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[bus][pci] add routines to pass in PCI bus resources prior to starting the pci bus manager

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Wire them up on arm and riscv which need them. x86-pc does not, so dont
call it.

Also fix a few miscellaneous bugs, notably PCI not detecting 64bit bars
properly due to an off by one bit error.
This commit is contained in:
Travis Geiselbrecht
2022-01-29 01:29:57 -08:00
parent 06ab680159
commit 36e73e0fac
8 changed files with 84 additions and 22 deletions
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14
dev/bus/pci/bus_mgr/bus_mgr.cpp
View File

@@ -129,6 +129,12 @@ status_t pci_bus_mgr_init() {
return NO_ERROR;
}
status_t pci_bus_mgr_add_resource(enum pci_resource_type type, uint64_t mmio_base, uint64_t aux_base, uint64_t len) {
TRACEF("type %d: mmio base %#llx aux base %#llx len %#llx\n", type, mmio_base, aux_base, len);
return NO_ERROR;
}
// for every bus in the system, pass the visit routine to the device
status_t pci_bus_mgr_visit_devices(pci_visit_routine routine, void *cookie) {
auto v = [&](device *d) -> status_t {
@@ -261,11 +267,15 @@ status_t pci_bus_mgr_allocate_irq(const pci_location_t loc, uint *irqbase) {
return d->allocate_irq(irqbase);
}
void pci_dump_bar(const pci_bar_t *bar, int index) {
printf("BAR %d: addr %-#16llx size %-#16zx io %d 64bit %d prefetch %d\n",
index, bar->addr, bar->size, bar->io, bar->size_64, bar->prefetchable);
}
void pci_dump_bars(pci_bar_t bar[6], size_t count) {
for (size_t i = 0; i < count; i++) {
if (bar[i].valid) {
printf("BAR %zu: addr %#16llx size %#16zx io %d\n",
i, bar[i].addr, bar[i].size, bar[i].io);
pci_dump_bar(bar + i, i);
}
}
}

27
dev/bus/pci/bus_mgr/device.cpp
View File

@@ -123,7 +123,7 @@ void device::dump(size_t indent) {
for (size_t i = 0; i < indent + 1; i++) {
printf(" ");
}
printf("BAR %zu: addr %#llx size %#zx io %d valid %d\n", b, bars_[b].addr, bars_[b].size, bars_[b].io, bars_[b].valid);
pci_dump_bar(bars_ + b, b);
}
}
}
@@ -316,11 +316,13 @@ status_t device::load_bars() {
}
for (size_t i=0; i < num_bars; i++) {
bars_[i].valid = false;
bars_[i] = {};
uint64_t bar_addr = config_.type0.base_addresses[i];
if (bar_addr & 0x1) {
// io address
bars_[i].io = true;
bars_[i].prefetchable = false;
bars_[i].size_64 = false;
bars_[i].addr = bar_addr & ~0x3;
// probe size by writing all 1s and seeing what bits are masked
@@ -333,9 +335,11 @@ status_t device::load_bars() {
bars_[i].size = ((size & ~0b11) ^ 0xffff) + 1;
bars_[i].valid = (bars_[i].size != 0);
} else if ((bar_addr & 0b110) == 0) {
} else if ((bar_addr & 0b110) == 0b000) {
// 32bit memory address
bars_[i].io = false;
bars_[i].prefetchable = bar_addr & (1<<3);
bars_[i].size_64 = false;
bars_[i].addr = bar_addr & ~0xf;
// probe size by writing all 1s and seeing what bits are masked
@@ -348,13 +352,16 @@ status_t device::load_bars() {
bars_[i].size = (~(size & ~0b1111)) + 1;
bars_[i].valid = (bars_[i].size != 0);
} else if ((bar_addr & 0b110) == 2) {
} else if ((bar_addr & 0b110) == 0b100) {
// 64bit memory address
if (i % 2) {
// root of 64bit memory range can only be on 0, 2, 4 slot
if (i >= num_bars - 1) {
// root of 64bit memory range will use up two slots, so cant
// start at the last bar
continue;
}
bars_[i].io = false;
bars_[i].prefetchable = bar_addr & (1<<3);
bars_[i].size_64 = true;
bars_[i].addr = bar_addr & ~0xf;
bars_[i].addr |= (uint64_t)config_.type0.base_addresses[i + 1] << 32;
@@ -364,11 +371,11 @@ status_t device::load_bars() {
pci_write_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4, 0xffffffff);
pci_read_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4, &size32);
size = size32;
pci_write_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4 + 1, 0xffffffff);
pci_read_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4 + 1, &size32);
pci_write_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4 + 4, 0xffffffff);
pci_read_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4 + 4, &size32);
size |= (uint64_t)size32 << 32;
pci_write_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4, bars_[i].addr);
pci_write_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4 + 1, bars_[i].addr >> 32);
pci_write_config_word(loc_, PCI_CONFIG_BASE_ADDRESSES + i * 4 + 4, bars_[i].addr >> 32);
// mask out bottom bits, invert and add 1 to compute size
bars_[i].size = (~(size & ~(uint64_t)0b1111)) + 1;
@@ -377,7 +384,7 @@ status_t device::load_bars() {
// mark the next entry as invalid
i++;
bars_[i].valid = false;
bars_[i] = {}; // clears the valid bit
}
}

11
dev/bus/pci/include/dev/bus/pci.h
View File

@@ -31,6 +31,8 @@ typedef struct {
uint64_t addr;
size_t size;
bool io;
bool prefetchable;
bool size_64;
bool valid;
} pci_bar_t;
@@ -83,6 +85,14 @@ status_t pci_write_config_word(pci_location_t state, uint32_t reg, uint32_t valu
typedef void(*pci_visit_routine)(pci_location_t loc, void *cookie);
status_t pci_bus_mgr_visit_devices(pci_visit_routine routine, void *cookie);
// must be called before pci_bus_mgr_init if available
enum pci_resource_type {
PCI_RESOURCE_IO_RANGE, // aux base is base of io range, mmio base is if memory mapped
PCI_RESOURCE_MMIO_RANGE,
PCI_RESOURCE_MMIO64_RANGE,
};
status_t pci_bus_mgr_add_resource(enum pci_resource_type, uint64_t mmio_base, uint64_t aux_base, uint64_t len);
// must be called after pci_init_*();
status_t pci_bus_mgr_init(void);
@@ -109,6 +119,7 @@ status_t pci_bus_mgr_allocate_irq(const pci_location_t loc, uint *irqbase);
// return a pointer to a formatted string
const char *pci_loc_string(pci_location_t loc, char out_str[14]);
void pci_dump_bar(const pci_bar_t *bar, int index);
void pci_dump_bars(pci_bar_t bar[6], size_t count);
__END_CDECLS

1
dev/bus/pci/pci.cpp
View File

@@ -290,7 +290,6 @@ status_t pci_init_ecam(paddr_t ecam_base, uint16_t segment, uint8_t start_bus, u
if ((pcib = pci_ecam::detect(ecam_base, segment, start_bus, end_bus))) {
dprintf(INFO, "PCI: pci ecam functions installed\n");
dprintf(INFO, "PCI: last pci bus is %d\n", pcib->get_last_bus());
pci_bus_mgr_init();
return NO_ERROR;
}