This patch makes vsmp a paravirt client. It now uses the whole
infrastructure provided by pvops. When we detect we're running
a vsmp box, we change the irq-related paravirt operations (and so,
it have to happen quite early), and the patching function
Signed-off-by: Glauber de Oliveira Costa <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Acked-by: Jeremy Fitzhardinge <[email protected]>
---
arch/x86/Kconfig.x86_64 | 3 +-
arch/x86/kernel/setup_64.c | 3 ++
arch/x86/kernel/vsmp_64.c | 72 +++++++++++++++++++++++++++++++++++++++----
include/asm-x86/setup.h | 3 +-
4 files changed, 71 insertions(+), 10 deletions(-)
diff --git a/arch/x86/Kconfig.x86_64 b/arch/x86/Kconfig.x86_64
index 04734dd..544bad5 100644
--- a/arch/x86/Kconfig.x86_64
+++ b/arch/x86/Kconfig.x86_64
@@ -148,15 +148,14 @@ config X86_PC
bool "PC-compatible"
help
Choose this option if your computer is a standard PC or compatible.
-
config X86_VSMP
bool "Support for ScaleMP vSMP"
depends on PCI
+ select PARAVIRT
help
Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
supposed to run on these EM64T-based machines. Only choose this option
if you have one of these machines.
-
endchoice
choice
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 44a11e3..c522549 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -335,6 +335,9 @@ void __init setup_arch(char **cmdline_p)
init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
+#ifdef CONFIG_VSMP
+ vsmp_init();
+#endif
dmi_scan_machine();
#ifdef CONFIG_SMP
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 414caf0..547d3b3 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -8,18 +8,70 @@
*
* Ravikiran Thirumalai <[email protected]>,
* Shai Fultheim <[email protected]>
+ * Paravirt ops integration: Glauber de Oliveira Costa <[email protected]>
*/
-
#include <linux/init.h>
#include <linux/pci_ids.h>
#include <linux/pci_regs.h>
#include <asm/pci-direct.h>
#include <asm/io.h>
+#include <asm/paravirt.h>
+
+/*
+ * Interrupt control for the VSMP architecture:
+ */
+
+static inline unsigned long vsmp_save_fl(void)
+{
+ unsigned long flags = native_save_fl();
+
+ if (flags & X86_EFLAGS_IF)
+ return X86_EFLAGS_IF;
+ return 0;
+}
-static int __init vsmp_init(void)
+static inline void vsmp_restore_fl(unsigned long flags)
+{
+ if (flags & X86_EFLAGS_IF)
+ flags &= ~X86_EFLAGS_AC;
+ if (!(flags & X86_EFLAGS_IF))
+ flags &= X86_EFLAGS_AC;
+ native_restore_fl(flags);
+}
+
+static inline void vsmp_irq_disable(void)
+{
+ unsigned long flags = native_save_fl();
+
+ vsmp_restore_fl((flags & ~X86_EFLAGS_IF));
+}
+
+static inline void vsmp_irq_enable(void)
+{
+ unsigned long flags = native_save_fl();
+
+ vsmp_restore_fl((flags | X86_EFLAGS_IF));
+}
+
+static unsigned __init 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);
+ }
+
+}
+
+int __init vsmp_init(void)
{
void *address;
- unsigned int cap, ctl;
+ unsigned int cap, ctl, cfg;
if (!early_pci_allowed())
return 0;
@@ -29,8 +81,16 @@ static int __init vsmp_init(void)
(read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) != PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
return 0;
+ /* If we are, use the distinguished irq functions */
+ pv_irq_ops.irq_disable = vsmp_irq_disable;
+ pv_irq_ops.irq_enable = vsmp_irq_enable;
+ pv_irq_ops.save_fl = vsmp_save_fl;
+ pv_irq_ops.restore_fl = vsmp_restore_fl;
+ pv_init_ops.patch = vsmp_patch;
+
/* set vSMP magic bits to indicate vSMP capable kernel */
- address = ioremap(read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0), 8);
+ cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
+ address = early_ioremap(cfg, 8);
cap = readl(address);
ctl = readl(address + 4);
printk("vSMP CTL: capabilities:0x%08x control:0x%08x\n", cap, ctl);
@@ -42,8 +102,6 @@ static int __init vsmp_init(void)
printk("vSMP CTL: control set to:0x%08x\n", ctl);
}
- iounmap(address);
+ early_iounmap(address, 8);
return 0;
}
-
-core_initcall(vsmp_init);
diff --git a/include/asm-x86/setup.h b/include/asm-x86/setup.h
index 071e054..dd7996c 100644
--- a/include/asm-x86/setup.h
+++ b/include/asm-x86/setup.h
@@ -58,7 +58,8 @@ void __init add_memory_region(unsigned long long start,
extern unsigned long init_pg_tables_end;
-
+/* For EM64T-based VSMP machines */
+int vsmp_init(void);
#endif /* __i386__ */
#endif /* _SETUP */
--
1.4.4.2
-
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