From patchwork Thu Jun 20 17:56:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13706224 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95D731B583B; Thu, 20 Jun 2024 17:57:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906234; cv=none; b=IV5oNt9rTBFrOOIFeUNuHVzq/YbBN4wqaT8gmNf6N9yYXa3IOyIbxs9PvSmTMtxY+IER6wQybArOQmO+iaaEIgetxxK330XfYFLa8IL3RjxqecmomNzMvmOT9lsd7OYNPp6vUXlhjWLSQJebgc1dS9GbMF83j7ebkymux/HFyWU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906234; c=relaxed/simple; bh=NJiSXR/2q9k2YAA0gEDwZCqD1aqsLC5sqUDA5CWKQZQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VkIFafNLrLI8S1P9g3VUjeNKg+ZLpIW3w84KBEOAPX1tJyam3kbrVrRVUdkOXba2UtZIZehybYvPY7G6sDWkhb/fx9WlLc+nlOfLt7VH8QkaHIh7m3aBacCqAa7BpXaxCAY5MufzxrezOeR2ic4j4lffjKtV1oaceggaRsGjPdA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=UEmSor8g; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="UEmSor8g" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-1f6a837e9a3so8127765ad.1; Thu, 20 Jun 2024 10:57:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718906232; x=1719511032; darn=vger.kernel.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=HgI5gEOuAZO9UYkmZKgqrzsmCGfdpvzU4+T+xEGqCGc=; b=UEmSor8gpsJWxrtWzxyHfWjhaYbI1h3q1L6shSKcG32gc31J0LUvUypWmTfNI80ahQ zgY2cL+Q3NtV3Z7kqPg5UcwEXmVsire7NaL3WMb2mtLaLbxH82jgBHQ/76l7OojHhh5J rBzo975VVn2Yj92aiiF9e4QPVkldTN7fSASVnd4+AUyqkU+uz+jEIKsN681OKNUFNSRD HarD+QtvPGas5G7xEpyHnABurCQrqYmoKxeCw4G4AbwObb9tBiGS1oGEjdG77/aC3X/M wL9UGZM1od3RvEX2HJWNtettC9qpi8wr7A1yQiiVzLHxAqjb1MIMiQaZgjYhTCSJ8h0+ /qjw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718906232; x=1719511032; 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=HgI5gEOuAZO9UYkmZKgqrzsmCGfdpvzU4+T+xEGqCGc=; b=qLaDBMQXNXHvma1DJ3WNbD3+rQys5b+VN1z6078l6EH8iIfOZSHYAc3DZgMkIAA7Yp 1gXQNOVAkh+iptgY4v52OR4gwj1irYncpuoyxATg/KYipdBUIoF6YQHAkcvmX1Enx001 4v3lgGqqVxAgsBzK2Af3LF9QfzKFqphzZSuNvwx43TyJmgiJWHOKBAW5YuWOPfiSWLjP 2efG2OEjxD0nQdrZ81gF4w4BCExQTz/mjhjxCDsP8Gn0hML9O00Z/lb5WXP+l25Py4Ai RsHaY8IIBRgg8GlOjsWZ5G7PPYHIWCKEsxa5C+psxwtEkhNNWCogsbMZD+yIqsBr1nzz BjLA== X-Forwarded-Encrypted: i=1; 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 X-Gm-Message-State: AOJu0YwlmbvP9FnD34/VHC7xRpiPfMI8dRbe6nth3LkPC0HwafJxa/Sd 5z0UyYnrn6vbvYC5hjlJiqEf1RcLAZvHcFxtzV73NrJ6xGE2gbvPctGBK1N4XH8= X-Google-Smtp-Source: AGHT+IELGiFFQYXDLuYwffpBy+2gvOLdiLXmpqp8gF/i2JmFW6wub2L8+md2wz99GOx5tRmisC4VJQ== X-Received: by 2002:a17:903:2445:b0:1f9:d282:7a28 with SMTP id d9443c01a7336-1f9d2829be3mr19305765ad.41.1718906231479; Thu, 20 Jun 2024 10:57:11 -0700 (PDT) Received: from localhost ([216.228.127.128]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f9d0ec7a7asm15684145ad.251.2024.06.20.10.57.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 10:57:10 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org, "David S. Miller" , "H. Peter Anvin" , "James E.J. Bottomley" , "K. Y. Srinivasan" , "Md. Haris Iqbal" , Akinobu Mita , Andrew Morton , Bjorn Andersson , Borislav Petkov , Chaitanya Kulkarni , Christian Brauner , Damien Le Moal , Dave Hansen , David Disseldorp , Edward Cree , Eric Dumazet , Fenghua Yu , Geert Uytterhoeven , Greg Kroah-Hartman , Gregory Greenman , Hans Verkuil , Hans de Goede , Hugh Dickins , Ingo Molnar , Jakub Kicinski , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Jiri Pirko , Jiri Slaby , Kalle Valo , Karsten Graul , Karsten Keil , Kees Cook , Leon Romanovsky , Mark Rutland , Martin Habets , Mauro Carvalho Chehab , Michael Ellerman , Michal Simek , Nicholas Piggin , Oliver Neukum , Paolo Abeni , Paolo Bonzini , Peter Zijlstra , Ping-Ke Shih , Rich Felker , Rob Herring , Robin Murphy , Sean Christopherson , Shuai Xue , Stanislaw Gruszka , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Valentin Schneider , Vitaly Kuznetsov , Wenjia Zhang , Will Deacon , Yoshinori Sato , GR-QLogic-Storage-Upstream@marvell.com, alsa-devel@alsa-project.org, ath10k@lists.infradead.org, dmaengine@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-block@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-media@vger.kernel.org, linux-mips@vger.kernel.org, linux-net-drivers@amd.com, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-serial@vger.kernel.org, linux-sh@vger.kernel.org, linux-sound@vger.kernel.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, mpi3mr-linuxdrv.pdl@broadcom.com, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Cc: Yury Norov , Alexey Klimov , Bart Van Assche , Jan Kara , Linus Torvalds , Matthew Wilcox , Mirsad Todorovac , Rasmus Villemoes , Sergey Shtylyov Subject: [PATCH v4 01/40] lib/find: add atomic find_bit() primitives Date: Thu, 20 Jun 2024 10:56:24 -0700 Message-ID: <20240620175703.605111-2-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620175703.605111-1-yury.norov@gmail.com> References: <20240620175703.605111-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add helpers around test_and_{set,clear}_bit() to allow searching for clear or set bits and flipping them atomically. Using atomic search primitives allows to implement lockless bitmap handling where only individual bits are touched by concurrent processes, and where people have to protect their bitmaps to search for a free or set bit due to the lack of atomic searching routines. The typical locking routines may look like this: unsigned long alloc_bit() { unsigned long bit; spin_lock(bitmap_lock); bit = find_first_zero_bit(bitmap, nbits); if (bit < nbits) __set_bit(bit, bitmap); spin_unlock(bitmap_lock); return bit; } void free_bit(unsigned long bit) { spin_lock(bitmap_lock); __clear_bit(bit, bitmap); spin_unlock(bitmap_lock); } Now with atomic find_and_set_bit(), the above can be implemented lockless, directly by using it and atomic clear_bit(). Patches 36-40 do this in few places in the kernel where the transition is clear. There is likely more candidates for refactoring. The other important case is when people opencode atomic search or atomic traverse on the maps with the patterns looking like: for (idx = 0; idx < nbits; idx++) if (test_and_clear_bit(idx, bitmap)) do_something(idx); Or like this: do { bit = find_first_bit(bitmap, nbits); if (bit >= nbits) return nbits; } while (!test_and_clear_bit(bit, bitmap)); return bit; In both cases, the opencoded loop may be converted to a single function or iterator call. Correspondingly: for_each_test_and_clear_bit(idx, bitmap, nbits) do_something(idx); Or: return find_and_clear_bit(bitmap, nbits); Obviously, the less routine code people have to write themself, the less probability to make a mistake. The new API is not only a handy helpers - it also resolves a non-trivial issue of using non-atomic find_bit() together with atomic test_and_{set,clear)_bit(). The trick is that find_bit() implies that the bitmap is a regular non-volatile piece of memory, and compiler is allowed to use such optimization techniques like re-fetching memory instead of caching it. For example, find_first_bit() is implemented like: for (idx = 0; idx * BITS_PER_LONG < sz; idx++) { val = addr[idx]; if (val) { sz = min(idx * BITS_PER_LONG + __ffs(val), sz); break; } } On register-memory architectures, like x86, compiler may decide to access memory twice - first time to compare against 0, and second time to fetch its value to pass it to __ffs(). When running find_first_bit() on volatile memory, the memory may get changed in-between, and for instance, it may lead to passing 0 to __ffs(), which is undefined. This is a potentially dangerous call. find_and_clear_bit() as a wrapper around test_and_clear_bit() naturally treats underlying bitmap as a volatile memory and prevents compiler from such optimizations. Now that KCSAN is catching exactly this type of situations and warns on undercover memory modifications. We can use it to reveal improper usage of find_bit(), and convert it to atomic find_and_*_bit() as appropriate. In some cases concurrent operations with plain find_bit() are acceptable. For example: - two threads running find_*_bit(): safe wrt ffs(0) and returns correct value, because underlying bitmap is unchanged; - find_next_bit() in parallel with set or clear_bit(), when modifying a bit prior to the start bit to search: safe and correct; - find_first_bit() in parallel with set_bit(): safe, but may return wrong bit number; - find_first_zero_bit() in parallel with clear_bit(): same as above. In last 2 cases find_bit() may not return a correct bit number, but it may be OK if caller requires any (not exactly the first) set or clear bit, correspondingly. In such cases, KCSAN may be safely silenced with data_race(). But in most cases where KCSAN detects concurrency we should carefully review their code and likely protect critical sections or switch to atomic find_and_bit(), as appropriate. This patch adds the following atomic primitives: find_and_set_bit(addr, nbits); find_and_set_next_bit(addr, nbits, start); ... Here find_and_{set,clear} part refers to the corresponding test_and_{set,clear}_bit function. Suffixes like _wrap or _lock derive their semantics from corresponding find() or test() functions. For brevity, the naming omits the fact that we search for zero bit in find_and_set, and correspondingly search for set bit in find_and_clear functions. The patch also adds iterators with atomic semantics, like for_each_test_and_set_bit(). Here, the naming rule is to simply prefix corresponding atomic operation with 'for_each'. CC: Bart Van Assche CC: Sergey Shtylyov Signed-off-by: Yury Norov --- MAINTAINERS | 1 + include/linux/find.h | 4 - include/linux/find_atomic.h | 324 ++++++++++++++++++++++++++++++++++++ lib/find_bit.c | 86 ++++++++++ 4 files changed, 411 insertions(+), 4 deletions(-) create mode 100644 include/linux/find_atomic.h diff --git a/MAINTAINERS b/MAINTAINERS index b68c8b25bb93..54f37d4f33dd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3730,6 +3730,7 @@ F: include/linux/bitmap-str.h F: include/linux/bitmap.h F: include/linux/bits.h F: include/linux/cpumask.h +F: include/linux/find_atomic.h F: include/linux/find.h F: include/linux/nodemask.h F: include/vdso/bits.h diff --git a/include/linux/find.h b/include/linux/find.h index 5dfca4225fef..a855f82ab9ad 100644 --- a/include/linux/find.h +++ b/include/linux/find.h @@ -2,10 +2,6 @@ #ifndef __LINUX_FIND_H_ #define __LINUX_FIND_H_ -#ifndef __LINUX_BITMAP_H -#error only can be included directly -#endif - #include unsigned long _find_next_bit(const unsigned long *addr1, unsigned long nbits, diff --git a/include/linux/find_atomic.h b/include/linux/find_atomic.h new file mode 100644 index 000000000000..a9e238f88d0b --- /dev/null +++ b/include/linux/find_atomic.h @@ -0,0 +1,324 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LINUX_FIND_ATOMIC_H_ +#define __LINUX_FIND_ATOMIC_H_ + +#include +#include + +unsigned long _find_and_set_bit(volatile unsigned long *addr, unsigned long nbits); +unsigned long _find_and_set_next_bit(volatile unsigned long *addr, unsigned long nbits, + unsigned long start); +unsigned long _find_and_set_bit_lock(volatile unsigned long *addr, unsigned long nbits); +unsigned long _find_and_set_next_bit_lock(volatile unsigned long *addr, unsigned long nbits, + unsigned long start); +unsigned long _find_and_clear_bit(volatile unsigned long *addr, unsigned long nbits); +unsigned long _find_and_clear_next_bit(volatile unsigned long *addr, unsigned long nbits, + unsigned long start); + +/** + * find_and_set_bit - Find a zero bit and set it atomically + * @addr: The address to base the search on + * @nbits: The bitmap size in bits + * + * This function is designed to operate in concurrent access environment. + * + * Because of concurrency and volatile nature of underlying bitmap, it's not + * guaranteed that the found bit is the 1st bit in the bitmap. It's also not + * guaranteed that if >= @nbits is returned, the bitmap is empty. + * + * The function does guarantee that if returned value is in range [0 .. @nbits), + * the acquired bit belongs to the caller exclusively. + * + * Returns: found and set bit, or >= @nbits if no bits found + */ +static inline +unsigned long find_and_set_bit(volatile unsigned long *addr, unsigned long nbits) +{ + if (small_const_nbits(nbits)) { + unsigned long val, ret; + + do { + val = *addr | ~GENMASK(nbits - 1, 0); + if (val == ~0UL) + return nbits; + ret = ffz(val); + } while (test_and_set_bit(ret, addr)); + + return ret; + } + + return _find_and_set_bit(addr, nbits); +} + + +/** + * find_and_set_next_bit - Find a zero bit and set it, starting from @offset + * @addr: The address to base the search on + * @nbits: The bitmap nbits in bits + * @offset: The bitnumber to start searching at + * + * This function is designed to operate in concurrent access environment. + * + * Because of concurrency and volatile nature of underlying bitmap, it's not + * guaranteed that the found bit is the 1st bit in the bitmap, starting from + * @offset. It's also not guaranteed that if >= @nbits is returned, the bitmap + * is empty. + * + * The function does guarantee that if returned value is in range [@offset .. @nbits), + * the acquired bit belongs to the caller exclusively. + * + * Returns: found and set bit, or >= @nbits if no bits found + */ +static inline +unsigned long find_and_set_next_bit(volatile unsigned long *addr, + unsigned long nbits, unsigned long offset) +{ + if (small_const_nbits(nbits)) { + unsigned long val, ret; + + do { + val = *addr | ~GENMASK(nbits - 1, offset); + if (val == ~0UL) + return nbits; + ret = ffz(val); + } while (test_and_set_bit(ret, addr)); + + return ret; + } + + return _find_and_set_next_bit(addr, nbits, offset); +} + +/** + * find_and_set_bit_wrap - find and set bit starting at @offset, wrapping around zero + * @addr: The first address to base the search on + * @nbits: The bitmap size in bits + * @offset: The bitnumber to start searching at + * + * Returns: the bit number for the next clear bit, or first clear bit up to @offset, + * while atomically setting it. If no bits are found, returns >= @nbits. + */ +static inline +unsigned long find_and_set_bit_wrap(volatile unsigned long *addr, + unsigned long nbits, unsigned long offset) +{ + unsigned long bit = find_and_set_next_bit(addr, nbits, offset); + + if (bit < nbits || offset == 0) + return bit; + + bit = find_and_set_bit(addr, offset); + return bit < offset ? bit : nbits; +} + +/** + * find_and_set_bit_lock - find a zero bit, then set it atomically with lock + * @addr: The address to base the search on + * @nbits: The bitmap nbits in bits + * + * This function is designed to operate in concurrent access environment. + * + * Because of concurrency and volatile nature of underlying bitmap, it's not + * guaranteed that the found bit is the 1st bit in the bitmap. It's also not + * guaranteed that if >= @nbits is returned, the bitmap is empty. + * + * The function does guarantee that if returned value is in range [0 .. @nbits), + * the acquired bit belongs to the caller exclusively. + * + * Returns: found and set bit, or >= @nbits if no bits found + */ +static inline +unsigned long find_and_set_bit_lock(volatile unsigned long *addr, unsigned long nbits) +{ + if (small_const_nbits(nbits)) { + unsigned long val, ret; + + do { + val = *addr | ~GENMASK(nbits - 1, 0); + if (val == ~0UL) + return nbits; + ret = ffz(val); + } while (test_and_set_bit_lock(ret, addr)); + + return ret; + } + + return _find_and_set_bit_lock(addr, nbits); +} + +/** + * find_and_set_next_bit_lock - find a zero bit and set it atomically with lock + * @addr: The address to base the search on + * @nbits: The bitmap size in bits + * @offset: The bitnumber to start searching at + * + * This function is designed to operate in concurrent access environment. + * + * Because of concurrency and volatile nature of underlying bitmap, it's not + * guaranteed that the found bit is the 1st bit in the range. It's also not + * guaranteed that if >= @nbits is returned, the bitmap is empty. + * + * The function does guarantee that if returned value is in range [@offset .. @nbits), + * the acquired bit belongs to the caller exclusively. + * + * Returns: found and set bit, or >= @nbits if no bits found + */ +static inline +unsigned long find_and_set_next_bit_lock(volatile unsigned long *addr, + unsigned long nbits, unsigned long offset) +{ + if (small_const_nbits(nbits)) { + unsigned long val, ret; + + do { + val = *addr | ~GENMASK(nbits - 1, offset); + if (val == ~0UL) + return nbits; + ret = ffz(val); + } while (test_and_set_bit_lock(ret, addr)); + + return ret; + } + + return _find_and_set_next_bit_lock(addr, nbits, offset); +} + +/** + * find_and_set_bit_wrap_lock - find zero bit starting at @ofset and set it + * with lock, and wrap around zero if nothing found + * @addr: The first address to base the search on + * @nbits: The bitmap size in bits + * @offset: The bitnumber to start searching at + * + * Returns: the bit number for the next set bit, or first set bit up to @offset + * If no bits are set, returns >= @nbits. + */ +static inline +unsigned long find_and_set_bit_wrap_lock(volatile unsigned long *addr, + unsigned long nbits, unsigned long offset) +{ + unsigned long bit = find_and_set_next_bit_lock(addr, nbits, offset); + + if (bit < nbits || offset == 0) + return bit; + + bit = find_and_set_bit_lock(addr, offset); + return bit < offset ? bit : nbits; +} + +/** + * find_and_clear_bit - Find a set bit and clear it atomically + * @addr: The address to base the search on + * @nbits: The bitmap nbits in bits + * + * This function is designed to operate in concurrent access environment. + * + * Because of concurrency and volatile nature of underlying bitmap, it's not + * guaranteed that the found bit is the 1st bit in the bitmap. It's also not + * guaranteed that if >= @nbits is returned, the bitmap is empty. + * + * The function does guarantee that if returned value is in range [0 .. @nbits), + * the acquired bit belongs to the caller exclusively. + * + * Returns: found and cleared bit, or >= @nbits if no bits found + */ +static inline unsigned long find_and_clear_bit(volatile unsigned long *addr, unsigned long nbits) +{ + if (small_const_nbits(nbits)) { + unsigned long val, ret; + + do { + val = *addr & GENMASK(nbits - 1, 0); + if (val == 0) + return nbits; + ret = __ffs(val); + } while (!test_and_clear_bit(ret, addr)); + + return ret; + } + + return _find_and_clear_bit(addr, nbits); +} + +/** + * find_and_clear_next_bit - Find a set bit next after @offset, and clear it atomically + * @addr: The address to base the search on + * @nbits: The bitmap nbits in bits + * @offset: bit offset at which to start searching + * + * This function is designed to operate in concurrent access environment. + * + * Because of concurrency and volatile nature of underlying bitmap, it's not + * guaranteed that the found bit is the 1st bit in the range It's also not + * guaranteed that if >= @nbits is returned, there's no set bits after @offset. + * + * The function does guarantee that if returned value is in range [@offset .. @nbits), + * the acquired bit belongs to the caller exclusively. + * + * Returns: found and cleared bit, or >= @nbits if no bits found + */ +static inline +unsigned long find_and_clear_next_bit(volatile unsigned long *addr, + unsigned long nbits, unsigned long offset) +{ + if (small_const_nbits(nbits)) { + unsigned long val, ret; + + do { + val = *addr & GENMASK(nbits - 1, offset); + if (val == 0) + return nbits; + ret = __ffs(val); + } while (!test_and_clear_bit(ret, addr)); + + return ret; + } + + return _find_and_clear_next_bit(addr, nbits, offset); +} + +/** + * __find_and_set_bit - Find a zero bit and set it non-atomically + * @addr: The address to base the search on + * @nbits: The bitmap size in bits + * + * A non-atomic version of find_and_set_bit() needed to help writing + * common-looking code where atomicity is provided externally. + * + * Returns: found and set bit, or >= @nbits if no bits found + */ +static inline +unsigned long __find_and_set_bit(unsigned long *addr, unsigned long nbits) +{ + unsigned long bit; + + bit = find_first_zero_bit(addr, nbits); + if (bit < nbits) + __set_bit(bit, addr); + + return bit; +} + +/* same as for_each_set_bit() but atomically clears each found bit */ +#define for_each_test_and_clear_bit(bit, addr, size) \ + for ((bit) = 0; \ + (bit) = find_and_clear_next_bit((addr), (size), (bit)), (bit) < (size); \ + (bit)++) + +/* same as for_each_set_bit_from() but atomically clears each found bit */ +#define for_each_test_and_clear_bit_from(bit, addr, size) \ + for (; (bit) = find_and_clear_next_bit((addr), (size), (bit)), (bit) < (size); (bit)++) + +/* same as for_each_clear_bit() but atomically sets each found bit */ +#define for_each_test_and_set_bit(bit, addr, size) \ + for ((bit) = 0; \ + (bit) = find_and_set_next_bit((addr), (size), (bit)), (bit) < (size); \ + (bit)++) + +/* same as for_each_clear_bit_from() but atomically clears each found bit */ +#define for_each_test_and_set_bit_from(bit, addr, size) \ + for (; \ + (bit) = find_and_set_next_bit((addr), (size), (bit)), (bit) < (size); \ + (bit)++) + +#endif /* __LINUX_FIND_ATOMIC_H_ */ diff --git a/lib/find_bit.c b/lib/find_bit.c index 0836bb3d76c5..a322abd1e540 100644 --- a/lib/find_bit.c +++ b/lib/find_bit.c @@ -14,6 +14,7 @@ #include #include +#include #include #include #include @@ -128,6 +129,91 @@ unsigned long _find_first_and_and_bit(const unsigned long *addr1, } EXPORT_SYMBOL(_find_first_and_and_bit); +unsigned long _find_and_set_bit(volatile unsigned long *addr, unsigned long nbits) +{ + unsigned long bit; + + do { + bit = FIND_FIRST_BIT(~addr[idx], /* nop */, nbits); + if (bit >= nbits) + return nbits; + } while (test_and_set_bit(bit, addr)); + + return bit; +} +EXPORT_SYMBOL(_find_and_set_bit); + +unsigned long _find_and_set_next_bit(volatile unsigned long *addr, + unsigned long nbits, unsigned long start) +{ + unsigned long bit; + + do { + bit = FIND_NEXT_BIT(~addr[idx], /* nop */, nbits, start); + if (bit >= nbits) + return nbits; + } while (test_and_set_bit(bit, addr)); + + return bit; +} +EXPORT_SYMBOL(_find_and_set_next_bit); + +unsigned long _find_and_set_bit_lock(volatile unsigned long *addr, unsigned long nbits) +{ + unsigned long bit; + + do { + bit = FIND_FIRST_BIT(~addr[idx], /* nop */, nbits); + if (bit >= nbits) + return nbits; + } while (test_and_set_bit_lock(bit, addr)); + + return bit; +} +EXPORT_SYMBOL(_find_and_set_bit_lock); + +unsigned long _find_and_set_next_bit_lock(volatile unsigned long *addr, + unsigned long nbits, unsigned long start) +{ + unsigned long bit; + + do { + bit = FIND_NEXT_BIT(~addr[idx], /* nop */, nbits, start); + if (bit >= nbits) + return nbits; + } while (test_and_set_bit_lock(bit, addr)); + + return bit; +} +EXPORT_SYMBOL(_find_and_set_next_bit_lock); + +unsigned long _find_and_clear_bit(volatile unsigned long *addr, unsigned long nbits) +{ + unsigned long bit; + + do { + bit = FIND_FIRST_BIT(addr[idx], /* nop */, nbits); + if (bit >= nbits) + return nbits; + } while (!test_and_clear_bit(bit, addr)); + + return bit; +} +EXPORT_SYMBOL(_find_and_clear_bit); + +unsigned long _find_and_clear_next_bit(volatile unsigned long *addr, + unsigned long nbits, unsigned long start) +{ + do { + start = FIND_NEXT_BIT(addr[idx], /* nop */, nbits, start); + if (start >= nbits) + return nbits; + } while (!test_and_clear_bit(start, addr)); + + return start; +} +EXPORT_SYMBOL(_find_and_clear_next_bit); + #ifndef find_first_zero_bit /* * Find the first cleared bit in a memory region. From patchwork Thu Jun 20 17:56:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13706225 Received: from mail-pg1-f177.google.com (mail-pg1-f177.google.com [209.85.215.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7123B1B4C58; Thu, 20 Jun 2024 17:57:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.177 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906237; cv=none; b=FJ8phEsz78lRnitDHCh+w4eVHrzyGi3vpzRIvhrz06weKgk5cyYWuE3yQs1NitoS998K2+bYUik7yk1BIlPmPrveaCW3l55OwWvH74Mhtwem695h1yCxIFMwseUJKorXNQMvwHYX/XLWx10aR3QdRAtxqxhmG5bX/R5yKL3lLT8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906237; c=relaxed/simple; bh=AaGeTjrw0FfF+0h9/U20FA8dwnbicgFR6M2oz4CBhwo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=saYHHK/gETN5oulQHjzRo+QjFppqP/bhScEzFupoMpZXpjHlXC676vdwyHmVjGxpJtgOjtsy8M5LZuXp3wFO0OIw7BhSZX8I21rTvoTi/kcy32AijbckXhOYSWUctodNyeFkLKGwzb8GtGvvKtuFYwH4KR6+YcKnSlogJlfwvEo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=KKbhWgKz; arc=none smtp.client-ip=209.85.215.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KKbhWgKz" Received: by mail-pg1-f177.google.com with SMTP id 41be03b00d2f7-6e3ff7c4cc8so879911a12.3; Thu, 20 Jun 2024 10:57:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718906235; x=1719511035; darn=vger.kernel.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=93DcC67mVeY/+nPj/RabbHCmpdvAxDoR+WvyjbP4Fv8=; b=KKbhWgKz9TSMkT6GJx+oHzkl14SBbVxhVprFE8KF/u/HwKkgFovEPas7JNigg1VVpd IzxkpMh6nT0UVYcmNhjwq9MIlDRt7g4yYmm1O8iWkPVeTFXREfOb3nd8oxVGrFb4hivT frnx7AjBvakMunPftb+HPJfaJzv7MEmRKL11bKx73fKKPvm19ZVUblrFVREqAa9HlPBz RnyS7gfOlRGCSNyKlrjaT9fU7aG15/2c0Sivad/bbqBvx9C6z5bFVhQxYqskkBgTBcvI dFbp2Vcg+7ym42AldglDeF/T0hQztGy2EkhncU7SuJCrN+Lx13DpCFbN8QA+JJYBhXJr ugWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718906235; x=1719511035; 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=93DcC67mVeY/+nPj/RabbHCmpdvAxDoR+WvyjbP4Fv8=; b=aUGjv/A8mdkdH7XtdU+XpiM18b9wp6RwlvA94ToqCLV3JXdwI8UxzOGZ4/Pe7s7Vrs tYS3qxbCw8BrH3DA2S+Uw7m2acxtI8VWt3UGstQHXMwOeHQ9Y4RvWyhpYVpsyuKWYwx0 7W/mqV+n6PjY85hFK1TnEc2oKbj3TIdgKI8rfdV4gJgO3hS5szd5Dg+Ximz0NMcdAxx8 UAnfIyKkRewgk17aTUR8LpSw7iz1fiL7Mw/WxemlVlJC6J+BrDrp6mL6Jx2KepoJqPVd okjrEEY9AjEj/rZPKkORGxp27RQgRjTeZ5twhRtfOVktktAOcg75oJRtMFKKsQE2q0zh jHXg== X-Forwarded-Encrypted: i=1; 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 X-Gm-Message-State: AOJu0Yx5frqbE7XwDrj7MGKWoBtAdKKoiU8VtdHN2IEA/JB4LxxmDYel YuuoFvMDzov7GE7AMhbcIt4V2nRa0W4yqzZOH4x6UlAyn+vMhtKMV29e1XxwYF0= X-Google-Smtp-Source: AGHT+IF9ITZbJ7vVNEYTX8RCffN7BEtSM9imchEPcbZOZxImDJdvzQARxKbAqm1aXg+Hi0vjNW3ABQ== X-Received: by 2002:a17:902:f687:b0:1f6:fcd9:5b86 with SMTP id d9443c01a7336-1f9aa3ecca8mr64371665ad.12.1718906234591; Thu, 20 Jun 2024 10:57:14 -0700 (PDT) Received: from localhost ([216.228.127.128]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f9d28ce155sm15196715ad.259.2024.06.20.10.57.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 10:57:14 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org, "David S. Miller" , "H. Peter Anvin" , "James E.J. Bottomley" , "K. Y. Srinivasan" , "Md. Haris Iqbal" , Akinobu Mita , Andrew Morton , Bjorn Andersson , Borislav Petkov , Chaitanya Kulkarni , Christian Brauner , Damien Le Moal , Dave Hansen , David Disseldorp , Edward Cree , Eric Dumazet , Fenghua Yu , Geert Uytterhoeven , Greg Kroah-Hartman , Gregory Greenman , Hans Verkuil , Hans de Goede , Hugh Dickins , Ingo Molnar , Jakub Kicinski , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Jiri Pirko , Jiri Slaby , Kalle Valo , Karsten Graul , Karsten Keil , Kees Cook , Leon Romanovsky , Mark Rutland , Martin Habets , Mauro Carvalho Chehab , Michael Ellerman , Michal Simek , Nicholas Piggin , Oliver Neukum , Paolo Abeni , Paolo Bonzini , Peter Zijlstra , Ping-Ke Shih , Rich Felker , Rob Herring , Robin Murphy , Sean Christopherson , Shuai Xue , Stanislaw Gruszka , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Valentin Schneider , Vitaly Kuznetsov , Wenjia Zhang , Will Deacon , Yoshinori Sato , GR-QLogic-Storage-Upstream@marvell.com, alsa-devel@alsa-project.org, ath10k@lists.infradead.org, dmaengine@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-block@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-media@vger.kernel.org, linux-mips@vger.kernel.org, linux-net-drivers@amd.com, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-serial@vger.kernel.org, linux-sh@vger.kernel.org, linux-sound@vger.kernel.org, linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, mpi3mr-linuxdrv.pdl@broadcom.com, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Cc: Yury Norov , Alexey Klimov , Bart Van Assche , Jan Kara , Linus Torvalds , Matthew Wilcox , Mirsad Todorovac , Rasmus Villemoes , Sergey Shtylyov Subject: [PATCH v4 02/40] lib/find: add test for atomic find_bit() ops Date: Thu, 20 Jun 2024 10:56:25 -0700 Message-ID: <20240620175703.605111-3-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620175703.605111-1-yury.norov@gmail.com> References: <20240620175703.605111-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add basic functionality test for new API. Signed-off-by: Yury Norov --- lib/test_bitmap.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c index 65a75d58ed9e..405f79dd2266 100644 --- a/lib/test_bitmap.c +++ b/lib/test_bitmap.c @@ -6,6 +6,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include +#include #include #include #include @@ -221,6 +222,65 @@ static void __init test_zero_clear(void) expect_eq_pbl("", bmap, 1024); } +static void __init test_find_and_bit(void) +{ + unsigned long w, w_part, bit, cnt = 0; + DECLARE_BITMAP(bmap, EXP1_IN_BITS); + + /* + * Test find_and_clear{_next}_bit() and corresponding + * iterators + */ + bitmap_copy(bmap, exp1, EXP1_IN_BITS); + w = bitmap_weight(bmap, EXP1_IN_BITS); + + for_each_test_and_clear_bit(bit, bmap, EXP1_IN_BITS) + cnt++; + + expect_eq_uint(w, cnt); + expect_eq_uint(0, bitmap_weight(bmap, EXP1_IN_BITS)); + + bitmap_copy(bmap, exp1, EXP1_IN_BITS); + w = bitmap_weight(bmap, EXP1_IN_BITS); + w_part = bitmap_weight(bmap, EXP1_IN_BITS / 3); + + cnt = 0; + bit = EXP1_IN_BITS / 3; + for_each_test_and_clear_bit_from(bit, bmap, EXP1_IN_BITS) + cnt++; + + expect_eq_uint(bitmap_weight(bmap, EXP1_IN_BITS), bitmap_weight(bmap, EXP1_IN_BITS / 3)); + expect_eq_uint(w_part, bitmap_weight(bmap, EXP1_IN_BITS)); + expect_eq_uint(w - w_part, cnt); + + /* + * Test find_and_set{_next}_bit() and corresponding + * iterators + */ + bitmap_copy(bmap, exp1, EXP1_IN_BITS); + w = bitmap_weight(bmap, EXP1_IN_BITS); + cnt = 0; + + for_each_test_and_set_bit(bit, bmap, EXP1_IN_BITS) + cnt++; + + expect_eq_uint(EXP1_IN_BITS - w, cnt); + expect_eq_uint(EXP1_IN_BITS, bitmap_weight(bmap, EXP1_IN_BITS)); + + bitmap_copy(bmap, exp1, EXP1_IN_BITS); + w = bitmap_weight(bmap, EXP1_IN_BITS); + w_part = bitmap_weight(bmap, EXP1_IN_BITS / 3); + cnt = 0; + + bit = EXP1_IN_BITS / 3; + for_each_test_and_set_bit_from(bit, bmap, EXP1_IN_BITS) + cnt++; + + expect_eq_uint(EXP1_IN_BITS - bitmap_weight(bmap, EXP1_IN_BITS), + EXP1_IN_BITS / 3 - bitmap_weight(bmap, EXP1_IN_BITS / 3)); + expect_eq_uint(EXP1_IN_BITS * 2 / 3 - (w - w_part), cnt); +} + static void __init test_find_nth_bit(void) { unsigned long b, bit, cnt = 0; @@ -1482,6 +1542,8 @@ static void __init selftest(void) test_for_each_clear_bitrange_from(); test_for_each_set_clump8(); test_for_each_set_bit_wrap(); + + test_find_and_bit(); } KSTM_MODULE_LOADERS(test_bitmap); From patchwork Thu Jun 20 17:56:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13706226 Received: from mail-pf1-f169.google.com (mail-pf1-f169.google.com [209.85.210.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A61481C0044; Thu, 20 Jun 2024 17:57:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906274; cv=none; b=EiUydBIjhUzUSGIdVbrYDMBwtjnq3PZ+2p2i98HjYOo/jpY1SnEuxp5DkQEp+IpbTH1TXjjt1t3NtkGTIJBhY/O9O54ytzHFyiNvNP/ZTXtUvHrokDVFfv2HjC1PNiS8wl2n9KebrZm7wv6rPdyMN5j+xAX1YGHo12J5wF1wxMw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906274; c=relaxed/simple; bh=pqtOnbnky5xRYHpCY2gs4oz50L4qhYf4MNiIl6TOKwo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=P20jkhwBQMFZx0q1PriSOX8N72XyTB2hxi77rwbfK0Uoly1iLGD0ws9dPzV9p/killjtWYKSq1v0wTXpkWd8n49IlYqNvIcGTlad86VILnilWa6vYUtmJjYlak3fIXq3RuJGiDuNsJtg9Q1X4eRKDl0cPW+fSk/J7F0wPtiXPbg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=O1jMxBXj; arc=none smtp.client-ip=209.85.210.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="O1jMxBXj" Received: by mail-pf1-f169.google.com with SMTP id d2e1a72fcca58-705b9a89e08so1073741b3a.1; Thu, 20 Jun 2024 10:57:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718906272; x=1719511072; darn=vger.kernel.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=ns854O7sPQQdjBV1LbOoY/vyRfsFM848PqiWwxxwo8Q=; b=O1jMxBXjVu0N5+tWWL30ewrTny4DzaseEqvxCLu2Nc50n2Bwh6+gy3eoxN8ivLaNSX EvwN/XaOeYwQx8QpNBrsWp4C/WN7GBdwYQ/Vn78UQY/hzYnfmcTkvPymiuWma1zCAAUQ R9l77JzK8pSQEBaeU913tIG2Tr5QI3PC+fuDWdNqC8MnCPUoXHxZ5vJAbof2qq9zRXUQ ryppYDBUNfhNipgNzy9Xw6gqEE9bFAFn86/dmpU0Bg5ilJ71MNlpzAEGQCKv1tpGLQm2 WnknKA/+/9ujGyHxmNlX1msLvoHwJoLxY5Dpew1/01VUhPxLmVmR6AG+a3nYXXXqlB04 +OVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718906272; x=1719511072; 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=ns854O7sPQQdjBV1LbOoY/vyRfsFM848PqiWwxxwo8Q=; b=J3xwNirKAgk4ZMY2/WzU4GKvFpgG/wa38CxBYGzO1am7y1Om7Ds/mAXXj5vL6NjxJE LExG4FVYxs55+CrYJHjpVltsVVEsKCgeleVoEc9F4sN5Q33cN1azHTiIo4lbCpJXcBC/ MQHlVO8rOqTujkf0CQnqltaHd3IlZj6X0nVqnRpohd/D0n8KUivg2O68m6oG4XbmeEnn PzXgsS/uv8m/CrgFMTuHqKJUdpRo/xT5oyVhEAzWNuYdLgIVzYrcH1zHPD6J4eZkPcnA KATkpF7HTQbLqDiGx38x/BzCh4uAPZx40bPEg4jN2p8rK2UY+zdtqWuyIHn6jepH+OuH qFBg== X-Forwarded-Encrypted: i=1; AJvYcCWYojj9pMILWknuQpXZivtGWh0FDEM9jqjT2OA4oy590qZnyRG/PLxfoy1dZr3uuruK9+wWjHa3Eeqoc/m5vF4YQKjgMZ3wA0n3Bw== X-Gm-Message-State: AOJu0Yw+rNepwRzrue/+//2UGT1wvYZLdrgFRVP8XT2iMGyIe9p7ZQjn crOf2IeNLeCnQbfxDUsFBs7pcF+B0XuSnPLgk6JPNAEMTzi2fvvrFVL5WbXkW60= X-Google-Smtp-Source: AGHT+IFQDBD85AA/e7ZhBS6C/4LWgeRZuwweRJrrA1tTXXTcy4Qlg68OlOPMF2Nl1kWKC++a1RbKnw== X-Received: by 2002:a05:6a20:3b93:b0:1b7:d5d5:415b with SMTP id adf61e73a8af0-1bcbb6982femr5756881637.57.1718906272053; Thu, 20 Jun 2024 10:57:52 -0700 (PDT) Received: from localhost ([216.228.127.128]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-705ccb6b4fasm12608970b3a.150.2024.06.20.10.57.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 10:57:51 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org, Sathya Prakash Veerichetty , Kashyap Desai , Sumit Saxena , Sreekanth Reddy , "James E.J. Bottomley" , "Martin K. Petersen" , Nilesh Javali , Manish Rangankar , GR-QLogic-Storage-Upstream@marvell.com, mpi3mr-linuxdrv.pdl@broadcom.com, linux-scsi@vger.kernel.org Cc: Yury Norov , Alexey Klimov , Bart Van Assche , Jan Kara , Linus Torvalds , Matthew Wilcox , Mirsad Todorovac , Rasmus Villemoes , Sergey Shtylyov Subject: [PATCH v4 15/40] scsi: core: optimize scsi_evt_emit() by using an atomic iterator Date: Thu, 20 Jun 2024 10:56:38 -0700 Message-ID: <20240620175703.605111-16-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620175703.605111-1-yury.norov@gmail.com> References: <20240620175703.605111-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 A plain loop in scsi_evt_thread() opencodes optimized atomic bit traversing macro. Simplify it by using the dedicated iterator. CC: Bart Van Assche Signed-off-by: Yury Norov --- drivers/scsi/scsi_lib.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index ec39acc986d6..72bebe5247e7 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -2588,14 +2589,13 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt) void scsi_evt_thread(struct work_struct *work) { struct scsi_device *sdev; - enum scsi_device_event evt_type; + enum scsi_device_event evt_type = SDEV_EVT_FIRST; LIST_HEAD(event_list); sdev = container_of(work, struct scsi_device, event_work); - for (evt_type = SDEV_EVT_FIRST; evt_type <= SDEV_EVT_LAST; evt_type++) - if (test_and_clear_bit(evt_type, sdev->pending_events)) - sdev_evt_send_simple(sdev, evt_type, GFP_KERNEL); + for_each_test_and_clear_bit_from(evt_type, sdev->pending_events, SDEV_EVT_LAST + 1) + sdev_evt_send_simple(sdev, evt_type, GFP_KERNEL); while (1) { struct scsi_event *evt; From patchwork Thu Jun 20 17:56:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13706227 Received: from mail-pj1-f51.google.com (mail-pj1-f51.google.com [209.85.216.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7FC221C004A; Thu, 20 Jun 2024 17:57:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906276; cv=none; b=jqvn+EZjKzajz/ZLH+2m7ARIO3ZLdaTs2C7sA9ArwSWp5IeuDdtDK3kwPybn4NFDVp85SBTavJ/3SoTVSOg1WOH0X7TD3anUaW/UXpkGIP0+64KrGXmQYtffkVtYHvVWdkCvQEYmvnYbPjHdEnYjRXk43UPtYVIxW1fUTBYeQTw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906276; c=relaxed/simple; bh=VYKqh/NkznC9CObWrWdbjElllM8wu6NtGW8jRbGEu1Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qAsgiH9pWatjfArkMPTl0tOhDz62soZ3C0EsPPt8lQxRfvJlnnrXOuzrtggpBwrZ/Wj9nDCF19NG+itouOaLlH7TdRUAj6xAqQyb5cZyy3abHyAtatWOgGaiZxPCdCO/i/dKmNBCKBLjinMe7A9RrE2KKGsfLHS/di+aGbeOpio= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=CN8aEbr7; arc=none smtp.client-ip=209.85.216.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="CN8aEbr7" Received: by mail-pj1-f51.google.com with SMTP id 98e67ed59e1d1-2c2dee9d9cfso1010579a91.3; Thu, 20 Jun 2024 10:57:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718906275; x=1719511075; darn=vger.kernel.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=8gLFCykJTwTUyj41nXgH0cr48eAqtsmwHylJ+z5USpc=; b=CN8aEbr7JOpbChEUsh8Z4WRFqaJBOzmngQqDdE6+TgwkZV9HCs9Ro/p3qd7gkhQ8hT gQlrozxxJ2bmwEWOPXOWRILrsgPtHFMUelHNmz/LaMsg4bqU0utI9Lu31za0F24Cr8U1 3WeLjf5GV2XGJGobsHX+kwH58/VbNbi/G9IDC5hRBWm8cH2QAX0eheQ6kzO60Z/IzhyJ FYlSWpwOiQJ1JVm+OtfzZXjHrDQJW9zhq1Do5jiZRRMGZ4DbKQ+r8wwLsnhGaVBcHRSi iGllA+mmrQHCpQDdFnRbbq8yJDsW+GznQqjmQBBAUnQSA0OPprjvyDGW18F+RkwLW/oV 7qig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718906275; x=1719511075; 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=8gLFCykJTwTUyj41nXgH0cr48eAqtsmwHylJ+z5USpc=; b=cLWvrDm+XvSeq6iOmRxkOjJ/1mQNI6/6ztMkIu45I6QsJdPT8omKxF2y8Wa8M07rJW JLjkwR1mi4MK+6AlNmlJYvlAgOGhg8RS4I0UZPS6/bcQIBPvR1YpbwG1kWlgveeedPGn Md+4TAD0xWP0EQsjfvGgFkLJR10UZUIzxIroQBtGSnqLZV+9z8r9ORxviSR3zqaQTSNY 9eQSl3aTguRIioghagYbs05REk8+aGWri7lqxRLt55gAhpzAlauhv3ociHzpfEZu53my kX2mrJKUczN9YJhNZ/eDMRizOYTnDVBKmEo5u5FkS9CVlqwMYI1KPL94t3Mp0A+Cmc8N B/Vw== X-Forwarded-Encrypted: i=1; AJvYcCVU8T7ol06G7OKunj++sE7KK4jGrSDB2tpoCFF1tWqyp6vO7UtHxVVf7DrgxLoqGQswDC+ZFL2Jm15fhK6NCi2SUMOhIXI1GZgxCw== X-Gm-Message-State: AOJu0YyIAtaEejUvaPt3w0AxFi/sODWXK+gaDmyOjx7oSCfhb/XUb9UC D+x9BQT4zYZXE/xfL/WtSw9In5Mz1ga908TIjjzCFeam+YCpyQioN4vZKLG5nb8= X-Google-Smtp-Source: AGHT+IEs3xkwMF/QaqEF7eP2EEue34uat1uHueDoae/eLjPzmkBpQNQnWmyoCgGGoO7izL2d+Mf08A== X-Received: by 2002:a17:90b:4c43:b0:2c8:647:1600 with SMTP id 98e67ed59e1d1-2c80647165emr1512425a91.9.1718906274840; Thu, 20 Jun 2024 10:57:54 -0700 (PDT) Received: from localhost ([216.228.127.128]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2c7e53ea477sm2023501a91.17.2024.06.20.10.57.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 10:57:54 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org, Sathya Prakash Veerichetty , Kashyap Desai , Sumit Saxena , Sreekanth Reddy , "James E.J. Bottomley" , "Martin K. Petersen" , Nilesh Javali , Manish Rangankar , GR-QLogic-Storage-Upstream@marvell.com, mpi3mr-linuxdrv.pdl@broadcom.com, linux-scsi@vger.kernel.org Cc: Yury Norov , Alexey Klimov , Bart Van Assche , Jan Kara , Linus Torvalds , Matthew Wilcox , Mirsad Todorovac , Rasmus Villemoes , Sergey Shtylyov Subject: [PATCH v4 16/40] scsi: mpi3mr: optimize the driver by using find_and_set_bit() Date: Thu, 20 Jun 2024 10:56:39 -0700 Message-ID: <20240620175703.605111-17-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620175703.605111-1-yury.norov@gmail.com> References: <20240620175703.605111-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 mpi3mr_dev_rmhs_send_tm() and mpi3mr_send_event_ack() opencode find_and_set_bit(). Simplify them by using dedicated function. CC: Bart Van Assche Signed-off-by: Yury Norov --- drivers/scsi/mpi3mr/mpi3mr_os.c | 22 +++++++--------------- 1 file changed, 7 insertions(+), 15 deletions(-) diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c index bce639a6cca1..8ad1521dd0b3 100644 --- a/drivers/scsi/mpi3mr/mpi3mr_os.c +++ b/drivers/scsi/mpi3mr/mpi3mr_os.c @@ -7,6 +7,7 @@ * */ +#include #include "mpi3mr.h" #include @@ -2292,13 +2293,9 @@ static void mpi3mr_dev_rmhs_send_tm(struct mpi3mr_ioc *mrioc, u16 handle, if (drv_cmd) goto issue_cmd; do { - cmd_idx = find_first_zero_bit(mrioc->devrem_bitmap, - MPI3MR_NUM_DEVRMCMD); - if (cmd_idx < MPI3MR_NUM_DEVRMCMD) { - if (!test_and_set_bit(cmd_idx, mrioc->devrem_bitmap)) - break; - cmd_idx = MPI3MR_NUM_DEVRMCMD; - } + cmd_idx = find_and_set_bit(mrioc->devrem_bitmap, MPI3MR_NUM_DEVRMCMD); + if (cmd_idx < MPI3MR_NUM_DEVRMCMD) + break; } while (retrycount--); if (cmd_idx >= MPI3MR_NUM_DEVRMCMD) { @@ -2433,14 +2430,9 @@ static void mpi3mr_send_event_ack(struct mpi3mr_ioc *mrioc, u8 event, "sending event ack in the top half for event(0x%02x), event_ctx(0x%08x)\n", event, event_ctx); do { - cmd_idx = find_first_zero_bit(mrioc->evtack_cmds_bitmap, - MPI3MR_NUM_EVTACKCMD); - if (cmd_idx < MPI3MR_NUM_EVTACKCMD) { - if (!test_and_set_bit(cmd_idx, - mrioc->evtack_cmds_bitmap)) - break; - cmd_idx = MPI3MR_NUM_EVTACKCMD; - } + cmd_idx = find_and_set_bit(mrioc->evtack_cmds_bitmap, MPI3MR_NUM_EVTACKCMD); + if (cmd_idx < MPI3MR_NUM_EVTACKCMD) + break; } while (retrycount--); if (cmd_idx >= MPI3MR_NUM_EVTACKCMD) { From patchwork Thu Jun 20 17:56:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13706228 Received: from mail-pf1-f172.google.com (mail-pf1-f172.google.com [209.85.210.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A24DA1C007E; Thu, 20 Jun 2024 17:57:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906279; cv=none; b=rJXMwiavEGLrNR5XPWLrWxBMEQ4ck5iimJHiSTV9YKFstZeVorwltw+Dg0J6wW58OGP5eZOUJbzHIRNwNNVo8KUboioBCmcO6wwN6IJxjMPA8RofcyG5c1KkrA4Zj8hU4yDFcr3dY6DL49fKa4uy0dcjp8H0s3ScnFJ9HQoKabE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906279; c=relaxed/simple; bh=FZM6CosxQTAEV5PQ+/KRibOjH9YQS1OMFOTTqUFKpt0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=c3oiB6K01w4kVVpykEAqRvOK5xgqAF5+uoM55C06nGXFG41Kt/uSx2Sgn9yKRewHVGQD5danNOdfcGuX480051LhLxoQ7yA9geDJmhc0+jGJair1ehs66WKe1jPV7aX80CY5wYGpf95ZP0k5NdBberd/qNvUyJpGAhzPTiCMBHE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=c7UlnWPU; arc=none smtp.client-ip=209.85.210.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="c7UlnWPU" Received: by mail-pf1-f172.google.com with SMTP id d2e1a72fcca58-7041e39a5beso983263b3a.3; Thu, 20 Jun 2024 10:57:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718906278; x=1719511078; darn=vger.kernel.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=jBNHO7SGyRYGtIlT3hp756CkWMYdfL+ybrdFx5N+b+g=; b=c7UlnWPUUeUtVJwNjx5kaf5cEPYr8gJT/g6NqoxuM2c8u99lOEM7WG946Gmskbsixe ET3g/tjhaRsHUgUTXKZs9j/joP73X4itynY146LlhwPyg0+LSquleQy5t6PaLOxtJWej 1kchOVnLY85P2W2EOiYOD9Uku3EvaDNtES7wQWoS7sSGn70Dl9Omk86BwdgIIe6pOT4T RxY8ywVw0F76TUrExceypvNASojCuWxPH2NYV9qzM3nrMZ810vAHWMrYqv+q1saNAJDG mKHw876SetKlhauXdG1+VfIyCKyNzV4KrqsOTrnGB3aScpVHnkhXjcufYy54ElKDH/DM 9PpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718906278; x=1719511078; 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=jBNHO7SGyRYGtIlT3hp756CkWMYdfL+ybrdFx5N+b+g=; b=i2B7aQ2weAwynSUoCNN7YXTcMU5Ofn+hDZkh+J+zCRZzEY7sRCUq+OhANb/SzXxnOE y+G1TLWqfGaUr+Yfn6sJ+vIC852ENSjJm2tKgBPv7QyGCOmE6xlZ3OyjO450sXCGi6Tp RDZ/SbRgMdwiX1MPJwn5v6drEUwxTfnuaJ7zDQlCBSTzSoCxFU/rO3VIQNVrJTFLxxgY W3jHzR+cKCOvyQ/X5pAYni0BczdN7c/MPVsEgDS5t/4+q8+HpVdZ37fstrl6sP/NbeOj 86gaIespaql+Mz8Y5fv9uh7FE+nfRvQUWBOauDIpbY9HQRVlaKvRx6R1rg7nukHRxxE5 CW1A== X-Forwarded-Encrypted: i=1; AJvYcCXzy5klCf48bSgj1DFSs9kihsjUnUfiPg8JS1P7HapQbvMJH0S5nBUrljyu1osodXcGgb4MN420V9DQfHMEI1IxFu7412E1k/pL5A== X-Gm-Message-State: AOJu0YxnekfiQOsxHeLfImEok8UecXoWHD7Hmguo3XEiK95lVTgEBo2M u8k50saptDA/I6XVAwCQQZMODnKyjNnAYM330giPZDRyy2Gp+G/QvMeCB192gJI= X-Google-Smtp-Source: AGHT+IEkRJptF+yJLHlQoKp30dUDbXDqMnSMJA9iS2RvxoRFsvlFT1i8S85A1astV7Xk0uWHBXz5XA== X-Received: by 2002:a05:6a20:c120:b0:1b6:dffa:d6e4 with SMTP id adf61e73a8af0-1bcbb451678mr5750153637.4.1718906277953; Thu, 20 Jun 2024 10:57:57 -0700 (PDT) Received: from localhost ([216.228.127.128]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-705ccb92c89sm12586864b3a.213.2024.06.20.10.57.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 10:57:57 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org, Sathya Prakash Veerichetty , Kashyap Desai , Sumit Saxena , Sreekanth Reddy , "James E.J. Bottomley" , "Martin K. Petersen" , Nilesh Javali , Manish Rangankar , GR-QLogic-Storage-Upstream@marvell.com, mpi3mr-linuxdrv.pdl@broadcom.com, linux-scsi@vger.kernel.org Cc: Yury Norov , Alexey Klimov , Bart Van Assche , Jan Kara , Linus Torvalds , Matthew Wilcox , Mirsad Todorovac , Rasmus Villemoes , Sergey Shtylyov Subject: [PATCH v4 17/40] scsi: qedi: optimize qedi_get_task_idx() by using find_and_set_bit() Date: Thu, 20 Jun 2024 10:56:40 -0700 Message-ID: <20240620175703.605111-18-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620175703.605111-1-yury.norov@gmail.com> References: <20240620175703.605111-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 qedi_get_task_idx() opencodes find_and_set_bit(). Simplify it and make the whole function a simiple almost one-liner. CC: Bart Van Assche Signed-off-by: Yury Norov --- drivers/scsi/qedi/qedi_main.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c index cd0180b1f5b9..a6e63a6c25fe 100644 --- a/drivers/scsi/qedi/qedi_main.c +++ b/drivers/scsi/qedi/qedi_main.c @@ -5,6 +5,7 @@ */ #include +#include #include #include #include @@ -1824,20 +1825,13 @@ int qedi_get_task_idx(struct qedi_ctx *qedi) { s16 tmp_idx; -again: - tmp_idx = find_first_zero_bit(qedi->task_idx_map, - MAX_ISCSI_TASK_ENTRIES); + tmp_idx = find_and_set_bit(qedi->task_idx_map, MAX_ISCSI_TASK_ENTRIES); if (tmp_idx >= MAX_ISCSI_TASK_ENTRIES) { QEDI_ERR(&qedi->dbg_ctx, "FW task context pool is full.\n"); tmp_idx = -1; - goto err_idx; } - if (test_and_set_bit(tmp_idx, qedi->task_idx_map)) - goto again; - -err_idx: return tmp_idx; } From patchwork Thu Jun 20 17:56:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 13706229 Received: from mail-pg1-f169.google.com (mail-pg1-f169.google.com [209.85.215.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F26D11CFD69; Thu, 20 Jun 2024 17:58:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906332; cv=none; b=PCHk+HB3prAbWetC6+M0qEBEXBEBc5wGh3UalDBabLGluz9hZDl7o3Y3zY1xfvp9sAnUd/7syK73sqj04cJlIp+9IC9IvKIG7dtSSNRu2pNwR69N5Qjji0yD0oa9yIal+wsShLzy81kD9m9TEb4GwdRoFwxzjhDNTuGYVDAvvuA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718906332; c=relaxed/simple; bh=JtxyDAJmwTseDc70rSPwJFLuifJTU6XLGZKMlZ49AeI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lNSZGDggHeuk3mnGyLyMYvlsMcszSW7VpxzLqmzF/lzBpNDLZ9XBThcYytq9JTDMZQystC4+iKSTffT25oEcsMdjs+0emYWh26IpcA7F6L8T8KhVTOt9ALM56Kcwxd8bt9Fli04cucQrOSyiId4RR9YtCIkMknJUxxgmb+qqETM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=PGH7yXlF; arc=none smtp.client-ip=209.85.215.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PGH7yXlF" Received: by mail-pg1-f169.google.com with SMTP id 41be03b00d2f7-707040e3017so848802a12.3; Thu, 20 Jun 2024 10:58:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718906330; x=1719511130; darn=vger.kernel.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=A1P/SC3CnW8VwRQdxuFYJOk3VzBL5R50SJhCR1VLaP4=; b=PGH7yXlFlJDTnty4owPptnNHe+umUxWtkr+BLCQiHnnQ0RRcUFPhQAvHw8VPrlcgbK RvCaW0y+LhjS5W8EDgD8pXrMvWD0vNEVrYHBHFETWMbi1GIwG6r20Kazdaw64g3lS+nE RBLfFngZS1bWDgd2GisjdNvUWVHa8dAiZrIhP3hVSlaV6AZGE7VjMaXTnVeF5o6ftkzS 1ZUQjQCHaoW0hLRoBDBk0oTrel+h+DmPCC2AQh5gJ0XpvDdSt61JeczEeCNjYXRySg+k Jzoa0PwStq+z1IGT4apIA7ufuQqNH/JGLMEezJztD9dg/HTcEV6m8hR2CZ5S81mh7NIq IxAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718906330; x=1719511130; 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=A1P/SC3CnW8VwRQdxuFYJOk3VzBL5R50SJhCR1VLaP4=; b=tGOgqS3eWoa1Wn4I1wXFvz3sEadJ6TiVxTZG6HS4uzl4WmW+NxoHP/kDlWB+z1pUNs sN2qS3Ir3ufG5nqTm0Z+OJZYb021X1FOIkP21l9F9/TK0/8buSeP/xX9WZbC6zqEbB2r zMbtK8p9wfoNlidHDYRXf+eH6vvr1xPc6FCbYIgvCSbHspriiFCGox2lyoIwHT0iw0YZ zP5e/gOgEQsbNByX8MkmiInBWB4S8BGckWq4dI3A4DFpF0mneIreP9szpy6BmEZaK+N8 9YNvfy1/kVVW0fHKSqZSobia5qkzH95ctr1mLEPn0Zdk+Y5CX8uZqZl9k6bI0CYUw4i6 ufcQ== X-Forwarded-Encrypted: i=1; AJvYcCXxTkkWqaXDdMwA3wQqKWfCqpGWbV9+DrLHLPCJiPINKCP5cH1Kful/mTfbNMkHiowTn1zZKwJsvoyq7wc75R01O4f+YISvEAsj7Q== X-Gm-Message-State: AOJu0YzGef4T/z08mzX+lG7ESTFhJc+8rspd6sX/FFQAI9kSh31hmCjR VfcO96sukxM9Pz+E4YKElfjHmodV2s7gTx4KnrxnkY2XKCNkS9lY/3+ZjvFghH0= X-Google-Smtp-Source: AGHT+IGWXsSjB74ZkY33xSGV66MpkL8BGYuPS62vzS9X76Uki4Qr6bCcEMzRCDBxT7/iFMdNX6o18w== X-Received: by 2002:a17:902:dac7:b0:1f7:90e:6d3e with SMTP id d9443c01a7336-1f9aa47878dmr72023545ad.67.1718906330373; Thu, 20 Jun 2024 10:58:50 -0700 (PDT) Received: from localhost ([216.228.127.128]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f9941d957fsm56566125ad.273.2024.06.20.10.58.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Jun 2024 10:58:49 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org, "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Cc: Yury Norov , Alexey Klimov , Bart Van Assche , Jan Kara , Linus Torvalds , Matthew Wilcox , Mirsad Todorovac , Rasmus Villemoes , Sergey Shtylyov Subject: [PATCH v4 36/40] scsi: sr: drop locking around SR index bitmap Date: Thu, 20 Jun 2024 10:56:59 -0700 Message-ID: <20240620175703.605111-37-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240620175703.605111-1-yury.norov@gmail.com> References: <20240620175703.605111-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The driver accesses the sr_index_bits bitmaps to set/clear individual bits only. Now that we have an atomic bit search helper, we can drop the sr_index_lock that protects the sr_index_bits, and make all this routine lockless. While there, use DECLARE_BITMAP() to declare sr_index_bits. Signed-off-by: Yury Norov --- drivers/scsi/sr.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 7ab000942b97..3b4e04ed8b4a 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -33,6 +33,7 @@ * check resource allocation in sr_init and some cleanups */ +#include #include #include #include @@ -103,8 +104,7 @@ static struct scsi_driver sr_template = { .done = sr_done, }; -static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; -static DEFINE_SPINLOCK(sr_index_lock); +static DECLARE_BITMAP(sr_index_bits, SR_DISKS); static struct lock_class_key sr_bio_compl_lkclass; @@ -566,10 +566,7 @@ static void sr_free_disk(struct gendisk *disk) { struct scsi_cd *cd = disk->private_data; - spin_lock(&sr_index_lock); clear_bit(MINOR(disk_devt(disk)), sr_index_bits); - spin_unlock(&sr_index_lock); - unregister_cdrom(&cd->cdi); mutex_destroy(&cd->lock); kfree(cd); @@ -628,15 +625,11 @@ static int sr_probe(struct device *dev) goto fail_free; mutex_init(&cd->lock); - spin_lock(&sr_index_lock); - minor = find_first_zero_bit(sr_index_bits, SR_DISKS); + minor = find_and_set_bit(sr_index_bits, SR_DISKS); if (minor == SR_DISKS) { - spin_unlock(&sr_index_lock); error = -EBUSY; goto fail_put; } - __set_bit(minor, sr_index_bits); - spin_unlock(&sr_index_lock); disk->major = SCSI_CDROM_MAJOR; disk->first_minor = minor; @@ -700,9 +693,7 @@ static int sr_probe(struct device *dev) unregister_cdrom: unregister_cdrom(&cd->cdi); fail_minor: - spin_lock(&sr_index_lock); clear_bit(minor, sr_index_bits); - spin_unlock(&sr_index_lock); fail_put: put_disk(disk); mutex_destroy(&cd->lock);