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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] First fast hyperprivop support (hyper_rfi)
ChangeSet 1.1509.1.5, 2005/05/26 09:43:04-06:00, djm@xxxxxxxxxxxxxxx
First fast hyperprivop support (hyper_rfi)
Signed-off by: Dan Magenheimer <dan.magenheimer@xxxxxx>
arch/ia64/Makefile | 2
arch/ia64/asm-offsets.c | 7 ++
arch/ia64/hyperprivop.S | 103 +++++++++++++++++++++++++++++++++++++++++++
arch/ia64/ivt.S | 13 +++++
arch/ia64/privop.c | 2
include/asm-ia64/xensystem.h | 2
include/public/arch-ia64.h | 7 ++
7 files changed, 132 insertions(+), 4 deletions(-)
diff -Nru a/xen/arch/ia64/Makefile b/xen/arch/ia64/Makefile
--- a/xen/arch/ia64/Makefile 2005-05-26 14:01:42 -04:00
+++ b/xen/arch/ia64/Makefile 2005-05-26 14:01:42 -04:00
@@ -9,7 +9,7 @@
xenmem.o sal.o cmdline.o mm_init.o tlb.o smpboot.o \
extable.o linuxextable.o xenirq.o xentime.o \
regionreg.o entry.o unaligned.o privop.o vcpu.o \
- irq_ia64.o irq_lsapic.o vhpt.o xenasm.o dom_fw.o
+ irq_ia64.o irq_lsapic.o vhpt.o xenasm.o hyperprivop.o dom_fw.o
ifeq ($(CONFIG_VTI),y)
OBJS += vmx_init.o vmx_virt.o vmx_vcpu.o vmx_process.o vmx_vsa.o vmx_ivt.o \
diff -Nru a/xen/arch/ia64/asm-offsets.c b/xen/arch/ia64/asm-offsets.c
--- a/xen/arch/ia64/asm-offsets.c 2005-05-26 14:01:42 -04:00
+++ b/xen/arch/ia64/asm-offsets.c 2005-05-26 14:01:42 -04:00
@@ -44,6 +44,13 @@
DEFINE(XSI_PSR_IC_OFS, offsetof(vcpu_info_t,
arch.interrupt_collection_enabled));
DEFINE(XSI_PSR_IC, (SHAREDINFO_ADDR+offsetof(vcpu_info_t,
arch.interrupt_collection_enabled)));
DEFINE(XSI_PSR_I_OFS, offsetof(vcpu_info_t,
arch.interrupt_delivery_enabled));
+ DEFINE(XSI_IIP_OFS, offsetof(vcpu_info_t, arch.iip));
+ DEFINE(XSI_IPSR_OFS, offsetof(vcpu_info_t, arch.ipsr));
+ DEFINE(XSI_IFS_OFS, offsetof(vcpu_info_t, arch.ifs));
+ DEFINE(XSI_BANKNUM_OFS, offsetof(vcpu_info_t, arch.banknum));
+ DEFINE(XSI_METAPHYS_OFS, offsetof(vcpu_info_t, arch.metaphysical_mode));
+ DEFINE(XSI_INCOMPL_REG_OFS, offsetof(vcpu_info_t,
arch.incomplete_regframe));
+ DEFINE(XSI_PEND_OFS, offsetof(vcpu_info_t, arch.pending_interruption));
//DEFINE(IA64_TASK_BLOCKED_OFFSET,offsetof (struct task_struct,
blocked));
//DEFINE(IA64_TASK_CLEAR_CHILD_TID_OFFSET,offsetof (struct task_struct,
clear_child_tid));
//DEFINE(IA64_TASK_GROUP_LEADER_OFFSET, offsetof (struct task_struct,
group_leader));
diff -Nru a/xen/arch/ia64/hyperprivop.S b/xen/arch/ia64/hyperprivop.S
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/xen/arch/ia64/hyperprivop.S 2005-05-26 14:01:42 -04:00
@@ -0,0 +1,103 @@
+/*
+ * arch/ia64/kernel/hyperprivop.S
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ * Dan Magenheimer <dan.magenheimer@xxxxxx>
+ */
+
+#include <linux/config.h>
+
+#include <asm/asmmacro.h>
+#include <asm/kregs.h>
+#include <asm/offsets.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <public/arch-ia64.h>
+
+// Note: not hand-scheduled for now
+// Registers at entry
+// r16 == cr.isr
+// r17 == cr.iim
+// r18 == XSI_PSR_IC_OFS
+// r19 == vpsr.ic (low 32 bits) | vpsr.i (high 32 bits)
+// r31 == pr
+GLOBAL_ENTRY(fast_hyperprivop)
+ //cover;;
+ // if domain interrupts pending, give up for now and do it the slow way
+ adds r20=XSI_PEND_OFS-XSI_PSR_IC_OFS,r18 ;;
+ ld8 r20=[r20] ;;
+ cmp.ne p7,p0=r0,r20
+(p7) br.sptk.many dispatch_break_fault ;;
+
+ // HYPERPRIVOP_RFI?
+ cmp.eq p7,p6=XEN_HYPER_RFI,r17
+(p7) br.sptk.many hyper_rfi;;
+ // if not rfi, give up for now and do it the slow way
+ br.sptk.many dispatch_break_fault ;;
+
+// ensure that, if giving up, registers at entry to fast_hyperprivop unchanged
+ENTRY(hyper_rfi)
+ adds r20=XSI_IPSR_OFS-XSI_PSR_IC_OFS,r18 ;;
+ ld8 r21=[r20];; // r21 = vcr.ipsr
+ extr.u r22=r21,IA64_PSR_BE_BIT,1 ;;
+ // if turning on psr.be, give up for now and do it the slow way
+ cmp.ne p7,p0=r22,r0
+(p7) br.sptk.many dispatch_break_fault ;;
+ // if (!(vpsr.dt && vpsr.rt && vpsr.it)), do it the slow way
+ movl r20=(IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_IT);;
+ and r22=r20,r21
+ ;;
+ cmp.ne p7,p0=r22,r20
+(p7) br.sptk.many dispatch_break_fault ;;
+ // if was in metaphys mode, do it the slow way (FIXME later?)
+ adds r20=XSI_METAPHYS_OFS-XSI_PSR_IC_OFS,r18 ;;
+ ld4 r20=[r20];;
+ cmp.ne p7,p0=r20,r0
+(p7) br.sptk.many dispatch_break_fault ;;
+ // if domain hasn't already done virtual bank switch
+ // do it the slow way (FIXME later?)
+ adds r20=XSI_BANKNUM_OFS-XSI_PSR_IC_OFS,r18 ;;
+ ld4 r20=[r20];;
+ cmp.eq p7,p0=r20,r0
+(p7) br.sptk.many dispatch_break_fault ;;
+ // validate vcr.iip, if in Xen range, do it the slow way
+ adds r20=XSI_IIP_OFS-XSI_PSR_IC_OFS,r18 ;;
+ ld8 r22=[r20];;
+ movl r23=XEN_VIRT_SPACE_LOW
+ movl r24=XEN_VIRT_SPACE_HIGH ;;
+ cmp.ltu p0,p7=r22,r23 ;; // if !(iip<low) &&
+(p7) cmp.geu p0,p7=r22,r24 ;; // !(iip>=high)
+(p7) br.sptk.many dispatch_break_fault ;;
+
+ // OK now, let's do an rfi.
+ // r18=&vpsr.i|vpsr.ic, r21==vpsr, r20==&vcr.iip, r22=vcr.iip
+ mov cr.iip=r22;;
+ adds r20=XSI_INCOMPL_REG_OFS-XSI_PSR_IC_OFS,r18 ;;
+ st4 [r20]=r0 ;;
+ adds r20=XSI_IFS_OFS-XSI_PSR_IC_OFS,r18 ;;
+ ld8 r20=[r20];;
+ dep r20=0,r20,38,25;; // ensure ifs has no reserved bits set
+ mov cr.ifs=r20 ;;
+// TODO: increment a counter so we can count how many rfi's go the fast way
+// but where? counter must be pinned
+ // ipsr.cpl == (vcr.ipsr.cpl == 0) 2 : 3;
+ dep r21=-1,r21,IA64_PSR_CPL1_BIT,1 ;;
+ // vpsr.i = vcr.ipsr.i; vpsr.ic = vcr.ipsr.ic
+ mov r19=r0 ;;
+ extr.u r22=r21,IA64_PSR_I_BIT,1 ;;
+ cmp.ne p7,p6=r22,r0 ;;
+(p7) dep r19=-1,r19,32,1
+ extr.u r22=r21,IA64_PSR_IC_BIT,1 ;;
+ cmp.ne p7,p6=r22,r0 ;;
+(p7) dep r19=-1,r19,0,1 ;;
+ st8 [r18]=r19 ;;
+ // force on psr.ic, i, dt, rt, it, bn
+ movl
r20=(IA64_PSR_I|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_IT|IA64_PSR_BN)
+ ;;
+ or r21=r21,r20
+ ;;
+ mov cr.ipsr=r21
+ mov pr=r31,-1
+ ;;
+ rfi
+ ;;
diff -Nru a/xen/arch/ia64/ivt.S b/xen/arch/ia64/ivt.S
--- a/xen/arch/ia64/ivt.S 2005-05-26 14:01:42 -04:00
+++ b/xen/arch/ia64/ivt.S 2005-05-26 14:01:42 -04:00
@@ -792,6 +792,7 @@
// Later, they will be fast hand-coded assembly with psr.ic off
// which means no calls, no use of r1-r15 and no memory accesses
// except to pinned addresses!
+#define FAST_HYPERPRIVOPS
#ifdef FAST_HYPERPRIVOPS
br.sptk.many fast_hyperprivop
#else
@@ -917,9 +918,10 @@
// fault ever gets "unreserved", simply moved the following code to a
more
// suitable spot...
-ENTRY(dispatch_break_fault)
+GLOBAL_ENTRY(dispatch_break_fault)
SAVE_MIN_WITH_COVER
;;
+dispatch_break_fault_post_save:
alloc r14=ar.pfs,0,0,4,0 // now it's safe (must be first in insn group!)
mov out0=cr.ifa
adds out1=16,sp
@@ -1796,6 +1798,15 @@
mov rp=r14
br.sptk.many ia64_prepare_handle_reflection
END(dispatch_reflection)
+
+#define SAVE_MIN_COVER_DONE DO_SAVE_MIN(,mov r30=cr.ifs,)
+
+// same as dispatch_break_fault except cover has already been done
+GLOBAL_ENTRY(dispatch_slow_hyperprivop)
+ SAVE_MIN_COVER_DONE
+ ;;
+ br.sptk.many dispatch_break_fault_post_save
+END(dispatch_slow_hyperprivop)
#endif
#ifdef CONFIG_IA32_SUPPORT
diff -Nru a/xen/arch/ia64/privop.c b/xen/arch/ia64/privop.c
--- a/xen/arch/ia64/privop.c 2005-05-26 14:01:42 -04:00
+++ b/xen/arch/ia64/privop.c 2005-05-26 14:01:42 -04:00
@@ -981,7 +981,7 @@
{
int i;
char *s = buf;
- s += sprintf(s,"Hyperprivops:\n");
+ s += sprintf(s,"Slow hyperprivops:\n");
for (i = 1; i <= HYPERPRIVOP_MAX; i++)
if (hyperpriv_cnt[i])
s += sprintf(s,"%10d %s\n",
diff -Nru a/xen/include/asm-ia64/xensystem.h b/xen/include/asm-ia64/xensystem.h
--- a/xen/include/asm-ia64/xensystem.h 2005-05-26 14:01:42 -04:00
+++ b/xen/include/asm-ia64/xensystem.h 2005-05-26 14:01:42 -04:00
@@ -14,10 +14,10 @@
#include <linux/kernel.h>
/* Define HV space hierarchy */
-#ifdef CONFIG_VTI
#define XEN_VIRT_SPACE_LOW 0xe800000000000000
#define XEN_VIRT_SPACE_HIGH 0xf800000000000000
/* This is address to mapping rr7 switch stub, in region 5 */
+#ifdef CONFIG_VTI
#define XEN_RR7_SWITCH_STUB 0xb700000000000000
#endif // CONFIG_VTI
diff -Nru a/xen/include/public/arch-ia64.h b/xen/include/public/arch-ia64.h
--- a/xen/include/public/arch-ia64.h 2005-05-26 14:01:42 -04:00
+++ b/xen/include/public/arch-ia64.h 2005-05-26 14:01:42 -04:00
@@ -81,4 +81,11 @@
#endif /* !__ASSEMBLY__ */
+#define XEN_HYPER_RFI 1
+#define XEN_HYPER_RSM_PSR_DT 2
+#define XEN_HYPER_SSM_PSR_DT 3
+#define XEN_HYPER_COVER 4
+#define XEN_HYPER_ITC_D 5
+#define XEN_HYPER_ITC_I 6
+
#endif /* __HYPERVISOR_IF_IA64_H__ */
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