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pci_decode: export prefetchable attribute of BARs

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Memory descriptors in PCI BARs have a prefetchable bit, which can
be used to optimize memory access when setting, e.g. write-combined
in page-table entries.

Ref genodelabs/genode#4578
This commit is contained in:
Stefan Kalkowski
2022-09-28 13:56:17 +02:00
committed by Christian Helmuth
parent 1d0b9ed302
commit 7334128a2e
2 changed files with 10 additions and 2 deletions
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7
repos/os/include/pci/config.h
View File

@@ -96,6 +96,8 @@ struct Pci::Config : Genode::Mmio
enum { SIZE_32BIT = 0, SIZE_64BIT = 2 }; enum { SIZE_32BIT = 0, SIZE_64BIT = 2 };
}; };
struct Memory_prefetchable : Bitfield<3,1> {};
struct Io_base : Bitfield<2, 30> {}; struct Io_base : Bitfield<2, 30> {};
struct Memory_base : Bitfield<7, 25> {}; struct Memory_base : Bitfield<7, 25> {};
}; };
@@ -123,6 +125,9 @@ struct Pci::Config : Genode::Mmio
Bar_32bit::Memory_type::SIZE_64BIT; Bar_32bit::Memory_type::SIZE_64BIT;
} }
bool prefetchable() {
return Bar_32bit::Memory_prefetchable::get(_conf); }
Genode::size_t size() Genode::size_t size()
{ {
return 1 + (memory() ? ~Bar_32bit::Memory_base::masked(_conf) return 1 + (memory() ? ~Bar_32bit::Memory_base::masked(_conf)
@@ -524,7 +529,7 @@ struct Pci::Config : Genode::Mmio
if (!reg0.valid()) if (!reg0.valid())
continue; continue;
if (reg0.memory()) { if (reg0.memory()) {
memory(reg0.addr(), reg0.size(), i); memory(reg0.addr(), reg0.size(), i, reg0.prefetchable());
if (reg0.bit64()) i++; if (reg0.bit64()) i++;
} else } else
io(reg0.addr(), reg0.size(), i); io(reg0.addr(), reg0.size(), i);

5
repos/os/src/app/pci_decode/main.cc
View File

@@ -126,12 +126,15 @@ void Main::parse_pci_function(Bdf bdf,
} }
}); });
cfg.for_each_bar([&] (uint64_t addr, size_t size, unsigned bar) { cfg.for_each_bar([&] (uint64_t addr, size_t size,
unsigned bar, bool pf)
{
gen.node("io_mem", [&] gen.node("io_mem", [&]
{ {
gen.attribute("pci_bar", bar); gen.attribute("pci_bar", bar);
gen.attribute("address", string(addr)); gen.attribute("address", string(addr));
gen.attribute("size", string(size)); gen.attribute("size", string(size));
if (pf) gen.attribute("prefetchable", true);
}); });
}, [&] (uint64_t addr, size_t size, unsigned bar) { }, [&] (uint64_t addr, size_t size, unsigned bar) {
gen.node("io_port_range", [&] gen.node("io_port_range", [&]