Function 4 is used to get Namespace label size
Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
hw/acpi/nvdimm.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 86 insertions(+), 1 deletion(-)
diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index 8efa640..72203d2 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -407,15 +407,48 @@ enum {
NVDIMM_DSM_DEV_STATUS_VENDOR_SPECIFIC_ERROR = 4,
};
+struct nvdimm_func_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 nvdimm_func_in_get_label_data nvdimm_func_in_get_label_data;
+
+struct nvdimm_func_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 nvdimm_func_in_set_label_data nvdimm_func_in_set_label_data;
+
struct nvdimm_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];
+ nvdimm_func_in_set_label_data func_set_label_data;
+ };
} QEMU_PACKED;
typedef struct nvdimm_dsm_in nvdimm_dsm_in;
+struct nvdimm_func_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 nvdimm_func_out_label_size nvdimm_func_out_label_size;
+
+struct nvdimm_func_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 nvdimm_func_out_get_label_data nvdimm_func_out_get_label_data;
+
static void nvdimm_dsm_write_status(GArray *out, uint32_t status)
{
status = cpu_to_le32(status);
@@ -445,6 +478,55 @@ static void nvdimm_dsm_root(nvdimm_dsm_in *in, GArray *out)
nvdimm_dsm_write_status(out, status);
}
+/*
+ * the max transfer size is the max size transferred by both a
+ * 'Get Namespace Label Data' function and a 'Set Namespace Label Data'
+ * function.
+ */
+static uint32_t nvdimm_get_max_xfer_label_size(void)
+{
+ nvdimm_dsm_in *in;
+ 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 'Get Namespace Label Data' function.
+ */
+ max_get_size = dsm_memory_size - sizeof(nvdimm_func_out_get_label_data);
+
+ /*
+ * the max data ACPI can write one time which is transferred by
+ * 'Set Namespace Label Data' function.
+ */
+ max_set_size = dsm_memory_size - offsetof(nvdimm_dsm_in, arg3) -
+ sizeof(in->func_set_label_data);
+
+ return MIN(max_get_size, max_set_size);
+}
+
+/*
+ * DSM Spec Rev1 4.4 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)
+{
+ nvdimm_func_out_label_size func_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);
+
+ func_label_size.status = cpu_to_le32(NVDIMM_DSM_STATUS_SUCCESS);
+ func_label_size.label_size = cpu_to_le32(label_size);
+ func_label_size.max_xfer = cpu_to_le32(mxfer);
+
+ g_array_append_vals(out, &func_label_size, sizeof(func_label_size));
+}
+
static void nvdimm_dsm_device(nvdimm_dsm_in *in, GArray *out)
{
GSList *list = nvdimm_get_plugged_device_list();
@@ -469,6 +551,9 @@ static void nvdimm_dsm_device(nvdimm_dsm_in *in, GArray *out)
1 << 6 /* Set Namespace Label Data */);
build_append_int_noprefix(out, cmd_list, sizeof(cmd_list));
goto free;
+ case 0x4 /* Get Namespace Label Size */:
+ nvdimm_dsm_func_label_size(nvdimm, out);
+ goto free;
default:
status = NVDIMM_DSM_STATUS_NOT_SUPPORTED;
};
--
1.8.3.1
--
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