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-rw-r--r--hw/cxl/cxl-host-stubs.c14
-rw-r--r--hw/cxl/cxl-host.c94
-rw-r--r--hw/cxl/meson.build6
-rw-r--r--include/hw/cxl/cxl.h21
-rw-r--r--qapi/machine.json21
-rw-r--r--qemu-options.hx38
-rw-r--r--softmmu/vl.c47
7 files changed, 241 insertions, 0 deletions
diff --git a/hw/cxl/cxl-host-stubs.c b/hw/cxl/cxl-host-stubs.c
new file mode 100644
index 0000000000..f8fd278d5d
--- /dev/null
+++ b/hw/cxl/cxl-host-stubs.c
@@ -0,0 +1,14 @@
+/*
+ * CXL host parameter parsing routine stubs
+ *
+ * Copyright (c) 2022 Huawei
+ */
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/cxl/cxl.h"
+
+void cxl_fixed_memory_window_config(MachineState *ms,
+ CXLFixedMemoryWindowOptions *object,
+ Error **errp) {};
+
+void cxl_fixed_memory_window_link_targets(Error **errp) {};
diff --git a/hw/cxl/cxl-host.c b/hw/cxl/cxl-host.c
new file mode 100644
index 0000000000..ec5a75cbf5
--- /dev/null
+++ b/hw/cxl/cxl-host.c
@@ -0,0 +1,94 @@
+/*
+ * CXL host parameter parsing routines
+ *
+ * Copyright (c) 2022 Huawei
+ * Modeled loosely on the NUMA options handling in hw/core/numa.c
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/units.h"
+#include "qemu/bitmap.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "sysemu/qtest.h"
+#include "hw/boards.h"
+
+#include "qapi/qapi-visit-machine.h"
+#include "hw/cxl/cxl.h"
+
+void cxl_fixed_memory_window_config(MachineState *ms,
+ CXLFixedMemoryWindowOptions *object,
+ Error **errp)
+{
+ CXLFixedWindow *fw = g_malloc0(sizeof(*fw));
+ strList *target;
+ int i;
+
+ for (target = object->targets; target; target = target->next) {
+ fw->num_targets++;
+ }
+
+ fw->enc_int_ways = cxl_interleave_ways_enc(fw->num_targets, errp);
+ if (*errp) {
+ return;
+ }
+
+ fw->targets = g_malloc0_n(fw->num_targets, sizeof(*fw->targets));
+ for (i = 0, target = object->targets; target; i++, target = target->next) {
+ /* This link cannot be resolved yet, so stash the name for now */
+ fw->targets[i] = g_strdup(target->value);
+ }
+
+ if (object->size % (256 * MiB)) {
+ error_setg(errp,
+ "Size of a CXL fixed memory window must my a multiple of 256MiB");
+ return;
+ }
+ fw->size = object->size;
+
+ if (object->has_interleave_granularity) {
+ fw->enc_int_gran =
+ cxl_interleave_granularity_enc(object->interleave_granularity,
+ errp);
+ if (*errp) {
+ return;
+ }
+ } else {
+ /* Default to 256 byte interleave */
+ fw->enc_int_gran = 0;
+ }
+
+ ms->cxl_devices_state->fixed_windows =
+ g_list_append(ms->cxl_devices_state->fixed_windows, fw);
+
+ return;
+}
+
+void cxl_fixed_memory_window_link_targets(Error **errp)
+{
+ MachineState *ms = MACHINE(qdev_get_machine());
+
+ if (ms->cxl_devices_state && ms->cxl_devices_state->fixed_windows) {
+ GList *it;
+
+ for (it = ms->cxl_devices_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_DEVICE,
+ &ambig);
+ if (!o) {
+ error_setg(errp, "Could not resolve CXLFM target %s",
+ fw->targets[i]);
+ return;
+ }
+ fw->target_hbs[i] = PXB_CXL_DEV(o);
+ }
+ }
+ }
+}
diff --git a/hw/cxl/meson.build b/hw/cxl/meson.build
index e68eea2358..f117b99949 100644
--- a/hw/cxl/meson.build
+++ b/hw/cxl/meson.build
@@ -3,4 +3,10 @@ softmmu_ss.add(when: 'CONFIG_CXL',
'cxl-component-utils.c',
'cxl-device-utils.c',
'cxl-mailbox-utils.c',
+ 'cxl-host.c',
+ ),
+ if_false: files(
+ 'cxl-host-stubs.c',
))
+
+softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('cxl-host-stubs.c'))
diff --git a/include/hw/cxl/cxl.h b/include/hw/cxl/cxl.h
index 8d1a7245d0..dce38124db 100644
--- a/include/hw/cxl/cxl.h
+++ b/include/hw/cxl/cxl.h
@@ -10,6 +10,9 @@
#ifndef CXL_H
#define CXL_H
+
+#include "qapi/qapi-types-machine.h"
+#include "hw/pci/pci_bridge.h"
#include "hw/pci/pci_host.h"
#include "cxl_pci.h"
#include "cxl_component.h"
@@ -20,10 +23,23 @@
#define CXL_WINDOW_MAX 10
+typedef struct CXLFixedWindow {
+ uint64_t size;
+ char **targets;
+ struct PXBDev *target_hbs[8];
+ uint8_t num_targets;
+ uint8_t enc_int_ways;
+ uint8_t enc_int_gran;
+ /* Todo: XOR based interleaving */
+ MemoryRegion mr;
+ hwaddr base;
+} CXLFixedWindow;
+
typedef struct CXLState {
bool is_enabled;
MemoryRegion host_mr;
unsigned int next_mr_idx;
+ GList *fixed_windows;
} CXLState;
struct CXLHost {
@@ -35,4 +51,9 @@ struct CXLHost {
#define TYPE_PXB_CXL_HOST "pxb-cxl-host"
OBJECT_DECLARE_SIMPLE_TYPE(CXLHost, PXB_CXL_HOST)
+void cxl_fixed_memory_window_config(MachineState *ms,
+ CXLFixedMemoryWindowOptions *object,
+ Error **errp);
+void cxl_fixed_memory_window_link_targets(Error **errp);
+
#endif
diff --git a/qapi/machine.json b/qapi/machine.json
index 92480d4044..3f1eab3482 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -503,6 +503,27 @@
'val': 'uint8' }}
##
+# @CXLFixedMemoryWindowOptions:
+#
+# Create a CXL Fixed Memory Window
+#
+# @size: Size of the Fixed Memory Window in bytes. Must be a multiple
+# of 256MiB.
+# @interleave-granularity: Number of contiguous bytes for which
+# accesses will go to a given interleave target.
+# Accepted values [256, 512, 1k, 2k, 4k, 8k, 16k]
+# @targets: Target root bridge IDs from -device ...,id=<ID> for each root
+# bridge.
+#
+# Since 7.1
+##
+{ 'struct': 'CXLFixedMemoryWindowOptions',
+ 'data': {
+ 'size': 'size',
+ '*interleave-granularity': 'size',
+ 'targets': ['str'] }}
+
+##
# @X86CPURegister32:
#
# A X86 32-bit register
diff --git a/qemu-options.hx b/qemu-options.hx
index 796229c433..315bb18595 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -467,6 +467,44 @@ SRST
-numa hmat-cache,node-id=1,size=10K,level=1,associativity=direct,policy=write-back,line=8
ERST
+DEF("cxl-fixed-memory-window", HAS_ARG, QEMU_OPTION_cxl_fixed_memory_window,
+ "-cxl-fixed-memory-window targets.0=firsttarget,targets.1=secondtarget,size=size[,interleave-granularity=granularity]\n",
+ QEMU_ARCH_ALL)
+SRST
+``-cxl-fixed-memory-window targets.0=firsttarget,targets.1=secondtarget,size=size[,interleave-granularity=granularity]``
+ Define a CXL Fixed Memory Window (CFMW).
+
+ Described in the CXL 2.0 ECN: CEDT CFMWS & QTG _DSM.
+
+ They are regions of Host Physical Addresses (HPA) on a system which
+ may be interleaved across one or more CXL host bridges. The system
+ software will assign particular devices into these windows and
+ configure the downstream Host-managed Device Memory (HDM) decoders
+ in root ports, switch ports and devices appropriately to meet the
+ interleave requirements before enabling the memory devices.
+
+ ``targets.X=firsttarget`` provides the mapping to CXL host bridges
+ which may be identified by the id provied in the -device entry.
+ Multiple entries are needed to specify all the targets when
+ the fixed memory window represents interleaved memory. X is the
+ target index from 0.
+
+ ``size=size`` sets the size of the CFMW. This must be a multiple of
+ 256MiB. The region will be aligned to 256MiB but the location is
+ platform and configuration dependent.
+
+ ``interleave-granularity=granularity`` sets the granularity of
+ interleave. Default 256KiB. Only 256KiB, 512KiB, 1024KiB, 2048KiB
+ 4096KiB, 8192KiB and 16384KiB granularities supported.
+
+ Example:
+
+ ::
+
+ -cxl-fixed-memory-window targets.0=cxl.0,targets.1=cxl.1,size=128G,interleave-granularity=512k
+
+ERST
+
DEF("add-fd", HAS_ARG, QEMU_OPTION_add_fd,
"-add-fd fd=fd,set=set[,opaque=opaque]\n"
" Add 'fd' to fd 'set'\n", QEMU_ARCH_ALL)
diff --git a/softmmu/vl.c b/softmmu/vl.c
index 817d515783..2390c13fb6 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -93,6 +93,7 @@
#include "qemu/config-file.h"
#include "qemu/qemu-options.h"
#include "qemu/main-loop.h"
+#include "hw/cxl/cxl.h"
#ifdef CONFIG_VIRTFS
#include "fsdev/qemu-fsdev.h"
#endif
@@ -118,6 +119,7 @@
#include "qapi/qapi-events-run-state.h"
#include "qapi/qapi-visit-block-core.h"
#include "qapi/qapi-visit-compat.h"
+#include "qapi/qapi-visit-machine.h"
#include "qapi/qapi-visit-ui.h"
#include "qapi/qapi-commands-block-core.h"
#include "qapi/qapi-commands-migration.h"
@@ -143,6 +145,12 @@ typedef struct BlockdevOptionsQueueEntry {
typedef QSIMPLEQ_HEAD(, BlockdevOptionsQueueEntry) BlockdevOptionsQueue;
+typedef struct CXLFMWOptionQueueEntry {
+ CXLFixedMemoryWindowOptions *opts;
+ Location loc;
+ QSIMPLEQ_ENTRY(CXLFMWOptionQueueEntry) entry;
+} CXLFMWOptionQueueEntry;
+
typedef struct ObjectOption {
ObjectOptions *opts;
QTAILQ_ENTRY(ObjectOption) next;
@@ -169,6 +177,8 @@ static int snapshot;
static bool preconfig_requested;
static QemuPluginList plugin_list = QTAILQ_HEAD_INITIALIZER(plugin_list);
static BlockdevOptionsQueue bdo_queue = QSIMPLEQ_HEAD_INITIALIZER(bdo_queue);
+static QSIMPLEQ_HEAD(, CXLFMWOptionQueueEntry) CXLFMW_opts =
+ QSIMPLEQ_HEAD_INITIALIZER(CXLFMW_opts);
static bool nographic = false;
static int mem_prealloc; /* force preallocation of physical target memory */
static const char *vga_model = NULL;
@@ -1153,6 +1163,24 @@ static void parse_display(const char *p)
}
}
+static void parse_cxl_fixed_memory_window(const char *optarg)
+{
+ CXLFMWOptionQueueEntry *cfmws_entry;
+ Visitor *v;
+
+ v = qobject_input_visitor_new_str(optarg, "cxl-fixed-memory-window",
+ &error_fatal);
+ cfmws_entry = g_new(CXLFMWOptionQueueEntry, 1);
+ visit_type_CXLFixedMemoryWindowOptions(v, NULL, &cfmws_entry->opts,
+ &error_fatal);
+ if (!cfmws_entry->opts) {
+ exit(1);
+ }
+ visit_free(v);
+ loc_save(&cfmws_entry->loc);
+ QSIMPLEQ_INSERT_TAIL(&CXLFMW_opts, cfmws_entry, entry);
+}
+
static inline bool nonempty_str(const char *str)
{
return str && *str;
@@ -2015,6 +2043,20 @@ static void qemu_create_late_backends(void)
qemu_semihosting_console_init();
}
+static void cxl_set_opts(void)
+{
+ while (!QSIMPLEQ_EMPTY(&CXLFMW_opts)) {
+ CXLFMWOptionQueueEntry *cfmws_entry = QSIMPLEQ_FIRST(&CXLFMW_opts);
+
+ loc_restore(&cfmws_entry->loc);
+ QSIMPLEQ_REMOVE_HEAD(&CXLFMW_opts, entry);
+ cxl_fixed_memory_window_config(current_machine, cfmws_entry->opts,
+ &error_fatal);
+ qapi_free_CXLFixedMemoryWindowOptions(cfmws_entry->opts);
+ g_free(cfmws_entry);
+ }
+}
+
static void qemu_resolve_machine_memdev(void)
{
if (ram_memdev_id) {
@@ -2661,6 +2703,7 @@ void qmp_x_exit_preconfig(Error **errp)
qemu_init_board();
qemu_create_cli_devices();
+ cxl_fixed_memory_window_link_targets(errp);
qemu_machine_creation_done();
if (loadvm) {
@@ -2841,6 +2884,9 @@ void qemu_init(int argc, char **argv, char **envp)
exit(1);
}
break;
+ case QEMU_OPTION_cxl_fixed_memory_window:
+ parse_cxl_fixed_memory_window(optarg);
+ break;
case QEMU_OPTION_display:
parse_display(optarg);
break;
@@ -3652,6 +3698,7 @@ void qemu_init(int argc, char **argv, char **envp)
qemu_resolve_machine_memdev();
parse_numa_opts(current_machine);
+ cxl_set_opts();
if (vmstate_dump_file) {
/* dump and exit */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-03 06:32:40 +0000