On Thu, 18 Jul 2019 10:35:37 +0200 Auger Eric <[email protected]> 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 <[email protected]> > > --- > > 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]
