Hi all,
This is v2 of the rfc [0]
The LMB subsystem was used opportunistically for a number of years. A while back Sughosh merged it with the EFI subsystem in order to have a common allocator and avoid subsystems overwriting memory they shouldn't.
This is an initial cleanup of all the crud we gathered over the years. There's no functional change expected from the patches as they just cleanup some abstraction functions and rename a few variables to make more sense.
I plan to make even bigger changes -- e.g I don't see the point of having *_alloc() and *_reserve() versions of the functions since they do the same thing and just cause confusion. lmb_alloc_addr_flags() returning the base address on success makes little sense since we already *request* the address on the function arguments, etc. Since this patchset grew enough already, I'd like to get it in before more refactoring happens.
It's worth noting that although some patches slightly increase the code size due to an extra flags argument being carried around, the final result is eventually smaller.
# qemu_arm64_lwip_defconfig (version string adds another 20b) add/remove: 0/5 grow/shrink: 15/1 up/down: 568/-628 (-60) Function old new delta lmb_alloc_base 80 324 +244 lmb_alloc_addr 8 144 +136 lmb_reserve 8 96 +88 version_string 50 70 +20 boot_relocate_fdt 488 508 +20 boot_ramdisk_high 268 284 +16 lmb_add_region_flags 696 704 +8 boot_fdt_reserve_region 100 108 +8 load_serial 548 552 +4 lmb_alloc 8 12 +4 image_setup_libfdt 368 372 +4 do_load 728 732 +4 do_bootz 332 336 +4 do_booti 520 524 +4 bootm_run_states 2176 2180 +4 lmb_alloc_addr_flags 4 - -4 boot_fdt_add_mem_rsv_regions 284 280 -4 lmb_alloc_base_flags 76 - -76 lmb_reserve_flags 96 - -96 _lmb_alloc_addr 144 - -144 _lmb_alloc_base 304 - -304 Total: Before=1020102, After=1020042, chg -0.01%
# sandbox_defconfig (version string adds another 20b) add/remove: 0/3 grow/shrink: 24/3 up/down: 523/-501 (22) Function old new delta lmb_alloc_base 48 299 +251 lmb_alloc_addr 4 92 +88 lmb_reserve 4 58 +54 test_alloc_addr 2933 2963 +30 version_string 50 70 +20 lib_test_lmb_overlapping_reserve 1018 1030 +12 lmb_add_region_flags 600 610 +10 test_multi_alloc.constprop 3034 3042 +8 test_get_unreserved_size 1032 1038 +6 boot_relocate_fdt 599 605 +6 boot_fdt_reserve_region 67 73 +6 lmb_alloc 4 9 +5 lmb_free_flags 190 194 +4 wget_handler 1530 1533 +3 tftp_handler 1190 1192 +2 test_noreserved 1207 1209 +2 test_bigblock 911 913 +2 load_serial 946 948 +2 lib_test_lmb_flags 2101 2103 +2 do_spi_flash 3150 3152 +2 do_bootz 526 528 +2 do_bootm_linux 2067 2069 +2 bootm_run_states 5275 5277 +2 _fs_read.lto_priv 331 333 +2 lmb_dump_region.lto_priv 356 353 -3 lmb_add 59 52 -7 efi_allocate_pages.part 303 249 -54 lmb_reserve_flags 65 - -65 _lmb_alloc_addr.lto_priv 92 - -92 _lmb_alloc_base.lto_priv 280 - -280 Total: Before=2492722, After=2492744, chg +0.00%
[0] https://lore.kernel.org/u-boot/20241208105223.2821049-1-ilias.apalodimas@lin...
Changes since v1: - Picked up r-b and t-b tags - Fixed comments for LMB_NONE etc so doc generation works properly
Changes since RFC: - Rebased on top of https://lore.kernel.org/u-boot/20241211021703.2333-1-semen.protsenko@linaro.... https://lore.kernel.org/u-boot/20241211022550.2995-1-semen.protsenko@linaro.... - Converted enum lmb_flags to a u32 - Removed the _flags from all the functions - Added a patch that removes lmb_align_down() - Picked up r-b tags. Tom I kept your on patch #3 since I only changed the name of the function and assumed you are ok with it.
Ilias Apalodimas (8): lmb: Remove lmb_align_down() lmb: Move enum lmb_flags to a u32 lmb: Remove lmb_reserve_flags() lmb: Rename free_mem to available_mem lmb: Remove lmb_add_region() lmb: Remove lmb_alloc_addr_flags() lmb: Remove lmb_alloc_base_flags() lmb: Rename _lmb_alloc_addr() to lmb_alloc_addr_flags()
arch/powerpc/cpu/mpc85xx/mp.c | 2 +- arch/powerpc/lib/misc.c | 2 +- boot/bootm.c | 3 +- boot/image-board.c | 20 +++-- boot/image-fdt.c | 15 ++-- cmd/booti.c | 2 +- cmd/bootz.c | 2 +- cmd/load.c | 2 +- fs/fs.c | 2 +- include/lmb.h | 60 ++++++--------- lib/efi_loader/efi_memory.c | 6 +- lib/lmb.c | 136 +++++++++++----------------------- test/cmd/bdinfo.c | 4 +- test/lib/lmb.c | 92 +++++++++++------------ 14 files changed, 147 insertions(+), 201 deletions(-)
-- 2.45.2