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Date: Fri, 29 Apr 2022 17:17:13 -0300
From: Martin Fernandez <martin.fernandez@...ypsium.com>
To: linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
platform-driver-x86@...r.kernel.org, linux-mm@...ck.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
ardb@...nel.org, dvhart@...radead.org, andy@...radead.org,
gregkh@...uxfoundation.org, rafael@...nel.org, rppt@...nel.org,
akpm@...ux-foundation.org, daniel.gutson@...ypsium.com,
hughsient@...il.com, alex.bazhaniuk@...ypsium.com,
alison.schofield@...el.com, keescook@...omium.org,
Martin Fernandez <martin.fernandez@...ypsium.com>
Subject: [PATCH v8 4/8] x86/e820: Refactor __e820__range_update
Refactor __e820__range_update with the introduction of
e820_type_updater_data, indented to be used as the void pointer in the
e820_entry_updater callbacks, and the implementation of the callbacks
to perform the update of the type in a range of a e820_table.
Signed-off-by: Martin Fernandez <martin.fernandez@...ypsium.com>
---
arch/x86/kernel/e820.c | 119 +++++++++++++++++++++--------------------
1 file changed, 62 insertions(+), 57 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index e0fa3ab755a5..36a22c0a2199 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -586,80 +586,85 @@ __e820__handle_range_update(struct e820_table *table,
return updated_size;
}
-static u64 __init
-__e820__range_update(struct e820_table *table, u64 start, u64 size, enum e820_type old_type, enum e820_type new_type)
-{
- u64 end;
- unsigned int i;
- u64 real_updated_size = 0;
-
- BUG_ON(old_type == new_type);
-
- if (size > (ULLONG_MAX - start))
- size = ULLONG_MAX - start;
+/*
+ * Type helper for the e820_entry_updater callbacks.
+ */
+struct e820_type_updater_data {
+ enum e820_type old_type;
+ enum e820_type new_type;
+};
- end = start + size;
- printk(KERN_DEBUG "e820: update [mem %#010Lx-%#010Lx] ", start, end - 1);
- e820_print_type(old_type);
- pr_cont(" ==> ");
- e820_print_type(new_type);
- pr_cont("\n");
+static bool __init type_updater__should_update(const struct e820_entry *entry,
+ const void *data)
+{
+ const struct e820_type_updater_data *type_updater_data = data;
- for (i = 0; i < table->nr_entries; i++) {
- struct e820_entry *entry = &table->entries[i];
- u64 final_start, final_end;
- u64 entry_end;
+ return entry->type == type_updater_data->old_type;
+}
- if (entry->type != old_type)
- continue;
+static void __init type_updater__update(struct e820_entry *entry,
+ const void *data)
+{
+ const struct e820_type_updater_data *type_updater_data = data;
- entry_end = entry->addr + entry->size;
+ entry->type = type_updater_data->new_type;
+}
- /* Completely covered by new range? */
- if (entry->addr >= start && entry_end <= end) {
- entry->type = new_type;
- real_updated_size += entry->size;
- continue;
- }
+static void __init type_updater__new(struct e820_table *table, u64 new_start,
+ u64 new_size,
+ const struct e820_entry *original,
+ const void *data)
+{
+ const struct e820_type_updater_data *type_updater_data = data;
- /* New range is completely covered? */
- if (entry->addr < start && entry_end > end) {
- __e820__range_add(table, start, size, new_type);
- __e820__range_add(table, end, entry_end - end, entry->type);
- entry->size = start - entry->addr;
- real_updated_size += size;
- continue;
- }
+ __e820__range_add(table, new_start, new_size,
+ type_updater_data->new_type);
+}
- /* Partially covered: */
- final_start = max(start, entry->addr);
- final_end = min(end, entry_end);
- if (final_start >= final_end)
- continue;
+static u64 __init __e820__range_update(struct e820_table *table, u64 start,
+ u64 size, enum e820_type old_type,
+ enum e820_type new_type)
+{
+ struct e820_entry_updater updater = {
+ .should_update = type_updater__should_update,
+ .update = type_updater__update,
+ .new = type_updater__new
+ };
- __e820__range_add(table, final_start, final_end - final_start, new_type);
+ struct e820_type_updater_data data = {
+ .old_type = old_type,
+ .new_type = new_type
+ };
- real_updated_size += final_end - final_start;
+ BUG_ON(old_type == new_type);
- /*
- * Left range could be head or tail, so need to update
- * its size first:
- */
- entry->size -= final_end - final_start;
- if (entry->addr < final_start)
- continue;
+ printk(KERN_DEBUG "e820: update [mem %#018Lx-%#018Lx] ", start,
+ start + size - 1);
+ e820_print_type(old_type);
+ pr_cont(" ==> ");
+ e820_print_type(new_type);
+ pr_cont("\n");
- entry->addr = final_end;
- }
- return real_updated_size;
+ return __e820__handle_range_update(table, start, size, &updater, &data);
}
-u64 __init e820__range_update(u64 start, u64 size, enum e820_type old_type, enum e820_type new_type)
+/*
+ * Update type of addresses in [@start, @start + @size) from @old_type
+ * to @new_type in e820_table.
+ */
+u64 __init e820__range_update(u64 start, u64 size, enum e820_type old_type,
+ enum e820_type new_type)
{
return __e820__range_update(e820_table, start, size, old_type, new_type);
}
-static u64 __init e820__range_update_kexec(u64 start, u64 size, enum e820_type old_type, enum e820_type new_type)
+/*
+ * Update type of addresses in [@start, @start + @size) from @old_type
+ * to @new_type in e820_table_kexec.
+ */
+static u64 __init e820__range_update_kexec(u64 start, u64 size,
+ enum e820_type old_type,
+ enum e820_type new_type)
{
return __e820__range_update(e820_table_kexec, start, size, old_type, new_type);
}
--
2.30.2
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