iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm64: Save and restore OSDLR_EL1 across suspend/resume

Browse Source 
commit 827a108e354db633698f0b4a10c1ffd2b1f8d1d0 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jean-Philippe Brucker 2019-04-08 18:17:19 +01:00 committed by Greg Kroah-Hartman
parent ef27496f41
commit 235aeafb93
1 changed files with 14 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/arm64/mm/proc.S
View File

@ -64,17 +64,18 @@ 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
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 x4, x5, [x0, #16]
stp x6, x7, [x0, #32]
stp x8, x9, [x0, #48]
stp x10, x11, [x0, #64]
ret
ENDPROC(cpu_do_suspend)
@ -96,8 +97,8 @@ 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
@ -115,6 +116,7 @@ ENTRY(cpu_do_resume)
/*
* 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