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Release 4.14 arch/powerpc/sysdev/xics/xics-common.c

/*
 * Copyright 2011 IBM Corporation.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */
#include <linux/types.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/debugfs.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/delay.h>

#include <asm/prom.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/errno.h>
#include <asm/rtas.h>
#include <asm/xics.h>
#include <asm/firmware.h>

/* Globals common to all ICP/ICS implementations */

const struct icp_ops	*icp_ops;


unsigned int xics_default_server		= 0xff;

unsigned int xics_default_distrib_server	= 0;

unsigned int xics_interrupt_server_size		= 8;

DEFINE_PER_CPU(struct xics_cppr, xics_cppr);


struct irq_domain *xics_host;

static LIST_HEAD(ics_list);


void xics_update_irq_servers(void) { int i, j; struct device_node *np; u32 ilen; const __be32 *ireg; u32 hcpuid; /* Find the server numbers for the boot cpu. */ np = of_get_cpu_node(boot_cpuid, NULL); BUG_ON(!np); hcpuid = get_hard_smp_processor_id(boot_cpuid); xics_default_server = xics_default_distrib_server = hcpuid; pr_devel("xics: xics_default_server = 0x%x\n", xics_default_server); ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen); if (!ireg) { of_node_put(np); return; } i = ilen / sizeof(int); /* Global interrupt distribution server is specified in the last * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last * entry fom this property for current boot cpu id and use it as * default distribution server */ for (j = 0; j < i; j += 2) { if (be32_to_cpu(ireg[j]) == hcpuid) { xics_default_distrib_server = be32_to_cpu(ireg[j+1]); break; } } pr_devel("xics: xics_default_distrib_server = 0x%x\n", xics_default_distrib_server); of_node_put(np); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt14795.45%266.67%
Anton Blanchard74.55%133.33%
Total154100.00%3100.00%

/* GIQ stuff, currently only supported on RTAS setups, will have * to be sorted properly for bare metal */
void xics_set_cpu_giq(unsigned int gserver, unsigned int join) { #ifdef CONFIG_PPC_RTAS int index; int status; if (!rtas_indicator_present(GLOBAL_INTERRUPT_QUEUE, NULL)) return; index = (1UL << xics_interrupt_server_size) - 1 - gserver; status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, index, join); WARN(status < 0, "set-indicator(%d, %d, %u) returned %d\n", GLOBAL_INTERRUPT_QUEUE, index, join, status); #endif }

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Benjamin Herrenschmidt75100.00%1100.00%
Total75100.00%1100.00%


void xics_setup_cpu(void) { icp_ops->set_priority(LOWEST_PRIORITY); xics_set_cpu_giq(xics_default_distrib_server, 1); }

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Benjamin Herrenschmidt21100.00%1100.00%
Total21100.00%1100.00%


void xics_mask_unknown_vec(unsigned int vec) { struct ics *ics; pr_err("Interrupt 0x%x (real) is invalid, disabling it.\n", vec); list_for_each_entry(ics, &ics_list, link) ics->mask_unknown(ics, vec); }

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Benjamin Herrenschmidt38100.00%2100.00%
Total38100.00%2100.00%

#ifdef CONFIG_SMP
static void xics_request_ipi(void) { unsigned int ipi; ipi = irq_create_mapping(xics_host, XICS_IPI); BUG_ON(!ipi); /* * IPIs are marked IRQF_PERCPU. The handler was set in map. */ BUG_ON(request_irq(ipi, icp_ops->ipi_action, IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL)); }

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Benjamin Herrenschmidt4491.67%125.00%
Thomas Gleixner24.17%125.00%
Yong Zhang12.08%125.00%
Michael Ellerman12.08%125.00%
Total48100.00%4100.00%


void __init xics_smp_probe(void) { /* Register all the IPIs */ xics_request_ipi(); /* Setup cause_ipi callback based on which ICP is used */ smp_ops->cause_ipi = icp_ops->cause_ipi; }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt1152.38%133.33%
Michael Ellerman1047.62%266.67%
Total21100.00%3100.00%

#endif /* CONFIG_SMP */
void xics_teardown_cpu(void) { struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr); /* * we have to reset the cppr index to 0 because we're * not going to return from the IPI */ os_cppr->index = 0; icp_ops->set_priority(0); icp_ops->teardown_cpu(); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt3594.59%150.00%
Christoph Lameter25.41%150.00%
Total37100.00%2100.00%


void xics_kexec_teardown_cpu(int secondary) { xics_teardown_cpu(); icp_ops->flush_ipi(); /* * Some machines need to have at least one cpu in the GIQ, * so leave the master cpu in the group. */ if (secondary) xics_set_cpu_giq(xics_default_distrib_server, 0); }

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Benjamin Herrenschmidt28100.00%1100.00%
Total28100.00%1100.00%

#ifdef CONFIG_HOTPLUG_CPU /* Interrupts are disabled. */
void xics_migrate_irqs_away(void) { int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id(); unsigned int irq, virq; struct irq_desc *desc; /* If we used to be the default server, move to the new "boot_cpuid" */ if (hw_cpu == xics_default_server) xics_update_irq_servers(); /* Reject any interrupt that was queued to us... */ icp_ops->set_priority(0); /* Remove ourselves from the global interrupt queue */ xics_set_cpu_giq(xics_default_distrib_server, 0); for_each_irq_desc(virq, desc) { struct irq_chip *chip; long server; unsigned long flags; struct ics *ics; /* We can't set affinity on ISA interrupts */ if (virq < NUM_ISA_INTERRUPTS) continue; /* We only need to migrate enabled IRQS */ if (!desc->action) continue; if (desc->irq_data.domain != xics_host) continue; irq = desc->irq_data.hwirq; /* We need to get IPIs still. */ if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) continue; chip = irq_desc_get_chip(desc); if (!chip || !chip->irq_set_affinity) continue; raw_spin_lock_irqsave(&desc->lock, flags); /* Locate interrupt server */ server = -1; ics = irq_desc_get_chip_data(desc); if (ics) server = ics->get_server(ics, irq); if (server < 0) { printk(KERN_ERR "%s: Can't find server for irq %d\n", __func__, irq); goto unlock; } /* We only support delivery to all cpus or to one cpu. * The irq has to be migrated only in the single cpu * case. */ if (server != hw_cpu) goto unlock; /* This is expected during cpu offline. */ if (cpu_online(cpu)) pr_warning("IRQ %u affinity broken off cpu %u\n", virq, cpu); /* Reset affinity to all cpus */ raw_spin_unlock_irqrestore(&desc->lock, flags); irq_set_affinity(virq, cpu_all_mask); continue; unlock: raw_spin_unlock_irqrestore(&desc->lock, flags); } /* Allow "sufficient" time to drop any inflight IRQ's */ mdelay(5); /* * Allow IPIs again. This is done at the very end, after migrating all * interrupts, the expectation is that we'll only get woken up by an IPI * interrupt beyond this point, but leave externals masked just to be * safe. If we're using icp-opal this may actually allow all * interrupts anyway, but that should be OK. */ icp_ops->set_priority(DEFAULT_PRIORITY); }

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Benjamin Herrenschmidt23384.12%116.67%
Grant C. Likely279.75%233.33%
Balbir Singh145.05%116.67%
Jiang Liu20.72%116.67%
Milton D. Miller II10.36%116.67%
Total277100.00%6100.00%

#endif /* CONFIG_HOTPLUG_CPU */ #ifdef CONFIG_SMP /* * For the moment we only implement delivery to all cpus or one cpu. * * If the requested affinity is cpu_all_mask, we set global affinity. * If not we set it to the first cpu in the mask, even if multiple cpus * are set. This is so things like irqbalance (which set core and package * wide affinities) do the right thing. * * We need to fix this to implement support for the links */
int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask, unsigned int strict_check) { if (!distribute_irqs) return xics_default_server; if (!cpumask_subset(cpu_possible_mask, cpumask)) { int server = cpumask_first_and(cpu_online_mask, cpumask); if (server < nr_cpu_ids) return get_hard_smp_processor_id(server); if (strict_check) return -1; } /* * Workaround issue with some versions of JS20 firmware that * deliver interrupts to cpus which haven't been started. This * happens when using the maxcpus= boot option. */ if (cpumask_equal(cpu_online_mask, cpu_present_mask)) return xics_default_distrib_server; return xics_default_server; }

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Benjamin Herrenschmidt85100.00%1100.00%
Total85100.00%1100.00%

#endif /* CONFIG_SMP */
static int xics_host_match(struct irq_domain *h, struct device_node *node, enum irq_domain_bus_token bus_token) { struct ics *ics; list_for_each_entry(ics, &ics_list, link) if (ics->host_match(ics, node)) return 1; return 0; }

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PersonTokensPropCommitsCommitProp
Michael Ellerman2652.00%125.00%
Benjamin Herrenschmidt1938.00%125.00%
Marc Zyngier48.00%125.00%
Grant C. Likely12.00%125.00%
Total50100.00%4100.00%

/* Dummies */
static void xics_ipi_unmask(struct irq_data *d) { }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt10100.00%1100.00%
Total10100.00%1100.00%


static void xics_ipi_mask(struct irq_data *d) { }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt10100.00%1100.00%
Total10100.00%1100.00%

static struct irq_chip xics_ipi_chip = { .name = "XICS", .irq_eoi = NULL, /* Patched at init time */ .irq_mask = xics_ipi_mask, .irq_unmask = xics_ipi_unmask, };
static int xics_host_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { struct ics *ics; pr_devel("xics: map virq %d, hwirq 0x%lx\n", virq, hw); /* * Mark interrupts as edge sensitive by default so that resend * actually works. The device-tree parsing will turn the LSIs * back to level. */ irq_clear_status_flags(virq, IRQ_LEVEL); /* Don't call into ICS for IPIs */ if (hw == XICS_IPI) { irq_set_chip_and_handler(virq, &xics_ipi_chip, handle_percpu_irq); return 0; } /* Let the ICS setup the chip data */ list_for_each_entry(ics, &ics_list, link) if (ics->map(ics, virq) == 0) return 0; return -EINVAL; }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt8593.41%250.00%
Milton D. Miller II55.49%125.00%
Grant C. Likely11.10%125.00%
Total91100.00%4100.00%


static int xics_host_xlate(struct irq_domain *h, struct device_node *ct, const u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_flags) { *out_hwirq = intspec[0]; /* * If intsize is at least 2, we look for the type in the second cell, * we assume the LSB indicates a level interrupt. */ if (intsize > 1) { if (intspec[1] & 1) *out_flags = IRQ_TYPE_LEVEL_LOW; else *out_flags = IRQ_TYPE_EDGE_RISING; } else *out_flags = IRQ_TYPE_LEVEL_LOW; return 0; }

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Benjamin Herrenschmidt7998.75%266.67%
Grant C. Likely11.25%133.33%
Total80100.00%3100.00%


int xics_set_irq_type(struct irq_data *d, unsigned int flow_type) { /* * We only support these. This has really no effect other than setting * the corresponding descriptor bits mind you but those will in turn * affect the resend function when re-enabling an edge interrupt. * * Set set the default to edge as explained in map(). */ if (flow_type == IRQ_TYPE_DEFAULT || flow_type == IRQ_TYPE_NONE) flow_type = IRQ_TYPE_EDGE_RISING; if (flow_type != IRQ_TYPE_EDGE_RISING && flow_type != IRQ_TYPE_LEVEL_LOW) return -EINVAL; irqd_set_trigger_type(d, flow_type); return IRQ_SET_MASK_OK_NOCOPY; }

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Benjamin Herrenschmidt53100.00%1100.00%
Total53100.00%1100.00%


int xics_retrigger(struct irq_data *data) { /* * We need to push a dummy CPPR when retriggering, since the subsequent * EOI will try to pop it. Passing 0 works, as the function hard codes * the priority value anyway. */ xics_push_cppr(0); /* Tell the core to do a soft retrigger */ return 0; }

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Benjamin Herrenschmidt20100.00%1100.00%
Total20100.00%1100.00%

static const struct irq_domain_ops xics_host_ops = { .match = xics_host_match, .map = xics_host_map, .xlate = xics_host_xlate, };
static void __init xics_init_host(void) { xics_host = irq_domain_add_tree(NULL, &xics_host_ops, NULL); BUG_ON(xics_host == NULL); irq_set_default_host(xics_host); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt3193.94%150.00%
Grant C. Likely26.06%150.00%
Total33100.00%2100.00%


void __init xics_register_ics(struct ics *ics) { list_add(&ics->link, &ics_list); }

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Benjamin Herrenschmidt22100.00%1100.00%
Total22100.00%1100.00%


static void __init xics_get_server_size(void) { struct device_node *np; const __be32 *isize; /* We fetch the interrupt server size from the first ICS node * we find if any */ np = of_find_compatible_node(NULL, NULL, "ibm,ppc-xics"); if (!np) return; isize = of_get_property(np, "ibm,interrupt-server#-size", NULL); if (!isize) return; xics_interrupt_server_size = be32_to_cpu(*isize); of_node_put(np); }

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Benjamin Herrenschmidt6394.03%150.00%
Anton Blanchard45.97%150.00%
Total67100.00%2100.00%


void __init xics_init(void) { int rc = -1; /* Fist locate ICP */ if (firmware_has_feature(FW_FEATURE_LPAR)) rc = icp_hv_init(); if (rc < 0) { rc = icp_native_init(); if (rc == -ENODEV) rc = icp_opal_init(); } if (rc < 0) { pr_warning("XICS: Cannot find a Presentation Controller !\n"); return; } /* Copy get_irq callback over to ppc_md */ ppc_md.get_irq = icp_ops->get_irq; /* Patch up IPI chip EOI */ xics_ipi_chip.irq_eoi = icp_ops->eoi; /* Now locate ICS */ rc = ics_rtas_init(); if (rc < 0) rc = ics_opal_init(); if (rc < 0) pr_warning("XICS: Cannot find a Source Controller !\n"); /* Initialize common bits */ xics_get_server_size(); xics_update_irq_servers(); xics_init_host(); xics_setup_cpu(); }

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Benjamin Herrenschmidt125100.00%3100.00%
Total125100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt141592.36%521.74%
Michael Ellerman372.42%417.39%
Grant C. Likely342.22%417.39%
Balbir Singh171.11%14.35%
Anton Blanchard110.72%14.35%
Milton D. Miller II60.39%28.70%
Marc Zyngier40.26%14.35%
Christoph Lameter20.13%14.35%
Jiang Liu20.13%14.35%
Thomas Gleixner20.13%14.35%
Krzysztof Kozlowski10.07%14.35%
Yong Zhang10.07%14.35%
Total1532100.00%23100.00%
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