Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 260 insertions, 0 deletions

diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
new file mode 100644
index 00000000000..758819d1999
--- /dev/null
+++ b/drivers/ieee1394/dma.c
@@ -0,0 +1,260 @@
+/*
+ * DMA region bookkeeping routines
+ *
+ * Copyright (C) 2002 Maas Digital LLC
+ *
+ * This code is licensed under the GPL.  See the file COPYING in the root
+ * directory of the kernel sources for details.
+ */
+
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include "dma.h"
+
+/* dma_prog_region */
+
+void dma_prog_region_init(struct dma_prog_region *prog)
+{
+        prog->kvirt = NULL;
+        prog->dev = NULL;
+        prog->n_pages = 0;
+        prog->bus_addr = 0;
+}
+
+int  dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, struct pci_dev *dev)
+{
+        /* round up to page size */
+        n_bytes = PAGE_ALIGN(n_bytes);
+
+        prog->n_pages = n_bytes >> PAGE_SHIFT;
+
+        prog->kvirt = pci_alloc_consistent(dev, n_bytes, &prog->bus_addr);
+        if (!prog->kvirt) {
+                printk(KERN_ERR "dma_prog_region_alloc: pci_alloc_consistent() failed\n");
+                dma_prog_region_free(prog);
+                return -ENOMEM;
+        }
+
+        prog->dev = dev;
+
+        return 0;
+}
+
+void dma_prog_region_free(struct dma_prog_region *prog)
+{
+        if (prog->kvirt) {
+                pci_free_consistent(prog->dev, prog->n_pages << PAGE_SHIFT, prog->kvirt, prog->bus_addr);
+        }
+
+        prog->kvirt = NULL;
+        prog->dev = NULL;
+        prog->n_pages = 0;
+        prog->bus_addr = 0;
+}
+
+/* dma_region */
+
+void dma_region_init(struct dma_region *dma)
+{
+        dma->kvirt = NULL;
+        dma->dev = NULL;
+        dma->n_pages = 0;
+        dma->n_dma_pages = 0;
+        dma->sglist = NULL;
+}
+
+int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_dev *dev, int direction)
+{
+        unsigned int i;
+
+        /* round up to page size */
+        n_bytes = PAGE_ALIGN(n_bytes);
+
+        dma->n_pages = n_bytes >> PAGE_SHIFT;
+
+        dma->kvirt = vmalloc_32(n_bytes);
+        if (!dma->kvirt) {
+                printk(KERN_ERR "dma_region_alloc: vmalloc_32() failed\n");
+                goto err;
+        }
+
+        /* Clear the ram out, no junk to the user */
+        memset(dma->kvirt, 0, n_bytes);
+
+        /* allocate scatter/gather list */
+        dma->sglist = vmalloc(dma->n_pages * sizeof(*dma->sglist));
+        if (!dma->sglist) {
+                printk(KERN_ERR "dma_region_alloc: vmalloc(sglist) failed\n");
+                goto err;
+        }
+
+        /* just to be safe - this will become unnecessary once sglist->address goes away */
+        memset(dma->sglist, 0, dma->n_pages * sizeof(*dma->sglist));
+
+        /* fill scatter/gather list with pages */
+        for (i = 0; i < dma->n_pages; i++) {
+                unsigned long va = (unsigned long) dma->kvirt + (i << PAGE_SHIFT);
+
+                dma->sglist[i].page = vmalloc_to_page((void *)va);
+                dma->sglist[i].length = PAGE_SIZE;
+        }
+
+        /* map sglist to the IOMMU */
+        dma->n_dma_pages = pci_map_sg(dev, dma->sglist, dma->n_pages, direction);
+
+        if (dma->n_dma_pages == 0) {
+                printk(KERN_ERR "dma_region_alloc: pci_map_sg() failed\n");
+                goto err;
+        }
+
+        dma->dev = dev;
+        dma->direction = direction;
+
+        return 0;
+
+err:
+        dma_region_free(dma);
+        return -ENOMEM;
+}
+
+void dma_region_free(struct dma_region *dma)
+{
+        if (dma->n_dma_pages) {
+                pci_unmap_sg(dma->dev, dma->sglist, dma->n_pages, dma->direction);
+                dma->n_dma_pages = 0;
+                dma->dev = NULL;
+        }
+
+        vfree(dma->sglist);
+        dma->sglist = NULL;
+
+        vfree(dma->kvirt);
+        dma->kvirt = NULL;
+        dma->n_pages = 0;
+}
+
+/* find the scatterlist index and remaining offset corresponding to a
+   given offset from the beginning of the buffer */
+static inline int dma_region_find(struct dma_region *dma, unsigned long offset, unsigned long *rem)
+{
+        int i;
+        unsigned long off = offset;
+
+        for (i = 0; i < dma->n_dma_pages; i++) {
+                if (off < sg_dma_len(&dma->sglist[i])) {
+                        *rem = off;
+                        break;
+                }
+
+                off -= sg_dma_len(&dma->sglist[i]);
+        }
+
+        BUG_ON(i >= dma->n_dma_pages);
+
+        return i;
+}
+
+dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, unsigned long offset)
+{
+        unsigned long rem;
+
+        struct scatterlist *sg = &dma->sglist[dma_region_find(dma, offset, &rem)];
+        return sg_dma_address(sg) + rem;
+}
+
+void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len)
+{
+        int first, last;
+        unsigned long rem;
+
+        if (!len)
+                len = 1;
+
+        first = dma_region_find(dma, offset, &rem);
+        last = dma_region_find(dma, offset + len - 1, &rem);
+
+        pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1, dma->direction);
+}
+
+void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len)
+{
+        int first, last;
+        unsigned long rem;
+
+        if (!len)
+                len = 1;
+
+        first = dma_region_find(dma, offset, &rem);
+        last = dma_region_find(dma, offset + len - 1, &rem);
+
+        pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first], last - first + 1, dma->direction);
+}
+
+#ifdef CONFIG_MMU
+
+/* nopage() handler for mmap access */
+
+static struct page*
+dma_region_pagefault(struct vm_area_struct *area, unsigned long address, int *type)
+{
+        unsigned long offset;
+        unsigned long kernel_virt_addr;
+        struct page *ret = NOPAGE_SIGBUS;
+
+        struct dma_region *dma = (struct dma_region*) area->vm_private_data;
+
+        if (!dma->kvirt)
+                goto out;
+
+        if ( (address < (unsigned long) area->vm_start) ||
+            (address > (unsigned long) area->vm_start + (dma->n_pages << PAGE_SHIFT)) )
+                goto out;
+
+        if (type)
+                *type = VM_FAULT_MINOR;
+        offset = address - area->vm_start;
+        kernel_virt_addr = (unsigned long) dma->kvirt + offset;
+        ret = vmalloc_to_page((void*) kernel_virt_addr);
+        get_page(ret);
+out:
+        return ret;
+}
+
+static struct vm_operations_struct dma_region_vm_ops = {
+        .nopage = dma_region_pagefault,
+};
+
+int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma)
+{
+        unsigned long size;
+
+        if (!dma->kvirt)
+                return -EINVAL;
+
+        /* must be page-aligned */
+        if (vma->vm_pgoff != 0)
+                return -EINVAL;
+
+        /* check the length */
+        size = vma->vm_end - vma->vm_start;
+        if (size > (dma->n_pages << PAGE_SHIFT))
+                return -EINVAL;
+
+        vma->vm_ops = &dma_region_vm_ops;
+        vma->vm_private_data = dma;
+        vma->vm_file = file;
+        vma->vm_flags |= VM_RESERVED;
+
+        return 0;
+}
+
+#else /* CONFIG_MMU */
+
+int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma)
+{
+        return -EINVAL;
+}
+
+#endif /* CONFIG_MMU */