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parisc: Also flush data TLB in flush_icache_page_asm 

This is the second issue I noticed in reviewing the parisc TLB code.

The fic instruction may use either the instruction or data TLB in
flushing the instruction cache.  Thus, on machines with a split TLB, we
should also flush the data TLB after setting up the temporary alias
registers.

Although this has no functional impact, I changed the pdtlb and pitlb
instructions to consistently use the index register %r0.  These
instructions do not support integer displacements.

Tested on rp3440 and c8000.

Signed-off-by: John David Anglin  <dave.anglin@bell.net>
Cc: <stable@vger.kernel.org> # v3.16+
Signed-off-by: Helge Deller <deller@gmx.de>
hifive-unleashed-5.1
John David Anglin 2016-11-24 20:18:14 -05:00 committed by Helge Deller
parent c0452fb9fb
commit 5035b230e7
1 changed files with 22 additions and 15 deletions
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37
arch/parisc/kernel/pacache.S
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@ -96,7 +96,7 @@ fitmanyloop: /* Loop if LOOP >= 2 */
fitmanymiddle: /* Loop if LOOP >= 2 */
addib,COND(>) -1, %r31, fitmanymiddle /* Adjusted inner loop decr */
pitlbe 0(%sr1, %r28)
pitlbe %r0(%sr1, %r28)
pitlbe,m %arg1(%sr1, %r28) /* Last pitlbe and addr adjust */
addib,COND(>) -1, %r29, fitmanymiddle /* Middle loop decr */
copy %arg3, %r31 /* Re-init inner loop count */
@ -139,7 +139,7 @@ fdtmanyloop: /* Loop if LOOP >= 2 */
fdtmanymiddle: /* Loop if LOOP >= 2 */
addib,COND(>) -1, %r31, fdtmanymiddle /* Adjusted inner loop decr */
pdtlbe 0(%sr1, %r28)
pdtlbe %r0(%sr1, %r28)
pdtlbe,m %arg1(%sr1, %r28) /* Last pdtlbe and addr adjust */
addib,COND(>) -1, %r29, fdtmanymiddle /* Middle loop decr */
copy %arg3, %r31 /* Re-init inner loop count */
@ -626,12 +626,12 @@ ENTRY_CFI(copy_user_page_asm)
/* Purge any old translations */
#ifdef CONFIG_PA20
pdtlb,l 0(%r28)
pdtlb,l 0(%r29)
pdtlb,l %r0(%r28)
pdtlb,l %r0(%r29)
#else
tlb_lock %r20,%r21,%r22
pdtlb 0(%r28)
pdtlb 0(%r29)
pdtlb %r0(%r28)
pdtlb %r0(%r29)
tlb_unlock %r20,%r21,%r22
#endif
@ -774,10 +774,10 @@ ENTRY_CFI(clear_user_page_asm)
/* Purge any old translation */
#ifdef CONFIG_PA20
pdtlb,l 0(%r28)
pdtlb,l %r0(%r28)
#else
tlb_lock %r20,%r21,%r22
pdtlb 0(%r28)
pdtlb %r0(%r28)
tlb_unlock %r20,%r21,%r22
#endif
@ -858,10 +858,10 @@ ENTRY_CFI(flush_dcache_page_asm)
/* Purge any old translation */
#ifdef CONFIG_PA20
pdtlb,l 0(%r28)
pdtlb,l %r0(%r28)
#else
tlb_lock %r20,%r21,%r22
pdtlb 0(%r28)
pdtlb %r0(%r28)
tlb_unlock %r20,%r21,%r22
#endif
@ -898,10 +898,10 @@ ENTRY_CFI(flush_dcache_page_asm)
sync
#ifdef CONFIG_PA20
pdtlb,l 0(%r25)
pdtlb,l %r0(%r25)
#else
tlb_lock %r20,%r21,%r22
pdtlb 0(%r25)
pdtlb %r0(%r25)
tlb_unlock %r20,%r21,%r22
#endif
@ -931,13 +931,18 @@ ENTRY_CFI(flush_icache_page_asm)
depwi 0, 31,PAGE_SHIFT, %r28 /* Clear any offset bits */
#endif
/* Purge any old translation */
/* Purge any old translation. Note that the FIC instruction
* may use either the instruction or data TLB. Given that we
* have a flat address space, it's not clear which TLB will be
* used. So, we purge both entries. */
#ifdef CONFIG_PA20
pdtlb,l %r0(%r28)
pitlb,l %r0(%sr4,%r28)
#else
tlb_lock %r20,%r21,%r22
pitlb (%sr4,%r28)
pdtlb %r0(%r28)
pitlb %r0(%sr4,%r28)
tlb_unlock %r20,%r21,%r22
#endif
@ -976,10 +981,12 @@ ENTRY_CFI(flush_icache_page_asm)
sync
#ifdef CONFIG_PA20
pdtlb,l %r0(%r28)
pitlb,l %r0(%sr4,%r25)
#else
tlb_lock %r20,%r21,%r22
pitlb (%sr4,%r25)
pdtlb %r0(%r28)
pitlb %r0(%sr4,%r25)
tlb_unlock %r20,%r21,%r22
#endif