svn commit: r310101 - in head: include sys/dev/hyperv/include sys/dev/hyperv/vmbus sys/dev/hyperv/vmbus/amd64
Sepherosa Ziehau
sephe at FreeBSD.org
Thu Dec 15 03:32:25 UTC 2016
Author: sephe
Date: Thu Dec 15 03:32:24 2016
New Revision: 310101
URL: https://svnweb.freebsd.org/changeset/base/310101
Log:
hyperv: Allow userland to ro-mmap reference TSC page
This paves way to implement VDSO for the enlightened time counter.
Reviewed by: kib
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8768
Modified:
head/include/Makefile
head/sys/dev/hyperv/include/hyperv.h
head/sys/dev/hyperv/vmbus/amd64/hyperv_machdep.c
head/sys/dev/hyperv/vmbus/hyperv_reg.h
Modified: head/include/Makefile
==============================================================================
--- head/include/Makefile Thu Dec 15 02:05:29 2016 (r310100)
+++ head/include/Makefile Thu Dec 15 03:32:24 2016 (r310101)
@@ -185,6 +185,9 @@ copies: .PHONY .META
${DESTDIR}${INCLUDEDIR}/dev/evdev; \
${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 uinput.h \
${DESTDIR}${INCLUDEDIR}/dev/evdev
+ cd ${.CURDIR}/../sys/dev/hyperv/include; \
+ ${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 hyperv.h \
+ ${DESTDIR}${INCLUDEDIR}/dev/hyperv
cd ${.CURDIR}/../sys/dev/hyperv/utilities; \
${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 hv_snapshot.h \
${DESTDIR}${INCLUDEDIR}/dev/hyperv
@@ -293,6 +296,11 @@ symlinks: .PHONY .META
ln -fs ../../../../sys/dev/evdev/$$h \
${DESTDIR}${INCLUDEDIR}/dev/evdev; \
done
+ cd ${.CURDIR}/../sys/dev/hyperv/include; \
+ for h in hyperv.h; do \
+ ${INSTALL_SYMLINK} ${TAG_ARGS} ../../../../sys/dev/hyperv/include/$$h \
+ ${DESTDIR}${INCLUDEDIR}/dev/hyperv; \
+ done
cd ${.CURDIR}/../sys/dev/hyperv/utilities; \
for h in hv_snapshot.h; do \
${INSTALL_SYMLINK} ${TAG_ARGS} ../../../../sys/dev/hyperv/utilities/$$h \
Modified: head/sys/dev/hyperv/include/hyperv.h
==============================================================================
--- head/sys/dev/hyperv/include/hyperv.h Thu Dec 15 02:05:29 2016 (r310100)
+++ head/sys/dev/hyperv/include/hyperv.h Thu Dec 15 03:32:24 2016 (r310101)
@@ -31,10 +31,10 @@
#ifndef _HYPERV_H_
#define _HYPERV_H_
-#include <sys/param.h>
+#ifdef _KERNEL
-#include <vm/vm.h>
-#include <vm/pmap.h>
+#include <sys/param.h>
+#include <sys/systm.h>
#define MSR_HV_TIME_REF_COUNT 0x40000020
@@ -54,14 +54,35 @@
#define HYPERV_TIMER_NS_FACTOR 100ULL
#define HYPERV_TIMER_FREQ (NANOSEC / HYPERV_TIMER_NS_FACTOR)
+#endif /* _KERNEL */
+
+#define HYPERV_REFTSC_DEVNAME "hv_tsc"
+
+/*
+ * Hyper-V Reference TSC
+ */
+struct hyperv_reftsc {
+ volatile uint32_t tsc_seq;
+ volatile uint32_t tsc_rsvd1;
+ volatile uint64_t tsc_scale;
+ volatile int64_t tsc_ofs;
+} __packed __aligned(PAGE_SIZE);
+#ifdef CTASSERT
+CTASSERT(sizeof(struct hyperv_reftsc) == PAGE_SIZE);
+#endif
+
+#ifdef _KERNEL
+
struct hyperv_guid {
- uint8_t hv_guid[16];
+ uint8_t hv_guid[16];
} __packed;
-#define HYPERV_GUID_STRLEN 40
+#define HYPERV_GUID_STRLEN 40
int hyperv_guid2str(const struct hyperv_guid *, char *, size_t);
extern u_int hyperv_features; /* CPUID_HV_MSR_ */
+#endif /* _KERNEL */
+
#endif /* _HYPERV_H_ */
Modified: head/sys/dev/hyperv/vmbus/amd64/hyperv_machdep.c
==============================================================================
--- head/sys/dev/hyperv/vmbus/amd64/hyperv_machdep.c Thu Dec 15 02:05:29 2016 (r310100)
+++ head/sys/dev/hyperv/vmbus/amd64/hyperv_machdep.c Thu Dec 15 03:32:24 2016 (r310101)
@@ -28,6 +28,8 @@
__FBSDID("$FreeBSD$");
#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/timetc.h>
@@ -35,6 +37,9 @@ __FBSDID("$FreeBSD$");
#include <machine/cpufunc.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
+#include <machine/specialreg.h>
+
+#include <vm/vm.h>
#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/include/hyperv_busdma.h>
@@ -47,6 +52,9 @@ struct hyperv_reftsc_ctx {
struct hyperv_dma tsc_ref_dma;
};
+static d_open_t hyperv_tsc_open;
+static d_mmap_t hyperv_tsc_mmap;
+
static struct timecounter hyperv_tsc_timecounter = {
.tc_get_timecount = NULL, /* based on CPU vendor. */
.tc_poll_pps = NULL,
@@ -58,6 +66,13 @@ static struct timecounter hyperv_tsc_tim
.tc_priv = NULL
};
+static struct cdevsw hyperv_tsc_cdevsw = {
+ .d_version = D_VERSION,
+ .d_open = hyperv_tsc_open,
+ .d_mmap = hyperv_tsc_mmap,
+ .d_name = HYPERV_REFTSC_DEVNAME
+};
+
static struct hyperv_reftsc_ctx hyperv_ref_tsc;
uint64_t
@@ -72,6 +87,36 @@ hypercall_md(volatile void *hc_addr, uin
return (status);
}
+static int
+hyperv_tsc_open(struct cdev *dev __unused, int oflags, int devtype __unused,
+ struct thread *td __unused)
+{
+
+ if (oflags & FWRITE)
+ return (EPERM);
+ return (0);
+}
+
+static int
+hyperv_tsc_mmap(struct cdev *dev __unused, vm_ooffset_t offset,
+ vm_paddr_t *paddr, int nprot __unused, vm_memattr_t *memattr __unused)
+{
+
+ KASSERT(hyperv_ref_tsc.tsc_ref != NULL, ("reftsc has not been setup"));
+
+ /*
+ * NOTE:
+ * 'nprot' does not contain information interested to us;
+ * WR-open is blocked by d_open.
+ */
+
+ if (offset != 0)
+ return (EOPNOTSUPP);
+
+ *paddr = hyperv_ref_tsc.tsc_ref_dma.hv_paddr;
+ return (0);
+}
+
#define HYPERV_TSC_TIMECOUNT(fence) \
static u_int \
hyperv_tsc_timecount_##fence(struct timecounter *tc) \
@@ -150,6 +195,10 @@ hyperv_tsc_tcinit(void *dummy __unused)
/* Register "enlightened" timecounter. */
tc_init(&hyperv_tsc_timecounter);
+
+ /* Add device for mmap(2). */
+ make_dev(&hyperv_tsc_cdevsw, 0, UID_ROOT, GID_WHEEL, 0444,
+ HYPERV_REFTSC_DEVNAME);
}
SYSINIT(hyperv_tsc_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, hyperv_tsc_tcinit,
NULL);
Modified: head/sys/dev/hyperv/vmbus/hyperv_reg.h
==============================================================================
--- head/sys/dev/hyperv/vmbus/hyperv_reg.h Thu Dec 15 02:05:29 2016 (r310100)
+++ head/sys/dev/hyperv/vmbus/hyperv_reg.h Thu Dec 15 03:32:24 2016 (r310101)
@@ -129,17 +129,6 @@
#define CPUID_LEAF_HV_HWFEATURES 0x40000006
/*
- * Hyper-V Reference TSC
- */
-struct hyperv_reftsc {
- volatile uint32_t tsc_seq;
- volatile uint32_t tsc_rsvd1;
- volatile uint64_t tsc_scale;
- volatile int64_t tsc_ofs;
-} __packed __aligned(PAGE_SIZE);
-CTASSERT(sizeof(struct hyperv_reftsc) == PAGE_SIZE);
-
-/*
* Hyper-V Monitor Notification Facility
*/
struct hyperv_mon_param {
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