| Message ID | 1484127714-3263-12-git-send-email-eric.auger@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 11.01.2017 10:41, Eric Auger wrote: > iommu/arm-smmu: Implement reserved region get/put callbacks > > The get() populates the list with the MSI IOVA reserved window. > > At the moment an arbitray MSI IOVA window is set at 0x8000000 > of size 1MB. This will allow to report those info in iommu-group > sysfs. > > Signed-off-by: Eric Auger <eric.auger@redhat.com> > Acked-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com> Thanks, Tomasz > > --- > > v7 -> v8: > - added Will's A-b > > v4: creation > --- > drivers/iommu/arm-smmu-v3.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > index 4d6ec44..6c4111c 100644 > --- a/drivers/iommu/arm-smmu-v3.c > +++ b/drivers/iommu/arm-smmu-v3.c > @@ -412,6 +412,9 @@ > /* High-level queue structures */ > #define ARM_SMMU_POLL_TIMEOUT_US 100 > > +#define MSI_IOVA_BASE 0x8000000 > +#define MSI_IOVA_LENGTH 0x100000 > + > static bool disable_bypass; > module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO); > MODULE_PARM_DESC(disable_bypass, > @@ -1883,6 +1886,29 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) > return iommu_fwspec_add_ids(dev, args->args, 1); > } > > +static void arm_smmu_get_resv_regions(struct device *dev, > + struct list_head *head) > +{ > + struct iommu_resv_region *region; > + int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; > + > + region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH, > + prot, IOMMU_RESV_MSI); > + if (!region) > + return; > + > + list_add_tail(®ion->list, head); > +} > + > +static void arm_smmu_put_resv_regions(struct device *dev, > + struct list_head *head) > +{ > + struct iommu_resv_region *entry, *next; > + > + list_for_each_entry_safe(entry, next, head, list) > + kfree(entry); > +} > + > static struct iommu_ops arm_smmu_ops = { > .capable = arm_smmu_capable, > .domain_alloc = arm_smmu_domain_alloc, > @@ -1898,6 +1924,8 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) > .domain_get_attr = arm_smmu_domain_get_attr, > .domain_set_attr = arm_smmu_domain_set_attr, > .of_xlate = arm_smmu_of_xlate, > + .get_resv_regions = arm_smmu_get_resv_regions, > + .put_resv_regions = arm_smmu_put_resv_regions, > .pgsize_bitmap = -1UL, /* Restricted during device attach */ > }; > >
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 4d6ec44..6c4111c 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -412,6 +412,9 @@ /* High-level queue structures */ #define ARM_SMMU_POLL_TIMEOUT_US 100 +#define MSI_IOVA_BASE 0x8000000 +#define MSI_IOVA_LENGTH 0x100000 + static bool disable_bypass; module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO); MODULE_PARM_DESC(disable_bypass, @@ -1883,6 +1886,29 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) return iommu_fwspec_add_ids(dev, args->args, 1); } +static void arm_smmu_get_resv_regions(struct device *dev, + struct list_head *head) +{ + struct iommu_resv_region *region; + int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO; + + region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH, + prot, IOMMU_RESV_MSI); + if (!region) + return; + + list_add_tail(®ion->list, head); +} + +static void arm_smmu_put_resv_regions(struct device *dev, + struct list_head *head) +{ + struct iommu_resv_region *entry, *next; + + list_for_each_entry_safe(entry, next, head, list) + kfree(entry); +} + static struct iommu_ops arm_smmu_ops = { .capable = arm_smmu_capable, .domain_alloc = arm_smmu_domain_alloc, @@ -1898,6 +1924,8 @@ static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) .domain_get_attr = arm_smmu_domain_get_attr, .domain_set_attr = arm_smmu_domain_set_attr, .of_xlate = arm_smmu_of_xlate, + .get_resv_regions = arm_smmu_get_resv_regions, + .put_resv_regions = arm_smmu_put_resv_regions, .pgsize_bitmap = -1UL, /* Restricted during device attach */ };