From patchwork Mon Feb 17 11:45:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Roger Pau Monne X-Patchwork-Id: 11386177 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 79D3017E8 for ; Mon, 17 Feb 2020 11:47:16 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 46CA0206F4 for ; Mon, 17 Feb 2020 11:47:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="Q8Esq4a+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 46CA0206F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j3eqo-0001BP-4j; Mon, 17 Feb 2020 11:46:10 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j3eqn-0001AS-1K for xen-devel@lists.xenproject.org; Mon, 17 Feb 2020 11:46:09 +0000 X-Inumbo-ID: 1481823e-517b-11ea-bc8e-bc764e2007e4 Received: from esa2.hc3370-68.iphmx.com (unknown [216.71.145.153]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 1481823e-517b-11ea-bc8e-bc764e2007e4; Mon, 17 Feb 2020 11:46:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1581939966; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=wrtHJNuL2tWxmyfOTFTjmWQj6+PEQKZYa+vWfEmz+zY=; b=Q8Esq4a+USU2AwHQZv39JCV94eb0kgQ8Dm/29WMw1zj7rjhNJdxcz9va Rt+kASwsqZuP0CsXNU3VnI7yA39b2w13GVzh7TefYNZkLHrD1bvahrw00 Xrdwsxyuf14oYgEtFa+ftqPp+AWzhTBkZTGbhijyRzu8GOzkiIwhEplIg A=; Authentication-Results: esa2.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none; spf=None smtp.pra=roger.pau@citrix.com; spf=Pass smtp.mailfrom=roger.pau@citrix.com; spf=None smtp.helo=postmaster@mail.citrix.com Received-SPF: None (esa2.hc3370-68.iphmx.com: no sender authenticity information available from domain of roger.pau@citrix.com) identity=pra; client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible Received-SPF: Pass (esa2.hc3370-68.iphmx.com: domain of roger.pau@citrix.com designates 162.221.158.21 as permitted sender) identity=mailfrom; client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="roger.pau@citrix.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:209.167.231.154 ip4:178.63.86.133 ip4:195.66.111.40/30 ip4:85.115.9.32/28 ip4:199.102.83.4 ip4:192.28.146.160 ip4:192.28.146.107 ip4:216.52.6.88 ip4:216.52.6.188 ip4:162.221.158.21 ip4:162.221.156.83 ip4:168.245.78.127 ~all" Received-SPF: None (esa2.hc3370-68.iphmx.com: no sender authenticity information available from domain of postmaster@mail.citrix.com) identity=helo; client-ip=162.221.158.21; receiver=esa2.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: xHkWEcu/tgHRGhT2KaY4EljeOiGCyG87cNHsXR1DJlHF53aqQIwMebLaew1j3dBGOrY2LXqEJw BF1GX8uqLjCnuH2pZBMRXkyfqKGJtQEudzdw0NjzsIlEHY21oVlh1mJFodYlaQLU4BNRfJTHMS cA1V8MWKJGrzwYM2OAhvJ0VAFRtRIdPIKBIEamkhDodi+OrjCFVupwHsO5+Sz/UcDoo960uLbm OKu0pb9l/fcEynzEKmWVpBCKlP8yx6slHjhfbRgL8b/F7D1X99EYDZVAukLcR96cQZ6+B493S7 D4I= X-SBRS: 2.7 X-MesageID: 12565373 X-Ironport-Server: esa2.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.70,452,1574139600"; d="scan'208";a="12565373" From: Roger Pau Monne To: Date: Mon, 17 Feb 2020 12:45:44 +0100 Message-ID: <20200217114545.71112-4-roger.pau@citrix.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200217114545.71112-1-roger.pau@citrix.com> References: <20200217114545.71112-1-roger.pau@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v5 3/4] bitmap: import bitmap_{set/clear} from Linux 5.5 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Jan Beulich , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Import the functions and it's dependencies. Based on Linux 5.5, commit id d5226fa6dbae0569ee43ecfc08bdcd6770fc4755. Signed-off-by: Roger Pau Monné Acked-by: Jan Beulich --- Changes since v4: - Introduce BIT_WORD in generic header bitops.h (instead of the x86 one). - Include byteorder.h for __LITTLE_ENDIAN - Remove EXPORT_SYMBOL. --- xen/common/bitmap.c | 39 +++++++++++++++++++++++++++++++++++++++ xen/include/xen/bitmap.h | 40 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/xen/common/bitmap.c b/xen/common/bitmap.c index fd070bee97..88768bf8bc 100644 --- a/xen/common/bitmap.c +++ b/xen/common/bitmap.c @@ -212,6 +212,45 @@ int __bitmap_weight(const unsigned long *bitmap, int bits) #endif EXPORT_SYMBOL(__bitmap_weight); +void __bitmap_set(unsigned long *map, unsigned int start, int len) +{ + unsigned long *p = map + BIT_WORD(start); + const unsigned int size = start + len; + int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG); + unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start); + + while (len - bits_to_set >= 0) { + *p |= mask_to_set; + len -= bits_to_set; + bits_to_set = BITS_PER_LONG; + mask_to_set = ~0UL; + p++; + } + if (len) { + mask_to_set &= BITMAP_LAST_WORD_MASK(size); + *p |= mask_to_set; + } +} + +void __bitmap_clear(unsigned long *map, unsigned int start, int len) +{ + unsigned long *p = map + BIT_WORD(start); + const unsigned int size = start + len; + int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG); + unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start); + + while (len - bits_to_clear >= 0) { + *p &= ~mask_to_clear; + len -= bits_to_clear; + bits_to_clear = BITS_PER_LONG; + mask_to_clear = ~0UL; + p++; + } + if (len) { + mask_to_clear &= BITMAP_LAST_WORD_MASK(size); + *p &= ~mask_to_clear; + } +} /** * bitmap_find_free_region - find a contiguous aligned mem region diff --git a/xen/include/xen/bitmap.h b/xen/include/xen/bitmap.h index 4e1e690af1..c44e009f8c 100644 --- a/xen/include/xen/bitmap.h +++ b/xen/include/xen/bitmap.h @@ -85,6 +85,8 @@ extern int __bitmap_intersects(const unsigned long *bitmap1, extern int __bitmap_subset(const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern int __bitmap_weight(const unsigned long *bitmap, int bits); +extern void __bitmap_set(unsigned long *map, unsigned int start, int len); +extern void __bitmap_clear(unsigned long *map, unsigned int start, int len); extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order); extern void bitmap_release_region(unsigned long *bitmap, int pos, int order); @@ -227,6 +229,44 @@ static inline int bitmap_weight(const unsigned long *src, int nbits) return __bitmap_weight(src, nbits); } +#include + +#ifdef __LITTLE_ENDIAN +#define BITMAP_MEM_ALIGNMENT 8 +#else +#define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long)) +#endif +#define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1) +#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) + +static inline void bitmap_set(unsigned long *map, unsigned int start, + unsigned int nbits) +{ + if (__builtin_constant_p(nbits) && nbits == 1) + __set_bit(start, map); + else if (__builtin_constant_p(start & BITMAP_MEM_MASK) && + IS_ALIGNED(start, BITMAP_MEM_ALIGNMENT) && + __builtin_constant_p(nbits & BITMAP_MEM_MASK) && + IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) + memset((char *)map + start / 8, 0xff, nbits / 8); + else + __bitmap_set(map, start, nbits); +} + +static inline void bitmap_clear(unsigned long *map, unsigned int start, + unsigned int nbits) +{ + if (__builtin_constant_p(nbits) && nbits == 1) + __clear_bit(start, map); + else if (__builtin_constant_p(start & BITMAP_MEM_MASK) && + IS_ALIGNED(start, BITMAP_MEM_ALIGNMENT) && + __builtin_constant_p(nbits & BITMAP_MEM_MASK) && + IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) + memset((char *)map + start / 8, 0, nbits / 8); + else + __bitmap_clear(map, start, nbits); +} + #undef bitmap_switch #undef bitmap_bytes