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103 lines
3.9 KiB
Diff
103 lines
3.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Patrick Steinhardt <ps@pks.im>
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Date: Thu, 21 Apr 2022 15:24:19 +1000
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Subject: [PATCH] kern/efi/mm: Always request a fixed number of pages on init
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When initializing the EFI memory subsystem, we will by default request
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a quarter of the available memory, bounded by a minimum/maximum value.
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Given that we're about to extend the EFI memory system to dynamically
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request additional pages from the firmware as required, this scaling of
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requested memory based on available memory will not make a lot of sense
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anymore.
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Remove this logic as a preparatory patch such that we'll instead defer
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to the runtime memory allocator. Note that ideally, we'd want to change
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this after dynamic requesting of pages has been implemented for the EFI
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platform. But because we'll need to split up initialization of the
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memory subsystem and the request of pages from the firmware, we'd have
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to duplicate quite some logic at first only to remove it afterwards
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again. This seems quite pointless, so we instead have patches slightly
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out of order.
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Signed-off-by: Patrick Steinhardt <ps@pks.im>
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Tested-by: Patrick Steinhardt <ps@pks.im>
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(cherry picked from commit 938c3760b8c0fca759140be48307179b50107ff6)
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---
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grub-core/kern/efi/mm.c | 35 +++--------------------------------
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1 file changed, 3 insertions(+), 32 deletions(-)
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diff --git a/grub-core/kern/efi/mm.c b/grub-core/kern/efi/mm.c
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index e460b072e6..782a1365a1 100644
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--- a/grub-core/kern/efi/mm.c
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+++ b/grub-core/kern/efi/mm.c
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@@ -38,9 +38,8 @@
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a multiplier of 4KB. */
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#define MEMORY_MAP_SIZE 0x3000
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-/* The minimum and maximum heap size for GRUB itself. */
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-#define MIN_HEAP_SIZE 0x100000
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-#define MAX_HEAP_SIZE (1600 * 0x100000)
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+/* The default heap size for GRUB itself in bytes. */
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+#define DEFAULT_HEAP_SIZE 0x100000
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static void *finish_mmap_buf = 0;
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static grub_efi_uintn_t finish_mmap_size = 0;
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@@ -514,23 +513,6 @@ filter_memory_map (grub_efi_memory_descriptor_t *memory_map,
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return filtered_desc;
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}
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-/* Return the total number of pages. */
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-static grub_efi_uint64_t
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-get_total_pages (grub_efi_memory_descriptor_t *memory_map,
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- grub_efi_uintn_t desc_size,
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- grub_efi_memory_descriptor_t *memory_map_end)
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-{
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- grub_efi_memory_descriptor_t *desc;
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- grub_efi_uint64_t total = 0;
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-
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- for (desc = memory_map;
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- desc < memory_map_end;
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- desc = NEXT_MEMORY_DESCRIPTOR (desc, desc_size))
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- total += desc->num_pages;
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-
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- return total;
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-}
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-
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/* Add memory regions. */
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static void
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add_memory_regions (grub_efi_memory_descriptor_t *memory_map,
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@@ -694,8 +676,6 @@ grub_efi_mm_init (void)
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grub_efi_memory_descriptor_t *filtered_memory_map_end;
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grub_efi_uintn_t map_size;
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grub_efi_uintn_t desc_size;
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- grub_efi_uint64_t total_pages;
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- grub_efi_uint64_t required_pages;
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int mm_status;
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grub_nx_init ();
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@@ -737,22 +717,13 @@ grub_efi_mm_init (void)
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filtered_memory_map_end = filter_memory_map (memory_map, filtered_memory_map,
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desc_size, memory_map_end);
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- /* By default, request a quarter of the available memory. */
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- total_pages = get_total_pages (filtered_memory_map, desc_size,
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- filtered_memory_map_end);
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- required_pages = (total_pages >> 2);
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- if (required_pages < BYTES_TO_PAGES (MIN_HEAP_SIZE))
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- required_pages = BYTES_TO_PAGES (MIN_HEAP_SIZE);
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- else if (required_pages > BYTES_TO_PAGES (MAX_HEAP_SIZE))
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- required_pages = BYTES_TO_PAGES (MAX_HEAP_SIZE);
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-
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/* Sort the filtered descriptors, so that GRUB can allocate pages
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from smaller regions. */
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sort_memory_map (filtered_memory_map, desc_size, filtered_memory_map_end);
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/* Allocate memory regions for GRUB's memory management. */
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add_memory_regions (filtered_memory_map, desc_size,
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- filtered_memory_map_end, required_pages);
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+ filtered_memory_map_end, BYTES_TO_PAGES (DEFAULT_HEAP_SIZE));
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#if 0
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/* For debug. */
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