From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 405DDA0C45; Wed, 27 Oct 2021 10:10:35 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 02AA8410E0; Wed, 27 Oct 2021 10:10:35 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id 8FCD1410DC for ; Wed, 27 Oct 2021 10:10:31 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 06B99106F; Wed, 27 Oct 2021 01:10:31 -0700 (PDT) Received: from net-x86-dell-8268.shanghai.arm.com (net-x86-dell-8268.shanghai.arm.com [10.169.210.103]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 7196A3F70D; Wed, 27 Oct 2021 01:10:29 -0700 (PDT) From: Feifei Wang To: Ruifeng Wang Cc: dev@dpdk.org, nd@arm.com, Feifei Wang Date: Wed, 27 Oct 2021 16:10:15 +0800 Message-Id: <20211027081018.653746-2-feifei.wang2@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211027081018.653746-1-feifei.wang2@arm.com> References: <20210902053253.3017858-1-feifei.wang2@arm.com> <20211027081018.653746-1-feifei.wang2@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-dev] [PATCH v6 1/4] eal: add new definitions for wait scheme X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Introduce macros as generic interface for address monitoring. For different size, encapsulate '__LOAD_EXC_16', '__LOAD_EXC_32' and '__LOAD_EXC_64' into a new macro '__LOAD_EXC'. Furthermore, to prevent compilation warning in arm: ---------------------------------------------- 'warning: implicit declaration of function ...' ---------------------------------------------- Delete 'undef' constructions for '__LOAD_EXC_xx', '__SEVL' and '__WFE'. This is because original macros are undefine at the end of the file. If new macro 'rte_wait_event' calls them in other files, they will be seen as 'not defined'. Signed-off-by: Feifei Wang Reviewed-by: Ruifeng Wang --- lib/eal/arm/include/rte_pause_64.h | 136 ++++++++++++++++------------ lib/eal/include/generic/rte_pause.h | 28 ++++++ 2 files changed, 107 insertions(+), 57 deletions(-) diff --git a/lib/eal/arm/include/rte_pause_64.h b/lib/eal/arm/include/rte_pause_64.h index e87d10b8cc..87df224ac1 100644 --- a/lib/eal/arm/include/rte_pause_64.h +++ b/lib/eal/arm/include/rte_pause_64.h @@ -31,20 +31,12 @@ static inline void rte_pause(void) /* Put processor into low power WFE(Wait For Event) state. */ #define __WFE() { asm volatile("wfe" : : : "memory"); } -static __rte_always_inline void -rte_wait_until_equal_16(volatile uint16_t *addr, uint16_t expected, - int memorder) -{ - uint16_t value; - - assert(memorder == __ATOMIC_ACQUIRE || memorder == __ATOMIC_RELAXED); - - /* - * Atomic exclusive load from addr, it returns the 16-bit content of - * *addr while making it 'monitored',when it is written by someone - * else, the 'monitored' state is cleared and a event is generated - * implicitly to exit WFE. - */ +/* + * Atomic exclusive load from addr, it returns the 16-bit content of + * *addr while making it 'monitored', when it is written by someone + * else, the 'monitored' state is cleared and an event is generated + * implicitly to exit WFE. + */ #define __LOAD_EXC_16(src, dst, memorder) { \ if (memorder == __ATOMIC_RELAXED) { \ asm volatile("ldxrh %w[tmp], [%x[addr]]" \ @@ -58,6 +50,62 @@ rte_wait_until_equal_16(volatile uint16_t *addr, uint16_t expected, : "memory"); \ } } +/* + * Atomic exclusive load from addr, it returns the 32-bit content of + * *addr while making it 'monitored', when it is written by someone + * else, the 'monitored' state is cleared and an event is generated + * implicitly to exit WFE. + */ +#define __LOAD_EXC_32(src, dst, memorder) { \ + if (memorder == __ATOMIC_RELAXED) { \ + asm volatile("ldxr %w[tmp], [%x[addr]]" \ + : [tmp] "=&r" (dst) \ + : [addr] "r"(src) \ + : "memory"); \ + } else { \ + asm volatile("ldaxr %w[tmp], [%x[addr]]" \ + : [tmp] "=&r" (dst) \ + : [addr] "r"(src) \ + : "memory"); \ + } } + +/* + * Atomic exclusive load from addr, it returns the 64-bit content of + * *addr while making it 'monitored', when it is written by someone + * else, the 'monitored' state is cleared and an event is generated + * implicitly to exit WFE. + */ +#define __LOAD_EXC_64(src, dst, memorder) { \ + if (memorder == __ATOMIC_RELAXED) { \ + asm volatile("ldxr %x[tmp], [%x[addr]]" \ + : [tmp] "=&r" (dst) \ + : [addr] "r"(src) \ + : "memory"); \ + } else { \ + asm volatile("ldaxr %x[tmp], [%x[addr]]" \ + : [tmp] "=&r" (dst) \ + : [addr] "r"(src) \ + : "memory"); \ + } } + +#define __LOAD_EXC(src, dst, memorder, size) { \ + assert(size == 16 || size == 32 || size == 64); \ + if (size == 16) \ + __LOAD_EXC_16(src, dst, memorder) \ + else if (size == 32) \ + __LOAD_EXC_32(src, dst, memorder) \ + else if (size == 64) \ + __LOAD_EXC_64(src, dst, memorder) \ +} + +static __rte_always_inline void +rte_wait_until_equal_16(volatile uint16_t *addr, uint16_t expected, + int memorder) +{ + uint16_t value; + + assert(memorder == __ATOMIC_ACQUIRE || memorder == __ATOMIC_RELAXED); + __LOAD_EXC_16(addr, value, memorder) if (value != expected) { __SEVL() @@ -66,7 +114,6 @@ rte_wait_until_equal_16(volatile uint16_t *addr, uint16_t expected, __LOAD_EXC_16(addr, value, memorder) } while (value != expected); } -#undef __LOAD_EXC_16 } static __rte_always_inline void @@ -77,25 +124,6 @@ rte_wait_until_equal_32(volatile uint32_t *addr, uint32_t expected, assert(memorder == __ATOMIC_ACQUIRE || memorder == __ATOMIC_RELAXED); - /* - * Atomic exclusive load from addr, it returns the 32-bit content of - * *addr while making it 'monitored',when it is written by someone - * else, the 'monitored' state is cleared and a event is generated - * implicitly to exit WFE. - */ -#define __LOAD_EXC_32(src, dst, memorder) { \ - if (memorder == __ATOMIC_RELAXED) { \ - asm volatile("ldxr %w[tmp], [%x[addr]]" \ - : [tmp] "=&r" (dst) \ - : [addr] "r"(src) \ - : "memory"); \ - } else { \ - asm volatile("ldaxr %w[tmp], [%x[addr]]" \ - : [tmp] "=&r" (dst) \ - : [addr] "r"(src) \ - : "memory"); \ - } } - __LOAD_EXC_32(addr, value, memorder) if (value != expected) { __SEVL() @@ -104,7 +132,6 @@ rte_wait_until_equal_32(volatile uint32_t *addr, uint32_t expected, __LOAD_EXC_32(addr, value, memorder) } while (value != expected); } -#undef __LOAD_EXC_32 } static __rte_always_inline void @@ -115,25 +142,6 @@ rte_wait_until_equal_64(volatile uint64_t *addr, uint64_t expected, assert(memorder == __ATOMIC_ACQUIRE || memorder == __ATOMIC_RELAXED); - /* - * Atomic exclusive load from addr, it returns the 64-bit content of - * *addr while making it 'monitored',when it is written by someone - * else, the 'monitored' state is cleared and a event is generated - * implicitly to exit WFE. - */ -#define __LOAD_EXC_64(src, dst, memorder) { \ - if (memorder == __ATOMIC_RELAXED) { \ - asm volatile("ldxr %x[tmp], [%x[addr]]" \ - : [tmp] "=&r" (dst) \ - : [addr] "r"(src) \ - : "memory"); \ - } else { \ - asm volatile("ldaxr %x[tmp], [%x[addr]]" \ - : [tmp] "=&r" (dst) \ - : [addr] "r"(src) \ - : "memory"); \ - } } - __LOAD_EXC_64(addr, value, memorder) if (value != expected) { __SEVL() @@ -143,10 +151,24 @@ rte_wait_until_equal_64(volatile uint64_t *addr, uint64_t expected, } while (value != expected); } } -#undef __LOAD_EXC_64 -#undef __SEVL -#undef __WFE +#define rte_wait_event(addr, mask, cond, expected, memorder) \ +do { \ + RTE_BUILD_BUG_ON(!__builtin_constant_p(memorder)); \ + RTE_BUILD_BUG_ON(memorder != __ATOMIC_ACQUIRE && \ + memorder != __ATOMIC_RELAXED); \ + uint32_t size = sizeof(*(addr)) << 3; \ + typeof(*(addr)) expected_value = (expected); \ + typeof(*(addr)) value = 0; \ + __LOAD_EXC((addr), value, memorder, size) \ + if ((value & (mask)) cond expected_value) { \ + __SEVL() \ + do { \ + __WFE() \ + __LOAD_EXC((addr), value, memorder, size) \ + } while ((value & (mask)) cond expected_value); \ + } \ +} while (0) #endif diff --git a/lib/eal/include/generic/rte_pause.h b/lib/eal/include/generic/rte_pause.h index 668ee4a184..d0c5b5a415 100644 --- a/lib/eal/include/generic/rte_pause.h +++ b/lib/eal/include/generic/rte_pause.h @@ -111,6 +111,34 @@ rte_wait_until_equal_64(volatile uint64_t *addr, uint64_t expected, while (__atomic_load_n(addr, memorder) != expected) rte_pause(); } + +/* + * Wait until *addr breaks the condition, with a relaxed memory + * ordering model meaning the loads around this API can be reordered. + * + * @param addr + * A pointer to the memory location. + * @param mask + * A mask of value bits in interest. + * @param cond + * A symbol representing the condition. + * @param expected + * An expected value to be in the memory location. + * @param memorder + * Two different memory orders that can be specified: + * __ATOMIC_ACQUIRE and __ATOMIC_RELAXED. These map to + * C++11 memory orders with the same names, see the C++11 standard or + * the GCC wiki on atomic synchronization for detailed definition. + */ +#define rte_wait_event(addr, mask, cond, expected, memorder) \ +do { \ + RTE_BUILD_BUG_ON(!__builtin_constant_p(memorder)); \ + RTE_BUILD_BUG_ON(memorder != __ATOMIC_ACQUIRE && \ + memorder != __ATOMIC_RELAXED); \ + typeof(*(addr)) expected_value = (expected); \ + while ((__atomic_load_n((addr), (memorder)) & (mask)) cond expected_value) \ + rte_pause(); \ +} while (0) #endif #endif /* _RTE_PAUSE_H_ */ -- 2.25.1