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omap iommu: simple virtual address space management
This patch provides a device drivers, which has a omap iommu, with
address mapping APIs between device virtual address(iommu), physical
address and MPU virtual address.
There are 4 possible patterns for iommu virtual address(iova/da) mapping.
|iova/ mapping iommu_ page
| da pa va (d)-(p)-(v) function type
---------------------------------------------------------------------------
1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s
2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s
3 | c d c 1 - n - 1 _vmap() / _vunmap() s
4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n*
'iova': device iommu virtual address
'da': alias of 'iova'
'pa': physical address
'va': mpu virtual address
'c': contiguous memory area
'd': dicontiguous memory area
'a': anonymous memory allocation
'()': optional feature
'n': a normal page(4KB) size is used.
's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used.
'*': not yet, but feasible.
Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
This commit is contained in:
Hiroshi DOYU
parent
066aa9c1e3
commit
69d3a84a64
5 changed files with 1005 additions and 0 deletions
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@ -30,6 +30,14 @@ struct map_desc {
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#ifdef CONFIG_MMU
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extern void iotable_init(struct map_desc *, int);
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struct mem_type;
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extern const struct mem_type *get_mem_type(unsigned int type);
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/*
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* external interface to remap single page with appropriate type
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*/
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extern int ioremap_page(unsigned long virt, unsigned long phys,
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const struct mem_type *mtype);
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#else
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#define iotable_init(map,num) do { } while (0)
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#endif
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@ -110,6 +110,12 @@ static int remap_area_pages(unsigned long start, unsigned long pfn,
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return err;
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}
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int ioremap_page(unsigned long virt, unsigned long phys,
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const struct mem_type *mtype)
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{
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return remap_area_pages(virt, __phys_to_pfn(phys), PAGE_SIZE, mtype);
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}
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EXPORT_SYMBOL(ioremap_page);
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void __check_kvm_seq(struct mm_struct *mm)
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{
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@ -255,6 +255,7 @@ const struct mem_type *get_mem_type(unsigned int type)
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{
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return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL;
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}
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EXPORT_SYMBOL(get_mem_type);
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/*
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* Adjust the PMD section entries according to the CPU in use.
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94
arch/arm/plat-omap/include/mach/iovmm.h
Normal file
94
arch/arm/plat-omap/include/mach/iovmm.h
Normal file
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@ -0,0 +1,94 @@
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/*
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* omap iommu: simple virtual address space management
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __IOMMU_MMAP_H
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#define __IOMMU_MMAP_H
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struct iovm_struct {
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struct iommu *iommu; /* iommu object which this belongs to */
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u32 da_start; /* area definition */
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u32 da_end;
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u32 flags; /* IOVMF_: see below */
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struct list_head list; /* linked in ascending order */
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const struct sg_table *sgt; /* keep 'page' <-> 'da' mapping */
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void *va; /* mpu side mapped address */
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};
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/*
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* IOVMF_FLAGS: attribute for iommu virtual memory area(iovma)
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*
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* lower 16 bit is used for h/w and upper 16 bit is for s/w.
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*/
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#define IOVMF_SW_SHIFT 16
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#define IOVMF_HW_SIZE (1 << IOVMF_SW_SHIFT)
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#define IOVMF_HW_MASK (IOVMF_HW_SIZE - 1)
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#define IOVMF_SW_MASK (~IOVMF_HW_MASK)UL
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/*
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* iovma: h/w flags derived from cam and ram attribute
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*/
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#define IOVMF_CAM_MASK (~((1 << 10) - 1))
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#define IOVMF_RAM_MASK (~IOVMF_CAM_MASK)
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#define IOVMF_PGSZ_MASK (3 << 0)
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#define IOVMF_PGSZ_1M MMU_CAM_PGSZ_1M
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#define IOVMF_PGSZ_64K MMU_CAM_PGSZ_64K
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#define IOVMF_PGSZ_4K MMU_CAM_PGSZ_4K
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#define IOVMF_PGSZ_16M MMU_CAM_PGSZ_16M
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#define IOVMF_ENDIAN_MASK (1 << 9)
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#define IOVMF_ENDIAN_BIG MMU_RAM_ENDIAN_BIG
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#define IOVMF_ENDIAN_LITTLE MMU_RAM_ENDIAN_LITTLE
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#define IOVMF_ELSZ_MASK (3 << 7)
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#define IOVMF_ELSZ_8 MMU_RAM_ELSZ_8
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#define IOVMF_ELSZ_16 MMU_RAM_ELSZ_16
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#define IOVMF_ELSZ_32 MMU_RAM_ELSZ_32
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#define IOVMF_ELSZ_NONE MMU_RAM_ELSZ_NONE
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#define IOVMF_MIXED_MASK (1 << 6)
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#define IOVMF_MIXED MMU_RAM_MIXED
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/*
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* iovma: s/w flags, used for mapping and umapping internally.
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*/
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#define IOVMF_MMIO (1 << IOVMF_SW_SHIFT)
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#define IOVMF_ALLOC (2 << IOVMF_SW_SHIFT)
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#define IOVMF_ALLOC_MASK (3 << IOVMF_SW_SHIFT)
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/* "superpages" is supported just with physically linear pages */
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#define IOVMF_DISCONT (1 << (2 + IOVMF_SW_SHIFT))
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#define IOVMF_LINEAR (2 << (2 + IOVMF_SW_SHIFT))
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#define IOVMF_LINEAR_MASK (3 << (2 + IOVMF_SW_SHIFT))
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#define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT))
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#define IOVMF_DA_ANON (2 << (4 + IOVMF_SW_SHIFT))
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#define IOVMF_DA_MASK (3 << (4 + IOVMF_SW_SHIFT))
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extern struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da);
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extern u32 iommu_vmap(struct iommu *obj, u32 da,
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const struct sg_table *sgt, u32 flags);
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extern struct sg_table *iommu_vunmap(struct iommu *obj, u32 da);
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extern u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes,
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u32 flags);
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extern void iommu_vfree(struct iommu *obj, const u32 da);
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extern u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
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u32 flags);
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extern void iommu_kunmap(struct iommu *obj, u32 da);
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extern u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes,
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u32 flags);
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extern void iommu_kfree(struct iommu *obj, u32 da);
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extern void *da_to_va(struct iommu *obj, u32 da);
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#endif /* __IOMMU_MMAP_H */
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896
arch/arm/plat-omap/iovmm.c
Normal file
896
arch/arm/plat-omap/iovmm.c
Normal file
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@ -0,0 +1,896 @@
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/*
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* omap iommu: simple virtual address space management
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/vmalloc.h>
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#include <linux/device.h>
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#include <linux/scatterlist.h>
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#include <asm/cacheflush.h>
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#include <asm/mach/map.h>
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#include <mach/iommu.h>
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#include <mach/iovmm.h>
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#include "iopgtable.h"
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/*
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* A device driver needs to create address mappings between:
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*
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* - iommu/device address
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* - physical address
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* - mpu virtual address
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*
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* There are 4 possible patterns for them:
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*
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* |iova/ mapping iommu_ page
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* | da pa va (d)-(p)-(v) function type
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* ---------------------------------------------------------------------------
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* 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s
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* 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s
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* 3 | c d c 1 - n - 1 _vmap() / _vunmap() s
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* 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n*
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*
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*
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* 'iova': device iommu virtual address
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* 'da': alias of 'iova'
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* 'pa': physical address
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* 'va': mpu virtual address
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*
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* 'c': contiguous memory area
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* 'd': dicontiguous memory area
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* 'a': anonymous memory allocation
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* '()': optional feature
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*
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* 'n': a normal page(4KB) size is used.
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* 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used.
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*
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* '*': not yet, but feasible.
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*/
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static struct kmem_cache *iovm_area_cachep;
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/* return total bytes of sg buffers */
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static size_t sgtable_len(const struct sg_table *sgt)
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{
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unsigned int i, total = 0;
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struct scatterlist *sg;
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if (!sgt)
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return 0;
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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size_t bytes;
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bytes = sg_dma_len(sg);
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if (!iopgsz_ok(bytes)) {
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pr_err("%s: sg[%d] not iommu pagesize(%x)\n",
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__func__, i, bytes);
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return 0;
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}
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total += bytes;
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}
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return total;
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}
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#define sgtable_ok(x) (!!sgtable_len(x))
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/*
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* calculate the optimal number sg elements from total bytes based on
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* iommu superpages
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*/
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static unsigned int sgtable_nents(size_t bytes)
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{
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int i;
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unsigned int nr_entries;
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const unsigned long pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
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if (!IS_ALIGNED(bytes, PAGE_SIZE)) {
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pr_err("%s: wrong size %08x\n", __func__, bytes);
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return 0;
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}
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nr_entries = 0;
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for (i = 0; i < ARRAY_SIZE(pagesize); i++) {
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if (bytes >= pagesize[i]) {
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nr_entries += (bytes / pagesize[i]);
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bytes %= pagesize[i];
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}
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}
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BUG_ON(bytes);
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return nr_entries;
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}
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/* allocate and initialize sg_table header(a kind of 'superblock') */
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static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags)
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{
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unsigned int nr_entries;
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int err;
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struct sg_table *sgt;
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if (!bytes)
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return ERR_PTR(-EINVAL);
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if (!IS_ALIGNED(bytes, PAGE_SIZE))
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return ERR_PTR(-EINVAL);
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/* FIXME: IOVMF_DA_FIXED should support 'superpages' */
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if ((flags & IOVMF_LINEAR) && (flags & IOVMF_DA_ANON)) {
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nr_entries = sgtable_nents(bytes);
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if (!nr_entries)
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return ERR_PTR(-EINVAL);
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} else
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nr_entries = bytes / PAGE_SIZE;
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sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return ERR_PTR(-ENOMEM);
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err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL);
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if (err)
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return ERR_PTR(err);
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pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries);
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return sgt;
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}
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/* free sg_table header(a kind of superblock) */
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static void sgtable_free(struct sg_table *sgt)
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{
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if (!sgt)
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return;
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sg_free_table(sgt);
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kfree(sgt);
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pr_debug("%s: sgt:%p\n", __func__, sgt);
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}
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/* map 'sglist' to a contiguous mpu virtual area and return 'va' */
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static void *vmap_sg(const struct sg_table *sgt)
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{
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u32 va;
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size_t total;
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unsigned int i;
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struct scatterlist *sg;
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struct vm_struct *new;
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const struct mem_type *mtype;
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mtype = get_mem_type(MT_DEVICE);
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if (!mtype)
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return ERR_PTR(-EINVAL);
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total = sgtable_len(sgt);
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if (!total)
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return ERR_PTR(-EINVAL);
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new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END);
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if (!new)
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return ERR_PTR(-ENOMEM);
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va = (u32)new->addr;
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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size_t bytes;
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u32 pa;
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int err;
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pa = sg_phys(sg);
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bytes = sg_dma_len(sg);
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BUG_ON(bytes != PAGE_SIZE);
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err = ioremap_page(va, pa, mtype);
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if (err)
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goto err_out;
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va += bytes;
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}
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flush_cache_vmap(new->addr, total);
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return new->addr;
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err_out:
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WARN_ON(1); /* FIXME: cleanup some mpu mappings */
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vunmap(new->addr);
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return ERR_PTR(-EAGAIN);
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}
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static inline void vunmap_sg(const void *va)
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{
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vunmap(va);
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}
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static struct iovm_struct *__find_iovm_area(struct iommu *obj, const u32 da)
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{
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struct iovm_struct *tmp;
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list_for_each_entry(tmp, &obj->mmap, list) {
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if ((da >= tmp->da_start) && (da < tmp->da_end)) {
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size_t len;
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len = tmp->da_end - tmp->da_start;
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dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n",
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__func__, tmp->da_start, da, tmp->da_end, len,
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tmp->flags);
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return tmp;
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}
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}
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return NULL;
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}
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/**
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* find_iovm_area - find iovma which includes @da
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* @da: iommu device virtual address
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*
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* Find the existing iovma starting at @da
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*/
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struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da)
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{
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struct iovm_struct *area;
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mutex_lock(&obj->mmap_lock);
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area = __find_iovm_area(obj, da);
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mutex_unlock(&obj->mmap_lock);
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return area;
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}
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EXPORT_SYMBOL_GPL(find_iovm_area);
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/*
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* This finds the hole(area) which fits the requested address and len
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* in iovmas mmap, and returns the new allocated iovma.
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*/
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static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
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size_t bytes, u32 flags)
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{
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struct iovm_struct *new, *tmp;
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u32 start, prev_end, alignement;
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if (!obj || !bytes)
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return ERR_PTR(-EINVAL);
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start = da;
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alignement = PAGE_SIZE;
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if (flags & IOVMF_DA_ANON) {
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/*
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* Reserve the first page for NULL
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*/
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start = PAGE_SIZE;
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if (flags & IOVMF_LINEAR)
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alignement = iopgsz_max(bytes);
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start = roundup(start, alignement);
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}
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tmp = NULL;
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if (list_empty(&obj->mmap))
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goto found;
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prev_end = 0;
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list_for_each_entry(tmp, &obj->mmap, list) {
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if ((prev_end <= start) && (start + bytes < tmp->da_start))
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goto found;
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if (flags & IOVMF_DA_ANON)
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start = roundup(tmp->da_end, alignement);
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prev_end = tmp->da_end;
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}
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if ((start >= prev_end) && (ULONG_MAX - start >= bytes))
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goto found;
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dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n",
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__func__, da, bytes, flags);
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return ERR_PTR(-EINVAL);
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found:
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new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL);
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if (!new)
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return ERR_PTR(-ENOMEM);
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new->iommu = obj;
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new->da_start = start;
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new->da_end = start + bytes;
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new->flags = flags;
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/*
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* keep ascending order of iovmas
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||||
*/
|
||||
if (tmp)
|
||||
list_add_tail(&new->list, &tmp->list);
|
||||
else
|
||||
list_add(&new->list, &obj->mmap);
|
||||
|
||||
dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n",
|
||||
__func__, new->da_start, start, new->da_end, bytes, flags);
|
||||
|
||||
return new;
|
||||
}
|
||||
|
||||
static void free_iovm_area(struct iommu *obj, struct iovm_struct *area)
|
||||
{
|
||||
size_t bytes;
|
||||
|
||||
BUG_ON(!obj || !area);
|
||||
|
||||
bytes = area->da_end - area->da_start;
|
||||
|
||||
dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n",
|
||||
__func__, area->da_start, area->da_end, bytes, area->flags);
|
||||
|
||||
list_del(&area->list);
|
||||
kmem_cache_free(iovm_area_cachep, area);
|
||||
}
|
||||
|
||||
/**
|
||||
* da_to_va - convert (d) to (v)
|
||||
* @obj: objective iommu
|
||||
* @da: iommu device virtual address
|
||||
* @va: mpu virtual address
|
||||
*
|
||||
* Returns mpu virtual addr which corresponds to a given device virtual addr
|
||||
*/
|
||||
void *da_to_va(struct iommu *obj, u32 da)
|
||||
{
|
||||
void *va = NULL;
|
||||
struct iovm_struct *area;
|
||||
|
||||
mutex_lock(&obj->mmap_lock);
|
||||
|
||||
area = __find_iovm_area(obj, da);
|
||||
if (!area) {
|
||||
dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
|
||||
goto out;
|
||||
}
|
||||
va = area->va;
|
||||
mutex_unlock(&obj->mmap_lock);
|
||||
out:
|
||||
return va;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(da_to_va);
|
||||
|
||||
static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
|
||||
{
|
||||
unsigned int i;
|
||||
struct scatterlist *sg;
|
||||
void *va = _va;
|
||||
void *va_end;
|
||||
|
||||
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
|
||||
struct page *pg;
|
||||
const size_t bytes = PAGE_SIZE;
|
||||
|
||||
/*
|
||||
* iommu 'superpage' isn't supported with 'iommu_vmalloc()'
|
||||
*/
|
||||
pg = vmalloc_to_page(va);
|
||||
BUG_ON(!pg);
|
||||
sg_set_page(sg, pg, bytes, 0);
|
||||
|
||||
va += bytes;
|
||||
}
|
||||
|
||||
va_end = _va + PAGE_SIZE * i;
|
||||
flush_cache_vmap(_va, va_end);
|
||||
}
|
||||
|
||||
static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
|
||||
{
|
||||
/*
|
||||
* Actually this is not necessary at all, just exists for
|
||||
* consistency of the code readibility.
|
||||
*/
|
||||
BUG_ON(!sgt);
|
||||
}
|
||||
|
||||
static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len)
|
||||
{
|
||||
unsigned int i;
|
||||
struct scatterlist *sg;
|
||||
void *va;
|
||||
|
||||
va = phys_to_virt(pa);
|
||||
|
||||
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
|
||||
size_t bytes;
|
||||
|
||||
bytes = iopgsz_max(len);
|
||||
|
||||
BUG_ON(!iopgsz_ok(bytes));
|
||||
|
||||
sg_set_buf(sg, phys_to_virt(pa), bytes);
|
||||
/*
|
||||
* 'pa' is cotinuous(linear).
|
||||
*/
|
||||
pa += bytes;
|
||||
len -= bytes;
|
||||
}
|
||||
BUG_ON(len);
|
||||
|
||||
clean_dcache_area(va, len);
|
||||
}
|
||||
|
||||
static inline void sgtable_drain_kmalloc(struct sg_table *sgt)
|
||||
{
|
||||
/*
|
||||
* Actually this is not necessary at all, just exists for
|
||||
* consistency of the code readibility
|
||||
*/
|
||||
BUG_ON(!sgt);
|
||||
}
|
||||
|
||||
/* create 'da' <-> 'pa' mapping from 'sgt' */
|
||||
static int map_iovm_area(struct iommu *obj, struct iovm_struct *new,
|
||||
const struct sg_table *sgt, u32 flags)
|
||||
{
|
||||
int err;
|
||||
unsigned int i, j;
|
||||
struct scatterlist *sg;
|
||||
u32 da = new->da_start;
|
||||
|
||||
if (!obj || !new || !sgt)
|
||||
return -EINVAL;
|
||||
|
||||
BUG_ON(!sgtable_ok(sgt));
|
||||
|
||||
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
|
||||
u32 pa;
|
||||
int pgsz;
|
||||
size_t bytes;
|
||||
struct iotlb_entry e;
|
||||
|
||||
pa = sg_phys(sg);
|
||||
bytes = sg_dma_len(sg);
|
||||
|
||||
flags &= ~IOVMF_PGSZ_MASK;
|
||||
pgsz = bytes_to_iopgsz(bytes);
|
||||
if (pgsz < 0)
|
||||
goto err_out;
|
||||
flags |= pgsz;
|
||||
|
||||
pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
|
||||
i, da, pa, bytes);
|
||||
|
||||
iotlb_init_entry(&e, da, pa, flags);
|
||||
err = iopgtable_store_entry(obj, &e);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
da += bytes;
|
||||
}
|
||||
return 0;
|
||||
|
||||
err_out:
|
||||
da = new->da_start;
|
||||
|
||||
for_each_sg(sgt->sgl, sg, i, j) {
|
||||
size_t bytes;
|
||||
|
||||
bytes = iopgtable_clear_entry(obj, da);
|
||||
|
||||
BUG_ON(!iopgsz_ok(bytes));
|
||||
|
||||
da += bytes;
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
/* release 'da' <-> 'pa' mapping */
|
||||
static void unmap_iovm_area(struct iommu *obj, struct iovm_struct *area)
|
||||
{
|
||||
u32 start;
|
||||
size_t total = area->da_end - area->da_start;
|
||||
|
||||
BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE));
|
||||
|
||||
start = area->da_start;
|
||||
while (total > 0) {
|
||||
size_t bytes;
|
||||
|
||||
bytes = iopgtable_clear_entry(obj, start);
|
||||
if (bytes == 0)
|
||||
bytes = PAGE_SIZE;
|
||||
else
|
||||
dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
|
||||
__func__, start, bytes, area->flags);
|
||||
|
||||
BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
|
||||
|
||||
total -= bytes;
|
||||
start += bytes;
|
||||
}
|
||||
BUG_ON(total);
|
||||
}
|
||||
|
||||
/* template function for all unmapping */
|
||||
static struct sg_table *unmap_vm_area(struct iommu *obj, const u32 da,
|
||||
void (*fn)(const void *), u32 flags)
|
||||
{
|
||||
struct sg_table *sgt = NULL;
|
||||
struct iovm_struct *area;
|
||||
|
||||
if (!IS_ALIGNED(da, PAGE_SIZE)) {
|
||||
dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
mutex_lock(&obj->mmap_lock);
|
||||
|
||||
area = __find_iovm_area(obj, da);
|
||||
if (!area) {
|
||||
dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
|
||||
goto out;
|
||||
}
|
||||
|
||||
if ((area->flags & flags) != flags) {
|
||||
dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__,
|
||||
area->flags);
|
||||
goto out;
|
||||
}
|
||||
sgt = (struct sg_table *)area->sgt;
|
||||
|
||||
unmap_iovm_area(obj, area);
|
||||
|
||||
fn(area->va);
|
||||
|
||||
dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__,
|
||||
area->da_start, da, area->da_end,
|
||||
area->da_end - area->da_start, area->flags);
|
||||
|
||||
free_iovm_area(obj, area);
|
||||
out:
|
||||
mutex_unlock(&obj->mmap_lock);
|
||||
|
||||
return sgt;
|
||||
}
|
||||
|
||||
static u32 map_iommu_region(struct iommu *obj, u32 da,
|
||||
const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
|
||||
{
|
||||
int err = -ENOMEM;
|
||||
struct iovm_struct *new;
|
||||
|
||||
mutex_lock(&obj->mmap_lock);
|
||||
|
||||
new = alloc_iovm_area(obj, da, bytes, flags);
|
||||
if (IS_ERR(new)) {
|
||||
err = PTR_ERR(new);
|
||||
goto err_alloc_iovma;
|
||||
}
|
||||
new->va = va;
|
||||
new->sgt = sgt;
|
||||
|
||||
if (map_iovm_area(obj, new, sgt, new->flags))
|
||||
goto err_map;
|
||||
|
||||
mutex_unlock(&obj->mmap_lock);
|
||||
|
||||
dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n",
|
||||
__func__, new->da_start, bytes, new->flags, va);
|
||||
|
||||
return new->da_start;
|
||||
|
||||
err_map:
|
||||
free_iovm_area(obj, new);
|
||||
err_alloc_iovma:
|
||||
mutex_unlock(&obj->mmap_lock);
|
||||
return err;
|
||||
}
|
||||
|
||||
static inline u32 __iommu_vmap(struct iommu *obj, u32 da,
|
||||
const struct sg_table *sgt, void *va, size_t bytes, u32 flags)
|
||||
{
|
||||
return map_iommu_region(obj, da, sgt, va, bytes, flags);
|
||||
}
|
||||
|
||||
/**
|
||||
* iommu_vmap - (d)-(p)-(v) address mapper
|
||||
* @obj: objective iommu
|
||||
* @sgt: address of scatter gather table
|
||||
* @flags: iovma and page property
|
||||
*
|
||||
* Creates 1-n-1 mapping with given @sgt and returns @da.
|
||||
* All @sgt element must be io page size aligned.
|
||||
*/
|
||||
u32 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt,
|
||||
u32 flags)
|
||||
{
|
||||
size_t bytes;
|
||||
void *va;
|
||||
|
||||
if (!obj || !obj->dev || !sgt)
|
||||
return -EINVAL;
|
||||
|
||||
bytes = sgtable_len(sgt);
|
||||
if (!bytes)
|
||||
return -EINVAL;
|
||||
bytes = PAGE_ALIGN(bytes);
|
||||
|
||||
va = vmap_sg(sgt);
|
||||
if (IS_ERR(va))
|
||||
return PTR_ERR(va);
|
||||
|
||||
flags &= IOVMF_HW_MASK;
|
||||
flags |= IOVMF_DISCONT;
|
||||
flags |= IOVMF_MMIO;
|
||||
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
|
||||
|
||||
da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
|
||||
if (IS_ERR_VALUE(da))
|
||||
vunmap_sg(va);
|
||||
|
||||
return da;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_vmap);
|
||||
|
||||
/**
|
||||
* iommu_vunmap - release virtual mapping obtained by 'iommu_vmap()'
|
||||
* @obj: objective iommu
|
||||
* @da: iommu device virtual address
|
||||
*
|
||||
* Free the iommu virtually contiguous memory area starting at
|
||||
* @da, which was returned by 'iommu_vmap()'.
|
||||
*/
|
||||
struct sg_table *iommu_vunmap(struct iommu *obj, u32 da)
|
||||
{
|
||||
struct sg_table *sgt;
|
||||
/*
|
||||
* 'sgt' is allocated before 'iommu_vmalloc()' is called.
|
||||
* Just returns 'sgt' to the caller to free
|
||||
*/
|
||||
sgt = unmap_vm_area(obj, da, vunmap_sg, IOVMF_DISCONT | IOVMF_MMIO);
|
||||
if (!sgt)
|
||||
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
|
||||
return sgt;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_vunmap);
|
||||
|
||||
/**
|
||||
* iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
|
||||
* @obj: objective iommu
|
||||
* @da: contiguous iommu virtual memory
|
||||
* @bytes: allocation size
|
||||
* @flags: iovma and page property
|
||||
*
|
||||
* Allocate @bytes linearly and creates 1-n-1 mapping and returns
|
||||
* @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
|
||||
*/
|
||||
u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
|
||||
{
|
||||
void *va;
|
||||
struct sg_table *sgt;
|
||||
|
||||
if (!obj || !obj->dev || !bytes)
|
||||
return -EINVAL;
|
||||
|
||||
bytes = PAGE_ALIGN(bytes);
|
||||
|
||||
va = vmalloc(bytes);
|
||||
if (!va)
|
||||
return -ENOMEM;
|
||||
|
||||
sgt = sgtable_alloc(bytes, flags);
|
||||
if (IS_ERR(sgt)) {
|
||||
da = PTR_ERR(sgt);
|
||||
goto err_sgt_alloc;
|
||||
}
|
||||
sgtable_fill_vmalloc(sgt, va);
|
||||
|
||||
flags &= IOVMF_HW_MASK;
|
||||
flags |= IOVMF_DISCONT;
|
||||
flags |= IOVMF_ALLOC;
|
||||
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
|
||||
|
||||
da = __iommu_vmap(obj, da, sgt, va, bytes, flags);
|
||||
if (IS_ERR_VALUE(da))
|
||||
goto err_iommu_vmap;
|
||||
|
||||
return da;
|
||||
|
||||
err_iommu_vmap:
|
||||
sgtable_drain_vmalloc(sgt);
|
||||
sgtable_free(sgt);
|
||||
err_sgt_alloc:
|
||||
vfree(va);
|
||||
return da;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_vmalloc);
|
||||
|
||||
/**
|
||||
* iommu_vfree - release memory allocated by 'iommu_vmalloc()'
|
||||
* @obj: objective iommu
|
||||
* @da: iommu device virtual address
|
||||
*
|
||||
* Frees the iommu virtually continuous memory area starting at
|
||||
* @da, as obtained from 'iommu_vmalloc()'.
|
||||
*/
|
||||
void iommu_vfree(struct iommu *obj, const u32 da)
|
||||
{
|
||||
struct sg_table *sgt;
|
||||
|
||||
sgt = unmap_vm_area(obj, da, vfree, IOVMF_DISCONT | IOVMF_ALLOC);
|
||||
if (!sgt)
|
||||
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
|
||||
sgtable_free(sgt);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_vfree);
|
||||
|
||||
static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va,
|
||||
size_t bytes, u32 flags)
|
||||
{
|
||||
struct sg_table *sgt;
|
||||
|
||||
sgt = sgtable_alloc(bytes, flags);
|
||||
if (IS_ERR(sgt))
|
||||
return PTR_ERR(sgt);
|
||||
|
||||
sgtable_fill_kmalloc(sgt, pa, bytes);
|
||||
|
||||
da = map_iommu_region(obj, da, sgt, va, bytes, flags);
|
||||
if (IS_ERR_VALUE(da)) {
|
||||
sgtable_drain_kmalloc(sgt);
|
||||
sgtable_free(sgt);
|
||||
}
|
||||
|
||||
return da;
|
||||
}
|
||||
|
||||
/**
|
||||
* iommu_kmap - (d)-(p)-(v) address mapper
|
||||
* @obj: objective iommu
|
||||
* @da: contiguous iommu virtual memory
|
||||
* @pa: contiguous physical memory
|
||||
* @flags: iovma and page property
|
||||
*
|
||||
* Creates 1-1-1 mapping and returns @da again, which can be
|
||||
* adjusted if 'IOVMF_DA_ANON' is set.
|
||||
*/
|
||||
u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes,
|
||||
u32 flags)
|
||||
{
|
||||
void *va;
|
||||
|
||||
if (!obj || !obj->dev || !bytes)
|
||||
return -EINVAL;
|
||||
|
||||
bytes = PAGE_ALIGN(bytes);
|
||||
|
||||
va = ioremap(pa, bytes);
|
||||
if (!va)
|
||||
return -ENOMEM;
|
||||
|
||||
flags &= IOVMF_HW_MASK;
|
||||
flags |= IOVMF_LINEAR;
|
||||
flags |= IOVMF_MMIO;
|
||||
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
|
||||
|
||||
da = __iommu_kmap(obj, da, pa, va, bytes, flags);
|
||||
if (IS_ERR_VALUE(da))
|
||||
iounmap(va);
|
||||
|
||||
return da;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_kmap);
|
||||
|
||||
/**
|
||||
* iommu_kunmap - release virtual mapping obtained by 'iommu_kmap()'
|
||||
* @obj: objective iommu
|
||||
* @da: iommu device virtual address
|
||||
*
|
||||
* Frees the iommu virtually contiguous memory area starting at
|
||||
* @da, which was passed to and was returned by'iommu_kmap()'.
|
||||
*/
|
||||
void iommu_kunmap(struct iommu *obj, u32 da)
|
||||
{
|
||||
struct sg_table *sgt;
|
||||
typedef void (*func_t)(const void *);
|
||||
|
||||
sgt = unmap_vm_area(obj, da, (func_t)__iounmap,
|
||||
IOVMF_LINEAR | IOVMF_MMIO);
|
||||
if (!sgt)
|
||||
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
|
||||
sgtable_free(sgt);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_kunmap);
|
||||
|
||||
/**
|
||||
* iommu_kmalloc - (d)-(p)-(v) address allocator and mapper
|
||||
* @obj: objective iommu
|
||||
* @da: contiguous iommu virtual memory
|
||||
* @bytes: bytes for allocation
|
||||
* @flags: iovma and page property
|
||||
*
|
||||
* Allocate @bytes linearly and creates 1-1-1 mapping and returns
|
||||
* @da again, which might be adjusted if 'IOVMF_DA_ANON' is set.
|
||||
*/
|
||||
u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags)
|
||||
{
|
||||
void *va;
|
||||
u32 pa;
|
||||
|
||||
if (!obj || !obj->dev || !bytes)
|
||||
return -EINVAL;
|
||||
|
||||
bytes = PAGE_ALIGN(bytes);
|
||||
|
||||
va = kmalloc(bytes, GFP_KERNEL | GFP_DMA);
|
||||
if (!va)
|
||||
return -ENOMEM;
|
||||
pa = virt_to_phys(va);
|
||||
|
||||
flags &= IOVMF_HW_MASK;
|
||||
flags |= IOVMF_LINEAR;
|
||||
flags |= IOVMF_ALLOC;
|
||||
flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON);
|
||||
|
||||
da = __iommu_kmap(obj, da, pa, va, bytes, flags);
|
||||
if (IS_ERR_VALUE(da))
|
||||
kfree(va);
|
||||
|
||||
return da;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_kmalloc);
|
||||
|
||||
/**
|
||||
* iommu_kfree - release virtual mapping obtained by 'iommu_kmalloc()'
|
||||
* @obj: objective iommu
|
||||
* @da: iommu device virtual address
|
||||
*
|
||||
* Frees the iommu virtually contiguous memory area starting at
|
||||
* @da, which was passed to and was returned by'iommu_kmalloc()'.
|
||||
*/
|
||||
void iommu_kfree(struct iommu *obj, u32 da)
|
||||
{
|
||||
struct sg_table *sgt;
|
||||
|
||||
sgt = unmap_vm_area(obj, da, kfree, IOVMF_LINEAR | IOVMF_ALLOC);
|
||||
if (!sgt)
|
||||
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
|
||||
sgtable_free(sgt);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iommu_kfree);
|
||||
|
||||
|
||||
static int __init iovmm_init(void)
|
||||
{
|
||||
const unsigned long flags = SLAB_HWCACHE_ALIGN;
|
||||
struct kmem_cache *p;
|
||||
|
||||
p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0,
|
||||
flags, NULL);
|
||||
if (!p)
|
||||
return -ENOMEM;
|
||||
iovm_area_cachep = p;
|
||||
|
||||
return 0;
|
||||
}
|
||||
module_init(iovmm_init);
|
||||
|
||||
static void __exit iovmm_exit(void)
|
||||
{
|
||||
kmem_cache_destroy(iovm_area_cachep);
|
||||
}
|
||||
module_exit(iovmm_exit);
|
||||
|
||||
MODULE_DESCRIPTION("omap iommu: simple virtual address space management");
|
||||
MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue