From patchwork Thu Jul 11 10:44:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Juan Quintela X-Patchwork-Id: 11039603 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C463714DB for ; Thu, 11 Jul 2019 10:44:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B281228A54 for ; Thu, 11 Jul 2019 10:44:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A6CE328A74; Thu, 11 Jul 2019 10:44:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 01E0028A54 for ; Thu, 11 Jul 2019 10:44:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728416AbfGKKou (ORCPT ); Thu, 11 Jul 2019 06:44:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45144 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728414AbfGKKou (ORCPT ); Thu, 11 Jul 2019 06:44:50 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5447B308FFB1; Thu, 11 Jul 2019 10:44:49 +0000 (UTC) Received: from localhost.localdomain (unknown [10.36.118.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5957160600; Thu, 11 Jul 2019 10:44:45 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: "Dr. David Alan Gilbert" , Juan Quintela , Laurent Vivier , kvm@vger.kernel.org, Thomas Huth , Richard Henderson , Paolo Bonzini , Peter Xu Subject: [PULL 11/19] bitmap: Add bitmap_copy_with_{src|dst}_offset() Date: Thu, 11 Jul 2019 12:44:04 +0200 Message-Id: <20190711104412.31233-12-quintela@redhat.com> In-Reply-To: <20190711104412.31233-1-quintela@redhat.com> References: <20190711104412.31233-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Thu, 11 Jul 2019 10:44:49 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Peter Xu These helpers copy the source bitmap to destination bitmap with a shift either on the src or dst bitmap. Meanwhile, we never have bitmap tests but we should. This patch also introduces the initial test cases for utils/bitmap.c but it only tests the newly introduced functions. Signed-off-by: Peter Xu Reviewed-by: Juan Quintela Message-Id: <20190603065056.25211-5-peterx@redhat.com> Signed-off-by: Juan Quintela --- include/qemu/bitmap.h | 9 +++++ tests/Makefile.include | 2 + tests/test-bitmap.c | 72 +++++++++++++++++++++++++++++++++++ util/bitmap.c | 85 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 168 insertions(+) create mode 100644 tests/test-bitmap.c diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 5c313346b9..82a1d2f41f 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -41,6 +41,10 @@ * bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area * bitmap_to_le(dst, src, nbits) Convert bitmap to little endian * bitmap_from_le(dst, src, nbits) Convert bitmap from little endian + * bitmap_copy_with_src_offset(dst, src, offset, nbits) + * *dst = *src (with an offset into src) + * bitmap_copy_with_dst_offset(dst, src, offset, nbits) + * *dst = *src (with an offset into dst) */ /* @@ -271,4 +275,9 @@ void bitmap_to_le(unsigned long *dst, const unsigned long *src, void bitmap_from_le(unsigned long *dst, const unsigned long *src, long nbits); +void bitmap_copy_with_src_offset(unsigned long *dst, const unsigned long *src, + unsigned long offset, unsigned long nbits); +void bitmap_copy_with_dst_offset(unsigned long *dst, const unsigned long *src, + unsigned long shift, unsigned long nbits); + #endif /* BITMAP_H */ diff --git a/tests/Makefile.include b/tests/Makefile.include index a983dd32da..fd7fdb8658 100644 --- a/tests/Makefile.include +++ b/tests/Makefile.include @@ -65,6 +65,7 @@ check-unit-y += tests/test-opts-visitor$(EXESUF) check-unit-$(CONFIG_BLOCK) += tests/test-coroutine$(EXESUF) check-unit-y += tests/test-visitor-serialization$(EXESUF) check-unit-y += tests/test-iov$(EXESUF) +check-unit-y += tests/test-bitmap$(EXESUF) check-unit-$(CONFIG_BLOCK) += tests/test-aio$(EXESUF) check-unit-$(CONFIG_BLOCK) += tests/test-aio-multithread$(EXESUF) check-unit-$(CONFIG_BLOCK) += tests/test-throttle$(EXESUF) @@ -538,6 +539,7 @@ tests/test-image-locking$(EXESUF): tests/test-image-locking.o $(test-block-obj-y tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(test-block-obj-y) tests/test-iov$(EXESUF): tests/test-iov.o $(test-util-obj-y) tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y) $(test-crypto-obj-y) +tests/test-bitmap$(EXESUF): tests/test-bitmap.o $(test-util-obj-y) tests/test-x86-cpuid$(EXESUF): tests/test-x86-cpuid.o tests/test-xbzrle$(EXESUF): tests/test-xbzrle.o migration/xbzrle.o migration/page_cache.o $(test-util-obj-y) tests/test-cutils$(EXESUF): tests/test-cutils.o util/cutils.o $(test-util-obj-y) diff --git a/tests/test-bitmap.c b/tests/test-bitmap.c new file mode 100644 index 0000000000..43f7ba26c5 --- /dev/null +++ b/tests/test-bitmap.c @@ -0,0 +1,72 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * + * Bitmap.c unit-tests. + * + * Copyright (C) 2019, Red Hat, Inc. + * + * Author: Peter Xu + */ + +#include +#include "qemu/osdep.h" +#include "qemu/bitmap.h" + +#define BMAP_SIZE 1024 + +static void check_bitmap_copy_with_offset(void) +{ + unsigned long *bmap1, *bmap2, *bmap3, total; + + bmap1 = bitmap_new(BMAP_SIZE); + bmap2 = bitmap_new(BMAP_SIZE); + bmap3 = bitmap_new(BMAP_SIZE); + + bmap1[0] = random(); + bmap1[1] = random(); + bmap1[2] = random(); + bmap1[3] = random(); + total = BITS_PER_LONG * 4; + + /* Shift 115 bits into bmap2 */ + bitmap_copy_with_dst_offset(bmap2, bmap1, 115, total); + /* Shift another 85 bits into bmap3 */ + bitmap_copy_with_dst_offset(bmap3, bmap2, 85, total + 115); + /* Shift back 200 bits back */ + bitmap_copy_with_src_offset(bmap2, bmap3, 200, total); + + g_assert_cmpmem(bmap1, total / sizeof(unsigned long), + bmap2, total / sizeof(unsigned long)); + + bitmap_clear(bmap1, 0, BMAP_SIZE); + /* Set bits in bmap1 are 100-245 */ + bitmap_set(bmap1, 100, 145); + + /* Set bits in bmap2 are 60-205 */ + bitmap_copy_with_src_offset(bmap2, bmap1, 40, 250); + g_assert_cmpint(find_first_bit(bmap2, 60), ==, 60); + g_assert_cmpint(find_next_zero_bit(bmap2, 205, 60), ==, 205); + g_assert(test_bit(205, bmap2) == 0); + + /* Set bits in bmap3 are 135-280 */ + bitmap_copy_with_dst_offset(bmap3, bmap1, 35, 250); + g_assert_cmpint(find_first_bit(bmap3, 135), ==, 135); + g_assert_cmpint(find_next_zero_bit(bmap3, 280, 135), ==, 280); + g_assert(test_bit(280, bmap3) == 0); + + g_free(bmap1); + g_free(bmap2); + g_free(bmap3); +} + +int main(int argc, char **argv) +{ + g_test_init(&argc, &argv, NULL); + + g_test_add_func("/bitmap/bitmap_copy_with_offset", + check_bitmap_copy_with_offset); + + g_test_run(); + + return 0; +} diff --git a/util/bitmap.c b/util/bitmap.c index cb618c65a5..1753ff7f5b 100644 --- a/util/bitmap.c +++ b/util/bitmap.c @@ -402,3 +402,88 @@ void bitmap_to_le(unsigned long *dst, const unsigned long *src, { bitmap_to_from_le(dst, src, nbits); } + +/* + * Copy "src" bitmap with a positive offset and put it into the "dst" + * bitmap. The caller needs to make sure the bitmap size of "src" + * is bigger than (shift + nbits). + */ +void bitmap_copy_with_src_offset(unsigned long *dst, const unsigned long *src, + unsigned long shift, unsigned long nbits) +{ + unsigned long left_mask, right_mask, last_mask; + + /* Proper shift src pointer to the first word to copy from */ + src += BIT_WORD(shift); + shift %= BITS_PER_LONG; + + if (!shift) { + /* Fast path */ + bitmap_copy(dst, src, nbits); + return; + } + + right_mask = (1ul << shift) - 1; + left_mask = ~right_mask; + + while (nbits >= BITS_PER_LONG) { + *dst = (*src & left_mask) >> shift; + *dst |= (src[1] & right_mask) << (BITS_PER_LONG - shift); + dst++; + src++; + nbits -= BITS_PER_LONG; + } + + if (nbits > BITS_PER_LONG - shift) { + *dst = (*src & left_mask) >> shift; + nbits -= BITS_PER_LONG - shift; + last_mask = (1ul << nbits) - 1; + *dst |= (src[1] & last_mask) << (BITS_PER_LONG - shift); + } else if (nbits) { + last_mask = (1ul << nbits) - 1; + *dst = (*src >> shift) & last_mask; + } +} + +/* + * Copy "src" bitmap into the "dst" bitmap with an offset in the + * "dst". The caller needs to make sure the bitmap size of "dst" is + * bigger than (shift + nbits). + */ +void bitmap_copy_with_dst_offset(unsigned long *dst, const unsigned long *src, + unsigned long shift, unsigned long nbits) +{ + unsigned long left_mask, right_mask, last_mask; + + /* Proper shift dst pointer to the first word to copy from */ + dst += BIT_WORD(shift); + shift %= BITS_PER_LONG; + + if (!shift) { + /* Fast path */ + bitmap_copy(dst, src, nbits); + return; + } + + right_mask = (1ul << (BITS_PER_LONG - shift)) - 1; + left_mask = ~right_mask; + + *dst &= (1ul << shift) - 1; + while (nbits >= BITS_PER_LONG) { + *dst |= (*src & right_mask) << shift; + dst[1] = (*src & left_mask) >> (BITS_PER_LONG - shift); + dst++; + src++; + nbits -= BITS_PER_LONG; + } + + if (nbits > BITS_PER_LONG - shift) { + *dst |= (*src & right_mask) << shift; + nbits -= BITS_PER_LONG - shift; + last_mask = ((1ul << nbits) - 1) << (BITS_PER_LONG - shift); + dst[1] = (*src & last_mask) >> (BITS_PER_LONG - shift); + } else if (nbits) { + last_mask = (1ul << nbits) - 1; + *dst |= (*src & last_mask) << shift; + } +}