Function 4 is used to get Namespace label size
Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
hw/acpi/nvdimm.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 95 insertions(+), 2 deletions(-)
diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index 37fea1c..1274d95 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -481,12 +481,28 @@ enum {
| (1 << DSM_DEV_FUN_GET_NAMESPACE_LABEL_DATA) \
| (1 << DSM_DEV_FUN_SET_NAMESPACE_LABEL_DATA))
+struct cmd_in_get_label_data {
+ uint32_t offset; /* the offset in the namespace label data area. */
+ uint32_t length; /* the size of data is to be read via the function. */
+} QEMU_PACKED;
+typedef struct cmd_in_get_label_data cmd_in_get_label_data;
+
+struct cmd_in_set_label_data {
+ uint32_t offset; /* the offset in the namespace label data area. */
+ uint32_t length; /* the size of data is to be written via the function. */
+ uint8_t in_buf[0]; /* the data written to label data area. */
+} QEMU_PACKED;
+typedef struct cmd_in_set_label_data cmd_in_set_label_data;
+
struct dsm_in {
uint32_t handle;
uint32_t revision;
uint32_t function;
/* the remaining size in the page is used by arg3. */
- uint8_t arg3[0];
+ union {
+ uint8_t arg3[0];
+ cmd_in_set_label_data cmd_set_label_data;
+ };
} QEMU_PACKED;
typedef struct dsm_in dsm_in;
@@ -495,10 +511,32 @@ struct cmd_out_implemented {
};
typedef struct cmd_out_implemented cmd_out_implemented;
+struct cmd_out_label_size {
+ uint32_t status; /* return status code. */
+ uint32_t label_size; /* the size of label data area. */
+ /*
+ * Maximum size of the namespace label data length supported by
+ * the platform in Get/Set Namespace Label Data functions.
+ */
+ uint32_t max_xfer;
+} QEMU_PACKED;
+typedef struct cmd_out_label_size cmd_out_label_size;
+
+struct cmd_out_get_label_data {
+ uint32_t status; /*return status code. */
+ uint8_t out_buf[0]; /* the data got via Get Namesapce Label function. */
+} QEMU_PACKED;
+typedef struct cmd_out_get_label_data cmd_out_get_label_data;
+
struct dsm_out {
/* the size of buffer filled by QEMU. */
uint32_t len;
- uint8_t data[0];
+ union {
+ uint8_t data[0];
+ cmd_out_implemented cmd_implemented;
+ cmd_out_label_size cmd_label_size;
+ cmd_out_get_label_data cmd_get_label_data;
+ };
} QEMU_PACKED;
typedef struct dsm_out dsm_out;
@@ -534,6 +572,58 @@ static void nvdimm_dsm_write_root(dsm_in *in, GArray *out)
nvdimm_dsm_write_status(out, status);
}
+/*
+ * the max transfer size is the max size transferred by both a
+ * DSM_DEV_FUN_GET_NAMESPACE_LABEL_DATA and a
+ * DSM_DEV_FUN_SET_NAMESPACE_LABEL_DATA command.
+ */
+static uint32_t nvdimm_get_max_xfer_label_size(void)
+{
+ dsm_in *in;
+ dsm_out *out;
+ uint32_t max_get_size, max_set_size, dsm_memory_size = getpagesize();
+
+ /*
+ * the max data ACPI can read one time which is transferred by
+ * the response of DSM_DEV_FUN_GET_NAMESPACE_LABEL_DATA.
+ */
+ max_get_size = dsm_memory_size - offsetof(dsm_out, data) -
+ sizeof(out->cmd_get_label_data);
+
+ /*
+ * the max data ACPI can write one time which is transferred by
+ * DSM_DEV_FUN_SET_NAMESPACE_LABEL_DATA
+ */
+ max_set_size = dsm_memory_size - offsetof(dsm_in, arg3) -
+ sizeof(in->cmd_set_label_data);
+
+ return MIN(max_get_size, max_set_size);
+}
+
+/*
+ * Please refer to DSM specification 4.4.1 Get Namespace Label Size
+ * (Function Index 4).
+ *
+ * It gets the size of Namespace Label data area and the max data size
+ * that Get/Set Namespace Label Data functions can transfer.
+ */
+static void nvdimm_dsm_func_label_size(NVDIMMDevice *nvdimm, GArray *out)
+{
+ cmd_out_label_size cmd_label_size;
+ uint32_t label_size, mxfer;
+
+ label_size = nvdimm->label_size;
+ mxfer = nvdimm_get_max_xfer_label_size();
+
+ nvdimm_debug("label_size %#x, max_xfer %#x.\n", label_size, mxfer);
+
+ cmd_label_size.status = cpu_to_le32(DSM_STATUS_SUCCESS);
+ cmd_label_size.label_size = cpu_to_le32(label_size);
+ cmd_label_size.max_xfer = cpu_to_le32(mxfer);
+
+ g_array_append_vals(out, &cmd_label_size, sizeof(cmd_label_size));
+}
+
static void nvdimm_dsm_write_nvdimm(dsm_in *in, GArray *out)
{
GSList *list = nvdimm_get_plugged_device_list();
@@ -551,6 +641,9 @@ static void nvdimm_dsm_write_nvdimm(dsm_in *in, GArray *out)
cmd_list = cpu_to_le64(DIMM_SUPPORT_FUN);
g_array_append_vals(out, &cmd_list, sizeof(cmd_list));
goto free;
+ case DSM_DEV_FUN_NAMESPACE_LABEL_SIZE:
+ nvdimm_dsm_func_label_size(nvdimm, out);
+ goto free;
default:
status = DSM_STATUS_NOT_SUPPORTED;
};
--
1.8.3.1
--
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