x86, ioremap: Speed up check for RAM pages (c81c8a1e) · Commits · 戴 / test

In __ioremap_caller() (the guts of ioremap), we loop over the range of pfns being remapped and checks each one individually with page_is_ram(). For large ioremaps, this can be very slow. For example, we have a device with a 256 GiB PCI BAR, and ioremapping this BAR can take 20+ seconds -- sometimes long enough to trigger the soft lockup detector! Internally, page_is_ram() calls walk_system_ram_range() on a single page. Instead, we can make a single call to walk_system_ram_range() from __ioremap_caller(), and do our further checks only for any RAM pages that we find. For the common case of MMIO, this saves an enormous amount of work, since the range being ioremapped doesn't intersect system RAM at all. With this change, ioremap on our 256 GiB BAR takes less than 1 second. Signed-off-by:

Roland Dreier <roland@purestorage.com> Link: http://lkml.kernel.org/r/1399054721-1331-1-git-send-email-roland@kernel.org Signed-off-by:

H. Peter Anvin <hpa@linux.intel.com>

arch/x86/mm/ioremap.c

+19 −7

Original line number	Diff line number	Diff line
		@@ -50,6 +50,21 @@ int ioremap_change_attr(unsigned long vaddr, unsigned long size,
		return err;
		}

		static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages,
		void *arg)
		{
		unsigned long i;

		for (i = 0; i < nr_pages; ++i)
		if (pfn_valid(start_pfn + i) &&
		!PageReserved(pfn_to_page(start_pfn + i)))
		return 1;

		WARN_ONCE(1, "ioremap on RAM pfn 0x%lx\n", start_pfn);

		return 0;
		}

		/*
		* Remap an arbitrary physical address space into the kernel virtual
		* address space. Needed when the kernel wants to access high addresses
		@@ -93,14 +108,11 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
		/*
		* Don't allow anybody to remap normal RAM that we're using..
		*/
		pfn = phys_addr >> PAGE_SHIFT;
		last_pfn = last_addr >> PAGE_SHIFT;
		for (pfn = phys_addr >> PAGE_SHIFT; pfn <= last_pfn; pfn++) {
		int is_ram = page_is_ram(pfn);

		if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))
		if (walk_system_ram_range(pfn, last_pfn - pfn + 1, NULL,
		__ioremap_check_ram) == 1)
		return NULL;
		WARN_ON_ONCE(is_ram);
		}

		/*
		* Mappings have to be page-aligned

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