[Qemu-devel] Re: [PATCH 7/9] eepro100: Set power management capability using pci_reserve_capability

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Apr 06, 2010 at 01:44:07PM +0200, Stefan Weil wrote:
> pci_reserve_capability automatically updates PCI status and
> PCI capability pointer, so use it.
> 
> Signed-off-by: Stefan Weil <weil@mail.berlios.de>
> ---
>  hw/eepro100.c |   39 ++++++++++++++++++---------------------
>  1 files changed, 18 insertions(+), 21 deletions(-)
> 
> diff --git a/hw/eepro100.c b/hw/eepro100.c
> index e12ee23..f0acdbc 100644
> --- a/hw/eepro100.c
> +++ b/hw/eepro100.c
> @@ -457,7 +457,6 @@ static void eepro100_fcp_interrupt(EEPRO100State * s)
>  
>  static void e100_pci_reset(EEPRO100State * s, E100PCIDeviceInfo *e100_device)
>  {
> -    /* TODO: Use pci_add_capability(&s->dev, PCI_CAP_ID_PM, ...) for PM. */
>      uint32_t device = s->device;
>      uint8_t *pci_conf = s->dev.config;
>  
> @@ -468,25 +467,14 @@ static void e100_pci_reset(EEPRO100State * s, E100PCIDeviceInfo *e100_device)
>      /* PCI Device ID */
>      pci_config_set_device_id(pci_conf, e100_device->device_id);
>      /* PCI Status */
> -    if (e100_device->power_management) {
> -        pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_DEVSEL_MEDIUM |
> -                                            PCI_STATUS_FAST_BACK |
> -                                            PCI_STATUS_CAP_LIST);
> -    } else {
> -        pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_DEVSEL_MEDIUM |
> -                                            PCI_STATUS_FAST_BACK);
> -    }
> +    pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_DEVSEL_MEDIUM |
> +                                        PCI_STATUS_FAST_BACK);
>      /* PCI Revision ID */
>      pci_config_set_revision(pci_conf, e100_device->revision);
>      pci_config_set_class(pci_conf, PCI_CLASS_NETWORK_ETHERNET);
>      /* PCI Latency Timer */
>      pci_set_byte(pci_conf + PCI_LATENCY_TIMER, 0x20);   /* latency timer = 32 clocks */
> -    /* Capability Pointer */
> -    if (e100_device->power_management) {
> -        pci_set_byte(pci_conf + PCI_CAPABILITY_LIST, 0xdc);
> -    } else {
> -        pci_set_byte(pci_conf + PCI_CAPABILITY_LIST, 0x00);
> -    }
> +    /* Capability Pointer is set by PCI framework. */
>      /* Minimum Grant */
>      pci_set_byte(pci_conf + PCI_MIN_GNT, 0x08);
>      /* Maximum Latency */
> @@ -549,12 +537,21 @@ static void e100_pci_reset(EEPRO100State * s, E100PCIDeviceInfo *e100_device)
>  
>      if (e100_device->power_management) {
>          /* Power Management Capabilities */
> -        pci_set_byte(pci_conf + 0xdc, PCI_CAP_ID_PM);
> -        /* Next Item Pointer */
> -        /* Capability ID */
> -        pci_set_word(pci_conf + 0xde, 0x7e21);
> -        /* TODO: Power Management Control / Status. */
> -        /* TODO: Ethernet Power Consumption Registers (i82559 and later). */
> +        int cfg_offset;
> +        pci_reserve_capability(&s->dev, PCI_CONFIG_HEADER_SIZE,
> +                               0xdc - PCI_CONFIG_HEADER_SIZE);
> +        cfg_offset = pci_add_capability(&s->dev, PCI_CAP_ID_PM, PCI_PM_SIZEOF);

So this works. Long term, I think I should just extend pci_add_capability
with an offset parameter.

> +        assert(cfg_offset == 0xdc);
> +        if (cfg_offset > 0) {
> +            /* Power Management Capabilities */
> +            pci_set_word(pci_conf + cfg_offset + PCI_PM_PMC, 0x7e21);
> +#if 0 /* TODO: replace dummy code for power management emulation. */
> +            /* TODO: Power Management Control / Status. */
> +            pci_set_word(pci_conf + cfg_offset + PCI_PM_CTRL, 0x0000);
> +            /* TODO: Ethernet Power Consumption Registers (i82559 and later). */
> +            pci_set_byte(pci_conf + cfg_offset + PCI_PM_PPB_EXTENSIONS, 0x0000);
> +#endif
> +        }
>      }
>  
>  #if EEPROM_SIZE > 0
> -- 
> 1.7.0