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| author | Ram Pai <linuxram@us.ibm.com> | 2018-01-18 17:50:25 -0800 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 22:58:35 +1100 |
| commit | 4fb158f65ac5556b9b4a6f63f38272853ed99b22 (patch) | |
| tree | 4ec2bfa69af9f93d48cedc54c2de08671c4a4c7d /arch/powerpc/include/asm/book3s/64/mmu.h | |
| parent | 92e3da3cf193fd27996909956c12a23c0333da44 (diff) | |
| download | linux-0-day-4fb158f65ac5556b9b4a6f63f38272853ed99b22.tar.gz linux-0-day-4fb158f65ac5556b9b4a6f63f38272853ed99b22.tar.xz | |
powerpc: track allocation status of all pkeys
Total 32 keys are available on power7 and above. However
pkey 0,1 are reserved. So effectively we have 30 pkeys.
On 4K kernels, we do not have 5 bits in the PTE to
represent all the keys; we only have 3bits. Two of those
keys are reserved; pkey 0 and pkey 1. So effectively we
have 6 pkeys.
This patch keeps track of reserved keys, allocated keys
and keys that are currently free.
Also it adds skeletal functions and macros, that the
architecture-independent code expects to be available.
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/mmu.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/mmu.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h index c9448e19847a3..37ef23cc1136d 100644 --- a/arch/powerpc/include/asm/book3s/64/mmu.h +++ b/arch/powerpc/include/asm/book3s/64/mmu.h @@ -108,6 +108,15 @@ typedef struct { #ifdef CONFIG_SPAPR_TCE_IOMMU struct list_head iommu_group_mem_list; #endif + +#ifdef CONFIG_PPC_MEM_KEYS + /* + * Each bit represents one protection key. + * bit set -> key allocated + * bit unset -> key available for allocation + */ + u32 pkey_allocation_map; +#endif } mm_context_t; /* |