[Qemu-devel] [PATCH 2/3] nvdimm, acpi: add NFIT platform capabilities

[Ross Zwisler]

Add support for the NFIT Platform Capabilities Structure, newly added in
ACPI 6.2 Errata A.

Signed-off-by: Ross Zwisler <address@hidden>
---
 hw/acpi/nvdimm.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index 59d6e4254c..859b390e07 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -169,6 +169,21 @@ struct NvdimmNfitControlRegion {
 } QEMU_PACKED;
 typedef struct NvdimmNfitControlRegion NvdimmNfitControlRegion;
 
+/*
+ * NVDIMM Platform Capabilities Structure
+ *
+ * Defined in section 5.2.25.9 of ACPI 6.2 Errata A, September 2017
+ */
+struct NvdimmNfitPlatformCaps {
+    uint16_t type;
+    uint16_t length;
+    uint8_t highest_cap;
+    uint8_t reserved[3];
+    uint32_t capabilities;
+    uint8_t reserved2[4];
+} QEMU_PACKED;
+typedef struct NvdimmNfitPlatformCaps NvdimmNfitPlatformCaps;
+
 /*
  * Module serial number is a unique number for each device. We use the
  * slot id of NVDIMM device to generate this number so that each device
@@ -351,6 +366,21 @@ static void nvdimm_build_structure_dcr(GArray *structures, 
DeviceState *dev)
                                          JEDEC Annex L Release 3. */);
 }
 
+/*
+ * ACPI 6.2 Errata A: 5.2.25.9 NVDIMM Platform Capabilities Structure
+ */
+static void
+nvdimm_build_structure_caps(GArray *structures)
+{
+    NvdimmNfitPlatformCaps *nfit_caps;
+
+    nfit_caps = acpi_data_push(structures, sizeof(*nfit_caps));
+
+    nfit_caps->type = cpu_to_le16(7 /* NVDIMM Platform Capabilities */);
+    nfit_caps->length = cpu_to_le16(sizeof(*nfit_caps));
+    nfit_caps->highest_cap = 1;
+    nfit_caps->capabilities = cpu_to_le32(2 /* memory controller */);
+}
 static GArray *nvdimm_build_device_structure(void)
 {
     GSList *device_list = nvdimm_get_device_list();
@@ -373,6 +403,8 @@ static GArray *nvdimm_build_device_structure(void)
     }
     g_slist_free(device_list);
 
+    nvdimm_build_structure_caps(structures);
+
     return structures;
 }
 
-- 
2.14.3