From: Dan Williams <dan.j.williams@intel.com>
To: akpm@linux-foundation.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Ard Biesheuvel <ardb@kernel.org>,
peterz@infradead.org, dave.hansen@linux.intel.com,
ard.biesheuvel@linaro.org, linux-mm@kvack.org,
linux-nvdimm@lists.01.org, joao.m.martins@oracle.com,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH v4 03/23] efi/fake_mem: Arrange for a resource entry per efi_fake_mem instance
Date: Sun, 02 Aug 2020 22:02:40 -0700 [thread overview]
Message-ID: <159643096068.4062302.11590041070221681669.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <159643094279.4062302.17779410714418721328.stgit@dwillia2-desk3.amr.corp.intel.com>
In preparation for attaching a platform device per iomem resource teach
the efi_fake_mem code to create an e820 entry per instance. Similar to
E820_TYPE_PRAM, bypass merging resource when the e820 map is sanitized.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/x86/kernel/e820.c | 16 +++++++++++++++-
drivers/firmware/efi/x86_fake_mem.c | 12 +++++++++---
2 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 983cd53ed4c9..22aad412f965 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -305,6 +305,20 @@ static int __init cpcompare(const void *a, const void *b)
return (ap->addr != ap->entry->addr) - (bp->addr != bp->entry->addr);
}
+static bool e820_nomerge(enum e820_type type)
+{
+ /*
+ * These types may indicate distinct platform ranges aligned to
+ * numa node, protection domain, performance domain, or other
+ * boundaries. Do not merge them.
+ */
+ if (type == E820_TYPE_PRAM)
+ return true;
+ if (type == E820_TYPE_SOFT_RESERVED)
+ return true;
+ return false;
+}
+
int __init e820__update_table(struct e820_table *table)
{
struct e820_entry *entries = table->entries;
@@ -380,7 +394,7 @@ int __init e820__update_table(struct e820_table *table)
}
/* Continue building up new map based on this information: */
- if (current_type != last_type || current_type == E820_TYPE_PRAM) {
+ if (current_type != last_type || e820_nomerge(current_type)) {
if (last_type != 0) {
new_entries[new_nr_entries].size = change_point[chg_idx]->addr - last_addr;
/* Move forward only if the new size was non-zero: */
diff --git a/drivers/firmware/efi/x86_fake_mem.c b/drivers/firmware/efi/x86_fake_mem.c
index e5d6d5a1b240..0bafcc1bb0f6 100644
--- a/drivers/firmware/efi/x86_fake_mem.c
+++ b/drivers/firmware/efi/x86_fake_mem.c
@@ -38,7 +38,7 @@ void __init efi_fake_memmap_early(void)
m_start = mem->range.start;
m_end = mem->range.end;
for_each_efi_memory_desc(md) {
- u64 start, end;
+ u64 start, end, size;
if (md->type != EFI_CONVENTIONAL_MEMORY)
continue;
@@ -58,11 +58,17 @@ void __init efi_fake_memmap_early(void)
*/
start = max(start, m_start);
end = min(end, m_end);
+ size = end - start + 1;
if (end <= start)
continue;
- e820__range_update(start, end - start + 1, E820_TYPE_RAM,
- E820_TYPE_SOFT_RESERVED);
+
+ /*
+ * Ensure each efi_fake_mem instance results in
+ * a unique e820 resource
+ */
+ e820__range_remove(start, size, E820_TYPE_RAM, 1);
+ e820__range_add(start, size, E820_TYPE_SOFT_RESERVED);
e820__update_table(e820_table);
}
}
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next prev parent reply other threads:[~2020-08-03 5:19 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-03 5:02 [PATCH v4 00/23] device-dax: Support sub-dividing soft-reserved ranges Dan Williams
2020-08-03 5:02 ` [PATCH v4 01/23] x86/numa: Cleanup configuration dependent command-line options Dan Williams
2020-08-03 5:02 ` [PATCH v4 02/23] x86/numa: Add 'nohmat' option Dan Williams
2020-08-03 5:02 ` Dan Williams [this message]
2020-08-03 5:02 ` [PATCH v4 04/23] ACPI: HMAT: Refactor hmat_register_target_device to hmem_register_device Dan Williams
2020-08-03 5:02 ` [PATCH v4 05/23] resource: Report parent to walk_iomem_res_desc() callback Dan Williams
2020-08-03 5:02 ` [PATCH v4 06/23] mm/memory_hotplug: Introduce default phys_to_target_node() implementation Dan Williams
2020-08-03 5:03 ` [PATCH v4 07/23] ACPI: HMAT: Attach a device for each soft-reserved range Dan Williams
2020-08-03 5:03 ` [PATCH v4 08/23] device-dax: Drop the dax_region.pfn_flags attribute Dan Williams
2020-08-03 5:03 ` [PATCH v4 09/23] device-dax: Move instance creation parameters to 'struct dev_dax_data' Dan Williams
2020-08-03 5:03 ` [PATCH v4 10/23] device-dax: Make pgmap optional for instance creation Dan Williams
2020-08-03 5:03 ` [PATCH v4 11/23] device-dax: Kill dax_kmem_res Dan Williams
2020-08-21 10:06 ` David Hildenbrand
2020-09-08 15:33 ` Joao Martins
2020-09-08 18:03 ` David Hildenbrand
2020-09-23 8:04 ` David Hildenbrand
2020-09-23 21:41 ` Dan Williams
2020-09-24 7:25 ` David Hildenbrand
2020-09-24 13:54 ` Dan Williams
2020-09-24 18:12 ` David Hildenbrand
2020-09-24 21:26 ` Dan Williams
2020-09-24 21:41 ` David Hildenbrand
2020-09-24 21:50 ` Dan Williams
2020-09-25 8:54 ` David Hildenbrand
2020-08-03 5:03 ` [PATCH v4 12/23] device-dax: Add an allocation interface for device-dax instances Dan Williams
2020-08-03 5:03 ` [PATCH v4 13/23] device-dax: Introduce 'seed' devices Dan Williams
2020-08-03 5:03 ` [PATCH v4 14/23] drivers/base: Make device_find_child_by_name() compatible with sysfs inputs Dan Williams
2020-08-03 5:03 ` [PATCH v4 15/23] device-dax: Add resize support Dan Williams
2020-08-21 22:56 ` Andrew Morton
2020-08-03 5:03 ` [PATCH v4 16/23] mm/memremap_pages: Convert to 'struct range' Dan Williams
2020-08-03 5:03 ` [PATCH v4 17/23] mm/memremap_pages: Support multiple ranges per invocation Dan Williams
2020-08-03 5:04 ` [PATCH v4 18/23] device-dax: Add dis-contiguous resource support Dan Williams
2020-08-03 5:04 ` [PATCH v4 19/23] device-dax: Introduce 'mapping' devices Dan Williams
2020-08-03 5:04 ` [PATCH v4 20/23] device-dax: Make align a per-device property Dan Williams
2020-08-03 5:04 ` [PATCH v4 21/23] device-dax: Add an 'align' attribute Dan Williams
2020-08-03 5:04 ` [PATCH v4 22/23] dax/hmem: Introduce dax_hmem.region_idle parameter Dan Williams
2020-08-03 5:04 ` [PATCH v4 23/23] device-dax: Add a range mapping allocation attribute Dan Williams
2020-08-03 7:47 ` [PATCH v4 00/23] device-dax: Support sub-dividing soft-reserved ranges David Hildenbrand
2020-08-20 1:53 ` Dan Williams
2020-08-21 10:15 ` David Hildenbrand
2020-08-21 18:27 ` Dan Williams
2020-08-21 18:30 ` David Hildenbrand
2020-08-21 21:17 ` Dan Williams
2020-08-21 21:33 ` David Hildenbrand
2020-08-21 21:42 ` David Hildenbrand
2020-08-21 21:43 ` David Hildenbrand
2020-08-21 21:46 ` David Hildenbrand
2020-08-21 23:21 ` Andrew Morton
2020-08-22 2:32 ` Leizhen (ThunderTown)
2020-09-08 10:45 ` David Hildenbrand
2020-09-23 0:43 ` Dan Williams
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