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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9476df7d80
There are several scenarios where we need to retrieve and update metadata associated with a given devm_memremap_pages() mapping, and the only lookup key available is a pfn in the range: 1/ We want to augment vmemmap_populate() (called via arch_add_memory()) to allocate memmap storage from pre-allocated pages reserved by the device driver. At vmemmap_alloc_block_buf() time it grabs device pages rather than page allocator pages. This is in support of devm_memremap_pages() mappings where the memmap is too large to fit in main memory (i.e. large persistent memory devices). 2/ Taking a reference against the mapping when inserting device pages into the address_space radix of a given inode. This facilitates unmap_mapping_range() and truncate_inode_pages() operations when the driver is tearing down the mapping. 3/ get_user_pages() operations on ZONE_DEVICE memory require taking a reference against the mapping so that the driver teardown path can revoke and drain usage of device pages. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Tested-by: Logan Gunthorpe <logang@deltatee.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
143 lines
4.2 KiB
C
143 lines
4.2 KiB
C
/*
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* Copyright 2006 PathScale, Inc. All Rights Reserved.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _LINUX_IO_H
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#define _LINUX_IO_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <asm/io.h>
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#include <asm/page.h>
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struct device;
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struct resource;
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__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
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void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
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#ifdef CONFIG_MMU
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int ioremap_page_range(unsigned long addr, unsigned long end,
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phys_addr_t phys_addr, pgprot_t prot);
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#else
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static inline int ioremap_page_range(unsigned long addr, unsigned long end,
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phys_addr_t phys_addr, pgprot_t prot)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
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void __init ioremap_huge_init(void);
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int arch_ioremap_pud_supported(void);
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int arch_ioremap_pmd_supported(void);
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#else
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static inline void ioremap_huge_init(void) { }
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#endif
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/*
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* Managed iomap interface
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*/
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#ifdef CONFIG_HAS_IOPORT_MAP
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void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
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unsigned int nr);
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void devm_ioport_unmap(struct device *dev, void __iomem *addr);
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#else
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static inline void __iomem *devm_ioport_map(struct device *dev,
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unsigned long port,
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unsigned int nr)
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{
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return NULL;
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}
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static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
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{
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}
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#endif
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#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
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void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
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resource_size_t size);
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void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
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resource_size_t size);
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void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
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resource_size_t size);
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void devm_iounmap(struct device *dev, void __iomem *addr);
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int check_signature(const volatile void __iomem *io_addr,
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const unsigned char *signature, int length);
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void devm_ioremap_release(struct device *dev, void *res);
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void *devm_memremap(struct device *dev, resource_size_t offset,
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size_t size, unsigned long flags);
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void devm_memunmap(struct device *dev, void *addr);
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void *__devm_memremap_pages(struct device *dev, struct resource *res);
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/*
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* Some systems do not have legacy ISA devices.
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* /dev/port is not a valid interface on these systems.
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* So for those archs, <asm/io.h> should define the following symbol.
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*/
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#ifndef arch_has_dev_port
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#define arch_has_dev_port() (1)
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#endif
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/*
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* Some systems (x86 without PAT) have a somewhat reliable way to mark a
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* physical address range such that uncached mappings will actually
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* end up write-combining. This facility should be used in conjunction
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* with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
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* no effect if the per-page mechanisms are functional.
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* (On x86 without PAT, these functions manipulate MTRRs.)
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*
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* arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
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* to have no effect.
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*/
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#ifndef arch_phys_wc_add
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static inline int __must_check arch_phys_wc_add(unsigned long base,
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unsigned long size)
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{
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return 0; /* It worked (i.e. did nothing). */
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}
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static inline void arch_phys_wc_del(int handle)
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{
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}
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#define arch_phys_wc_add arch_phys_wc_add
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#ifndef arch_phys_wc_index
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static inline int arch_phys_wc_index(int handle)
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{
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return -1;
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}
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#define arch_phys_wc_index arch_phys_wc_index
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#endif
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#endif
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enum {
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/* See memremap() kernel-doc for usage description... */
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MEMREMAP_WB = 1 << 0,
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MEMREMAP_WT = 1 << 1,
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};
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void *memremap(resource_size_t offset, size_t size, unsigned long flags);
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void memunmap(void *addr);
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#endif /* _LINUX_IO_H */
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