[PATCH v3 14/30] efi_loader: Allocate and write ACPI tables
Simon Glass
sjg at chromium.org
Thu Sep 19 15:23:02 CEST 2024
Hi Heinrich,
On Thu, 19 Sept 2024 at 14:58, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> On 12.09.24 02:58, Simon Glass wrote:
> > Hi Patrick,
> >
> > On Wed, 11 Sept 2024 at 00:25, Patrick Rudolph
> > <patrick.rudolph at 9elements.com> wrote:
> >>
> >> Allocate memory for ACPI tables inside the efi_loader and write out
> >> the tables similar to SMBIOS tables. When ACPI is enabled and wasn't
> >> installed in other places, install the ACPI table in EFI. Since EFI
> >> is necessary to pass the ACPI table location when FDT isn't used,
> >> there's no need to install it separately.
> >>
> >> When CONFIG_BLOBLIST_TABLES is set the tables will be stored in a
> >> bloblist. The tables are still passed to the OS using EFI.
> >>
> >> This allows non x86 platforms to boot using ACPI only in case the
> >> EFI loader is being used.
> >>
> >> TEST: Booted QEMU SBSA (no QFW) using EFI and ACPI only.
> >>
> >> Signed-off-by: Patrick Rudolph <patrick.rudolph at 9elements.com>
> >> Cc: Simon Glass <sjg at chromium.org>
> >> Cc: Tom Rini <trini at konsulko.com>
> >> ---
> >> Changelog v3:
> >> - Drop memalign and use efi_allocate_pages
> >> - Use log_debug instead of debug
> >> - Clarify commit message
> >> - Skip writing ACPI tables on sandbox
> >> - Rename function
> >> - Add function comment
> >> ---
> >> lib/efi_loader/efi_acpi.c | 80 +++++++++++++++++++++++++++++++-
> >> test/py/tests/test_event_dump.py | 1 +
> >> 2 files changed, 79 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/lib/efi_loader/efi_acpi.c b/lib/efi_loader/efi_acpi.c
> >> index 67bd7f8ca2..9d38d0060c 100644
> >> --- a/lib/efi_loader/efi_acpi.c
> >> +++ b/lib/efi_loader/efi_acpi.c
> >> @@ -6,15 +6,23 @@
> >> */
> >>
> >> #include <efi_loader.h>
> >> -#include <log.h>
> >> -#include <mapmem.h>
> >> #include <acpi/acpi_table.h>
> >> #include <asm/global_data.h>
> >> +#include <asm/io.h>
> >> +#include <bloblist.h>
> >> +#include <linux/sizes.h>
> >> +#include <linux/log2.h>
> >> +#include <log.h>
> >> +#include <malloc.h>
> >> +#include <mapmem.h>
> >>
> >> DECLARE_GLOBAL_DATA_PTR;
> >>
> >> static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
> >>
> >> +enum {
> >> + TABLE_SIZE = SZ_64K,
> >> +};
> >> /*
> >> * Install the ACPI table as a configuration table.
> >> *
> >> @@ -47,3 +55,71 @@ efi_status_t efi_acpi_register(void)
> >> return efi_install_configuration_table(&acpi_guid,
> >> (void *)(ulong)addr);
> >> }
> >> +
> >> +/*
> >> + * Allocate memory for ACPI tables and write ACPI tables to the
> >> + * allocated buffer.
> >> + *
> >> + * Return: status code
> >> + */
> >> +static int alloc_write_acpi_tables(void)
> >> +{
> >> + u64 table_addr, table_end;
> >> + u64 new_acpi_addr = 0;
> >> + efi_uintn_t pages;
> >> + efi_status_t ret;
> >> + void *addr;
> >> +
> >> + if (!IS_ENABLED(CONFIG_GENERATE_ACPI_TABLE))
> >> + return 0;
> >> +
> >> + if (IS_ENABLED(CONFIG_X86) ||
> >> + IS_ENABLED(CONFIG_QFW_ACPI) ||
> >> + IS_ENABLED(CONFIG_SANDBOX)) {
> >> + log_debug("Skipping writing ACPI tables as already done\n");
> >> + return 0;
> >> + }
> >> +
> >> + /* Align the table to a 4KB boundary to keep EFI happy */
> >> + if (IS_ENABLED(CONFIG_BLOBLIST_TABLES)) {
> >> + addr = bloblist_add(BLOBLISTT_ACPI_TABLES, TABLE_SIZE,
> >> + ilog2(SZ_4K));
> >> +
> >> + if (!addr)
> >> + return log_msg_ret("mem", -ENOMEM);
> >> + } else {
> >> + pages = efi_size_in_pages(TABLE_SIZE);
> >> +
> >> + ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
> >> + EFI_ACPI_RECLAIM_MEMORY,
> >> + pages, &new_acpi_addr);
> >
> > I know we are going to have a problem here since EFI memory-allocation
> > is a bit of a mess, and you got conflicting advice on the previous
> > version....
> >
> > But we cannot call efi_allocate_pages() during U-Boot init. EFI may
> > not even be enabled. The allocation ends up being in the area between
> > the bottom of memory at the bottom of the stack, which is not supposed
> > to be used, at least until images are loaded.
>
> Please, have a look at init_sequence_r[].
>
> The memory allocate for the EFI sub-system is initialized in
> efi_memory_init directly after initr_lmb.
>
> So for sure we can and should use efi_allocate_pages() here.
No, no. We need to keep the memory free for loading images. I am
working to drop all EFI allocations until an EFI app is actually
booted.
>
> We must not use bloblist_add() as the memory allocation would not be
> reported as AcpiReclaimMemory.
That is the purpose of the efi_add_memory_map() call in
lib/efi_loader/efi_acpi.c
Regards,
Simon
>
> Best regards
>
> Heinrich
>
> >
> > I think in fact we should make this ACPI stuff depend on bloblist and
> > just put the tables there. So set up bloblist size to something small,
> > like 0x100 and set BLOBLIST_SIZE_RELOC to larger than you need (e.g.
> > 68KB). Everything should work OK. I will do a bit of a tidy-up after
> > this series goes in.
> >
> >> + if (ret != EFI_SUCCESS)
> >> + return log_msg_ret("mem", -ENOMEM);
> >> +
> >> + addr = (void *)(uintptr_t)new_acpi_addr;
> >> + }
> >> +
> >> + table_addr = virt_to_phys(addr);
> >> +
> >> + gd->arch.table_start_high = table_addr;
> >> +
> >> + table_end = write_acpi_tables(table_addr);
> >> + if (!table_end) {
> >> + log_err("Can't create ACPI configuration table\n");
> >> + return -EINTR;
> >> + }
> >> +
> >> + log_debug("- wrote 'acpi' to %llx, end %llx\n", table_addr, table_end);
> >> + if (table_end - table_addr > TABLE_SIZE) {
> >> + log_err("Out of space for configuration tables: need %llx, have %x\n",
> >> + table_end - table_addr, TABLE_SIZE);
> >> + return log_msg_ret("acpi", -ENOSPC);
> >> + }
> >> + gd->arch.table_end_high = table_end;
> >> +
> >> + log_debug("- done writing tables\n");
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +EVENT_SPY_SIMPLE(EVT_LAST_STAGE_INIT, alloc_write_acpi_tables);
> >> diff --git a/test/py/tests/test_event_dump.py b/test/py/tests/test_event_dump.py
> >> index e282c67335..459bfa26bb 100644
> >> --- a/test/py/tests/test_event_dump.py
> >> +++ b/test/py/tests/test_event_dump.py
> >> @@ -18,6 +18,7 @@ def test_event_dump(u_boot_console):
> >> -------------------- ------------------------------ ------------------------------
> >> EVT_FT_FIXUP bootmeth_vbe_ft_fixup .*boot/vbe_request.c:.*
> >> EVT_FT_FIXUP bootmeth_vbe_simple_ft_fixup .*boot/vbe_simple_os.c:.*
> >> +EVT_LAST_STAGE_INIT alloc_write_acpi_tables .*lib/efi_loader/efi_acpi.c:.*
> >> EVT_LAST_STAGE_INIT install_smbios_table .*lib/efi_loader/efi_smbios.c:.*
> >> EVT_MISC_INIT_F sandbox_early_getopt_check .*arch/sandbox/cpu/start.c:.*
> >> EVT_TEST h_adder_simple .*test/common/event.c:'''
> >> --
> >> 2.46.0
> >>
> >
> > Regards,
> > Simon
>
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