forked from mirrors/linux
iommu/ipmmu-vmsa: Add new IOMMU_DOMAIN_DMA ops
Introduce an alternative set of iommu_ops suitable for 64-bit ARM as well as 32-bit ARM when CONFIG_IOMMU_DMA=y. Also adjust the Kconfig to depend on ARM or IOMMU_DMA. Initialize the device from ->xlate() when CONFIG_IOMMU_DMA=y. Signed-off-by: Magnus Damm <damm+renesas@opensource.se> Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Magnus Damm
Joerg Roedel
parent
8e73bf6591
commit
3ae4729202
2 changed files with 156 additions and 9 deletions
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@ -274,6 +274,7 @@ config EXYNOS_IOMMU_DEBUG
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config IPMMU_VMSA
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bool "Renesas VMSA-compatible IPMMU"
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depends on ARM || IOMMU_DMA
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depends on ARM_LPAE
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depends on ARCH_RENESAS || COMPILE_TEST
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select IOMMU_API
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@ -10,6 +10,7 @@
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#include <linux/bitmap.h>
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#include <linux/delay.h>
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#include <linux/dma-iommu.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/export.h>
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@ -22,8 +23,10 @@
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
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#include <asm/dma-iommu.h>
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#include <asm/pgalloc.h>
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#endif
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#include "io-pgtable.h"
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@ -57,6 +60,8 @@ struct ipmmu_vmsa_archdata {
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struct ipmmu_vmsa_device *mmu;
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unsigned int *utlbs;
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unsigned int num_utlbs;
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struct device *dev;
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struct list_head list;
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};
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static DEFINE_SPINLOCK(ipmmu_devices_lock);
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@ -522,14 +527,6 @@ static struct iommu_domain *__ipmmu_domain_alloc(unsigned type)
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return &domain->io_domain;
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}
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static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
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{
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if (type != IOMMU_DOMAIN_UNMANAGED)
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return NULL;
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return __ipmmu_domain_alloc(type);
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}
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static void ipmmu_domain_free(struct iommu_domain *io_domain)
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{
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struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
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@ -572,7 +569,8 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
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dev_err(dev, "Can't attach IPMMU %s to domain on IPMMU %s\n",
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dev_name(mmu->dev), dev_name(domain->mmu->dev));
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ret = -EINVAL;
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}
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} else
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dev_info(dev, "Reusing IPMMU context %u\n", domain->context_id);
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spin_unlock_irqrestore(&domain->lock, flags);
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@ -708,6 +706,7 @@ static int ipmmu_init_platform_device(struct device *dev)
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archdata->mmu = mmu;
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archdata->utlbs = utlbs;
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archdata->num_utlbs = num_utlbs;
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archdata->dev = dev;
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dev->archdata.iommu = archdata;
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return 0;
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@ -716,6 +715,16 @@ static int ipmmu_init_platform_device(struct device *dev)
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return ret;
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}
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#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
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static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
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{
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if (type != IOMMU_DOMAIN_UNMANAGED)
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return NULL;
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return __ipmmu_domain_alloc(type);
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}
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static int ipmmu_add_device(struct device *dev)
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{
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struct ipmmu_vmsa_archdata *archdata;
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@ -825,6 +834,141 @@ static const struct iommu_ops ipmmu_ops = {
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.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
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};
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#endif /* !CONFIG_ARM && CONFIG_IOMMU_DMA */
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#ifdef CONFIG_IOMMU_DMA
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static DEFINE_SPINLOCK(ipmmu_slave_devices_lock);
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static LIST_HEAD(ipmmu_slave_devices);
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static struct iommu_domain *ipmmu_domain_alloc_dma(unsigned type)
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{
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struct iommu_domain *io_domain = NULL;
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switch (type) {
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case IOMMU_DOMAIN_UNMANAGED:
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io_domain = __ipmmu_domain_alloc(type);
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break;
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case IOMMU_DOMAIN_DMA:
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io_domain = __ipmmu_domain_alloc(type);
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if (io_domain)
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iommu_get_dma_cookie(io_domain);
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break;
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}
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return io_domain;
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}
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static void ipmmu_domain_free_dma(struct iommu_domain *io_domain)
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{
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switch (io_domain->type) {
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case IOMMU_DOMAIN_DMA:
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iommu_put_dma_cookie(io_domain);
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/* fall-through */
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default:
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ipmmu_domain_free(io_domain);
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break;
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}
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}
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static int ipmmu_add_device_dma(struct device *dev)
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{
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struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
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struct iommu_group *group;
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/* The device has been verified in xlate() */
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if (!archdata)
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return -ENODEV;
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group = iommu_group_get_for_dev(dev);
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if (IS_ERR(group))
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return PTR_ERR(group);
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spin_lock(&ipmmu_slave_devices_lock);
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list_add(&archdata->list, &ipmmu_slave_devices);
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spin_unlock(&ipmmu_slave_devices_lock);
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return 0;
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}
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static void ipmmu_remove_device_dma(struct device *dev)
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{
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struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
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spin_lock(&ipmmu_slave_devices_lock);
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list_del(&archdata->list);
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spin_unlock(&ipmmu_slave_devices_lock);
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iommu_group_remove_device(dev);
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}
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static struct device *ipmmu_find_sibling_device(struct device *dev)
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{
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struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
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struct ipmmu_vmsa_archdata *sibling_archdata = NULL;
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bool found = false;
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spin_lock(&ipmmu_slave_devices_lock);
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list_for_each_entry(sibling_archdata, &ipmmu_slave_devices, list) {
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if (archdata == sibling_archdata)
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continue;
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if (sibling_archdata->mmu == archdata->mmu) {
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found = true;
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break;
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}
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}
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spin_unlock(&ipmmu_slave_devices_lock);
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return found ? sibling_archdata->dev : NULL;
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}
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static struct iommu_group *ipmmu_find_group_dma(struct device *dev)
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{
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struct iommu_group *group;
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struct device *sibling;
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sibling = ipmmu_find_sibling_device(dev);
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if (sibling)
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group = iommu_group_get(sibling);
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if (!sibling || IS_ERR(group))
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group = generic_device_group(dev);
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return group;
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}
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static int ipmmu_of_xlate_dma(struct device *dev,
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struct of_phandle_args *spec)
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{
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/* If the IPMMU device is disabled in DT then return error
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* to make sure the of_iommu code does not install ops
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* even though the iommu device is disabled
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*/
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if (!of_device_is_available(spec->np))
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return -ENODEV;
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return ipmmu_init_platform_device(dev);
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}
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static const struct iommu_ops ipmmu_ops = {
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.domain_alloc = ipmmu_domain_alloc_dma,
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.domain_free = ipmmu_domain_free_dma,
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.attach_dev = ipmmu_attach_device,
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.detach_dev = ipmmu_detach_device,
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.map = ipmmu_map,
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.unmap = ipmmu_unmap,
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.map_sg = default_iommu_map_sg,
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.iova_to_phys = ipmmu_iova_to_phys,
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.add_device = ipmmu_add_device_dma,
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.remove_device = ipmmu_remove_device_dma,
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.device_group = ipmmu_find_group_dma,
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.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
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.of_xlate = ipmmu_of_xlate_dma,
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};
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#endif /* CONFIG_IOMMU_DMA */
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/* -----------------------------------------------------------------------------
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* Probe/remove and init
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*/
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@ -914,7 +1058,9 @@ static int ipmmu_remove(struct platform_device *pdev)
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list_del(&mmu->list);
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spin_unlock(&ipmmu_devices_lock);
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#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
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arm_iommu_release_mapping(mmu->mapping);
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#endif
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ipmmu_device_reset(mmu);
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