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iommu/arm-smmu: Make use of phandle iterators in device-tree parsing 

Remove the usage of of_parse_phandle_with_args() and replace
it by the phandle-iterator implementation so that we can
parse out all of the potentially present 128 stream-ids.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Joerg Roedel 2016-04-04 17:49:22 +02:00 committed by Rob Herring
parent abdaa77b18
commit cb6c27bb09
1 changed files with 30 additions and 8 deletions
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38
drivers/iommu/arm-smmu.c
View File

@ -49,7 +49,7 @@
#include "io-pgtable.h"
/* Maximum number of stream IDs assigned to a single device */
#define MAX_MASTER_STREAMIDS MAX_PHANDLE_ARGS
#define MAX_MASTER_STREAMIDS 128
/* Maximum number of context banks per SMMU */
#define ARM_SMMU_MAX_CBS 128
@ -357,6 +357,12 @@ struct arm_smmu_domain {
struct iommu_domain domain;
};
struct arm_smmu_phandle_args {
struct device_node *np;
int args_count;
uint32_t args[MAX_MASTER_STREAMIDS];
};
static struct iommu_ops arm_smmu_ops;
static DEFINE_SPINLOCK(arm_smmu_devices_lock);
@ -466,7 +472,7 @@ static int insert_smmu_master(struct arm_smmu_device *smmu,
static int register_smmu_master(struct arm_smmu_device *smmu,
struct device *dev,
struct of_phandle_args *masterspec)
struct arm_smmu_phandle_args *masterspec)
{
int i;
struct arm_smmu_master *master;
@ -1737,7 +1743,8 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
struct arm_smmu_device *smmu;
struct device *dev = &pdev->dev;
struct rb_node *node;
struct of_phandle_args masterspec;
struct of_phandle_iterator it;
struct arm_smmu_phandle_args *masterspec;
int num_irqs, i, err;
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
@ -1798,20 +1805,35 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
i = 0;
smmu->masters = RB_ROOT;
while (!of_parse_phandle_with_args(dev->of_node, "mmu-masters",
"#stream-id-cells", i,
&masterspec)) {
err = register_smmu_master(smmu, dev, &masterspec);
err = -ENOMEM;
/* No need to zero the memory for masterspec */
masterspec = kmalloc(sizeof(*masterspec), GFP_KERNEL);
if (!masterspec)
goto out_put_masters;
of_for_each_phandle(&it, err, dev->of_node,
"mmu-masters", "#stream-id-cells", 0) {
int count = of_phandle_iterator_args(&it, masterspec->args,
MAX_MASTER_STREAMIDS);
masterspec->np = of_node_get(it.node);
masterspec->args_count = count;
err = register_smmu_master(smmu, dev, masterspec);
if (err) {
dev_err(dev, "failed to add master %s\n",
masterspec.np->name);
masterspec->np->name);
kfree(masterspec);
goto out_put_masters;
}
i++;
}
dev_notice(dev, "registered %d master devices\n", i);
kfree(masterspec);
parse_driver_options(smmu);
if (smmu->version > ARM_SMMU_V1 &&