From patchwork Tue Nov 12 15:59:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 11239719 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 573C315AB for ; Tue, 12 Nov 2019 16:00:07 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A0D1B21925 for ; Tue, 12 Nov 2019 16:00:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="J0E3t8yA" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A0D1B21925 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OA1STqVokIYhX40ty5j3DuVULPYtTpoMwntSwiHNsV0=; b=J0E3t8yA2AofXm 5cI4PKepfD63mUSQr26zugYQLJYH/kfXv/pUL/XXxkc7ElH6Jp75yx0oyhLuaDFqox7gKPl7UOlDQ C7lar7rdbUp+6M0S+9NRwvR9N4dRJ+3TYeR/3ql9GgaZQbOV0Z3e/sXEDJlM2jM7Sag+LOCT8wFOt n3tHfk2ApMui7AALaM3XkO9HbjyE8CghXHdUZpJ8fpKaYNdzX+p9OHOkbi8iunyjIVlL/c05MnJMc Ihry1Zb6htzSxsNK1T2rOlC2xtz9iI17EDCITH5JM/8LNy6UIvzY5e9pAXqma6Bhk8Y4VFwu8qmuN uLGb4dmougxKH4FDa6Gg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iUYaF-0005vf-E1; Tue, 12 Nov 2019 15:59:59 +0000 Received: from mx2.suse.de ([195.135.220.15] helo=mx1.suse.de) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iUYZx-0005We-Oz; Tue, 12 Nov 2019 15:59:43 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 32F7DB3C9; Tue, 12 Nov 2019 15:59:40 +0000 (UTC) From: Nicolas Saenz Julienne To: andrew.murray@arm.com, maz@kernel.org, linux-kernel@vger.kernel.org, Tariq Toukan , Tom Joseph , Lorenzo Pieralisi , Shawn Lin , Heiko Stuebner , Christoph Hellwig , Marek Szyprowski , Robin Murphy Subject: [PATCH v2 1/6] linux/log2.h: Add roundup/rounddown_pow_two64() family of functions Date: Tue, 12 Nov 2019 16:59:20 +0100 Message-Id: <20191112155926.16476-2-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191112155926.16476-1-nsaenzjulienne@suse.de> References: <20191112155926.16476-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191112_075942_101404_7369BA82 X-CRM114-Status: GOOD ( 15.51 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [195.135.220.15 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, f.fainelli@gmail.com, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, phil@raspberrypi.org, jeremy.linton@arm.com, linux-rockchip@lists.infradead.org, iommu@lists.linux-foundation.org, mbrugger@suse.com, wahrenst@gmx.net, james.quinlan@broadcom.com, linux-pci@vger.kernel.org, Bjorn Helgaas , "David S. Miller" , Nicolas Saenz Julienne Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Some users need to make sure their rounding function accepts and returns 64bit long variables regardless of the architecture. Sadly roundup/rounddown_pow_two() takes and returns unsigned longs. Create a new generic 64bit variant of the function and cleanup rougue custom implementations. Signed-off-by: Nicolas Saenz Julienne --- drivers/net/ethernet/mellanox/mlx4/en_clock.c | 3 +- drivers/pci/controller/pcie-cadence-ep.c | 7 +-- drivers/pci/controller/pcie-cadence.c | 7 +-- drivers/pci/controller/pcie-rockchip-ep.c | 9 ++-- include/linux/log2.h | 52 +++++++++++++++++++ kernel/dma/direct.c | 3 +- 6 files changed, 63 insertions(+), 18 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c index 024788549c25..027bd72505e2 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c @@ -33,6 +33,7 @@ #include #include +#include #include "mlx4_en.h" @@ -252,7 +253,7 @@ static u32 freq_to_shift(u16 freq) { u32 freq_khz = freq * 1000; u64 max_val_cycles = freq_khz * 1000 * MLX4_EN_WRAP_AROUND_SEC; - u64 max_val_cycles_rounded = 1ULL << fls64(max_val_cycles - 1); + u64 max_val_cycles_rounded = roundup_pow_of_two64(max_val_cycles); /* calculate max possible multiplier in order to fit in 64bit */ u64 max_mul = div64_u64(ULLONG_MAX, max_val_cycles_rounded); diff --git a/drivers/pci/controller/pcie-cadence-ep.c b/drivers/pci/controller/pcie-cadence-ep.c index def7820cb824..26ff424b16f5 100644 --- a/drivers/pci/controller/pcie-cadence-ep.c +++ b/drivers/pci/controller/pcie-cadence-ep.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "pcie-cadence.h" @@ -90,11 +91,7 @@ static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn, /* BAR size is 2^(aperture + 7) */ sz = max_t(size_t, epf_bar->size, CDNS_PCIE_EP_MIN_APERTURE); - /* - * roundup_pow_of_two() returns an unsigned long, which is not suited - * for 64bit values. - */ - sz = 1ULL << fls64(sz - 1); + sz = roundup_pow_of_two64(sz); aperture = ilog2(sz) - 7; /* 128B -> 0, 256B -> 1, 512B -> 2, ... */ if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { diff --git a/drivers/pci/controller/pcie-cadence.c b/drivers/pci/controller/pcie-cadence.c index cd795f6fc1e2..b2278e6b955c 100644 --- a/drivers/pci/controller/pcie-cadence.c +++ b/drivers/pci/controller/pcie-cadence.c @@ -4,6 +4,7 @@ // Author: Cyrille Pitchen #include +#include #include "pcie-cadence.h" @@ -11,11 +12,7 @@ void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u8 fn, u32 r, bool is_io, u64 cpu_addr, u64 pci_addr, size_t size) { - /* - * roundup_pow_of_two() returns an unsigned long, which is not suited - * for 64bit values. - */ - u64 sz = 1ULL << fls64(size - 1); + u64 sz = roundup_pow_of_two64(size); int nbits = ilog2(sz); u32 addr0, addr1, desc0, desc1; diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c index d743b0a48988..ed50aaf27784 100644 --- a/drivers/pci/controller/pcie-rockchip-ep.c +++ b/drivers/pci/controller/pcie-rockchip-ep.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "pcie-rockchip.h" @@ -70,7 +71,7 @@ static void rockchip_pcie_prog_ep_ob_atu(struct rockchip_pcie *rockchip, u8 fn, u32 r, u32 type, u64 cpu_addr, u64 pci_addr, size_t size) { - u64 sz = 1ULL << fls64(size - 1); + u64 sz = roundup_pow_of_two64(size); int num_pass_bits = ilog2(sz); u32 addr0, addr1, desc0, desc1; bool is_nor_msg = (type == AXI_WRAPPER_NOR_MSG); @@ -172,11 +173,7 @@ static int rockchip_pcie_ep_set_bar(struct pci_epc *epc, u8 fn, /* BAR size is 2^(aperture + 7) */ sz = max_t(size_t, epf_bar->size, MIN_EP_APERTURE); - /* - * roundup_pow_of_two() returns an unsigned long, which is not suited - * for 64bit values. - */ - sz = 1ULL << fls64(sz - 1); + sz = roundup_pow_of_two64(sz); aperture = ilog2(sz) - 7; /* 128B -> 0, 256B -> 1, 512B -> 2, ... */ if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) { diff --git a/include/linux/log2.h b/include/linux/log2.h index 83a4a3ca3e8a..db12d92ab6eb 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -67,6 +67,24 @@ unsigned long __rounddown_pow_of_two(unsigned long n) return 1UL << (fls_long(n) - 1); } +/** + * __roundup_pow_of_two64() - round 64bit value up to nearest power of two + * @n: value to round up + */ +static inline __attribute__((const)) __u64 __roundup_pow_of_two64(__u64 n) +{ + return 1UL << fls64(n - 1); +} + +/** + * __rounddown_pow_of_two64() - round 64bit value down to nearest power of two + * @n: value to round down + */ +static inline __attribute__((const)) __u64 __rounddown_pow_of_two64(__u64 n) +{ + return 1UL << (fls64(n) - 1); +} + /** * const_ilog2 - log base 2 of 32-bit or a 64-bit constant unsigned value * @n: parameter @@ -194,6 +212,40 @@ unsigned long __rounddown_pow_of_two(unsigned long n) __rounddown_pow_of_two(n) \ ) +/** + * roundup_pow_of_two64 - round the given 64bit value up to nearest power of + * two + * @n: parameter + * + * round the given value up to the nearest power of two + * - the result is undefined when n == 0 + * - this can be used to initialise global variables from constant data + */ +#define roundup_pow_of_two64(n) \ +( \ + __builtin_constant_p(n) ? ( \ + (n == 1) ? 1 : \ + (1UL << (ilog2((n) - 1) + 1)) \ + ) : \ + __roundup_pow_of_two64(n) \ +) + +/** + * rounddown_pow_of_two64 - round the given 64bit value down to nearest power + * of two + * @n: parameter + * + * round the given value down to the nearest power of two + * - the result is undefined when n == 0 + * - this can be used to initialise global variables from constant data + */ +#define rounddown_pow_of_two64(n) \ +( \ + __builtin_constant_p(n) ? ( \ + (1UL << ilog2(n))) : \ + __rounddown_pow_of_two64(n) \ +) + static inline __attribute_const__ int __order_base_2(unsigned long n) { diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index b9e1744999d9..a419530abd3e 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -15,6 +15,7 @@ #include #include #include +#include /* * Most architectures use ZONE_DMA for the first 16 Megabytes, but some use it @@ -53,7 +54,7 @@ u64 dma_direct_get_required_mask(struct device *dev) { u64 max_dma = phys_to_dma_direct(dev, (max_pfn - 1) << PAGE_SHIFT); - return (1ULL << (fls64(max_dma) - 1)) * 2 - 1; + return rounddown_pow_of_two64(max_dma) * 2 - 1; } static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,