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pcihost: broadcast I/O requests to PCI-to-PCI bridges.

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This commit is contained in:
Maxim Poliakovski 2024-08-11 15:50:06 +02:00
parent dee7090071
commit f9338b8dd9
1 changed files with 17 additions and 0 deletions
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17
devices/common/pci/pcihost.cpp
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@ -168,11 +168,20 @@ bool PCIHost::pci_io_write_loop(uint32_t offset, int size, uint32_t value)
uint32_t PCIHost::pci_io_read_broadcast(uint32_t offset, int size)
{
uint32_t res;
// broadcast I/O request to devices that support I/O space
// until a device returns true that means "request accepted"
if (pci_io_read_loop (offset, size, res)) {
return res;
}
// broadcast I/O request to devices sitting behind PCI-to-PCI bridges
for (auto& dev : this->bridge_devs) {
if (dev->pci_io_read_loop(offset, size, res))
return res;
}
// no device has accepted the request -> report error
HWComponent *hwc = dynamic_cast<HWComponent*>(this);
LOG_F(
ERROR, "%s: Attempt to read from unmapped PCI I/O space @%08x.%c",
@ -190,6 +199,14 @@ void PCIHost::pci_io_write_broadcast(uint32_t offset, int size, uint32_t value)
if (pci_io_write_loop(offset, size, value)) {
return;
}
// broadcast I/O request to devices sitting behind PCI-to-PCI bridges
for (auto& dev : this->bridge_devs) {
if (dev->pci_io_write_loop(offset, size, value))
return;
}
// no device has accepted the request -> report error
HWComponent *hwc = dynamic_cast<HWComponent*>(this);
LOG_F(
ERROR, "%s: Attempt to write to unmapped PCI I/O space @%08x.%c = %0*x",