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authorJean-Philippe Brucker <jean-philippe.brucker@arm.com>2019-04-08 18:17:19 +0100
committerWill Deacon <will.deacon@arm.com>2019-04-09 12:39:13 +0100
commit827a108e354db633698f0b4a10c1ffd2b1f8d1d0 (patch)
tree2931dfa38b16416f454d9091cbd8c4ff0d9b081e /arch/arm64/mm
parent6fda41bf12615ee7c3ddac88155099b1a8cf8d00 (diff)
downloadlinux-827a108e354db633698f0b4a10c1ffd2b1f8d1d0.tar.bz2
arm64: Save and restore OSDLR_EL1 across suspend/resume
When the CPU comes out of suspend, the firmware may have modified the OS Double Lock Register. Save it in an unused slot of cpu_suspend_ctx, and restore it on resume. Cc: <stable@vger.kernel.org> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r--arch/arm64/mm/proc.S34
1 files changed, 18 insertions, 16 deletions
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index aa0817c9c4c3..fdd626d34274 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -65,24 +65,25 @@ ENTRY(cpu_do_suspend)
mrs x2, tpidr_el0
mrs x3, tpidrro_el0
mrs x4, contextidr_el1
- mrs x5, cpacr_el1
- mrs x6, tcr_el1
- mrs x7, vbar_el1
- mrs x8, mdscr_el1
- mrs x9, oslsr_el1
- mrs x10, sctlr_el1
+ mrs x5, osdlr_el1
+ mrs x6, cpacr_el1
+ mrs x7, tcr_el1
+ mrs x8, vbar_el1
+ mrs x9, mdscr_el1
+ mrs x10, oslsr_el1
+ mrs x11, sctlr_el1
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
- mrs x11, tpidr_el1
+ mrs x12, tpidr_el1
alternative_else
- mrs x11, tpidr_el2
+ mrs x12, tpidr_el2
alternative_endif
- mrs x12, sp_el0
+ mrs x13, sp_el0
stp x2, x3, [x0]
- stp x4, xzr, [x0, #16]
- stp x5, x6, [x0, #32]
- stp x7, x8, [x0, #48]
- stp x9, x10, [x0, #64]
- stp x11, x12, [x0, #80]
+ stp x4, x5, [x0, #16]
+ stp x6, x7, [x0, #32]
+ stp x8, x9, [x0, #48]
+ stp x10, x11, [x0, #64]
+ stp x12, x13, [x0, #80]
ret
ENDPROC(cpu_do_suspend)
@@ -105,8 +106,8 @@ ENTRY(cpu_do_resume)
msr cpacr_el1, x6
/* Don't change t0sz here, mask those bits when restoring */
- mrs x5, tcr_el1
- bfi x8, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
+ mrs x7, tcr_el1
+ bfi x8, x7, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
msr tcr_el1, x8
msr vbar_el1, x9
@@ -130,6 +131,7 @@ alternative_endif
/*
* Restore oslsr_el1 by writing oslar_el1
*/
+ msr osdlr_el1, x5
ubfx x11, x11, #1, #1
msr oslar_el1, x11
reset_pmuserenr_el0 x0 // Disable PMU access from EL0