linux-kernel - Re: [PATCH v3 12/30] s390/pci: get SHM information from list pci

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Date:   Mon, 7 Feb 2022 11:08:18 +0100
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com, farman@...ux.ibm.com,
        borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
        vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com,
        thuth@...hat.com, pasic@...ux.ibm.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 12/30] s390/pci: get SHM information from list pci



On 2/4/22 22:15, Matthew Rosato wrote:
> KVM will need information on the special handle mask used to indicate
> emulated devices.  In order to obtain this, a new type of list pci call
> must be made to gather the information.  Extend clp_list_pci_req to
> also fetch the model-dependent-data field that holds this mask.
> 
> Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
>   arch/s390/include/asm/pci.h     |  1 +
>   arch/s390/include/asm/pci_clp.h |  2 +-
>   arch/s390/pci/pci_clp.c         | 25 ++++++++++++++++++++++---
>   3 files changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
> index 3c0b9986dcdc..e8a3fd5bc169 100644
> --- a/arch/s390/include/asm/pci.h
> +++ b/arch/s390/include/asm/pci.h
> @@ -227,6 +227,7 @@ int clp_enable_fh(struct zpci_dev *zdev, u32 *fh, u8 nr_dma_as);
>   int clp_disable_fh(struct zpci_dev *zdev, u32 *fh);
>   int clp_get_state(u32 fid, enum zpci_state *state);
>   int clp_refresh_fh(u32 fid, u32 *fh);
> +int zpci_get_mdd(u32 *mdd);
>   
>   /* UID */
>   void update_uid_checking(bool new);
> diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
> index d6189ed14f84..dc2041e97de4 100644
> --- a/arch/s390/include/asm/pci_clp.h
> +++ b/arch/s390/include/asm/pci_clp.h
> @@ -76,7 +76,7 @@ struct clp_req_list_pci {
>   struct clp_rsp_list_pci {
>   	struct clp_rsp_hdr hdr;
>   	u64 resume_token;
> -	u32 reserved2;
> +	u32 mdd;
>   	u16 max_fn;
>   	u8			: 7;
>   	u8 uid_checking		: 1;
> diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
> index dc733b58e74f..7477956be632 100644
> --- a/arch/s390/pci/pci_clp.c
> +++ b/arch/s390/pci/pci_clp.c
> @@ -328,7 +328,7 @@ int clp_disable_fh(struct zpci_dev *zdev, u32 *fh)
>   }
>   
>   static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
> -			    u64 *resume_token, int *nentries)
> +			    u64 *resume_token, int *nentries, u32 *mdd)
>   {
>   	int rc;
>   
> @@ -354,6 +354,8 @@ static int clp_list_pci_req(struct clp_req_rsp_list_pci *rrb,
>   	*nentries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
>   		rrb->response.entry_size;
>   	*resume_token = rrb->response.resume_token;
> +	if (mdd)
> +		*mdd = rrb->response.mdd;

mdd is a central value for ZPCI like zpci_unique_uid, I think both 
should be treated the same, i.e. belong to a central ZPCI structure or 
as today with zpci_unique_uid be global.
An aventage of the design is that the clp_list_pci_req signature does 
not need to be modified and we do not need extra clp call.

However I come here late with this demand so I guess this simplification 
can be done later.

Acked-by: Pierre Morel <pmorel@...ux.ibm.com>


>   
>   	return rc;
>   }
> @@ -365,7 +367,7 @@ static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
>   	int nentries, i, rc;
>   
>   	do {
> -		rc = clp_list_pci_req(rrb, &resume_token, &nentries);
> +		rc = clp_list_pci_req(rrb, &resume_token, &nentries, NULL);
>   		if (rc)
>   			return rc;
>   		for (i = 0; i < nentries; i++)
> @@ -383,7 +385,7 @@ static int clp_find_pci(struct clp_req_rsp_list_pci *rrb, u32 fid,
>   	int nentries, i, rc;
>   
>   	do {
> -		rc = clp_list_pci_req(rrb, &resume_token, &nentries);
> +		rc = clp_list_pci_req(rrb, &resume_token, &nentries, NULL);
>   		if (rc)
>   			return rc;
>   		fh_list = rrb->response.fh_list;
> @@ -468,6 +470,23 @@ int clp_get_state(u32 fid, enum zpci_state *state)
>   	return rc;
>   }
>   
> +int zpci_get_mdd(u32 *mdd)
> +{
> +	struct clp_req_rsp_list_pci *rrb;
> +	u64 resume_token = 0;
> +	int nentries, rc;
> +
> +	rrb = clp_alloc_block(GFP_KERNEL);
> +	if (!rrb)
> +		return -ENOMEM;
> +
> +	rc = clp_list_pci_req(rrb, &resume_token, &nentries, mdd);
> +
> +	clp_free_block(rrb);
> +	return rc;
> +}
> +EXPORT_SYMBOL_GPL(zpci_get_mdd);
> +
>   static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
>   {
>   	unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
> 

-- 
Pierre Morel
IBM Lab Boeblingen