From patchwork Mon Feb 19 17:48:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 10228275 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C8AE3602B7 for ; Mon, 19 Feb 2018 16:59:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B715128ADA for ; Mon, 19 Feb 2018 16:59:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AB2D628AFF; Mon, 19 Feb 2018 16:59:12 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 B395728ADA for ; Mon, 19 Feb 2018 16:59:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753182AbeBSQ6W (ORCPT ); Mon, 19 Feb 2018 11:58:22 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:45759 "EHLO huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753302AbeBSQ5G (ORCPT ); Mon, 19 Feb 2018 11:57:06 -0500 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 16043E3756D14; Tue, 20 Feb 2018 00:56:48 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.361.1; Tue, 20 Feb 2018 00:56:40 +0800 From: John Garry To: , , , , , , , , , , , , CC: , , , , , , , , , Subject: [PATCH v14 1/9] LIB: Introduce a generic PIO mapping method Date: Tue, 20 Feb 2018 01:48:32 +0800 Message-ID: <1519062520-198902-2-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1519062520-198902-1-git-send-email-john.garry@huawei.com> References: <1519062520-198902-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Zhichang Yuan In commit 41f8bba7f555 ("of/pci: Add pci_register_io_range() and pci_pio_to_address()"), a new I/O space management was supported. With that driver, the I/O ranges configured for PCI/PCIe hosts on some architectures can be mapped to logical PIO, converted easily between CPU address and the corresponding logicial PIO. Based on this, PCI I/O devices can be accessed in a memory read/write way through the unified in/out accessors. But on some archs/platforms, there are bus hosts which access I/O peripherals with host-local I/O port addresses rather than memory addresses after memory-mapped. To support those devices, a more generic I/O mapping method is introduced here. Through this patch, both the CPU addresses and the host-local port can be mapped into the logical PIO space with different logical/fake PIOs. After this, all the I/O accesses to either PCI MMIO devices or host-local I/O peripherals can be unified into the existing I/O accessors defined in asm-generic/io.h and be redirected to the right device-specific hooks based on the input logical PIO. Signed-off-by: Zhichang Yuan Signed-off-by: Gabriele Paoloni Signed-off-by: John Garry --- include/asm-generic/io.h | 2 + include/linux/logic_pio.h | 131 +++++++++++++++++++++ lib/Kconfig | 15 +++ lib/Makefile | 2 + lib/logic_pio.c | 285 ++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 435 insertions(+) create mode 100644 include/linux/logic_pio.h create mode 100644 lib/logic_pio.c diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index b4531e3..b7996a79 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -351,6 +351,8 @@ static inline void writesq(volatile void __iomem *addr, const void *buffer, #define IO_SPACE_LIMIT 0xffff #endif +#include + /* * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be * implemented on hardware that needs an additional delay for I/O accesses to diff --git a/include/linux/logic_pio.h b/include/linux/logic_pio.h new file mode 100644 index 0000000..5c56b9e --- /dev/null +++ b/include/linux/logic_pio.h @@ -0,0 +1,131 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved. + * Author: Gabriele Paoloni + * Author: Zhichang Yuan + * + */ + +#ifndef __LINUX_LOGIC_PIO_H +#define __LINUX_LOGIC_PIO_H + +#ifdef __KERNEL__ + +#include + +#define PIO_INDIRECT 0x01UL /* indirect IO flag */ +#define PIO_CPU_MMIO 0x00UL /* memory mapped io flag */ + +struct logic_pio_hwaddr { + struct list_head list; + struct fwnode_handle *fwnode; + resource_size_t hw_start; + resource_size_t io_start; + resource_size_t size; /* range size populated */ + unsigned long flags; + + void *hostdata; + const struct logic_pio_host_ops *ops; +}; + +struct logic_pio_host_ops { + u32 (*in)(void *hostdata, unsigned long addr, size_t dwidth); + void (*out)(void *hostdata, unsigned long addr, u32 val, + size_t dwidth); + u32 (*ins)(void *hostdata, unsigned long addr, void *buffer, + size_t dwidth, unsigned int count); + void (*outs)(void *hostdata, unsigned long addr, const void *buffer, + size_t dwidth, unsigned int count); +}; + +#ifdef CONFIG_INDIRECT_PIO +u8 logic_inb(unsigned long addr); +void logic_outb(u8 value, unsigned long addr); +void logic_outw(u16 value, unsigned long addr); +void logic_outl(u32 value, unsigned long addr); +u16 logic_inw(unsigned long addr); +u32 logic_inl(unsigned long addr); +void logic_outb(u8 value, unsigned long addr); +void logic_outw(u16 value, unsigned long addr); +void logic_outl(u32 value, unsigned long addr); +void logic_insb(unsigned long addr, void *buffer, unsigned int count); +void logic_insl(unsigned long addr, void *buffer, unsigned int count); +void logic_insw(unsigned long addr, void *buffer, unsigned int count); +void logic_outsb(unsigned long addr, const void *buffer, unsigned int count); +void logic_outsw(unsigned long addr, const void *buffer, unsigned int count); +void logic_outsl(unsigned long addr, const void *buffer, unsigned int count); + +#ifndef inb +#define inb logic_inb +#endif + +#ifndef inw +#define inw logic_inw +#endif + +#ifndef inl +#define inl logic_inl +#endif + +#ifndef outb +#define outb logic_outb +#endif + +#ifndef outw +#define outw logic_outw +#endif + +#ifndef outl +#define outl logic_outl +#endif + +#ifndef insb +#define insb logic_insb +#endif + +#ifndef insw +#define insw logic_insw +#endif + +#ifndef insl +#define insl logic_insl +#endif + +#ifndef outsb +#define outsb logic_outsb +#endif + +#ifndef outsw +#define outsw logic_outsw +#endif + +#ifndef outsl +#define outsl logic_outsl +#endif + +/* + * Below we reserve 0x4000 bytes for Indirect IO as so far this library is only + * used by Hisilicon LPC Host. If needed in future we may reserve a wider IO + * area by redefining the macro below. + */ +#define PIO_INDIRECT_SIZE 0x4000 +#define MMIO_UPPER_LIMIT (IO_SPACE_LIMIT - PIO_INDIRECT_SIZE) +#else +#define MMIO_UPPER_LIMIT IO_SPACE_LIMIT +#endif /* CONFIG_INDIRECT_PIO */ + + +struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode); + +unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode, + resource_size_t hw_addr, resource_size_t size); + +int logic_pio_register_range(struct logic_pio_hwaddr *newrange); + + +extern resource_size_t logic_pio_to_hwaddr(unsigned long pio); + +extern unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr); + +#endif /* __KERNEL__ */ +#endif /* __LINUX_LOGIC_PIO_H */ diff --git a/lib/Kconfig b/lib/Kconfig index e960894..d9dd02c 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -55,6 +55,21 @@ config ARCH_USE_CMPXCHG_LOCKREF config ARCH_HAS_FAST_MULTIPLIER bool +config INDIRECT_PIO + bool "Access I/O in non-MMIO mode" + depends on ARM64 + help + On some platforms where no separate I/O space exists, there are I/O + hosts which can not be accessed in MMIO mode. Using the logical PIO + mechanism, the host-local I/O resource can be mapped into system + logic PIO space shared with MMIO hosts, such as PCI/PCIE, then the + system can access the I/O devices with the mapped logic PIO through + I/O accessors. + This way has relatively little I/O performance cost. Please make + sure your devices really need this configure item enabled. + + When in doubt, say N. + config CRC_CCITT tristate "CRC-CCITT functions" help diff --git a/lib/Makefile b/lib/Makefile index a90d4fc..4a9eacd 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -81,6 +81,8 @@ obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o +obj-y += logic_pio.o + obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o obj-$(CONFIG_BTREE) += btree.o diff --git a/lib/logic_pio.c b/lib/logic_pio.c new file mode 100644 index 0000000..bacc0b3 --- /dev/null +++ b/lib/logic_pio.c @@ -0,0 +1,285 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved. + * Author: Gabriele Paoloni + * Author: Zhichang Yuan + * + */ + +#define pr_fmt(fmt) "LOGIC PIO: " fmt + +#include +#include +#include +#include +#include +#include +#include + +/* The unique hardware address list. */ +static LIST_HEAD(io_range_list); +static DEFINE_MUTEX(io_range_mutex); + +/** + * logic_pio_register_range - register logical PIO range for a host + * @new_range: pointer to the io range to be registered. + * + * returns 0 on success, the error code in case of failure + * + * Register a new io range node in the io range list. + */ +int logic_pio_register_range(struct logic_pio_hwaddr *new_range) +{ + struct logic_pio_hwaddr *range; + resource_size_t start = new_range->hw_start; + resource_size_t end = new_range->hw_start + new_range->size; + resource_size_t allocated_mmio_size = 0; + resource_size_t allocated_iio_size = MMIO_UPPER_LIMIT; + int ret = 0; + + if (!new_range || !new_range->fwnode || !new_range->size) + return -EINVAL; + + mutex_lock(&io_range_mutex); + list_for_each_entry_rcu(range, &io_range_list, list) { + if (range->fwnode == new_range->fwnode) { + /* range already there */ + ret = -EFAULT; + goto end_register; + } + if (range->flags == PIO_CPU_MMIO && + new_range->flags == PIO_CPU_MMIO) { + /* for MMIO ranges we need to check for overlap */ + if (start >= range->hw_start + range->size || + end < range->hw_start) + allocated_mmio_size += range->size; + else { + ret = -EFAULT; + goto end_register; + } + } else if (range->flags == PIO_INDIRECT && + new_range->flags == PIO_INDIRECT) { + allocated_iio_size += range->size; + } + } + + /* range not registered yet, check for available space */ + if (new_range->flags == PIO_CPU_MMIO) { + if (allocated_mmio_size + new_range->size - 1 > + MMIO_UPPER_LIMIT) { + /* if it's too big check if 64K space can be reserved */ + if (allocated_mmio_size + SZ_64K - 1 > + MMIO_UPPER_LIMIT) { + ret = -E2BIG; + goto end_register; + } + new_range->size = SZ_64K; + pr_warn("Requested IO range too big, new size set to 64K\n"); + } + new_range->io_start = allocated_mmio_size; + } else if (new_range->flags == PIO_INDIRECT) { + if (allocated_iio_size + new_range->size - 1 > + IO_SPACE_LIMIT) { + ret = -E2BIG; + goto end_register; + } + new_range->io_start = allocated_iio_size; + } else { + /* invalid flag */ + ret = -EINVAL; + goto end_register; + } + + list_add_tail_rcu(&new_range->list, &io_range_list); + +end_register: + mutex_unlock(&io_range_mutex); + return ret; +} + +/** + * find_io_range_by_fwnode - find logical PIO range for given FW node + * @fwnode: FW node handle associated with logical PIO range + * + * Returns pointer to node on success, NULL otherwise + * + * Traverse the io_range_list to find the registered node whose device node + * and/or physical IO address match to. + */ +struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode) +{ + struct logic_pio_hwaddr *range; + + list_for_each_entry_rcu(range, &io_range_list, list) { + if (range->fwnode == fwnode) + return range; + } + return NULL; +} + +/* Return a registered range given an input PIO token */ +static struct logic_pio_hwaddr *find_io_range(unsigned long pio) +{ + struct logic_pio_hwaddr *range; + + list_for_each_entry_rcu(range, &io_range_list, list) { + if (pio >= range->io_start && + pio < range->io_start + range->size) + return range; + } + pr_err("PIO entry token invalid\n"); + return NULL; +} + +/** + * logic_pio_to_hwaddr - translate logical PIO to HW address + * @pio: logical PIO value + * + * Returns HW address if valid, -1 otherwise + * + * Translate the input logical pio to the corresponding hardware address. + * The input pio should be unique in the whole logical PIO space. + */ +resource_size_t logic_pio_to_hwaddr(unsigned long pio) +{ + struct logic_pio_hwaddr *range; + resource_size_t hwaddr = -1; + + range = find_io_range(pio); + if (range) + hwaddr = range->hw_start + pio - range->io_start; + + return hwaddr; +} + +/** + * logic_pio_trans_hwaddr - translate HW address to logical PIO + * @fwnode: FW node reference for the host + * @addr: Host-relative HW address + * @size: size to translate + * + * Returns Logical PIO value if successful, -1 otherwise + */ +unsigned long +logic_pio_trans_hwaddr(struct fwnode_handle *fwnode, resource_size_t addr, + resource_size_t size) +{ + struct logic_pio_hwaddr *range; + + range = find_io_range_by_fwnode(fwnode); + if (!range || range->flags == PIO_CPU_MMIO) { + pr_err("range not found or invalid\n"); + return -1; + } + if (range->size < size) { + pr_err("resource size %pa cannot fit in IO range size %pa\n", + &size, &range->size); + return -1; + } + return addr - range->hw_start + range->io_start; +} + +unsigned long +logic_pio_trans_cpuaddr(resource_size_t addr) +{ + struct logic_pio_hwaddr *range; + + list_for_each_entry_rcu(range, &io_range_list, list) { + if (range->flags != PIO_CPU_MMIO) + continue; + if (addr >= range->hw_start && + addr < range->hw_start + range->size) + return addr - range->hw_start + + range->io_start; + } + pr_err("addr not registered in io_range_list\n"); + return -1; +} + +#if defined(CONFIG_INDIRECT_PIO) && defined(PCI_IOBASE) +#define BUILD_LOGIC_IO(bw, type) \ +type logic_in##bw(unsigned long addr) \ +{ \ + type ret = -1; \ + \ + if (addr < MMIO_UPPER_LIMIT) { \ + ret = read##bw(PCI_IOBASE + addr); \ + } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \ + struct logic_pio_hwaddr *entry = find_io_range(addr); \ + \ + if (entry && entry->ops) \ + ret = entry->ops->in(entry->hostdata, \ + addr, sizeof(type)); \ + else \ + WARN_ON_ONCE(1); \ + } \ + return ret; \ +} \ + \ +void logic_out##bw(type value, unsigned long addr) \ +{ \ + if (addr < MMIO_UPPER_LIMIT) { \ + write##bw(value, PCI_IOBASE + addr); \ + } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \ + struct logic_pio_hwaddr *entry = find_io_range(addr); \ + \ + if (entry && entry->ops) \ + entry->ops->out(entry->hostdata, \ + addr, value, sizeof(type)); \ + else \ + WARN_ON_ONCE(1); \ + } \ +} \ + \ +void logic_ins##bw(unsigned long addr, void *buffer, \ + unsigned int count) \ +{ \ + if (addr < MMIO_UPPER_LIMIT) { \ + reads##bw(PCI_IOBASE + addr, buffer, count); \ + } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \ + struct logic_pio_hwaddr *entry = find_io_range(addr); \ + \ + if (entry && entry->ops) \ + entry->ops->ins(entry->hostdata, \ + addr, buffer, sizeof(type), count); \ + else \ + WARN_ON_ONCE(1); \ + } \ + \ +} \ + \ +void logic_outs##bw(unsigned long addr, const void *buffer, \ + unsigned int count) \ +{ \ + if (addr < MMIO_UPPER_LIMIT) { \ + writes##bw(PCI_IOBASE + addr, buffer, count); \ + } else if (addr >= MMIO_UPPER_LIMIT && addr < IO_SPACE_LIMIT) { \ + struct logic_pio_hwaddr *entry = find_io_range(addr); \ + \ + if (entry && entry->ops) \ + entry->ops->outs(entry->hostdata, \ + addr, buffer, sizeof(type), count); \ + else \ + WARN_ON_ONCE(1); \ + } \ +} + +BUILD_LOGIC_IO(b, u8) +EXPORT_SYMBOL(logic_inb); +EXPORT_SYMBOL(logic_insb); +EXPORT_SYMBOL(logic_outb); +EXPORT_SYMBOL(logic_outsb); + +BUILD_LOGIC_IO(w, u16) +EXPORT_SYMBOL(logic_inw); +EXPORT_SYMBOL(logic_insw); +EXPORT_SYMBOL(logic_outw); +EXPORT_SYMBOL(logic_outsw); + +BUILD_LOGIC_IO(l, u32) +EXPORT_SYMBOL(logic_inl); +EXPORT_SYMBOL(logic_insl); +EXPORT_SYMBOL(logic_outl); +EXPORT_SYMBOL(logic_outsl); + +#endif /* CONFIG_INDIRECT_PIO && PCI_IOBASE */