On 01/04/2019 20:11, Robin Murphy wrote:
On 01/04/2019 08:47, Rob Herring wrote:
ARM Mali midgard GPU is similar to standard 64-bit stage 1 page
tables, but
have a few differences. Add a new format type to represent the format.
The
input address size is 48-bits and the output address size is 40-bits (and
possibly less?). Note that the later bifrost GPUs follow the standard
64-bit stage 1 format.
The differences in the format compared to 64-bit stage 1 format are:
The 3rd level page entry bits are 0x1 instead of 0x3 for page entries.
The access flags are not read-only and unprivileged, but read and write.
This is similar to stage 2 entries, but the memory attributes field
matches
stage 1 being an index.
The nG bit is not set by the vendor driver. This one didn't seem to
matter,
but we'll keep it aligned to the vendor driver.
Cc: Will Deacon <will.dea...@arm.com>
Cc: Robin Murphy <robin.mur...@arm.com>
Cc: Joerg Roedel <j...@8bytes.org>
Cc: linux-arm-ker...@lists.infradead.org
Cc: iommu@lists.linux-foundation.org
Signed-off-by: Rob Herring <r...@kernel.org>
---
Please ack this as I need to apply it to the drm-misc tree. Or we need a
stable branch with this patch.
With the diff below squashed in to address my outstanding style nits,
Acked-by: Robin Murphy <robin.mur...@arm.com>
I don't foresee any conflicting io-pgtable changes to prevent this going
via DRM, but I'll leave the final say up to Joerg.
Urgh, sorry, turns out I flipped one condition too many there. On
reflection I may also forget my clever trick in future and inadvertently
break it, so it probably warrants a comment. Please supersede my
previous request with the (actually tested) diff below :)
Thanks,
Robin.
----->8-----
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 98551d0cff59..4f7be5a3e19b 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -197,12 +197,13 @@ struct arm_lpae_io_pgtable {
typedef u64 arm_lpae_iopte;
-static inline bool iopte_leaf(arm_lpae_iopte pte, int l, enum
io_pgtable_fmt fmt)
+static inline bool iopte_leaf(arm_lpae_iopte pte, int lvl,
+ enum io_pgtable_fmt fmt)
{
- if ((l == (ARM_LPAE_MAX_LEVELS - 1)) && (fmt != ARM_MALI_LPAE))
- return iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_PAGE;
+ if (lvl == (ARM_LPAE_MAX_LEVELS - 1) && fmt != ARM_MALI_LPAE)
+ return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_PAGE;
- return iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_BLOCK;
+ return iopte_type(pte, lvl) == ARM_LPAE_PTE_TYPE_BLOCK;
}
static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
@@ -310,12 +311,9 @@ static void __arm_lpae_init_pte(struct
arm_lpae_io_pgtable *data,
if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
pte |= ARM_LPAE_PTE_NS;
- if (lvl == ARM_LPAE_MAX_LEVELS - 1) {
- if (data->iop.fmt == ARM_MALI_LPAE)
- pte |= ARM_LPAE_PTE_TYPE_BLOCK;
- else
- pte |= ARM_LPAE_PTE_TYPE_PAGE;
- } else
+ if (data->iop.fmt != ARM_MALI_LPAE && lvl == ARM_LPAE_MAX_LEVELS - 1)
+ pte |= ARM_LPAE_PTE_TYPE_PAGE;
+ else
pte |= ARM_LPAE_PTE_TYPE_BLOCK;
if (data->iop.fmt != ARM_MALI_LPAE)
@@ -452,7 +450,10 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct
arm_lpae_io_pgtable *data,
if (prot & IOMMU_WRITE)
pte |= ARM_LPAE_PTE_HAP_WRITE;
}
-
+ /*
+ * Note that this logic is structured to accommodate Mali LPAE
+ * having stage-1-like attributes but stage-2-like permissions.
+ */
if (data->iop.fmt == ARM_64_LPAE_S2 ||
data->iop.fmt == ARM_32_LPAE_S2) {
if (prot & IOMMU_MMIO)
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
