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SubjectRe: [PATCH v4 21/22] iommu/vt-d: Support flushing more translation cache types
On Thu, 18 Jul 2019 10:35:37 +0200
Auger Eric <eric.auger@redhat.com> wrote:

> Hi Jacob,
>
> On 6/9/19 3:44 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 | 50
> > +++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/intel-iommu.h | 21 +++++++++++++++---- 2 files
> > changed, 67 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> > index 6d969a1..0cda6fb 100644
> > --- a/drivers/iommu/dmar.c
> > +++ b/drivers/iommu/dmar.c
> > @@ -1357,6 +1357,21 @@ 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;
> nit: you could also init to {};
> > +
> > + 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);
> > + desc.qw2 = 0;
> > + desc.qw3 = 0;
> > + qi_submit_sync(&desc, iommu);
> > +}
> > +
> > void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16
> > pfsid, u16 qdep, u64 addr, unsigned mask)
> > {
> > @@ -1380,6 +1395,41 @@ 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, u64
> > granu)
> s/size/size_order
> > +{
> > + 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);
> maybe add a comment to remind MIP hint is sent to 0 as of now.
> > + 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 size. VT-d
> > spec
> > + * 6.5.2.6
> > + */
> > + if (!size)
> > + desc.qw0 |= QI_DEV_EIOTLB_ADDR(addr) &
> > ~QI_DEV_EIOTLB_SIZE;
> this is qw1.
my mistake.
> > + else {
> > + unsigned long mask = 1UL << (VTD_PAGE_SHIFT +
> > size);
> don't you miss a "- 1 " here?
your are right
> > +
> > + desc.qw1 |= QI_DEV_EIOTLB_ADDR(addr & ~mask) |
> > QI_DEV_EIOTLB_SIZE;
> desc.qw1 |= addr & ~mask | QI_DEV_EIOTLB_SIZE;
> ie. I don't think QI_DEV_EIOTLB_ADDR is useful here?
>
>
> So won't the following lines do the job?
>
> unsigned long mask = 1UL << (VTD_PAGE_SHIFT + size) -1;
> desc.qw1 |= addr & ~mask;
> if (size)
> desc.qw1 |= QI_DEV_EIOTLB_SIZE
that would work too, and simpler. thanks for the suggestion. will
change.
> > + }
> > + qi_submit_sync(&desc, iommu);
> > +}
> > +
> > +void qi_flush_pasid_cache(struct intel_iommu *iommu, u16 did, u64
> > granu, int pasid) +{
> > + struct qi_desc desc;
> > +
> > + desc.qw0 = QI_PC_TYPE | QI_PC_DID(did) | QI_PC_GRAN(granu)
> > | QI_PC_PASID(pasid);
> nit: reorder the fields according to the spec, easier to check if any
> is missing.
sounds good.

> > + desc.qw1 = 0;
> > + desc.qw2 = 0;
> > + desc.qw3 = 0;
> > + qi_submit_sync(&desc, iommu);
> > +}
> > /*
> > * Disable Queued Invalidation interface.
> > */
> > diff --git a/include/linux/intel-iommu.h
> > b/include/linux/intel-iommu.h index 94d3a9a..1cdb35b 100644
> > --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -339,7 +339,7 @@ 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)
> > @@ -357,17 +357,22 @@ 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_GL(gl) (((u64)gl) << 7)
> > #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)
> > @@ -658,8 +663,16 @@ 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, u64 granu);
> s/size/size_order
> > +
> > +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);
> >
>
> Thanks
>
> Eric

[Jacob Pan]

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