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xen: use common page allocation function in p2m.c

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In arch/x86/xen/p2m.c three different allocation functions for
obtaining a memory page are used: extend_brk(), alloc_bootmem_align()
or __get_free_page().  Which of those functions is used depends on the
progress of the boot process of the system.

Introduce a common allocation routine selecting the to be called
allocation routine dynamically based on the boot progress. This allows
moving initialization steps without having to care about changing
allocation calls.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross 2014-11-28 11:53:52 +01:00 committed by David Vrabel
parent 820c4db2be
commit 7108c9ce8f
2 changed files with 37 additions and 22 deletions
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2
arch/x86/xen/mmu.c
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@ -1219,6 +1219,8 @@ static void __init xen_pagetable_init(void)
paging_init();
#ifdef CONFIG_X86_64
xen_pagetable_p2m_copy();
#else
xen_revector_p2m_tree();
#endif
/* Allocate and initialize top and mid mfn levels for p2m structure */
xen_build_mfn_list_list();

57
arch/x86/xen/p2m.c
View File

@ -164,6 +164,7 @@
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/bootmem.h>
#include <linux/slab.h>
#include <asm/cache.h>
#include <asm/setup.h>
@ -204,6 +205,8 @@ RESERVE_BRK(p2m_mid, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER
*/
RESERVE_BRK(p2m_identity_remap, PAGE_SIZE * 2 * 3 * MAX_REMAP_RANGES);
static int use_brk = 1;
static inline unsigned p2m_top_index(unsigned long pfn)
{
BUG_ON(pfn >= MAX_P2M_PFN);
@ -268,6 +271,24 @@ static void p2m_init(unsigned long *p2m)
p2m[i] = INVALID_P2M_ENTRY;
}
static void * __ref alloc_p2m_page(void)
{
if (unlikely(use_brk))
return extend_brk(PAGE_SIZE, PAGE_SIZE);
if (unlikely(!slab_is_available()))
return alloc_bootmem_align(PAGE_SIZE, PAGE_SIZE);
return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
}
/* Only to be called in case of a race for a page just allocated! */
static void free_p2m_page(void *p)
{
BUG_ON(!slab_is_available());
free_page((unsigned long)p);
}
/*
* Build the parallel p2m_top_mfn and p2m_mid_mfn structures
*
@ -287,13 +308,13 @@ void __ref xen_build_mfn_list_list(void)
/* Pre-initialize p2m_top_mfn to be completely missing */
if (p2m_top_mfn == NULL) {
p2m_mid_missing_mfn = alloc_bootmem_align(PAGE_SIZE, PAGE_SIZE);
p2m_mid_missing_mfn = alloc_p2m_page();
p2m_mid_mfn_init(p2m_mid_missing_mfn, p2m_missing);
p2m_top_mfn_p = alloc_bootmem_align(PAGE_SIZE, PAGE_SIZE);
p2m_top_mfn_p = alloc_p2m_page();
p2m_top_mfn_p_init(p2m_top_mfn_p);
p2m_top_mfn = alloc_bootmem_align(PAGE_SIZE, PAGE_SIZE);
p2m_top_mfn = alloc_p2m_page();
p2m_top_mfn_init(p2m_top_mfn);
} else {
/* Reinitialise, mfn's all change after migration */
@ -327,7 +348,7 @@ void __ref xen_build_mfn_list_list(void)
* missing parts of the mfn tree after
* runtime.
*/
mid_mfn_p = alloc_bootmem_align(PAGE_SIZE, PAGE_SIZE);
mid_mfn_p = alloc_p2m_page();
p2m_mid_mfn_init(mid_mfn_p, p2m_missing);
p2m_top_mfn_p[topidx] = mid_mfn_p;
@ -364,17 +385,17 @@ void __init xen_build_dynamic_phys_to_machine(void)
max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages);
xen_max_p2m_pfn = max_pfn;
p2m_missing = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_missing = alloc_p2m_page();
p2m_init(p2m_missing);
p2m_identity = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_identity = alloc_p2m_page();
p2m_init(p2m_identity);
p2m_mid_missing = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_mid_missing = alloc_p2m_page();
p2m_mid_init(p2m_mid_missing, p2m_missing);
p2m_mid_identity = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_mid_identity = alloc_p2m_page();
p2m_mid_init(p2m_mid_identity, p2m_identity);
p2m_top = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m_top = alloc_p2m_page();
p2m_top_init(p2m_top);
/*
@ -387,7 +408,7 @@ void __init xen_build_dynamic_phys_to_machine(void)
unsigned mididx = p2m_mid_index(pfn);
if (p2m_top[topidx] == p2m_mid_missing) {
unsigned long **mid = extend_brk(PAGE_SIZE, PAGE_SIZE);
unsigned long **mid = alloc_p2m_page();
p2m_mid_init(mid, p2m_missing);
p2m_top[topidx] = mid;
@ -420,6 +441,7 @@ unsigned long __init xen_revector_p2m_tree(void)
unsigned long *mfn_list = NULL;
unsigned long size;
use_brk = 0;
va_start = xen_start_info->mfn_list;
/*We copy in increments of P2M_PER_PAGE * sizeof(unsigned long),
* so make sure it is rounded up to that */
@ -484,6 +506,7 @@ unsigned long __init xen_revector_p2m_tree(void)
#else
unsigned long __init xen_revector_p2m_tree(void)
{
use_brk = 0;
return 0;
}
#endif
@ -510,16 +533,6 @@ unsigned long get_phys_to_machine(unsigned long pfn)
}
EXPORT_SYMBOL_GPL(get_phys_to_machine);
static void *alloc_p2m_page(void)
{
return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
}
static void free_p2m_page(void *p)
{
free_page((unsigned long)p);
}
/*
* Fully allocate the p2m structure for a given pfn. We need to check
* that both the top and mid levels are allocated, and make sure the
@ -624,7 +637,7 @@ static bool __init early_alloc_p2m(unsigned long pfn, bool check_boundary)
return false;
/* Boundary cross-over for the edges: */
p2m = extend_brk(PAGE_SIZE, PAGE_SIZE);
p2m = alloc_p2m_page();
p2m_init(p2m);
@ -640,7 +653,7 @@ static bool __init early_alloc_p2m_middle(unsigned long pfn)
mid = p2m_top[topidx];
if (mid == p2m_mid_missing) {
mid = extend_brk(PAGE_SIZE, PAGE_SIZE);
mid = alloc_p2m_page();
p2m_mid_init(mid, p2m_missing);