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Fri, 13 Aug 2021 14:12:36 -0700 (PDT) Date: Fri, 13 Aug 2021 21:12:05 +0000 In-Reply-To: <20210813211211.2983293-1-rananta@google.com> Message-Id: <20210813211211.2983293-5-rananta@google.com> Mime-Version: 1.0 References: <20210813211211.2983293-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.rc1.237.g0d66db33f3-goog Subject: [PATCH 04/10] KVM: arm64: selftests: Add basic support for arch_timers From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier X-Mailman-Approved-At: Sun, 15 Aug 2021 13:01:04 -0400 Cc: kvm@vger.kernel.org, Peter Shier , Raghavendra Rao Anata , kvmarm@lists.cs.columbia.edu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Add a minimalistic library support to access the virtual timers, that can be used for simple timing functionalities, such as introducing delays in the guest. Signed-off-by: Raghavendra Rao Ananta --- .../kvm/include/aarch64/arch_timer.h | 138 ++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h new file mode 100644 index 000000000000..e6144ab95348 --- /dev/null +++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h @@ -0,0 +1,138 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * ARM Generic Interrupt Controller (GIC) specific defines + */ + +#ifndef SELFTEST_KVM_ARCH_TIMER_H +#define SELFTEST_KVM_ARCH_TIMER_H + +#include + +#include "processor.h" + +enum arch_timer { + VIRTUAL, + PHYSICAL, +}; + +#define CTL_ENABLE (1 << 0) +#define CTL_ISTATUS (1 << 2) +#define CTL_IMASK (1 << 1) + +#define msec_to_cycles(msec) \ + (timer_get_cntfrq() * (uint64_t)(msec) / 1000) + +#define usec_to_cycles(usec) \ + (timer_get_cntfrq() * (uint64_t)(usec) / 1000000) + +#define cycles_to_usec(cycles) \ + ((uint64_t)(cycles) * 1000000 / timer_get_cntfrq()) + +static inline uint32_t timer_get_cntfrq(void) +{ + return read_sysreg(cntfrq_el0); +} + +static inline uint64_t timer_get_cntct(enum arch_timer timer) +{ + isb(); + + switch (timer) { + case VIRTUAL: + return read_sysreg(cntvct_el0); + case PHYSICAL: + return read_sysreg(cntpct_el0); + default: + GUEST_ASSERT_1(0, timer); + } + + /* We should not reach here */ + return 0; +} + +static inline void timer_set_cval(enum arch_timer timer, uint64_t cval) +{ + switch (timer) { + case VIRTUAL: + return write_sysreg(cntv_cval_el0, cval); + case PHYSICAL: + return write_sysreg(cntp_cval_el0, cval); + default: + GUEST_ASSERT_1(0, timer); + } + + isb(); +} + +static inline uint64_t timer_get_cval(enum arch_timer timer) +{ + switch (timer) { + case VIRTUAL: + return read_sysreg(cntv_cval_el0); + case PHYSICAL: + return read_sysreg(cntp_cval_el0); + default: + GUEST_ASSERT_1(0, timer); + } + + /* We should not reach here */ + return 0; +} + +static inline void timer_set_tval(enum arch_timer timer, uint32_t tval) +{ + switch (timer) { + case VIRTUAL: + return write_sysreg(cntv_tval_el0, tval); + case PHYSICAL: + return write_sysreg(cntp_tval_el0, tval); + default: + GUEST_ASSERT_1(0, timer); + } + + isb(); +} + +static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl) +{ + switch (timer) { + case VIRTUAL: + return write_sysreg(cntv_ctl_el0, ctl); + case PHYSICAL: + return write_sysreg(cntp_ctl_el0, ctl); + default: + GUEST_ASSERT_1(0, timer); + } + + isb(); +} + +static inline uint32_t timer_get_ctl(enum arch_timer timer) +{ + switch (timer) { + case VIRTUAL: + return read_sysreg(cntv_ctl_el0); + case PHYSICAL: + return read_sysreg(cntp_ctl_el0); + default: + GUEST_ASSERT_1(0, timer); + } + + /* We should not reach here */ + return 0; +} + +static inline void timer_set_next_cval_ms(enum arch_timer timer, uint32_t msec) +{ + uint64_t now_ct = timer_get_cntct(timer); + uint64_t next_ct = now_ct + msec_to_cycles(msec); + + timer_set_cval(timer, next_ct); +} + +static inline void timer_set_next_tval_ms(enum arch_timer timer, uint32_t msec) +{ + timer_set_tval(timer, msec_to_cycles(msec)); +} + +#endif /* SELFTEST_KVM_ARCH_TIMER_H */ -- 2.33.0.rc1.237.g0d66db33f3-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm