[Xen-changelog] fix 2.4 build

[BitKeeper Bot <riel@xxxxxxxxxxx>]

ChangeSet 1.1390, 2005/04/28 14:52:41+01:00, smh22@xxxxxxxxxxxxxxxxxxxx

        fix 2.4 build



 pci-dma.c |  137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 137 insertions(+)


diff -Nru a/linux-2.4.29-xen-sparse/arch/xen/kernel/pci-dma.c 
b/linux-2.4.29-xen-sparse/arch/xen/kernel/pci-dma.c
--- /dev/null   Wed Dec 31 16:00:00 196900
+++ b/linux-2.4.29-xen-sparse/arch/xen/kernel/pci-dma.c 2005-04-28 11:03:15 
-04:00
@@ -0,0 +1,137 @@
+/*
+ * Dynamic DMA mapping support.
+ *
+ * On i386 there is no hardware dynamic DMA address translation,
+ * so consistent alloc/free are merely page allocation/freeing.
+ * The rest of the dynamic DMA mapping interface is implemented
+ * in asm/pci.h.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/version.h>
+#include <asm/io.h>
+#include <asm-xen/balloon.h>
+
+#define pte_offset_kernel pte_offset
+
+struct dma_coherent_mem {
+       void            *virt_base;
+       u32             device_base;
+       int             size;
+       int             flags;
+       unsigned long   *bitmap;
+};
+
+static void
+xen_contig_memory(unsigned long vstart, unsigned int order)
+{
+       /*
+        * Ensure multi-page extents are contiguous in machine memory.
+        * This code could be cleaned up some, and the number of
+        * hypercalls reduced.
+        */
+       pgd_t         *pgd; 
+       pmd_t         *pmd;
+       pte_t         *pte;
+       unsigned long  pfn, i, flags;
+
+       scrub_pages(vstart, 1 << order);
+
+        balloon_lock(flags);
+
+       /* 1. Zap current PTEs, giving away the underlying pages. */
+       for (i = 0; i < (1<<order); i++) {
+               pgd = pgd_offset_k(   (vstart + (i*PAGE_SIZE)));
+               pmd = pmd_offset(pgd, (vstart + (i*PAGE_SIZE)));
+               pte = pte_offset_kernel(pmd, (vstart + (i*PAGE_SIZE)));
+               pfn = pte->pte_low >> PAGE_SHIFT;
+               HYPERVISOR_update_va_mapping(
+                       vstart + (i*PAGE_SIZE), __pte_ma(0), 0);
+               phys_to_machine_mapping[(__pa(vstart)>>PAGE_SHIFT)+i] =
+                       INVALID_P2M_ENTRY;
+               if (HYPERVISOR_dom_mem_op(MEMOP_decrease_reservation, 
+                                         &pfn, 1, 0) != 1) BUG();
+       }
+       /* 2. Get a new contiguous memory extent. */
+       if (HYPERVISOR_dom_mem_op(MEMOP_increase_reservation,
+                                 &pfn, 1, order) != 1) BUG();
+       /* 3. Map the new extent in place of old pages. */
+       for (i = 0; i < (1<<order); i++) {
+               pgd = pgd_offset_k(   (vstart + (i*PAGE_SIZE)));
+               pmd = pmd_offset(pgd, (vstart + (i*PAGE_SIZE)));
+               pte = pte_offset_kernel(pmd, (vstart + (i*PAGE_SIZE)));
+               HYPERVISOR_update_va_mapping(
+                       vstart + (i*PAGE_SIZE),
+                       __pte_ma(((pfn+i)<<PAGE_SHIFT)|__PAGE_KERNEL), 0);
+               xen_machphys_update(
+                       pfn+i, (__pa(vstart)>>PAGE_SHIFT)+i);
+               phys_to_machine_mapping[(__pa(vstart)>>PAGE_SHIFT)+i] =
+                       pfn+i;
+       }
+       /* Flush updates through and flush the TLB. */
+       flush_tlb_all();
+
+        balloon_unlock(flags);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
+                          dma_addr_t *dma_handle)
+#else
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                          dma_addr_t *dma_handle, int gfp)
+#endif
+{
+       void *ret;
+       unsigned int order = get_order(size);
+       unsigned long vstart;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+       int gfp = GFP_ATOMIC;
+
+       if (hwdev == NULL || ((u32)hwdev->dma_mask < 0xffffffff))
+               gfp |= GFP_DMA;
+#else
+       struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
+
+       /* ignore region specifiers */
+       gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+       if (mem) {
+               int page = bitmap_find_free_region(mem->bitmap, mem->size,
+                                                    order);
+               if (page >= 0) {
+                       *dma_handle = mem->device_base + (page << PAGE_SHIFT);
+                       ret = mem->virt_base + (page << PAGE_SHIFT);
+                       memset(ret, 0, size);
+                       return ret;
+               }
+               if (mem->flags & DMA_MEMORY_EXCLUSIVE)
+                       return NULL;
+       }
+
+       if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
+               gfp |= GFP_DMA;
+#endif
+
+       vstart = __get_free_pages(gfp, order);
+       ret = (void *)vstart;
+       if (ret == NULL)
+               return ret;
+
+       xen_contig_memory(vstart, order);
+
+       memset(ret, 0, size);
+       *dma_handle = virt_to_bus(ret);
+
+       return ret;
+}
+
+void pci_free_consistent(struct pci_dev *hwdev, size_t size,
+                        void *vaddr, dma_addr_t dma_handle)
+{
+       free_pages((unsigned long)vaddr, get_order(size));
+}

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