On 2020-11-23 20:36, Will Deacon wrote:
On Tue, Nov 17, 2020 at 08:00:40PM +0530, Sai Prakash Ranjan wrote:
Add a quirk IO_PGTABLE_QUIRK_ARM_OUTER_WBWA to override
the attributes set in TCR for the page table walker when
using system cache.
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
---
drivers/iommu/io-pgtable-arm.c | 10 ++++++++--
include/linux/io-pgtable.h | 4 ++++
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/io-pgtable-arm.c
b/drivers/iommu/io-pgtable-arm.c
index a7a9bc08dcd1..7c9ea9d7874a 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -761,7 +761,8 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg
*cfg, void *cookie)
if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
IO_PGTABLE_QUIRK_NON_STRICT |
- IO_PGTABLE_QUIRK_ARM_TTBR1))
+ IO_PGTABLE_QUIRK_ARM_TTBR1 |
+ IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
return NULL;
data = arm_lpae_alloc_pgtable(cfg);
@@ -773,10 +774,15 @@ arm_64_lpae_alloc_pgtable_s1(struct
io_pgtable_cfg *cfg, void *cookie)
tcr->sh = ARM_LPAE_TCR_SH_IS;
tcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
+ if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA)
+ goto out_free_data;
} else {
tcr->sh = ARM_LPAE_TCR_SH_OS;
tcr->irgn = ARM_LPAE_TCR_RGN_NC;
- tcr->orgn = ARM_LPAE_TCR_RGN_NC;
+ if (!(cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
+ tcr->orgn = ARM_LPAE_TCR_RGN_NC;
+ else
+ tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
}
tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1;
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index 4cde111e425b..a9a2c59fab37 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_OUTER_WBWA: Override the attributes set in
TCR for
+ * the page table walker when using system cache.
Please can you reword this to say:
"Override the outer-cacheability attributes set in the TCR for a
non-coherent
page-table walker."
Sure, thanks.
--
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