From mboxrd@z Thu Jan 1 00:00:00 1970 From: lorenzo.pieralisi@arm.com (Lorenzo Pieralisi) Date: Tue, 20 Jun 2017 20:27:47 +0100 Subject: [PATCH v8 1/3] ACPI/IORT: Fixup SMMUv3 resource size for Cavium ThunderX2 SMMUv3 model In-Reply-To: <1497968259-16390-2-git-send-email-gakula@caviumnetworks.com> References: <1497968259-16390-1-git-send-email-gakula@caviumnetworks.com> <1497968259-16390-2-git-send-email-gakula@caviumnetworks.com> Message-ID: <20170620192747.GA30990@red-moon> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Jun 20, 2017 at 07:47:37PM +0530, Geetha sowjanya wrote: > From: Linu Cherian > > Cavium ThunderX2 implementation doesn't support second page in SMMU > register space. Hence, resource size is set as 64k for this model. > > Signed-off-by: Linu Cherian > Signed-off-by: Geetha Sowjanya > --- > drivers/acpi/arm64/iort.c | 15 ++++++++++++++- > 1 files changed, 14 insertions(+), 1 deletions(-) Acked-by: Lorenzo Pieralisi > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index c5fecf9..c166f3e 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -828,6 +828,18 @@ static int __init arm_smmu_v3_count_resources(struct acpi_iort_node *node) > return num_res; > } > > +static unsigned long arm_smmu_v3_resource_size(struct acpi_iort_smmu_v3 *smmu) > +{ > + /* > + * Override the size, for Cavium ThunderX2 implementation > + * which doesn't support the page 1 SMMU register space. > + */ > + if (smmu->model == ACPI_IORT_SMMU_V3_CAVIUM_CN99XX) > + return SZ_64K; > + > + return SZ_128K; > +} > + > static void __init arm_smmu_v3_init_resources(struct resource *res, > struct acpi_iort_node *node) > { > @@ -838,7 +850,8 @@ static void __init arm_smmu_v3_init_resources(struct resource *res, > smmu = (struct acpi_iort_smmu_v3 *)node->node_data; > > res[num_res].start = smmu->base_address; > - res[num_res].end = smmu->base_address + SZ_128K - 1; > + res[num_res].end = smmu->base_address + > + arm_smmu_v3_resource_size(smmu) - 1; > res[num_res].flags = IORESOURCE_MEM; > > num_res++; > -- > 1.7.1 >