The main code change over v12 is to fix the build error when
CONFIG_FORCE_NR_CPUS is present.
The commit message for removing initial stack has also been improved, typos
have been fixed and extra comments have been added to make code clearer.
Thanks,
Usama
Changes across versions:
v2: Cut it back to just INIT/SIPI/SIPI in parallel for now, nothing more
v3: Clean up x2apic patch, add MTRR optimisation, lock topology update
in preparation for more parallelisation.
v4: Fixes to the real mode parallelisation patch spotted by SeanC, to
avoid scribbling on initial_gs in common_cpu_up(), and to allow all
24 bits of the physical X2APIC ID to be used. That patch still needs
a Signed-off-by from its original author, who once claimed not to
remember writing it at all. But now we've fixed it, hopefully he'll
admit it now :)
v5: rebase to v6.1 and remeasure performance, disable parallel bringup
for AMD CPUs.
v6: rebase to v6.2-rc6, disabled parallel boot on amd as a cpu bug and
reused timer calibration for secondary CPUs.
v7: [David Woodhouse] iterate over all possible CPUs to find any existing
cluster mask in alloc_clustermask. (patch 1/9)
Keep parallel AMD support enabled in AMD, using APIC ID in CPUID leaf
0x0B (for x2APIC mode) or CPUID leaf 0x01 where 8 bits are sufficient.
Included sanity checks for APIC id from 0x0B. (patch 6/9)
Removed patch for reusing timer calibration for secondary CPUs.
commit message and code improvements.
v8: Fix CPU0 hotplug by setting up the initial_gs, initial_stack and
early_gdt_descr.
Drop trampoline lock and bail if APIC ID not found in find_cpunr.
Code comments improved and debug prints added.
v9: Drop patch to avoid repeated saves of MTRR at boot time.
rebased and retested at v6.2-rc8.
added kernel doc for no_parallel_bringup and made do_parallel_bringup
__ro_after_init.
v10: Fixed suspend/resume not working with parallel smpboot.
rebased and retested to 6.2.
fixed checkpatch errors.
v11: Added patches from Brian Gerst to remove the global variables initial_gs,
initial_stack, and early_gdt_descr from the 64-bit boot code
(https://lore.kernel.org/all/20230222221301.245890-1-brgerst@xxxxxxxxx/).
v12: Fixed compilation errors, acquire tr_lock for every stack setup in
trampoline_64.S.
Rearranged commits for a cleaner git history.
v13: Fix build error with CONFIG_FORCE_NR_CPUS.
Commit message improved, typos fixed and extra comments added.
Brian Gerst (3):
x86/smpboot: Remove initial_stack on 64-bit
x86/smpboot: Remove early_gdt_descr on 64-bit
x86/smpboot: Remove initial_gs
David Woodhouse (8):
x86/apic/x2apic: Allow CPU cluster_mask to be populated in parallel
cpu/hotplug: Move idle_thread_get() to <linux/smpboot.h>
cpu/hotplug: Add dynamic parallel bringup states before
CPUHP_BRINGUP_CPU
x86/smpboot: Reference count on smpboot_setup_warm_reset_vector()
x86/smpboot: Split up native_cpu_up into separate phases and document
them
x86/smpboot: Support parallel startup of secondary CPUs
x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel
x86/smpboot: Serialize topology updates for secondary bringup
.../admin-guide/kernel-parameters.txt | 3 +
arch/x86/include/asm/processor.h | 6 +-
arch/x86/include/asm/realmode.h | 4 +-
arch/x86/include/asm/smp.h | 15 +-
arch/x86/include/asm/topology.h | 2 -
arch/x86/kernel/acpi/sleep.c | 30 +-
arch/x86/kernel/apic/apic.c | 2 +-
arch/x86/kernel/apic/x2apic_cluster.c | 126 ++++---
arch/x86/kernel/asm-offsets.c | 1 +
arch/x86/kernel/cpu/common.c | 6 +-
arch/x86/kernel/head_64.S | 132 +++++--
arch/x86/kernel/smpboot.c | 350 +++++++++++++-----
arch/x86/realmode/init.c | 3 +
arch/x86/realmode/rm/trampoline_64.S | 27 +-
arch/x86/xen/smp_pv.c | 4 +-
arch/x86/xen/xen-head.S | 2 +-
include/linux/cpuhotplug.h | 2 +
include/linux/smpboot.h | 7 +
kernel/cpu.c | 31 +-
kernel/smpboot.h | 2 -
20 files changed, 556 insertions(+), 199 deletions(-)
--
2.25.1
