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iommu/arm-smmu: Refactor master_cfg/fwspec usage
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In preparation for restructuring iommu_fwspec, refactor the way we
access the arm_smmu_master_cfg private data to be less dependent on
the current layout.

Signed-off-by: Robin Murphy <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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rmurphy-arm authored and joergroedel committed Mar 27, 2020
1 parent b7a9662 commit 2465170
Showing 1 changed file with 22 additions and 20 deletions.
42 changes: 22 additions & 20 deletions drivers/iommu/arm-smmu.c
Original file line number Diff line number Diff line change
Expand Up @@ -98,12 +98,10 @@ 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 cfg_smendx(cfg, fw, i) \
(i >= fw->num_ids ? INVALID_SMENDX : cfg->smendx[i])
#define for_each_cfg_sme(cfg, fw, i, idx) \
for (i = 0; idx = cfg_smendx(cfg, fw, i), i < fw->num_ids; ++i)

static bool using_legacy_binding, using_generic_binding;

Expand Down Expand Up @@ -1069,7 +1067,7 @@ 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(cfg, fwspec, i, idx) {
u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]);
u16 mask = FIELD_GET(ARM_SMMU_SMR_MASK, fwspec->ids[i]);

Expand Down Expand Up @@ -1100,7 +1098,7 @@ 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(cfg, fwspec, i, idx) {
arm_smmu_write_sme(smmu, idx);
smmu->s2crs[idx].group = group;
}
Expand All @@ -1117,14 +1115,14 @@ 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 arm_smmu_master_cfg *cfg,
struct iommu_fwspec *fwspec)
{
struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
struct arm_smmu_device *smmu = cfg->smmu;
int i, idx;

mutex_lock(&smmu->stream_map_mutex);
for_each_cfg_sme(fwspec, i, idx) {
for_each_cfg_sme(cfg, fwspec, i, idx) {
if (arm_smmu_free_sme(smmu, idx))
arm_smmu_write_sme(smmu, idx);
cfg->smendx[i] = INVALID_SMENDX;
Expand All @@ -1133,6 +1131,7 @@ 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 arm_smmu_master_cfg *cfg,
struct iommu_fwspec *fwspec)
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
Expand All @@ -1146,7 +1145,7 @@ 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(cfg, fwspec, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;

Expand All @@ -1162,8 +1161,9 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret;
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_master_cfg *cfg;
struct arm_smmu_device *smmu;

if (!fwspec || fwspec->ops != &arm_smmu_ops) {
dev_err(dev, "cannot attach to SMMU, is it on the same bus?\n");
Expand All @@ -1177,10 +1177,11 @@ 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)
cfg = fwspec->iommu_priv;
if (!cfg)
return -ENODEV;

smmu = fwspec_smmu(fwspec);
smmu = cfg->smmu;

ret = arm_smmu_rpm_get(smmu);
if (ret < 0)
Expand All @@ -1204,7 +1205,7 @@ 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, cfg, fwspec);

/*
* Setup an autosuspend delay to avoid bouncing runpm state.
Expand Down Expand Up @@ -1475,7 +1476,7 @@ 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(cfg, fwspec);

arm_smmu_rpm_put(smmu);

Expand All @@ -1487,11 +1488,12 @@ static void arm_smmu_remove_device(struct device *dev)
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_master_cfg *cfg = fwspec->iommu_priv;
struct arm_smmu_device *smmu = cfg->smmu;
struct iommu_group *group = NULL;
int i, idx;

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

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