[Patch V5 05/16] xen: move static e820 map to global scope
From: Juergen Gross
Date: Fri Jul 10 2015 - 09:06:30 EST
Instead of using a function local static e820 map in xen_memory_setup()
and calling various functions in the same source with the map as a
parameter use a map directly accessible by all functions in the source.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
arch/x86/xen/setup.c | 96 +++++++++++++++++++++++++++-------------------------
1 file changed, 49 insertions(+), 47 deletions(-)
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index adad417..ab6c36e 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -38,6 +38,10 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
/* Number of pages released from the initial allocation. */
unsigned long xen_released_pages;
+/* E820 map used during setting up memory. */
+static struct e820entry xen_e820_map[E820MAX] __initdata;
+static u32 xen_e820_map_entries __initdata;
+
/*
* Buffer used to remap identity mapped pages. We only need the virtual space.
* The physical page behind this address is remapped as needed to different
@@ -164,15 +168,13 @@ void __init xen_inv_extra_mem(void)
* This function updates min_pfn with the pfn found and returns
* the size of that range or zero if not found.
*/
-static unsigned long __init xen_find_pfn_range(
- const struct e820entry *list, size_t map_size,
- unsigned long *min_pfn)
+static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
{
- const struct e820entry *entry;
+ const struct e820entry *entry = xen_e820_map;
unsigned int i;
unsigned long done = 0;
- for (i = 0, entry = list; i < map_size; i++, entry++) {
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
unsigned long s_pfn;
unsigned long e_pfn;
@@ -356,9 +358,9 @@ static void __init xen_do_set_identity_and_remap_chunk(
* to Xen and not remapped.
*/
static unsigned long __init xen_set_identity_and_remap_chunk(
- const struct e820entry *list, size_t map_size, unsigned long start_pfn,
- unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,
- unsigned long *released, unsigned long *remapped)
+ unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
+ unsigned long remap_pfn, unsigned long *released,
+ unsigned long *remapped)
{
unsigned long pfn;
unsigned long i = 0;
@@ -379,8 +381,7 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
if (cur_pfn + size > nr_pages)
size = nr_pages - cur_pfn;
- remap_range_size = xen_find_pfn_range(list, map_size,
- &remap_pfn);
+ remap_range_size = xen_find_pfn_range(&remap_pfn);
if (!remap_range_size) {
pr_warning("Unable to find available pfn range, not remapping identity pages\n");
xen_set_identity_and_release_chunk(cur_pfn,
@@ -411,13 +412,12 @@ static unsigned long __init xen_set_identity_and_remap_chunk(
return remap_pfn;
}
-static void __init xen_set_identity_and_remap(
- const struct e820entry *list, size_t map_size, unsigned long nr_pages,
- unsigned long *released, unsigned long *remapped)
+static void __init xen_set_identity_and_remap(unsigned long nr_pages,
+ unsigned long *released, unsigned long *remapped)
{
phys_addr_t start = 0;
unsigned long last_pfn = nr_pages;
- const struct e820entry *entry;
+ const struct e820entry *entry = xen_e820_map;
unsigned long num_released = 0;
unsigned long num_remapped = 0;
int i;
@@ -433,9 +433,9 @@ static void __init xen_set_identity_and_remap(
* example) the DMI tables in a reserved region that begins on
* a non-page boundary.
*/
- for (i = 0, entry = list; i < map_size; i++, entry++) {
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
phys_addr_t end = entry->addr + entry->size;
- if (entry->type == E820_RAM || i == map_size - 1) {
+ if (entry->type == E820_RAM || i == xen_e820_map_entries - 1) {
unsigned long start_pfn = PFN_DOWN(start);
unsigned long end_pfn = PFN_UP(end);
@@ -444,9 +444,9 @@ static void __init xen_set_identity_and_remap(
if (start_pfn < end_pfn)
last_pfn = xen_set_identity_and_remap_chunk(
- list, map_size, start_pfn,
- end_pfn, nr_pages, last_pfn,
- &num_released, &num_remapped);
+ start_pfn, end_pfn, nr_pages,
+ last_pfn, &num_released,
+ &num_remapped);
start = end;
}
}
@@ -549,12 +549,12 @@ static void __init xen_align_and_add_e820_region(phys_addr_t start,
e820_add_region(start, end - start, type);
}
-static void __init xen_ignore_unusable(struct e820entry *list, size_t map_size)
+static void __init xen_ignore_unusable(void)
{
- struct e820entry *entry;
+ struct e820entry *entry = xen_e820_map;
unsigned int i;
- for (i = 0, entry = list; i < map_size; i++, entry++) {
+ for (i = 0; i < xen_e820_map_entries; i++, entry++) {
if (entry->type == E820_UNUSABLE)
entry->type = E820_RAM;
}
@@ -600,8 +600,6 @@ static void __init xen_reserve_xen_mfnlist(void)
**/
char * __init xen_memory_setup(void)
{
- static struct e820entry map[E820MAX] __initdata;
-
unsigned long max_pfn = xen_start_info->nr_pages;
phys_addr_t mem_end;
int rc;
@@ -616,7 +614,7 @@ char * __init xen_memory_setup(void)
mem_end = PFN_PHYS(max_pfn);
memmap.nr_entries = E820MAX;
- set_xen_guest_handle(memmap.buffer, map);
+ set_xen_guest_handle(memmap.buffer, xen_e820_map);
op = xen_initial_domain() ?
XENMEM_machine_memory_map :
@@ -625,15 +623,16 @@ char * __init xen_memory_setup(void)
if (rc == -ENOSYS) {
BUG_ON(xen_initial_domain());
memmap.nr_entries = 1;
- map[0].addr = 0ULL;
- map[0].size = mem_end;
+ xen_e820_map[0].addr = 0ULL;
+ xen_e820_map[0].size = mem_end;
/* 8MB slack (to balance backend allocations). */
- map[0].size += 8ULL << 20;
- map[0].type = E820_RAM;
+ xen_e820_map[0].size += 8ULL << 20;
+ xen_e820_map[0].type = E820_RAM;
rc = 0;
}
BUG_ON(rc);
BUG_ON(memmap.nr_entries == 0);
+ xen_e820_map_entries = memmap.nr_entries;
/*
* Xen won't allow a 1:1 mapping to be created to UNUSABLE
@@ -644,10 +643,11 @@ char * __init xen_memory_setup(void)
* a patch in the future.
*/
if (xen_initial_domain())
- xen_ignore_unusable(map, memmap.nr_entries);
+ xen_ignore_unusable();
/* Make sure the Xen-supplied memory map is well-ordered. */
- sanitize_e820_map(map, memmap.nr_entries, &memmap.nr_entries);
+ sanitize_e820_map(xen_e820_map, xen_e820_map_entries,
+ &xen_e820_map_entries);
max_pages = xen_get_max_pages();
if (max_pages > max_pfn)
@@ -657,8 +657,8 @@ char * __init xen_memory_setup(void)
* Set identity map on non-RAM pages and prepare remapping the
* underlying RAM.
*/
- xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,
- &xen_released_pages, &remapped_pages);
+ xen_set_identity_and_remap(max_pfn, &xen_released_pages,
+ &remapped_pages);
extra_pages += xen_released_pages;
extra_pages += remapped_pages;
@@ -677,10 +677,10 @@ char * __init xen_memory_setup(void)
extra_pages = min(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
extra_pages);
i = 0;
- while (i < memmap.nr_entries) {
- phys_addr_t addr = map[i].addr;
- phys_addr_t size = map[i].size;
- u32 type = map[i].type;
+ while (i < xen_e820_map_entries) {
+ phys_addr_t addr = xen_e820_map[i].addr;
+ phys_addr_t size = xen_e820_map[i].size;
+ u32 type = xen_e820_map[i].type;
if (type == E820_RAM) {
if (addr < mem_end) {
@@ -696,9 +696,9 @@ char * __init xen_memory_setup(void)
xen_align_and_add_e820_region(addr, size, type);
- map[i].addr += size;
- map[i].size -= size;
- if (map[i].size == 0)
+ xen_e820_map[i].addr += size;
+ xen_e820_map[i].size -= size;
+ if (xen_e820_map[i].size == 0)
i++;
}
@@ -709,7 +709,7 @@ char * __init xen_memory_setup(void)
* PFNs above MAX_P2M_PFN are considered identity mapped as
* well.
*/
- set_phys_range_identity(map[i-1].addr / PAGE_SIZE, ~0ul);
+ set_phys_range_identity(xen_e820_map[i - 1].addr / PAGE_SIZE, ~0ul);
/*
* In domU, the ISA region is normal, usable memory, but we
@@ -731,23 +731,25 @@ char * __init xen_memory_setup(void)
*/
char * __init xen_auto_xlated_memory_setup(void)
{
- static struct e820entry map[E820MAX] __initdata;
-
struct xen_memory_map memmap;
int i;
int rc;
memmap.nr_entries = E820MAX;
- set_xen_guest_handle(memmap.buffer, map);
+ set_xen_guest_handle(memmap.buffer, xen_e820_map);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc < 0)
panic("No memory map (%d)\n", rc);
- sanitize_e820_map(map, ARRAY_SIZE(map), &memmap.nr_entries);
+ xen_e820_map_entries = memmap.nr_entries;
+
+ sanitize_e820_map(xen_e820_map, ARRAY_SIZE(xen_e820_map),
+ &xen_e820_map_entries);
- for (i = 0; i < memmap.nr_entries; i++)
- e820_add_region(map[i].addr, map[i].size, map[i].type);
+ for (i = 0; i < xen_e820_map_entries; i++)
+ e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size,
+ xen_e820_map[i].type);
xen_reserve_xen_mfnlist();
--
2.1.4
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