Re: [Qemu-devel] [PATCH v2 18/21] q35: Fix irr initialization for slots 25..31

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

On Mon, Oct 08, 2012 at 11:30:37PM -0400, Jason Baron wrote:
> From: Isaku Yamahata <yamahata@valinux.co.jp>
> 
> This was totally off: The CC registers are 16 bit (stored as little
> endian), their offsets run in reverse order, and D26IR as well as D25IR
> have 4 bytes offset to their successors.
> 
> Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
> Signed-off-by: Jason Baron <jbaron@redhat.com>

Probably should be smashed into the original patch too?
More contained so less critical.

> ---
>  hw/q35.c |   29 ++++++++++++++++++++---------
>  1 files changed, 20 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/q35.c b/hw/q35.c
> index 5d256cb..e4f313e 100644
> --- a/hw/q35.c
> +++ b/hw/q35.c
> @@ -480,7 +480,7 @@ static void ich9_lpc_reset(DeviceState *qdev);
>   * Although it's not pci configuration space, it's little endian as Intel.
>   */
>  
> -static void ich9_cc_update_ir(uint8_t irr[PCI_NUM_PINS], uint32_t ir)
> +static void ich9_cc_update_ir(uint8_t irr[PCI_NUM_PINS], uint16_t ir)
>  {
>      int intx;
>      for (intx = 0; intx < PCI_NUM_PINS; intx++) {
> @@ -491,15 +491,26 @@ static void ich9_cc_update_ir(uint8_t irr[PCI_NUM_PINS], uint32_t ir)
>  static void ich9_cc_update(ICH9LPCState *lpc)
>  {
>      int slot;
> -    int reg_offset;
> -    int intx;
> +    int pci_intx;
> +
> +    const int reg_offsets[] = {
> +        ICH9_CC_D25IR,
> +        ICH9_CC_D26IR,
> +        ICH9_CC_D27IR,
> +        ICH9_CC_D28IR,
> +        ICH9_CC_D29IR,
> +        ICH9_CC_D30IR,
> +        ICH9_CC_D31IR,
> +    };
> +    const int *offset;
>  
>      /* D{25 - 31}IR, but D30IR is read only to 0. */
> -    for (slot = 25, reg_offset = 0; slot < 32; slot++, reg_offset++) {
> -        if (slot != 30) {
> -            ich9_cc_update_ir(lpc->irr[slot],
> -                              lpc->chip_config[ICH9_CC_D31IR + reg_offset]);
> +    for (slot = 25, offset = reg_offsets; slot < 32; slot++, offset++) {
> +        if (slot == 30) {
> +            continue;
>          }
> +        ich9_cc_update_ir(lpc->irr[slot],
> +                          pci_get_word(lpc->chip_config + *offset));
>      }
>  
>      /*
> @@ -508,8 +519,8 @@ static void ich9_cc_update(ICH9LPCState *lpc)
>       * are connected to pirq lines. Our choice is PIRQ[E-H].
>       * INT[A-D] are connected to PIRQ[E-H]
>       */
> -    for (intx = 0; intx < PCI_NUM_PINS; intx++) {
> -        lpc->irr[30][intx] = intx + 4;
> +    for (pci_intx = 0; pci_intx < PCI_NUM_PINS; pci_intx++) {
> +        lpc->irr[30][pci_intx] = pci_intx + 4;
>      }
>  }
>  
> -- 
> 1.7.1