Re: [PATCH v7 06/11] iommu/vt-d: Avoid duplicated code for PASID setup

Lu Baolu
2019-10-25T05:35:37Z

Hi,

On 10/25/19 3:54 AM, Jacob Pan wrote:
> After each setup for PASID entry, related translation caches must be flushed.
> We can combine duplicated code into one function which is less error prone.
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>

This patch looks good to me.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>

Best regards,
baolu

> ---
> drivers/iommu/intel-pasid.c | 48 +++++++++++++++++----------------------------
> 1 file changed, 18 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
> index e79d680fe300..ffbd416ed3b8 100644
> --- a/drivers/iommu/intel-pasid.c
> +++ b/drivers/iommu/intel-pasid.c
> @@ -485,6 +485,21 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
> devtlb_invalidation_with_pasid(iommu, dev, pasid);
> }
>
> +static void pasid_flush_caches(struct intel_iommu *iommu,
> + struct pasid_entry *pte,
> + int pasid, u16 did)
> +{
> + if (!ecap_coherent(iommu->ecap))
> + clflush_cache_range(pte, sizeof(*pte));
> +
> + if (cap_caching_mode(iommu->cap)) {
> + pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> + iotlb_invalidation_with_pasid(iommu, did, pasid);
> + } else {
> + iommu_flush_write_buffer(iommu);
> + }
> +}
> +
> /*
> * Set up the scalable mode pasid table entry for first only
> * translation type.
> @@ -530,16 +545,7 @@ int intel_pasid_setup_first_level(struct intel_iommu *iommu,
> /* Setup Present and PASID Granular Transfer Type: */
> pasid_set_translation_type(pte, 1);
> pasid_set_present(pte);
> -
> - if (!ecap_coherent(iommu->ecap))
> - clflush_cache_range(pte, sizeof(*pte));
> -
> - if (cap_caching_mode(iommu->cap)) {
> - pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> - iotlb_invalidation_with_pasid(iommu, did, pasid);
> - } else {
> - iommu_flush_write_buffer(iommu);
> - }
> + pasid_flush_caches(iommu, pte, pasid, did);
>
> return 0;
> }
> @@ -603,16 +609,7 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
> */
> pasid_set_sre(pte);
> pasid_set_present(pte);
> -
> - if (!ecap_coherent(iommu->ecap))
> - clflush_cache_range(pte, sizeof(*pte));
> -
> - if (cap_caching_mode(iommu->cap)) {
> - pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> - iotlb_invalidation_with_pasid(iommu, did, pasid);
> - } else {
> - iommu_flush_write_buffer(iommu);
> - }
> + pasid_flush_caches(iommu, pte, pasid, did);
>
> return 0;
> }
> @@ -646,16 +643,7 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
> */
> pasid_set_sre(pte);
> pasid_set_present(pte);
> -
> - if (!ecap_coherent(iommu->ecap))
> - clflush_cache_range(pte, sizeof(*pte));
> -
> - if (cap_caching_mode(iommu->cap)) {
> - pasid_cache_invalidation_with_pasid(iommu, did, pasid);
> - iotlb_invalidation_with_pasid(iommu, did, pasid);
> - } else {
> - iommu_flush_write_buffer(iommu);
> - }
> + pasid_flush_caches(iommu, pte, pasid, did);
>
> return 0;
> }