[RFC v2 1/4] iommu/io-pgtable-arm: flush TLBs when IO_PGTABLE_QUIRK_TLBI_ON_MAP

Eric Auger
2017-08-11T13:45:58Z

This patch implements the IO_PGTABLE_QUIRK_TLBI_ON_MAP quirk for
LPAE page tables. It forces TLB invalidations on map.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---
v1 -> v2:
- rebase on v4.13-rc2
---
drivers/iommu/io-pgtable-arm.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index b182039..198a042 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -447,6 +447,8 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
arm_lpae_iopte *ptep = data->pgd;
int ret, lvl = ARM_LPAE_START_LVL(data);
arm_lpae_iopte prot;
+ struct io_pgtable *iop = &data->iop;
+ struct io_pgtable_cfg *cfg = &data->iop.cfg;

/* If no access, then nothing to do */
if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
@@ -454,6 +456,12 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,

prot = arm_lpae_prot_to_pte(data, iommu_prot);
ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
+
+ if (cfg->quirks & IO_PGTABLE_QUIRK_TLBI_ON_MAP) {
+ io_pgtable_tlb_add_flush(iop, iova, size,
+ ARM_LPAE_GRANULE(data), false);
+ io_pgtable_tlb_sync(iop);
+ }
/*
* Synchronise all PTE updates for the new mapping before there's
* a chance for anything to kick off a table walk for the new iova.
@@ -739,7 +747,8 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
u64 reg;
struct arm_lpae_io_pgtable *data;

- if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA))
+ if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | IO_PGTABLE_QUIRK_NO_DMA |
+ IO_PGTABLE_QUIRK_TLBI_ON_MAP))
return NULL;

data = arm_lpae_alloc_pgtable(cfg);
@@ -828,7 +837,8 @@ arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
struct arm_lpae_io_pgtable *data;

/* The NS quirk doesn't apply at stage 2 */
- if (cfg->quirks & ~IO_PGTABLE_QUIRK_NO_DMA)
+ if (cfg->quirks &
+ ~(IO_PGTABLE_QUIRK_NO_DMA | IO_PGTABLE_QUIRK_TLBI_ON_MAP))
return NULL;

data = arm_lpae_alloc_pgtable(cfg);
--
2.5.5