430 lines
11 KiB
C
430 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Implement the default iomap interfaces
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*
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* (C) Copyright 2004 Linus Torvalds
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*/
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <linux/kmsan-checks.h>
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#include <linux/export.h>
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/*
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* Read/write from/to an (offsettable) iomem cookie. It might be a PIO
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* access or a MMIO access, these functions don't care. The info is
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* encoded in the hardware mapping set up by the mapping functions
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* (or the cookie itself, depending on implementation and hw).
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*
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* The generic routines don't assume any hardware mappings, and just
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* encode the PIO/MMIO as part of the cookie. They coldly assume that
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* the MMIO IO mappings are not in the low address range.
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*
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* Architectures for which this is not true can't use this generic
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* implementation and should do their own copy.
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*/
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#ifndef HAVE_ARCH_PIO_SIZE
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/*
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* We encode the physical PIO addresses (0-0xffff) into the
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* pointer by offsetting them with a constant (0x10000) and
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* assuming that all the low addresses are always PIO. That means
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* we can do some sanity checks on the low bits, and don't
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* need to just take things for granted.
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*/
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#define PIO_OFFSET 0x10000UL
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#define PIO_MASK 0x0ffffUL
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#define PIO_RESERVED 0x40000UL
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#endif
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static void bad_io_access(unsigned long port, const char *access)
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{
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static int count = 10;
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if (count) {
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count--;
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WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access);
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}
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}
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/*
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* Ugly macros are a way of life.
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*/
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#define IO_COND(addr, is_pio, is_mmio) do { \
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unsigned long port = (unsigned long __force)addr; \
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if (port >= PIO_RESERVED) { \
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is_mmio; \
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} else if (port > PIO_OFFSET) { \
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port &= PIO_MASK; \
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is_pio; \
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} else \
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bad_io_access(port, #is_pio ); \
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} while (0)
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#ifndef pio_read16be
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#define pio_read16be(port) swab16(inw(port))
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#define pio_read32be(port) swab32(inl(port))
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#endif
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#ifndef mmio_read16be
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#define mmio_read16be(addr) swab16(readw(addr))
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#define mmio_read32be(addr) swab32(readl(addr))
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#define mmio_read64be(addr) swab64(readq(addr))
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#endif
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/*
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* Here and below, we apply __no_kmsan_checks to functions reading data from
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* hardware, to ensure that KMSAN marks their return values as initialized.
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*/
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__no_kmsan_checks
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unsigned int ioread8(const void __iomem *addr)
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{
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IO_COND(addr, return inb(port), return readb(addr));
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return 0xff;
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}
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__no_kmsan_checks
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unsigned int ioread16(const void __iomem *addr)
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{
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IO_COND(addr, return inw(port), return readw(addr));
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return 0xffff;
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}
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__no_kmsan_checks
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unsigned int ioread16be(const void __iomem *addr)
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{
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IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
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return 0xffff;
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}
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__no_kmsan_checks
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unsigned int ioread32(const void __iomem *addr)
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{
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IO_COND(addr, return inl(port), return readl(addr));
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return 0xffffffff;
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}
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__no_kmsan_checks
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unsigned int ioread32be(const void __iomem *addr)
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{
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IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
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return 0xffffffff;
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}
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EXPORT_SYMBOL(ioread8);
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EXPORT_SYMBOL(ioread16);
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EXPORT_SYMBOL(ioread16be);
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EXPORT_SYMBOL(ioread32);
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EXPORT_SYMBOL(ioread32be);
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#ifdef readq
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static u64 pio_read64_lo_hi(unsigned long port)
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{
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u64 lo, hi;
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lo = inl(port);
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hi = inl(port + sizeof(u32));
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return lo | (hi << 32);
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}
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static u64 pio_read64_hi_lo(unsigned long port)
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{
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u64 lo, hi;
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hi = inl(port + sizeof(u32));
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lo = inl(port);
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return lo | (hi << 32);
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}
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static u64 pio_read64be_lo_hi(unsigned long port)
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{
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u64 lo, hi;
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lo = pio_read32be(port + sizeof(u32));
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hi = pio_read32be(port);
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return lo | (hi << 32);
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}
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static u64 pio_read64be_hi_lo(unsigned long port)
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{
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u64 lo, hi;
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hi = pio_read32be(port);
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lo = pio_read32be(port + sizeof(u32));
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return lo | (hi << 32);
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}
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__no_kmsan_checks
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u64 ioread64_lo_hi(const void __iomem *addr)
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{
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IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr));
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return 0xffffffffffffffffULL;
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}
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__no_kmsan_checks
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u64 ioread64_hi_lo(const void __iomem *addr)
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{
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IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr));
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return 0xffffffffffffffffULL;
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}
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__no_kmsan_checks
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u64 ioread64be_lo_hi(const void __iomem *addr)
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{
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IO_COND(addr, return pio_read64be_lo_hi(port),
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return mmio_read64be(addr));
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return 0xffffffffffffffffULL;
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}
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__no_kmsan_checks
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u64 ioread64be_hi_lo(const void __iomem *addr)
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{
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IO_COND(addr, return pio_read64be_hi_lo(port),
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return mmio_read64be(addr));
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return 0xffffffffffffffffULL;
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}
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EXPORT_SYMBOL(ioread64_lo_hi);
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EXPORT_SYMBOL(ioread64_hi_lo);
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EXPORT_SYMBOL(ioread64be_lo_hi);
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EXPORT_SYMBOL(ioread64be_hi_lo);
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#endif /* readq */
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#ifndef pio_write16be
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#define pio_write16be(val,port) outw(swab16(val),port)
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#define pio_write32be(val,port) outl(swab32(val),port)
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#endif
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#ifndef mmio_write16be
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#define mmio_write16be(val,port) writew(swab16(val),port)
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#define mmio_write32be(val,port) writel(swab32(val),port)
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#define mmio_write64be(val,port) writeq(swab64(val),port)
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#endif
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void iowrite8(u8 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, outb(val,port), writeb(val, addr));
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}
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void iowrite16(u16 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, outw(val,port), writew(val, addr));
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}
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void iowrite16be(u16 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
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}
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void iowrite32(u32 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, outl(val,port), writel(val, addr));
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}
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void iowrite32be(u32 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
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}
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EXPORT_SYMBOL(iowrite8);
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EXPORT_SYMBOL(iowrite16);
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EXPORT_SYMBOL(iowrite16be);
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EXPORT_SYMBOL(iowrite32);
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EXPORT_SYMBOL(iowrite32be);
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#ifdef writeq
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static void pio_write64_lo_hi(u64 val, unsigned long port)
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{
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outl(val, port);
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outl(val >> 32, port + sizeof(u32));
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}
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static void pio_write64_hi_lo(u64 val, unsigned long port)
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{
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outl(val >> 32, port + sizeof(u32));
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outl(val, port);
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}
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static void pio_write64be_lo_hi(u64 val, unsigned long port)
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{
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pio_write32be(val, port + sizeof(u32));
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pio_write32be(val >> 32, port);
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}
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static void pio_write64be_hi_lo(u64 val, unsigned long port)
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{
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pio_write32be(val >> 32, port);
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pio_write32be(val, port + sizeof(u32));
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}
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void iowrite64_lo_hi(u64 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, pio_write64_lo_hi(val, port),
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writeq(val, addr));
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}
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void iowrite64_hi_lo(u64 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, pio_write64_hi_lo(val, port),
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writeq(val, addr));
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}
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void iowrite64be_lo_hi(u64 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, pio_write64be_lo_hi(val, port),
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mmio_write64be(val, addr));
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}
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void iowrite64be_hi_lo(u64 val, void __iomem *addr)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(&val, sizeof(val));
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IO_COND(addr, pio_write64be_hi_lo(val, port),
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mmio_write64be(val, addr));
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}
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EXPORT_SYMBOL(iowrite64_lo_hi);
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EXPORT_SYMBOL(iowrite64_hi_lo);
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EXPORT_SYMBOL(iowrite64be_lo_hi);
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EXPORT_SYMBOL(iowrite64be_hi_lo);
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#endif /* readq */
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/*
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* These are the "repeat MMIO read/write" functions.
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* Note the "__raw" accesses, since we don't want to
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* convert to CPU byte order. We write in "IO byte
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* order" (we also don't have IO barriers).
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*/
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#ifndef mmio_insb
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static inline void mmio_insb(const void __iomem *addr, u8 *dst, int count)
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{
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while (--count >= 0) {
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u8 data = __raw_readb(addr);
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*dst = data;
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dst++;
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}
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}
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static inline void mmio_insw(const void __iomem *addr, u16 *dst, int count)
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{
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while (--count >= 0) {
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u16 data = __raw_readw(addr);
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*dst = data;
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dst++;
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}
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}
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static inline void mmio_insl(const void __iomem *addr, u32 *dst, int count)
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{
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while (--count >= 0) {
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u32 data = __raw_readl(addr);
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*dst = data;
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dst++;
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}
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}
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#endif
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#ifndef mmio_outsb
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static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
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{
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while (--count >= 0) {
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__raw_writeb(*src, addr);
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src++;
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}
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}
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static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
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{
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while (--count >= 0) {
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__raw_writew(*src, addr);
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src++;
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}
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}
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static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
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{
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while (--count >= 0) {
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__raw_writel(*src, addr);
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src++;
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}
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}
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#endif
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void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count)
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{
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IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
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/* KMSAN must treat values read from devices as initialized. */
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kmsan_unpoison_memory(dst, count);
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}
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void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count)
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{
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IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
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/* KMSAN must treat values read from devices as initialized. */
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kmsan_unpoison_memory(dst, count * 2);
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}
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void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count)
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{
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IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
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/* KMSAN must treat values read from devices as initialized. */
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kmsan_unpoison_memory(dst, count * 4);
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}
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EXPORT_SYMBOL(ioread8_rep);
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EXPORT_SYMBOL(ioread16_rep);
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EXPORT_SYMBOL(ioread32_rep);
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void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(src, count);
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IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
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}
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void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(src, count * 2);
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IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
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}
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void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
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{
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/* Make sure uninitialized memory isn't copied to devices. */
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kmsan_check_memory(src, count * 4);
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IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
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}
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EXPORT_SYMBOL(iowrite8_rep);
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EXPORT_SYMBOL(iowrite16_rep);
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EXPORT_SYMBOL(iowrite32_rep);
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#ifdef CONFIG_HAS_IOPORT_MAP
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/* Create a virtual mapping cookie for an IO port range */
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void __iomem *ioport_map(unsigned long port, unsigned int nr)
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{
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if (port > PIO_MASK)
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return NULL;
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return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
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}
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void ioport_unmap(void __iomem *addr)
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{
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/* Nothing to do */
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}
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EXPORT_SYMBOL(ioport_map);
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EXPORT_SYMBOL(ioport_unmap);
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#endif /* CONFIG_HAS_IOPORT_MAP */
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#ifdef CONFIG_PCI
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/* Hide the details if this is a MMIO or PIO address space and just do what
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* you expect in the correct way. */
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void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
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{
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IO_COND(addr, /* nothing */, iounmap(addr));
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}
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EXPORT_SYMBOL(pci_iounmap);
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#endif /* CONFIG_PCI */
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