The coherency integration of the IOMMU in the Mali-G52 found in the Amlogic G12B SoCs
is broken and leads to constant and random faults from the IOMMU.
Disabling shareability completely fixes the issue.
Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
---
drivers/iommu/io-pgtable-arm.c | 7 ++++---
include/linux/io-pgtable.h | 4 ++++
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index dc7bcf858b6d..d2d48dc86556 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -440,7 +440,9 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
}
- if (prot & IOMMU_CACHE)
+ if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_BROKEN_SH)
+ pte |= ARM_LPAE_PTE_SH_NS;
+ else if (prot & IOMMU_CACHE)
pte |= ARM_LPAE_PTE_SH_IS;
else
pte |= ARM_LPAE_PTE_SH_OS;
@@ -1005,8 +1007,7 @@ arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
{
struct arm_lpae_io_pgtable *data;
- /* No quirks for Mali (hopefully) */
- if (cfg->quirks)
+ if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_BROKEN_SH))
return NULL;
if (cfg->ias > 48 || cfg->oas > 40)
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index 23285ba645db..efb9c8f20909 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -86,6 +86,9 @@ struct io_pgtable_cfg {
*
* IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
* for use in the upper half of a split address space.
+ *
+ * IO_PGTABLE_QUIRK_ARM_BROKEN_SH: (ARM LPAE format) Disables shareability
+ * when coherency integration is broken.
*/
#define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
#define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
@@ -93,6 +96,7 @@ struct io_pgtable_cfg {
#define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
#define IO_PGTABLE_QUIRK_NON_STRICT BIT(4)
#define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5)
+ #define IO_PGTABLE_QUIRK_ARM_BROKEN_SH BIT(6)
unsigned long quirks;
unsigned long pgsize_bitmap;
unsigned int ias;
--
2.22.0
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