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[155.4.131.235]) by smtp.gmail.com with ESMTPSA id sg8sm562643lbb.28.2016.05.17.07.46.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 17 May 2016 07:46:35 -0700 (PDT) From: Ola Liljedahl To: lng-odp@lists.linaro.org Date: Tue, 17 May 2016 16:46:29 +0200 Message-Id: <1463496389-17373-3-git-send-email-ola.liljedahl@linaro.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1463496389-17373-1-git-send-email-ola.liljedahl@linaro.org> References: <1463496389-17373-1-git-send-email-ola.liljedahl@linaro.org> X-Topics: timers patch Subject: [lng-odp] [PATCH 2/2] linux-generic: timer: fix failed static assert X-BeenThere: lng-odp@lists.linaro.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: "The OpenDataPlane \(ODP\) List" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: lng-odp-bounces@lists.linaro.org Sender: "lng-odp" (This document/code contribution attached is provided under the terms of agreement LES-LTM-21309) Ensure tick_buf_t structure is max 128 bits large on all platforms, regardless of support for 64-bit atomic operations. Only assert that tick_buf_t is 128 bits large when performing atomic operations on it (requires ODP and platform support for 128 bit atomics). Signed-off-by: Ola Liljedahl --- platform/linux-generic/odp_timer.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/platform/linux-generic/odp_timer.c b/platform/linux-generic/odp_timer.c index 66a25b8..613d342 100644 --- a/platform/linux-generic/odp_timer.c +++ b/platform/linux-generic/odp_timer.c @@ -94,7 +94,15 @@ static odp_timeout_hdr_t *timeout_hdr(odp_timeout_t tmo) *****************************************************************************/ typedef struct tick_buf_s { +#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2 + /* No atomics support for 64-bit variables, will use separate lock */ + /* Use the same layout as odp_atomic_u64_t but without lock variable */ + struct { + uint64_t v; + } exp_tck;/* Expiration tick or TMO_xxx */ +#else odp_atomic_u64_t exp_tck;/* Expiration tick or TMO_xxx */ +#endif odp_buffer_t tmo_buf;/* ODP_BUFFER_INVALID if timer not active */ #ifdef TB_NEEDS_PAD uint32_t pad;/* Need to be able to access padding for successful CAS */ @@ -105,7 +113,10 @@ ODP_ALIGNED(16) /* 16-byte atomic operations need properly aligned addresses */ #endif ; +#if __GCC_ATOMIC_LLONG_LOCK_FREE >= 2 +/* Only assert this when we perform atomic operations on tick_buf_t */ _ODP_STATIC_ASSERT(sizeof(tick_buf_t) == 16, "sizeof(tick_buf_t) == 16"); +#endif typedef struct odp_timer_s { void *user_ptr; @@ -123,7 +134,11 @@ static void timer_init(odp_timer *tim, /* All pad fields need a defined and constant value */ TB_SET_PAD(*tb); /* Release the timer by setting timer state to inactive */ +#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2 + tb->exp_tck.v = TMO_INACTIVE; +#else _odp_atomic_u64_store_mm(&tb->exp_tck, TMO_INACTIVE, _ODP_MEMMODEL_RLS); +#endif } /* Teardown when timer is freed */ @@ -253,7 +268,11 @@ static odp_timer_pool *odp_timer_pool_new( tp->timers[i].queue = ODP_QUEUE_INVALID; set_next_free(&tp->timers[i], i + 1); tp->timers[i].user_ptr = NULL; +#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2 + tp->tick_buf[i].exp_tck.v = TMO_UNUSED; +#else odp_atomic_init_u64(&tp->tick_buf[i].exp_tck, TMO_UNUSED); +#endif tp->tick_buf[i].tmo_buf = ODP_BUFFER_INVALID; } tp->tp_idx = tp_idx; @@ -920,7 +939,11 @@ int odp_timeout_fresh(odp_timeout_t tmo) odp_timer_pool *tp = handle_to_tp(hdl); uint32_t idx = handle_to_idx(hdl, tp); tick_buf_t *tb = &tp->tick_buf[idx]; +#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2 + uint64_t exp_tck = tb->exp_tck.v; +#else uint64_t exp_tck = odp_atomic_load_u64(&tb->exp_tck); +#endif /* Return true if the timer still has the same expiration tick * (ignoring the inactive/expired bit) as the timeout */ return hdr->expiration == (exp_tck & ~TMO_INACTIVE);