linux-kernel - Re: [PATCH v2 1/2] iommu/vt-d: add definitions for PFSID

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Date:   Wed, 20 Jun 2018 13:25:31 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     stable@...r.kernel.org, "Ashok Raj" <ashok.raj@...el.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v2 1/2] iommu/vt-d: add definitions for PFSID

Hi Joerg/David,

Any comments on this? I will rebase to 18-rc1.
Thanks,

Jacob

On Thu,  7 Jun 2018 09:56:59 -0700
Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:

> When SRIOV VF device IOTLB is invalidated, we need to provide
> the PF source ID such that IOMMU hardware can gauge the depth
> of invalidation queue which is shared among VFs. This is needed
> when device invalidation throttle (DIT) capability is supported.
> 
> This patch adds bit definitions for checking and tracking PFSID.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Cc: stable@...r.kernel.org
> Cc: "Ashok Raj" <ashok.raj@...el.com>
> Cc: "Lu Baolu" <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel-iommu.c | 1 +
>  include/linux/intel-iommu.h | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 749d8f2..3d77d61 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -422,6 +422,7 @@ struct device_domain_info {
>  	struct list_head global; /* link to global list */
>  	u8 bus;			/* PCI bus number */
>  	u8 devfn;		/* PCI devfn number */
> +	u16 pfsid;		/* SRIOV physical function source
> ID */ u8 pasid_supported:3;
>  	u8 pasid_enabled:1;
>  	u8 pri_supported:1;
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index ef169d6..af1c05f 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -114,6 +114,7 @@
>   * Extended Capability Register
>   */
>  
> +#define ecap_dit(e)		((e >> 41) & 0x1)
>  #define ecap_pasid(e)		((e >> 40) & 0x1)
>  #define ecap_pss(e)		((e >> 35) & 0x1f)
>  #define ecap_eafs(e)		((e >> 34) & 0x1)
> @@ -284,6 +285,7 @@ enum {
>  #define QI_DEV_IOTLB_SID(sid)	((u64)((sid) & 0xffff) << 32)
>  #define QI_DEV_IOTLB_QDEP(qdep)	(((qdep) & 0x1f) << 16)
>  #define QI_DEV_IOTLB_ADDR(addr)	((u64)(addr) & VTD_PAGE_MASK)
> +#define QI_DEV_IOTLB_PFSID(pfsid) (((u64)(pfsid & 0xf) << 12) |
> ((u64)(pfsid & 0xfff) << 52)) #define QI_DEV_IOTLB_SIZE	1
>  #define QI_DEV_IOTLB_MAX_INVS	32
>  
> @@ -308,6 +310,7 @@ enum {
>  #define QI_DEV_EIOTLB_PASID(p)	(((u64)p) << 32)
>  #define QI_DEV_EIOTLB_SID(sid)	((u64)((sid) & 0xffff) << 16)
>  #define QI_DEV_EIOTLB_QDEP(qd)	((u64)((qd) & 0x1f) << 4)
> +#define QI_DEV_EIOTLB_PFSID(pfsid) (((u64)(pfsid & 0xf) << 12) |
> ((u64)(pfsid & 0xfff) << 52)) #define QI_DEV_EIOTLB_MAX_INVS	32
>  
>  #define QI_PGRP_IDX(idx)	(((u64)(idx)) << 55)

[Jacob Pan]