Re: [PATCH v2 2/8] nvdimm acpi: prebuild nvdimm devices for available slots

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On 09/21/2016 07:48 PM, Igor Mammedov wrote:
On Fri, 12 Aug 2016 14:54:04 +0800
Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> wrote:

For each NVDIMM present or intended to be supported by platform,
platform firmware also exposes an ACPI Namespace Device under
the root device

So it builds nvdimm devices for all slots to support vNVDIMM hotplug

Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
 hw/acpi/nvdimm.c        | 41 ++++++++++++++++++++++++-----------------
 hw/i386/acpi-build.c    |  2 +-
 include/hw/mem/nvdimm.h |  3 ++-
 3 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
index 5454c0f..0e2b9f0 100644
--- a/hw/acpi/nvdimm.c
+++ b/hw/acpi/nvdimm.c
@@ -886,12 +886,11 @@ static void nvdimm_build_device_dsm(Aml *dev, uint32_t handle)
     aml_append(dev, method);
 }

-static void nvdimm_build_nvdimm_devices(GSList *device_list, Aml *root_dev)
+static void nvdimm_build_nvdimm_devices(Aml *root_dev, uint32_t ram_slots)
 {
-    for (; device_list; device_list = device_list->next) {
-        DeviceState *dev = device_list->data;
-        int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP,
-                                           NULL);
+    uint32_t slot;
+
+    for (slot = 0; slot < ram_slots; slot++) {
         uint32_t handle = nvdimm_slot_to_handle(slot);
         Aml *nvdimm_dev;

@@ -912,9 +911,9 @@ static void nvdimm_build_nvdimm_devices(GSList *device_list, Aml *root_dev)
     }
 }

-static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
-                              GArray *table_data, BIOSLinker *linker,
-                              GArray *dsm_dma_arrea)
+static void nvdimm_build_ssdt(GArray *table_offsets, GArray *table_data,
+                              BIOSLinker *linker, GArray *dsm_dma_arrea,
+                              uint32_t ram_slots)
 {
     Aml *ssdt, *sb_scope, *dev, *field;
     int mem_addr_offset, nvdimm_ssdt;
@@ -1003,7 +1002,7 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
     /* 0 is reserved for root device. */
     nvdimm_build_device_dsm(dev, 0);

-    nvdimm_build_nvdimm_devices(device_list, dev);
+    nvdimm_build_nvdimm_devices(dev, ram_slots);

     aml_append(sb_scope, dev);
     aml_append(ssdt, sb_scope);
@@ -1028,17 +1027,25 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
 }

 void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data,
-                       BIOSLinker *linker, GArray *dsm_dma_arrea)
+                       BIOSLinker *linker, GArray *dsm_dma_arrea,
+                       uint32_t ram_slots)
 {
     GSList *device_list;

-    /* no NVDIMM device is plugged. */
     device_list = nvdimm_get_plugged_device_list();
-    if (!device_list) {
-        return;
+
+    /* NVDIMM device is plugged. */
+    if (device_list) {
+        nvdimm_build_nfit(device_list, table_offsets, table_data, linker);
+        g_slist_free(device_list);
+    }
+
+    /*
+     * NVDIMM device is allowed to be plugged only if there has available
s/has/is/

Will fix. Thank you for pointing it out.

+     * slot.
+     */
+    if (ram_slots) {
another question:
 Is NFIT table generated above sufficient without below nvdim SSDT?

maybe you should put
  if (!ram_slots) {
    return;
  }
at the function start?


Not needed.

As the NFIT table is created only if there is nvdimm device already plugged
that means QEMU must have available ram-slots.


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