| Message ID | 699f30cd6b3d69cebbefd0e73850694b9852c5da.1605621785.git.saiprakash.ranjan@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | System Cache support for GPU and required SMMU support | expand |
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@codeaurora.org> > --- > 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." Will
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@codeaurora.org> >> --- >> 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.
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. */ #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_OUTER_WBWA BIT(6) unsigned long quirks; unsigned long pgsize_bitmap; unsigned int ias;
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@codeaurora.org> --- drivers/iommu/io-pgtable-arm.c | 10 ++++++++-- include/linux/io-pgtable.h | 4 ++++ 2 files changed, 12 insertions(+), 2 deletions(-)