| Message ID | 20240201010453.2212371-6-peter.hilber@opensynergy.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | treewide: Use clocksource ID for get_device_system_crosststamp() | expand |
On Thu, 01 Feb 2024 01:04:50 +0000, Peter Hilber <peter.hilber@opensynergy.com> wrote: > > Identify the clocksources used by ptp_kvm by setting clocksource ID enum > constants. This avoids dereferencing struct clocksource. Once the > system_counterval_t.cs member will be removed, this will also avoid the > need to obtain clocksource pointers from kvm_arch_ptp_get_crosststamp(). > > The clocksource IDs are associated to timestamps requested from the KVM > hypervisor, so the proper clocksource ID is known at the ptp_kvm request > site. > > While at it, also rectify the ptp_kvm_get_time_fn() ret type. Not sure what is wrong with that return type, but this patch doesn't seem to affect it. M.
On 01.02.24 14:52, Marc Zyngier wrote: > On Thu, 01 Feb 2024 01:04:50 +0000, > Peter Hilber <peter.hilber@opensynergy.com> wrote: >> >> Identify the clocksources used by ptp_kvm by setting clocksource ID enum >> constants. This avoids dereferencing struct clocksource. Once the >> system_counterval_t.cs member will be removed, this will also avoid the >> need to obtain clocksource pointers from kvm_arch_ptp_get_crosststamp(). >> >> The clocksource IDs are associated to timestamps requested from the KVM >> hypervisor, so the proper clocksource ID is known at the ptp_kvm request >> site. >> >> While at it, also rectify the ptp_kvm_get_time_fn() ret type. > > Not sure what is wrong with that return type, but this patch doesn't > seem to affect it. > I meant to refer to the type of the variable ret declared in ptp_kvm_get_time_fn(). I will reword the commit message to make this clear. Thanks for the comment, Peter
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index e054de92de91..45a02872669e 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -1807,7 +1807,8 @@ TIMER_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init); #endif int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *ts, - struct clocksource **cs) + struct clocksource **cs, + enum clocksource_ids *cs_id) { struct arm_smccc_res hvc_res; u32 ptp_counter; @@ -1833,6 +1834,8 @@ int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *ts, *cycle = (u64)hvc_res.a2 << 32 | hvc_res.a3; if (cs) *cs = &clocksource_counter; + if (cs_id) + *cs_id = CSID_ARM_ARCH_COUNTER; return 0; } diff --git a/drivers/ptp/ptp_kvm_arm.c b/drivers/ptp/ptp_kvm_arm.c index e68e6943167b..017bb5f03b14 100644 --- a/drivers/ptp/ptp_kvm_arm.c +++ b/drivers/ptp/ptp_kvm_arm.c @@ -28,5 +28,5 @@ void kvm_arch_ptp_exit(void) int kvm_arch_ptp_get_clock(struct timespec64 *ts) { - return kvm_arch_ptp_get_crosststamp(NULL, ts, NULL); + return kvm_arch_ptp_get_crosststamp(NULL, ts, NULL, NULL); } diff --git a/drivers/ptp/ptp_kvm_common.c b/drivers/ptp/ptp_kvm_common.c index b0b36f135347..f6683ba0ab3c 100644 --- a/drivers/ptp/ptp_kvm_common.c +++ b/drivers/ptp/ptp_kvm_common.c @@ -4,7 +4,6 @@ * * Copyright (C) 2017 Red Hat Inc. */ -#include <linux/clocksource.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> @@ -29,15 +28,16 @@ static int ptp_kvm_get_time_fn(ktime_t *device_time, struct system_counterval_t *system_counter, void *ctx) { - long ret; - u64 cycle; + enum clocksource_ids cs_id; struct timespec64 tspec; struct clocksource *cs; + u64 cycle; + int ret; spin_lock(&kvm_ptp_lock); preempt_disable_notrace(); - ret = kvm_arch_ptp_get_crosststamp(&cycle, &tspec, &cs); + ret = kvm_arch_ptp_get_crosststamp(&cycle, &tspec, &cs, &cs_id); if (ret) { spin_unlock(&kvm_ptp_lock); preempt_enable_notrace(); @@ -48,7 +48,7 @@ static int ptp_kvm_get_time_fn(ktime_t *device_time, system_counter->cycles = cycle; system_counter->cs = cs; - system_counter->cs_id = cs->id; + system_counter->cs_id = cs_id; *device_time = timespec64_to_ktime(tspec); diff --git a/drivers/ptp/ptp_kvm_x86.c b/drivers/ptp/ptp_kvm_x86.c index 902844cc1a17..2782442922cb 100644 --- a/drivers/ptp/ptp_kvm_x86.c +++ b/drivers/ptp/ptp_kvm_x86.c @@ -93,7 +93,8 @@ int kvm_arch_ptp_get_clock(struct timespec64 *ts) } int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *tspec, - struct clocksource **cs) + struct clocksource **cs, + enum clocksource_ids *cs_id) { struct pvclock_vcpu_time_info *src; unsigned int version; @@ -124,6 +125,7 @@ int kvm_arch_ptp_get_crosststamp(u64 *cycle, struct timespec64 *tspec, } while (pvclock_read_retry(src, version)); *cs = &kvm_clock; + *cs_id = CSID_X86_KVM_CLK; return 0; } diff --git a/include/linux/ptp_kvm.h b/include/linux/ptp_kvm.h index 746fd67c3480..95b3d4d0d7dd 100644 --- a/include/linux/ptp_kvm.h +++ b/include/linux/ptp_kvm.h @@ -8,6 +8,7 @@ #ifndef _PTP_KVM_H_ #define _PTP_KVM_H_ +#include <linux/clocksource_ids.h> #include <linux/types.h> struct timespec64; @@ -17,6 +18,7 @@ int kvm_arch_ptp_init(void); void kvm_arch_ptp_exit(void); int kvm_arch_ptp_get_clock(struct timespec64 *ts); int kvm_arch_ptp_get_crosststamp(u64 *cycle, - struct timespec64 *tspec, struct clocksource **cs); + struct timespec64 *tspec, struct clocksource **cs, + enum clocksource_ids *cs_id); #endif /* _PTP_KVM_H_ */
Identify the clocksources used by ptp_kvm by setting clocksource ID enum constants. This avoids dereferencing struct clocksource. Once the system_counterval_t.cs member will be removed, this will also avoid the need to obtain clocksource pointers from kvm_arch_ptp_get_crosststamp(). The clocksource IDs are associated to timestamps requested from the KVM hypervisor, so the proper clocksource ID is known at the ptp_kvm request site. While at it, also rectify the ptp_kvm_get_time_fn() ret type. Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com> --- Notes: v2: Added in v2. drivers/clocksource/arm_arch_timer.c | 5 ++++- drivers/ptp/ptp_kvm_arm.c | 2 +- drivers/ptp/ptp_kvm_common.c | 10 +++++----- drivers/ptp/ptp_kvm_x86.c | 4 +++- include/linux/ptp_kvm.h | 4 +++- 5 files changed, 16 insertions(+), 9 deletions(-)