Re: [Qemu-devel] [for-4.0 PATCH v3 1/9] pcie: Create enums for link speed and width

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 4/12/18 17:26, Alex Williamson wrote:
> In preparation for reporting higher virtual link speeds and widths,
> create enums and macros to help us manage them.
> 
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
> Tested-by: Geoffrey McRae <geoff@hostfission.com>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> ---
>  hw/pci/pcie.c              |    7 ++++---
>  hw/vfio/pci.c              |    3 ++-
>  include/hw/pci/pcie_regs.h |   23 +++++++++++++++++++++--
>  3 files changed, 27 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
> index 6c91bd44a0a5..914a5261a79b 100644
> --- a/hw/pci/pcie.c
> +++ b/hw/pci/pcie.c
> @@ -68,11 +68,12 @@ pcie_cap_v1_fill(PCIDevice *dev, uint8_t port, uint8_t type, uint8_t version)
>      pci_set_long(exp_cap + PCI_EXP_LNKCAP,
>                   (port << PCI_EXP_LNKCAP_PN_SHIFT) |
>                   PCI_EXP_LNKCAP_ASPMS_0S |
> -                 PCI_EXP_LNK_MLW_1 |
> -                 PCI_EXP_LNK_LS_25);
> +                 QEMU_PCI_EXP_LNKCAP_MLW(QEMU_PCI_EXP_LNK_X1) |
> +                 QEMU_PCI_EXP_LNKCAP_MLS(QEMU_PCI_EXP_LNK_2_5GT));
>  
>      pci_set_word(exp_cap + PCI_EXP_LNKSTA,
> -                 PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25);
> +                 QEMU_PCI_EXP_LNKSTA_NLW(QEMU_PCI_EXP_LNK_X1) |
> +                 QEMU_PCI_EXP_LNKSTA_CLS(QEMU_PCI_EXP_LNK_2_5GT));
>  
>      if (dev->cap_present & QEMU_PCIE_LNKSTA_DLLLA) {
>          pci_word_test_and_set_mask(exp_cap + PCI_EXP_LNKSTA,
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
> index 5c7bd9698496..74f9a46b4be0 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -1897,7 +1897,8 @@ static int vfio_setup_pcie_cap(VFIOPCIDevice *vdev, int pos, uint8_t size,
>                                     PCI_EXP_TYPE_ENDPOINT << 4,
>                                     PCI_EXP_FLAGS_TYPE);
>              vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP,
> -                                   PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25, ~0);
> +                           QEMU_PCI_EXP_LNKCAP_MLW(QEMU_PCI_EXP_LNK_X1) |
> +                           QEMU_PCI_EXP_LNKCAP_MLS(QEMU_PCI_EXP_LNK_2_5GT), ~0);
>              vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0);
>          }
>  
> diff --git a/include/hw/pci/pcie_regs.h b/include/hw/pci/pcie_regs.h
> index a95522a13b04..ad4e7808b8ac 100644
> --- a/include/hw/pci/pcie_regs.h
> +++ b/include/hw/pci/pcie_regs.h
> @@ -34,10 +34,29 @@
>  
>  /* PCI_EXP_LINK{CAP, STA} */
>  /* link speed */
> -#define PCI_EXP_LNK_LS_25               1
> +typedef enum PCIExpLinkSpeed {
> +    QEMU_PCI_EXP_LNK_2_5GT = 1,
> +    QEMU_PCI_EXP_LNK_5GT,
> +    QEMU_PCI_EXP_LNK_8GT,
> +    QEMU_PCI_EXP_LNK_16GT,
> +} PCIExpLinkSpeed;
> +
> +#define QEMU_PCI_EXP_LNKCAP_MLS(speed)  (speed)
> +#define QEMU_PCI_EXP_LNKSTA_CLS         QEMU_PCI_EXP_LNKCAP_MLS
> +
> +typedef enum PCIExpLinkWidth {
> +    QEMU_PCI_EXP_LNK_X1 = 1,
> +    QEMU_PCI_EXP_LNK_X2 = 2,
> +    QEMU_PCI_EXP_LNK_X4 = 4,
> +    QEMU_PCI_EXP_LNK_X8 = 8,
> +    QEMU_PCI_EXP_LNK_X12 = 12,
> +    QEMU_PCI_EXP_LNK_X16 = 16,
> +    QEMU_PCI_EXP_LNK_X32 = 32,
> +} PCIExpLinkWidth;
>  
>  #define PCI_EXP_LNK_MLW_SHIFT           ctz32(PCI_EXP_LNKCAP_MLW)
> -#define PCI_EXP_LNK_MLW_1               (1 << PCI_EXP_LNK_MLW_SHIFT)
> +#define QEMU_PCI_EXP_LNKCAP_MLW(width)  (width << PCI_EXP_LNK_MLW_SHIFT)
> +#define QEMU_PCI_EXP_LNKSTA_NLW         QEMU_PCI_EXP_LNKCAP_MLW
>  
>  /* PCI_EXP_LINKCAP */
>  #define PCI_EXP_LNKCAP_ASPMS_SHIFT      ctz32(PCI_EXP_LNKCAP_ASPMS)
> 
>