[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] Re: [PATCH V6 20/32] pci: factor out the conversion logic f
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH V6 20/32] pci: factor out the conversion logic from io port address into pci device. |
Date: |
Tue, 3 Nov 2009 15:52:46 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Fri, Oct 30, 2009 at 09:21:14PM +0900, Isaku Yamahata wrote:
> factor out the logic which converts io port address into pci device
> and offset in PCI configuration space.
>
> Signed-off-by: Isaku Yamahata <address@hidden>
> ---
> hw/pci.c | 32 ++++++++++++++++++--------------
> 1 files changed, 18 insertions(+), 14 deletions(-)
>
> diff --git a/hw/pci.c b/hw/pci.c
> index 3e5780a..d0a96c6 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -663,24 +663,33 @@ void pci_default_write_config(PCIDevice *d, uint32_t
> addr, uint32_t val, int l)
> pci_update_mappings(d);
> }
>
> +static inline PCIDevice *pci_addr_to_dev(PCIBus *bus, uint32_t addr)
> +{
> + uint8_t bus_num = (addr >> 16) & 0xff;
> + uint8_t devfn = (addr >> 8) & 0xff;
> + return pci_find_device(bus, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
> +}
> +
To me XXX_to_XXX says "type conversion". Since this is really lookup
(that even can fail) pci_dev_find_by_addr() would be a better name IMO.
> +static inline int pci_addr_to_config(uint32_t addr)
> +{
> + return addr & (PCI_CONFIG_SPACE_SIZE - 1);
> +}
> +
The name is pretty confusing. This is probably clearer open-coded.
> void pci_data_write(void *opaque, uint32_t addr, uint32_t val, int len)
> {
> PCIBus *s = opaque;
> PCIDevice *pci_dev;
> - int config_addr, bus_num;
> + int config_addr;
>
> #if 0
> PCI_DPRINTF("pci_data_write: addr=%08x val=%08x len=%d\n",
> addr, val, len);
> #endif
> - bus_num = (addr >> 16) & 0xff;
> - s = pci_find_bus(s, bus_num);
> - if (!s)
> - return;
> - pci_dev = s->devices[(addr >> 8) & 0xff];
> + pci_dev = pci_addr_to_dev(s, addr);
> if (!pci_dev)
> return;
> config_addr = addr & 0xff;
> + config_addr = pci_addr_to_config(addr);
Did you mean to assign it twice?
> PCI_DPRINTF("pci_config_write: %s: addr=%02x val=%08x len=%d\n",
> pci_dev->name, config_addr, val, len);
> pci_dev->config_write(pci_dev, config_addr, val, len);
> @@ -690,16 +699,11 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int
> len)
> {
> PCIBus *s = opaque;
> PCIDevice *pci_dev;
> - int config_addr, bus_num;
> + int config_addr;
> uint32_t val;
>
> - bus_num = (addr >> 16) & 0xff;
> - s = pci_find_bus(s, bus_num);
> - if (!s)
> - goto fail;
> - pci_dev = s->devices[(addr >> 8) & 0xff];
> + pci_dev = pci_addr_to_dev(s, addr);
> if (!pci_dev) {
> - fail:
> switch(len) {
> case 1:
> val = 0xff;
> @@ -714,7 +718,7 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int
> len)
> }
> goto the_end;
> }
> - config_addr = addr & 0xff;
> + config_addr = pci_addr_to_config(addr);
> val = pci_dev->config_read(pci_dev, config_addr, len);
> PCI_DPRINTF("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
> pci_dev->name, config_addr, val, len);
> --
> 1.6.0.2
- [Qemu-devel] Re: [PATCH V6 20/32] pci: factor out the conversion logic from io port address into pci device.,
Michael S. Tsirkin <=