struct cpuref *cpuref);
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static int chrp_smp_get_bsp(platform_t, struct cpuref *cpuref);
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static void chrp_smp_ap_init(platform_t);
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#ifdef SMP
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static int chrp_smp_start_cpu(platform_t, struct pcpu *cpu);
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static struct cpu_group *chrp_smp_topo(platform_t plat);
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#endif
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static void chrp_reset(platform_t);
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#ifdef __powerpc64__
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#include "phyp-hvcall.h"
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static void phyp_cpu_idle(sbintime_t sbt);
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#endif
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static platform_method_t chrp_methods[] = {
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PLATFORMMETHOD(platform_probe, chrp_probe),
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PLATFORMMETHOD(platform_attach, chrp_attach),
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PLATFORMMETHOD(platform_mem_regions, chrp_mem_regions),
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PLATFORMMETHOD(platform_real_maxaddr, chrp_real_maxaddr),
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PLATFORMMETHOD(platform_timebase_freq, chrp_timebase_freq),
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PLATFORMMETHOD(platform_smp_ap_init, chrp_smp_ap_init),
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PLATFORMMETHOD(platform_smp_first_cpu, chrp_smp_first_cpu),
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PLATFORMMETHOD(platform_smp_next_cpu, chrp_smp_next_cpu),
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PLATFORMMETHOD(platform_smp_get_bsp, chrp_smp_get_bsp),
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#ifdef SMP
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PLATFORMMETHOD(platform_smp_start_cpu, chrp_smp_start_cpu),
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PLATFORMMETHOD(platform_smp_topo, chrp_smp_topo),
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#endif
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PLATFORMMETHOD(platform_reset, chrp_reset),
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{ 0, 0 }
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};
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static platform_def_t chrp_platform = {
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"chrp",
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chrp_methods,
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0
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};
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PLATFORM_DEF(chrp_platform);
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static int
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chrp_probe(platform_t plat)
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{
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if (OF_finddevice("/memory") != -1 || OF_finddevice("/memory@0") != -1)
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return (BUS_PROBE_GENERIC);
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return (ENXIO);
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}
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static int
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chrp_attach(platform_t plat)
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{
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#ifdef __powerpc64__
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int i;
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/* XXX: check for /rtas/ibm,hypertas-functions? */
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if (!(mfmsr() & PSL_HV)) {
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struct mem_region *phys, *avail;
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int nphys, navail;
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mem_regions(&phys, &nphys, &avail, &navail);
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realmaxaddr = phys[0].mr_size;
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pmap_mmu_install("mmu_phyp", BUS_PROBE_SPECIFIC);
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cpu_idle_hook = phyp_cpu_idle;
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/* Set up important VPA fields */
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for (i = 0; i < MAXCPU; i++) {
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bzero(splpar_vpa[i], sizeof(splpar_vpa));
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/* First two: VPA size */
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splpar_vpa[i][4] =
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(uint8_t)((sizeof(splpar_vpa[i]) >> 8) & 0xff);
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splpar_vpa[i][5] =
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(uint8_t)(sizeof(splpar_vpa[i]) & 0xff);
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splpar_vpa[i][0xba] = 1; /* Maintain FPRs */
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splpar_vpa[i][0xbb] = 1; /* Maintain PMCs */
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splpar_vpa[i][0xfc] = 0xff; /* Maintain full SLB */
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splpar_vpa[i][0xfd] = 0xff;
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splpar_vpa[i][0xff] = 1; /* Maintain Altivec */
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}
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mb();
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/* Set up hypervisor CPU stuff */
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chrp_smp_ap_init(plat);
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}
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#endif
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/* Some systems (e.g. QEMU) need Open Firmware to stand down */
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ofw_quiesce();
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return (0);
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}
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static int
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parse_drconf_memory(struct mem_region *ofmem, int *msz,
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struct mem_region *ofavail, int *asz)
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{
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phandle_t phandle;
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vm_offset_t base;
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int i, idx, len, lasz, lmsz, res;
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uint32_t flags, lmb_size[2];
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uint32_t *dmem;
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lmsz = *msz;
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lasz = *asz;
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phandle = OF_finddevice("/ibm,dynamic-reconfiguration-memory");
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if (phandle == -1)
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/* No drconf node, return. */
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return (0);
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res = OF_getencprop(phandle, "ibm,lmb-size", lmb_size,
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sizeof(lmb_size));
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if (res == -1)
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return (0);
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printf("Logical Memory Block size: %d MB\n", lmb_size[1] >> 20);
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/* Parse the /ibm,dynamic-memory.
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The first position gives the # of entries. The next two words
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reflect the address of the memory block. The next four words are
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the DRC index, reserved, list index and flags.
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(see PAPR C.6.6.2 ibm,dynamic-reconfiguration-memory)
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#el Addr DRC-idx res list-idx flags
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-------------------------------------------------
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| 4 | 8 | 4 | 4 | 4 | 4 |....
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-------------------------------------------------
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*/
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len = OF_getproplen(phandle, "ibm,dynamic-memory");
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if (len > 0) {
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/* We have to use a variable length array on the stack
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since we have very limited stack space.
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*/
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cell_t arr[len/sizeof(cell_t)];
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res = OF_getencprop(phandle, "ibm,dynamic-memory", arr,
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sizeof(arr));
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if (res == -1)
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return (0);
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/* Number of elements */
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idx = arr[0];
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/* First address, in arr[1], arr[2]*/
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dmem = &arr[1];
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for (i = 0; i < idx; i++) {
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base = ((uint64_t)dmem[0] << 32) + dmem[1];
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dmem += 4;
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flags = dmem[1];
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/* Use region only if available and not reserved. */
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if ((flags & 0x8) && !(flags & 0x80)) {
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ofmem[lmsz].mr_start = base;
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ofmem[lmsz].mr_size = (vm_size_t)lmb_size[1];
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ofavail[lasz].mr_start = base;
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ofavail[lasz].mr_size = (vm_size_t)lmb_size[1];
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lmsz++;
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lasz++;
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}
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dmem += 2;
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}
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}
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*msz = lmsz;
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*asz = lasz;
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return (1);
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}
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void
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chrp_mem_regions(platform_t plat, struct mem_region *phys, int *physsz,
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struct mem_region *avail, int *availsz)
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{
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vm_offset_t maxphysaddr;
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int i;
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ofw_mem_regions(phys, physsz, avail, availsz);
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parse_drconf_memory(phys, physsz, avail, availsz);
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/*
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* On some firmwares (SLOF), some memory may be marked available that
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* doesn't actually exist. This manifests as an extension of the last
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* available segment past the end of physical memory, so truncate that
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* one.
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*/
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maxphysaddr = 0;
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for (i = 0; i < *physsz; i++)
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if (phys[i].mr_start + phys[i].mr_size > maxphysaddr)
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maxphysaddr = phys[i].mr_start + phys[i].mr_size;
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for (i = 0; i < *availsz; i++)
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if (avail[i].mr_start + avail[i].mr_size > maxphysaddr)
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avail[i].mr_size = maxphysaddr - avail[i].mr_start;
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}
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static vm_offset_t
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chrp_real_maxaddr(platform_t plat)
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{
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return (realmaxaddr);
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}
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static u_long
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chrp_timebase_freq(platform_t plat, struct cpuref *cpuref)
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{
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phandle_t phandle;
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int32_t ticks = -1;
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phandle = cpuref->cr_hwref;
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OF_getencprop(phandle, "timebase-frequency", &ticks, sizeof(ticks));
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if (ticks <= 0)
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panic("Unable to determine timebase frequency!");
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return (ticks);
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}
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static int
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chrp_smp_first_cpu(platform_t plat, struct cpuref *cpuref)
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{
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char buf[8];
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phandle_t cpu, dev, root;
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int res, cpuid;
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root = OF_peer(0);
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dev = OF_child(root);
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while (dev != 0) {
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res = OF_getprop(dev, "name", buf, sizeof(buf));
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if (res > 0 && strcmp(buf, "cpus") == 0)
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break;
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dev = OF_peer(dev);
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}
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if (dev == 0) {
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/*
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* psim doesn't have a name property on the /cpus node,
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* but it can be found directly
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*/
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dev = OF_finddevice("/cpus");
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if (dev == 0)
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return (ENOENT);
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}
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cpu = OF_child(dev);
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while (cpu != 0) {
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res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
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if (res > 0 && strcmp(buf, "cpu") == 0)
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break;
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cpu = OF_peer(cpu);
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}
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if (cpu == 0)
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return (ENOENT);
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cpuref->cr_hwref = cpu;
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res = OF_getencprop(cpu, "ibm,ppc-interrupt-server#s", &cpuid,
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sizeof(cpuid));
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if (res <= 0)
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res = OF_getencprop(cpu, "reg", &cpuid, sizeof(cpuid));
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if (res <= 0)
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cpuid = 0;
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cpuref->cr_cpuid = cpuid;
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return (0);
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}
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static int
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chrp_smp_next_cpu(platform_t plat, struct cpuref *cpuref)
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{
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char buf[8];
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phandle_t cpu;
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int i, res, cpuid;
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/* Check for whether it should be the next thread */
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res = OF_getproplen(cpuref->cr_hwref, "ibm,ppc-interrupt-server#s");
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if (res > 0) {
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cell_t interrupt_servers[res/sizeof(cell_t)];
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OF_getencprop(cpuref->cr_hwref, "ibm,ppc-interrupt-server#s",
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interrupt_servers, res);
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for (i = 0; i < res/sizeof(cell_t) - 1; i++) {
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if (interrupt_servers[i] == cpuref->cr_cpuid) {
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cpuref->cr_cpuid = interrupt_servers[i+1];
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return (0);
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}
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}
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}
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/* Next CPU core/package */
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cpu = OF_peer(cpuref->cr_hwref);
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while (cpu != 0) {
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res = OF_getprop(cpu, "device_type", buf, sizeof(buf));
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if (res > 0 && strcmp(buf, "cpu") == 0)
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break;
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cpu = OF_peer(cpu);
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}
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if (cpu == 0)
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return (ENOENT);
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cpuref->cr_hwref = cpu;
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res = OF_getencprop(cpu, "ibm,ppc-interrupt-server#s", &cpuid,
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sizeof(cpuid));
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if (res <= 0)
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res = OF_getencprop(cpu, "reg", &cpuid, sizeof(cpuid));
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if (res <= 0)
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cpuid = 0;
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cpuref->cr_cpuid = cpuid;
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return (0);
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}
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static int
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chrp_smp_get_bsp(platform_t plat, struct cpuref *cpuref)
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{
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ihandle_t inst;
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phandle_t bsp, chosen;
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int res, cpuid;
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chosen = OF_finddevice("/chosen");
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if (chosen == 0)
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return (ENXIO);
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res = OF_getencprop(chosen, "cpu", &inst, sizeof(inst));
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if (res < 0)
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return (ENXIO);
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bsp = OF_instance_to_package(inst);
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/* Pick the primary thread. Can it be any other? */
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cpuref->cr_hwref = bsp;
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res = OF_getencprop(bsp, "ibm,ppc-interrupt-server#s", &cpuid,
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sizeof(cpuid));
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if (res <= 0)
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res = OF_getencprop(bsp, "reg", &cpuid, sizeof(cpuid));
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if (res <= 0)
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cpuid = 0;
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cpuref->cr_cpuid = cpuid;
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return (0);
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}
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#ifdef SMP
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static int
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chrp_smp_start_cpu(platform_t plat, struct pcpu *pc)
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{
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cell_t start_cpu;
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int result, err, timeout;
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if (!rtas_exists()) {
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printf("RTAS uninitialized: unable to start AP %d\n",
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pc->pc_cpuid);
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return (ENXIO);
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}
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start_cpu = rtas_token_lookup("start-cpu");
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if (start_cpu == -1) {
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printf("RTAS unknown method: unable to start AP %d\n",
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pc->pc_cpuid);
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return (ENXIO);
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}
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ap_pcpu = pc;
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powerpc_sync();
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result = rtas_call_method(start_cpu, 3, 1, pc->pc_cpuid, EXC_RST, pc,
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&err);
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if (result < 0 || err != 0) {
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printf("RTAS error (%d/%d): unable to start AP %d\n",
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result, err, pc->pc_cpuid);
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return (ENXIO);
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}
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timeout = 10000;
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while (!pc->pc_awake && timeout--)
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DELAY(100);
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return ((pc->pc_awake) ? 0 : EBUSY);
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}
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static struct cpu_group *
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chrp_smp_topo(platform_t plat)
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{
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struct pcpu *pc, *last_pc;
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int i, ncores, ncpus;
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ncores = ncpus = 0;
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last_pc = NULL;
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for (i = 0; i <= mp_maxid; i++) {
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pc = pcpu_find(i);
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if (pc == NULL)
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continue;
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if (last_pc == NULL || pc->pc_hwref != last_pc->pc_hwref)
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ncores++;
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last_pc = pc;
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ncpus++;
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}
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if (ncpus % ncores != 0) {
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printf("WARNING: Irregular SMP topology. Performance may be "
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"suboptimal (%d CPUS, %d cores)\n", ncpus, ncores);
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return (smp_topo_none());
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}
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/* Don't do anything fancier for non-threaded SMP */
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if (ncpus == ncores)
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return (smp_topo_none());
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return (smp_topo_1level(CG_SHARE_L1, ncpus / ncores, CG_FLAG_SMT));
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}
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#endif
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static void
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chrp_reset(platform_t platform)
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{
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OF_reboot();
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}
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#ifdef __powerpc64__
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static void
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phyp_cpu_idle(sbintime_t sbt)
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{
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register_t msr;
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msr = mfmsr();
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mtmsr(msr & ~PSL_EE);
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if (sched_runnable()) {
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mtmsr(msr);
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return;
|
|
}
|
|
|
|
phyp_hcall(H_CEDE); /* Re-enables interrupts internally */
|
|
mtmsr(msr);
|
|
}
|
|
|
|
static void
|
|
chrp_smp_ap_init(platform_t platform)
|
|
{
|
|
if (!(mfmsr() & PSL_HV)) {
|
|
/* Register VPA */
|
|
phyp_hcall(H_REGISTER_VPA, 1UL, PCPU_GET(cpuid),
|
|
splpar_vpa[PCPU_GET(cpuid)]);
|
|
|
|
/* Set interrupt priority */
|
|
phyp_hcall(H_CPPR, 0xff);
|
|
}
|
|
}
|
|
#else
|
|
static void
|
|
chrp_smp_ap_init(platform_t platform)
|
|
{
|
|
}
|
|
#endif
|
|
|