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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [IA64] paraviatualize /dev/mem to enable X.
# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID e5e6893ec6997513fc2920a2efc3bfd6ed6cd6b0
# Parent bef3a5ffd78d234cfa62641429c4e60ee754ae9d
[IA64] paraviatualize /dev/mem to enable X.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/arch/ia64/Kconfig | 3
linux-2.6-xen-sparse/arch/ia64/xen/Makefile | 2
linux-2.6-xen-sparse/arch/ia64/xen/mem.c | 76 ++++++++++++++++++++++++
linux-2.6-xen-sparse/include/asm-ia64/io.h | 7 ++
linux-2.6-xen-sparse/include/asm-ia64/uaccess.h | 20 ++++++
5 files changed, 104 insertions(+), 4 deletions(-)
diff -r bef3a5ffd78d -r e5e6893ec699 linux-2.6-xen-sparse/arch/ia64/Kconfig
--- a/linux-2.6-xen-sparse/arch/ia64/Kconfig Mon Dec 04 08:37:20 2006 -0700
+++ b/linux-2.6-xen-sparse/arch/ia64/Kconfig Mon Dec 04 08:44:57 2006 -0700
@@ -533,9 +533,6 @@ config XEN_SKBUFF
config XEN_SKBUFF
default y
-config XEN_DEVMEM
- default n
-
config XEN_REBOOT
default y
diff -r bef3a5ffd78d -r e5e6893ec699 linux-2.6-xen-sparse/arch/ia64/xen/Makefile
--- a/linux-2.6-xen-sparse/arch/ia64/xen/Makefile Mon Dec 04 08:37:20
2006 -0700
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/Makefile Mon Dec 04 08:44:57
2006 -0700
@@ -4,6 +4,6 @@
obj-y := hypercall.o xenivt.o xenentry.o xensetup.o xenpal.o xenhpski.o \
hypervisor.o pci-dma-xen.o util.o xencomm.o xcom_hcall.o \
- xcom_mini.o xcom_privcmd.o
+ xcom_mini.o xcom_privcmd.o mem.o
pci-dma-xen-y := ../../i386/kernel/pci-dma-xen.o
diff -r bef3a5ffd78d -r e5e6893ec699 linux-2.6-xen-sparse/include/asm-ia64/io.h
--- a/linux-2.6-xen-sparse/include/asm-ia64/io.h Mon Dec 04 08:37:20
2006 -0700
+++ b/linux-2.6-xen-sparse/include/asm-ia64/io.h Mon Dec 04 08:44:57
2006 -0700
@@ -129,6 +129,11 @@ extern int valid_mmap_phys_addr_range (u
(((bvec_to_bus((vec1)) + (vec1)->bv_len) == bvec_to_bus((vec2))) && \
((bvec_to_pseudophys((vec1)) + (vec1)->bv_len) == \
bvec_to_pseudophys((vec2))))
+
+/* We will be supplying our own /dev/mem implementation */
+#define ARCH_HAS_DEV_MEM
+#define ARCH_HAS_DEV_MEM_MMAP_MEM
+int xen_mmap_mem(struct file * file, struct vm_area_struct * vma);
#endif /* CONFIG_XEN */
# endif /* KERNEL */
@@ -458,6 +463,8 @@ ioremap (unsigned long offset, unsigned
ioremap (unsigned long offset, unsigned long size)
{
offset = HYPERVISOR_ioremap(offset, size);
+ if (IS_ERR_VALUE(offset))
+ return (void __iomem*)offset;
return (void __iomem *) (__IA64_UNCACHED_OFFSET | (offset));
}
diff -r bef3a5ffd78d -r e5e6893ec699
linux-2.6-xen-sparse/include/asm-ia64/uaccess.h
--- a/linux-2.6-xen-sparse/include/asm-ia64/uaccess.h Mon Dec 04 08:37:20
2006 -0700
+++ b/linux-2.6-xen-sparse/include/asm-ia64/uaccess.h Mon Dec 04 08:44:57
2006 -0700
@@ -365,6 +365,7 @@ ia64_done_with_exception (struct pt_regs
}
#define ARCH_HAS_TRANSLATE_MEM_PTR 1
+#ifndef CONFIG_XEN
static __inline__ char *
xlate_dev_mem_ptr (unsigned long p)
{
@@ -379,6 +380,25 @@ xlate_dev_mem_ptr (unsigned long p)
return ptr;
}
+#else
+static __inline__ char *
+xlate_dev_mem_ptr (unsigned long p, ssize_t sz)
+{
+ unsigned long pfn = p >> PAGE_SHIFT;
+
+ if (pfn_valid(pfn) && !PageUncached(pfn_to_page(pfn)))
+ return __va(p);
+
+ return ioremap(p, sz);
+}
+
+static __inline__ void
+xlate_dev_mem_ptr_unmap (char* v)
+{
+ if (REGION_NUMBER(v) == RGN_UNCACHED)
+ iounmap(v);
+}
+#endif
/*
* Convert a virtual cached kernel memory pointer to an uncached pointer
diff -r bef3a5ffd78d -r e5e6893ec699 linux-2.6-xen-sparse/arch/ia64/xen/mem.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/mem.c Mon Dec 04 08:44:57 2006 -0700
@@ -0,0 +1,76 @@
+/*
+ * Originally from linux/drivers/char/mem.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * Added devfs support.
+ * Jan-11-1998, C. Scott Ananian <cananian@xxxxxxxxxxxxxxxxxxxx>
+ * Shared /dev/zero mmaping support, Feb 2000, Kanoj Sarcar <kanoj@xxxxxxx>
+ */
+/*
+ * taken from
+ * linux/drivers/char/mem.c and linux-2.6-xen-sparse/drivers/xen/char/mem.c.
+ * adjusted for IA64 and made transparent.
+ * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
+ * VA Linux Systems Japan K.K.
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/efi.h>
+
+/*
+ * Architectures vary in how they handle caching for addresses
+ * outside of main memory.
+ *
+ */
+static inline int uncached_access(struct file *file, unsigned long addr)
+{
+ /*
+ * On ia64, we ignore O_SYNC because we cannot tolerate memory
attribute aliases.
+ */
+ return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
+}
+
+int xen_mmap_mem(struct file * file, struct vm_area_struct * vma)
+{
+ unsigned long addr = vma->vm_pgoff << PAGE_SHIFT;
+ size_t size = vma->vm_end - vma->vm_start;
+
+
+#if 0
+ /*
+ *XXX FIXME: linux-2.6.16.29, linux-2.6.17
+ * valid_mmap_phys_addr_range() in linux/arch/ia64/kernel/efi.c
+ * fails checks.
+ * linux-2.6.18.1's returns always 1.
+ * Its comments says
+ *
+ * MMIO regions are often missing from the EFI memory map.
+ * We must allow mmap of them for programs like X, so we
+ * currently can't do any useful validation.
+ */
+ if (!valid_mmap_phys_addr_range(addr, &size))
+ return -EINVAL;
+ if (size < vma->vm_end - vma->vm_start)
+ return -EINVAL;
+#endif
+
+ if (is_running_on_xen()) {
+ unsigned long offset = HYPERVISOR_ioremap(addr, size);
+ if (IS_ERR_VALUE(offset))
+ return offset;
+ }
+
+ if (uncached_access(file, vma->vm_pgoff << PAGE_SHIFT))
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ /* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
+ if (remap_pfn_range(vma,
+ vma->vm_start,
+ vma->vm_pgoff,
+ size,
+ vma->vm_page_prot))
+ return -EAGAIN;
+ return 0;
+}
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