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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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+
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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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+
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+#include <asm/cacheflush.h>
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+#include <asm/mach/map.h>
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+
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+#include <mach/iommu.h>
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+#include <mach/iovmm.h>
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+
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+#include "iopgtable.h"
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+
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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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+
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+static struct kmem_cache *iovm_area_cachep;
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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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+
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+ if (!sgt)
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+ return 0;
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+
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+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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+ size_t bytes;
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+
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+ bytes = sg_dma_len(sg);
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+
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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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+
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+ total += bytes;
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+ }
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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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+/*
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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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+
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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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+
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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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+
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+ return nr_entries;
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+}
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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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+
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+ if (!bytes)
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+ return ERR_PTR(-EINVAL);
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+
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+ if (!IS_ALIGNED(bytes, PAGE_SIZE))
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+ return ERR_PTR(-EINVAL);
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+
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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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+
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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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+
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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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+
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+ pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries);
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+
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+ return sgt;
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+}
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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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+
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+ sg_free_table(sgt);
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+ kfree(sgt);
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+
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+ pr_debug("%s: sgt:%p\n", __func__, sgt);
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+ pa = sg_phys(sg);
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+ bytes = sg_dma_len(sg);
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+
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+ BUG_ON(bytes != PAGE_SIZE);
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+
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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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+
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+ va += bytes;
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+ }
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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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+
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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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+
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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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+
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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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+
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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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+
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+ len = tmp->da_end - tmp->da_start;
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+
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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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+
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+ return tmp;
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+ }
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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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+/**
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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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+
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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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+
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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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+/*
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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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+
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+ if (!obj || !bytes)
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+ return ERR_PTR(-EINVAL);
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+
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+ start = da;
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+ alignement = PAGE_SIZE;
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+
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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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+
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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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+
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+ prev_end = 0;
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+ list_for_each_entry(tmp, &obj->mmap, list) {
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+
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+ if ((prev_end <= start) && (start + bytes < tmp->da_start))
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+ goto found;
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+
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+ if (flags & IOVMF_DA_ANON)
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+ start = roundup(tmp->da_end, alignement);
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+
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+ prev_end = tmp->da_end;
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+ }
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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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+
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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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+
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+ return ERR_PTR(-EINVAL);
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+
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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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+
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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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+ /*
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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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+
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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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+
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+ return new;
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+}
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+
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+static void free_iovm_area(struct iommu *obj, struct iovm_struct *area)
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+{
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+ size_t bytes;
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+
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+ BUG_ON(!obj || !area);
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+
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+ bytes = area->da_end - area->da_start;
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+
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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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+
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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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+/**
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+ * da_to_va - convert (d) to (v)
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+ * @obj: objective iommu
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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 *da_to_va(struct iommu *obj, u32 da)
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+{
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+ void *va = NULL;
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+ struct iovm_struct *area;
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+
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+ mutex_lock(&obj->mmap_lock);
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+
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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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+ mutex_unlock(&obj->mmap_lock);
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+out:
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+ return va;
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+}
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+EXPORT_SYMBOL_GPL(da_to_va);
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+
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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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+
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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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+ /*
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+ * iommu 'superpage' isn't supported with '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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+
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+ va += bytes;
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+ }
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+
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+ va_end = _va + PAGE_SIZE * i;
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+ flush_cache_vmap(_va, va_end);
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+}
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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 readibility.
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+ */
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+ BUG_ON(!sgt);
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+}
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+
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+static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len)
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+{
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+ unsigned int i;
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+ struct scatterlist *sg;
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+ void *va;
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+
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+ va = phys_to_virt(pa);
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+
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+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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+ size_t bytes;
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+
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+ bytes = iopgsz_max(len);
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+
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+ BUG_ON(!iopgsz_ok(bytes));
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+
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+ sg_set_buf(sg, phys_to_virt(pa), bytes);
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+ /*
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+ * 'pa' is cotinuous(linear).
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+ */
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+ pa += bytes;
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+ len -= bytes;
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+ }
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+ BUG_ON(len);
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+
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+ clean_dcache_area(va, len);
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+}
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+
|
|
|
+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");
|
Russell King