This memory range is used to transfer data between ACPI in guest and Qemu,
it occupies two pages:
- one is RAM-based used to save the input info of _DSM method and Qemu reuse
it store output info
- another one is MMIO-based, ACPI write data to this page to transfer the
control to Qemu
Signed-off-by: Xiao Guangrong guangrong.x...@linux.intel.com
---
hw/mem/nvdimm/acpi.c | 80 ++-
hw/mem/nvdimm/internal.h | 1 +
hw/mem/nvdimm/pc-nvdimm.c | 2 +-
3 files changed, 81 insertions(+), 2 deletions(-)
diff --git a/hw/mem/nvdimm/acpi.c b/hw/mem/nvdimm/acpi.c
index f28752f..e0f2ad3 100644
--- a/hw/mem/nvdimm/acpi.c
+++ b/hw/mem/nvdimm/acpi.c
@@ -28,6 +28,7 @@
#include qemu-common.h
+#include exec/address-spaces.h
#include hw/acpi/aml-build.h
#include hw/mem/pc-nvdimm.h
@@ -257,14 +258,91 @@ static void build_nfit_table(GSList *device_list, char
*buf)
}
}
+struct dsm_buffer {
+/* RAM page. */
+uint32_t handle;
+uint8_t arg0[16];
+uint32_t arg1;
+uint32_t arg2;
+union {
+char arg3[PAGE_SIZE - 3 * sizeof(uint32_t) - 16 * sizeof(uint8_t)];
+};
+
+/* MMIO page. */
+union {
+uint32_t notify;
+char pedding[PAGE_SIZE];
+};
+};
+
+static ram_addr_t dsm_addr;
+static size_t dsm_size;
+
+static uint64_t dsm_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+return 0;
+}
+
+static void dsm_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+}
+
+static const MemoryRegionOps dsm_ops = {
+.read = dsm_read,
+.write = dsm_write,
+.endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static int build_dsm_buffer(void)
+{
+MemoryRegion *dsm_ram_mr, *dsm_mmio_mr;
+ram_addr_t addr;;
+
+QEMU_BUILD_BUG_ON(PAGE_SIZE * 2 != sizeof(struct dsm_buffer));
+
+/* DSM buffer has already been built. */
+if (dsm_addr) {
+return 0;
+}
+
+addr = reserved_range_push(2 * PAGE_SIZE);
+if (!addr) {
+return -1;
+}
+
+dsm_addr = addr;
+dsm_size = PAGE_SIZE * 2;
+
+dsm_ram_mr = g_new(MemoryRegion, 1);
+memory_region_init_ram(dsm_ram_mr, NULL, dsm_ram, PAGE_SIZE,
+ error_abort);
+vmstate_register_ram_global(dsm_ram_mr);
+memory_region_add_subregion(get_system_memory(), addr, dsm_ram_mr);
+
+dsm_mmio_mr = g_new(MemoryRegion, 1);
+memory_region_init_io(dsm_mmio_mr, NULL, dsm_ops, dsm_ram_mr,
+ dsm_mmio, PAGE_SIZE);
+memory_region_add_subregion(get_system_memory(), addr + PAGE_SIZE,
+dsm_mmio_mr);
+return 0;
+}
+
void pc_nvdimm_build_nfit_table(GArray *table_offsets, GArray *table_data,
GArray *linker)
{
-GSList *list = get_nvdimm_built_list();
+GSList *list;
size_t total;
char *buf;
int nfit_start, nr;
+if (build_dsm_buffer()) {
+fprintf(stderr, do not have enough space for DSM buffer.\n);
+return;
+}
+
+list = get_nvdimm_built_list();
nr = get_nvdimm_device_number(list);
total = get_nfit_total_size(nr);
diff --git a/hw/mem/nvdimm/internal.h b/hw/mem/nvdimm/internal.h
index 252a222..90d54dc 100644
--- a/hw/mem/nvdimm/internal.h
+++ b/hw/mem/nvdimm/internal.h
@@ -26,4 +26,5 @@ typedef struct {
(d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } })
GSList *get_nvdimm_built_list(void);
+ram_addr_t reserved_range_push(uint64_t size);
#endif
diff --git a/hw/mem/nvdimm/pc-nvdimm.c b/hw/mem/nvdimm/pc-nvdimm.c
index 2a6cfa2..752842a 100644
--- a/hw/mem/nvdimm/pc-nvdimm.c
+++ b/hw/mem/nvdimm/pc-nvdimm.c
@@ -45,7 +45,7 @@ void pc_nvdimm_reserve_range(ram_addr_t offset)
nvdimms_info.current_addr = offset;
}
-static ram_addr_t reserved_range_push(uint64_t size)
+ram_addr_t reserved_range_push(uint64_t size)
{
uint64_t current;
--
2.4.3
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