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

[Auger Eric <eric.auger@redhat.com>]

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.

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);
> 

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