In order to provide CFMWs on sbsa-ref, this extends 1TB space from the hole above RAM Memory [SBSA_MEM] for CXL Fixed Memory Window. 0xA0000000000 is chosen as the base address of this space because of 3 reasons:
1) It is more suitable to choose a static address instead of that implementation in virt, since a dynamic address space layout of sbsa-ref is not appropriate for its original purpose as a reference platform.
2) The Hotplug Memory address range should in the range of maximum addressable range of sbsa-ref platform(0x10000000000-0x80ffffffffff). It is satisfied the requirements of memory hotplug in linux kernel.
3) The start pfn of CFMW should exceed the reserved_pfn_range for onlined numa node.
Based on 'cxl_fmws_link_targets', this adds a new function 'sbsa_cxl_fmws_link_targets' for binding cfmws.target with the default pxb-cxl-bus on sbsa-ref.
In addition, this also adds 'create_cxl_fixed_window_region' which based on 'machine_set_cfmw' to support creating a static cfmw region on sbsa-ref.
Thus, to run sbsa-ref with a cxl device could use: qemu-system-aarch64 \ -machine sbsa-ref \ -cpu cortex-a57 \ -smp 4 \ -m 4G \ -object memory-backend-ram,size=2G,id=mem0 \ -numa node,nodeid=0,cpus=0-1,memdev=mem0 \ -object memory-backend-ram,size=2G,id=mem1 \ -numa node,nodeid=1,cpus=2-3,memdev=mem1 \ -object memory-backend-file,id=mem2,mem-path=/tmp/mem2,size=256M,share=true \ -device cxl-type3,bus=cxl.0,volatile-memdev=mem2,id=cxl-mem1 \ -hda ubuntu.ext4 \ -pflash SBSA_FLASH0.fd \ -pflash SBSA_FLASH1.fd \
I'm not sure if the new space layout would bring a series of bad influence, this patch is here to hopefully some comments to guide me!
Signed-off-by: Yuquan Wang wangyuquan1236@phytium.com.cn --- hw/arm/sbsa-ref.c | 73 +++++++++++++++++++++++++++++ hw/cxl/cxl-host-stubs.c | 1 + hw/cxl/cxl-host.c | 2 +- hw/pci-bridge/pci_expander_bridge.c | 1 - include/hw/cxl/cxl_host.h | 1 + include/hw/pci/pci_bridge.h | 1 + 6 files changed, 77 insertions(+), 2 deletions(-)
diff --git a/hw/arm/sbsa-ref.c b/hw/arm/sbsa-ref.c index dc924d181e..b10865920e 100644 --- a/hw/arm/sbsa-ref.c +++ b/hw/arm/sbsa-ref.c @@ -100,6 +100,7 @@ enum { SBSA_AHCI, SBSA_XHCI, SBSA_CXL_HOST, + SBSA_CXL_FIXED_WINDOW, };
struct SBSAMachineState { @@ -152,6 +153,8 @@ static const MemMapEntry sbsa_ref_memmap[] = { /* ~1TB PCIE MMIO space (4GB to 1024GB boundary) */ [SBSA_PCIE_MMIO_HIGH] = { 0x100000000ULL, 0xFF00000000ULL }, [SBSA_MEM] = { 0x10000000000ULL, RAMLIMIT_BYTES }, + /* 1TB CXL FIXED WINDOW space */ + [SBSA_CXL_FIXED_WINDOW] = { 0xA0000000000ULL, 0x10000000000ULL }, };
static const int sbsa_ref_irqmap[] = { @@ -734,6 +737,72 @@ static void create_cxl_host_reg_region(SBSAMachineState *sms) memory_region_add_subregion(sysmem, sbsa_ref_memmap[SBSA_CXL_HOST].base, mr); }
+static void create_cxl_fixed_window_region(SBSAMachineState *sms, MemoryRegion *mem) +{ + char cxl_host[] = "pxb-cxl-bus.0"; + CXLFixedMemoryWindowOptionsList *list; + hwaddr base, end; + GList *it; + strList host_target = { NULL, cxl_host }; + CXLFixedMemoryWindowOptions sbsa_ref_cfmwoptions = { + .size = 1 * TiB, + .has_interleave_granularity = false, + .targets = &host_target, + }; + CXLFixedMemoryWindowOptionsList sbsa_ref_cfmwlist = { NULL, &sbsa_ref_cfmwoptions }; + + for (list = &sbsa_ref_cfmwlist; list; list = list->next) { + cxl_fixed_memory_window_config(&sms->cxl_devices_state, list->value, &error_fatal); + } + + base = sbsa_ref_memmap[SBSA_CXL_FIXED_WINDOW].base; + end = base + sbsa_ref_memmap[SBSA_CXL_FIXED_WINDOW].size; + + for (it = sms->cxl_devices_state.fixed_windows; it; it = it->next) { + CXLFixedWindow *fw = it->data; + if (base + fw->size > end) { + error_report("CFMWS does not fit under PA limit"); + exit(EXIT_FAILURE); + } + + fw->base = base; + memory_region_init_io(&fw->mr, OBJECT(sms), &cfmws_ops, fw, + "cxl-fixed-memory-region", fw->size); + + memory_region_add_subregion(mem, fw->base, &fw->mr); + base += fw->size; + } +} + +static void sbsa_cxl_fmws_link_targets(SBSAMachineState *sms, + CXLState *cxl_state, Error **errp) +{ + PXBCXLDev *pxb = PXB_CXL_DEV(pci_bridge_get_device(sms->cxlbus)); + if (cxl_state && cxl_state->fixed_windows) { + GList *it; + + for (it = cxl_state->fixed_windows; it; it = it->next) { + CXLFixedWindow *fw = it->data; + int i; + + for (i = 0; i < fw->num_targets; i++) { + Object *o; + bool ambig; + + o = object_resolve_path_type(fw->targets[i], + TYPE_PXB_CXL_BUS, + &ambig); + if (!o) { + error_setg(errp, "Could not resolve CXLFM target %s", + fw->targets[i]); + return; + } + fw->target_hbs[i] = pxb; + } + } + } +} + static void *sbsa_ref_dtb(const struct arm_boot_info *binfo, int *fdt_size) { const SBSAMachineState *board = container_of(binfo, SBSAMachineState, @@ -869,8 +938,12 @@ static void sbsa_ref_init(MachineState *machine)
create_cxl_host_reg_region(sms);
+ create_cxl_fixed_window_region(sms, sysmem); + cxl_hook_up_pxb_registers(sms->bus, &sms->cxl_devices_state, &error_fatal);
+ sbsa_cxl_fmws_link_targets(sms, &sms->cxl_devices_state, &error_fatal); + create_secure_ec(secure_sysmem);
sms->bootinfo.ram_size = machine->ram_size; diff --git a/hw/cxl/cxl-host-stubs.c b/hw/cxl/cxl-host-stubs.c index cae4afcdde..d523be24a2 100644 --- a/hw/cxl/cxl-host-stubs.c +++ b/hw/cxl/cxl-host-stubs.c @@ -11,5 +11,6 @@ void cxl_fmws_link_targets(CXLState *stat, Error **errp) {}; void cxl_machine_init(Object *obj, CXLState *state) {}; void cxl_hook_up_pxb_registers(PCIBus *bus, CXLState *state, Error **errp) {}; +void cxl_fixed_memory_window_config(CXLState *cxl_state, CXLFixedMemoryWindowOptions *object, Error **errp) {};
const MemoryRegionOps cfmws_ops; diff --git a/hw/cxl/cxl-host.c b/hw/cxl/cxl-host.c index e9f2543c43..d408c7db15 100644 --- a/hw/cxl/cxl-host.c +++ b/hw/cxl/cxl-host.c @@ -22,7 +22,7 @@ #include "hw/pci/pcie_port.h" #include "hw/pci-bridge/pci_expander_bridge.h"
-static void cxl_fixed_memory_window_config(CXLState *cxl_state, +void cxl_fixed_memory_window_config(CXLState *cxl_state, CXLFixedMemoryWindowOptions *object, Error **errp) { diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c index 0411ad31ea..f5431443b9 100644 --- a/hw/pci-bridge/pci_expander_bridge.c +++ b/hw/pci-bridge/pci_expander_bridge.c @@ -38,7 +38,6 @@ DECLARE_INSTANCE_CHECKER(PXBBus, PXB_BUS, DECLARE_INSTANCE_CHECKER(PXBBus, PXB_PCIE_BUS, TYPE_PXB_PCIE_BUS)
-#define TYPE_PXB_CXL_BUS "pxb-cxl-bus" DECLARE_INSTANCE_CHECKER(PXBBus, PXB_CXL_BUS, TYPE_PXB_CXL_BUS)
diff --git a/include/hw/cxl/cxl_host.h b/include/hw/cxl/cxl_host.h index c9bc9c7c50..5fbf5a9347 100644 --- a/include/hw/cxl/cxl_host.h +++ b/include/hw/cxl/cxl_host.h @@ -16,6 +16,7 @@ void cxl_machine_init(Object *obj, CXLState *state); void cxl_fmws_link_targets(CXLState *stat, Error **errp); void cxl_hook_up_pxb_registers(PCIBus *bus, CXLState *state, Error **errp); +void cxl_fixed_memory_window_config(CXLState *cxl_state, CXLFixedMemoryWindowOptions *object, Error **errp);
extern const MemoryRegionOps cfmws_ops;
diff --git a/include/hw/pci/pci_bridge.h b/include/hw/pci/pci_bridge.h index 5cd452115a..5456e24883 100644 --- a/include/hw/pci/pci_bridge.h +++ b/include/hw/pci/pci_bridge.h @@ -102,6 +102,7 @@ typedef struct PXBPCIEDev { PXBDev parent_obj; } PXBPCIEDev;
+#define TYPE_PXB_CXL_BUS "pxb-cxl-bus" #define TYPE_PXB_DEV "pxb" OBJECT_DECLARE_SIMPLE_TYPE(PXBDev, PXB_DEV)