[PATCH v8 12/29] iommu/smmuv3: Dynamically allocate s1_cfg and s2_cfg

Eric Auger
2019-05-26T16:11:30Z

In preparation for the introduction of nested configuration
let's turn s1_cfg and s2_cfg fields into pointers which are
dynamically allocated depending on the smmu_domain stage.

In nested mode, s1_cfg will only be allocated when setting up
S1 translation.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
drivers/iommu/arm-smmu-v3.c | 88 +++++++++++++++++++++----------------
1 file changed, 49 insertions(+), 39 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 1c9f0444a81b..7be509ed86d9 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -634,10 +634,8 @@ struct arm_smmu_domain {
bool non_strict;

enum arm_smmu_domain_stage stage;
- union {
- struct arm_smmu_s1_cfg s1_cfg;
- struct arm_smmu_s2_cfg s2_cfg;
- };
+ struct arm_smmu_s1_cfg *s1_cfg;
+ struct arm_smmu_s2_cfg *s2_cfg;

struct iommu_domain domain;

@@ -1165,17 +1163,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
}

if (smmu_domain) {
- switch (smmu_domain->stage) {
- case ARM_SMMU_DOMAIN_S1:
- s1_cfg = &smmu_domain->s1_cfg;
- break;
- case ARM_SMMU_DOMAIN_S2:
- case ARM_SMMU_DOMAIN_NESTED:
- s2_cfg = &smmu_domain->s2_cfg;
- break;
- default:
- break;
- }
+ s1_cfg = smmu_domain->s1_cfg;
+ s2_cfg = smmu_domain->s2_cfg;
}

if (val & STRTAB_STE_0_V) {
@@ -1587,11 +1576,11 @@ static void arm_smmu_tlb_inv_context(void *cookie)

if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
cmd.opcode = CMDQ_OP_TLBI_NH_ASID;
- cmd.tlbi.asid = smmu_domain->s1_cfg.cd.asid;
+ cmd.tlbi.asid = smmu_domain->s1_cfg->cd.asid;
cmd.tlbi.vmid = 0;
} else {
cmd.opcode = CMDQ_OP_TLBI_S12_VMALL;
- cmd.tlbi.vmid = smmu_domain->s2_cfg.vmid;
+ cmd.tlbi.vmid = smmu_domain->s2_cfg->vmid;
}

/*
@@ -1618,10 +1607,10 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,

if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
cmd.opcode = CMDQ_OP_TLBI_NH_VA;
- cmd.tlbi.asid = smmu_domain->s1_cfg.cd.asid;
+ cmd.tlbi.asid = smmu_domain->s1_cfg->cd.asid;
} else {
cmd.opcode = CMDQ_OP_TLBI_S2_IPA;
- cmd.tlbi.vmid = smmu_domain->s2_cfg.vmid;
+ cmd.tlbi.vmid = smmu_domain->s2_cfg->vmid;
}

do {
@@ -1702,26 +1691,29 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_device *smmu = smmu_domain->smmu;
+ struct arm_smmu_s1_cfg *s1_cfg = smmu_domain->s1_cfg;
+ struct arm_smmu_s2_cfg *s2_cfg = smmu_domain->s2_cfg;

iommu_put_dma_cookie(domain);
free_io_pgtable_ops(smmu_domain->pgtbl_ops);

- /* Free the CD and ASID, if we allocated them */
- if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
- struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
-
- if (cfg->cdptr) {
+ if (s1_cfg) {
+ /* Free the CD and ASID, if we allocated them */
+ if (s1_cfg->cdptr) {
dmam_free_coherent(smmu_domain->smmu->dev,
CTXDESC_CD_DWORDS << 3,
- cfg->cdptr,
- cfg->cdptr_dma);
+ s1_cfg->cdptr,
+ s1_cfg->cdptr_dma);

- arm_smmu_bitmap_free(smmu->asid_map, cfg->cd.asid);
+ arm_smmu_bitmap_free(smmu->asid_map,
+ s1_cfg->cd.asid);
}
- } else {
- struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
- if (cfg->vmid)
- arm_smmu_bitmap_free(smmu->vmid_map, cfg->vmid);
+ kfree(s1_cfg);
+ }
+ if (s2_cfg) {
+ if (s2_cfg->vmid)
+ arm_smmu_bitmap_free(smmu->vmid_map, s2_cfg->vmid);
+ kfree(s2_cfg);
}

kfree(smmu_domain);
@@ -1733,11 +1725,16 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
int ret;
int asid;
struct arm_smmu_device *smmu = smmu_domain->smmu;
- struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
+ struct arm_smmu_s1_cfg *cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+
+ if (!cfg)
+ return -ENOMEM;

asid = arm_smmu_bitmap_alloc(smmu->asid_map, smmu->asid_bits);
- if (asid < 0)
- return asid;
+ if (asid < 0) {
+ ret = asid;
+ goto out_free_cfg;
+ }

cfg->cdptr = dmam_alloc_coherent(smmu->dev, CTXDESC_CD_DWORDS << 3,
&cfg->cdptr_dma,
@@ -1752,28 +1749,41 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
cfg->cd.ttbr = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
cfg->cd.tcr = pgtbl_cfg->arm_lpae_s1_cfg.tcr;
cfg->cd.mair = pgtbl_cfg->arm_lpae_s1_cfg.mair[0];
+ smmu_domain->s1_cfg = cfg;
return 0;

out_free_asid:
arm_smmu_bitmap_free(smmu->asid_map, asid);
+out_free_cfg:
+ kfree(cfg);
return ret;
}

static int arm_smmu_domain_finalise_s2(struct arm_smmu_domain *smmu_domain,
struct io_pgtable_cfg *pgtbl_cfg)
{
- int vmid;
+ int vmid, ret;
struct arm_smmu_device *smmu = smmu_domain->smmu;
- struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
+ struct arm_smmu_s2_cfg *cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+
+ if (!cfg)
+ return -ENOMEM;

vmid = arm_smmu_bitmap_alloc(smmu->vmid_map, smmu->vmid_bits);
- if (vmid < 0)
- return vmid;
+ if (vmid < 0) {
+ ret = vmid;
+ goto out_free_cfg;
+ }

cfg->vmid = (u16)vmid;
cfg->vttbr = pgtbl_cfg->arm_lpae_s2_cfg.vttbr;
cfg->vtcr = pgtbl_cfg->arm_lpae_s2_cfg.vtcr;
+ smmu_domain->s2_cfg = cfg;
return 0;
+
+out_free_cfg:
+ kfree(cfg);
+ return ret;
}

static int arm_smmu_domain_finalise(struct iommu_domain *domain)
@@ -1992,7 +2002,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
arm_smmu_enable_ats(master);

if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1)
- arm_smmu_write_ctx_desc(smmu, &smmu_domain->s1_cfg);
+ arm_smmu_write_ctx_desc(smmu, smmu_domain->s1_cfg);

arm_smmu_install_ste_for_dev(master);
out_unlock:
--
2.20.1