parisc: Use implicit space register selection for loading the coherence index of...

We only support I/O to kernel space. Using %sr1 to load the coherence
index may be racy unless interrupts are disabled. This patch changes the
code used to load the coherence index to use implicit space register
selection. This saves one instruction and eliminates the race.

Tested on rp3440, c8000 and c3750.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index 8937ba7..9b43464 100644 (file)
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -565,8 +565,6 @@ ccio_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
        /* We currently only support kernel addresses */
        BUG_ON(sid != KERNEL_SPACE);
 
-       mtsp(sid,1);
-
        /*
        ** WORD 1 - low order word
        ** "hints" parm includes the VALID bit!
@@ -597,7 +595,7 @@ ccio_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
        ** Grab virtual index [0:11]
        ** Deposit virt_idx bits into I/O PDIR word
        */
-       asm volatile ("lci %%r0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
+       asm volatile ("lci %%r0(%1), %0" : "=r" (ci) : "r" (vba));
        asm volatile ("extru %1,19,12,%0" : "+r" (ci) : "r" (ci));
        asm volatile ("depw  %1,15,12,%0" : "+r" (pa) : "r" (ci));
 

diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index afaf8e6..78df926 100644 (file)
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -575,8 +575,7 @@ sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
        pa = virt_to_phys(vba);
        pa &= IOVP_MASK;
 
-       mtsp(sid,1);
-       asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
+       asm("lci 0(%1), %0" : "=r" (ci) : "r" (vba));
        pa |= (ci >> PAGE_SHIFT) & 0xff;  /* move CI (8 bits) into lowest byte */
 
        pa |= SBA_PDIR_VALID_BIT;       /* set "valid" bit */