[PATCH v3 01/70] IB/qib: Use cache inhibitted and guarded mapping on powerpc
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2016-04-29 13:26:43
Subsystem:
infiniband subsystem, the rest · Maintainers:
Jason Gunthorpe, Leon Romanovsky, Linus Torvalds
From: "Aneesh Kumar K.V" <redacted> The driver was requesting for a writethrough mapping. But with those flags we will end up with an SAO mapping because we now have memory conherence always enabled. ie, the existing mapping will end up with a WIMG value 0b1110 which is Strong Access Order. Update this to use cache inhibitted guarded mapping. Cc: Doug Ledford <redacted> Cc: Sean Hefty <redacted> Cc: Hal Rosenstock <redacted> Cc: linux-rdma@vger.kernel.org Signed-off-by: Aneesh Kumar K.V <redacted> Acked-by: Mike Marciniszyn <redacted> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- drivers/infiniband/hw/qib/qib_file_ops.c | 5 +---- drivers/infiniband/hw/qib/qib_pcie.c | 6 ------ 2 files changed, 1 insertion(+), 10 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index e449e394963f..a3d593f546ec 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c@@ -822,10 +822,7 @@ static int mmap_piobufs(struct vm_area_struct *vma, phys = dd->physaddr + piobufs; #if defined(__powerpc__) - /* There isn't a generic way to specify writethrough mappings */ - pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; - pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU; - pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); #endif /*
diff --git a/drivers/infiniband/hw/qib/qib_pcie.c b/drivers/infiniband/hw/qib/qib_pcie.c
index 4758a3801ae8..6abe1c621aa4 100644
--- a/drivers/infiniband/hw/qib/qib_pcie.c
+++ b/drivers/infiniband/hw/qib/qib_pcie.c@@ -144,13 +144,7 @@ int qib_pcie_ddinit(struct qib_devdata *dd, struct pci_dev *pdev, addr = pci_resource_start(pdev, 0); len = pci_resource_len(pdev, 0); -#if defined(__powerpc__) - /* There isn't a generic way to specify writethrough mappings */ - dd->kregbase = __ioremap(addr, len, _PAGE_NO_CACHE | _PAGE_WRITETHRU); -#else dd->kregbase = ioremap_nocache(addr, len); -#endif - if (!dd->kregbase) return -ENOMEM;
--
2.5.0