[PATCH v5 08/09] iommu/ipmmu-vmsa: Allow two bit SL0
From: Magnus Damm
Date: Mon Oct 16 2017 - 08:32:47 EST
From: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
Introduce support for two bit SL0 bitfield in IMTTBCR
by using a separate feature flag.
Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
---
Changes since V4:
- Use leaf node mmu instead of root
Changes since V3:
- None
Changes since V2:
- None
Changes since V1:
- None
drivers/iommu/ipmmu-vmsa.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
--- 0019/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2017-10-16 20:24:22.990607110 +0900
@@ -40,6 +40,7 @@ struct ipmmu_features {
bool has_cache_leaf_nodes;
unsigned int number_of_contexts;
bool setup_imbuscr;
+ bool twobit_imttbcr_sl0;
};
struct ipmmu_vmsa_device {
@@ -144,6 +145,10 @@ static struct ipmmu_vmsa_iommu_priv *to_
#define IMTTBCR_TSZ0_MASK (7 << 0)
#define IMTTBCR_TSZ0_SHIFT O
+#define IMTTBCR_SL0_TWOBIT_LVL_3 (0 << 6)
+#define IMTTBCR_SL0_TWOBIT_LVL_2 (1 << 6)
+#define IMTTBCR_SL0_TWOBIT_LVL_1 (2 << 6)
+
#define IMBUSCR 0x000c
#define IMBUSCR_DVM (1 << 2)
#define IMBUSCR_BUSSEL_SYS (0 << 0)
@@ -396,6 +401,7 @@ static void ipmmu_domain_free_context(st
static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain)
{
u64 ttbr;
+ u32 tmp;
int ret;
/*
@@ -449,9 +455,14 @@ static int ipmmu_domain_init_context(str
* 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 |
- IMTTBCR_IRGN0_WB_WA | IMTTBCR_SL0_LVL_1);
+ IMTTBCR_IRGN0_WB_WA | tmp);
/* MAIR0 */
ipmmu_ctx_write_root(domain, IMMAIR0,
@@ -982,6 +993,7 @@ static const struct ipmmu_features ipmmu
.has_cache_leaf_nodes = false,
.number_of_contexts = 1, /* software only tested with one context */
.setup_imbuscr = true,
+ .twobit_imttbcr_sl0 = false,
};
static const struct of_device_id ipmmu_of_ids[] = {