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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * vSMPowered(tm) systems specific initialization
- * Copyright (C) 2005 ScaleMP Inc.
- *
- * Ravikiran Thirumalai <[email protected]>,
- * Shai Fultheim <[email protected]>
- * Paravirt ops integration: Glauber de Oliveira Costa <[email protected]>,
- * Ravikiran Thirumalai <[email protected]>
- */
- #include <linux/init.h>
- #include <linux/pci_ids.h>
- #include <linux/pci_regs.h>
- #include <linux/smp.h>
- #include <linux/irq.h>
- #include <asm/apic.h>
- #include <asm/pci-direct.h>
- #include <asm/io.h>
- #include <asm/paravirt.h>
- #include <asm/setup.h>
- #define TOPOLOGY_REGISTER_OFFSET 0x10
- #ifdef CONFIG_PCI
- static void __init set_vsmp_ctl(void)
- {
- void __iomem *address;
- unsigned int cap, ctl, cfg;
- /* set vSMP magic bits to indicate vSMP capable kernel */
- cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
- address = early_ioremap(cfg, 8);
- cap = readl(address);
- ctl = readl(address + 4);
- printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
- cap, ctl);
- /* If possible, let the vSMP foundation route the interrupt optimally */
- #ifdef CONFIG_SMP
- if (cap & ctl & BIT(8)) {
- ctl &= ~BIT(8);
- #ifdef CONFIG_PROC_FS
- /* Don't let users change irq affinity via procfs */
- no_irq_affinity = 1;
- #endif
- }
- #endif
- writel(ctl, address + 4);
- ctl = readl(address + 4);
- pr_info("vSMP CTL: control set to:0x%08x\n", ctl);
- early_iounmap(address, 8);
- }
- static int is_vsmp = -1;
- static void __init detect_vsmp_box(void)
- {
- is_vsmp = 0;
- if (!early_pci_allowed())
- return;
- /* Check if we are running on a ScaleMP vSMPowered box */
- if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) ==
- (PCI_VENDOR_ID_SCALEMP | (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16)))
- is_vsmp = 1;
- }
- static int is_vsmp_box(void)
- {
- if (is_vsmp != -1)
- return is_vsmp;
- else {
- WARN_ON_ONCE(1);
- return 0;
- }
- }
- #else
- static void __init detect_vsmp_box(void)
- {
- }
- static int is_vsmp_box(void)
- {
- return 0;
- }
- static void __init set_vsmp_ctl(void)
- {
- }
- #endif
- static void __init vsmp_cap_cpus(void)
- {
- #if !defined(CONFIG_X86_VSMP) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
- void __iomem *address;
- unsigned int cfg, topology, node_shift, maxcpus;
- /*
- * CONFIG_X86_VSMP is not configured, so limit the number CPUs to the
- * ones present in the first board, unless explicitly overridden by
- * setup_max_cpus
- */
- if (setup_max_cpus != NR_CPUS)
- return;
- /* Read the vSMP Foundation topology register */
- cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
- address = early_ioremap(cfg + TOPOLOGY_REGISTER_OFFSET, 4);
- if (WARN_ON(!address))
- return;
- topology = readl(address);
- node_shift = (topology >> 16) & 0x7;
- if (!node_shift)
- /* The value 0 should be decoded as 8 */
- node_shift = 8;
- maxcpus = (topology & ((1 << node_shift) - 1)) + 1;
- pr_info("vSMP CTL: Capping CPUs to %d (CONFIG_X86_VSMP is unset)\n",
- maxcpus);
- setup_max_cpus = maxcpus;
- early_iounmap(address, 4);
- #endif
- }
- static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
- {
- return hard_smp_processor_id() >> index_msb;
- }
- static void vsmp_apic_post_init(void)
- {
- /* need to update phys_pkg_id */
- apic->phys_pkg_id = apicid_phys_pkg_id;
- }
- void __init vsmp_init(void)
- {
- detect_vsmp_box();
- if (!is_vsmp_box())
- return;
- x86_platform.apic_post_init = vsmp_apic_post_init;
- vsmp_cap_cpus();
- set_vsmp_ctl();
- return;
- }
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