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hw/arm/aspeed: add a 'execute-in-place' property to boot directly from CE0

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The overhead for the OpenBMC firmware images using the a custom U-Boot
is around 2 seconds, which is fine, but with a U-Boot from mainline,
it takes an extra 50 seconds or so to reach Linux. A quick survey on
the number of reads performed on the flash memory region gives the
following figures :

  OpenBMC U-Boot      922478 (~ 3.5 MBytes)
  Mainline U-Boot   20569977 (~ 80  MBytes)

QEMU must be trashing the TCG TBs and reloading text very often. Some
addresses are read more than 250.000 times. Until we find a solution
to improve boot time, execution from MMIO is not activated by default.

Setting this option also breaks migration compatibility.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200114103433.30534-5-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Cédric Le Goater 2020-01-30 16:02:02 +00:00 committed by Peter Maydell
parent 55efb36519
commit 1a15311a12
2 changed files with 41 additions and 5 deletions
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34
hw/arm/aspeed.c
View File

@ -261,12 +261,19 @@ static void aspeed_machine_init(MachineState *machine)
* SoC and 128MB for the AST2500 SoC, which is twice as big as
* needed by the flash modules of the Aspeed machines.
*/
if (ASPEED_MACHINE(machine)->mmio_exec) {
memory_region_init_alias(boot_rom, OBJECT(bmc), "aspeed.boot_rom",
&fl->mmio, 0, fl->size);
memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
boot_rom);
} else {
memory_region_init_rom(boot_rom, OBJECT(bmc), "aspeed.boot_rom",
fl->size, &error_abort);
memory_region_add_subregion(get_system_memory(), FIRMWARE_ADDR,
boot_rom);
write_boot_rom(drive0, FIRMWARE_ADDR, fl->size, &error_abort);
}
}
aspeed_board_binfo.ram_size = ram_size;
aspeed_board_binfo.loader_start = sc->memmap[ASPEED_SDRAM];
@ -399,6 +406,30 @@ static void witherspoon_bmc_i2c_init(AspeedBoardState *bmc)
/* Bus 11: TODO ucd90160@64 */
}
static bool aspeed_get_mmio_exec(Object *obj, Error **errp)
{
return ASPEED_MACHINE(obj)->mmio_exec;
}
static void aspeed_set_mmio_exec(Object *obj, bool value, Error **errp)
{
ASPEED_MACHINE(obj)->mmio_exec = value;
}
static void aspeed_machine_instance_init(Object *obj)
{
ASPEED_MACHINE(obj)->mmio_exec = false;
}
static void aspeed_machine_class_props_init(ObjectClass *oc)
{
object_class_property_add_bool(oc, "execute-in-place",
aspeed_get_mmio_exec,
aspeed_set_mmio_exec, &error_abort);
object_class_property_set_description(oc, "execute-in-place",
"boot directly from CE0 flash device", &error_abort);
}
static void aspeed_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@ -408,6 +439,8 @@ static void aspeed_machine_class_init(ObjectClass *oc, void *data)
mc->no_floppy = 1;
mc->no_cdrom = 1;
mc->no_parallel = 1;
aspeed_machine_class_props_init(oc);
}
static void aspeed_machine_palmetto_class_init(ObjectClass *oc, void *data)
@ -550,6 +583,7 @@ static const TypeInfo aspeed_machine_types[] = {
.name = TYPE_ASPEED_MACHINE,
.parent = TYPE_MACHINE,
.instance_size = sizeof(AspeedMachine),
.instance_init = aspeed_machine_instance_init,
.class_size = sizeof(AspeedMachineClass),
.class_init = aspeed_machine_class_init,
.abstract = true,

2
include/hw/arm/aspeed.h
View File

@ -19,6 +19,8 @@ typedef struct AspeedBoardState AspeedBoardState;
typedef struct AspeedMachine {
MachineState parent_obj;
bool mmio_exec;
} AspeedMachine;
#define ASPEED_MACHINE_CLASS(klass) \