linux/arch/powerpc
Laurent Dufour d144f4d5a8 pseries/drmem: update LMBs after LPM
After a LPM, the device tree node ibm,dynamic-reconfiguration-memory may be
updated by the hypervisor in the case the NUMA topology of the LPAR's
memory is updated.

This is handled by the kernel, but the memory's node is not updated because
there is no way to move a memory block between nodes from the Linux kernel
point of view.

If later a memory block is added or removed, drmem_update_dt() is called
and it is overwriting the DT node ibm,dynamic-reconfiguration-memory to
match the added or removed LMB. But the LMB's associativity node has not
been updated after the DT node update and thus the node is overwritten by
the Linux's topology instead of the hypervisor one.

Introduce a hook called when the ibm,dynamic-reconfiguration-memory node is
updated to force an update of the LMB's associativity. However, ignore the
call to that hook when the update has been triggered by drmem_update_dt().
Because, in that case, the LMB tree has been used to set the DT property
and thus it doesn't need to be updated back. Since drmem_update_dt() is
called under the protection of the device_hotplug_lock and the hook is
called in the same context, use a simple boolean variable to detect that
call.

Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210517090606.56930-1-ldufour@linux.ibm.com
2021-08-10 23:14:55 +10:00
..
boot powerpc: move the install rule to arch/powerpc/Makefile 2021-08-04 10:53:39 +10:00
configs TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include pseries/drmem: update LMBs after LPM 2021-08-10 23:14:55 +10:00
kernel powerpc/smp: Use existing L2 cache_map cpumask to find L3 cache siblings 2021-08-04 10:53:39 +10:00
kexec powerpc/kexec: blacklist functions called in real mode for kprobe 2021-07-26 20:38:51 +10:00
kvm KVM: PPC: Book3S HV Nested: Sanitise H_ENTER_NESTED TM state 2021-07-23 16:19:38 +10:00
lib powerpc: Only build restart_table.c for 64s 2021-07-01 22:50:54 +10:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm pseries/drmem: update LMBs after LPM 2021-08-10 23:14:55 +10:00
net powerpc/bpf: Reject atomic ops in ppc32 JIT 2021-07-05 22:23:25 +10:00
perf powerpc/64s/perf: Always use SIAR for kernel interrupts 2021-08-04 10:53:39 +10:00
platforms pseries/drmem: update LMBs after LPM 2021-08-10 23:14:55 +10:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xive: Fix error handling when allocating an IPI 2021-07-05 22:23:25 +10:00
tools powerpc/tools: Remove 90 line limit in checkpatch script 2020-09-08 22:57:11 +10:00
xmon powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
Kbuild
Kconfig powerpc updates for 5.14 2021-07-02 12:54:34 -07:00
Kconfig.debug powerpc: Make PPC_IRQ_SOFT_MASK_DEBUG depend on PPC64 2021-06-25 00:07:09 +10:00
Makefile powerpc: move the install rule to arch/powerpc/Makefile 2021-08-04 10:53:39 +10:00
Makefile.postlink powerpc: unrel_branch_check.sh: use nm to find symbol value 2020-09-02 11:00:22 +10:00