This allows to inquire if SMMU is populated or not.
Suggested by Thierry Reding and copied his example code.
Signed-off-by: Hiroshi Doyu <hdoyu@xxxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
---
v6:
New for v6.
---
drivers/iommu/tegra-smmu.c | 55 +++++++++++++++++++++++++---------------------
1 file changed, 30 insertions(+), 25 deletions(-)
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 1544f7c..590c9fe 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -225,6 +225,8 @@ struct smmu_debugfs_info {
* Per SMMU device - IOMMU device
*/
struct smmu_device {
+ struct iommu iommu;
+
void __iomem *regbase; /* register offset base */
void __iomem **regs; /* register block start address array */
void __iomem **rege; /* register block end address array */
@@ -234,7 +236,6 @@ struct smmu_device {
unsigned long page_count; /* total remappable size */
spinlock_t lock;
char *name;
- struct device *dev;
struct rb_root clients;
struct page *avp_vector_page; /* dummy page shared by all AS's */
@@ -371,7 +372,7 @@ static int register_smmu_client(struct smmu_device *smmu,
return -EBUSY;
}
- client = devm_kzalloc(smmu->dev, sizeof(*client), GFP_KERNEL);
+ client = devm_kzalloc(smmu->iommu.dev, sizeof(*client), GFP_KERNEL);
if (!client)
return -ENOMEM;
@@ -388,7 +389,7 @@ static int smmu_of_get_swgroups(struct device *dev, unsigned long *swgroups)
of_property_for_each_phandle_with_args(dev->of_node, "iommus",
"#iommu-cells", i, &args) {
- if (args.np != smmu_handle->dev->of_node)
+ if (args.np != smmu_handle->iommu.dev->of_node)
continue;
BUG_ON(args.args_count != 2);
@@ -527,7 +528,7 @@ static void free_ptbl(struct smmu_as *as, dma_addr_t iova)
unsigned long *pdir = (unsigned long *)page_address(as->pdir_page);
if (pdir[pdn] != _PDE_VACANT(pdn)) {
- dev_dbg(as->smmu->dev, "pdn: %lx\n", pdn);
+ dev_dbg(as->smmu->iommu.dev, "pdn: %lx\n", pdn);
ClearPageReserved(SMMU_EX_PTBL_PAGE(pdir[pdn]));
__free_page(SMMU_EX_PTBL_PAGE(pdir[pdn]));
@@ -542,7 +543,7 @@ static void free_pdir(struct smmu_as *as)
{
unsigned addr;
int count;
- struct device *dev = as->smmu->dev;
+ struct device *dev = as->smmu->iommu.dev;
if (!as->pdir_page)
return;
@@ -585,11 +586,11 @@ static unsigned long *locate_pte(struct smmu_as *as,
unsigned long addr = SMMU_PDN_TO_ADDR(pdn);
/* Vacant - allocate a new page table */
- dev_dbg(as->smmu->dev, "New PTBL pdn: %lx\n", pdn);
+ dev_dbg(as->smmu->iommu.dev, "New PTBL pdn: %lx\n", pdn);
*ptbl_page_p = alloc_page(GFP_ATOMIC);
if (!*ptbl_page_p) {
- dev_err(as->smmu->dev,
+ dev_err(as->smmu->iommu.dev,
"failed to allocate smmu_device page table\n");
return NULL;
}
@@ -649,7 +650,7 @@ static int alloc_pdir(struct smmu_as *as)
/*
* do the allocation, then grab as->lock
*/
- cnt = devm_kzalloc(smmu->dev,
+ cnt = devm_kzalloc(smmu->iommu.dev,
sizeof(cnt[0]) * SMMU_PDIR_COUNT,
GFP_KERNEL);
page = alloc_page(GFP_KERNEL | __GFP_DMA);
@@ -663,7 +664,8 @@ static int alloc_pdir(struct smmu_as *as)
}
if (!page || !cnt) {
- dev_err(smmu->dev, "failed to allocate at %s\n", __func__);
+ dev_err(smmu->iommu.dev,
+ "failed to allocate at %s\n", __func__);
err = -ENOMEM;
goto err_out;
}
@@ -693,7 +695,7 @@ static int alloc_pdir(struct smmu_as *as)
err_out:
spin_unlock_irqrestore(&as->lock, flags);
- devm_kfree(smmu->dev, cnt);
+ devm_kfree(smmu->iommu.dev, cnt);
if (page)
__free_page(page);
return err;
@@ -748,7 +750,7 @@ static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova,
unsigned long pfn = __phys_to_pfn(pa);
unsigned long flags;
- dev_info(as->smmu->dev, "[%d] %08lx:%pa\n", as->asid, iova, &pa);
+ dev_info(as->smmu->iommu.dev, "[%d] %08lx:%pa\n", as->asid, iova, &pa);
if (!pfn_valid(pfn))
return -ENOMEM;
@@ -765,7 +767,7 @@ static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
struct smmu_as *as = domain->priv;
unsigned long flags;
- dev_dbg(as->smmu->dev, "[%d] %08lx\n", as->asid, iova);
+ dev_dbg(as->smmu->iommu.dev, "[%d] %08lx\n", as->asid, iova);
spin_lock_irqsave(&as->lock, flags);
__smmu_iommu_unmap(as, iova);
@@ -788,7 +790,7 @@ static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain,
pte = locate_pte(as, iova, true, &page, &count);
pfn = *pte & SMMU_PFN_MASK;
WARN_ON(!pfn_valid(pfn));
- dev_dbg(as->smmu->dev,
+ dev_dbg(as->smmu->iommu.dev,
"iova:%08llx pfn:%08lx asid:%d\n", (unsigned long long)iova,
pfn, as->asid);
@@ -822,7 +824,7 @@ static int smmu_iommu_attach_dev(struct iommu_domain *domain,
spin_lock(&as->client_lock);
list_for_each_entry(c, &as->client, list) {
if (c->dev == dev) {
- dev_err(smmu->dev,
+ dev_err(smmu->iommu.dev,
"%s is already attached\n", dev_name(c->dev));
err = -EINVAL;
goto err_client;
@@ -844,7 +846,7 @@ static int smmu_iommu_attach_dev(struct iommu_domain *domain,
pr_info("Reserve \"page zero\" for AVP vectors using a common dummy\n");
}
- dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev));
+ dev_dbg(smmu->iommu.dev, "%s is attached\n", dev_name(dev));
return 0;
err_client:
@@ -867,12 +869,12 @@ static void smmu_iommu_detach_dev(struct iommu_domain *domain,
smmu_client_disable_swgroups(c);
list_del(&c->list);
c->as = NULL;
- dev_dbg(smmu->dev,
+ dev_dbg(smmu->iommu.dev,
"%s is detached\n", dev_name(c->dev));
goto out;
}
}
- dev_err(smmu->dev, "Couldn't find %s\n", dev_name(dev));
+ dev_err(smmu->iommu.dev, "Couldn't find %s\n", dev_name(dev));
out:
spin_unlock(&as->client_lock);
}
@@ -899,7 +901,7 @@ static int smmu_iommu_domain_init(struct iommu_domain *domain)
break;
}
if (i == smmu->num_as)
- dev_err(smmu->dev, "no free AS\n");
+ dev_err(smmu->iommu.dev, "no free AS\n");
return err;
found:
@@ -920,7 +922,7 @@ found:
smmu->page_count * SMMU_PAGE_SIZE - 1;
domain->geometry.force_aperture = true;
- dev_dbg(smmu->dev, "smmu_as@%p\n", as);
+ dev_dbg(smmu->iommu.dev, "smmu_as@%p\n", as);
return 0;
}
@@ -953,7 +955,7 @@ static void smmu_iommu_domain_destroy(struct iommu_domain *domain)
spin_unlock_irqrestore(&as->lock, flags);
domain->priv = NULL;
- dev_dbg(smmu->dev, "smmu_as@%p\n", as);
+ dev_dbg(smmu->iommu.dev, "smmu_as@%p\n", as);
}
/*
@@ -1085,7 +1087,7 @@ static ssize_t smmu_debugfs_stats_write(struct file *file,
break;
}
- dev_dbg(smmu->dev, "%s() %08x, %08x @%08x\n", __func__,
+ dev_dbg(smmu->iommu.dev, "%s() %08x, %08x @%08x\n", __func__,
val, smmu_read(smmu, offs), offs);
return count;
@@ -1107,7 +1109,7 @@ static int smmu_debugfs_stats_show(struct seq_file *s, void *v)
val = smmu_read(smmu, offs);
seq_printf(s, "%s:%08x ", stats[i], val);
- dev_dbg(smmu->dev, "%s() %s %08x @%08x\n", __func__,
+ dev_dbg(smmu->iommu.dev, "%s() %s %08x @%08x\n", __func__,
stats[i], val, offs);
}
seq_printf(s, "\n");
@@ -1145,7 +1147,7 @@ static void smmu_debugfs_create(struct smmu_device *smmu)
if (!smmu->debugfs_info)
return;
- root = debugfs_create_dir(dev_name(smmu->dev), NULL);
+ root = debugfs_create_dir(dev_name(smmu->iommu.dev), NULL);
if (!root)
goto err_out;
smmu->debugfs_root = root;
@@ -1217,7 +1219,7 @@ static void tegra_smmu_create_default_map(struct smmu_device *smmu)
smmu->map[i] = arm_iommu_create_mapping(&platform_bus_type,
base, size, 0);
if (IS_ERR(smmu->map[i]))
- dev_err(smmu->dev,
+ dev_err(smmu->iommu.dev,
"Couldn't create: asid=%d map=%p %pa-%pa\n",
i, smmu->map[i], &base, &base + size - 1);
}
@@ -1285,7 +1287,7 @@ static int tegra_smmu_probe(struct platform_device *pdev)
if (!smmu->ahb)
return -ENODEV;
- smmu->dev = dev;
+ smmu->iommu.dev = dev;
smmu->num_as = asids;
smmu->iovmm_base = base;
smmu->page_count = size;
@@ -1322,6 +1324,8 @@ static int tegra_smmu_probe(struct platform_device *pdev)
smmu_handle = smmu;
bus_set_iommu(&platform_bus_type, &smmu_iommu_ops);
tegra_smmu_create_default_map(smmu);
+
+ iommu_add(&smmu->iommu);
return 0;
}
@@ -1337,6 +1341,7 @@ static int tegra_smmu_remove(struct platform_device *pdev)
free_pdir(&smmu->as[i]);
__free_page(smmu->avp_vector_page);
smmu_handle = NULL;
+ iommu_del(&smmu->iommu);
return 0;
}
--
1.8.1.5
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