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-rw-r--r--docs/specs/acpi_mem_hotplug.txt44
-rw-r--r--hw/acpi/Makefile.objs1
-rw-r--r--hw/acpi/memory_hotplug.c147
-rw-r--r--include/hw/acpi/memory_hotplug.h29
-rw-r--r--include/hw/acpi/pc-hotplug.h3
5 files changed, 224 insertions, 0 deletions
diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt
new file mode 100644
index 0000000000..12909940cc
--- /dev/null
+++ b/docs/specs/acpi_mem_hotplug.txt
@@ -0,0 +1,44 @@
+QEMU<->ACPI BIOS memory hotplug interface
+--------------------------------------
+
+ACPI BIOS GPE.3 handler is dedicated for notifying OS about memory hot-add
+events.
+
+Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
+---------------------------------------------------------------
+0xa00:
+ read access:
+ [0x0-0x3] Lo part of memory device phys address
+ [0x4-0x7] Hi part of memory device phys address
+ [0x8-0xb] Lo part of memory device size in bytes
+ [0xc-0xf] Hi part of memory device size in bytes
+ [0x10-0x13] Memory device proximity domain
+ [0x14] Memory device status fields
+ bits:
+ 0: Device is enabled and may be used by guest
+ 1: Device insert event, used to distinguish device for which
+ no device check event to OSPM was issued.
+ It's valid only when bit 1 is set.
+ 2-7: reserved and should be ignored by OSPM
+ [0x15-0x17] reserved
+
+ write access:
+ [0x0-0x3] Memory device slot selector, selects active memory device.
+ All following accesses to other registers in 0xa00-0xa17
+ region will read/store data from/to selected memory device.
+ [0x4-0x7] OST event code reported by OSPM
+ [0x8-0xb] OST status code reported by OSPM
+ [0xc-0x13] reserved, writes into it are ignored
+ [0x14] Memory device control fields
+ bits:
+ 0: reserved, OSPM must clear it before writing to register
+ 1: if set to 1 clears device insert event, set by OSPM
+ after it has emitted device check event for the
+ selected memory device
+ 2-7: reserved, OSPM must clear them before writing to register
+
+Selecting memory device slot beyond present range has no effect on platform:
+ - write accesses to memory hot-plug registers not documented above are
+ ignored
+ - read accesses to memory hot-plug registers not documented above return
+ all bits set to 1.
diff --git a/hw/acpi/Makefile.objs b/hw/acpi/Makefile.objs
index 397d32babd..004e1b2090 100644
--- a/hw/acpi/Makefile.objs
+++ b/hw/acpi/Makefile.objs
@@ -1 +1,2 @@
common-obj-$(CONFIG_ACPI) += core.o piix4.o ich9.o pcihp.o cpu_hotplug.o
+common-obj-$(CONFIG_ACPI) += memory_hotplug.o
diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
new file mode 100644
index 0000000000..e3a13ed412
--- /dev/null
+++ b/hw/acpi/memory_hotplug.c
@@ -0,0 +1,147 @@
+#include "hw/acpi/memory_hotplug.h"
+#include "hw/acpi/pc-hotplug.h"
+#include "hw/mem/pc-dimm.h"
+#include "hw/boards.h"
+
+static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr,
+ unsigned int size)
+{
+ uint32_t val = 0;
+ MemHotplugState *mem_st = opaque;
+ MemStatus *mdev;
+ Object *o;
+
+ if (mem_st->selector >= mem_st->dev_count) {
+ return 0;
+ }
+
+ mdev = &mem_st->devs[mem_st->selector];
+ o = OBJECT(mdev->dimm);
+ switch (addr) {
+ case 0x0: /* Lo part of phys address where DIMM is mapped */
+ val = o ? object_property_get_int(o, PC_DIMM_ADDR_PROP, NULL) : 0;
+ break;
+ case 0x4: /* Hi part of phys address where DIMM is mapped */
+ val = o ? object_property_get_int(o, PC_DIMM_ADDR_PROP, NULL) >> 32 : 0;
+ break;
+ case 0x8: /* Lo part of DIMM size */
+ val = o ? object_property_get_int(o, PC_DIMM_SIZE_PROP, NULL) : 0;
+ break;
+ case 0xc: /* Hi part of DIMM size */
+ val = o ? object_property_get_int(o, PC_DIMM_SIZE_PROP, NULL) >> 32 : 0;
+ break;
+ case 0x10: /* node proximity for _PXM method */
+ val = o ? object_property_get_int(o, PC_DIMM_NODE_PROP, NULL) : 0;
+ break;
+ case 0x14: /* pack and return is_* fields */
+ val |= mdev->is_enabled ? 1 : 0;
+ val |= mdev->is_inserting ? 2 : 0;
+ break;
+ default:
+ val = ~0;
+ break;
+ }
+ return val;
+}
+
+static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data,
+ unsigned int size)
+{
+ MemHotplugState *mem_st = opaque;
+ MemStatus *mdev;
+
+ if (!mem_st->dev_count) {
+ return;
+ }
+
+ if (addr) {
+ if (mem_st->selector >= mem_st->dev_count) {
+ return;
+ }
+ }
+
+ switch (addr) {
+ case 0x0: /* DIMM slot selector */
+ mem_st->selector = data;
+ break;
+ case 0x4: /* _OST event */
+ mdev = &mem_st->devs[mem_st->selector];
+ if (data == 1) {
+ /* TODO: handle device insert OST event */
+ } else if (data == 3) {
+ /* TODO: handle device remove OST event */
+ }
+ mdev->ost_event = data;
+ break;
+ case 0x8: /* _OST status */
+ mdev = &mem_st->devs[mem_st->selector];
+ mdev->ost_status = data;
+ /* TODO: report async error */
+ /* TODO: implement memory removal on guest signal */
+ break;
+ case 0x14:
+ mdev = &mem_st->devs[mem_st->selector];
+ if (data & 2) { /* clear insert event */
+ mdev->is_inserting = false;
+ }
+ break;
+ }
+
+}
+static const MemoryRegionOps acpi_memory_hotplug_ops = {
+ .read = acpi_memory_hotplug_read,
+ .write = acpi_memory_hotplug_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid = {
+ .min_access_size = 1,
+ .max_access_size = 4,
+ },
+};
+
+void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
+ MemHotplugState *state)
+{
+ MachineState *machine = MACHINE(qdev_get_machine());
+
+ state->dev_count = machine->ram_slots;
+ if (!state->dev_count) {
+ return;
+ }
+
+ state->devs = g_malloc0(sizeof(*state->devs) * state->dev_count);
+ memory_region_init_io(&state->io, owner, &acpi_memory_hotplug_ops, state,
+ "apci-mem-hotplug", ACPI_MEMORY_HOTPLUG_IO_LEN);
+ memory_region_add_subregion(as, ACPI_MEMORY_HOTPLUG_BASE, &state->io);
+}
+
+void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
+ DeviceState *dev, Error **errp)
+{
+ MemStatus *mdev;
+ Error *local_err = NULL;
+ int slot = object_property_get_int(OBJECT(dev), "slot", &local_err);
+
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
+
+ if (slot >= mem_st->dev_count) {
+ char *dev_path = object_get_canonical_path(OBJECT(dev));
+ error_setg(errp, "acpi_memory_plug_cb: "
+ "device [%s] returned invalid memory slot[%d]",
+ dev_path, slot);
+ g_free(dev_path);
+ return;
+ }
+
+ mdev = &mem_st->devs[slot];
+ mdev->dimm = dev;
+ mdev->is_enabled = true;
+ mdev->is_inserting = true;
+
+ /* do ACPI magic */
+ ar->gpe.sts[0] |= ACPI_MEMORY_HOTPLUG_STATUS;
+ acpi_update_sci(ar, irq);
+ return;
+}
diff --git a/include/hw/acpi/memory_hotplug.h b/include/hw/acpi/memory_hotplug.h
new file mode 100644
index 0000000000..8f90f72fdb
--- /dev/null
+++ b/include/hw/acpi/memory_hotplug.h
@@ -0,0 +1,29 @@
+#ifndef QEMU_HW_ACPI_MEMORY_HOTPLUG_H
+#define QEMU_HW_ACPI_MEMORY_HOTPLUG_H
+
+#include "hw/qdev-core.h"
+#include "hw/acpi/acpi.h"
+
+#define ACPI_MEMORY_HOTPLUG_STATUS 8
+
+typedef struct MemStatus {
+ DeviceState *dimm;
+ bool is_enabled;
+ bool is_inserting;
+ uint32_t ost_event;
+ uint32_t ost_status;
+} MemStatus;
+
+typedef struct MemHotplugState {
+ MemoryRegion io;
+ uint32_t selector;
+ uint32_t dev_count;
+ MemStatus *devs;
+} MemHotplugState;
+
+void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
+ MemHotplugState *state);
+
+void acpi_memory_plug_cb(ACPIREGS *ar, qemu_irq irq, MemHotplugState *mem_st,
+ DeviceState *dev, Error **errp);
+#endif
diff --git a/include/hw/acpi/pc-hotplug.h b/include/hw/acpi/pc-hotplug.h
index cee479de63..01d38e2e7e 100644
--- a/include/hw/acpi/pc-hotplug.h
+++ b/include/hw/acpi/pc-hotplug.h
@@ -29,4 +29,7 @@
#define ICH9_CPU_HOTPLUG_IO_BASE 0x0CD8
#define PIIX4_CPU_HOTPLUG_IO_BASE 0xaf00
+#define ACPI_MEMORY_HOTPLUG_IO_LEN 24
+#define ACPI_MEMORY_HOTPLUG_BASE 0x0a00
+
#endif
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-16 06:44:26 +0000