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[209.132.180.67]) by mx.google.com with ESMTP id z25si3016428pgv.523.2019.03.01.06.05.31; Fri, 01 Mar 2019 06:05:47 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388321AbfCAOED (ORCPT + 99 others); Fri, 1 Mar 2019 09:04:03 -0500 Received: from foss.arm.com ([217.140.101.70]:35464 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728149AbfCAOED (ORCPT ); Fri, 1 Mar 2019 09:04:03 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 91DF4A78; Fri, 1 Mar 2019 06:04:01 -0800 (PST) Received: from fuggles.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 54CD83F720; Fri, 1 Mar 2019 06:03:58 -0800 (PST) From: Will Deacon To: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Will Deacon , "Paul E. McKenney" , Benjamin Herrenschmidt , Michael Ellerman , Arnd Bergmann , Peter Zijlstra , Andrea Parri , Palmer Dabbelt , Daniel Lustig , David Howells , Alan Stern , Linus Torvalds , "Maciej W. Rozycki" , Paul Burton , Ingo Molnar , Yoshinori Sato , Rich Felker , Tony Luck Subject: [PATCH 00/20] Remove Mysterious Macro Intended to Obscure Weird Behaviours (mmiowb()) Date: Fri, 1 Mar 2019 14:03:28 +0000 Message-Id: <20190301140348.25175-1-will.deacon@arm.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi everybody, This is a non-RFC posting of the RFC previously posted here: https://lwn.net/ml/linux-kernel/20190222185026.10973-1-will.deacon@arm.com/ There have been some significant changes since then, including: * Reduced mmiowb_spin_{lock,unlock}() overhead * Support for the arch code to provide the mmiowb_state storage * Moved PowerPC over to the generic algorithm * Now compiles on x86 and some obscure ia64 configurations * A bunch of minor tweaks As before, this is based on a couple of other I/O-related series that I have pending: https://lkml.org/lkml/2019/2/22/484 // Queued by paulmck, pending review https://lkml.org/lkml/2019/2/22/500 // Queued in arm64 so I've pushed the whole lot out on a branch for your comfort and convenience: git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git io Feedback welcome, Will Cc: "Paul E. McKenney" Cc: Benjamin Herrenschmidt Cc: Michael Ellerman Cc: Arnd Bergmann Cc: Peter Zijlstra Cc: Andrea Parri Cc: Palmer Dabbelt Cc: Daniel Lustig Cc: David Howells Cc: Alan Stern Cc: Linus Torvalds Cc: "Maciej W. Rozycki" Cc: Paul Burton Cc: Ingo Molnar Cc: Yoshinori Sato Cc: Rich Felker Cc: Tony Luck --->8 Will Deacon (20): asm-generic/mmiowb: Add generic implementation of mmiowb() tracking arch: Use asm-generic header for asm/mmiowb.h mmiowb: Hook up mmiowb helpers to spinlocks and generic I/O accessors ARM/io: Remove useless definition of mmiowb() arm64/io: Remove useless definition of mmiowb() x86/io: Remove useless definition of mmiowb() nds32/io: Remove useless definition of mmiowb() m68k/io: Remove useless definition of mmiowb() sh/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() ia64/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() powerpc/mmiowb: Hook up mmwiob() implementation to asm-generic code riscv/mmiowb: Hook up mmwiob() implementation to asm-generic code Documentation: Kill all references to mmiowb() drivers: Remove useless trailing comments from mmiowb() invocations drivers: Remove explicit invocations of mmiowb() scsi/qla1280: Remove stale comment about mmiowb() i40iw: Redefine i40iw_mmiowb() to do nothing net/ethernet/silan/sc92031: Remove stale comment about mmiowb() arch: Remove dummy mmiowb() definitions from arch code Documentation/driver-api/device-io.rst | 45 --------- Documentation/driver-api/pci/p2pdma.rst | 4 - Documentation/memory-barriers.txt | 103 +-------------------- arch/alpha/include/asm/Kbuild | 1 + arch/alpha/include/asm/io.h | 2 - arch/arc/include/asm/Kbuild | 1 + arch/arm/include/asm/Kbuild | 1 + arch/arm/include/asm/io.h | 2 - arch/arm64/include/asm/Kbuild | 1 + arch/arm64/include/asm/io.h | 2 - arch/c6x/include/asm/Kbuild | 1 + arch/csky/include/asm/Kbuild | 1 + arch/h8300/include/asm/Kbuild | 1 + arch/hexagon/include/asm/Kbuild | 1 + arch/hexagon/include/asm/io.h | 2 - arch/ia64/include/asm/io.h | 17 ---- arch/ia64/include/asm/mmiowb.h | 25 +++++ arch/ia64/include/asm/spinlock.h | 2 + arch/m68k/include/asm/Kbuild | 1 + arch/m68k/include/asm/io_mm.h | 2 - arch/microblaze/include/asm/Kbuild | 1 + arch/mips/include/asm/io.h | 3 - arch/mips/include/asm/mmiowb.h | 11 +++ arch/mips/include/asm/spinlock.h | 15 +++ arch/nds32/include/asm/Kbuild | 1 + arch/nds32/include/asm/io.h | 2 - arch/nios2/include/asm/Kbuild | 1 + arch/openrisc/include/asm/Kbuild | 1 + arch/parisc/include/asm/Kbuild | 1 + arch/parisc/include/asm/io.h | 2 - arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/io.h | 33 +------ arch/powerpc/include/asm/mmiowb.h | 18 ++++ arch/powerpc/include/asm/paca.h | 6 +- arch/powerpc/include/asm/spinlock.h | 17 ---- arch/powerpc/xmon/xmon.c | 5 +- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/io.h | 15 +-- arch/riscv/include/asm/mmiowb.h | 14 +++ arch/s390/include/asm/Kbuild | 1 + arch/sh/include/asm/io.h | 3 - arch/sh/include/asm/mmiowb.h | 12 +++ arch/sh/include/asm/spinlock-llsc.h | 2 + arch/sparc/include/asm/Kbuild | 1 + arch/sparc/include/asm/io_64.h | 2 - arch/um/include/asm/Kbuild | 1 + arch/unicore32/include/asm/Kbuild | 1 + arch/x86/include/asm/Kbuild | 1 + arch/x86/include/asm/io.h | 2 - arch/xtensa/include/asm/Kbuild | 1 + drivers/crypto/cavium/nitrox/nitrox_reqmgr.c | 4 - drivers/dma/txx9dmac.c | 3 - drivers/firewire/ohci.c | 1 - drivers/gpu/drm/i915/intel_hdmi.c | 10 -- drivers/ide/tx4939ide.c | 2 - drivers/infiniband/hw/hfi1/chip.c | 3 - drivers/infiniband/hw/hfi1/pio.c | 1 - drivers/infiniband/hw/hns/hns_roce_hw_v1.c | 2 - drivers/infiniband/hw/i40iw/i40iw_osdep.h | 2 +- drivers/infiniband/hw/mlx4/qp.c | 6 -- drivers/infiniband/hw/mlx5/qp.c | 1 - drivers/infiniband/hw/mthca/mthca_cmd.c | 6 -- drivers/infiniband/hw/mthca/mthca_cq.c | 5 - drivers/infiniband/hw/mthca/mthca_qp.c | 17 ---- drivers/infiniband/hw/mthca/mthca_srq.c | 6 -- drivers/infiniband/hw/qedr/verbs.c | 12 --- drivers/infiniband/hw/qib/qib_iba6120.c | 4 - drivers/infiniband/hw/qib/qib_iba7220.c | 3 - drivers/infiniband/hw/qib/qib_iba7322.c | 3 - drivers/infiniband/hw/qib/qib_sd7220.c | 4 - drivers/media/pci/dt3155/dt3155.c | 8 -- drivers/memstick/host/jmb38x_ms.c | 4 - drivers/misc/ioc4.c | 2 - drivers/misc/mei/hw-me.c | 3 - drivers/misc/tifm_7xx1.c | 1 - drivers/mmc/host/alcor.c | 1 - drivers/mmc/host/sdhci.c | 13 --- drivers/mmc/host/tifm_sd.c | 3 - drivers/mmc/host/via-sdmmc.c | 10 -- drivers/mtd/nand/raw/r852.c | 2 - drivers/mtd/nand/raw/txx9ndfmc.c | 1 - drivers/net/ethernet/aeroflex/greth.c | 1 - drivers/net/ethernet/alacritech/slicoss.c | 4 - drivers/net/ethernet/amazon/ena/ena_com.c | 1 - drivers/net/ethernet/atheros/atlx/atl1.c | 1 - drivers/net/ethernet/atheros/atlx/atl2.c | 1 - drivers/net/ethernet/broadcom/bnx2.c | 4 - drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 2 - drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h | 4 - .../net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c | 1 - drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 29 ------ drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c | 1 - drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c | 2 - drivers/net/ethernet/broadcom/bnx2x/bnx2x_vfpf.c | 4 - drivers/net/ethernet/broadcom/bnxt/bnxt.c | 3 - drivers/net/ethernet/broadcom/tg3.c | 6 -- .../net/ethernet/cavium/liquidio/cn66xx_device.c | 10 -- .../net/ethernet/cavium/liquidio/octeon_device.c | 1 - drivers/net/ethernet/cavium/liquidio/octeon_droq.c | 4 - .../net/ethernet/cavium/liquidio/request_manager.c | 1 - drivers/net/ethernet/intel/e1000/e1000_main.c | 5 - drivers/net/ethernet/intel/e1000e/netdev.c | 7 -- drivers/net/ethernet/intel/fm10k/fm10k_iov.c | 2 - drivers/net/ethernet/intel/fm10k/fm10k_main.c | 5 - drivers/net/ethernet/intel/i40e/i40e_txrx.c | 5 - drivers/net/ethernet/intel/iavf/iavf_txrx.c | 5 - drivers/net/ethernet/intel/ice/ice_txrx.c | 5 - drivers/net/ethernet/intel/igb/igb_main.c | 5 - drivers/net/ethernet/intel/igbvf/netdev.c | 4 - drivers/net/ethernet/intel/igc/igc_main.c | 5 - drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 5 - drivers/net/ethernet/marvell/sky2.c | 4 - drivers/net/ethernet/mellanox/mlx4/catas.c | 4 - drivers/net/ethernet/mellanox/mlx4/cmd.c | 13 --- drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 1 - drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 2 - drivers/net/ethernet/neterion/s2io.c | 2 - drivers/net/ethernet/neterion/vxge/vxge-main.c | 5 - drivers/net/ethernet/neterion/vxge/vxge-traffic.c | 4 - drivers/net/ethernet/qlogic/qed/qed_int.c | 13 --- drivers/net/ethernet/qlogic/qed/qed_spq.c | 3 - drivers/net/ethernet/qlogic/qede/qede_ethtool.c | 8 -- drivers/net/ethernet/qlogic/qede/qede_fp.c | 8 -- drivers/net/ethernet/qlogic/qla3xxx.c | 1 - drivers/net/ethernet/qlogic/qlge/qlge.h | 1 - drivers/net/ethernet/qlogic/qlge/qlge_main.c | 1 - drivers/net/ethernet/realtek/r8169.c | 5 - drivers/net/ethernet/renesas/ravb_main.c | 9 -- drivers/net/ethernet/renesas/ravb_ptp.c | 3 - drivers/net/ethernet/renesas/sh_eth.c | 1 - drivers/net/ethernet/sfc/falcon/io.h | 2 - drivers/net/ethernet/sfc/io.h | 2 - drivers/net/ethernet/silan/sc92031.c | 15 --- drivers/net/ethernet/via/via-rhine.c | 3 - drivers/net/ethernet/wiznet/w5100.c | 6 -- drivers/net/ethernet/wiznet/w5300.c | 15 --- drivers/net/wireless/ath/ath5k/base.c | 4 - drivers/net/wireless/ath/ath5k/mac80211-ops.c | 2 - drivers/net/wireless/broadcom/b43/main.c | 7 -- drivers/net/wireless/broadcom/b43/sysfs.c | 1 - drivers/net/wireless/broadcom/b43legacy/ilt.c | 2 - drivers/net/wireless/broadcom/b43legacy/main.c | 20 ---- drivers/net/wireless/broadcom/b43legacy/phy.c | 1 - drivers/net/wireless/broadcom/b43legacy/pio.h | 1 - drivers/net/wireless/broadcom/b43legacy/radio.c | 4 - drivers/net/wireless/broadcom/b43legacy/sysfs.c | 1 - drivers/net/wireless/intel/iwlegacy/common.h | 7 -- drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 1 - drivers/ntb/hw/idt/ntb_hw_idt.c | 7 -- drivers/ntb/test/ntb_perf.c | 3 - drivers/scsi/bfa/bfa.h | 3 +- drivers/scsi/bfa/bfa_hw_cb.c | 2 - drivers/scsi/bfa/bfa_hw_ct.c | 2 - drivers/scsi/bnx2fc/bnx2fc_hwi.c | 2 - drivers/scsi/bnx2i/bnx2i_hwi.c | 3 - drivers/scsi/megaraid/megaraid_sas_base.c | 1 - drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 - drivers/scsi/mpt3sas/mpt3sas_base.c | 1 - drivers/scsi/qedf/qedf_io.c | 1 - drivers/scsi/qedi/qedi_fw.c | 1 - drivers/scsi/qla1280.c | 15 --- drivers/ssb/pci.c | 1 - drivers/ssb/pcmcia.c | 4 - drivers/staging/comedi/drivers/mite.c | 3 - drivers/staging/comedi/drivers/ni_660x.c | 2 - drivers/staging/comedi/drivers/ni_mio_common.c | 1 - drivers/staging/comedi/drivers/ni_pcidio.c | 2 - drivers/staging/comedi/drivers/ni_tio.c | 1 - drivers/staging/comedi/drivers/s626.c | 2 - drivers/tty/serial/men_z135_uart.c | 1 - drivers/tty/serial/serial_txx9.c | 1 - drivers/usb/early/xhci-dbc.c | 4 - drivers/usb/host/xhci-dbgcap.c | 2 - include/asm-generic/io.h | 7 +- include/asm-generic/mmiowb.h | 63 +++++++++++++ include/asm-generic/mmiowb_types.h | 12 +++ include/linux/qed/qed_if.h | 2 - include/linux/spinlock.h | 11 ++- kernel/Kconfig.locks | 7 ++ kernel/locking/spinlock.c | 7 ++ kernel/locking/spinlock_debug.c | 6 +- sound/soc/txx9/txx9aclc-ac97.c | 1 - 182 files changed, 247 insertions(+), 783 deletions(-) create mode 100644 arch/ia64/include/asm/mmiowb.h create mode 100644 arch/mips/include/asm/mmiowb.h create mode 100644 arch/powerpc/include/asm/mmiowb.h create mode 100644 arch/riscv/include/asm/mmiowb.h create mode 100644 arch/sh/include/asm/mmiowb.h create mode 100644 include/asm-generic/mmiowb.h create mode 100644 include/asm-generic/mmiowb_types.h -- 2.11.0