[PATCH 2/2] efi: Remove global 'memmap'

From: Matt Fleming
Date: Mon Apr 11 2016 - 09:03:50 EST

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Previous message: Matt Fleming: "[PATCH 1/2] efi: Iterate over efi->memmap in for_each_efi_memory_desc"
In reply to: kbuild test robot: "Re: [PATCH 1/2] efi: Iterate over efi->memmap in for_each_efi_memory_desc"
Next in thread: Ard Biesheuvel: "Re: [PATCH 2/2] efi: Remove global 'memmap'"
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Abolish the poorly named EFI memory map named 'memmap'. It is shadowed
by a bunch of local definitions in various files and having two ways
to access the EFI memory map ('efi->memmap' vs 'memmap') is rather
confusing.

Furthermore, ia64 doesn't even provide this global object, which has
caused issues when trying to write generic EFI memmap code.

Replace all occurrences with efi.memmap.

Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/platform/efi/efi.c | 86 +++++++++++++++++++++-----------------
drivers/firmware/efi/arm-init.c | 20 ++++-----
drivers/firmware/efi/arm-runtime.c | 13 +++---
drivers/firmware/efi/fake_mem.c | 40 +++++++++---------
include/linux/efi.h | 7 ++--
5 files changed, 86 insertions(+), 80 deletions(-)

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index bd8f03301b59..88d2fb2cb3ef 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -56,8 +56,6 @@

#define EFI_DEBUG

-struct efi_memory_map memmap;
-
static struct efi efi_phys __initdata;
static efi_system_table_t efi_systab __initdata;

@@ -207,15 +205,13 @@ int __init efi_memblock_x86_reserve_range(void)
#else
pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
#endif
- memmap.phys_map = pmap;
- memmap.nr_map = e->efi_memmap_size /
+ efi.memmap.phys_map = pmap;
+ efi.memmap.nr_map = e->efi_memmap_size /
e->efi_memdesc_size;
- memmap.desc_size = e->efi_memdesc_size;
- memmap.desc_version = e->efi_memdesc_version;
-
- memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
+ efi.memmap.desc_size = e->efi_memdesc_size;
+ efi.memmap.desc_version = e->efi_memdesc_version;

- efi.memmap = &memmap;
+ memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);

return 0;
}
@@ -240,10 +236,14 @@ void __init efi_print_memmap(void)

void __init efi_unmap_memmap(void)
{
+ unsigned long size;
+
clear_bit(EFI_MEMMAP, &efi.flags);
- if (memmap.map) {
- early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size);
- memmap.map = NULL;
+
+ size = efi.memmap.nr_map * efi.memmap.desc_size;
+ if (efi.memmap.map) {
+ early_memunmap(efi.memmap.map, size);
+ efi.memmap.map = NULL;
}
}

@@ -432,17 +432,22 @@ static int __init efi_runtime_init(void)

static int __init efi_memmap_init(void)
{
+ unsigned long addr, size;
+
if (efi_enabled(EFI_PARAVIRT))
return 0;

/* Map the EFI memory map */
- memmap.map = early_memremap((unsigned long)memmap.phys_map,
- memmap.nr_map * memmap.desc_size);
- if (memmap.map == NULL) {
+ size = efi.memmap.nr_map * efi.memmap.desc_size;
+ addr = (unsigned long)efi.memmap.phys_map;
+
+ efi.memmap.map = early_memremap(addr, size);
+ if (efi.memmap.map == NULL) {
pr_err("Could not map the memory map!\n");
return -ENOMEM;
}
- memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
+
+ efi.memmap.map_end = efi.memmap.map + size;

if (add_efi_memmap)
do_add_efi_memmap();
@@ -544,7 +549,6 @@ void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
void __init runtime_code_page_mkexec(void)
{
efi_memory_desc_t *md;
- void *p;

/* Make EFI runtime service code area executable */
for_each_efi_memory_desc(md) {
@@ -594,7 +598,6 @@ void __init old_map_region(efi_memory_desc_t *md)
/* Merge contiguous regions of the same type and attribute */
static void __init efi_merge_regions(void)
{
- void *p;
efi_memory_desc_t *md, *prev_md = NULL;

for_each_efi_memory_desc(md) {
@@ -640,6 +643,7 @@ static void __init get_systab_virt_addr(efi_memory_desc_t *md)
static void __init save_runtime_map(void)
{
#ifdef CONFIG_KEXEC_CORE
+ unsigned long desc_size;
efi_memory_desc_t *md;
void *tmp, *q = NULL;
int count = 0;
@@ -647,21 +651,23 @@ static void __init save_runtime_map(void)
if (efi_enabled(EFI_OLD_MEMMAP))
return;

+ desc_size = efi.memmap.desc_size;
+
for_each_efi_memory_desc(md) {
if (!(md->attribute & EFI_MEMORY_RUNTIME) ||
(md->type == EFI_BOOT_SERVICES_CODE) ||
(md->type == EFI_BOOT_SERVICES_DATA))
continue;
- tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL);
+ tmp = krealloc(q, (count + 1) * desc_size, GFP_KERNEL);
if (!tmp)
goto out;
q = tmp;

- memcpy(q + count * memmap.desc_size, md, memmap.desc_size);
+ memcpy(q + count * desc_size, md, desc_size);
count++;
}

- efi_runtime_map_setup(q, count, memmap.desc_size);
+ efi_runtime_map_setup(q, count, desc_size);
return;

out:
@@ -701,10 +707,10 @@ static inline void *efi_map_next_entry_reverse(void *entry)
{
/* Initial call */
if (!entry)
- return memmap.map_end - memmap.desc_size;
+ return efi.memmap.map_end - efi.memmap.desc_size;

- entry -= memmap.desc_size;
- if (entry < memmap.map)
+ entry -= efi.memmap.desc_size;
+ if (entry < efi.memmap.map)
return NULL;

return entry;
@@ -746,10 +752,10 @@ static void *efi_map_next_entry(void *entry)

/* Initial call */
if (!entry)
- return memmap.map;
+ return efi.memmap.map;

- entry += memmap.desc_size;
- if (entry >= memmap.map_end)
+ entry += efi.memmap.desc_size;
+ if (entry >= efi.memmap.map_end)
return NULL;

return entry;
@@ -763,8 +769,11 @@ static void * __init efi_map_regions(int *count, int *pg_shift)
{
void *p, *new_memmap = NULL;
unsigned long left = 0;
+ unsigned long desc_size;
efi_memory_desc_t *md;

+ desc_size = efi.memmap.desc_size;
+
p = NULL;
while ((p = efi_map_next_entry(p))) {
md = p;
@@ -779,7 +788,7 @@ static void * __init efi_map_regions(int *count, int *pg_shift)
efi_map_region(md);
get_systab_virt_addr(md);

- if (left < memmap.desc_size) {
+ if (left < desc_size) {
new_memmap = realloc_pages(new_memmap, *pg_shift);
if (!new_memmap)
return NULL;
@@ -788,10 +797,9 @@ static void * __init efi_map_regions(int *count, int *pg_shift)
(*pg_shift)++;
}

- memcpy(new_memmap + (*count * memmap.desc_size), md,
- memmap.desc_size);
+ memcpy(new_memmap + (*count * desc_size), md, desc_size);

- left -= memmap.desc_size;
+ left -= desc_size;
(*count)++;
}

@@ -835,10 +843,10 @@ static void __init kexec_enter_virtual_mode(void)

BUG_ON(!efi.systab);

- num_pages = ALIGN(memmap.nr_map * memmap.desc_size, PAGE_SIZE);
+ num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
num_pages >>= PAGE_SHIFT;

- if (efi_setup_page_tables(memmap.phys_map, num_pages)) {
+ if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return;
}
@@ -922,16 +930,16 @@ static void __init __efi_enter_virtual_mode(void)

if (efi_is_native()) {
status = phys_efi_set_virtual_address_map(
- memmap.desc_size * count,
- memmap.desc_size,
- memmap.desc_version,
+ efi.memmap.desc_size * count,
+ efi.memmap.desc_size,
+ efi.memmap.desc_version,
(efi_memory_desc_t *)__pa(new_memmap));
} else {
status = efi_thunk_set_virtual_address_map(
efi_phys.set_virtual_address_map,
- memmap.desc_size * count,
- memmap.desc_size,
- memmap.desc_version,
+ efi.memmap.desc_size * count,
+ efi.memmap.desc_size,
+ efi.memmap.desc_version,
(efi_memory_desc_t *)__pa(new_memmap));
}

diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index 96e7fe548164..275187a86a19 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -20,8 +20,6 @@

#include <asm/efi.h>

-struct efi_memory_map memmap;
-
u64 efi_system_table;

static int __init is_normal_ram(efi_memory_desc_t *md)
@@ -40,7 +38,7 @@ static phys_addr_t efi_to_phys(unsigned long addr)
{
efi_memory_desc_t *md;

- for_each_efi_memory_desc_in_map(&memmap, md) {
+ for_each_efi_memory_desc(md) {
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == 0)
@@ -145,7 +143,7 @@ static __init void reserve_regions(void)
if (efi_enabled(EFI_DBG))
pr_info("Processing EFI memory map:\n");

- for_each_efi_memory_desc_in_map(&memmap, md) {
+ for_each_efi_memory_desc(md) {
paddr = md->phys_addr;
npages = md->num_pages;

@@ -186,9 +184,9 @@ void __init efi_init(void)

efi_system_table = params.system_table;

- memmap.phys_map = params.mmap;
- memmap.map = early_memremap_ro(params.mmap, params.mmap_size);
- if (memmap.map == NULL) {
+ efi.memmap.phys_map = params.mmap;
+ efi.memmap.map = early_memremap_ro(params.mmap, params.mmap_size);
+ if (efi.memmap.map == NULL) {
/*
* If we are booting via UEFI, the UEFI memory map is the only
* description of memory we have, so there is little point in
@@ -196,15 +194,15 @@ void __init efi_init(void)
*/
panic("Unable to map EFI memory map.\n");
}
- memmap.map_end = memmap.map + params.mmap_size;
- memmap.desc_size = params.desc_size;
- memmap.desc_version = params.desc_ver;
+ efi.memmap.map_end = efi.memmap.map + params.mmap_size;
+ efi.memmap.desc_size = params.desc_size;
+ efi.memmap.desc_version = params.desc_ver;

if (uefi_init() < 0)
return;

reserve_regions();
- early_memunmap(memmap.map, params.mmap_size);
+ early_memunmap(efi.memmap.map, params.mmap_size);
memblock_mark_nomap(params.mmap & PAGE_MASK,
PAGE_ALIGN(params.mmap_size +
(params.mmap & ~PAGE_MASK)));
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 1cfbfaf57a2d..0416d5d33e74 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -89,6 +89,7 @@ static bool __init efi_virtmap_init(void)
*/
static int __init arm_enable_runtime_services(void)
{
+ phys_addr_t phys_map;
u64 mapsize;

if (!efi_enabled(EFI_BOOT)) {
@@ -103,15 +104,15 @@ static int __init arm_enable_runtime_services(void)

pr_info("Remapping and enabling EFI services.\n");

- mapsize = memmap.map_end - memmap.map;
- memmap.map = (__force void *)ioremap_cache(memmap.phys_map,
- mapsize);
- if (!memmap.map) {
+ mapsize = efi.memmap.map_end - efi.memmap.map;
+ phys_map = efi.memmap.phys_map;
+
+ efi.memmap.map = (__force void *)ioremap_cache(phys_map, mapsize);
+ if (!efi.memmap.map) {
pr_err("Failed to remap EFI memory map\n");
return -ENOMEM;
}
- memmap.map_end = memmap.map + mapsize;
- efi.memmap = &memmap;
+ efi.memmap.map_end = efi.memmap.map + mapsize;

if (!efi_virtmap_init()) {
pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c
index f55b75b2e1f4..48430aba13c1 100644
--- a/drivers/firmware/efi/fake_mem.c
+++ b/drivers/firmware/efi/fake_mem.c
@@ -57,7 +57,7 @@ static int __init cmp_fake_mem(const void *x1, const void *x2)
void __init efi_fake_memmap(void)
{
u64 start, end, m_start, m_end, m_attr;
- int new_nr_map = memmap.nr_map;
+ int new_nr_map = efi.memmap.nr_map;
efi_memory_desc_t *md;
phys_addr_t new_memmap_phy;
void *new_memmap;
@@ -94,25 +94,25 @@ void __init efi_fake_memmap(void)
}

/* allocate memory for new EFI memmap */
- new_memmap_phy = memblock_alloc(memmap.desc_size * new_nr_map,
+ new_memmap_phy = memblock_alloc(efi.memmap.desc_size * new_nr_map,
PAGE_SIZE);
if (!new_memmap_phy)
return;

/* create new EFI memmap */
new_memmap = early_memremap(new_memmap_phy,
- memmap.desc_size * new_nr_map);
+ efi.memmap.desc_size * new_nr_map);
if (!new_memmap) {
- memblock_free(new_memmap_phy, memmap.desc_size * new_nr_map);
+ memblock_free(new_memmap_phy, efi.memmap.desc_size * new_nr_map);
return;
}

- for (old = memmap.map, new = new_memmap;
- old < memmap.map_end;
- old += memmap.desc_size, new += memmap.desc_size) {
+ for (old = efi.memmap.map, new = new_memmap;
+ old < efi.memmap.map_end;
+ old += efi.memmap.desc_size, new += efi.memmap.desc_size) {

/* copy original EFI memory descriptor */
- memcpy(new, old, memmap.desc_size);
+ memcpy(new, old, efi.memmap.desc_size);
md = new;
start = md->phys_addr;
end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
@@ -133,8 +133,8 @@ void __init efi_fake_memmap(void)
md->num_pages = (m_end - md->phys_addr + 1) >>
EFI_PAGE_SHIFT;
/* latter part */
- new += memmap.desc_size;
- memcpy(new, old, memmap.desc_size);
+ new += efi.memmap.desc_size;
+ memcpy(new, old, efi.memmap.desc_size);
md = new;
md->phys_addr = m_end + 1;
md->num_pages = (end - md->phys_addr + 1) >>
@@ -146,16 +146,16 @@ void __init efi_fake_memmap(void)
md->num_pages = (m_start - md->phys_addr) >>
EFI_PAGE_SHIFT;
/* middle part */
- new += memmap.desc_size;
- memcpy(new, old, memmap.desc_size);
+ new += efi.memmap.desc_size;
+ memcpy(new, old, efi.memmap.desc_size);
md = new;
md->attribute |= m_attr;
md->phys_addr = m_start;
md->num_pages = (m_end - m_start + 1) >>
EFI_PAGE_SHIFT;
/* last part */
- new += memmap.desc_size;
- memcpy(new, old, memmap.desc_size);
+ new += efi.memmap.desc_size;
+ memcpy(new, old, efi.memmap.desc_size);
md = new;
md->phys_addr = m_end + 1;
md->num_pages = (end - m_end) >>
@@ -168,8 +168,8 @@ void __init efi_fake_memmap(void)
md->num_pages = (m_start - md->phys_addr) >>
EFI_PAGE_SHIFT;
/* latter part */
- new += memmap.desc_size;
- memcpy(new, old, memmap.desc_size);
+ new += efi.memmap.desc_size;
+ memcpy(new, old, efi.memmap.desc_size);
md = new;
md->phys_addr = m_start;
md->num_pages = (end - md->phys_addr + 1) >>
@@ -181,10 +181,10 @@ void __init efi_fake_memmap(void)

/* swap into new EFI memmap */
efi_unmap_memmap();
- memmap.map = new_memmap;
- memmap.phys_map = new_memmap_phy;
- memmap.nr_map = new_nr_map;
- memmap.map_end = memmap.map + memmap.nr_map * memmap.desc_size;
+ efi.memmap.map = new_memmap;
+ efi.memmap.phys_map = new_memmap_phy;
+ efi.memmap.nr_map = new_nr_map;
+ efi.memmap.map_end = efi.memmap.map + efi.memmap.nr_map * efi.memmap.desc_size;
set_bit(EFI_MEMMAP, &efi.flags);

/* print new EFI memmap */
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 942b13863790..c2c0da49876e 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -883,7 +883,7 @@ extern struct efi {
efi_get_next_high_mono_count_t *get_next_high_mono_count;
efi_reset_system_t *reset_system;
efi_set_virtual_address_map_t *set_virtual_address_map;
- struct efi_memory_map *memmap;
+ struct efi_memory_map memmap;
unsigned long flags;
} efi;

@@ -945,7 +945,6 @@ extern void efi_initialize_iomem_resources(struct resource *code_resource,
extern void efi_get_time(struct timespec *now);
extern void efi_reserve_boot_services(void);
extern int efi_get_fdt_params(struct efi_fdt_params *params);
-extern struct efi_memory_map memmap;
extern struct kobject *efi_kobj;

extern int efi_reboot_quirk_mode;
@@ -964,13 +963,13 @@ static inline void efi_fake_memmap(void) { }
(md) = (void *)(md) + (m)->desc_size)

/**
- * for_each_efi_memory_desc - iterate over descriptors in efi->memmap
+ * for_each_efi_memory_desc - iterate over descriptors in efi.memmap
* @md: the efi_memory_desc_t * iterator
*
* Once the loop finishes @md must not be accessed.
*/
#define for_each_efi_memory_desc(md) \
- for_each_efi_memory_desc_in_map(efi->memmap, md)
+ for_each_efi_memory_desc_in_map(&efi.memmap, md)

/*
* Format an EFI memory descriptor's type and attributes to a user-provided
--
2.7.3

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Next in thread: Ard Biesheuvel: "Re: [PATCH 2/2] efi: Remove global 'memmap'"
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