loongarch: Change the UEFI loading mode to loongarch

The UEFI loading mode in loongarch is very different
from that in other architectures:loongarch's UEFI code
is in rom, while other architectures' UEFI code is in flash.

loongarch UEFI can be loaded as follows:
-machine virt,pflash=pflash0-format
-bios ./QEMU_EFI.fd

Other architectures load UEFI using the following methods:
-machine virt,pflash0=pflash0-format,pflash1=pflash1-format

loongarch's UEFI loading method makes qemu and libvirt incompatible
when using NVRAM, and the cost of loongarch's current loading method
far outweighs the benefits, so we decided to use the same UEFI loading
scheme as other architectures.

Cc: Andrea Bolognani <abologna@redhat.com>
Cc: maobibo@loongson.cn
Cc: Philippe Mathieu-Daudé <philmd@linaro.org>
Cc: Song Gao <gaosong@loongson.cn>
Cc: zhaotianrui@loongson.cn
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <0bd892aa9b88e0f4cc904cb70efd0251fc1cde29.1708336919.git.lixianglai@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

hw/loongarch/acpi-build.c

@@ -314,16 +314,39 @@ static void build_pci_device_aml(Aml *scope, LoongArchMachineState *lams)
 static void build_flash_aml(Aml *scope, LoongArchMachineState *lams)
 {
     Aml *dev, *crs;
+    MemoryRegion *flash_mem;
 
-    hwaddr flash_base = VIRT_FLASH_BASE;
-    hwaddr flash_size = VIRT_FLASH_SIZE;
+    hwaddr flash0_base;
+    hwaddr flash0_size;
+
+    hwaddr flash1_base;
+    hwaddr flash1_size;
+
+    flash_mem = pflash_cfi01_get_memory(lams->flash[0]);
+    flash0_base = flash_mem->addr;
+    flash0_size = memory_region_size(flash_mem);
+
+    flash_mem = pflash_cfi01_get_memory(lams->flash[1]);
+    flash1_base = flash_mem->addr;
+    flash1_size = memory_region_size(flash_mem);
 
     dev = aml_device("FLS0");
     aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0015")));
     aml_append(dev, aml_name_decl("_UID", aml_int(0)));
 
     crs = aml_resource_template();
-    aml_append(crs, aml_memory32_fixed(flash_base, flash_size, AML_READ_WRITE));
+    aml_append(crs, aml_memory32_fixed(flash0_base, flash0_size,
+                                       AML_READ_WRITE));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+
+    dev = aml_device("FLS1");
+    aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0015")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+
+    crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(flash1_base, flash1_size,
+                                       AML_READ_WRITE));
     aml_append(dev, aml_name_decl("_CRS", crs));
     aml_append(scope, dev);
 }

hw/loongarch/virt.c

@@ -54,7 +54,9 @@ struct loaderparams {
     const char *initrd_filename;
 };
 
-static void virt_flash_create(LoongArchMachineState *lams)
+static PFlashCFI01 *virt_flash_create1(LoongArchMachineState *lams,
+                                       const char *name,
+                                       const char *alias_prop_name)
 {
     DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01);
 
@@ -66,45 +68,78 @@ static void virt_flash_create(LoongArchMachineState *lams)
     qdev_prop_set_uint16(dev, "id1", 0x18);
     qdev_prop_set_uint16(dev, "id2", 0x00);
     qdev_prop_set_uint16(dev, "id3", 0x00);
-    qdev_prop_set_string(dev, "name", "virt.flash");
-    object_property_add_child(OBJECT(lams), "virt.flash", OBJECT(dev));
-    object_property_add_alias(OBJECT(lams), "pflash",
+    qdev_prop_set_string(dev, "name", name);
+    object_property_add_child(OBJECT(lams), name, OBJECT(dev));
+    object_property_add_alias(OBJECT(lams), alias_prop_name,
                               OBJECT(dev), "drive");
+    return PFLASH_CFI01(dev);
+}
 
-    lams->flash = PFLASH_CFI01(dev);
+static void virt_flash_create(LoongArchMachineState *lams)
+{
+    lams->flash[0] = virt_flash_create1(lams, "virt.flash0", "pflash0");
+    lams->flash[1] = virt_flash_create1(lams, "virt.flash1", "pflash1");
 }
 
-static void virt_flash_map(LoongArchMachineState *lams,
-                           MemoryRegion *sysmem)
+static void virt_flash_map1(PFlashCFI01 *flash,
+                            hwaddr base, hwaddr size,
+                            MemoryRegion *sysmem)
 {
-    PFlashCFI01 *flash = lams->flash;
     DeviceState *dev = DEVICE(flash);
-    hwaddr base = VIRT_FLASH_BASE;
-    hwaddr size = VIRT_FLASH_SIZE;
+    BlockBackend *blk;
+    hwaddr real_size = size;
+
+    blk = pflash_cfi01_get_blk(flash);
+    if (blk) {
+        real_size = blk_getlength(blk);
+        assert(real_size && real_size <= size);
+    }
 
-    assert(QEMU_IS_ALIGNED(size, VIRT_FLASH_SECTOR_SIZE));
-    assert(size / VIRT_FLASH_SECTOR_SIZE <= UINT32_MAX);
+    assert(QEMU_IS_ALIGNED(real_size, VIRT_FLASH_SECTOR_SIZE));
+    assert(real_size / VIRT_FLASH_SECTOR_SIZE <= UINT32_MAX);
 
-    qdev_prop_set_uint32(dev, "num-blocks", size / VIRT_FLASH_SECTOR_SIZE);
+    qdev_prop_set_uint32(dev, "num-blocks", real_size / VIRT_FLASH_SECTOR_SIZE);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     memory_region_add_subregion(sysmem, base,
                                 sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0));
+}
 
+static void virt_flash_map(LoongArchMachineState *lams,
+                           MemoryRegion *sysmem)
+{
+    PFlashCFI01 *flash0 = lams->flash[0];
+    PFlashCFI01 *flash1 = lams->flash[1];
+
+    virt_flash_map1(flash0, VIRT_FLASH0_BASE, VIRT_FLASH0_SIZE, sysmem);
+    virt_flash_map1(flash1, VIRT_FLASH1_BASE, VIRT_FLASH1_SIZE, sysmem);
 }
 
 static void fdt_add_flash_node(LoongArchMachineState *lams)
 {
     MachineState *ms = MACHINE(lams);
     char *nodename;
+    MemoryRegion *flash_mem;
+
+    hwaddr flash0_base;
+    hwaddr flash0_size;
 
-    hwaddr flash_base = VIRT_FLASH_BASE;
-    hwaddr flash_size = VIRT_FLASH_SIZE;
+    hwaddr flash1_base;
+    hwaddr flash1_size;
 
-    nodename = g_strdup_printf("/flash@%" PRIx64, flash_base);
+    flash_mem = pflash_cfi01_get_memory(lams->flash[0]);
+    flash0_base = flash_mem->addr;
+    flash0_size = memory_region_size(flash_mem);
+
+    flash_mem = pflash_cfi01_get_memory(lams->flash[1]);
+    flash1_base = flash_mem->addr;
+    flash1_size = memory_region_size(flash_mem);
+
+    nodename = g_strdup_printf("/flash@%" PRIx64, flash0_base);
     qemu_fdt_add_subnode(ms->fdt, nodename);
     qemu_fdt_setprop_string(ms->fdt, nodename, "compatible", "cfi-flash");
     qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg",
-                                 2, flash_base, 2, flash_size);
+                                 2, flash0_base, 2, flash0_size,
+                                 2, flash1_base, 2, flash1_size);
     qemu_fdt_setprop_cell(ms->fdt, nodename, "bank-width", 4);
     g_free(nodename);
 }
@@ -637,34 +672,48 @@ static void loongarch_firmware_init(LoongArchMachineState *lams)
 {
     char *filename = MACHINE(lams)->firmware;
     char *bios_name = NULL;
-    int bios_size;
+    int bios_size, i;
+    BlockBackend *pflash_blk0;
+    MemoryRegion *mr;
 
     lams->bios_loaded = false;
 
+    /* Map legacy -drive if=pflash to machine properties */
+    for (i = 0; i < ARRAY_SIZE(lams->flash); i++) {
+        pflash_cfi01_legacy_drive(lams->flash[i],
+                                  drive_get(IF_PFLASH, 0, i));
+    }
+
     virt_flash_map(lams, get_system_memory());
 
+    pflash_blk0 = pflash_cfi01_get_blk(lams->flash[0]);
+
+    if (pflash_blk0) {
+        if (filename) {
+            error_report("cannot use both '-bios' and '-drive if=pflash'"
+                         "options at once");
+            exit(1);
+        }
+        lams->bios_loaded = true;
+        return;
+    }
+
     if (filename) {
         bios_name = qemu_find_file(QEMU_FILE_TYPE_BIOS, filename);
         if (!bios_name) {
             error_report("Could not find ROM image '%s'", filename);
             exit(1);
         }
 
-        bios_size = load_image_targphys(bios_name, VIRT_BIOS_BASE, VIRT_BIOS_SIZE);
+        mr = sysbus_mmio_get_region(SYS_BUS_DEVICE(lams->flash[0]), 0);
+        bios_size = load_image_mr(bios_name, mr);
         if (bios_size < 0) {
             error_report("Could not load ROM image '%s'", bios_name);
             exit(1);
         }
-
         g_free(bios_name);
-
-        memory_region_init_ram(&lams->bios, NULL, "loongarch.bios",
-                               VIRT_BIOS_SIZE, &error_fatal);
-        memory_region_set_readonly(&lams->bios, true);
-        memory_region_add_subregion(get_system_memory(), VIRT_BIOS_BASE, &lams->bios);
         lams->bios_loaded = true;
     }
-
 }
 
 static void reset_load_elf(void *opaque)

include/hw/loongarch/virt.h

@@ -18,10 +18,12 @@
 
 #define VIRT_FWCFG_BASE         0x1e020000UL
 #define VIRT_BIOS_BASE          0x1c000000UL
-#define VIRT_BIOS_SIZE          (4 * MiB)
+#define VIRT_BIOS_SIZE          (16 * MiB)
 #define VIRT_FLASH_SECTOR_SIZE  (128 * KiB)
-#define VIRT_FLASH_BASE         0x1d000000UL
-#define VIRT_FLASH_SIZE         (16 * MiB)
+#define VIRT_FLASH0_BASE        VIRT_BIOS_BASE
+#define VIRT_FLASH0_SIZE        VIRT_BIOS_SIZE
+#define VIRT_FLASH1_BASE        0x1d000000UL
+#define VIRT_FLASH1_SIZE        (16 * MiB)
 
 #define VIRT_LOWMEM_BASE        0
 #define VIRT_LOWMEM_SIZE        0x10000000
@@ -49,7 +51,7 @@ struct LoongArchMachineState {
     int          fdt_size;
     DeviceState *platform_bus_dev;
     PCIBus       *pci_bus;
-    PFlashCFI01  *flash;
+    PFlashCFI01  *flash[2];
     MemoryRegion system_iocsr;
     MemoryRegion iocsr_mem;
     AddressSpace as_iocsr;