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SubjectRe: [PATCH 4/5] iommu/vt-d: Consolidate pasid-based tlb invalidation
On Fri, 22 Nov 2019 11:04:48 +0800
Lu Baolu <baolu.lu@linux.intel.com> wrote:

> Merge pasid-based tlb invalidation into iommu->flush.p_iotlb_inv.
>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> ---
> drivers/iommu/intel-iommu.c | 43
> +++++++++++++++++++++++++++++++++++++ drivers/iommu/intel-pasid.c |
> 18 ++-------------- drivers/iommu/intel-svm.c | 23
> +++----------------- 3 files changed, 48 insertions(+), 36
> deletions(-)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 4eeb18942d3c..fec78cc877c1 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -3032,6 +3032,48 @@ qi_flush_dev_iotlb(struct intel_iommu *iommu,
> u16 sid, u16 pfsid, qi_submit_sync(&desc, iommu);
> }
>
> +/* PASID-based IOTLB invalidation */
> +static void
> +qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32 pasid, u64
> addr,
> + unsigned long npages, bool ih)
> +{
> + struct qi_desc desc = {.qw2 = 0, .qw3 = 0};
> +
> + /*
> + * npages == -1 means a PASID-selective invalidation,
> otherwise,
> + * a positive value for Page-selective-within-PASID
> invalidation.
> + * 0 is not a valid input.
> + */
> + if (WARN_ON(!npages)) {
> + pr_err("Invalid input npages = %ld\n", npages);
> + return;
> + }
> +
> + if (npages == -1) {
> + desc.qw0 = QI_EIOTLB_PASID(pasid) |
> + QI_EIOTLB_DID(did) |
> + QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) |
> + QI_EIOTLB_TYPE;
> + desc.qw1 = 0;
Is this based on the latest kernel? seems to be missing the recent
change for checking page selective cap. So I run into conflict.

+ /*
+ * Do PASID granu IOTLB invalidation if page selective
capability is
+ * not
available.
+
*/
+ if (pages == -1 || !cap_pgsel_inv(svm->iommu->cap))
{
+ desc.qw0 = QI_EIOTLB_PASID(svm->pasid)
|

Seems missing this one in your base?

Refs: v5.3-rc6-2-g8744daf4b069
Author: Jacob Pan <jacob.jun.pan@linux.intel.com>
AuthorDate: Mon Aug 26 08:53:29 2019 -0700
Commit: Joerg Roedel <jroedel@suse.de>
CommitDate: Tue Sep 3 15:01:27 2019 +0200

iommu/vt-d: Remove global page flush support

> + } else {
> + int mask = ilog2(__roundup_pow_of_two(npages));
> + unsigned long align = (1ULL << (VTD_PAGE_SHIFT +
> mask)); +
> + if (WARN_ON_ONCE(!ALIGN(addr, align)))
> + addr &= ~(align - 1);
> +
> + desc.qw0 = QI_EIOTLB_PASID(pasid) |
> + QI_EIOTLB_DID(did) |
> + QI_EIOTLB_GRAN(QI_GRAN_PSI_PASID) |
> + QI_EIOTLB_TYPE;
> + desc.qw1 = QI_EIOTLB_ADDR(addr) |
> + QI_EIOTLB_IH(ih) |
> + QI_EIOTLB_AM(mask);
> + }
> +
> + qi_submit_sync(&desc, iommu);
> +}
> +
> static void intel_iommu_init_qi(struct intel_iommu *iommu)
> {
> /*
> @@ -3065,6 +3107,7 @@ static void intel_iommu_init_qi(struct
> intel_iommu *iommu) iommu->flush.iotlb_inv = qi_flush_iotlb;
> iommu->flush.pc_inv = qi_flush_pasid;
> iommu->flush.dev_tlb_inv = qi_flush_dev_iotlb;
> + iommu->flush.p_iotlb_inv = qi_flush_piotlb;
> pr_info("%s: Using Queued invalidation\n",
> iommu->name); }
> }
> diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
> index 01dd9c86178b..78ff4eee8595 100644
> --- a/drivers/iommu/intel-pasid.c
> +++ b/drivers/iommu/intel-pasid.c
> @@ -359,20 +359,6 @@ pasid_set_flpm(struct pasid_entry *pe, u64 value)
> pasid_set_bits(&pe->val[2], GENMASK_ULL(3, 2), value << 2);
> }
>
> -static void
> -iotlb_invalidation_with_pasid(struct intel_iommu *iommu, u16 did,
> u32 pasid) -{
> - struct qi_desc desc;
> -
> - desc.qw0 = QI_EIOTLB_PASID(pasid) | QI_EIOTLB_DID(did) |
> - QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) |
> QI_EIOTLB_TYPE;
> - desc.qw1 = 0;
> - desc.qw2 = 0;
> - desc.qw3 = 0;
> -
> - qi_submit_sync(&desc, iommu);
> -}
> -
> static void
> devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
> struct device *dev, int pasid)
> @@ -409,7 +395,7 @@ void intel_pasid_tear_down_entry(struct
> intel_iommu *iommu, clflush_cache_range(pte, sizeof(*pte));
>
> iommu->flush.pc_inv(iommu, did, pasid, QI_PC_GRAN_PSWD);
> - iotlb_invalidation_with_pasid(iommu, did, pasid);
> + iommu->flush.p_iotlb_inv(iommu, did, pasid, 0, -1, 0);
>
> /* Device IOTLB doesn't need to be flushed in caching mode.
> */ if (!cap_caching_mode(iommu->cap))
> @@ -425,7 +411,7 @@ static void pasid_flush_caches(struct intel_iommu
> *iommu,
> if (cap_caching_mode(iommu->cap)) {
> iommu->flush.pc_inv(iommu, did, pasid,
> QI_PC_GRAN_PSWD);
> - iotlb_invalidation_with_pasid(iommu, did, pasid);
> + iommu->flush.p_iotlb_inv(iommu, did, pasid, 0, -1,
> 0); } else {
> iommu_flush_write_buffer(iommu);
> }
> diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
> index f5594b9981a5..02c6b14f0568 100644
> --- a/drivers/iommu/intel-svm.c
> +++ b/drivers/iommu/intel-svm.c
> @@ -118,27 +118,10 @@ static void intel_flush_svm_range_dev (struct
> intel_svm *svm, struct intel_svm_d unsigned long address, unsigned
> long pages, int ih) {
> struct qi_desc desc;
> + struct intel_iommu *iommu = svm->iommu;
>
> - if (pages == -1) {
> - desc.qw0 = QI_EIOTLB_PASID(svm->pasid) |
> - QI_EIOTLB_DID(sdev->did) |
> - QI_EIOTLB_GRAN(QI_GRAN_NONG_PASID) |
> - QI_EIOTLB_TYPE;
> - desc.qw1 = 0;
> - } else {
> - int mask = ilog2(__roundup_pow_of_two(pages));
> -
> - desc.qw0 = QI_EIOTLB_PASID(svm->pasid) |
> - QI_EIOTLB_DID(sdev->did) |
> - QI_EIOTLB_GRAN(QI_GRAN_PSI_PASID) |
> - QI_EIOTLB_TYPE;
> - desc.qw1 = QI_EIOTLB_ADDR(address) |
> - QI_EIOTLB_IH(ih) |
> - QI_EIOTLB_AM(mask);
> - }
> - desc.qw2 = 0;
> - desc.qw3 = 0;
> - qi_submit_sync(&desc, svm->iommu);
> + iommu->flush.p_iotlb_inv(iommu, sdev->did,
> + svm->pasid, address, pages, ih);
>
> if (sdev->dev_iotlb) {
> desc.qw0 = QI_DEV_EIOTLB_PASID(svm->pasid) |

[Jacob Pan]

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