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#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/pfn.h>
#include <linux/kmemleak.h>
#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/llist.h>
#include <linux/bitops.h>
#include <linux/rbtree_augmented.h>
#include <linux/overflow.h>
#include <linux/hugetlb.h>
#include <linux/uaccess.h>
#include <asm/tlbflush.h>
#include <asm/shmparam.h>
#include "pgalloc-track.h"
#include "riscv_vmap.h"
#define SYSPORT_MEM_PFN_OFFSET (0x400000000 >> PAGE_SHIFT)
#define __mk_pte(page, prot) pfn_pte(page_to_pfn(page) + SYSPORT_MEM_PFN_OFFSET, prot)
#define __mk_pte_cached(page, prot) pfn_pte(page_to_pfn(page), prot)
static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, pgprot_t prot, struct page **pages, int *nr,
pgtbl_mod_mask *mask, int cached)
{
pte_t *pte;
/*
* nr is a running index into the array which helps higher level
* callers keep track of where we're up to.
*/
pte = pte_alloc_kernel_track(pmd, addr, mask);
if (!pte)
return -ENOMEM;
do {
struct page *page = pages[*nr];
if (WARN_ON(!pte_none(*pte)))
return -EBUSY;
if (WARN_ON(!page))
return -ENOMEM;
/* Special processing for starfive RISC-V, pfn add an offset of 0x400000*/
if (cached)
set_pte_at(&init_mm, addr, pte, __mk_pte_cached(page, prot));
else
set_pte_at(&init_mm, addr, pte, __mk_pte(page, prot));
(*nr)++;
} while (pte++, addr += PAGE_SIZE, addr != end);
*mask |= PGTBL_PTE_MODIFIED;
return 0;
}
static int vmap_pmd_range(pud_t *pud, unsigned long addr,
unsigned long end, pgprot_t prot, struct page **pages, int *nr,
pgtbl_mod_mask *mask, int cached)
{
pmd_t *pmd;
unsigned long next;
pmd = pmd_alloc_track(&init_mm, pud, addr, mask);
if (!pmd)
return -ENOMEM;
do {
next = pmd_addr_end(addr, end);
if (vmap_pte_range(pmd, addr, next, prot, pages, nr, mask,
cached))
return -ENOMEM;
} while (pmd++, addr = next, addr != end);
return 0;
}
static int vmap_pud_range(p4d_t *p4d, unsigned long addr,
unsigned long end, pgprot_t prot, struct page **pages, int *nr,
pgtbl_mod_mask *mask, int cached)
{
pud_t *pud;
unsigned long next;
pud = pud_alloc_track(&init_mm, p4d, addr, mask);
if (!pud)
return -ENOMEM;
do {
next = pud_addr_end(addr, end);
if (vmap_pmd_range(pud, addr, next, prot, pages, nr, mask,
cached))
return -ENOMEM;
} while (pud++, addr = next, addr != end);
return 0;
}
static int vmap_p4d_range(pgd_t *pgd, unsigned long addr,
unsigned long end, pgprot_t prot, struct page **pages, int *nr,
pgtbl_mod_mask *mask, int cached)
{
p4d_t *p4d;
unsigned long next;
p4d = p4d_alloc_track(&init_mm, pgd, addr, mask);
if (!p4d)
return -ENOMEM;
do {
next = p4d_addr_end(addr, end);
if (vmap_pud_range(p4d, addr, next, prot, pages, nr, mask,
cached))
return -ENOMEM;
} while (p4d++, addr = next, addr != end);
return 0;
}
static int __map_kernel_range_noflush(unsigned long addr, unsigned long size,
pgprot_t prot, struct page **pages, int cached)
{
unsigned long start = addr;
unsigned long end = addr + size;
unsigned long next;
pgd_t *pgd;
int err = 0;
int nr = 0;
pgtbl_mod_mask mask = 0;
BUG_ON(addr >= end);
pgd = pgd_offset_k(addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_bad(*pgd))
mask |= PGTBL_PGD_MODIFIED;
err = vmap_p4d_range(pgd, addr, next, prot, pages, &nr, &mask,
cached);
if (err)
return err;
} while (pgd++, addr = next, addr != end);
if (mask & ARCH_PAGE_TABLE_SYNC_MASK)
arch_sync_kernel_mappings(start, end);
return 0;
}
static int __map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
struct page **pages, int cached)
{
int ret;
ret = __map_kernel_range_noflush(start, size, prot, pages, cached);
flush_cache_vmap(start, start + size);
return ret;
}
void *riscv_vmap(struct page **pages, unsigned int count,
unsigned long flags, pgprot_t prot, int cached)
{
struct vm_struct *area;
unsigned long size; /* In bytes */
might_sleep();
if (count > totalram_pages())
return NULL;
size = (unsigned long)count << PAGE_SHIFT;
area = get_vm_area_caller(size, flags, __builtin_return_address(0));
if (!area)
return NULL;
if (__map_kernel_range((unsigned long)area->addr, size, pgprot_nx(prot),
pages, cached) < 0) {
vunmap(area->addr);
return NULL;
}
if (flags & VM_MAP_PUT_PAGES)
area->pages = pages;
return area->addr;
}
EXPORT_SYMBOL_GPL(riscv_vmap);
/*---------------Test code-----*/
#ifdef IMG_GPU_DEBUG
extern unsigned long va2pa(unsigned long *vaddr_in);
void test_riscv_vmap(void)
{
struct page *pages[2];
void *tmp;
pgprot_t prot = PAGE_KERNEL;
prot = pgprot_noncached(prot);
printk("Page prot = %lx", pgprot_val(prot));
pages[0] = alloc_page(GFP_KERNEL);
pages[1] = alloc_page(GFP_KERNEL);
printk("Page struct: %lx %lx\n", (unsigned long)pages[0], (unsigned long)pages[1]);
printk("virt_addr_valid: %d %d\n", virt_addr_valid(pages[0]), virt_addr_valid(pages[1]));
printk("PPN: %lx %lx\n", page_to_pfn(pages[0]), page_to_pfn(pages[1]));
printk("Page address: %lx %lx\n", (unsigned long)page_address(pages[0]), (unsigned long)page_address(pages[1]));
tmp = riscv_vmap(pages, 2, VM_READ | VM_WRITE, prot);
va2pa(tmp);
memset(tmp, 0x78, 8 * 1024);
vunmap(tmp);
__free_pages(pages[0], 0);
__free_pages(pages[1], 0);
printk("Pages freed!\n");
//free_page((unsigned long)pages[0]);
//free_page((unsigned long)pages[1]);
}
#endif
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