From c3468952f073a9d4efa1e60c04c6e640ed9cf9d0 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 27 Oct 2014 16:12:03 +0800 Subject: x86, irq: Move HT IRQ related code from io_apic.c into htirq.c Create arch/x86/kernel/apic/htirq.c to host Hypertransport IRQ related code, preparing for enabling hierarchy irqdomain. Signed-off-by: Jiang Liu Cc: Konrad Rzeszutek Wilk Cc: Tony Luck Cc: Joerg Roedel Cc: Greg Kroah-Hartman Cc: Benjamin Herrenschmidt Cc: Rafael J. Wysocki Cc: Bjorn Helgaas Cc: Randy Dunlap Cc: Yinghai Lu Cc: Borislav Petkov Cc: Grant Likely Cc: Prarit Bhargava Link: http://lkml.kernel.org/r/1414397531-28254-13-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- arch/x86/kernel/apic/htirq.c | 107 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 arch/x86/kernel/apic/htirq.c (limited to 'arch/x86/kernel/apic/htirq.c') diff --git a/arch/x86/kernel/apic/htirq.c b/arch/x86/kernel/apic/htirq.c new file mode 100644 index 000000000000..a4980c5091f0 --- /dev/null +++ b/arch/x86/kernel/apic/htirq.c @@ -0,0 +1,107 @@ +/* + * Support Hypertransport IRQ + * + * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo + * Moved from arch/x86/kernel/apic/io_apic.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Hypertransport interrupt support + */ +static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector) +{ + struct ht_irq_msg msg; + + fetch_ht_irq_msg(irq, &msg); + + msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK); + msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK); + + msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest); + msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest); + + write_ht_irq_msg(irq, &msg); +} + +static int +ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) +{ + struct irq_cfg *cfg = data->chip_data; + unsigned int dest; + int ret; + + ret = apic_set_affinity(data, mask, &dest); + if (ret) + return ret; + + target_ht_irq(data->irq, dest, cfg->vector); + return IRQ_SET_MASK_OK_NOCOPY; +} + +static struct irq_chip ht_irq_chip = { + .name = "PCI-HT", + .irq_mask = mask_ht_irq, + .irq_unmask = unmask_ht_irq, + .irq_ack = apic_ack_edge, + .irq_set_affinity = ht_set_affinity, + .irq_retrigger = apic_retrigger_irq, + .flags = IRQCHIP_SKIP_SET_WAKE, +}; + +int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) +{ + struct irq_cfg *cfg; + struct ht_irq_msg msg; + unsigned dest; + int err; + + if (disable_apic) + return -ENXIO; + + cfg = irq_cfg(irq); + err = assign_irq_vector(irq, cfg, apic->target_cpus()); + if (err) + return err; + + err = apic->cpu_mask_to_apicid_and(cfg->domain, + apic->target_cpus(), &dest); + if (err) + return err; + + msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest); + + msg.address_lo = + HT_IRQ_LOW_BASE | + HT_IRQ_LOW_DEST_ID(dest) | + HT_IRQ_LOW_VECTOR(cfg->vector) | + ((apic->irq_dest_mode == 0) ? + HT_IRQ_LOW_DM_PHYSICAL : + HT_IRQ_LOW_DM_LOGICAL) | + HT_IRQ_LOW_RQEOI_EDGE | + ((apic->irq_delivery_mode != dest_LowestPrio) ? + HT_IRQ_LOW_MT_FIXED : + HT_IRQ_LOW_MT_ARBITRATED) | + HT_IRQ_LOW_IRQ_MASKED; + + write_ht_irq_msg(irq, &msg); + + irq_set_chip_and_handler_name(irq, &ht_irq_chip, + handle_edge_irq, "edge"); + + dev_dbg(&dev->dev, "irq %d for HT\n", irq); + + return 0; +} -- cgit v1.2.3