Re: [PATCH v7 10/11] iommu/vt-d: Support flushing more translation cache types

Auger Eric
2019-11-08T16:18:31Z

Hi Jacob,

On 10/24/19 9:55 PM, Jacob Pan wrote:
> When Shared Virtual Memory is exposed to a guest via vIOMMU, scalable
> IOTLB invalidation may be passed down from outside IOMMU subsystems.
> This patch adds invalidation functions that can be used for additional
> translation cache types.
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
> drivers/iommu/dmar.c | 46 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/iommu/intel-pasid.c | 3 ++-
> include/linux/intel-iommu.h | 21 +++++++++++++++++----
> 3 files changed, 65 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> index 49bb7d76e646..0ce2d32ff99e 100644
> --- a/drivers/iommu/dmar.c
> +++ b/drivers/iommu/dmar.c
> @@ -1346,6 +1346,20 @@ void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
> qi_submit_sync(&desc, iommu);
> }
>
> +/* PASID-based IOTLB Invalidate */
> +void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u64 addr, u32 pasid,
> + unsigned int size_order, u64 granu, int ih)
> +{
> + struct qi_desc desc = {.qw2 = 0, .qw3 = 0};
> +
> + desc.qw0 = QI_EIOTLB_PASID(pasid) | QI_EIOTLB_DID(did) |
> + QI_EIOTLB_GRAN(granu) | QI_EIOTLB_TYPE;
> + desc.qw1 = QI_EIOTLB_ADDR(addr) | QI_EIOTLB_IH(ih) |
> + QI_EIOTLB_AM(size_order);
> +
> + qi_submit_sync(&desc, iommu);
> +}
> +
> void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> u16 qdep, u64 addr, unsigned mask)
> {
> @@ -1369,6 +1383,38 @@ void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> qi_submit_sync(&desc, iommu);
> }
>
> +/* PASID-based device IOTLB Invalidate */
> +void qi_flush_dev_piotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> + u32 pasid, u16 qdep, u64 addr, unsigned size_order, u64 granu)
> +{
> + struct qi_desc desc;
> +
> + desc.qw0 = QI_DEV_EIOTLB_PASID(pasid) | QI_DEV_EIOTLB_SID(sid) |
> + QI_DEV_EIOTLB_QDEP(qdep) | QI_DEIOTLB_TYPE |
> + QI_DEV_IOTLB_PFSID(pfsid);
> + desc.qw1 = QI_DEV_EIOTLB_GLOB(granu);
> +
> + /* If S bit is 0, we only flush a single page. If S bit is set,
> + * The least significant zero bit indicates the invalidation address
> + * range. VT-d spec 6.5.2.6.
> + * e.g. address bit 12[0] indicates 8KB, 13[0] indicates 16KB.
> + */
> + if (!size_order) {
> + desc.qw0 |= QI_DEV_EIOTLB_ADDR(addr) & ~QI_DEV_EIOTLB_SIZE;
this is desc.qw1

With that fixed and the qi_flush_dev_piotlb init issue spotted by Lu,
feel free to add my

Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric

> + } else {
> + unsigned long mask = 1UL << (VTD_PAGE_SHIFT + size_order);
> + desc.qw1 |= QI_DEV_EIOTLB_ADDR(addr & ~mask) | QI_DEV_EIOTLB_SIZE;
> + }
> + qi_submit_sync(&desc, iommu);
> +}
> +
> +void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did, u64 granu, int pasid)
> +{
> + struct qi_desc desc = {.qw1 = 0, .qw2 = 0, .qw3 = 0};
> +
> + desc.qw0 = QI_PC_PASID(pasid) | QI_PC_DID(did) | QI_PC_GRAN(granu) | QI_PC_TYPE;
> + qi_submit_sync(&desc, iommu);
> +}
> /*
> * Disable Queued Invalidation interface.
> */
> diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
> index f846a907cfcf..6d7a701ef4d3 100644
> --- a/drivers/iommu/intel-pasid.c
> +++ b/drivers/iommu/intel-pasid.c
> @@ -491,7 +491,8 @@ pasid_cache_invalidation_with_pasid(struct intel_iommu *iommu,
> {
> struct qi_desc desc;
>
> - desc.qw0 = QI_PC_DID(did) | QI_PC_PASID_SEL | QI_PC_PASID(pasid);
> + desc.qw0 = QI_PC_DID(did) | QI_PC_GRAN(QI_PC_PASID_SEL) |
> + QI_PC_PASID(pasid) | QI_PC_TYPE;
> desc.qw1 = 0;
> desc.qw2 = 0;
> desc.qw3 = 0;
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index 6c74c71b1ebf..a25fb3a0ea5b 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -332,7 +332,7 @@ enum {
> #define QI_IOTLB_GRAN(gran) (((u64)gran) >> (DMA_TLB_FLUSH_GRANU_OFFSET-4))
> #define QI_IOTLB_ADDR(addr) (((u64)addr) & VTD_PAGE_MASK)
> #define QI_IOTLB_IH(ih) (((u64)ih) << 6)
> -#define QI_IOTLB_AM(am) (((u8)am))
> +#define QI_IOTLB_AM(am) (((u8)am) & 0x3f)
>
> #define QI_CC_FM(fm) (((u64)fm) << 48)
> #define QI_CC_SID(sid) (((u64)sid) << 32)
> @@ -350,16 +350,21 @@ enum {
> #define QI_PC_DID(did) (((u64)did) << 16)
> #define QI_PC_GRAN(gran) (((u64)gran) << 4)
>
> -#define QI_PC_ALL_PASIDS (QI_PC_TYPE | QI_PC_GRAN(0))
> -#define QI_PC_PASID_SEL (QI_PC_TYPE | QI_PC_GRAN(1))
> +/* PASID cache invalidation granu */
> +#define QI_PC_ALL_PASIDS 0
> +#define QI_PC_PASID_SEL 1
>
> #define QI_EIOTLB_ADDR(addr) ((u64)(addr) & VTD_PAGE_MASK)
> #define QI_EIOTLB_IH(ih) (((u64)ih) << 6)
> -#define QI_EIOTLB_AM(am) (((u64)am))
> +#define QI_EIOTLB_AM(am) (((u64)am) & 0x3f)
> #define QI_EIOTLB_PASID(pasid) (((u64)pasid) << 32)
> #define QI_EIOTLB_DID(did) (((u64)did) << 16)
> #define QI_EIOTLB_GRAN(gran) (((u64)gran) << 4)
>
> +/* QI Dev-IOTLB inv granu */
> +#define QI_DEV_IOTLB_GRAN_ALL 1
> +#define QI_DEV_IOTLB_GRAN_PASID_SEL 0
> +
> #define QI_DEV_EIOTLB_ADDR(a) ((u64)(a) & VTD_PAGE_MASK)
> #define QI_DEV_EIOTLB_SIZE (((u64)1) << 11)
> #define QI_DEV_EIOTLB_GLOB(g) ((u64)g)
> @@ -655,8 +660,16 @@ extern void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid,
> u8 fm, u64 type);
> extern void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
> unsigned int size_order, u64 type);
> +extern void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u64 addr,
> + u32 pasid, unsigned int size_order, u64 type, int ih);
> extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> u16 qdep, u64 addr, unsigned mask);
> +
> +extern void qi_flush_dev_piotlb(struct intel_iommu *iommu, u16 sid, u16 pfsid,
> + u32 pasid, u16 qdep, u64 addr, unsigned size_order, u64 granu);
> +
> +extern void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did, u64 granu, int pasid);
> +
> extern int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);
>
> extern int dmar_ir_support(void);
>