Re: [Xen-devel] [PATCH 13/14] PPC: e500: Map PIO space into core memory region

[Alexander Graf <agraf@xxxxxxx>]

On 08.10.2012, at 22:20, Scott Wood wrote:

> On 10/08/2012 07:23:52 AM, Alexander Graf wrote:
>> On PPC, we don't have PIO. So usually PIO space behind a PCI bridge is
>> accessible via MMIO. Do this mapping explicitly by mapping the PIO space
>> of our PCI bus into a memory region that lives in memory space.
>> Signed-off-by: Alexander Graf <agraf@xxxxxxx>
>> ---
>> hw/ppc/e500.c    |    3 +--
>> hw/ppce500_pci.c |    9 +++++++--
>> 2 files changed, 8 insertions(+), 4 deletions(-)
>> diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
>> index d23f9b2..857d4dc 100644
>> --- a/hw/ppc/e500.c
>> +++ b/hw/ppc/e500.c
>> @@ -52,7 +52,6 @@
>> #define MPC8544_PCI_REGS_BASE      (MPC8544_CCSRBAR_BASE + 0x8000ULL)
>> #define MPC8544_PCI_REGS_SIZE      0x1000ULL
>> #define MPC8544_PCI_IO             0xE1000000ULL
>> -#define MPC8544_PCI_IOLEN          0x10000ULL
>> #define MPC8544_UTIL_BASE          (MPC8544_CCSRBAR_BASE + 0xe0000ULL)
>> #define MPC8544_SPIN_BASE          0xEF000000ULL
>> @@ -511,7 +510,7 @@ void ppce500_init(PPCE500Params *params)
>>     if (!pci_bus)
>>         printf("couldn't create PCI controller!\n");
>> -    isa_mmio_init(MPC8544_PCI_IO, MPC8544_PCI_IOLEN);
>> +    sysbus_mmio_map(sysbus_from_qdev(dev), 1, MPC8544_PCI_IO);
>>     if (pci_bus) {
>>         /* Register network interfaces. */
>> diff --git a/hw/ppce500_pci.c b/hw/ppce500_pci.c
>> index 92b1dc0..27c6d7d 100644
>> --- a/hw/ppce500_pci.c
>> +++ b/hw/ppce500_pci.c
>> @@ -31,6 +31,8 @@
>> #define PCIE500_ALL_SIZE      0x1000
>> #define PCIE500_REG_SIZE      (PCIE500_ALL_SIZE - PCIE500_REG_BASE)
>> +#define PCIE500_PCI_IOLEN     0x10000ULL
> 
> I don't think this belongs in ppce500_pci.c -- it's board config (or rather, 
> a board-related default of something that is supposed to be software 
> configurable), just like the base address.

Actually this one is fixed in PCI. There are only 64k PIO ports.

> Any chance of similarly constraining PCI MMIO to its proper window?

We can't distinguish between inbound and outbound right now. If we only need to 
restrict CPU -> PCI access, then yes.


Alex


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