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[PATCHv10,1/9] iommu/io-pgtable: Add a domain attribute for pagetable configuration

Message ID 9190aa16f378fc0a7f8e57b2b9f60b033e7eeb4f.1606287059.git.saiprakash.ranjan@codeaurora.org (mailing list archive)
State New, archived
Headers show
Series System Cache support for GPU and required SMMU support | expand

Commit Message

Sai Prakash Ranjan Nov. 25, 2020, 7 a.m. UTC
Add a new iommu domain attribute DOMAIN_ATTR_IO_PGTABLE_CFG
for pagetable configuration which initially will be used to
set quirks like for system cache aka last level cache to be
used by client drivers like GPU to set right attributes for
caching the hardware pagetables into the system cache and
later can be extended to include other page table configuration
data.

Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
---
 include/linux/io-pgtable.h | 4 ++++
 include/linux/iommu.h      | 1 +
 2 files changed, 5 insertions(+)
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Patch

diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index 4cde111e425b..215fd9d69540 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -208,6 +208,10 @@  struct io_pgtable {
 
 #define io_pgtable_ops_to_pgtable(x) container_of((x), struct io_pgtable, ops)
 
+struct io_pgtable_domain_attr {
+	unsigned long quirks;
+};
+
 static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop)
 {
 	iop->cfg.tlb->tlb_flush_all(iop->cookie);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index b95a6f8db6ff..ffaa389ea128 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -118,6 +118,7 @@  enum iommu_attr {
 	DOMAIN_ATTR_FSL_PAMUV1,
 	DOMAIN_ATTR_NESTING,	/* two stages of translation */
 	DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
+	DOMAIN_ATTR_IO_PGTABLE_CFG,
 	DOMAIN_ATTR_MAX,
 };