linux_dsm_epyc7002/arch/s390/include/asm/mmu.h

#ifndef __MMU_H
#define __MMU_H

typedef struct {
	spinlock_t list_lock;
	struct list_head crst_list;
	struct list_head pgtable_list;
	unsigned long asce_bits;
	unsigned long asce_limit;
	unsigned long vdso_base;
	int noexec;
	int has_pgste;	 /* The mmu context has extended page tables */
	int alloc_pgste; /* cloned contexts will have extended page tables */
} mm_context_t;

#endif
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 05:20:36 +07:00			`#ifndef __MMU_H`
			`#define __MMU_H`

[S390] 1K/2K page table pages. This patch implements 1K/2K page table pages for s390. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-02-10 00:24:35 +07:00			`typedef struct {`
[S390] fix recursive locking on page_table_lock Suzuki Poulose reported the following recursive locking bug on s390: Here is the stack trace : (see Appendix I for more info) [<0000000000406ed6>] _spin_lock+0x52/0x94 [<0000000000103bde>] crst_table_free+0x14e/0x1a4 [<00000000001ba684>] __pmd_alloc+0x114/0x1ec [<00000000001be8d0>] handle_mm_fault+0x2cc/0xb80 [<0000000000407d62>] do_dat_exception+0x2b6/0x3a0 [<0000000000114f8c>] sysc_return+0x0/0x8 [<00000200001642b2>] 0x200001642b2 The page_table_lock is already acquired in __pmd_alloc (mm/memory.c) and it tries to populate the pud/pgd with a new pmd allocated. If another thread populates it before we get a chance, we free the pmd using pmd_free(). On s390x, pmd_free(even pud_free ) is #defined to crst_table_free(), which acquires the page_table_lock to protect the crst_table index updates. Hence this ends up in a recursive locking of the page_table_lock. The solution suggested by Dave Hansen is to use a new spin lock in the mmu context to protect the access to the crst_list and the pgtable_list. Reported-by: Suzuki Poulose <suzuki@in.ibm.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2009-09-11 15:28:57 +07:00			`spinlock_t list_lock;`
[S390] 1K/2K page table pages. This patch implements 1K/2K page table pages for s390. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-02-10 00:24:35 +07:00			`struct list_head crst_list;`
			`struct list_head pgtable_list;`
			`unsigned long asce_bits;`
[S390] dynamic page tables. Add support for different number of page table levels dependent on the highest address used for a process. This will cause a 31 bit process to use a two level page table instead of the four level page table that is the default after the pud has been introduced. Likewise a normal 64 bit process will use three levels instead of four. Only if a process runs out of the 4 tera bytes which can be addressed with a three level page table the fourth level is dynamically added. Then the process can use up to 8 peta byte. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-02-10 00:24:37 +07:00			`unsigned long asce_limit;`
[S390] introduce vdso on s390 Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for CLOCK_REALTIME/CLOCK_MONOTONIC. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-12-25 19:38:36 +07:00			`unsigned long vdso_base;`
[S390] 1K/2K page table pages. This patch implements 1K/2K page table pages for s390. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-02-10 00:24:35 +07:00			`int noexec;`
[S390] pgtables: Fix race in enable_sie vs. page table ops The current enable_sie code sets the mm->context.pgstes bit to tell dup_mm that the new mm should have extended page tables. This bit is also used by the s390 specific page table primitives to decide about the page table layout - which means context.pgstes has two meanings. This can cause any kind of bugs. For example - e.g. shrink_zone can call ptep_clear_flush_young while enable_sie is running. ptep_clear_flush_young will test for context.pgstes. Since enable_sie changed that value of the old struct mm without changing the page table layout ptep_clear_flush_young will do the wrong thing. The solution is to split pgstes into two bits - one for the allocation - one for the current state Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-10-28 17:10:15 +07:00			`int has_pgste; /* The mmu context has extended page tables */`
			`int alloc_pgste; /* cloned contexts will have extended page tables */`
[S390] 1K/2K page table pages. This patch implements 1K/2K page table pages for s390. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> 2008-02-10 00:24:35 +07:00			`} mm_context_t;`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 05:20:36 +07:00
			`#endif`