Re: [PATCH V10 07/11] iommu/vt-d: Support flushing more translation cache types

[Jacob Pan <jacob.jun.pan@linux.intel.com>]

On Fri, 27 Mar 2020 15:46:23 +0100
Auger Eric <eric.auger@redhat.com> wrote:

> Hi Jacob,
> 
> On 3/21/20 12:27 AM, 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>
> > 
> > ---
> > v9 -> v10:
> > Fix off by 1 in pasid device iotlb flush
> > 
> > Address v7 missed review from Eric
> > 
> > ---
> > ---
> >  drivers/iommu/dmar.c        | 36
> > ++++++++++++++++++++++++++++++++++++ drivers/iommu/intel-pasid.c |
> > 3 ++- include/linux/intel-iommu.h | 20 ++++++++++++++++----
> >  3 files changed, 54 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
> > index f77dae7ba7d4..4d6b7b5b37ee 100644
> > --- a/drivers/iommu/dmar.c
> > +++ b/drivers/iommu/dmar.c
> > @@ -1421,6 +1421,42 @@ void qi_flush_piotlb(struct intel_iommu
> > *iommu, u16 did, u32 pasid, u64 addr, qi_submit_sync(&desc, iommu);
> >  }
> >  
> > +/* PASID-based device IOTLB Invalidate */
> > +void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid,
> > u16 pfsid,
> > +		u32 pasid,  u16 qdep, u64 addr, unsigned
> > size_order, u64 granu) +{
> > +	unsigned long mask = 1UL << (VTD_PAGE_SHIFT + size_order -
> > 1);
> > +	struct qi_desc desc = {.qw2 = 0, .qw3 = 0};
> > +
> > +	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.
> > +	 * size order = 0 is PAGE_SIZE 4KB
> > +	 * Max Invs Pending (MIP) is set to 0 for now until we
> > have DIT in
> > +	 * ECAP.
> > +	 */
> > +	desc.qw1 |= addr & ~mask;
> > +	if (size_order)
> > +		desc.qw1 |= 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 10c7856afc6b..9f6d07410722
> > 100644 --- a/drivers/iommu/intel-pasid.c
> > +++ b/drivers/iommu/intel-pasid.c
> > @@ -435,7 +435,8 @@ 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;  
> Just a nit, this fix is not documented in the commit message.
> 
Thanks, I just sent out this fix separately. Will remove this from the
set.
https://lkml.org/lkml/2020/3/30/1065

> Besides
> Reviewed-by: Eric Auger <eric.auger@redhat.com>
> 
> Thanks
> 
> Eric
> 
> >  	desc.qw1 = 0;
> >  	desc.qw2 = 0;
> >  	desc.qw3 = 0;
> > diff --git a/include/linux/intel-iommu.h
> > b/include/linux/intel-iommu.h index 85b05120940e..43539713b3b3
> > 100644 --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -334,7 +334,7 @@ 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)
> > @@ -353,16 +353,21 @@ 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)
> > @@ -662,8 +667,15 @@ extern void qi_flush_iotlb(struct intel_iommu
> > *iommu, u16 did, u64 addr, unsigned int size_order, u64 type);
> >  extern void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid,
> > u16 pfsid, u16 qdep, u64 addr, unsigned mask);
> > +
> >  void qi_flush_piotlb(struct intel_iommu *iommu, u16 did, u32
> > pasid, u64 addr, unsigned long npages, bool ih);
> > +
> > +extern void qi_flush_dev_iotlb_pasid(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);
> >   
> 

[Jacob Pan]
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