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| author | Ritesh Harjani (IBM) <ritesh.list@gmail.com> | 2024-10-18 22:59:53 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-10-23 18:53:20 +1100 |
| commit | 8846d9683884fa9ef5bb160011a748701216e186 (patch) | |
| tree | 226b2c90f695b14ea421064e9a05458a06285b36 /arch/powerpc/mm | |
| parent | 76b7d6463fc504ac266472f5948b83902dfca4c6 (diff) | |
| download | linux-stable-8846d9683884fa9ef5bb160011a748701216e186.tar.gz linux-stable-8846d9683884fa9ef5bb160011a748701216e186.tar.bz2 linux-stable-8846d9683884fa9ef5bb160011a748701216e186.zip | |
book3s64/hash: Early detect debug_pagealloc size requirement
Add hash_supports_debug_pagealloc() helper to detect whether
debug_pagealloc can be supported on hash or not. This checks for both,
whether debug_pagealloc config is enabled and the linear map should
fit within rma_size/4 region size.
This can then be used early during htab_init_page_sizes() to decide
linear map pagesize if hash supports either debug_pagealloc or
kfence.
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/c33c6691b2a2cf619cc74ac100118ca4dbf21a48.1729271995.git.ritesh.list@gmail.com
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_utils.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index d6683903fefb..db87c2cc2fb6 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -329,25 +329,26 @@ static void kernel_unmap_linear_page(unsigned long vaddr, unsigned long idx, } #endif +static inline bool hash_supports_debug_pagealloc(void) +{ + unsigned long max_hash_count = ppc64_rma_size / 4; + unsigned long linear_map_count = memblock_end_of_DRAM() >> PAGE_SHIFT; + + if (!debug_pagealloc_enabled() || linear_map_count > max_hash_count) + return false; + return true; +} + #ifdef CONFIG_DEBUG_PAGEALLOC static u8 *linear_map_hash_slots; static unsigned long linear_map_hash_count; static DEFINE_RAW_SPINLOCK(linear_map_hash_lock); static void hash_debug_pagealloc_alloc_slots(void) { - unsigned long max_hash_count = ppc64_rma_size / 4; - - if (!debug_pagealloc_enabled()) - return; - linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT; - if (unlikely(linear_map_hash_count > max_hash_count)) { - pr_info("linear map size (%llu) greater than 4 times RMA region (%llu). Disabling debug_pagealloc\n", - ((u64)linear_map_hash_count << PAGE_SHIFT), - ppc64_rma_size); - linear_map_hash_count = 0; + if (!hash_supports_debug_pagealloc()) return; - } + linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT; linear_map_hash_slots = memblock_alloc_try_nid( linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT, ppc64_rma_size, NUMA_NO_NODE); @@ -1076,7 +1077,7 @@ static void __init htab_init_page_sizes(void) bool aligned = true; init_hpte_page_sizes(); - if (!debug_pagealloc_enabled() && !kfence_early_init_enabled()) { + if (!hash_supports_debug_pagealloc() && !kfence_early_init_enabled()) { /* * Pick a size for the linear mapping. Currently, we only * support 16M, 1M and 4K which is the default |