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From: Huacai Chen <chenhuacai@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Huacai Chen <chenhuacai@loongson.cn>,
	Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Airlie <airlied@linux.ie>, Jonathan Corbet <corbet@lwn.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-arch <linux-arch@vger.kernel.org>,
	linux-doc@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	Xuefeng Li <lixuefeng@loongson.cn>,
	Yanteng Si <siyanteng@loongson.cn>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH V3 16/22] LoongArch: Add misc common routines
Date: Fri, 17 Sep 2021 14:36:18 +0800	[thread overview]
Message-ID: <CAAhV-H5jE6RdiLm2PZ=3K+dKXcLay+4B1qZx1jQMBJcQM0hHAQ@mail.gmail.com> (raw)
In-Reply-To: <YUQxUgN5AseF7k8F@infradead.org>

Hi, Christoph,

On Fri, Sep 17, 2021 at 2:12 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> > +
> > +/*
> > + * Change "struct page" to physical address.
> > + */
> > +#define page_to_phys(page)   ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
>
> Why is this using a dma_addr_t?  phys_addr_t would be the right type
> here.
Sorry, this is a mistake, I will change to phys_addr_t.

>
> > +
> > +extern void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size);
> > +extern void __init early_iounmap(void __iomem *addr, unsigned long size);
> > +
> > +#define early_memremap early_ioremap
> > +#define early_memunmap early_iounmap
> > +
> > +static inline void __iomem *ioremap_prot(phys_addr_t offset, unsigned long size,
> > +                                      unsigned long prot_val)
> > +{
> > +     if (prot_val == _CACHE_CC)
> > +             return (void __iomem *)(unsigned long)(CAC_BASE + offset);
> > +     else
> > +             return (void __iomem *)(unsigned long)(UNCAC_BASE + offset);
> > +}
>
> There is no real need for this ioremap_prot multiplexer
>
> > +/*
> > + * ioremap_cache -  map bus memory into CPU space
> > + * @offset:      bus address of the memory
> > + * @size:        size of the resource to map
> > + *
> > + * ioremap_cache performs a platform specific sequence of operations to
> > + * make bus memory CPU accessible via the readb/readw/readl/writeb/
> > + * writew/writel functions and the other mmio helpers. The returned
> > + * address is not guaranteed to be usable directly as a virtual
> > + * address.
> > + *
> > + * This version of ioremap ensures that the memory is marked cachable by
> > + * the CPU.  Also enables full write-combining.       Useful for some
> > + * memory-like regions on I/O busses.
> > + */
> > +#define ioremap_cache(offset, size)                          \
> > +     ioremap_prot((offset), (size), _CACHE_CC)
>
> Please don't add ioremap_cache to new ports.
I found there are several call sites in drivers, and I think they
really need a cacheable map.

Huacai

  reply	other threads:[~2021-09-17  6:36 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17  3:57 [PATCH V3 00/22] arch: Add basic LoongArch support Huacai Chen
2021-09-17  3:57 ` [PATCH V3 01/22] Documentation: LoongArch: Add basic documentations Huacai Chen
2021-09-23 20:37   ` Pavel Machek
2021-09-24  4:07     ` Huacai Chen
2021-09-23 20:59   ` Pavel Machek
2021-09-24  4:10     ` Huacai Chen
2021-09-24  6:58       ` Pavel Machek
2021-09-24  7:31         ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 02/22] Documentation/zh_CN: Add basic LoongArch documentations Huacai Chen
2021-09-17  3:57 ` [PATCH V3 03/22] LoongArch: Add elf-related definitions Huacai Chen
2021-09-17  3:57 ` [PATCH V3 04/22] LoongArch: Add writecombine support for drm Huacai Chen
2021-09-17  3:57 ` [PATCH V3 05/22] LoongArch: Add build infrastructure Huacai Chen
2021-09-17  7:53   ` Arnd Bergmann
2021-09-18  4:35     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 06/22] LoongArch: Add CPU definition headers Huacai Chen
2021-09-17  3:57 ` [PATCH V3 07/22] LoongArch: Add atomic/locking headers Huacai Chen
2021-09-17  3:57 ` [PATCH V3 08/22] LoongArch: Add other common headers Huacai Chen
2021-09-17  3:57 ` [PATCH V3 09/22] LoongArch: Add boot and setup routines Huacai Chen
2021-09-17  8:11   ` Arnd Bergmann
2021-09-18  4:54     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 10/22] LoongArch: Add exception/interrupt handling Huacai Chen
2021-09-17  3:57 ` [PATCH V3 11/22] LoongArch: Add process management Huacai Chen
2021-09-17  3:57 ` [PATCH V3 12/22] LoongArch: Add memory management Huacai Chen
2021-09-17  3:57 ` [PATCH V3 13/22] LoongArch: Add system call support Huacai Chen
2021-09-17  8:24   ` Arnd Bergmann
2021-09-18  6:55     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 14/22] LoongArch: Add signal handling support Huacai Chen
2021-09-17  8:26   ` Arnd Bergmann
2021-09-17 21:10   ` Eric W. Biederman
2021-09-18  7:12     ` Huacai Chen
2021-09-19  9:58       ` Arnd Bergmann
2021-09-20  2:36         ` Huacai Chen
2021-09-20 21:14           ` Richard Henderson
2021-09-22  2:43             ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 15/22] LoongArch: Add elf and module support Huacai Chen
2021-09-17  8:28   ` Arnd Bergmann
2021-09-18  7:14     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 16/22] LoongArch: Add misc common routines Huacai Chen
2021-09-17  6:10   ` Christoph Hellwig
2021-09-17  6:36     ` Huacai Chen [this message]
2021-09-17  3:57 ` [PATCH V3 17/22] LoongArch: Add some library functions Huacai Chen
2021-09-17  8:33   ` Arnd Bergmann
2021-09-18  7:16     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 18/22] LoongArch: Add PCI controller support Huacai Chen
2021-09-17  9:02   ` Arnd Bergmann
2021-09-18  7:36     ` Huacai Chen
2021-09-21 22:36       ` Bjorn Helgaas
2021-09-22 15:33         ` Arnd Bergmann
2021-09-17  3:57 ` [PATCH V3 19/22] LoongArch: Add VDSO and VSYSCALL support Huacai Chen
2021-09-17  3:57 ` [PATCH V3 20/22] LoongArch: Add multi-processor (SMP) support Huacai Chen
2021-09-17  9:57   ` Arnd Bergmann
2021-09-18  7:22     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 21/22] LoongArch: Add Non-Uniform Memory Access (NUMA) support Huacai Chen
2021-09-17  6:15   ` Christoph Hellwig
2021-09-17  6:40     ` Huacai Chen
2021-09-17  3:57 ` [PATCH V3 22/22] LoongArch: Add Loongson-3 default config file Huacai Chen
2021-09-17  9:59 ` [PATCH V3 00/22] arch: Add basic LoongArch support Arnd Bergmann

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