linux-kernel - Re: [PATCH] PCI: move cfg space size (256/4096) macros to pci

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Message-ID: <tencent_1B35162D751A41943FDD0AE1@qq.com>
Date:   Sat, 12 Nov 2016 09:25:25 +0800
From:   "Wang Sheng-Hui" <shhuiw@...mail.com>
To:     "Bjorn Helgaas" <helgaas@...nel.org>
Cc:     "yu.zhao" <yu.zhao@...el.com>,
        "jbarnes" <jbarnes@...tuousgeek.org>,
        "alex.williamson" <alex.williamson@...hat.com>,
        "bhelgaas" <bhelgaas@...gle.com>,
        "linux-pci" <linux-pci@...r.kernel.org>,
        "kvm" <kvm@...r.kernel.org>,
        "linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re:  [PATCH] PCI: move cfg space size (256/4096) macros to pci_regs.h

Thanks!

Regards,
Wang Sheng-Hui


------------------ Original ------------------
From:  "Bjorn Helgaas";<helgaas@...nel.org>;
Date:  Sat, Nov 12, 2016 04:51 AM
To:  "Wang Sheng-Hui"<shhuiw@...mail.com>; 
Cc:  "yu.zhao"<yu.zhao@...el.com>; "jbarnes"<jbarnes@...tuousgeek.org>; "alex.williamson"<alex.williamson@...hat.com>; "bhelgaas"<bhelgaas@...gle.com>; "linux-pci"<linux-pci@...r.kernel.org>; "kvm"<kvm@...r.kernel.org>; "linux-kernel"<linux-kernel@...r.kernel.org>; 
Subject:  Re: [PATCH] PCI: move cfg space size (256/4096) macros to pci_regs.h



On Thu, Sep 22, 2016 at 09:05:46AM +0800, Wang Sheng-Hui wrote:
> This is a cleanup that moves PCI configuration space size
> macros (PCI_CFG_SPACE_SIZE and PCI_CFG_SPACE_EXP_SIZE) from
> drivers/pci/pci.h to include/uapi/linux/pci_regs.h
> 
> So that the macros can be used by more drivers and eliminate
> potential duplicate definition.
> 
> Signed-off-by: Wang Sheng-Hui <shhuiw@...mail.com>

Applied to pci/misc for v4.10, thanks!

I updated the comment to include PCI-X details, since the extended config
space applies to PCI-X Mode 2 devices as well as to PCIe devices:

+ * Conventional PCI and PCI-X Mode 1 devices have 256 bytes of
+ * configuration space.  PCI-X Mode 2 and PCIe devices have 4096 bytes of
+ * configuration space.

> ---
>  drivers/pci/pci.h                  | 3 ---
>  drivers/vfio/pci/vfio_pci_config.c | 2 --
>  include/uapi/linux/pci_regs.h      | 7 +++++++
>  3 files changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 9730c47..12d651a 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -1,9 +1,6 @@
>  #ifndef DRIVERS_PCI_H
>  #define DRIVERS_PCI_H
>  
> -#define PCI_CFG_SPACE_SIZE 256
> -#define PCI_CFG_SPACE_EXP_SIZE 4096
> -
>  #define PCI_FIND_CAP_TTL 48
>  
>  extern const unsigned char pcie_link_speed[];
> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> index 688691d..8dc8a5a 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -31,8 +31,6 @@
>  
>  #include "vfio_pci_private.h"
>  
> -#define PCI_CFG_SPACE_SIZE 256
> -
>  /* Fake capability ID for standard config space */
>  #define PCI_CAP_ID_BASIC 0
>  
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index 4040951..a07c53c 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -23,6 +23,13 @@
>  #define LINUX_PCI_REGS_H
>  
>  /*
> + * Under PCI, each device has 256 bytes of configuration address space.
> + * Under PCIe, each device has 4096 bytes of configuration address space.
> + */
> +#define PCI_CFG_SPACE_SIZE 256
> +#define PCI_CFG_SPACE_EXP_SIZE 4096
> +
> +/*
>   * Under PCI, each device has 256 bytes of configuration address space,
>   * of which the first 64 bytes are standardized as follows:
>   */
> -- 
> 2.7.4
> 
> 
> 
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