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@xxxxxxxxxx>
---
drivers/iommu/arm-smmu-v3.c | 57 ++++++++++++++++++++++++++++++-------
1 file changed, 46 insertions(+), 11 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index b287e303b1d7..43d6a7ded6e4 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -568,6 +568,7 @@ struct arm_smmu_cd_table {
struct arm_smmu_s1_cfg {
struct arm_smmu_cd_table table;
struct arm_smmu_ctx_desc cd;
+ u8 s1cdmax;
};
struct arm_smmu_s2_cfg {
@@ -1455,6 +1456,31 @@ static int arm_smmu_cmdq_issue_sync(struct arm_smmu_device *smmu)
}
/* Context descriptor manipulation functions */
+static int arm_smmu_alloc_cd_leaf_table(struct arm_smmu_device *smmu,
+ struct arm_smmu_cd_table *table,
+ size_t num_entries)
+{
+ size_t size = num_entries * (CTXDESC_CD_DWORDS << 3);
+
+ table->ptr = dmam_alloc_coherent(smmu->dev, size, &table->ptr_dma,
+ GFP_KERNEL);
+ if (!table->ptr) {
+ dev_warn(smmu->dev,
+ "failed to allocate context descriptor table\n");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void arm_smmu_free_cd_leaf_table(struct arm_smmu_device *smmu,
+ struct arm_smmu_cd_table *table,
+ size_t num_entries)
+{
+ size_t size = num_entries * (CTXDESC_CD_DWORDS << 3);
+
+ dmam_free_coherent(smmu->dev, size, table->ptr, table->ptr_dma);
+}
+
static u64 arm_smmu_cpu_tcr_to_cd(u64 tcr)
{
u64 val = 0;
@@ -1502,6 +1528,23 @@ 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)
+{
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
+
+ return arm_smmu_alloc_cd_leaf_table(smmu, &cfg->table,
+ 1 << cfg->s1cdmax);
+}
+
+static void arm_smmu_free_cd_tables(struct arm_smmu_domain *smmu_domain)
+{
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
+
+ arm_smmu_free_cd_leaf_table(smmu, &cfg->table, 1 << cfg->s1cdmax);
+}
+
/* Stream table manipulation functions */
static void
arm_smmu_write_strtab_l1_desc(__le64 *dst, struct arm_smmu_strtab_l1_desc *desc)
@@ -2145,11 +2188,7 @@ static void arm_smmu_domain_free(struct iommu_domain *domain)
struct arm_smmu_s1_cfg *cfg = &smmu_domain->s1_cfg;
if (cfg->table.ptr) {
- dmam_free_coherent(smmu_domain->smmu->dev,
- CTXDESC_CD_DWORDS << 3,
- cfg->table.ptr,
- cfg->table.ptr_dma);
-
+ arm_smmu_free_cd_tables(smmu_domain);
arm_smmu_bitmap_free(smmu->asid_map, cfg->cd.asid);
}
} else {
@@ -2173,13 +2212,9 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
if (asid < 0)
return asid;
- cfg->table.ptr = dmam_alloc_coherent(smmu->dev, CTXDESC_CD_DWORDS << 3,
- &cfg->table.ptr_dma, GFP_KERNEL);
- if (!cfg->table.ptr) {
- 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[0];
--
2.24.0
