mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 18:10:52 +07:00
70511134f6
Partial revert of commit 129d8bc828
titled 'x86: don't compile vsmp_64 for 32bit'
Commit reverted to compile vsmp_64.c if CONFIG_X86_64 is defined,
since is_vsmp_box() needs to indicate that TSCs are not synchronized, and
hence, not a valid time source, even when CONFIG_X86_VSMP is not defined.
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: shai@scalex86.org
LKML-Reference: <20090324061429.GH7278@localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
/*
|
|
* vSMPowered(tm) systems specific initialization
|
|
* Copyright (C) 2005 ScaleMP Inc.
|
|
*
|
|
* Use of this code is subject to the terms and conditions of the
|
|
* GNU general public license version 2. See "COPYING" or
|
|
* http://www.gnu.org/licenses/gpl.html
|
|
*
|
|
* Ravikiran Thirumalai <kiran@scalemp.com>,
|
|
* Shai Fultheim <shai@scalemp.com>
|
|
* Paravirt ops integration: Glauber de Oliveira Costa <gcosta@redhat.com>,
|
|
* Ravikiran Thirumalai <kiran@scalemp.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/pci_ids.h>
|
|
#include <linux/pci_regs.h>
|
|
|
|
#include <asm/apic.h>
|
|
#include <asm/pci-direct.h>
|
|
#include <asm/io.h>
|
|
#include <asm/paravirt.h>
|
|
#include <asm/setup.h>
|
|
|
|
#if defined CONFIG_PCI && defined CONFIG_PARAVIRT
|
|
/*
|
|
* Interrupt control on vSMPowered systems:
|
|
* ~AC is a shadow of IF. If IF is 'on' AC should be 'off'
|
|
* and vice versa.
|
|
*/
|
|
|
|
static unsigned long vsmp_save_fl(void)
|
|
{
|
|
unsigned long flags = native_save_fl();
|
|
|
|
if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
|
|
flags &= ~X86_EFLAGS_IF;
|
|
return flags;
|
|
}
|
|
PV_CALLEE_SAVE_REGS_THUNK(vsmp_save_fl);
|
|
|
|
static void vsmp_restore_fl(unsigned long flags)
|
|
{
|
|
if (flags & X86_EFLAGS_IF)
|
|
flags &= ~X86_EFLAGS_AC;
|
|
else
|
|
flags |= X86_EFLAGS_AC;
|
|
native_restore_fl(flags);
|
|
}
|
|
PV_CALLEE_SAVE_REGS_THUNK(vsmp_restore_fl);
|
|
|
|
static void vsmp_irq_disable(void)
|
|
{
|
|
unsigned long flags = native_save_fl();
|
|
|
|
native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
|
|
}
|
|
PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_disable);
|
|
|
|
static void vsmp_irq_enable(void)
|
|
{
|
|
unsigned long flags = native_save_fl();
|
|
|
|
native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
|
|
}
|
|
PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_enable);
|
|
|
|
static unsigned __init_or_module vsmp_patch(u8 type, u16 clobbers, void *ibuf,
|
|
unsigned long addr, unsigned len)
|
|
{
|
|
switch (type) {
|
|
case PARAVIRT_PATCH(pv_irq_ops.irq_enable):
|
|
case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
|
|
case PARAVIRT_PATCH(pv_irq_ops.save_fl):
|
|
case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
|
|
return paravirt_patch_default(type, clobbers, ibuf, addr, len);
|
|
default:
|
|
return native_patch(type, clobbers, ibuf, addr, len);
|
|
}
|
|
|
|
}
|
|
|
|
static void __init set_vsmp_pv_ops(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 (cap & ctl & (1 << 4)) {
|
|
/* Setup irq ops and turn on vSMP IRQ fastpath handling */
|
|
pv_irq_ops.irq_disable = PV_CALLEE_SAVE(vsmp_irq_disable);
|
|
pv_irq_ops.irq_enable = PV_CALLEE_SAVE(vsmp_irq_enable);
|
|
pv_irq_ops.save_fl = PV_CALLEE_SAVE(vsmp_save_fl);
|
|
pv_irq_ops.restore_fl = PV_CALLEE_SAVE(vsmp_restore_fl);
|
|
pv_init_ops.patch = vsmp_patch;
|
|
|
|
ctl &= ~(1 << 4);
|
|
writel(ctl, address + 4);
|
|
ctl = readl(address + 4);
|
|
printk(KERN_INFO "vSMP CTL: control set to:0x%08x\n", ctl);
|
|
}
|
|
|
|
early_iounmap(address, 8);
|
|
}
|
|
#else
|
|
static void __init set_vsmp_pv_ops(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PCI
|
|
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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
}
|
|
int is_vsmp_box(void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
void __init vsmp_init(void)
|
|
{
|
|
detect_vsmp_box();
|
|
if (!is_vsmp_box())
|
|
return;
|
|
|
|
set_vsmp_pv_ops();
|
|
return;
|
|
}
|