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Kristensen" , Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Nov 11, 2020 at 11:32:42AM +0530, Sai Prakash Ranjan wrote: > On 2020-11-10 17:48, Will Deacon wrote: > > On Fri, Oct 30, 2020 at 02:53:08PM +0530, Sai Prakash Ranjan wrote: > > > Add a quirk IO_PGTABLE_QUIRK_SYS_CACHE to override the > > > attributes set in TCR for the page table walker when > > > using system cache. > > > > > > Signed-off-by: Sai Prakash Ranjan > > > --- > > > drivers/iommu/io-pgtable-arm.c | 7 ++++++- > > > include/linux/io-pgtable.h | 4 ++++ > > > 2 files changed, 10 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/iommu/io-pgtable-arm.c > > > b/drivers/iommu/io-pgtable-arm.c > > > index a7a9bc08dcd1..a356caf1683a 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_SYS_CACHE)) > > > return NULL; > > > > > > data = arm_lpae_alloc_pgtable(cfg); > > > @@ -773,6 +774,10 @@ 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; > > > + } else if (cfg->quirks & IO_PGTABLE_QUIRK_SYS_CACHE) { > > > + tcr->sh = ARM_LPAE_TCR_SH_OS; > > > + tcr->irgn = ARM_LPAE_TCR_RGN_NC; > > > + tcr->orgn = ARM_LPAE_TCR_RGN_WBWA; > > > > Given that this only applies in the case where then page-table walker is > > non-coherent, I think we'd be better off renaming the quirk to something > > like IO_PGTABLE_QUIRK_ARM_OUTER_WBWA and then rejecting it in the > > non-coherent case. > > > > Do you mean like below? > > diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c > index a7a9bc08dcd1..94de1f71db42 100644 > --- a/drivers/iommu/io-pgtable-arm.c > +++ b/drivers/iommu/io-pgtable-arm.c > @@ -776,7 +776,10 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg > *cfg, void *cookie) > } 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; Yes, but rejecting the quirk if the walker is coherent (I accidentally said "non-coherent" earlier on). Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel