From 943db62c316c578f8e2cc6fb81a5f641096b29bf Mon Sep 17 00:00:00 2001 From: Nathan Fontenot Date: Wed, 15 Feb 2017 13:45:30 -0500 Subject: [PATCH] powerpc/pseries: Revert 'Auto-online hotplugged memory' This reverts commit ec999072442a ("powerpc/pseries: Auto-online hotplugged memory"), and 9dc512819e4b ("powerpc: Fix unused function warning 'lmb_to_memblock'"). Using the auto-online acpability does online added memory but does not update the associated device struct to indicate that the memory is online. This causes the pseries memory DLPAR code to fail when trying to remove a LMB that was previously removed and added back. This happens when validating that the LMB is removable. This patch reverts to the previous behavior of calling device_online() to online the LMB when it is DLPAR added and moves the lmb_to_memblock() routine out of CONFIG_MEMORY_HOTREMOVE now that we call it for add. Fixes: ec999072442a ("powerpc/pseries: Auto-online hotplugged memory") Cc: stable@vger.kernel.org # v4.8+ Signed-off-by: Nathan Fontenot Signed-off-by: Michael Ellerman --- arch/powerpc/configs/pseries_defconfig | 1 - arch/powerpc/platforms/pseries/hotplug-memory.c | 52 ++++++++++++++++++------- 2 files changed, 37 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/configs/pseries_defconfig b/arch/powerpc/configs/pseries_defconfig index 6d0eb02..4ff68b7 100644 --- a/arch/powerpc/configs/pseries_defconfig +++ b/arch/powerpc/configs/pseries_defconfig @@ -58,7 +58,6 @@ CONFIG_KEXEC_FILE=y CONFIG_IRQ_ALL_CPUS=y CONFIG_MEMORY_HOTPLUG=y CONFIG_MEMORY_HOTREMOVE=y -CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y CONFIG_KSM=y CONFIG_TRANSPARENT_HUGEPAGE=y CONFIG_PPC_64K_PAGES=y diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index e28abfa..e104c71 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -320,6 +320,19 @@ static int dlpar_remove_device_tree_lmb(struct of_drconf_cell *lmb) return dlpar_update_device_tree_lmb(lmb); } +static struct memory_block *lmb_to_memblock(struct of_drconf_cell *lmb) +{ + unsigned long section_nr; + struct mem_section *mem_sect; + struct memory_block *mem_block; + + section_nr = pfn_to_section_nr(PFN_DOWN(lmb->base_addr)); + mem_sect = __nr_to_section(section_nr); + + mem_block = find_memory_block(mem_sect); + return mem_block; +} + #ifdef CONFIG_MEMORY_HOTREMOVE static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) { @@ -407,19 +420,6 @@ static bool lmb_is_removable(struct of_drconf_cell *lmb) static int dlpar_add_lmb(struct of_drconf_cell *); -static struct memory_block *lmb_to_memblock(struct of_drconf_cell *lmb) -{ - unsigned long section_nr; - struct mem_section *mem_sect; - struct memory_block *mem_block; - - section_nr = pfn_to_section_nr(PFN_DOWN(lmb->base_addr)); - mem_sect = __nr_to_section(section_nr); - - mem_block = find_memory_block(mem_sect); - return mem_block; -} - static int dlpar_remove_lmb(struct of_drconf_cell *lmb) { struct memory_block *mem_block; @@ -728,6 +728,20 @@ static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index, } #endif /* CONFIG_MEMORY_HOTREMOVE */ +static int dlpar_online_lmb(struct of_drconf_cell *lmb) +{ + struct memory_block *mem_block; + int rc; + + mem_block = lmb_to_memblock(lmb); + if (!mem_block) + return -EINVAL; + + rc = device_online(&mem_block->dev); + put_device(&mem_block->dev); + return rc; +} + static int dlpar_add_lmb(struct of_drconf_cell *lmb) { unsigned long block_sz; @@ -751,10 +765,18 @@ static int dlpar_add_lmb(struct of_drconf_cell *lmb) /* Add the memory */ rc = add_memory(nid, lmb->base_addr, block_sz); - if (rc) + if (rc) { dlpar_remove_device_tree_lmb(lmb); - else + return rc; + } + + rc = dlpar_online_lmb(lmb); + if (rc) { + remove_memory(nid, lmb->base_addr, block_sz); + dlpar_remove_device_tree_lmb(lmb); + } else { lmb->flags |= DRCONF_MEM_ASSIGNED; + } return rc; } -- 2.7.4