Re: [PATCH v2 4/7] arm/acpi: fix PCI _PRT definition

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

On Mon, Feb 03, 2020 at 08:15:02AM +0800, Heyi Guo wrote:
> The address field in each _PRT mapping package should be constructed
> with high word for device# and low word for function#, so it is wrong
> to use bus_no as the high word. Enumerate all possible slots
> (i.e. PCI_SLOT_MAX) instead.
> 
> Signed-off-by: Heyi Guo <guoheyi@huawei.com>


Absolutely matches the spec so

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

To add to the commit message:
The existing code adds a bunch useless entries with device #s above 31.


> ---
> Cc: Peter Maydell <peter.maydell@linaro.org>
> Cc: "Michael S. Tsirkin" <mst@redhat.com>
> Cc: Igor Mammedov <imammedo@redhat.com>
> Cc: Shannon Zhao <shannon.zhaosl@gmail.com>
> Cc: qemu-arm@nongnu.org
> Cc: qemu-devel@nongnu.org
> ---
>  hw/arm/virt-acpi-build.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index be752c0ad8..5d157a9dd5 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -151,7 +151,7 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
>  {
>      int ecam_id = VIRT_ECAM_ID(highmem_ecam);
>      Aml *method, *crs, *ifctx, *UUID, *ifctx1, *elsectx, *buf;
> -    int i, bus_no;
> +    int i, slot_no;
>      hwaddr base_mmio = memmap[VIRT_PCIE_MMIO].base;
>      hwaddr size_mmio = memmap[VIRT_PCIE_MMIO].size;
>      hwaddr base_pio = memmap[VIRT_PCIE_PIO].base;
> @@ -170,12 +170,12 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
>      aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
>  
>      /* Declare the PCI Routing Table. */
> -    Aml *rt_pkg = aml_varpackage(nr_pcie_buses * PCI_NUM_PINS);
> -    for (bus_no = 0; bus_no < nr_pcie_buses; bus_no++) {
> +    Aml *rt_pkg = aml_varpackage(PCI_SLOT_MAX * PCI_NUM_PINS);
> +    for (slot_no = 0; slot_no < PCI_SLOT_MAX; slot_no++) {
>          for (i = 0; i < PCI_NUM_PINS; i++) {
> -            int gsi = (i + bus_no) % PCI_NUM_PINS;
> +            int gsi = (i + slot_no) % PCI_NUM_PINS;
>              Aml *pkg = aml_package(4);
> -            aml_append(pkg, aml_int((bus_no << 16) | 0xFFFF));
> +            aml_append(pkg, aml_int((slot_no << 16) | 0xFFFF));
>              aml_append(pkg, aml_int(i));
>              aml_append(pkg, aml_name("GSI%d", gsi));
>              aml_append(pkg, aml_int(0));
> -- 
> 2.19.1