From: Magnus Damm <damm+rene...@opensource.se>
Hack up the IPMMU driver to enable VM64 mode with 32-bit IOVA.
For this configuration the IPMMU hardware is configured with IMTTBCR.SL=1
and TSZ0 bits set to 0x20. This will enable a 32-bit IOVA space and use
"Initial lookup level 1" (in Table D4-13 of armv8_arm.pdf) also known as
"Start at first level" in IPMMU documentation.
Not for upstream merge. Tested on ULCB with r8a7796 ES1.0.
Earlier version posted as:
[PATCH/RFC] iommu/ipmmu-vmsa: Initial R-Car Gen3 VA64 mode support
The SL bit position has since then been updated to match more recent
IPMMU hardware documentation.
Not-Yet-Signed-off-by: Magnus Damm <damm+rene...@opensource.se>
---
drivers/iommu/ipmmu-vmsa.c | 36 +++++++++++++++++++++++++-----------
1 files changed, 25 insertions(+), 11 deletions(-)
--- 0009/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2017-11-17 13:17:33.510607110 +0900
@@ -42,6 +42,7 @@ struct ipmmu_features {
unsigned int number_of_contexts;
bool setup_imbuscr;
bool twobit_imttbcr_sl0;
+ bool imctr_va64;
};
struct ipmmu_vmsa_device {
@@ -97,6 +98,7 @@ static struct ipmmu_vmsa_iommu_priv *to_
#define IM_CTX_SIZE 0x40
#define IMCTR 0x0000
+#define IMCTR_VA64 (1 << 29)
#define IMCTR_TRE (1 << 17)
#define IMCTR_AFE (1 << 16)
#define IMCTR_RTSEL_MASK (3 << 4)
@@ -442,8 +444,9 @@ static int ipmmu_domain_init_context(str
domain->context_id = ret;
- domain->iop = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &domain->cfg,
- domain);
+ domain->iop = alloc_io_pgtable_ops(domain->mmu->features->imctr_va64 ?
+ ARM_64_LPAE_S1 : ARM_32_LPAE_S1,
+ &domain->cfg, domain);
if (!domain->iop) {
ipmmu_domain_free_context(domain->mmu->root,
domain->context_id);
@@ -456,14 +459,22 @@ static int ipmmu_domain_init_context(str
ipmmu_ctx_write_root(domain, IMTTUBR0, ttbr >> 32);
/*
- * TTBCR
- * We use long descriptors with inner-shareable WBWA tables and allocate
- * the whole 32-bit VA space to TTBR0.
- */
- if (domain->mmu->features->twobit_imttbcr_sl0)
- tmp = IMTTBCR_SL0_TWOBIT_LVL_1;
- else
- tmp = IMTTBCR_SL0_LVL_1;
+ * For IMCTR_VA64 and ARM_64_LPAE_S1 we need lowest bits of TTBCR
+ */
+ if (domain->mmu->features->imctr_va64) {
+ tmp = (1 << 6) | 0x20;
+ } else {
+ /*
+ * TTBCR
+ * We use long descriptors with inner-shareable WBWA tables
+ * and allocate the whole 32-bit VA space to TTBR0.
+ */
+
+ if (domain->mmu->features->twobit_imttbcr_sl0)
+ tmp = IMTTBCR_SL0_TWOBIT_LVL_1;
+ else
+ tmp = IMTTBCR_SL0_LVL_1;
+ }
ipmmu_ctx_write_root(domain, IMTTBCR, IMTTBCR_EAE |
IMTTBCR_SH0_INNER_SHAREABLE | IMTTBCR_ORGN0_WB_WA |
@@ -493,7 +504,8 @@ static int ipmmu_domain_init_context(str
* required when modifying the context registers.
*/
ipmmu_ctx_write_all(domain, IMCTR,
- IMCTR_INTEN | IMCTR_FLUSH | IMCTR_MMUEN);
+ (domain->mmu->features->imctr_va64 ? IMCTR_VA64 : 0)
+ | IMCTR_INTEN | IMCTR_FLUSH | IMCTR_MMUEN);
return 0;
}
@@ -1018,6 +1030,7 @@ static const struct ipmmu_features ipmmu
.number_of_contexts = 1, /* software only tested with one context */
.setup_imbuscr = true,
.twobit_imttbcr_sl0 = false,
+ .imctr_va64 = false,
};
static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
@@ -1026,6 +1039,7 @@ static const struct ipmmu_features ipmmu
.number_of_contexts = 8,
.setup_imbuscr = false,
.twobit_imttbcr_sl0 = true,
+ .imctr_va64 = true,
};
static const struct of_device_id ipmmu_of_ids[] = {
