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 2017-05-17 19:07:10 +09:00 committed by Joerg Roedel
parent 8e73bf6591
commit 3ae4729202
2 changed files with 156 additions and 9 deletions

View File

@ -274,6 +274,7 @@ config EXYNOS_IOMMU_DEBUG
config IPMMU_VMSA
bool "Renesas VMSA-compatible IPMMU"
depends on ARM || IOMMU_DMA
depends on ARM_LPAE
depends on ARCH_RENESAS || COMPILE_TEST
select IOMMU_API

View File

@ -10,6 +10,7 @@
#include <linux/bitmap.h>
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/export.h>
@ -22,8 +23,10 @@
#include <linux/sizes.h>
#include <linux/slab.h>
#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
#include <asm/dma-iommu.h>
#include <asm/pgalloc.h>
#endif
#include "io-pgtable.h"
@ -57,6 +60,8 @@ struct ipmmu_vmsa_archdata {
struct ipmmu_vmsa_device *mmu;
unsigned int *utlbs;
unsigned int num_utlbs;
struct device *dev;
struct list_head list;
};
static DEFINE_SPINLOCK(ipmmu_devices_lock);
@ -522,14 +527,6 @@ static struct iommu_domain *__ipmmu_domain_alloc(unsigned type)
return &domain->io_domain;
}
static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
{
if (type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
return __ipmmu_domain_alloc(type);
}
static void ipmmu_domain_free(struct iommu_domain *io_domain)
{
struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
@ -572,7 +569,8 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
dev_err(dev, "Can't attach IPMMU %s to domain on IPMMU %s\n",
dev_name(mmu->dev), dev_name(domain->mmu->dev));
ret = -EINVAL;
}
} else
dev_info(dev, "Reusing IPMMU context %u\n", domain->context_id);
spin_unlock_irqrestore(&domain->lock, flags);
@ -708,6 +706,7 @@ static int ipmmu_init_platform_device(struct device *dev)
archdata->mmu = mmu;
archdata->utlbs = utlbs;
archdata->num_utlbs = num_utlbs;
archdata->dev = dev;
dev->archdata.iommu = archdata;
return 0;
@ -716,6 +715,16 @@ error:
return ret;
}
#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
{
if (type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
return __ipmmu_domain_alloc(type);
}
static int ipmmu_add_device(struct device *dev)
{
struct ipmmu_vmsa_archdata *archdata;
@ -825,6 +834,141 @@ static const struct iommu_ops ipmmu_ops = {
.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
};
#endif /* !CONFIG_ARM && CONFIG_IOMMU_DMA */
#ifdef CONFIG_IOMMU_DMA
static DEFINE_SPINLOCK(ipmmu_slave_devices_lock);
static LIST_HEAD(ipmmu_slave_devices);
static struct iommu_domain *ipmmu_domain_alloc_dma(unsigned type)
{
struct iommu_domain *io_domain = NULL;
switch (type) {
case IOMMU_DOMAIN_UNMANAGED:
io_domain = __ipmmu_domain_alloc(type);
break;
case IOMMU_DOMAIN_DMA:
io_domain = __ipmmu_domain_alloc(type);
if (io_domain)
iommu_get_dma_cookie(io_domain);
break;
}
return io_domain;
}
static void ipmmu_domain_free_dma(struct iommu_domain *io_domain)
{
switch (io_domain->type) {
case IOMMU_DOMAIN_DMA:
iommu_put_dma_cookie(io_domain);
/* fall-through */
default:
ipmmu_domain_free(io_domain);
break;
}
}
static int ipmmu_add_device_dma(struct device *dev)
{
struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
struct iommu_group *group;
/* The device has been verified in xlate() */
if (!archdata)
return -ENODEV;
group = iommu_group_get_for_dev(dev);
if (IS_ERR(group))
return PTR_ERR(group);
spin_lock(&ipmmu_slave_devices_lock);
list_add(&archdata->list, &ipmmu_slave_devices);
spin_unlock(&ipmmu_slave_devices_lock);
return 0;
}
static void ipmmu_remove_device_dma(struct device *dev)
{
struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
spin_lock(&ipmmu_slave_devices_lock);
list_del(&archdata->list);
spin_unlock(&ipmmu_slave_devices_lock);
iommu_group_remove_device(dev);
}
static struct device *ipmmu_find_sibling_device(struct device *dev)
{
struct ipmmu_vmsa_archdata *archdata = dev->archdata.iommu;
struct ipmmu_vmsa_archdata *sibling_archdata = NULL;
bool found = false;
spin_lock(&ipmmu_slave_devices_lock);
list_for_each_entry(sibling_archdata, &ipmmu_slave_devices, list) {
if (archdata == sibling_archdata)
continue;
if (sibling_archdata->mmu == archdata->mmu) {
found = true;
break;
}
}
spin_unlock(&ipmmu_slave_devices_lock);
return found ? sibling_archdata->dev : NULL;
}
static struct iommu_group *ipmmu_find_group_dma(struct device *dev)
{
struct iommu_group *group;
struct device *sibling;
sibling = ipmmu_find_sibling_device(dev);
if (sibling)
group = iommu_group_get(sibling);
if (!sibling || IS_ERR(group))
group = generic_device_group(dev);
return group;
}
static int ipmmu_of_xlate_dma(struct device *dev,
struct of_phandle_args *spec)
{
/* If the IPMMU device is disabled in DT then return error
* to make sure the of_iommu code does not install ops
* even though the iommu device is disabled
*/
if (!of_device_is_available(spec->np))
return -ENODEV;
return ipmmu_init_platform_device(dev);
}
static const struct iommu_ops ipmmu_ops = {
.domain_alloc = ipmmu_domain_alloc_dma,
.domain_free = ipmmu_domain_free_dma,
.attach_dev = ipmmu_attach_device,
.detach_dev = ipmmu_detach_device,
.map = ipmmu_map,
.unmap = ipmmu_unmap,
.map_sg = default_iommu_map_sg,
.iova_to_phys = ipmmu_iova_to_phys,
.add_device = ipmmu_add_device_dma,
.remove_device = ipmmu_remove_device_dma,
.device_group = ipmmu_find_group_dma,
.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
.of_xlate = ipmmu_of_xlate_dma,
};
#endif /* CONFIG_IOMMU_DMA */
/* -----------------------------------------------------------------------------
* Probe/remove and init
*/
@ -914,7 +1058,9 @@ static int ipmmu_remove(struct platform_device *pdev)
list_del(&mmu->list);
spin_unlock(&ipmmu_devices_lock);
#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
arm_iommu_release_mapping(mmu->mapping);
#endif
ipmmu_device_reset(mmu);