NVDIMM devices is defined in ACPI 6.0 9.20 NVDIMM Devices
This is a root device under \_SB and specified NVDIMM device are under the
root device. Each NVDIMM device has _ADR which return its handle used to
associate MEMDEV table in NFIT
We reserve handle 0 for root device. In this patch, we save handle, arg0,
arg1 and arg2. Arg3 is conditionally saved in later patch
Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
hw/i386/acpi-build.c | 2 +
hw/mem/nvdimm/acpi.c | 130 ++++++++++++++++++++++++++++++++++++++++++++-
include/hw/mem/pc-nvdimm.h | 2 +
3 files changed, 132 insertions(+), 2 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 092ed2f..a792135 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1342,6 +1342,8 @@ build_ssdt(GArray *table_data, GArray *linker,
aml_append(sb_scope, scope);
}
}
+
+ pc_nvdimm_build_acpi_devices(sb_scope);
aml_append(ssdt, sb_scope);
}
diff --git a/hw/mem/nvdimm/acpi.c b/hw/mem/nvdimm/acpi.c
index e0f2ad3..909a8ef 100644
--- a/hw/mem/nvdimm/acpi.c
+++ b/hw/mem/nvdimm/acpi.c
@@ -135,10 +135,11 @@ struct nfit_dcr {
uint8_t reserved2[6];
} QEMU_PACKED;
-#define REVSISON_ID 1
-#define NFIT_FIC1 0x201
+#define REVSISON_ID 1
+#define NFIT_FIC1 0x201
#define MAX_NVDIMM_NUMBER 10
+#define NOTIFY_VALUE 0x99
static int get_nvdimm_device_number(GSList *list)
{
@@ -281,12 +282,15 @@ static size_t dsm_size;
static uint64_t dsm_read(void *opaque, hwaddr addr,
unsigned size)
{
+ fprintf(stderr, "BUG: we never read DSM notification MMIO.\n");
+ assert(0);
return 0;
}
static void dsm_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
+ assert(val == NOTIFY_VALUE);
}
static const MemoryRegionOps dsm_ops = {
@@ -361,3 +365,125 @@ void pc_nvdimm_build_nfit_table(GArray *table_offsets, GArray *table_data,
exit:
g_slist_free(list);
}
+
+#define BUILD_STA_METHOD(_dev_, _method_) \
+ do { \
+ _method_ = aml_method("_STA", 0); \
+ aml_append(_method_, aml_return(aml_int(0x0f))); \
+ aml_append(_dev_, _method_); \
+ } while (0)
+
+#define SAVE_ARG012_HANDLE(_method_, _handle_) \
+ do { \
+ aml_append(_method_, aml_store(_handle_, aml_name("HDLE"))); \
+ aml_append(_method_, aml_store(aml_arg(0), aml_name("ARG0"))); \
+ aml_append(_method_, aml_store(aml_arg(1), aml_name("ARG1"))); \
+ aml_append(_method_, aml_store(aml_arg(2), aml_name("ARG2"))); \
+ } while (0)
+
+#define NOTIFY_AND_RETURN(_method_) \
+ do { \
+ aml_append(_method_, aml_store(aml_int(NOTIFY_VALUE), \
+ aml_name("NOTI"))); \
+ aml_append(_method_, aml_return(aml_name("ODAT"))); \
+ } while (0)
+
+static void build_nvdimm_devices(Aml *root_dev, GSList *list)
+{
+ for (; list; list = list->next) {
+ PCNVDIMMDevice *nvdimm = list->data;
+ uint32_t handle = nvdimm_index_to_handle(nvdimm->device_index);
+ Aml *dev, *method;
+
+ dev = aml_device("NVD%d", nvdimm->device_index);
+ aml_append(dev, aml_name_decl("_ADR", aml_int(handle)));
+
+ BUILD_STA_METHOD(dev, method);
+
+ method = aml_method("_DSM", 4);
+ {
+ SAVE_ARG012_HANDLE(method, aml_int(handle));
+ NOTIFY_AND_RETURN(method);
+ }
+ aml_append(dev, method);
+
+ aml_append(root_dev, dev);
+ }
+}
+
+void pc_nvdimm_build_acpi_devices(Aml *sb_scope)
+{
+ Aml *dev, *method, *field;
+ struct dsm_buffer *dsm_buf;
+ GSList *list = get_nvdimm_built_list();
+ int nr = get_nvdimm_device_number(list);
+
+ if (nr <= 0 || nr > MAX_NVDIMM_NUMBER) {
+ g_slist_free(list);
+ return;
+ }
+
+ dev = aml_device("NVDR");
+ aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0012")));
+
+ /* map DSM buffer into ACPI namespace. */
+ aml_append(dev, aml_operation_region("DSMR", AML_SYSTEM_MEMORY,
+ dsm_addr, dsm_size));
+
+ /*
+ * DSM input:
+ * @HDLE: store device's handle, it's zero if the _DSM call happens
+ * on ROOT.
+ * @ARG0 ~ @ARG3: store the parameters of _DSM call.
+ *
+ * They are ram mapping on host so that these access never cause VM-EXIT.
+ */
+ field = aml_field("DSMR", AML_DWORD_ACC, AML_PRESERVE);
+ aml_append(field, aml_named_field("HDLE",
+ sizeof(dsm_buf->handle) * BITS_PER_BYTE));
+ aml_append(field, aml_named_field("ARG0",
+ sizeof(dsm_buf->arg0) * BITS_PER_BYTE));
+ aml_append(field, aml_named_field("ARG1",
+ sizeof(dsm_buf->arg1) * BITS_PER_BYTE));
+ aml_append(field, aml_named_field("ARG2",
+ sizeof(dsm_buf->arg2) * BITS_PER_BYTE));
+ aml_append(field, aml_named_field("ARG3",
+ sizeof(dsm_buf->arg3) * BITS_PER_BYTE));
+ /*
+ * DSM input:
+ * @NOTI: write value to it will notify QEMU that _DSM method is being
+ * called and the parameters can be found in dsm_buf.
+ *
+ * It is MMIO mapping on host so that it will cause VM-exit and QEMU
+ * gets control.
+ */
+ aml_append(field, aml_named_field("NOTI",
+ sizeof(dsm_buf->notify) * BITS_PER_BYTE));
+ aml_append(dev, field);
+
+ /*
+ * DSM output:
+ * @ODAT: it resues the first page of dsm buffer and QEMU uses it to
+ * stores the result
+ *
+ * Since the first page is reused by both input and out, the input data
+ * will be lost after storing new result into @ODAT
+ */
+ field = aml_field("DSMR", AML_DWORD_ACC, AML_PRESERVE);
+ aml_append(field, aml_named_field("ODAT", PAGE_SIZE * BITS_PER_BYTE));
+ aml_append(dev, field);
+
+ BUILD_STA_METHOD(dev, method);
+
+ method = aml_method("_DSM", 4);
+ {
+ SAVE_ARG012_HANDLE(method, aml_int(0));
+ NOTIFY_AND_RETURN(method);
+ }
+ aml_append(dev, method);
+
+ build_nvdimm_devices(dev, list);
+
+ aml_append(sb_scope, dev);
+ g_slist_free(list);
+}
diff --git a/include/hw/mem/pc-nvdimm.h b/include/hw/mem/pc-nvdimm.h
index b2da8fa..b7faec3 100644
--- a/include/hw/mem/pc-nvdimm.h
+++ b/include/hw/mem/pc-nvdimm.h
@@ -14,6 +14,7 @@
#define __PC_NVDIMM_H
#include "hw/qdev.h"
+#include "hw/acpi/aml-build.h"
typedef struct PCNVDIMMDevice {
/* private */
@@ -38,4 +39,5 @@ typedef struct PCNVDIMMDevice {
void pc_nvdimm_reserve_range(ram_addr_t offset);
void pc_nvdimm_build_nfit_table(GArray *table_offsets, GArray *table_data,
GArray *linker);
+void pc_nvdimm_build_acpi_devices(Aml *sb_scope);
#endif
--
2.4.3
--
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