396 lines
10 KiB
C
396 lines
10 KiB
C
/*
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* IOMMU for IPMMU/IPMMUI
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* Copyright (C) 2012 Hideki EIRAKU
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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 as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/iommu.h>
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#include <linux/platform_device.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <asm/dma-iommu.h>
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#include "shmobile-ipmmu.h"
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#define L1_SIZE CONFIG_SHMOBILE_IOMMU_L1SIZE
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#define L1_LEN (L1_SIZE / 4)
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#define L1_ALIGN L1_SIZE
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#define L2_SIZE SZ_1K
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#define L2_LEN (L2_SIZE / 4)
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#define L2_ALIGN L2_SIZE
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struct shmobile_iommu_domain_pgtable {
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uint32_t *pgtable;
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dma_addr_t handle;
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};
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struct shmobile_iommu_archdata {
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struct list_head attached_list;
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struct dma_iommu_mapping *iommu_mapping;
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spinlock_t attach_lock;
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struct shmobile_iommu_domain *attached;
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int num_attached_devices;
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struct shmobile_ipmmu *ipmmu;
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};
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struct shmobile_iommu_domain {
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struct shmobile_iommu_domain_pgtable l1, l2[L1_LEN];
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spinlock_t map_lock;
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spinlock_t attached_list_lock;
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struct list_head attached_list;
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};
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static struct shmobile_iommu_archdata *ipmmu_archdata;
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static struct kmem_cache *l1cache, *l2cache;
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static int pgtable_alloc(struct shmobile_iommu_domain_pgtable *pgtable,
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struct kmem_cache *cache, size_t size)
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{
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pgtable->pgtable = kmem_cache_zalloc(cache, GFP_ATOMIC);
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if (!pgtable->pgtable)
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return -ENOMEM;
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pgtable->handle = dma_map_single(NULL, pgtable->pgtable, size,
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DMA_TO_DEVICE);
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return 0;
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}
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static void pgtable_free(struct shmobile_iommu_domain_pgtable *pgtable,
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struct kmem_cache *cache, size_t size)
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{
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dma_unmap_single(NULL, pgtable->handle, size, DMA_TO_DEVICE);
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kmem_cache_free(cache, pgtable->pgtable);
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}
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static uint32_t pgtable_read(struct shmobile_iommu_domain_pgtable *pgtable,
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unsigned int index)
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{
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return pgtable->pgtable[index];
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}
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static void pgtable_write(struct shmobile_iommu_domain_pgtable *pgtable,
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unsigned int index, unsigned int count, uint32_t val)
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{
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unsigned int i;
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for (i = 0; i < count; i++)
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pgtable->pgtable[index + i] = val;
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dma_sync_single_for_device(NULL, pgtable->handle + index * sizeof(val),
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sizeof(val) * count, DMA_TO_DEVICE);
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}
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static int shmobile_iommu_domain_init(struct iommu_domain *domain)
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{
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struct shmobile_iommu_domain *sh_domain;
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int i, ret;
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sh_domain = kmalloc(sizeof(*sh_domain), GFP_KERNEL);
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if (!sh_domain)
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return -ENOMEM;
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ret = pgtable_alloc(&sh_domain->l1, l1cache, L1_SIZE);
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if (ret < 0) {
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kfree(sh_domain);
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return ret;
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}
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for (i = 0; i < L1_LEN; i++)
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sh_domain->l2[i].pgtable = NULL;
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spin_lock_init(&sh_domain->map_lock);
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spin_lock_init(&sh_domain->attached_list_lock);
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INIT_LIST_HEAD(&sh_domain->attached_list);
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domain->priv = sh_domain;
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return 0;
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}
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static void shmobile_iommu_domain_destroy(struct iommu_domain *domain)
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{
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struct shmobile_iommu_domain *sh_domain = domain->priv;
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int i;
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for (i = 0; i < L1_LEN; i++) {
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if (sh_domain->l2[i].pgtable)
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pgtable_free(&sh_domain->l2[i], l2cache, L2_SIZE);
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}
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pgtable_free(&sh_domain->l1, l1cache, L1_SIZE);
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kfree(sh_domain);
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domain->priv = NULL;
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}
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static int shmobile_iommu_attach_device(struct iommu_domain *domain,
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struct device *dev)
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{
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struct shmobile_iommu_archdata *archdata = dev->archdata.iommu;
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struct shmobile_iommu_domain *sh_domain = domain->priv;
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int ret = -EBUSY;
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if (!archdata)
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return -ENODEV;
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spin_lock(&sh_domain->attached_list_lock);
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spin_lock(&archdata->attach_lock);
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if (archdata->attached != sh_domain) {
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if (archdata->attached)
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goto err;
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ipmmu_tlb_set(archdata->ipmmu, sh_domain->l1.handle, L1_SIZE,
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0);
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ipmmu_tlb_flush(archdata->ipmmu);
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archdata->attached = sh_domain;
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archdata->num_attached_devices = 0;
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list_add(&archdata->attached_list, &sh_domain->attached_list);
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}
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archdata->num_attached_devices++;
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ret = 0;
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err:
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spin_unlock(&archdata->attach_lock);
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spin_unlock(&sh_domain->attached_list_lock);
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return ret;
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}
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static void shmobile_iommu_detach_device(struct iommu_domain *domain,
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struct device *dev)
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{
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struct shmobile_iommu_archdata *archdata = dev->archdata.iommu;
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struct shmobile_iommu_domain *sh_domain = domain->priv;
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if (!archdata)
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return;
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spin_lock(&sh_domain->attached_list_lock);
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spin_lock(&archdata->attach_lock);
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archdata->num_attached_devices--;
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if (!archdata->num_attached_devices) {
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ipmmu_tlb_set(archdata->ipmmu, 0, 0, 0);
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ipmmu_tlb_flush(archdata->ipmmu);
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archdata->attached = NULL;
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list_del(&archdata->attached_list);
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}
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spin_unlock(&archdata->attach_lock);
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spin_unlock(&sh_domain->attached_list_lock);
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}
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static void domain_tlb_flush(struct shmobile_iommu_domain *sh_domain)
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{
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struct shmobile_iommu_archdata *archdata;
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spin_lock(&sh_domain->attached_list_lock);
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list_for_each_entry(archdata, &sh_domain->attached_list, attached_list)
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ipmmu_tlb_flush(archdata->ipmmu);
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spin_unlock(&sh_domain->attached_list_lock);
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}
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static int l2alloc(struct shmobile_iommu_domain *sh_domain,
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unsigned int l1index)
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{
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int ret;
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if (!sh_domain->l2[l1index].pgtable) {
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ret = pgtable_alloc(&sh_domain->l2[l1index], l2cache, L2_SIZE);
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if (ret < 0)
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return ret;
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}
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pgtable_write(&sh_domain->l1, l1index, 1,
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sh_domain->l2[l1index].handle | 0x1);
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return 0;
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}
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static void l2realfree(struct shmobile_iommu_domain_pgtable *l2)
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{
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if (l2->pgtable)
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pgtable_free(l2, l2cache, L2_SIZE);
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}
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static void l2free(struct shmobile_iommu_domain *sh_domain,
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unsigned int l1index,
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struct shmobile_iommu_domain_pgtable *l2)
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{
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pgtable_write(&sh_domain->l1, l1index, 1, 0);
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if (sh_domain->l2[l1index].pgtable) {
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*l2 = sh_domain->l2[l1index];
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sh_domain->l2[l1index].pgtable = NULL;
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}
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}
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static int shmobile_iommu_map(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, size_t size, int prot)
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{
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struct shmobile_iommu_domain_pgtable l2 = { .pgtable = NULL };
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struct shmobile_iommu_domain *sh_domain = domain->priv;
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unsigned int l1index, l2index;
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int ret;
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l1index = iova >> 20;
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switch (size) {
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case SZ_4K:
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l2index = (iova >> 12) & 0xff;
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spin_lock(&sh_domain->map_lock);
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ret = l2alloc(sh_domain, l1index);
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if (!ret)
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pgtable_write(&sh_domain->l2[l1index], l2index, 1,
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paddr | 0xff2);
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spin_unlock(&sh_domain->map_lock);
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break;
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case SZ_64K:
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l2index = (iova >> 12) & 0xf0;
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spin_lock(&sh_domain->map_lock);
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ret = l2alloc(sh_domain, l1index);
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if (!ret)
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pgtable_write(&sh_domain->l2[l1index], l2index, 0x10,
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paddr | 0xff1);
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spin_unlock(&sh_domain->map_lock);
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break;
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case SZ_1M:
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spin_lock(&sh_domain->map_lock);
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l2free(sh_domain, l1index, &l2);
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pgtable_write(&sh_domain->l1, l1index, 1, paddr | 0xc02);
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spin_unlock(&sh_domain->map_lock);
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ret = 0;
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break;
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default:
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ret = -EINVAL;
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}
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if (!ret)
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domain_tlb_flush(sh_domain);
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l2realfree(&l2);
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return ret;
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}
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static size_t shmobile_iommu_unmap(struct iommu_domain *domain,
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unsigned long iova, size_t size)
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{
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struct shmobile_iommu_domain_pgtable l2 = { .pgtable = NULL };
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struct shmobile_iommu_domain *sh_domain = domain->priv;
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unsigned int l1index, l2index;
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uint32_t l2entry = 0;
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size_t ret = 0;
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l1index = iova >> 20;
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if (!(iova & 0xfffff) && size >= SZ_1M) {
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spin_lock(&sh_domain->map_lock);
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l2free(sh_domain, l1index, &l2);
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spin_unlock(&sh_domain->map_lock);
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ret = SZ_1M;
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goto done;
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}
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l2index = (iova >> 12) & 0xff;
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spin_lock(&sh_domain->map_lock);
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if (sh_domain->l2[l1index].pgtable)
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l2entry = pgtable_read(&sh_domain->l2[l1index], l2index);
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switch (l2entry & 3) {
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case 1:
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if (l2index & 0xf)
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break;
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pgtable_write(&sh_domain->l2[l1index], l2index, 0x10, 0);
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ret = SZ_64K;
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break;
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case 2:
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pgtable_write(&sh_domain->l2[l1index], l2index, 1, 0);
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ret = SZ_4K;
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break;
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}
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spin_unlock(&sh_domain->map_lock);
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done:
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if (ret)
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domain_tlb_flush(sh_domain);
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l2realfree(&l2);
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return ret;
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}
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static phys_addr_t shmobile_iommu_iova_to_phys(struct iommu_domain *domain,
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dma_addr_t iova)
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{
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struct shmobile_iommu_domain *sh_domain = domain->priv;
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uint32_t l1entry = 0, l2entry = 0;
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unsigned int l1index, l2index;
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l1index = iova >> 20;
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l2index = (iova >> 12) & 0xff;
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spin_lock(&sh_domain->map_lock);
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if (sh_domain->l2[l1index].pgtable)
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l2entry = pgtable_read(&sh_domain->l2[l1index], l2index);
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else
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l1entry = pgtable_read(&sh_domain->l1, l1index);
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spin_unlock(&sh_domain->map_lock);
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switch (l2entry & 3) {
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case 1:
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return (l2entry & ~0xffff) | (iova & 0xffff);
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case 2:
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return (l2entry & ~0xfff) | (iova & 0xfff);
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default:
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if ((l1entry & 3) == 2)
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return (l1entry & ~0xfffff) | (iova & 0xfffff);
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return 0;
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}
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}
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static int find_dev_name(struct shmobile_ipmmu *ipmmu, const char *dev_name)
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{
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unsigned int i, n = ipmmu->num_dev_names;
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for (i = 0; i < n; i++) {
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if (strcmp(ipmmu->dev_names[i], dev_name) == 0)
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return 1;
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}
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return 0;
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}
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static int shmobile_iommu_add_device(struct device *dev)
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{
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struct shmobile_iommu_archdata *archdata = ipmmu_archdata;
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struct dma_iommu_mapping *mapping;
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if (!find_dev_name(archdata->ipmmu, dev_name(dev)))
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return 0;
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mapping = archdata->iommu_mapping;
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if (!mapping) {
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mapping = arm_iommu_create_mapping(&platform_bus_type, 0,
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L1_LEN << 20);
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if (IS_ERR(mapping))
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return PTR_ERR(mapping);
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archdata->iommu_mapping = mapping;
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}
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dev->archdata.iommu = archdata;
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if (arm_iommu_attach_device(dev, mapping))
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pr_err("arm_iommu_attach_device failed\n");
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return 0;
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}
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static const struct iommu_ops shmobile_iommu_ops = {
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.domain_init = shmobile_iommu_domain_init,
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.domain_destroy = shmobile_iommu_domain_destroy,
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.attach_dev = shmobile_iommu_attach_device,
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.detach_dev = shmobile_iommu_detach_device,
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.map = shmobile_iommu_map,
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.unmap = shmobile_iommu_unmap,
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.map_sg = default_iommu_map_sg,
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.iova_to_phys = shmobile_iommu_iova_to_phys,
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.add_device = shmobile_iommu_add_device,
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.pgsize_bitmap = SZ_1M | SZ_64K | SZ_4K,
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};
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int ipmmu_iommu_init(struct shmobile_ipmmu *ipmmu)
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{
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static struct shmobile_iommu_archdata *archdata;
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l1cache = kmem_cache_create("shmobile-iommu-pgtable1", L1_SIZE,
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L1_ALIGN, SLAB_HWCACHE_ALIGN, NULL);
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if (!l1cache)
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return -ENOMEM;
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l2cache = kmem_cache_create("shmobile-iommu-pgtable2", L2_SIZE,
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L2_ALIGN, SLAB_HWCACHE_ALIGN, NULL);
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if (!l2cache) {
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kmem_cache_destroy(l1cache);
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return -ENOMEM;
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}
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archdata = kzalloc(sizeof(*archdata), GFP_KERNEL);
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if (!archdata) {
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kmem_cache_destroy(l1cache);
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kmem_cache_destroy(l2cache);
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return -ENOMEM;
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}
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spin_lock_init(&archdata->attach_lock);
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archdata->ipmmu = ipmmu;
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ipmmu_archdata = archdata;
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bus_set_iommu(&platform_bus_type, &shmobile_iommu_ops);
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return 0;
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}
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