<I/O Base Register, I/O Limit Register> pair and <Prefetchable Memory Base Register, Prefetchable Memory Limit Register> pair are both optional. Do not reserve ranges if the above registers are not implemented.
Signed-off-by: Marcel Apfelbaum marcel.a@redhat.com --- src/fw/pciinit.c | 9 ++------- src/hw/pci.c | 34 ++++++++++++++++++++++++++++++++++ src/hw/pci.h | 9 +++++++++ 3 files changed, 45 insertions(+), 7 deletions(-)
diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c index 9b5d7ad..bbaecd6 100644 --- a/src/fw/pciinit.c +++ b/src/fw/pciinit.c @@ -26,13 +26,6 @@ #define PCI_BRIDGE_MEM_MIN (1<<21) // 2M == hugepage size #define PCI_BRIDGE_IO_MIN 0x1000 // mandated by pci bridge spec
-enum pci_region_type { - PCI_REGION_TYPE_IO, - PCI_REGION_TYPE_MEM, - PCI_REGION_TYPE_PREFMEM, - PCI_REGION_TYPE_COUNT, -}; - static const char *region_type_name[] = { [ PCI_REGION_TYPE_IO ] = "io", [ PCI_REGION_TYPE_MEM ] = "mem", @@ -681,6 +674,8 @@ static int pci_bios_check_devices(struct pci_bus *busses) for (type = 0; type < PCI_REGION_TYPE_COUNT; type++) { u64 align = (type == PCI_REGION_TYPE_IO) ? PCI_BRIDGE_IO_MIN : PCI_BRIDGE_MEM_MIN; + if (!pci_bridge_has_region(s->bus_dev, type)) + continue; if (pci_region_align(&s->r[type]) > align) align = pci_region_align(&s->r[type]); u64 sum = pci_region_sum(&s->r[type]); diff --git a/src/hw/pci.c b/src/hw/pci.c index 77cdba2..d5979af 100644 --- a/src/hw/pci.c +++ b/src/hw/pci.c @@ -244,6 +244,40 @@ u8 pci_find_capability(struct pci_device *pci, u8 cap_id) return 0; }
+static int pci_config_is_reserved(struct pci_device *pci, u32 addr) +{ + u8 val; + + val = pci_config_readb(pci->bdf, addr); + pci_config_writeb(pci->bdf, addr, 0xFF); + + if (!(pci_config_readb(pci->bdf, addr))) + return 1; + + pci_config_writeb(pci->bdf, addr, val); + return 0; +} + +int pci_bridge_has_region(struct pci_device *pci, + enum pci_region_type region_type) +{ + u8 base; + + switch (region_type) { + case PCI_REGION_TYPE_IO: + base = PCI_IO_BASE; + break; + case PCI_REGION_TYPE_PREFMEM: + base = PCI_PREF_MEMORY_BASE; + break; + default: + /* Regular memory support is mandatory */ + return 1; + } + + return !pci_config_is_reserved(pci, base); +} + void pci_reboot(void) { diff --git a/src/hw/pci.h b/src/hw/pci.h index e828225..0aaa84c 100644 --- a/src/hw/pci.h +++ b/src/hw/pci.h @@ -12,6 +12,13 @@ #define PCI_NUM_REGIONS 7 #define PCI_BRIDGE_NUM_REGIONS 2
+enum pci_region_type { + PCI_REGION_TYPE_IO, + PCI_REGION_TYPE_MEM, + PCI_REGION_TYPE_PREFMEM, + PCI_REGION_TYPE_COUNT, +}; + static inline u8 pci_bdf_to_bus(u16 bdf) { return bdf >> 8; } @@ -117,6 +124,8 @@ int pci_init_device(const struct pci_device_id *ids struct pci_device *pci_find_init_device(const struct pci_device_id *ids , void *arg); u8 pci_find_capability(struct pci_device *pci, u8 cap_id); +int pci_bridge_has_region(struct pci_device *pci, + enum pci_region_type region_type); void pci_reboot(void);
#endif