linux-kernel - Re: [PATCH 07/10] ocxl: Save the device serial number in ocxl

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Message-Id: <11327e5f-bc88-620e-f119-495eb7d4b02f@linux.ibm.com>
Date:   Thu, 7 Nov 2019 19:18:59 +0100
From:   Frederic Barrat <fbarrat@...ux.ibm.com>
To:     "Alastair D'Silva" <alastair@....ibm.com>, alastair@...ilva.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Greg Kurz <groug@...d.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.com>,
        Michal Hocko <mhocko@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Wei Yang <richard.weiyang@...il.com>, Qian Cai <cai@....pw>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: Re: [PATCH 07/10] ocxl: Save the device serial number in ocxl_fn



Le 25/10/2019 à 06:47, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@...ilva.org>
> 
> This patch retrieves the serial number of the card and makes it available
> to consumers of the ocxl driver via the ocxl_fn struct.
> 
> Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> ---


Acked-by: Frederic Barrat <fbarrat@...ux.ibm.com>



>   drivers/misc/ocxl/config.c | 46 ++++++++++++++++++++++++++++++++++++++
>   include/misc/ocxl.h        |  1 +
>   2 files changed, 47 insertions(+)
> 
> diff --git a/drivers/misc/ocxl/config.c b/drivers/misc/ocxl/config.c
> index fb0c3b6f8312..a9203c309365 100644
> --- a/drivers/misc/ocxl/config.c
> +++ b/drivers/misc/ocxl/config.c
> @@ -71,6 +71,51 @@ static int find_dvsec_afu_ctrl(struct pci_dev *dev, u8 afu_idx)
>   	return 0;
>   }
>   
> +/**
> + * Find a related PCI device (function 0)
> + * @device: PCI device to match
> + *
> + * Returns a pointer to the related device, or null if not found
> + */
> +static struct pci_dev *get_function_0(struct pci_dev *dev)
> +{
> +	unsigned int devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0); // Look for function 0
> +
> +	return pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
> +					dev->bus->number, devfn);
> +}
> +
> +static void read_serial(struct pci_dev *dev, struct ocxl_fn_config *fn)
> +{
> +	u32 low, high;
> +	int pos;
> +
> +	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DSN);
> +	if (pos) {
> +		pci_read_config_dword(dev, pos + 0x04, &low);
> +		pci_read_config_dword(dev, pos + 0x08, &high);
> +
> +		fn->serial = low | ((u64)high) << 32;
> +
> +		return;
> +	}
> +
> +	if (PCI_FUNC(dev->devfn) != 0) {
> +		struct pci_dev *related = get_function_0(dev);
> +
> +		if (!related) {
> +			fn->serial = 0;
> +			return;
> +		}
> +
> +		read_serial(related, fn);
> +		pci_dev_put(related);
> +		return;
> +	}
> +
> +	fn->serial = 0;
> +}
> +
>   static void read_pasid(struct pci_dev *dev, struct ocxl_fn_config *fn)
>   {
>   	u16 val;
> @@ -208,6 +253,7 @@ int ocxl_config_read_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
>   	int rc;
>   
>   	read_pasid(dev, fn);
> +	read_serial(dev, fn);
>   
>   	rc = read_dvsec_tl(dev, fn);
>   	if (rc) {
> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index 6f7c02f0d5e3..9843051c3c5b 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -46,6 +46,7 @@ struct ocxl_fn_config {
>   	int dvsec_afu_info_pos; /* offset of the AFU information DVSEC */
>   	s8 max_pasid_log;
>   	s8 max_afu_index;
> +	u64 serial;
>   };
>   
>   enum ocxl_endian {
>