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![Suman Anna](/assets/img/avatar_default.png)
This patch fixes the checkpatch warnings in omap iommu code, most of them are related to broken strings. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
791 lines
17 KiB
C
791 lines
17 KiB
C
/*
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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/module.h>
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#include <linux/err.h>
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#include <linux/slab.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 <linux/iommu.h>
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#include <linux/omap-iommu.h>
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#include <linux/platform_data/iommu-omap.h>
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#include <asm/cacheflush.h>
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#include <asm/mach/map.h>
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#include "omap-iopgtable.h"
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#include "omap-iommu.h"
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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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/*
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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_ELSZ_MASK (3 << 7)
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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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static struct kmem_cache *iovm_area_cachep;
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/* return the offset of the first scatterlist entry in a sg table */
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static unsigned int sgtable_offset(const struct sg_table *sgt)
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{
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if (!sgt || !sgt->nents)
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return 0;
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return sgt->sgl->offset;
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}
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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->length + sg->offset;
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if (!iopgsz_ok(bytes)) {
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pr_err("%s: sg[%d] not iommu pagesize(%u %u)\n",
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__func__, i, bytes, sg->offset);
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return 0;
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}
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if (i && sg->offset) {
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pr_err("%s: sg[%d] offset not allowed in internal entries\n",
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__func__, i);
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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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static unsigned max_alignment(u32 addr)
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{
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int i;
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unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, };
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for (i = 0; i < ARRAY_SIZE(pagesize) && addr & (pagesize[i] - 1); i++)
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;
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return (i < ARRAY_SIZE(pagesize)) ? pagesize[i] : 0;
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}
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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 sgtable_nents(size_t bytes, u32 da, u32 pa)
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{
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unsigned nr_entries = 0, ent_sz;
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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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while (bytes) {
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ent_sz = max_alignment(da | pa);
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ent_sz = min_t(unsigned, ent_sz, iopgsz_max(bytes));
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nr_entries++;
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da += ent_sz;
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pa += ent_sz;
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bytes -= ent_sz;
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}
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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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u32 da, u32 pa)
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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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if (flags & IOVMF_LINEAR) {
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nr_entries = sgtable_nents(bytes, da, pa);
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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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kfree(sgt);
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return ERR_PTR(err);
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}
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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) - sg->offset;
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bytes = sg->length + sg->offset;
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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((unsigned long)new->addr,
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(unsigned long)(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 omap_iommu *obj,
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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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* omap_find_iovm_area - find iovma which includes @da
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* @dev: client device
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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 *omap_find_iovm_area(struct device *dev, u32 da)
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{
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struct omap_iommu *obj = dev_to_omap_iommu(dev);
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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(omap_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 omap_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, alignment;
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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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alignment = PAGE_SIZE;
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if (~flags & IOVMF_DA_FIXED) {
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/* Don't map address 0 */
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start = obj->da_start ? obj->da_start : alignment;
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if (flags & IOVMF_LINEAR)
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alignment = iopgsz_max(bytes);
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start = roundup(start, alignment);
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} else if (start < obj->da_start || start > obj->da_end ||
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obj->da_end - start < bytes) {
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return ERR_PTR(-EINVAL);
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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)
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break;
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if (tmp->da_start > start && (tmp->da_start - start) >= bytes)
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goto found;
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if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED)
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start = roundup(tmp->da_end + 1, alignment);
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prev_end = tmp->da_end;
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}
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if ((start >= prev_end) && (obj->da_end - 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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*/
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if (tmp)
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list_add_tail(&new->list, &tmp->list);
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else
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list_add(&new->list, &obj->mmap);
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dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n",
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__func__, new->da_start, start, new->da_end, bytes, flags);
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return new;
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}
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static void free_iovm_area(struct omap_iommu *obj, struct iovm_struct *area)
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{
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size_t bytes;
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BUG_ON(!obj || !area);
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bytes = area->da_end - area->da_start;
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dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n",
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__func__, area->da_start, area->da_end, bytes, area->flags);
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list_del(&area->list);
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kmem_cache_free(iovm_area_cachep, area);
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}
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/**
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* omap_da_to_va - convert (d) to (v)
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* @dev: client device
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* @da: iommu device virtual address
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* @va: mpu virtual address
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*
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* Returns mpu virtual addr which corresponds to a given device virtual addr
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*/
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void *omap_da_to_va(struct device *dev, u32 da)
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{
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struct omap_iommu *obj = dev_to_omap_iommu(dev);
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void *va = NULL;
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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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if (!area) {
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dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da);
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goto out;
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}
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va = area->va;
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out:
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mutex_unlock(&obj->mmap_lock);
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return va;
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}
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EXPORT_SYMBOL_GPL(omap_da_to_va);
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static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va)
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{
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unsigned int i;
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struct scatterlist *sg;
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void *va = _va;
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void *va_end;
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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struct page *pg;
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const size_t bytes = PAGE_SIZE;
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/*
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* iommu 'superpage' isn't supported with 'omap_iommu_vmalloc()'
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*/
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pg = vmalloc_to_page(va);
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BUG_ON(!pg);
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sg_set_page(sg, pg, bytes, 0);
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va += bytes;
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}
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va_end = _va + PAGE_SIZE * i;
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}
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static inline void sgtable_drain_vmalloc(struct sg_table *sgt)
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{
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/*
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* Actually this is not necessary at all, just exists for
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* consistency of the code readability.
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*/
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BUG_ON(!sgt);
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}
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/* create 'da' <-> 'pa' mapping from 'sgt' */
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static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new,
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const struct sg_table *sgt, u32 flags)
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{
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int err;
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unsigned int i, j;
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struct scatterlist *sg;
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u32 da = new->da_start;
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if (!domain || !sgt)
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return -EINVAL;
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BUG_ON(!sgtable_ok(sgt));
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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u32 pa;
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size_t bytes;
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pa = sg_phys(sg) - sg->offset;
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bytes = sg->length + sg->offset;
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flags &= ~IOVMF_PGSZ_MASK;
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if (bytes_to_iopgsz(bytes) < 0)
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goto err_out;
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pr_debug("%s: [%d] %08x %08x(%x)\n", __func__,
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i, da, pa, bytes);
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err = iommu_map(domain, da, pa, bytes, flags);
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if (err)
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goto err_out;
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da += bytes;
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}
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return 0;
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err_out:
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da = new->da_start;
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for_each_sg(sgt->sgl, sg, i, j) {
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size_t bytes;
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bytes = sg->length + sg->offset;
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/* ignore failures.. we're already handling one */
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iommu_unmap(domain, da, bytes);
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da += bytes;
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}
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return err;
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}
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/* release 'da' <-> 'pa' mapping */
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static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj,
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struct iovm_struct *area)
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{
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u32 start;
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size_t total = area->da_end - area->da_start;
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const struct sg_table *sgt = area->sgt;
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struct scatterlist *sg;
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int i;
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size_t unmapped;
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BUG_ON(!sgtable_ok(sgt));
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BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE));
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start = area->da_start;
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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->length + sg->offset;
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unmapped = iommu_unmap(domain, start, bytes);
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if (unmapped < bytes)
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break;
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dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n",
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__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_domain *domain,
|
|
struct omap_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(domain, 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_domain *domain, struct omap_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(domain, 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_domain *domain, struct omap_iommu *obj,
|
|
u32 da, const struct sg_table *sgt,
|
|
void *va, size_t bytes, u32 flags)
|
|
{
|
|
return map_iommu_region(domain, obj, da, sgt, va, bytes, flags);
|
|
}
|
|
|
|
/**
|
|
* omap_iommu_vmap - (d)-(p)-(v) address mapper
|
|
* @domain: iommu domain
|
|
* @dev: client device
|
|
* @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 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
|
|
const struct sg_table *sgt, u32 flags)
|
|
{
|
|
struct omap_iommu *obj = dev_to_omap_iommu(dev);
|
|
size_t bytes;
|
|
void *va = NULL;
|
|
|
|
if (!obj || !obj->dev || !sgt)
|
|
return -EINVAL;
|
|
|
|
bytes = sgtable_len(sgt);
|
|
if (!bytes)
|
|
return -EINVAL;
|
|
bytes = PAGE_ALIGN(bytes);
|
|
|
|
if (flags & IOVMF_MMIO) {
|
|
va = vmap_sg(sgt);
|
|
if (IS_ERR(va))
|
|
return PTR_ERR(va);
|
|
}
|
|
|
|
flags |= IOVMF_DISCONT;
|
|
flags |= IOVMF_MMIO;
|
|
|
|
da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags);
|
|
if (IS_ERR_VALUE(da))
|
|
vunmap_sg(va);
|
|
|
|
return da + sgtable_offset(sgt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(omap_iommu_vmap);
|
|
|
|
/**
|
|
* omap_iommu_vunmap - release virtual mapping obtained by 'omap_iommu_vmap()'
|
|
* @domain: iommu domain
|
|
* @dev: client device
|
|
* @da: iommu device virtual address
|
|
*
|
|
* Free the iommu virtually contiguous memory area starting at
|
|
* @da, which was returned by 'omap_iommu_vmap()'.
|
|
*/
|
|
struct sg_table *
|
|
omap_iommu_vunmap(struct iommu_domain *domain, struct device *dev, u32 da)
|
|
{
|
|
struct omap_iommu *obj = dev_to_omap_iommu(dev);
|
|
struct sg_table *sgt;
|
|
/*
|
|
* 'sgt' is allocated before 'omap_iommu_vmalloc()' is called.
|
|
* Just returns 'sgt' to the caller to free
|
|
*/
|
|
da &= PAGE_MASK;
|
|
sgt = unmap_vm_area(domain, obj, da, vunmap_sg,
|
|
IOVMF_DISCONT | IOVMF_MMIO);
|
|
if (!sgt)
|
|
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
|
|
return sgt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(omap_iommu_vunmap);
|
|
|
|
/**
|
|
* omap_iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
|
|
* @dev: client device
|
|
* @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_FIXED' is not set.
|
|
*/
|
|
u32
|
|
omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev, u32 da,
|
|
size_t bytes, u32 flags)
|
|
{
|
|
struct omap_iommu *obj = dev_to_omap_iommu(dev);
|
|
void *va;
|
|
struct sg_table *sgt;
|
|
|
|
if (!obj || !obj->dev || !bytes)
|
|
return -EINVAL;
|
|
|
|
bytes = PAGE_ALIGN(bytes);
|
|
|
|
va = vmalloc(bytes);
|
|
if (!va)
|
|
return -ENOMEM;
|
|
|
|
flags |= IOVMF_DISCONT;
|
|
flags |= IOVMF_ALLOC;
|
|
|
|
sgt = sgtable_alloc(bytes, flags, da, 0);
|
|
if (IS_ERR(sgt)) {
|
|
da = PTR_ERR(sgt);
|
|
goto err_sgt_alloc;
|
|
}
|
|
sgtable_fill_vmalloc(sgt, va);
|
|
|
|
da = __iommu_vmap(domain, 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(omap_iommu_vmalloc);
|
|
|
|
/**
|
|
* omap_iommu_vfree - release memory allocated by 'omap_iommu_vmalloc()'
|
|
* @dev: client device
|
|
* @da: iommu device virtual address
|
|
*
|
|
* Frees the iommu virtually continuous memory area starting at
|
|
* @da, as obtained from 'omap_iommu_vmalloc()'.
|
|
*/
|
|
void omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
|
|
const u32 da)
|
|
{
|
|
struct omap_iommu *obj = dev_to_omap_iommu(dev);
|
|
struct sg_table *sgt;
|
|
|
|
sgt = unmap_vm_area(domain, obj, da, vfree,
|
|
IOVMF_DISCONT | IOVMF_ALLOC);
|
|
if (!sgt)
|
|
dev_dbg(obj->dev, "%s: No sgt\n", __func__);
|
|
sgtable_free(sgt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(omap_iommu_vfree);
|
|
|
|
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");
|