Re: [Qemu-devel] [PATCH 4/8] tests: Better handle legacy IO addresses in tco-test

[Laurent Vivier <lvivier@redhat.com>]

On 18/10/2016 12:52, David Gibson wrote:
> tco_test uses the libqos PCI code to access the device.  This makes perfect
> sense for the PCI config space accesses.  However for IO, rather than the
> usual PCI approach of mapping a PCI BAR, then accessing that, it instead
> uses the legacy approach of fixed, known addresses in PCI IO space.
> 
> That doesn't work very well with the qpci_io_{read,write} functions because
> we never use qpci_iomap() and so have to make assumptions about the
> internal encoding of the address tokens iomap() returns.
> 
> This patch avoids that, by directly using the bus's pio_{read,write}
> callbacks, which are defined to take addresses within the PCI IO space.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  tests/tco-test.c | 87 ++++++++++++++++++++++++++++----------------------------
>  1 file changed, 44 insertions(+), 43 deletions(-)
> 
> diff --git a/tests/tco-test.c b/tests/tco-test.c
> index 0d201b1..e668630 100644
> --- a/tests/tco-test.c
> +++ b/tests/tco-test.c
> @@ -40,13 +40,13 @@ enum {
>  typedef struct {
>      const char *args;
>      bool noreboot;
> +    QPCIBus *bus;
>      QPCIDevice *dev;
> -    void *tco_io_base;
> +    uint16_t tco_io_base;
>  } TestData;
>  
>  static void test_init(TestData *d)
>  {
> -    QPCIBus *bus;
>      QTestState *qs;
>      char *s;
>  
> @@ -57,8 +57,8 @@ static void test_init(TestData *d)
>      qtest_irq_intercept_in(qs, "ioapic");
>      g_free(s);
>  
> -    bus = qpci_init_pc(NULL);
> -    d->dev = qpci_device_find(bus, QPCI_DEVFN(0x1f, 0x00));
> +    d->bus = qpci_init_pc(NULL);

You can use qtest_pc_boot() now.

> +    d->dev = qpci_device_find(d->bus, QPCI_DEVFN(0x1f, 0x00));
>      g_assert(d->dev != NULL);
>  
>      qpci_device_enable(d->dev);
> @@ -70,42 +70,42 @@ static void test_init(TestData *d)
>      /* set Root Complex BAR */
>      qpci_config_writel(d->dev, ICH9_LPC_RCBA, RCBA_BASE_ADDR | 0x1);
>  
> -    d->tco_io_base = (void *)((uintptr_t)PM_IO_BASE_ADDR + 0x60);
> +    d->tco_io_base = PM_IO_BASE_ADDR + 0x60;

Why don't you use QPCIBar in TestData to store the address?
And you can call qpci_io_XXX() with it.

Thanks,
Laurent