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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2015-11-05 15:15:07 +0000
committerDavid Vrabel <david.vrabel@citrix.com>2015-12-21 14:40:52 +0000
commit4ccefbe597392d2914cf7ad904e33c734972681d (patch)
tree45a0530808bd128eec2b545c546d2265ff601dfb /arch/x86/xen/time.c
parent4ef7675344d687a0ef5b0d7c0cee12da005870c0 (diff)
downloadlinux-4ccefbe597392d2914cf7ad904e33c734972681d.tar.bz2
xen: move xen_setup_runstate_info and get_runstate_snapshot to drivers/xen/time.c
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/time.c')
-rw-r--r--arch/x86/xen/time.c76
1 files changed, 1 insertions, 75 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index f1ba6a092854..041d4cda3939 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -32,86 +32,12 @@
#define TIMER_SLOP 100000
#define NS_PER_TICK (1000000000LL / HZ)
-/* runstate info updated by Xen */
-static DEFINE_PER_CPU(struct vcpu_runstate_info, xen_runstate);
-
/* snapshots of runstate info */
static DEFINE_PER_CPU(struct vcpu_runstate_info, xen_runstate_snapshot);
/* unused ns of stolen time */
static DEFINE_PER_CPU(u64, xen_residual_stolen);
-/* return an consistent snapshot of 64-bit time/counter value */
-static u64 get64(const u64 *p)
-{
- u64 ret;
-
- if (BITS_PER_LONG < 64) {
- u32 *p32 = (u32 *)p;
- u32 h, l;
-
- /*
- * Read high then low, and then make sure high is
- * still the same; this will only loop if low wraps
- * and carries into high.
- * XXX some clean way to make this endian-proof?
- */
- do {
- h = p32[1];
- barrier();
- l = p32[0];
- barrier();
- } while (p32[1] != h);
-
- ret = (((u64)h) << 32) | l;
- } else
- ret = *p;
-
- return ret;
-}
-
-/*
- * Runstate accounting
- */
-static void get_runstate_snapshot(struct vcpu_runstate_info *res)
-{
- u64 state_time;
- struct vcpu_runstate_info *state;
-
- BUG_ON(preemptible());
-
- state = this_cpu_ptr(&xen_runstate);
-
- /*
- * The runstate info is always updated by the hypervisor on
- * the current CPU, so there's no need to use anything
- * stronger than a compiler barrier when fetching it.
- */
- do {
- state_time = get64(&state->state_entry_time);
- barrier();
- *res = *state;
- barrier();
- } while (get64(&state->state_entry_time) != state_time);
-}
-
-/* return true when a vcpu could run but has no real cpu to run on */
-bool xen_vcpu_stolen(int vcpu)
-{
- return per_cpu(xen_runstate, vcpu).state == RUNSTATE_runnable;
-}
-
-void xen_setup_runstate_info(int cpu)
-{
- struct vcpu_register_runstate_memory_area area;
-
- area.addr.v = &per_cpu(xen_runstate, cpu);
-
- if (HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area,
- cpu, &area))
- BUG();
-}
-
static void do_stolen_accounting(void)
{
struct vcpu_runstate_info state;
@@ -119,7 +45,7 @@ static void do_stolen_accounting(void)
s64 runnable, offline, stolen;
cputime_t ticks;
- get_runstate_snapshot(&state);
+ xen_get_runstate_snapshot(&state);
WARN_ON(state.state != RUNSTATE_running);