diff options
| -rw-r--r-- | hw/cxl/cxl-host-stubs.c | 2 | ||||
| -rw-r--r-- | hw/cxl/cxl-host.c | 128 | ||||
| -rw-r--r-- | include/hw/cxl/cxl.h | 2 |
3 files changed, 132 insertions, 0 deletions
diff --git a/hw/cxl/cxl-host-stubs.c b/hw/cxl/cxl-host-stubs.c index f8fd278d5d..24465a52ab 100644 --- a/hw/cxl/cxl-host-stubs.c +++ b/hw/cxl/cxl-host-stubs.c @@ -12,3 +12,5 @@ void cxl_fixed_memory_window_config(MachineState *ms, Error **errp) {}; void cxl_fixed_memory_window_link_targets(Error **errp) {}; + +const MemoryRegionOps cfmws_ops; diff --git a/hw/cxl/cxl-host.c b/hw/cxl/cxl-host.c index ec5a75cbf5..469b3c4ced 100644 --- a/hw/cxl/cxl-host.c +++ b/hw/cxl/cxl-host.c @@ -15,6 +15,10 @@ #include "qapi/qapi-visit-machine.h" #include "hw/cxl/cxl.h" +#include "hw/pci/pci_bus.h" +#include "hw/pci/pci_bridge.h" +#include "hw/pci/pci_host.h" +#include "hw/pci/pcie_port.h" void cxl_fixed_memory_window_config(MachineState *ms, CXLFixedMemoryWindowOptions *object, @@ -92,3 +96,127 @@ void cxl_fixed_memory_window_link_targets(Error **errp) } } } + +/* TODO: support, multiple hdm decoders */ +static bool cxl_hdm_find_target(uint32_t *cache_mem, hwaddr addr, + uint8_t *target) +{ + uint32_t ctrl; + uint32_t ig_enc; + uint32_t iw_enc; + uint32_t target_reg; + uint32_t target_idx; + + ctrl = cache_mem[R_CXL_HDM_DECODER0_CTRL]; + if (!FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, COMMITTED)) { + return false; + } + + ig_enc = FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, IG); + iw_enc = FIELD_EX32(ctrl, CXL_HDM_DECODER0_CTRL, IW); + target_idx = (addr / cxl_decode_ig(ig_enc)) % (1 << iw_enc); + + if (target_idx > 4) { + target_reg = cache_mem[R_CXL_HDM_DECODER0_TARGET_LIST_LO]; + target_reg >>= target_idx * 8; + } else { + target_reg = cache_mem[R_CXL_HDM_DECODER0_TARGET_LIST_LO]; + target_reg >>= (target_idx - 4) * 8; + } + *target = target_reg & 0xff; + + return true; +} + +static PCIDevice *cxl_cfmws_find_device(CXLFixedWindow *fw, hwaddr addr) +{ + CXLComponentState *hb_cstate; + PCIHostState *hb; + int rb_index; + uint32_t *cache_mem; + uint8_t target; + bool target_found; + PCIDevice *rp, *d; + + /* Address is relative to memory region. Convert to HPA */ + addr += fw->base; + + rb_index = (addr / cxl_decode_ig(fw->enc_int_gran)) % fw->num_targets; + hb = PCI_HOST_BRIDGE(fw->target_hbs[rb_index]->cxl.cxl_host_bridge); + if (!hb || !hb->bus || !pci_bus_is_cxl(hb->bus)) { + return NULL; + } + + hb_cstate = cxl_get_hb_cstate(hb); + if (!hb_cstate) { + return NULL; + } + + cache_mem = hb_cstate->crb.cache_mem_registers; + + target_found = cxl_hdm_find_target(cache_mem, addr, &target); + if (!target_found) { + return NULL; + } + + rp = pcie_find_port_by_pn(hb->bus, target); + if (!rp) { + return NULL; + } + + d = pci_bridge_get_sec_bus(PCI_BRIDGE(rp))->devices[0]; + + if (!d || !object_dynamic_cast(OBJECT(d), TYPE_CXL_TYPE3)) { + return NULL; + } + + return d; +} + +static MemTxResult cxl_read_cfmws(void *opaque, hwaddr addr, uint64_t *data, + unsigned size, MemTxAttrs attrs) +{ + CXLFixedWindow *fw = opaque; + PCIDevice *d; + + d = cxl_cfmws_find_device(fw, addr); + if (d == NULL) { + *data = 0; + /* Reads to invalid address return poison */ + return MEMTX_ERROR; + } + + return cxl_type3_read(d, addr + fw->base, data, size, attrs); +} + +static MemTxResult cxl_write_cfmws(void *opaque, hwaddr addr, + uint64_t data, unsigned size, + MemTxAttrs attrs) +{ + CXLFixedWindow *fw = opaque; + PCIDevice *d; + + d = cxl_cfmws_find_device(fw, addr); + if (d == NULL) { + /* Writes to invalid address are silent */ + return MEMTX_OK; + } + + return cxl_type3_write(d, addr + fw->base, data, size, attrs); +} + +const MemoryRegionOps cfmws_ops = { + .read_with_attrs = cxl_read_cfmws, + .write_with_attrs = cxl_write_cfmws, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid = { + .min_access_size = 1, + .max_access_size = 8, + .unaligned = true, + }, + .impl = { + .min_access_size = 1, + .max_access_size = 8, + .unaligned = true, + }, +}; diff --git a/include/hw/cxl/cxl.h b/include/hw/cxl/cxl.h index dce38124db..21d28ca110 100644 --- a/include/hw/cxl/cxl.h +++ b/include/hw/cxl/cxl.h @@ -56,4 +56,6 @@ void cxl_fixed_memory_window_config(MachineState *ms, Error **errp); void cxl_fixed_memory_window_link_targets(Error **errp); +extern const MemoryRegionOps cfmws_ops; + #endif |