arch/s390/include/asm/page-states.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *    Copyright IBM Corp. 2017
   4  *    Author(s): Claudio Imbrenda <[email protected]>
   5  */
   6
   7 #ifndef PAGE_STATES_H
   8 #define PAGE_STATES_H
   9
  10 #include <asm/page.h>
  11
  12 #define ESSA_GET_STATE                  0
  13 #define ESSA_SET_STABLE                 1
  14 #define ESSA_SET_UNUSED                 2
  15 #define ESSA_SET_VOLATILE               3
  16 #define ESSA_SET_POT_VOLATILE           4
  17 #define ESSA_SET_STABLE_RESIDENT        5
  18 #define ESSA_SET_STABLE_IF_RESIDENT     6
  19 #define ESSA_SET_STABLE_NODAT           7
  20
  21 #define ESSA_MAX        ESSA_SET_STABLE_NODAT
  22
  23 extern int cmma_flag;
  24
  25 static __always_inline unsigned long essa(unsigned long paddr, unsigned char cmd)
  26 {
  27         unsigned long rc;
  28
  29         asm volatile(
  30                 "       .insn   rrf,0xb9ab0000,%[rc],%[paddr],%[cmd],0"
  31                 : [rc] "=d" (rc)
  32                 : [paddr] "d" (paddr),
  33                   [cmd] "i" (cmd));
  34         return rc;
  35 }
  36
  37 static __always_inline void __set_page_state(void *addr, unsigned long num_pages, unsigned char cmd)
  38 {
  39         unsigned long paddr = __pa(addr) & PAGE_MASK;
  40
  41         while (num_pages--) {
  42                 essa(paddr, cmd);
  43                 paddr += PAGE_SIZE;
  44         }
  45 }
  46
  47 static inline void __set_page_unused(void *addr, unsigned long num_pages)
  48 {
  49         __set_page_state(addr, num_pages, ESSA_SET_UNUSED);
  50 }
  51
  52 static inline void __set_page_stable_dat(void *addr, unsigned long num_pages)
  53 {
  54         __set_page_state(addr, num_pages, ESSA_SET_STABLE);
  55 }
  56
  57 static inline void __set_page_stable_nodat(void *addr, unsigned long num_pages)
  58 {
  59         __set_page_state(addr, num_pages, ESSA_SET_STABLE_NODAT);
  60 }
  61
  62 static inline void __arch_set_page_nodat(void *addr, unsigned long num_pages)
  63 {
  64         if (!cmma_flag)
  65                 return;
  66         if (cmma_flag < 2)
  67                 __set_page_stable_dat(addr, num_pages);
  68         else
  69                 __set_page_stable_nodat(addr, num_pages);
  70 }
  71
  72 static inline void __arch_set_page_dat(void *addr, unsigned long num_pages)
  73 {
  74         if (!cmma_flag)
  75                 return;
  76         __set_page_stable_dat(addr, num_pages);
  77 }
  78
  79 #endif