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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0637a70a5d
Some buggy systems can machine check when config space accesses happen for some non existent devices. i386/x86-64 do some early device scans that might trigger this. Allow pci=noearly to disable this. Also when type 1 is disabling also don't do any early accesses which are always type1. This moves the pci= configuration parsing to be a early parameter. I don't think this can break anything because it only changes a single global that is only used by PCI. Cc: gregkh@suse.de Cc: Trammell Hudson <hudson@osresearch.net> Signed-off-by: Andi Kleen <ak@suse.de>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/*
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* vSMPowered(tm) systems specific initialization
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* Copyright (C) 2005 ScaleMP Inc.
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*
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* Use of this code is subject to the terms and conditions of the
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* GNU general public license version 2. See "COPYING" or
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* http://www.gnu.org/licenses/gpl.html
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*
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* Ravikiran Thirumalai <kiran@scalemp.com>,
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* Shai Fultheim <shai@scalemp.com>
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*/
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#include <linux/init.h>
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#include <linux/pci_ids.h>
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#include <linux/pci_regs.h>
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#include <asm/pci-direct.h>
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static int __init vsmp_init(void)
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{
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void *address;
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unsigned int cap, ctl;
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if (!early_pci_allowed())
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return 0;
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/* Check if we are running on a ScaleMP vSMP box */
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if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) != PCI_VENDOR_ID_SCALEMP) ||
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(read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) != PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
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return 0;
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/* set vSMP magic bits to indicate vSMP capable kernel */
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address = ioremap(read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0), 8);
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cap = readl(address);
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ctl = readl(address + 4);
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printk("vSMP CTL: capabilities:0x%08x control:0x%08x\n", cap, ctl);
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if (cap & ctl & (1 << 4)) {
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/* Turn on vSMP IRQ fastpath handling (see system.h) */
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ctl &= ~(1 << 4);
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writel(ctl, address + 4);
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ctl = readl(address + 4);
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printk("vSMP CTL: control set to:0x%08x\n", ctl);
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}
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iounmap(address);
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return 0;
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}
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core_initcall(vsmp_init);
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