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book3s64/hash: Early detect debug_pagealloc size requirement

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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
This commit is contained in:
Ritesh Harjani (IBM)
2024-10-23 18:53:20 +11:00
committed by Michael Ellerman
parent 76b7d6463f
commit 8846d96838
1 changed files with 13 additions and 12 deletions
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arch/powerpc/mm/book3s64/hash_utils.c
+13 -12
View File
@@ -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())
if (!hash_supports_debug_pagealloc())
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;
return;
}
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