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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c1f64a5800
On Tue, 27 May 2008, Linus Torvalds wrote: > > Expecting people to fix up all drivers is simply not going to happen. And > serializing things shouldn't be *that* expensive. People who cannot take > the expense can continue to use the magic __raw_writel() etc stuff. Of course, for non-x86, you kind of have to expect drivers to be well-behaved, so non-x86 can probably avoid this simply because there are less relevant drivers involved. Here's a UNTESTED patch for x86 that may or may not compile and work, and which serializes (on a compiler level) the IO accesses against regular memory accesses. __read[bwlq]()/__write[bwlq]() are not serialized with a :"memory" barrier, although since they still use "asm volatile" I suspect that i practice they are probably serial too. Did not look very closely at any generated code (only did a trivial test to see that the code looks *roughly* correct). Signed-off-by: Ingo Molnar <mingo@elte.hu>
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
#ifndef _ASM_X86_IO_H
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#define _ASM_X86_IO_H
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#define ARCH_HAS_IOREMAP_WC
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#include <linux/compiler.h>
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#define build_mmio_read(name, size, type, reg, barrier) \
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static inline type name(const volatile void __iomem *addr) \
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{ type ret; asm volatile("mov" size " %1,%0":"=" reg (ret) \
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:"m" (*(volatile type __force *)addr) barrier); return ret; }
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#define build_mmio_write(name, size, type, reg, barrier) \
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static inline void name(type val, volatile void __iomem *addr) \
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{ asm volatile("mov" size " %0,%1": :reg (val), \
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"m" (*(volatile type __force *)addr) barrier); }
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build_mmio_read(readb, "b", unsigned char, "q", :"memory")
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build_mmio_read(readw, "w", unsigned short, "r", :"memory")
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build_mmio_read(readl, "l", unsigned int, "r", :"memory")
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build_mmio_read(__readb, "b", unsigned char, "q", )
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build_mmio_read(__readw, "w", unsigned short, "r", )
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build_mmio_read(__readl, "l", unsigned int, "r", )
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build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
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build_mmio_write(writew, "w", unsigned short, "r", :"memory")
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build_mmio_write(writel, "l", unsigned int, "r", :"memory")
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build_mmio_write(__writeb, "b", unsigned char, "q", )
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build_mmio_write(__writew, "w", unsigned short, "r", )
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build_mmio_write(__writel, "l", unsigned int, "r", )
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#define readb_relaxed(a) __readb(a)
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#define readw_relaxed(a) __readw(a)
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#define readl_relaxed(a) __readl(a)
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#define __raw_readb __readb
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#define __raw_readw __readw
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#define __raw_readl __readl
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#define __raw_writeb __writeb
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#define __raw_writew __writew
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#define __raw_writel __writel
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#define mmiowb() barrier()
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#ifdef CONFIG_X86_64
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build_mmio_read(readq, "q", unsigned long, "r", :"memory")
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build_mmio_read(__readq, "q", unsigned long, "r", )
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build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
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build_mmio_write(__writeq, "q", unsigned long, "r", )
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#define readq_relaxed(a) __readq(a)
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#define __raw_readq __readq
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#define __raw_writeq writeq
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/* Let people know we have them */
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#define readq readq
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#define writeq writeq
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#endif
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#ifdef CONFIG_X86_32
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# include "io_32.h"
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#else
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# include "io_64.h"
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#endif
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extern void *xlate_dev_mem_ptr(unsigned long phys);
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extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
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extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
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unsigned long prot_val);
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extern void __iomem *ioremap_wc(unsigned long offset, unsigned long size);
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#endif /* _ASM_X86_IO_H */
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