diff options
| author | Haren Myneni <haren@linux.ibm.com> | 2024-08-21 19:50:27 -0700 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-08-30 21:31:25 +1000 |
| commit | 17a51171c20d590d3d3c632bcdd946f5fc3c0061 (patch) | |
| tree | b0eb47fef76219dc09b2108ce084e00628610e21 /arch/powerpc/include/asm/rtas.h | |
| parent | b76e0d4215b6b622127ebcceaa7f603313ceaec4 (diff) | |
powerpc/pseries/dlpar: Remove device tree node for DLPAR IO remove
In the powerpc-pseries specific implementation, the IO hotplug
event is handled in the user space (drmgr tool). But update the
device tree and /dev/mem access to allocate buffers for some
RTAS calls are restricted when the kernel lockdown feature is
enabled. For the DLPAR IO REMOVE, the corresponding device tree
nodes and properties have to be removed from the device tree
after the device disable. The user space removes the device tree
nodes by updating /proc/ppc64/ofdt which is not allowed under
system lockdown is enabled. This restriction can be resolved
by moving the complete IO hotplug handling in the kernel. But
the pseries implementation need user interaction to power off
and to remove device from the slot during hotplug event handling.
To overcome the /proc/ppc64/ofdt restriction, this patch extends
the /sys/kernel/dlpar interface and provides
‘dt remove index <drc_index>’ to the user space so that drmgr
tool can remove the corresponding device tree nodes based on DRC
index from the device tree.
Signed-off-by: Scott Cheloha <cheloha@linux.ibm.com>
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240822025028.938332-2-haren@linux.ibm.com
Diffstat (limited to 'arch/powerpc/include/asm/rtas.h')
| -rw-r--r-- | arch/powerpc/include/asm/rtas.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 065ffd1b2f8ad..04406162fc5ac 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -397,6 +397,7 @@ inline uint16_t pseries_errorlog_length(struct pseries_errorlog *sect) #define PSERIES_HP_ELOG_RESOURCE_SLOT 3 #define PSERIES_HP_ELOG_RESOURCE_PHB 4 #define PSERIES_HP_ELOG_RESOURCE_PMEM 6 +#define PSERIES_HP_ELOG_RESOURCE_DT 7 #define PSERIES_HP_ELOG_ACTION_ADD 1 #define PSERIES_HP_ELOG_ACTION_REMOVE 2 |