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Dan Williams
60e93dc097
Break the requirement that device-dax instances are physically contiguous. With this constraint removed it allows fragmented available capacity to be fully allocated. This capability is useful to mitigate the "noisy neighbor" problem with memory-side-cache management for virtual machines, or any other scenario where a platform address boundary also designates a performance boundary. For example a direct mapped memory side cache might rotate cache colors at 1GB boundaries. With dis-contiguous allocations a device-dax instance could be configured to contain only 1 cache color. It also satisfies Joao's use case (see link) for partitioning memory for exclusive guest access. It allows for a future potential mode where the host kernel need not allocate 'struct page' capacity up-front. Reported-by: Joao Martins <[email protected]> Signed-off-by: Dan Williams <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Ben Skeggs <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Brice Goglin <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Daniel Vetter <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Dave Jiang <[email protected]> Cc: David Airlie <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Hulk Robot <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Ira Weiny <[email protected]> Cc: Jason Gunthorpe <[email protected]> Cc: Jason Yan <[email protected]> Cc: Jeff Moyer <[email protected]> Cc: "Jérôme Glisse" <[email protected]> Cc: Jia He <[email protected]> Cc: Jonathan Cameron <[email protected]> Cc: Juergen Gross <[email protected]> Cc: kernel test robot <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Pavel Tatashin <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: "Rafael J. Wysocki" <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Stefano Stabellini <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: Vishal Verma <[email protected]> Cc: Vivek Goyal <[email protected]> Cc: Wei Yang <[email protected]> Cc: Will Deacon <[email protected]> Link: https://lore.kernel.org/lkml/[email protected]/ Link: https://lkml.kernel.org/r/159643104304.4062302.16561669534797528660.stgit@dwillia2-desk3.amr.corp.intel.com Link: https://lkml.kernel.org/r/160106116875.30709.11456649969327399771.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Linus Torvalds <[email protected]>
40 lines
963 B
C
40 lines
963 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2016, Intel Corporation.
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*/
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#include "test/nfit_test.h"
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#include <linux/mm.h>
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#include "../../../drivers/dax/dax-private.h"
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phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
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unsigned long size)
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{
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int i;
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for (i = 0; i < dev_dax->nr_range; i++) {
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struct dev_dax_range *dax_range = &dev_dax->ranges[i];
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struct range *range = &dax_range->range;
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unsigned long long pgoff_end;
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phys_addr_t addr;
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pgoff_end = dax_range->pgoff + PHYS_PFN(range_len(range)) - 1;
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if (pgoff < dax_range->pgoff || pgoff > pgoff_end)
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continue;
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addr = PFN_PHYS(pgoff - dax_range->pgoff) + range->start;
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if (addr + size - 1 <= range->end) {
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if (get_nfit_res(addr)) {
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struct page *page;
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if (dev_dax->region->align > PAGE_SIZE)
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return -1;
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page = vmalloc_to_page((void *)addr);
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return PFN_PHYS(page_to_pfn(page));
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}
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return addr;
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}
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break;
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}
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return -1;
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}
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