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lx_emul: support for 'alloc_pages_exact'

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Sebastian Sumpf 2022-05-11 15:47:36 +02:00 committed by Christian Helmuth
parent dc77417396
commit c74a8c9fa8
1 changed files with 30 additions and 10 deletions
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40
repos/dde_linux/src/lib/lx_emul/shadow/mm/page_alloc.c
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@ -12,6 +12,7 @@
*/ */
#include <linux/gfp.h> #include <linux/gfp.h>
#include <linux/mm.h>
#include <linux/version.h> #include <linux/version.h>
#include <lx_emul/alloc.h> #include <lx_emul/alloc.h>
#include <lx_emul/debug.h> #include <lx_emul/debug.h>
@ -41,11 +42,9 @@ unsigned long __alloc_pages_bulk(gfp_t gfp,int preferred_nid,
return nr_pages; return nr_pages;
} }
static void lx_free_pages(struct page *page, unsigned const num_pages)
void __free_pages(struct page * page, unsigned int order)
{ {
unsigned i; unsigned i;
unsigned const num_pages = (1 << order);
void * const virt_addr = page->virtual; void * const virt_addr = page->virtual;
if (atomic_read(&page->_refcount) && !atomic_dec_and_test(&page->_refcount)) if (atomic_read(&page->_refcount) && !atomic_dec_and_test(&page->_refcount))
@ -59,15 +58,20 @@ void __free_pages(struct page * page, unsigned int order)
} }
/* void __free_pages(struct page * page, unsigned int order)
* In earlier kernel versions, '__alloc_pages' was an inline function.
*/
#if LINUX_VERSION_CODE > KERNEL_VERSION(5,12,0)
struct page * __alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
nodemask_t * nodemask)
{ {
unsigned const nr_pages = (1u << order); lx_free_pages(page, (1u << order));
}
void free_pages_exact(void *virt_addr, size_t size)
{
lx_free_pages(virt_to_page(virt_addr), PAGE_ALIGN(size) / PAGE_SIZE);
}
static struct page * lx_alloc_pages(unsigned const nr_pages)
{
void const *ptr = lx_emul_mem_alloc_aligned(PAGE_SIZE*nr_pages, PAGE_SIZE); void const *ptr = lx_emul_mem_alloc_aligned(PAGE_SIZE*nr_pages, PAGE_SIZE);
struct page *page = lx_emul_virt_to_pages(ptr, nr_pages); struct page *page = lx_emul_virt_to_pages(ptr, nr_pages);
@ -75,4 +79,20 @@ struct page * __alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
return page; return page;
} }
/*
* In earlier kernel versions, '__alloc_pages' was an inline function.
*/
#if LINUX_VERSION_CODE > KERNEL_VERSION(5,12,0)
struct page * __alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
nodemask_t * nodemask)
{
return lx_alloc_pages(1u << order);
}
#endif #endif
void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
{
return lx_alloc_pages(PAGE_ALIGN(size) / PAGE_SIZE)->virtual;
}