[PATCH 10/15] iommu/arm-smmu: Use accessor functions for iommu private data

Joerg Roedel
2020-03-10T09:12:24Z

From: Joerg Roedel <jroedel@suse.de>

Make use of dev_iommu_priv_set/get() functions and simplify the code
where possible with this change.

Tested-by: Will Deacon <will@kernel.org> # arm-smmu
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/arm-smmu.c | 56 +++++++++++++++++++++-------------------
1 file changed, 29 insertions(+), 27 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 980aae73b45b..8276fff5f7dc 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -98,12 +98,15 @@ struct arm_smmu_master_cfg {
s16 smendx[];
};
#define INVALID_SMENDX -1
-#define __fwspec_cfg(fw) ((struct arm_smmu_master_cfg *)fw->iommu_priv)
-#define fwspec_smmu(fw) (__fwspec_cfg(fw)->smmu)
-#define fwspec_smendx(fw, i) \
- (i >= fw->num_ids ? INVALID_SMENDX : __fwspec_cfg(fw)->smendx[i])
-#define for_each_cfg_sme(fw, i, idx) \
- for (i = 0; idx = fwspec_smendx(fw, i), i < fw->num_ids; ++i)
+#define __fwspec_cfg(dev) ((struct arm_smmu_master_cfg *)dev_iommu_priv_get(dev))
+#define fwspec_smmu(dev) (__fwspec_cfg(dev)->smmu)
+#define fwspec_smendx(dev, i) \
+ (i >= dev_iommu_fwspec_get(dev)->num_ids ? \
+ INVALID_SMENDX : \
+ __fwspec_cfg(dev)->smendx[i])
+#define for_each_cfg_sme(dev, i, idx) \
+ for (i = 0; idx = fwspec_smendx(dev, i), \
+ i < dev_iommu_fwspec_get(dev)->num_ids; ++i)

static bool using_legacy_binding, using_generic_binding;

@@ -1061,7 +1064,7 @@ static bool arm_smmu_free_sme(struct arm_smmu_device *smmu, int idx)
static int arm_smmu_master_alloc_smes(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
+ struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
struct arm_smmu_device *smmu = cfg->smmu;
struct arm_smmu_smr *smrs = smmu->smrs;
struct iommu_group *group;
@@ -1069,7 +1072,7 @@ static int arm_smmu_master_alloc_smes(struct device *dev)

mutex_lock(&smmu->stream_map_mutex);
/* Figure out a viable stream map entry allocation */
- for_each_cfg_sme(fwspec, i, idx) {
+ for_each_cfg_sme(dev, i, idx) {
u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]);
u16 mask = FIELD_GET(ARM_SMMU_SMR_MASK, fwspec->ids[i]);

@@ -1100,7 +1103,7 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
iommu_group_put(group);

/* It worked! Now, poke the actual hardware */
- for_each_cfg_sme(fwspec, i, idx) {
+ for_each_cfg_sme(dev, i, idx) {
arm_smmu_write_sme(smmu, idx);
smmu->s2crs[idx].group = group;
}
@@ -1117,14 +1120,14 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
return ret;
}

-static void arm_smmu_master_free_smes(struct iommu_fwspec *fwspec)
+static void arm_smmu_master_free_smes(struct device *dev)
{
- struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
- struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
+ struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
+ struct arm_smmu_device *smmu = fwspec_smmu(dev);
int i, idx;

mutex_lock(&smmu->stream_map_mutex);
- for_each_cfg_sme(fwspec, i, idx) {
+ for_each_cfg_sme(dev, i, idx) {
if (arm_smmu_free_sme(smmu, idx))
arm_smmu_write_sme(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
@@ -1133,7 +1136,7 @@ static void arm_smmu_master_free_smes(struct iommu_fwspec *fwspec)
}

static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
- struct iommu_fwspec *fwspec)
+ struct device *dev)
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
@@ -1146,7 +1149,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
else
type = S2CR_TYPE_TRANS;

- for_each_cfg_sme(fwspec, i, idx) {
+ for_each_cfg_sme(dev, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;

@@ -1160,10 +1163,10 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,

static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
- int ret;
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct arm_smmu_device *smmu;
- struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ int ret;

if (!fwspec || fwspec->ops != &arm_smmu_ops) {
dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
@@ -1177,10 +1180,10 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
* domains, just say no (but more politely than by dereferencing NULL).
* This should be at least a WARN_ON once that's sorted.
*/
- if (!fwspec->iommu_priv)
+ if (!dev_iommu_priv_get(dev))
return -ENODEV;

- smmu = fwspec_smmu(fwspec);
+ smmu = fwspec_smmu(dev);

ret = arm_smmu_rpm_get(smmu);
if (ret < 0)
@@ -1204,7 +1207,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
}

/* Looks ok, so add the device to the domain */
- ret = arm_smmu_domain_add_master(smmu_domain, fwspec);
+ ret = arm_smmu_domain_add_master(smmu_domain, dev);

/*
* Setup an autosuspend delay to avoid bouncing runpm state.
@@ -1429,7 +1432,7 @@ static int arm_smmu_add_device(struct device *dev)
goto out_free;

cfg->smmu = smmu;
- fwspec->iommu_priv = cfg;
+ dev_iommu_priv_set(dev, cfg);
while (i--)
cfg->smendx[i] = INVALID_SMENDX;

@@ -1467,7 +1470,7 @@ static void arm_smmu_remove_device(struct device *dev)
if (!fwspec || fwspec->ops != &arm_smmu_ops)
return;

- cfg = fwspec->iommu_priv;
+ cfg = dev_iommu_priv_get(dev);
smmu = cfg->smmu;

ret = arm_smmu_rpm_get(smmu);
@@ -1475,23 +1478,22 @@ static void arm_smmu_remove_device(struct device *dev)
return;

iommu_device_unlink(&smmu->iommu, dev);
- arm_smmu_master_free_smes(fwspec);
+ arm_smmu_master_free_smes(dev);

arm_smmu_rpm_put(smmu);

iommu_group_remove_device(dev);
- kfree(fwspec->iommu_priv);
iommu_fwspec_free(dev);
+ kfree(cfg);
}

static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
+ struct arm_smmu_device *smmu = fwspec_smmu(dev);
struct iommu_group *group = NULL;
int i, idx;

- for_each_cfg_sme(fwspec, i, idx) {
+ for_each_cfg_sme(dev, i, idx) {
if (group && smmu->s2crs[idx].group &&
group != smmu->s2crs[idx].group)
return ERR_PTR(-EINVAL);
--
2.17.1