Mailing List Archive

ChangeSet 1.1390, 2005/04/28 14:52:41+01:00, smh22@firebug.cl.cam.ac.uk

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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