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([94.75.70.14]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5297066b249sm1344203e87.178.2024.05.29.12.55.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 May 2024 12:55:15 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 5e624e07-1df5-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1717012515; x=1717617315; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5j/RmSAlhCXJU1vUCQMT/ujGfnXfs53M7nbtzjes1TI=; b=fEUhk5AA8ukCLPi7XQ2/NiqZL+ep3PgY6SLKzfRFoN1Ujeyophk2ftajYp5oyr/FUB KaUQsk6i2vEWk2Q1CJ2J6jx/V/ESUXfVEAav7eSpNFaNKKVgvpfNrVKZGwMRzh6OPWE3 VRFUQasY09XWkdfdq0iC78BTWlZDNAGdNf5m2Oy+WQryFb5IosO/xkHu6M2LoDRvycQY FfJ2CQQOM1UM/v1iDd54C1/dRBeq87X0Jqz02yLF+xTwCC7DWsZYSwZ5D2mQGGH6MCLV YSxNjBAH9Zq4IZrIt+Ctlo98jUiAMRvoCu/VtPO6KfaQCzDOHS/yejHr9xoNe1boBpqp Ljtw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717012515; x=1717617315; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5j/RmSAlhCXJU1vUCQMT/ujGfnXfs53M7nbtzjes1TI=; b=kBQxKH8TZKI8yuefj7eIHjF4MpnOqi6tCj1X8TNLZx/jSDoAEXpT0BZm2JYrVC35gL ZtXG9SNSovJHjgDT0TsLRVX+0HlTo5CNm3rwPfnsmLGtbsD/9ZAVCF3eu4vzvtz0TW5m F85LMKBHvGjgWo0YVvyXL59+2mhdcwX5PrDSuRWel105srLzPBBfQiEDUFbQpAGPYd/l 03b8YbK8Edb0xyHXoufed4oQnzZ319fePGDep50clSiZV/ZDQ64W+dg/bp+M5/0SI+2z kbn1AG9wGEqcXp4KO46IN8vN3g1BpXpiMqVXSsUBDRy3Vt0VYXhOoTrSA8wkNs5LER75 WFEg== X-Gm-Message-State: AOJu0Yz7gmJnk4ougoN37KtlgI7JV9B9v7Do2vKKUVcBxree66niXr0V fYPRJt0MM2JMGZYUBg69Mfjpdn1BWZfrGQN0ALiA1yJgZxX3c+CRbiJNqJNh X-Google-Smtp-Source: AGHT+IHsKzwdLJDunzsII+Oo8Y+RSm0pjg/FSCmVV8H2Jruqwk6TXnOHVvqxpsKkabpyMwtmcSKuRg== X-Received: by 2002:a19:ca06:0:b0:518:dae6:d0ec with SMTP id 2adb3069b0e04-52b7d418d7amr115370e87.4.1717012515204; Wed, 29 May 2024 12:55:15 -0700 (PDT) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Oleksii Kurochko , Alistair Francis , Bob Eshleman , Connor Davis , Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [PATCH v12 3/8] xen/riscv: introduce bitops.h Date: Wed, 29 May 2024 21:55:04 +0200 Message-ID: X-Mailer: git-send-email 2.45.0 In-Reply-To: References: MIME-Version: 1.0 Taken from Linux-6.4.0-rc1 Xen's bitops.h consists of several Linux's headers: * linux/arch/include/asm/bitops.h: * The following function were removed as they aren't used in Xen: * test_and_set_bit_lock * clear_bit_unlock * __clear_bit_unlock * The following functions were renamed in the way how they are used by common code: * __test_and_set_bit * __test_and_clear_bit * The declaration and implementation of the following functios were updated to make Xen build happy: * clear_bit * set_bit * __test_and_clear_bit * __test_and_set_bit Signed-off-by: Oleksii Kurochko Acked-by: Jan Beulich --- Changes in V11-V12: - Nothing changed. Only rebase was done. --- Changes in V10: - update the error message BITS_PER_LONG -> BITOP_BITS_PER_WORD --- Changes in V9: - add Acked-by: Jan Beulich - drop redefinition of bitop_uint_t in asm/types.h as some operation in Xen common code expects to work with 32-bit quantities. - s/BITS_PER_LONG/BITOP_BITS_PER_WORD in asm/bitops.h around __AMO() macros. --- Changes in V8: - define bitop_uint_t in after the changes in patch related to introduction of "introduce generic non-atomic test_*bit()". - drop duplicated __set_bit() and __clear_bit(). - drop duplicated comment: /* Based on linux/arch/include/asm/bitops.h */. - update type of res and mask in test_and_op_bit_ord(): unsigned long -> bitop_uint_t. - drop 1 padding blank in test_and_op_bit_ord(). - update definition of test_and_set_bit(),test_and_clear_bit(),test_and_change_bit: change return type to bool. - change addr argument type of test_and_change_bit(): unsigned long * -> void *. - move test_and_change_bit() closer to other test_and-s function. - Code style fixes: tabs -> space. - s/#undef __op_bit/#undef op_bit. - update the commit message: delete information about generic-non-atomic.h changes as now it is a separate patch. --- Changes in V7: - Update the commit message. - Drop "__" for __op_bit and __op_bit_ord as they are atomic. - add comment above __set_bit and __clear_bit about why they are defined as atomic. - align bitops_uint_t with __AMO(). - make changes after generic non-atomic test_*bit() were changed. - s/__asm__ __volatile__/asm volatile --- Changes in V6: - rebase clean ups were done: drop unused asm-generic includes --- Changes in V5: - new patch --- xen/arch/riscv/include/asm/bitops.h | 137 ++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 xen/arch/riscv/include/asm/bitops.h diff --git a/xen/arch/riscv/include/asm/bitops.h b/xen/arch/riscv/include/asm/bitops.h new file mode 100644 index 0000000000..7f7af3fda1 --- /dev/null +++ b/xen/arch/riscv/include/asm/bitops.h @@ -0,0 +1,137 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (C) 2012 Regents of the University of California */ + +#ifndef _ASM_RISCV_BITOPS_H +#define _ASM_RISCV_BITOPS_H + +#include + +#if BITOP_BITS_PER_WORD == 64 +#define __AMO(op) "amo" #op ".d" +#elif BITOP_BITS_PER_WORD == 32 +#define __AMO(op) "amo" #op ".w" +#else +#error "Unexpected BITOP_BITS_PER_WORD" +#endif + +/* Based on linux/arch/include/asm/bitops.h */ + +/* + * Non-atomic bit manipulation. + * + * Implemented using atomics to be interrupt safe. Could alternatively + * implement with local interrupt masking. + */ +#define __set_bit(n, p) set_bit(n, p) +#define __clear_bit(n, p) clear_bit(n, p) + +#define test_and_op_bit_ord(op, mod, nr, addr, ord) \ +({ \ + bitop_uint_t res, mask; \ + mask = BITOP_MASK(nr); \ + asm volatile ( \ + __AMO(op) #ord " %0, %2, %1" \ + : "=r" (res), "+A" (addr[BITOP_WORD(nr)]) \ + : "r" (mod(mask)) \ + : "memory"); \ + ((res & mask) != 0); \ +}) + +#define op_bit_ord(op, mod, nr, addr, ord) \ + asm volatile ( \ + __AMO(op) #ord " zero, %1, %0" \ + : "+A" (addr[BITOP_WORD(nr)]) \ + : "r" (mod(BITOP_MASK(nr))) \ + : "memory"); + +#define test_and_op_bit(op, mod, nr, addr) \ + test_and_op_bit_ord(op, mod, nr, addr, .aqrl) +#define op_bit(op, mod, nr, addr) \ + op_bit_ord(op, mod, nr, addr, ) + +/* Bitmask modifiers */ +#define NOP(x) (x) +#define NOT(x) (~(x)) + +/** + * test_and_set_bit - Set a bit and return its old value + * @nr: Bit to set + * @addr: Address to count from + */ +static inline bool test_and_set_bit(int nr, volatile void *p) +{ + volatile bitop_uint_t *addr = p; + + return test_and_op_bit(or, NOP, nr, addr); +} + +/** + * test_and_clear_bit - Clear a bit and return its old value + * @nr: Bit to clear + * @addr: Address to count from + */ +static inline bool test_and_clear_bit(int nr, volatile void *p) +{ + volatile bitop_uint_t *addr = p; + + return test_and_op_bit(and, NOT, nr, addr); +} + +/** + * test_and_change_bit - Toggle (change) a bit and return its old value + * @nr: Bit to change + * @addr: Address to count from + * + * This operation is atomic and cannot be reordered. + * It also implies a memory barrier. + */ +static inline bool test_and_change_bit(int nr, volatile void *p) +{ + volatile bitop_uint_t *addr = p; + + return test_and_op_bit(xor, NOP, nr, addr); +} + +/** + * set_bit - Atomically set a bit in memory + * @nr: the bit to set + * @addr: the address to start counting from + * + * Note that @nr may be almost arbitrarily large; this function is not + * restricted to acting on a single-word quantity. + */ +static inline void set_bit(int nr, volatile void *p) +{ + volatile bitop_uint_t *addr = p; + + op_bit(or, NOP, nr, addr); +} + +/** + * clear_bit - Clears a bit in memory + * @nr: Bit to clear + * @addr: Address to start counting from + */ +static inline void clear_bit(int nr, volatile void *p) +{ + volatile bitop_uint_t *addr = p; + + op_bit(and, NOT, nr, addr); +} + +#undef test_and_op_bit +#undef op_bit +#undef NOP +#undef NOT +#undef __AMO + +#endif /* _ASM_RISCV_BITOPS_H */ + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */