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-rw-r--r--drivers/iommu/amd_iommu.c196
-rw-r--r--drivers/iommu/amd_iommu_types.h1
-rw-r--r--drivers/iommu/intel-iommu.c42
-rw-r--r--drivers/iommu/omap-iommu.c68
-rw-r--r--drivers/iommu/omap-iommu.h3
-rw-r--r--drivers/iommu/omap-iommu2.c36
-rw-r--r--drivers/iommu/tegra-gart.c2
-rw-r--r--drivers/iommu/tegra-smmu.c6
8 files changed, 224 insertions, 130 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 55074cba20eb..c1c74e030a58 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -57,17 +57,9 @@
* physically contiguous memory regions it is mapping into page sizes
* that we support.
*
- * Traditionally the IOMMU core just handed us the mappings directly,
- * after making sure the size is an order of a 4KiB page and that the
- * mapping has natural alignment.
- *
- * To retain this behavior, we currently advertise that we support
- * all page sizes that are an order of 4KiB.
- *
- * If at some point we'd like to utilize the IOMMU core's new behavior,
- * we could change this to advertise the real page sizes we support.
+ * 512GB Pages are not supported due to a hardware bug
*/
-#define AMD_IOMMU_PGSIZES (~0xFFFUL)
+#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
static DEFINE_RWLOCK(amd_iommu_devtable_lock);
@@ -140,6 +132,9 @@ static void free_dev_data(struct iommu_dev_data *dev_data)
list_del(&dev_data->dev_data_list);
spin_unlock_irqrestore(&dev_data_list_lock, flags);
+ if (dev_data->group)
+ iommu_group_put(dev_data->group);
+
kfree(dev_data);
}
@@ -274,41 +269,23 @@ static void swap_pci_ref(struct pci_dev **from, struct pci_dev *to)
*from = to;
}
-#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
-
-static int iommu_init_device(struct device *dev)
+static struct pci_bus *find_hosted_bus(struct pci_bus *bus)
{
- struct pci_dev *dma_pdev = NULL, *pdev = to_pci_dev(dev);
- struct iommu_dev_data *dev_data;
- struct iommu_group *group;
- u16 alias;
- int ret;
-
- if (dev->archdata.iommu)
- return 0;
-
- dev_data = find_dev_data(get_device_id(dev));
- if (!dev_data)
- return -ENOMEM;
-
- alias = amd_iommu_alias_table[dev_data->devid];
- if (alias != dev_data->devid) {
- struct iommu_dev_data *alias_data;
+ while (!bus->self) {
+ if (!pci_is_root_bus(bus))
+ bus = bus->parent;
+ else
+ return ERR_PTR(-ENODEV);
+ }
- alias_data = find_dev_data(alias);
- if (alias_data == NULL) {
- pr_err("AMD-Vi: Warning: Unhandled device %s\n",
- dev_name(dev));
- free_dev_data(dev_data);
- return -ENOTSUPP;
- }
- dev_data->alias_data = alias_data;
+ return bus;
+}
- dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff);
- }
+#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
- if (dma_pdev == NULL)
- dma_pdev = pci_dev_get(pdev);
+static struct pci_dev *get_isolation_root(struct pci_dev *pdev)
+{
+ struct pci_dev *dma_pdev = pdev;
/* Account for quirked devices */
swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
@@ -330,14 +307,9 @@ static int iommu_init_device(struct device *dev)
* Finding the next device may require skipping virtual buses.
*/
while (!pci_is_root_bus(dma_pdev->bus)) {
- struct pci_bus *bus = dma_pdev->bus;
-
- while (!bus->self) {
- if (!pci_is_root_bus(bus))
- bus = bus->parent;
- else
- goto root_bus;
- }
+ struct pci_bus *bus = find_hosted_bus(dma_pdev->bus);
+ if (IS_ERR(bus))
+ break;
if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
break;
@@ -345,19 +317,137 @@ static int iommu_init_device(struct device *dev)
swap_pci_ref(&dma_pdev, pci_dev_get(bus->self));
}
-root_bus:
- group = iommu_group_get(&dma_pdev->dev);
- pci_dev_put(dma_pdev);
+ return dma_pdev;
+}
+
+static int use_pdev_iommu_group(struct pci_dev *pdev, struct device *dev)
+{
+ struct iommu_group *group = iommu_group_get(&pdev->dev);
+ int ret;
+
if (!group) {
group = iommu_group_alloc();
if (IS_ERR(group))
return PTR_ERR(group);
+
+ WARN_ON(&pdev->dev != dev);
}
ret = iommu_group_add_device(group, dev);
-
iommu_group_put(group);
+ return ret;
+}
+
+static int use_dev_data_iommu_group(struct iommu_dev_data *dev_data,
+ struct device *dev)
+{
+ if (!dev_data->group) {
+ struct iommu_group *group = iommu_group_alloc();
+ if (IS_ERR(group))
+ return PTR_ERR(group);
+
+ dev_data->group = group;
+ }
+
+ return iommu_group_add_device(dev_data->group, dev);
+}
+
+static int init_iommu_group(struct device *dev)
+{
+ struct iommu_dev_data *dev_data;
+ struct iommu_group *group;
+ struct pci_dev *dma_pdev;
+ int ret;
+
+ group = iommu_group_get(dev);
+ if (group) {
+ iommu_group_put(group);
+ return 0;
+ }
+
+ dev_data = find_dev_data(get_device_id(dev));
+ if (!dev_data)
+ return -ENOMEM;
+
+ if (dev_data->alias_data) {
+ u16 alias;
+ struct pci_bus *bus;
+
+ if (dev_data->alias_data->group)
+ goto use_group;
+
+ /*
+ * If the alias device exists, it's effectively just a first
+ * level quirk for finding the DMA source.
+ */
+ alias = amd_iommu_alias_table[dev_data->devid];
+ dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff);
+ if (dma_pdev) {
+ dma_pdev = get_isolation_root(dma_pdev);
+ goto use_pdev;
+ }
+
+ /*
+ * If the alias is virtual, try to find a parent device
+ * and test whether the IOMMU group is actualy rooted above
+ * the alias. Be careful to also test the parent device if
+ * we think the alias is the root of the group.
+ */
+ bus = pci_find_bus(0, alias >> 8);
+ if (!bus)
+ goto use_group;
+
+ bus = find_hosted_bus(bus);
+ if (IS_ERR(bus) || !bus->self)
+ goto use_group;
+
+ dma_pdev = get_isolation_root(pci_dev_get(bus->self));
+ if (dma_pdev != bus->self || (dma_pdev->multifunction &&
+ !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)))
+ goto use_pdev;
+
+ pci_dev_put(dma_pdev);
+ goto use_group;
+ }
+
+ dma_pdev = get_isolation_root(pci_dev_get(to_pci_dev(dev)));
+use_pdev:
+ ret = use_pdev_iommu_group(dma_pdev, dev);
+ pci_dev_put(dma_pdev);
+ return ret;
+use_group:
+ return use_dev_data_iommu_group(dev_data->alias_data, dev);
+}
+
+static int iommu_init_device(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct iommu_dev_data *dev_data;
+ u16 alias;
+ int ret;
+
+ if (dev->archdata.iommu)
+ return 0;
+
+ dev_data = find_dev_data(get_device_id(dev));
+ if (!dev_data)
+ return -ENOMEM;
+
+ alias = amd_iommu_alias_table[dev_data->devid];
+ if (alias != dev_data->devid) {
+ struct iommu_dev_data *alias_data;
+
+ alias_data = find_dev_data(alias);
+ if (alias_data == NULL) {
+ pr_err("AMD-Vi: Warning: Unhandled device %s\n",
+ dev_name(dev));
+ free_dev_data(dev_data);
+ return -ENOTSUPP;
+ }
+ dev_data->alias_data = alias_data;
+ }
+ ret = init_iommu_group(dev);
if (ret)
return ret;
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index c9aa3d079ff0..e38ab438bb34 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -426,6 +426,7 @@ struct iommu_dev_data {
struct iommu_dev_data *alias_data;/* The alias dev_data */
struct protection_domain *domain; /* Domain the device is bound to */
atomic_t bind; /* Domain attach reference count */
+ struct iommu_group *group; /* IOMMU group for virtual aliases */
u16 devid; /* PCI Device ID */
bool iommu_v2; /* Device can make use of IOMMUv2 */
bool passthrough; /* Default for device is pt_domain */
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0badfa48b32b..c2c07a4a7f21 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1827,10 +1827,17 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
if (!pte)
return -ENOMEM;
/* It is large page*/
- if (largepage_lvl > 1)
+ if (largepage_lvl > 1) {
pteval |= DMA_PTE_LARGE_PAGE;
- else
+ /* Ensure that old small page tables are removed to make room
+ for superpage, if they exist. */
+ dma_pte_clear_range(domain, iov_pfn,
+ iov_pfn + lvl_to_nr_pages(largepage_lvl) - 1);
+ dma_pte_free_pagetable(domain, iov_pfn,
+ iov_pfn + lvl_to_nr_pages(largepage_lvl) - 1);
+ } else {
pteval &= ~(uint64_t)DMA_PTE_LARGE_PAGE;
+ }
}
/* We don't need lock here, nobody else
@@ -2320,8 +2327,39 @@ static int domain_add_dev_info(struct dmar_domain *domain,
return 0;
}
+static bool device_has_rmrr(struct pci_dev *dev)
+{
+ struct dmar_rmrr_unit *rmrr;
+ int i;
+
+ for_each_rmrr_units(rmrr) {
+ for (i = 0; i < rmrr->devices_cnt; i++) {
+ /*
+ * Return TRUE if this RMRR contains the device that
+ * is passed in.
+ */
+ if (rmrr->devices[i] == dev)
+ return true;
+ }
+ }
+ return false;
+}
+
static int iommu_should_identity_map(struct pci_dev *pdev, int startup)
{
+
+ /*
+ * We want to prevent any device associated with an RMRR from
+ * getting placed into the SI Domain. This is done because
+ * problems exist when devices are moved in and out of domains
+ * and their respective RMRR info is lost. We exempt USB devices
+ * from this process due to their usage of RMRRs that are known
+ * to not be needed after BIOS hand-off to OS.
+ */
+ if (device_has_rmrr(pdev) &&
+ (pdev->class >> 8) != PCI_CLASS_SERIAL_USB)
+ return 0;
+
if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
return 1;
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index badc17c2bcb4..18108c1405e2 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -16,13 +16,13 @@
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
-#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/iommu.h>
#include <linux/omap-iommu.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/pm_runtime.h>
#include <asm/cacheflush.h>
@@ -143,31 +143,44 @@ EXPORT_SYMBOL_GPL(omap_iommu_arch_version);
static int iommu_enable(struct omap_iommu *obj)
{
int err;
+ struct platform_device *pdev = to_platform_device(obj->dev);
+ struct iommu_platform_data *pdata = pdev->dev.platform_data;
- if (!obj)
+ if (!obj || !pdata)
return -EINVAL;
if (!arch_iommu)
return -ENODEV;
- clk_enable(obj->clk);
+ if (pdata->deassert_reset) {
+ err = pdata->deassert_reset(pdev, pdata->reset_name);
+ if (err) {
+ dev_err(obj->dev, "deassert_reset failed: %d\n", err);
+ return err;
+ }
+ }
+
+ pm_runtime_get_sync(obj->dev);
err = arch_iommu->enable(obj);
- clk_disable(obj->clk);
return err;
}
static void iommu_disable(struct omap_iommu *obj)
{
- if (!obj)
- return;
+ struct platform_device *pdev = to_platform_device(obj->dev);
+ struct iommu_platform_data *pdata = pdev->dev.platform_data;
- clk_enable(obj->clk);
+ if (!obj || !pdata)
+ return;
arch_iommu->disable(obj);
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
+
+ if (pdata->assert_reset)
+ pdata->assert_reset(pdev, pdata->reset_name);
}
/*
@@ -290,7 +303,7 @@ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
if (!obj || !obj->nr_tlb_entries || !e)
return -EINVAL;
- clk_enable(obj->clk);
+ pm_runtime_get_sync(obj->dev);
iotlb_lock_get(obj, &l);
if (l.base == obj->nr_tlb_entries) {
@@ -320,7 +333,7 @@ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
cr = iotlb_alloc_cr(obj, e);
if (IS_ERR(cr)) {
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
return PTR_ERR(cr);
}
@@ -334,7 +347,7 @@ static int load_iotlb_entry(struct omap_iommu *obj, struct iotlb_entry *e)
l.vict = l.base;
iotlb_lock_set(obj, &l);
out:
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
return err;
}
@@ -364,7 +377,7 @@ static void flush_iotlb_page(struct omap_iommu *obj, u32 da)
int i;
struct cr_regs cr;
- clk_enable(obj->clk);
+ pm_runtime_get_sync(obj->dev);
for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, cr) {
u32 start;
@@ -383,7 +396,7 @@ static void flush_iotlb_page(struct omap_iommu *obj, u32 da)
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
}
}
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
if (i == obj->nr_tlb_entries)
dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
@@ -397,7 +410,7 @@ static void flush_iotlb_all(struct omap_iommu *obj)
{
struct iotlb_lock l;
- clk_enable(obj->clk);
+ pm_runtime_get_sync(obj->dev);
l.base = 0;
l.vict = 0;
@@ -405,7 +418,7 @@ static void flush_iotlb_all(struct omap_iommu *obj)
iommu_write_reg(obj, 1, MMU_GFLUSH);
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
}
#if defined(CONFIG_OMAP_IOMMU_DEBUG) || defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
@@ -415,11 +428,11 @@ ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t bytes)
if (!obj || !buf)
return -EINVAL;
- clk_enable(obj->clk);
+ pm_runtime_get_sync(obj->dev);
bytes = arch_iommu->dump_ctx(obj, buf, bytes);
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
return bytes;
}
@@ -433,7 +446,7 @@ __dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
struct cr_regs tmp;
struct cr_regs *p = crs;
- clk_enable(obj->clk);
+ pm_runtime_get_sync(obj->dev);
iotlb_lock_get(obj, &saved);
for_each_iotlb_cr(obj, num, i, tmp) {
@@ -443,7 +456,7 @@ __dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
}
iotlb_lock_set(obj, &saved);
- clk_disable(obj->clk);
+ pm_runtime_put_sync(obj->dev);
return p - crs;
}
@@ -807,9 +820,7 @@ static irqreturn_t iommu_fault_handler(int irq, void *data)
if (!obj->refcount)
return IRQ_NONE;
- clk_enable(obj->clk);
errs = iommu_report_fault(obj, &da);
- clk_disable(obj->clk);
if (errs == 0)
return IRQ_HANDLED;
@@ -931,17 +942,10 @@ static int __devinit omap_iommu_probe(struct platform_device *pdev)
struct resource *res;
struct iommu_platform_data *pdata = pdev->dev.platform_data;
- if (pdev->num_resources != 2)
- return -EINVAL;
-
obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
if (!obj)
return -ENOMEM;
- obj->clk = clk_get(&pdev->dev, pdata->clk_name);
- if (IS_ERR(obj->clk))
- goto err_clk;
-
obj->nr_tlb_entries = pdata->nr_tlb_entries;
obj->name = pdata->name;
obj->dev = &pdev->dev;
@@ -984,6 +988,9 @@ static int __devinit omap_iommu_probe(struct platform_device *pdev)
goto err_irq;
platform_set_drvdata(pdev, obj);
+ pm_runtime_irq_safe(obj->dev);
+ pm_runtime_enable(obj->dev);
+
dev_info(&pdev->dev, "%s registered\n", obj->name);
return 0;
@@ -992,8 +999,6 @@ err_irq:
err_ioremap:
release_mem_region(res->start, resource_size(res));
err_mem:
- clk_put(obj->clk);
-err_clk:
kfree(obj);
return err;
}
@@ -1014,7 +1019,8 @@ static int __devexit omap_iommu_remove(struct platform_device *pdev)
release_mem_region(res->start, resource_size(res));
iounmap(obj->regbase);
- clk_put(obj->clk);
+ pm_runtime_disable(obj->dev);
+
dev_info(&pdev->dev, "%s removed\n", obj->name);
kfree(obj);
return 0;
diff --git a/drivers/iommu/omap-iommu.h b/drivers/iommu/omap-iommu.h
index 2b5f3c04d167..120084206602 100644
--- a/drivers/iommu/omap-iommu.h
+++ b/drivers/iommu/omap-iommu.h
@@ -29,7 +29,6 @@ struct iotlb_entry {
struct omap_iommu {
const char *name;
struct module *owner;
- struct clk *clk;
void __iomem *regbase;
struct device *dev;
void *isr_priv;
@@ -116,8 +115,6 @@ static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
* MMU Register offsets
*/
#define MMU_REVISION 0x00
-#define MMU_SYSCONFIG 0x10
-#define MMU_SYSSTATUS 0x14
#define MMU_IRQSTATUS 0x18
#define MMU_IRQENABLE 0x1c
#define MMU_WALKING_ST 0x40
diff --git a/drivers/iommu/omap-iommu2.c b/drivers/iommu/omap-iommu2.c
index c02020292377..d745094a69dd 100644
--- a/drivers/iommu/omap-iommu2.c
+++ b/drivers/iommu/omap-iommu2.c
@@ -28,19 +28,6 @@
*/
#define IOMMU_ARCH_VERSION 0x00000011
-/* SYSCONF */
-#define MMU_SYS_IDLE_SHIFT 3
-#define MMU_SYS_IDLE_FORCE (0 << MMU_SYS_IDLE_SHIFT)
-#define MMU_SYS_IDLE_NONE (1 << MMU_SYS_IDLE_SHIFT)
-#define MMU_SYS_IDLE_SMART (2 << MMU_SYS_IDLE_SHIFT)
-#define MMU_SYS_IDLE_MASK (3 << MMU_SYS_IDLE_SHIFT)
-
-#define MMU_SYS_SOFTRESET (1 << 1)
-#define MMU_SYS_AUTOIDLE 1
-
-/* SYSSTATUS */
-#define MMU_SYS_RESETDONE 1
-
/* IRQSTATUS & IRQENABLE */
#define MMU_IRQ_MULTIHITFAULT (1 << 4)
#define MMU_IRQ_TABLEWALKFAULT (1 << 3)
@@ -97,7 +84,6 @@ static void __iommu_set_twl(struct omap_iommu *obj, bool on)
static int omap2_iommu_enable(struct omap_iommu *obj)
{
u32 l, pa;
- unsigned long timeout;
if (!obj->iopgd || !IS_ALIGNED((u32)obj->iopgd, SZ_16K))
return -EINVAL;
@@ -106,29 +92,10 @@ static int omap2_iommu_enable(struct omap_iommu *obj)
if (!IS_ALIGNED(pa, SZ_16K))
return -EINVAL;
- iommu_write_reg(obj, MMU_SYS_SOFTRESET, MMU_SYSCONFIG);
-
- timeout = jiffies + msecs_to_jiffies(20);
- do {
- l = iommu_read_reg(obj, MMU_SYSSTATUS);
- if (l & MMU_SYS_RESETDONE)
- break;
- } while (!time_after(jiffies, timeout));
-
- if (!(l & MMU_SYS_RESETDONE)) {
- dev_err(obj->dev, "can't take mmu out of reset\n");
- return -ENODEV;
- }
-
l = iommu_read_reg(obj, MMU_REVISION);
dev_info(obj->dev, "%s: version %d.%d\n", obj->name,
(l >> 4) & 0xf, l & 0xf);
- l = iommu_read_reg(obj, MMU_SYSCONFIG);
- l &= ~MMU_SYS_IDLE_MASK;
- l |= (MMU_SYS_IDLE_SMART | MMU_SYS_AUTOIDLE);
- iommu_write_reg(obj, l, MMU_SYSCONFIG);
-
iommu_write_reg(obj, pa, MMU_TTB);
__iommu_set_twl(obj, true);
@@ -142,7 +109,6 @@ static void omap2_iommu_disable(struct omap_iommu *obj)
l &= ~MMU_CNTL_MASK;
iommu_write_reg(obj, l, MMU_CNTL);
- iommu_write_reg(obj, MMU_SYS_IDLE_FORCE, MMU_SYSCONFIG);
dev_dbg(obj->dev, "%s is shutting down\n", obj->name);
}
@@ -271,8 +237,6 @@ omap2_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len)
char *p = buf;
pr_reg(REVISION);
- pr_reg(SYSCONFIG);
- pr_reg(SYSSTATUS);
pr_reg(IRQSTATUS);
pr_reg(IRQENABLE);
pr_reg(WALKING_ST);
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index c16e8fc8a4bd..4c9db62814ff 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -398,6 +398,7 @@ static int tegra_gart_probe(struct platform_device *pdev)
do_gart_setup(gart, NULL);
gart_handle = gart;
+ bus_set_iommu(&platform_bus_type, &gart_iommu_ops);
return 0;
fail:
@@ -450,7 +451,6 @@ static struct platform_driver tegra_gart_driver = {
static int __devinit tegra_gart_init(void)
{
- bus_set_iommu(&platform_bus_type, &gart_iommu_ops);
return platform_driver_register(&tegra_gart_driver);
}
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 4252d743963d..25c1210c0832 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -694,10 +694,8 @@ static void __smmu_iommu_unmap(struct smmu_as *as, dma_addr_t iova)
*pte = _PTE_VACANT(iova);
FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0);
- if (!--(*count)) {
+ if (!--(*count))
free_ptbl(as, iova);
- smmu_flush_regs(as->smmu, 0);
- }
}
static void __smmu_iommu_map_pfn(struct smmu_as *as, dma_addr_t iova,
@@ -1232,6 +1230,7 @@ static int tegra_smmu_probe(struct platform_device *pdev)
smmu_debugfs_create(smmu);
smmu_handle = smmu;
+ bus_set_iommu(&platform_bus_type, &smmu_iommu_ops);
return 0;
}
@@ -1276,7 +1275,6 @@ static struct platform_driver tegra_smmu_driver = {
static int __devinit tegra_smmu_init(void)
{
- bus_set_iommu(&platform_bus_type, &smmu_iommu_ops);
return platform_driver_register(&tegra_smmu_driver);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-22 21:00:19 +0000