Merge branch 'parisc-for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

Pull parisc updates from Helge Deller:
 "Main fixes and updates in this patch series are:
   - we faced kernel stack corruptions because of multiple delivery of
     interrupts
   - added kernel stack overflow checks
   - added possibility to use dedicated stacks for irq processing
   - initial support for page sizes > 4k
   - more information in /proc/interrupts (e.g.  TLB flushes and number
     of IPI calls)
   - documented how the parisc gateway page works
   - and of course quite some other smaller cleanups and fixes."

* 'parisc-for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: tlb flush counting fix for SMP and UP
  parisc: more irq statistics in /proc/interrupts
  parisc: implement irq stacks
  parisc: add kernel stack overflow check
  parisc: only re-enable interrupts if we need to schedule or deliver signals when returning to userspace
  parisc: implement atomic64_dec_if_positive()
  parisc: use long branch in fork_like macro
  parisc: fix NATIVE set up in build
  parisc: document the parisc gateway page
  parisc: fix partly 16/64k PAGE_SIZE boot
  parisc: Provide default implementation for dma_{alloc, free}_attrs
  parisc: fix whitespace errors in arch/parisc/kernel/traps.c
  parisc: remove the second argument of kmap_atomic

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index 42cfcd9eb9a..1ff1b67e8b2 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -575,7 +575,7 @@ sba_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
 
 	mtsp(sid,1);
 	asm("lci 0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
-	pa |= (ci >> 12) & 0xff;  /* move CI (8 bits) into lowest byte */
+	pa |= (ci >> PAGE_SHIFT) & 0xff;  /* move CI (8 bits) into lowest byte */
 
 	pa |= SBA_PDIR_VALID_BIT;	/* set "valid" bit */
 	*pdir_ptr = cpu_to_le64(pa);	/* swap and store into I/O Pdir */
@@ -1376,7 +1376,7 @@ static void
 sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
 {
 	u32 iova_space_size, iova_space_mask;
-	unsigned int pdir_size, iov_order;
+	unsigned int pdir_size, iov_order, tcnfg;
 
 	/*
 	** Determine IOVA Space size from memory size.
@@ -1468,8 +1468,19 @@ sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num)
 	WRITE_REG(ioc->ibase | 1, ioc->ioc_hpa+IOC_IBASE);
 	WRITE_REG(ioc->imask, ioc->ioc_hpa+IOC_IMASK);
 
-	/* Set I/O PDIR Page size to 4K */
-	WRITE_REG(0, ioc->ioc_hpa+IOC_TCNFG);
+	/* Set I/O PDIR Page size to system page size */
+	switch (PAGE_SHIFT) {
+		case 12: tcnfg = 0; break;	/*  4K */
+		case 13: tcnfg = 1; break;	/*  8K */
+		case 14: tcnfg = 2; break;	/* 16K */
+		case 16: tcnfg = 3; break;	/* 64K */
+		default:
+			panic(__FILE__ "Unsupported system page size %d",
+				1 << PAGE_SHIFT);
+			break;
+	}
+	/* Set I/O PDIR Page size to PAGE_SIZE (4k/16k/...) */
+	WRITE_REG(tcnfg, ioc->ioc_hpa+IOC_TCNFG);
 
 	/*
 	** Clear I/O TLB of any possible entries.