On Sun, 4 Oct 2020 01:45:49 +0000
Suravee Suthikulpanit <suravee.suthikulpa...@amd.com> wrote:
> Switch to using IO page table framework for AMD IOMMU v1 page table.
>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
One minor thing inline.
> ---
> drivers/iommu/amd/iommu.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index 77f44b927ae7..6f8316206fb8 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -32,6 +32,7 @@
> #include <linux/irqdomain.h>
> #include <linux/percpu.h>
> #include <linux/iova.h>
> +#include <linux/io-pgtable.h>
> #include <asm/irq_remapping.h>
> #include <asm/io_apic.h>
> #include <asm/apic.h>
> @@ -1573,6 +1574,22 @@ static int pdev_iommuv2_enable(struct pci_dev *pdev)
> return ret;
> }
>
> +struct io_pgtable_ops *
> +amd_iommu_setup_io_pgtable_ops(struct iommu_dev_data *dev_data,
> + struct protection_domain *domain)
> +{
> + struct amd_iommu *iommu = amd_iommu_rlookup_table[dev_data->devid];
> +
> + domain->iop.pgtbl_cfg = (struct io_pgtable_cfg) {
> + .pgsize_bitmap = AMD_IOMMU_PGSIZES,
> + .ias = IOMMU_IN_ADDR_BIT_SIZE,
> + .oas = IOMMU_OUT_ADDR_BIT_SIZE,
> + .iommu_dev = &iommu->dev->dev,
> + };
> +
> + return alloc_io_pgtable_ops(AMD_IOMMU_V1, &domain->iop.pgtbl_cfg,
> domain);
> +}
> +
> /*
> * If a device is not yet associated with a domain, this function makes the
> * device visible in the domain
> @@ -1580,6 +1597,7 @@ static int pdev_iommuv2_enable(struct pci_dev *pdev)
> static int attach_device(struct device *dev,
> struct protection_domain *domain)
> {
> + struct io_pgtable_ops *pgtbl_ops;
> struct iommu_dev_data *dev_data;
> struct pci_dev *pdev;
> unsigned long flags;
> @@ -1623,6 +1641,12 @@ static int attach_device(struct device *dev,
> skip_ats_check:
> ret = 0;
>
> + pgtbl_ops = amd_iommu_setup_io_pgtable_ops(dev_data, domain);
> + if (!pgtbl_ops) {
Perhaps cleaner to not store in a local variable if you aren't going to use it?
if (!amd_iommu_setup_io_pgtable_ops(dev_data, domain)) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> do_attach(dev_data, domain);
>
> /*
> @@ -1958,6 +1982,8 @@ static void amd_iommu_domain_free(struct iommu_domain
> *dom)
> if (domain->dev_cnt > 0)
> cleanup_domain(domain);
>
> + free_io_pgtable_ops(&domain->iop.iop.ops);
> +
> BUG_ON(domain->dev_cnt != 0);
>
> if (!dom)
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