fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / drivers / infiniband / hw / ipath / ipath_user_pages.c

diff --git a/drivers/infiniband/hw/ipath/ipath_user_pages.c b/drivers/infiniband/hw/ipath/ipath_user_pages.c
index f4bf9c7..311ec3b 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_user_pages.c
+++ b/drivers/infiniband/hw/ipath/ipath_user_pages.c
@@ -91,6 +91,62 @@ bail:
        return ret;
 }
 
+/**
+ * ipath_map_page - a safety wrapper around pci_map_page()
+ *
+ * A dma_addr of all 0's is interpreted by the chip as "disabled".
+ * Unfortunately, it can also be a valid dma_addr returned on some
+ * architectures.
+ *
+ * The powerpc iommu assigns dma_addrs in ascending order, so we don't
+ * have to bother with retries or mapping a dummy page to insure we
+ * don't just get the same mapping again.
+ *
+ * I'm sure we won't be so lucky with other iommu's, so FIXME.
+ */
+dma_addr_t ipath_map_page(struct pci_dev *hwdev, struct page *page,
+       unsigned long offset, size_t size, int direction)
+{
+       dma_addr_t phys;
+
+       phys = pci_map_page(hwdev, page, offset, size, direction);
+
+       if (phys == 0) {
+               pci_unmap_page(hwdev, phys, size, direction);
+               phys = pci_map_page(hwdev, page, offset, size, direction);
+               /*
+                * FIXME: If we get 0 again, we should keep this page,
+                * map another, then free the 0 page.
+                */
+       }
+
+       return phys;
+}
+
+/**
+ * ipath_map_single - a safety wrapper around pci_map_single()
+ *
+ * Same idea as ipath_map_page().
+ */
+dma_addr_t ipath_map_single(struct pci_dev *hwdev, void *ptr, size_t size,
+       int direction)
+{
+       dma_addr_t phys;
+
+       phys = pci_map_single(hwdev, ptr, size, direction);
+
+       if (phys == 0) {
+               pci_unmap_single(hwdev, phys, size, direction);
+               phys = pci_map_single(hwdev, ptr, size, direction);
+               /*
+                * FIXME: If we get 0 again, we should keep this page,
+                * map another, then free the 0 page.
+                */
+       }
+
+       return phys;
+}
+
 /**
  * ipath_get_user_pages - lock user pages into memory
  * @start_page: the start page
@@ -160,9 +216,10 @@ struct ipath_user_pages_work {
        unsigned long num_pages;
 };
 
-static void user_pages_account(void *ptr)
+static void user_pages_account(struct work_struct *_work)
 {
-       struct ipath_user_pages_work *work = ptr;
+       struct ipath_user_pages_work *work =
+               container_of(_work, struct ipath_user_pages_work, work);
 
        down_write(&work->mm->mmap_sem);
        vx_vmlocked_sub(work->mm, work->num_pages);
@@ -188,7 +245,7 @@ void ipath_release_user_pages_on_close(struct page **p, size_t num_pages)
 
        goto bail;
 
-       INIT_WORK(&work->work, user_pages_account, work);
+       INIT_WORK(&work->work, user_pages_account);
        work->mm = mm;
        work->num_pages = num_pages;