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Release 4.14 arch/powerpc/sysdev/xics/ics-opal.c

/*
 * ICS backend for OPAL managed interrupts.
 *
 * Copyright 2011 IBM Corp.
 *
 * 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.
 */


#undef DEBUG

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/spinlock.h>
#include <linux/msi.h>

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


static int ics_opal_mangle_server(int server) { /* No link for now */ return server << 2; }

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Benjamin Herrenschmidt15100.00%1100.00%
Total15100.00%1100.00%


static int ics_opal_unmangle_server(int server) { /* No link for now */ return server >> 2; }

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Benjamin Herrenschmidt15100.00%1100.00%
Total15100.00%1100.00%


static void ics_opal_unmask_irq(struct irq_data *d) { unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); int64_t rc; int server; pr_devel("ics-hal: unmask virq %d [hw 0x%x]\n", d->irq, hw_irq); if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS) return; server = xics_get_irq_server(d->irq, irq_data_get_affinity_mask(d), 0); server = ics_opal_mangle_server(server); rc = opal_set_xive(hw_irq, server, DEFAULT_PRIORITY); if (rc != OPAL_SUCCESS) pr_err("%s: opal_set_xive(irq=%d [hw 0x%x] server=%x)" " error %lld\n", __func__, d->irq, hw_irq, server, rc); }

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Benjamin Herrenschmidt10797.27%150.00%
Jiang Liu32.73%150.00%
Total110100.00%2100.00%


static unsigned int ics_opal_startup(struct irq_data *d) { #ifdef CONFIG_PCI_MSI /* * The generic MSI code returns with the interrupt disabled on the * card, using the MSI mask bits. Firmware doesn't appear to unmask * at that level, so we do it here by hand. */ if (irq_data_get_msi_desc(d)) pci_msi_unmask_irq(d); #endif /* unmask it */ ics_opal_unmask_irq(d); return 0; }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt3589.74%133.33%
Jiang Liu37.69%133.33%
Thomas Gleixner12.56%133.33%
Total39100.00%3100.00%


static void ics_opal_mask_real_irq(unsigned int hw_irq) { int server = ics_opal_mangle_server(xics_default_server); int64_t rc; if (hw_irq == XICS_IPI) return; /* Have to set XIVE to 0xff to be able to remove a slot */ rc = opal_set_xive(hw_irq, server, 0xff); if (rc != OPAL_SUCCESS) pr_err("%s: opal_set_xive(0xff) irq=%u returned %lld\n", __func__, hw_irq, rc); }

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Benjamin Herrenschmidt57100.00%1100.00%
Total57100.00%1100.00%


static void ics_opal_mask_irq(struct irq_data *d) { unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); pr_devel("ics-hal: mask virq %d [hw 0x%x]\n", d->irq, hw_irq); if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS) return; ics_opal_mask_real_irq(hw_irq); }

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Benjamin Herrenschmidt51100.00%1100.00%
Total51100.00%1100.00%


static int ics_opal_set_affinity(struct irq_data *d, const struct cpumask *cpumask, bool force) { unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); __be16 oserver; int16_t server; int8_t priority; int64_t rc; int wanted_server; if (hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS) return -1; rc = opal_get_xive(hw_irq, &oserver, &priority); if (rc != OPAL_SUCCESS) { pr_err("%s: opal_get_xive(irq=%d [hw 0x%x]) error %lld\n", __func__, d->irq, hw_irq, rc); return -1; } server = be16_to_cpu(oserver); wanted_server = xics_get_irq_server(d->irq, cpumask, 1); if (wanted_server < 0) { pr_warning("%s: No online cpus in the mask %*pb for irq %d\n", __func__, cpumask_pr_args(cpumask), d->irq); return -1; } server = ics_opal_mangle_server(wanted_server); pr_devel("ics-hal: set-affinity irq %d [hw 0x%x] server: 0x%x/0x%x\n", d->irq, hw_irq, wanted_server, server); rc = opal_set_xive(hw_irq, server, priority); if (rc != OPAL_SUCCESS) { pr_err("%s: opal_set_xive(irq=%d [hw 0x%x] server=%x)" " error %lld\n", __func__, d->irq, hw_irq, server, rc); return -1; } return IRQ_SET_MASK_OK; }

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Benjamin Herrenschmidt21097.22%250.00%
Tejun Heo52.31%125.00%
Alexander Gordeev10.46%125.00%
Total216100.00%4100.00%

static struct irq_chip ics_opal_irq_chip = { .name = "OPAL ICS", .irq_startup = ics_opal_startup, .irq_mask = ics_opal_mask_irq, .irq_unmask = ics_opal_unmask_irq, .irq_eoi = NULL, /* Patched at init time */ .irq_set_affinity = ics_opal_set_affinity, .irq_set_type = xics_set_irq_type, .irq_retrigger = xics_retrigger, }; static int ics_opal_map(struct ics *ics, unsigned int virq); static void ics_opal_mask_unknown(struct ics *ics, unsigned long vec); static long ics_opal_get_server(struct ics *ics, unsigned long vec);
static int ics_opal_host_match(struct ics *ics, struct device_node *node) { return 1; }

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Benjamin Herrenschmidt19100.00%1100.00%
Total19100.00%1100.00%

/* Only one global & state struct ics */ static struct ics ics_hal = { .map = ics_opal_map, .mask_unknown = ics_opal_mask_unknown, .get_server = ics_opal_get_server, .host_match = ics_opal_host_match, };
static int ics_opal_map(struct ics *ics, unsigned int virq) { unsigned int hw_irq = (unsigned int)virq_to_hw(virq); int64_t rc; __be16 server; int8_t priority; if (WARN_ON(hw_irq == XICS_IPI || hw_irq == XICS_IRQ_SPURIOUS)) return -EINVAL; /* Check if HAL knows about this interrupt */ rc = opal_get_xive(hw_irq, &server, &priority); if (rc != OPAL_SUCCESS) return -ENXIO; irq_set_chip_and_handler(virq, &ics_opal_irq_chip, handle_fasteoi_irq); irq_set_chip_data(virq, &ics_hal); return 0; }

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Benjamin Herrenschmidt99100.00%2100.00%
Total99100.00%2100.00%


static void ics_opal_mask_unknown(struct ics *ics, unsigned long vec) { int64_t rc; __be16 server; int8_t priority; /* Check if HAL knows about this interrupt */ rc = opal_get_xive(vec, &server, &priority); if (rc != OPAL_SUCCESS) return; ics_opal_mask_real_irq(vec); }

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Benjamin Herrenschmidt50100.00%2100.00%
Total50100.00%2100.00%


static long ics_opal_get_server(struct ics *ics, unsigned long vec) { int64_t rc; __be16 server; int8_t priority; /* Check if HAL knows about this interrupt */ rc = opal_get_xive(vec, &server, &priority); if (rc != OPAL_SUCCESS) return -1; return ics_opal_unmangle_server(be16_to_cpu(server)); }

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Benjamin Herrenschmidt57100.00%2100.00%
Total57100.00%2100.00%


int __init ics_opal_init(void) { if (!firmware_has_feature(FW_FEATURE_OPAL)) return -ENODEV; /* We need to patch our irq chip's EOI to point to the * right ICP */ ics_opal_irq_chip.irq_eoi = icp_ops->eoi; /* Register ourselves */ xics_register_ics(&ics_hal); pr_info("ICS OPAL backend registered\n"); return 0; }

Contributors

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Benjamin Herrenschmidt44100.00%1100.00%
Total44100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt93598.63%337.50%
Jiang Liu60.63%225.00%
Tejun Heo50.53%112.50%
Alexander Gordeev10.11%112.50%
Thomas Gleixner10.11%112.50%
Total948100.00%8100.00%
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