x86/PCI: Remove unused HyperTransport interrupt support
There are no in-tree callers of ht_create_irq(), the driver interface for
HyperTransport interrupts, left. Remove the unused entry point and all the
supporting code.
See 8b955b0ddd ("[PATCH] Initial generic hypertransport interrupt
support").
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-pci@vger.kernel.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Link: https://lkml.kernel.org/r/20171122221337.3877.23362.stgit@bhelgaas-glaptop.roam.corp.google.com
hifive-unleashed-5.1
Bjorn Helgaas
Thomas Gleixner
parent
e2a5dca753
commit
fd2fa6c18b
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@ -99,14 +99,6 @@ struct irq_alloc_info {
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void *dmar_data;
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};
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#endif
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#ifdef CONFIG_HT_IRQ
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struct {
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int ht_pos;
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int ht_idx;
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struct pci_dev *ht_dev;
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void *ht_update;
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};
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#endif
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#ifdef CONFIG_X86_UV
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struct {
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int uv_limit;
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@ -1,46 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_HYPERTRANSPORT_H
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#define _ASM_X86_HYPERTRANSPORT_H
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/*
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* Constants for x86 Hypertransport Interrupts.
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*/
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#define HT_IRQ_LOW_BASE 0xf8000000
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#define HT_IRQ_LOW_VECTOR_SHIFT 16
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#define HT_IRQ_LOW_VECTOR_MASK 0x00ff0000
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#define HT_IRQ_LOW_VECTOR(v) \
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(((v) << HT_IRQ_LOW_VECTOR_SHIFT) & HT_IRQ_LOW_VECTOR_MASK)
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#define HT_IRQ_LOW_DEST_ID_SHIFT 8
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#define HT_IRQ_LOW_DEST_ID_MASK 0x0000ff00
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#define HT_IRQ_LOW_DEST_ID(v) \
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(((v) << HT_IRQ_LOW_DEST_ID_SHIFT) & HT_IRQ_LOW_DEST_ID_MASK)
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#define HT_IRQ_LOW_DM_PHYSICAL 0x0000000
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#define HT_IRQ_LOW_DM_LOGICAL 0x0000040
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#define HT_IRQ_LOW_RQEOI_EDGE 0x0000000
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#define HT_IRQ_LOW_RQEOI_LEVEL 0x0000020
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#define HT_IRQ_LOW_MT_FIXED 0x0000000
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#define HT_IRQ_LOW_MT_ARBITRATED 0x0000004
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#define HT_IRQ_LOW_MT_SMI 0x0000008
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#define HT_IRQ_LOW_MT_NMI 0x000000c
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#define HT_IRQ_LOW_MT_INIT 0x0000010
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#define HT_IRQ_LOW_MT_STARTUP 0x0000014
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#define HT_IRQ_LOW_MT_EXTINT 0x0000018
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#define HT_IRQ_LOW_MT_LINT1 0x000008c
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#define HT_IRQ_LOW_MT_LINT0 0x0000098
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#define HT_IRQ_LOW_IRQ_MASKED 0x0000001
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#define HT_IRQ_HIGH_DEST_ID_SHIFT 0
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#define HT_IRQ_HIGH_DEST_ID_MASK 0x00ffffff
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#define HT_IRQ_HIGH_DEST_ID(v) \
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((((v) >> 8) << HT_IRQ_HIGH_DEST_ID_SHIFT) & HT_IRQ_HIGH_DEST_ID_MASK)
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#endif /* _ASM_X86_HYPERTRANSPORT_H */
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@ -56,10 +56,4 @@ extern void arch_init_msi_domain(struct irq_domain *domain);
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static inline void arch_init_msi_domain(struct irq_domain *domain) { }
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#endif
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#ifdef CONFIG_HT_IRQ
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extern void arch_init_htirq_domain(struct irq_domain *domain);
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#else
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static inline void arch_init_htirq_domain(struct irq_domain *domain) { }
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#endif
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#endif
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@ -12,7 +12,6 @@ obj-y += hw_nmi.o
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obj-$(CONFIG_X86_IO_APIC) += io_apic.o
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obj-$(CONFIG_PCI_MSI) += msi.o
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obj-$(CONFIG_HT_IRQ) += htirq.o
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obj-$(CONFIG_SMP) += ipi.o
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ifeq ($(CONFIG_X86_64),y)
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@ -1,198 +0,0 @@
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/*
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* Support Hypertransport IRQ
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*
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* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
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* Moved from arch/x86/kernel/apic/io_apic.c.
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* Jiang Liu <jiang.liu@linux.intel.com>
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* Add support of hierarchical irqdomain
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/pci.h>
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#include <linux/htirq.h>
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#include <asm/irqdomain.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#include <asm/hypertransport.h>
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static struct irq_domain *htirq_domain;
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/*
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* Hypertransport interrupt support
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*/
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static int
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ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
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{
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struct irq_data *parent = data->parent_data;
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int ret;
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ret = parent->chip->irq_set_affinity(parent, mask, force);
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if (ret >= 0) {
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struct ht_irq_msg msg;
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struct irq_cfg *cfg = irqd_cfg(data);
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fetch_ht_irq_msg(data->irq, &msg);
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msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK |
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HT_IRQ_LOW_DEST_ID_MASK);
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msg.address_lo |= HT_IRQ_LOW_VECTOR(cfg->vector) |
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HT_IRQ_LOW_DEST_ID(cfg->dest_apicid);
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msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
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msg.address_hi |= HT_IRQ_HIGH_DEST_ID(cfg->dest_apicid);
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write_ht_irq_msg(data->irq, &msg);
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}
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return ret;
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}
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static struct irq_chip ht_irq_chip = {
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.name = "PCI-HT",
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.irq_mask = mask_ht_irq,
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.irq_unmask = unmask_ht_irq,
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.irq_ack = irq_chip_ack_parent,
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.irq_set_affinity = ht_set_affinity,
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.irq_retrigger = irq_chip_retrigger_hierarchy,
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.flags = IRQCHIP_SKIP_SET_WAKE,
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};
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static int htirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *arg)
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{
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struct ht_irq_cfg *ht_cfg;
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struct irq_alloc_info *info = arg;
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struct pci_dev *dev;
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irq_hw_number_t hwirq;
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int ret;
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if (nr_irqs > 1 || !info)
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return -EINVAL;
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dev = info->ht_dev;
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hwirq = (info->ht_idx & 0xFF) |
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PCI_DEVID(dev->bus->number, dev->devfn) << 8 |
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(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 24;
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if (irq_find_mapping(domain, hwirq) > 0)
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return -EEXIST;
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ht_cfg = kmalloc(sizeof(*ht_cfg), GFP_KERNEL);
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if (!ht_cfg)
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return -ENOMEM;
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ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
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if (ret < 0) {
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kfree(ht_cfg);
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return ret;
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}
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/* Initialize msg to a value that will never match the first write. */
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ht_cfg->msg.address_lo = 0xffffffff;
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ht_cfg->msg.address_hi = 0xffffffff;
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ht_cfg->dev = info->ht_dev;
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ht_cfg->update = info->ht_update;
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ht_cfg->pos = info->ht_pos;
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ht_cfg->idx = 0x10 + (info->ht_idx * 2);
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irq_domain_set_info(domain, virq, hwirq, &ht_irq_chip, ht_cfg,
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handle_edge_irq, ht_cfg, "edge");
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return 0;
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}
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static void htirq_domain_free(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs)
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{
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struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq);
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BUG_ON(nr_irqs != 1);
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kfree(irq_data->chip_data);
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irq_domain_free_irqs_top(domain, virq, nr_irqs);
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}
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static int htirq_domain_activate(struct irq_domain *domain,
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struct irq_data *irq_data, bool early)
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{
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struct ht_irq_msg msg;
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struct irq_cfg *cfg = irqd_cfg(irq_data);
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msg.address_hi = HT_IRQ_HIGH_DEST_ID(cfg->dest_apicid);
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msg.address_lo =
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HT_IRQ_LOW_BASE |
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HT_IRQ_LOW_DEST_ID(cfg->dest_apicid) |
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HT_IRQ_LOW_VECTOR(cfg->vector) |
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((apic->irq_dest_mode == 0) ?
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HT_IRQ_LOW_DM_PHYSICAL :
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HT_IRQ_LOW_DM_LOGICAL) |
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HT_IRQ_LOW_RQEOI_EDGE |
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((apic->irq_delivery_mode != dest_LowestPrio) ?
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HT_IRQ_LOW_MT_FIXED :
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HT_IRQ_LOW_MT_ARBITRATED) |
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HT_IRQ_LOW_IRQ_MASKED;
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write_ht_irq_msg(irq_data->irq, &msg);
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return 0;
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}
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static void htirq_domain_deactivate(struct irq_domain *domain,
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struct irq_data *irq_data)
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{
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struct ht_irq_msg msg;
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memset(&msg, 0, sizeof(msg));
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write_ht_irq_msg(irq_data->irq, &msg);
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}
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static const struct irq_domain_ops htirq_domain_ops = {
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.alloc = htirq_domain_alloc,
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.free = htirq_domain_free,
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.activate = htirq_domain_activate,
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.deactivate = htirq_domain_deactivate,
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};
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void __init arch_init_htirq_domain(struct irq_domain *parent)
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{
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struct fwnode_handle *fn;
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if (disable_apic)
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return;
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fn = irq_domain_alloc_named_fwnode("PCI-HT");
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if (!fn)
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goto warn;
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htirq_domain = irq_domain_create_tree(fn, &htirq_domain_ops, NULL);
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irq_domain_free_fwnode(fn);
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if (!htirq_domain)
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goto warn;
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htirq_domain->parent = parent;
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return;
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warn:
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pr_warn("Failed to initialize irqdomain for HTIRQ.\n");
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}
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int arch_setup_ht_irq(int idx, int pos, struct pci_dev *dev,
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ht_irq_update_t *update)
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{
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struct irq_alloc_info info;
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if (!htirq_domain)
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return -ENOSYS;
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init_irq_alloc_info(&info, NULL);
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info.ht_idx = idx;
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info.ht_pos = pos;
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info.ht_dev = dev;
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info.ht_update = update;
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return irq_domain_alloc_irqs(htirq_domain, 1, dev_to_node(&dev->dev),
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&info);
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}
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void arch_teardown_ht_irq(unsigned int irq)
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{
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irq_domain_free_irqs(irq, 1);
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}
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@ -1,5 +1,5 @@
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/*
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* Local APIC related interfaces to support IOAPIC, MSI, HT_IRQ etc.
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* Local APIC related interfaces to support IOAPIC, MSI, etc.
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*
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* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
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* Moved from arch/x86/kernel/apic/io_apic.c.
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@ -601,7 +601,7 @@ int __init arch_probe_nr_irqs(void)
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nr_irqs = NR_VECTORS * nr_cpu_ids;
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nr = (gsi_top + nr_legacy_irqs()) + 8 * nr_cpu_ids;
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#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
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#if defined(CONFIG_PCI_MSI)
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/*
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* for MSI and HT dyn irq
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*/
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@ -663,7 +663,6 @@ int __init arch_early_irq_init(void)
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irq_set_default_host(x86_vector_domain);
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arch_init_msi_domain(x86_vector_domain);
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arch_init_htirq_domain(x86_vector_domain);
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BUG_ON(!alloc_cpumask_var(&vector_searchmask, GFP_KERNEL));
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@ -71,15 +71,6 @@ config XEN_PCIDEV_FRONTEND
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The PCI device frontend driver allows the kernel to import arbitrary
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PCI devices from a PCI backend to support PCI driver domains.
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config HT_IRQ
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bool "Interrupts on hypertransport devices"
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default y
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depends on PCI && X86_LOCAL_APIC
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help
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This allows native hypertransport devices to use interrupts.
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If unsure say Y.
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config PCI_ATS
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bool
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@ -24,9 +24,6 @@ endif
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# Build the PCI MSI interrupt support
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obj-$(CONFIG_PCI_MSI) += msi.o
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# Build the Hypertransport interrupt support
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obj-$(CONFIG_HT_IRQ) += htirq.o
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obj-$(CONFIG_PCI_ATS) += ats.o
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obj-$(CONFIG_PCI_IOV) += iov.o
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@ -1,135 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* File: htirq.c
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* Purpose: Hypertransport Interrupt Capability
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*
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* Copyright (C) 2006 Linux Networx
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* Copyright (C) Eric Biederman <ebiederman@lnxi.com>
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*/
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#include <linux/irq.h>
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#include <linux/pci.h>
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#include <linux/spinlock.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/htirq.h>
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/* Global ht irq lock.
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*
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* This is needed to serialize access to the data port in hypertransport
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* irq capability.
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*
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* With multiple simultaneous hypertransport irq devices it might pay
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* to make this more fine grained. But start with simple, stupid, and correct.
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*/
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static DEFINE_SPINLOCK(ht_irq_lock);
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void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
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{
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struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
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unsigned long flags;
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spin_lock_irqsave(&ht_irq_lock, flags);
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if (cfg->msg.address_lo != msg->address_lo) {
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pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx);
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pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_lo);
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}
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if (cfg->msg.address_hi != msg->address_hi) {
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pci_write_config_byte(cfg->dev, cfg->pos + 2, cfg->idx + 1);
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pci_write_config_dword(cfg->dev, cfg->pos + 4, msg->address_hi);
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}
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if (cfg->update)
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cfg->update(cfg->dev, irq, msg);
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spin_unlock_irqrestore(&ht_irq_lock, flags);
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cfg->msg = *msg;
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}
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void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg)
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{
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struct ht_irq_cfg *cfg = irq_get_handler_data(irq);
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*msg = cfg->msg;
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}
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void mask_ht_irq(struct irq_data *data)
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{
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struct ht_irq_cfg *cfg = irq_data_get_irq_handler_data(data);
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struct ht_irq_msg msg = cfg->msg;
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msg.address_lo |= 1;
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write_ht_irq_msg(data->irq, &msg);
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}
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void unmask_ht_irq(struct irq_data *data)
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{
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struct ht_irq_cfg *cfg = irq_data_get_irq_handler_data(data);
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struct ht_irq_msg msg = cfg->msg;
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msg.address_lo &= ~1;
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write_ht_irq_msg(data->irq, &msg);
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}
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/**
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* __ht_create_irq - create an irq and attach it to a device.
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* @dev: The hypertransport device to find the irq capability on.
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* @idx: Which of the possible irqs to attach to.
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* @update: Function to be called when changing the htirq message
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*
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* The irq number of the new irq or a negative error value is returned.
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*/
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int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
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{
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int max_irq, pos, irq;
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unsigned long flags;
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u32 data;
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pos = pci_find_ht_capability(dev, HT_CAPTYPE_IRQ);
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if (!pos)
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return -EINVAL;
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/* Verify the idx I want to use is in range */
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spin_lock_irqsave(&ht_irq_lock, flags);
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pci_write_config_byte(dev, pos + 2, 1);
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pci_read_config_dword(dev, pos + 4, &data);
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spin_unlock_irqrestore(&ht_irq_lock, flags);
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|
||||
max_irq = (data >> 16) & 0xff;
|
||||
if (idx > max_irq)
|
||||
return -EINVAL;
|
||||
|
||||
irq = arch_setup_ht_irq(idx, pos, dev, update);
|
||||
if (irq > 0)
|
||||
dev_dbg(&dev->dev, "irq %d for HT\n", irq);
|
||||
|
||||
return irq;
|
||||
}
|
||||
EXPORT_SYMBOL(__ht_create_irq);
|
||||
|
||||
/**
|
||||
* ht_create_irq - create an irq and attach it to a device.
|
||||
* @dev: The hypertransport device to find the irq capability on.
|
||||
* @idx: Which of the possible irqs to attach to.
|
||||
*
|
||||
* ht_create_irq needs to be called for all hypertransport devices
|
||||
* that generate irqs.
|
||||
*
|
||||
* The irq number of the new irq or a negative error value is returned.
|
||||
*/
|
||||
int ht_create_irq(struct pci_dev *dev, int idx)
|
||||
{
|
||||
return __ht_create_irq(dev, idx, NULL);
|
||||
}
|
||||
EXPORT_SYMBOL(ht_create_irq);
|
||||
|
||||
/**
|
||||
* ht_destroy_irq - destroy an irq created with ht_create_irq
|
||||
* @irq: irq to be destroyed
|
||||
*
|
||||
* This reverses ht_create_irq removing the specified irq from
|
||||
* existence. The irq should be free before this happens.
|
||||
*/
|
||||
void ht_destroy_irq(unsigned int irq)
|
||||
{
|
||||
arch_teardown_ht_irq(irq);
|
||||
}
|
||||
EXPORT_SYMBOL(ht_destroy_irq);
|
||||
|
|
@ -1,39 +0,0 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#ifndef LINUX_HTIRQ_H
|
||||
#define LINUX_HTIRQ_H
|
||||
|
||||
struct pci_dev;
|
||||
struct irq_data;
|
||||
|
||||
struct ht_irq_msg {
|
||||
u32 address_lo; /* low 32 bits of the ht irq message */
|
||||
u32 address_hi; /* high 32 bits of the it irq message */
|
||||
};
|
||||
|
||||
typedef void (ht_irq_update_t)(struct pci_dev *dev, int irq,
|
||||
struct ht_irq_msg *msg);
|
||||
|
||||
struct ht_irq_cfg {
|
||||
struct pci_dev *dev;
|
||||
/* Update callback used to cope with buggy hardware */
|
||||
ht_irq_update_t *update;
|
||||
unsigned pos;
|
||||
unsigned idx;
|
||||
struct ht_irq_msg msg;
|
||||
};
|
||||
|
||||
/* Helper functions.. */
|
||||
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
|
||||
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
|
||||
void mask_ht_irq(struct irq_data *data);
|
||||
void unmask_ht_irq(struct irq_data *data);
|
||||
|
||||
/* The arch hook for getting things started */
|
||||
int arch_setup_ht_irq(int idx, int pos, struct pci_dev *dev,
|
||||
ht_irq_update_t *update);
|
||||
void arch_teardown_ht_irq(unsigned int irq);
|
||||
|
||||
/* For drivers of buggy hardware */
|
||||
int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update);
|
||||
|
||||
#endif /* LINUX_HTIRQ_H */
|
||||
|
|
@ -1484,12 +1484,6 @@ static inline void pcie_set_ecrc_checking(struct pci_dev *dev) { }
|
|||
static inline void pcie_ecrc_get_policy(char *str) { }
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_HT_IRQ
|
||||
/* The functions a driver should call */
|
||||
int ht_create_irq(struct pci_dev *dev, int idx);
|
||||
void ht_destroy_irq(unsigned int irq);
|
||||
#endif /* CONFIG_HT_IRQ */
|
||||
|
||||
#ifdef CONFIG_PCI_ATS
|
||||
/* Address Translation Service */
|
||||
void pci_ats_init(struct pci_dev *dev);
|
||||
|
|
|
|||
Loading…
Reference in New Issue