mirror of
https://github.com/torvalds/linux
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035fc90a9d
Now that the core code does not use this monstrosity anymore, it's time to put it to rest. The only real purpose was to read the APIC ID on UV and VSMP systems for the actual evaluation. That's what the core code does now. For doing the actual shift operation there is truly no APIC callback required. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Juergen Gross <jgross@suse.com> Tested-by: Sohil Mehta <sohil.mehta@intel.com> Tested-by: Michael Kelley <mhklinux@outlook.com> Tested-by: Zhang Rui <rui.zhang@intel.com> Tested-by: Wang Wendy <wendy.wang@intel.com> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com> Link: https://lore.kernel.org/r/20240212153625.516536121@linutronix.de
158 lines
3.1 KiB
C
158 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/init.h>
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#include <linux/thread_info.h>
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#include <asm/x86_init.h>
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#include <asm/apic.h>
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#include <asm/io_apic.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen.h>
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#include <xen/interface/physdev.h>
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#include "xen-ops.h"
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#include "pmu.h"
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#include "smp.h"
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static unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
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{
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struct physdev_apic apic_op;
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int ret;
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apic_op.apic_physbase = mpc_ioapic_addr(apic);
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apic_op.reg = reg;
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ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
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if (!ret)
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return apic_op.value;
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/* fallback to return an emulated IO_APIC values */
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if (reg == 0x1)
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return 0x00170020;
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else if (reg == 0x0)
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return apic << 24;
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return 0xfd;
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}
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static u32 xen_set_apic_id(u32 x)
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{
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WARN_ON(1);
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return x;
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}
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static u32 xen_get_apic_id(u32 x)
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{
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return ((x)>>24) & 0xFFu;
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}
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static u32 xen_apic_read(u32 reg)
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{
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struct xen_platform_op op = {
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.cmd = XENPF_get_cpuinfo,
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.interface_version = XENPF_INTERFACE_VERSION,
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.u.pcpu_info.xen_cpuid = 0,
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};
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int ret;
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/* Shouldn't need this as APIC is turned off for PV, and we only
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* get called on the bootup processor. But just in case. */
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if (!xen_initial_domain() || smp_processor_id())
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return 0;
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if (reg == APIC_LVR)
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return 0x14;
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if (reg != APIC_ID)
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return 0;
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ret = HYPERVISOR_platform_op(&op);
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if (ret)
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op.u.pcpu_info.apic_id = BAD_APICID;
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return op.u.pcpu_info.apic_id << 24;
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}
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static void xen_apic_write(u32 reg, u32 val)
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{
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if (reg == APIC_LVTPC) {
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(void)pmu_apic_update(reg);
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return;
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}
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/* Warn to see if there's any stray references */
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WARN(1,"register: %x, value: %x\n", reg, val);
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}
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static void xen_apic_eoi(void)
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{
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WARN_ON_ONCE(1);
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}
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static u64 xen_apic_icr_read(void)
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{
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return 0;
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}
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static void xen_apic_icr_write(u32 low, u32 id)
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{
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/* Warn to see if there's any stray references */
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WARN_ON(1);
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}
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static int xen_apic_probe_pv(void)
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{
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if (xen_pv_domain())
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return 1;
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return 0;
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}
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static int xen_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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return xen_pv_domain();
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}
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static u32 xen_cpu_present_to_apicid(int cpu)
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{
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if (cpu_present(cpu))
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return cpu_data(cpu).topo.apicid;
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else
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return BAD_APICID;
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}
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static struct apic xen_pv_apic __ro_after_init = {
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.name = "Xen PV",
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.probe = xen_apic_probe_pv,
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.acpi_madt_oem_check = xen_madt_oem_check,
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/* .delivery_mode and .dest_mode_logical not used by XENPV */
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.disable_esr = 0,
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.cpu_present_to_apicid = xen_cpu_present_to_apicid,
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.max_apic_id = UINT_MAX,
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.get_apic_id = xen_get_apic_id,
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.set_apic_id = xen_set_apic_id,
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.calc_dest_apicid = apic_flat_calc_apicid,
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#ifdef CONFIG_SMP
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.send_IPI_mask = xen_send_IPI_mask,
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.send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself,
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.send_IPI_allbutself = xen_send_IPI_allbutself,
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.send_IPI_all = xen_send_IPI_all,
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.send_IPI_self = xen_send_IPI_self,
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#endif
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.read = xen_apic_read,
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.write = xen_apic_write,
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.eoi = xen_apic_eoi,
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.icr_read = xen_apic_icr_read,
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.icr_write = xen_apic_icr_write,
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};
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apic_driver(xen_pv_apic);
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void __init xen_init_apic(void)
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{
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x86_apic_ops.io_apic_read = xen_io_apic_read;
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}
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