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iommu/arm-smmu-v3: Add context descriptor tables allocators

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Support for SSID will require allocating context descriptor tables. Move
the context descriptor allocation to separate functions.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jean-Philippe Brucker 2020-01-15 13:52:32 +01:00 committed by Will Deacon
parent 7bc4f3fae9
commit a557aff0c7
1 changed files with 34 additions and 13 deletions
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47
drivers/iommu/arm-smmu-v3.c
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@ -552,11 +552,13 @@ struct arm_smmu_ctx_desc {
struct arm_smmu_ctx_desc_cfg {
__le64 *cdtab;
dma_addr_t cdtab_dma;
unsigned int num_l1_ents;
};
struct arm_smmu_s1_cfg {
struct arm_smmu_ctx_desc_cfg cdcfg;
struct arm_smmu_ctx_desc cd;
u8 s1cdmax;
};
struct arm_smmu_s2_cfg {
@ -1475,6 +1477,35 @@ static void arm_smmu_write_ctx_desc(struct arm_smmu_device *smmu,
cdptr[3] = cpu_to_le64(cfg->cd.mair);
}
static int arm_smmu_alloc_cd_tables(struct arm_smmu_domain *smmu_domain)
{
size_t l1size;
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
struct arm_smmu_ctx_desc_cfg *cdcfg = &cfg->cdcfg;
cdcfg->num_l1_ents = 1UL << cfg->s1cdmax;
l1size = cdcfg->num_l1_ents * (CTXDESC_CD_DWORDS << 3);
cdcfg->cdtab = dmam_alloc_coherent(smmu->dev, l1size, &cdcfg->cdtab_dma,
GFP_KERNEL);
if (!cdcfg->cdtab) {
dev_warn(smmu->dev, "failed to allocate context descriptor\n");
return -ENOMEM;
}
return 0;
}
static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain)
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_ctx_desc_cfg *cdcfg = &smmu_domain->s1_cfg.cdcfg;
size_t l1size = cdcfg->num_l1_ents * (CTXDESC_CD_DWORDS << 3);
dmam_free_coherent(smmu->dev, l1size, cdcfg->cdtab, cdcfg->cdtab_dma);
cdcfg->cdtab_dma = 0;
cdcfg->cdtab = NULL;
}
/* Stream table manipulation functions */
static void
arm_smmu_write_strtab_l1_desc(__le64 *dst, struct arm_smmu_strtab_l1_desc *desc)
@ -2118,11 +2149,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
if (cfg->cdcfg.cdtab) {
dmam_free_coherent(smmu_domain->smmu->dev,
CTXDESC_CD_DWORDS << 3,
cfg->cdcfg.cdtab,
cfg->cdcfg.cdtab_dma);
arm_smmu_free_cd_tables(smmu_domain);
arm_smmu_bitmap_free(smmu->asid_map, cfg->cd.asid);
}
} else {
@ -2147,15 +2174,9 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
if (asid < 0)
return asid;
cfg->cdcfg.cdtab = dmam_alloc_coherent(smmu->dev,
CTXDESC_CD_DWORDS << 3,
&cfg->cdcfg.cdtab_dma,
GFP_KERNEL);
if (!cfg->cdcfg.cdtab) {
dev_warn(smmu->dev, "failed to allocate context descriptor\n");
ret = -ENOMEM;
ret = arm_smmu_alloc_cd_tables(smmu_domain);
if (ret)
goto out_free_asid;
}
cfg->cd.asid = (u16)asid;
cfg->cd.ttbr = pgtbl_cfg->arm_lpae_s1_cfg.ttbr;