[Xen-changelog] Map grant table pages in vmalloc kernel address space instead of fixmap.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID c5286130a96e684545f5ce3a75255eb6b97d3f8e
# Parent  cc303cdf88099ecdae5b1be53b3ef1cadee2df28
Map grant table pages in vmalloc kernel address space instead of fixmap.

Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r cc303cdf8809 -r c5286130a96e 
linux-2.6-xen-sparse/drivers/xen/core/gnttab.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/gnttab.c    Fri Mar 10 10:05:59 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/core/gnttab.c    Fri Mar 10 13:27:24 2006
@@ -31,6 +31,8 @@
 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
 #include <asm/pgtable.h>
 #include <xen/interface/xen.h>
 #include <asm/fixmap.h>
@@ -77,7 +79,7 @@
 static grant_ref_t gnttab_free_head;
 static spinlock_t gnttab_list_lock = SPIN_LOCK_UNLOCKED;
 
-static grant_entry_t *shared;
+static grant_entry_t *shared = NULL;
 
 static struct gnttab_free_callback *gnttab_free_callback_list = NULL;
 
@@ -354,12 +356,35 @@
        spin_unlock_irqrestore(&gnttab_list_lock, flags);
 }
 
+#ifndef __ia64__
+static int map_pte_fn(pte_t *pte, struct page *pte_page,
+                     unsigned long addr, void *data)
+{
+       unsigned long **frames = (unsigned long **)data;
+
+       set_pte_at(&init_mm, addr, pte, pfn_pte_ma((*frames)[0], PAGE_KERNEL));
+       (*frames)++;
+       return 0;
+}
+
+static int unmap_pte_fn(pte_t *pte, struct page *pte_page,
+                     unsigned long addr, void *data)
+{
+
+       set_pte_at(&init_mm, addr, pte, __pte(0));
+       return 0;
+}
+#endif
+
 int
 gnttab_resume(void)
 {
        gnttab_setup_table_t setup;
-       unsigned long        frames[NR_GRANT_FRAMES];
-       int                  i;
+       unsigned long frames[NR_GRANT_FRAMES];
+#ifndef __ia64__
+       void *pframes = frames;
+       struct vm_struct *area;
+#endif
 
        setup.dom        = DOMID_SELF;
        setup.nr_frames  = NR_GRANT_FRAMES;
@@ -368,12 +393,18 @@
        BUG_ON(HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1));
        BUG_ON(setup.status != 0);
 
-#ifdef __ia64__
+#ifndef __ia64__
+       if (shared == NULL) {
+               area = get_vm_area(PAGE_SIZE * NR_GRANT_FRAMES, VM_IOREMAP);
+               BUG_ON(area == NULL);
+               shared = area->addr;
+       }
+       BUG_ON(generic_page_range(&init_mm, (unsigned long)shared,
+                                 PAGE_SIZE * NR_GRANT_FRAMES,
+                                 map_pte_fn, &pframes));
+#else
        shared = __va(frames[0] << PAGE_SHIFT);
        printk("grant table at %p\n", shared);
-#else
-       for (i = 0; i < NR_GRANT_FRAMES; i++)
-               set_fixmap(FIX_GNTTAB_END - i, frames[i] << PAGE_SHIFT);
 #endif
 
        return 0;
@@ -382,10 +413,12 @@
 int
 gnttab_suspend(void)
 {
-       int i;
-
-       for (i = 0; i < NR_GRANT_FRAMES; i++)
-               clear_fixmap(FIX_GNTTAB_END - i);
+
+#ifndef __ia64__
+       generic_page_range(&init_mm, (unsigned long)shared,
+                          PAGE_SIZE * NR_GRANT_FRAMES,
+                          unmap_pte_fn, NULL);
+#endif
 
        return 0;
 }
@@ -399,10 +432,6 @@
                return -ENODEV;
 
        BUG_ON(gnttab_resume());
-
-#ifndef __ia64__
-       shared = (grant_entry_t *)fix_to_virt(FIX_GNTTAB_END);
-#endif
 
        for (i = NR_RESERVED_ENTRIES; i < NR_GRANT_ENTRIES; i++)
                gnttab_list[i] = i + 1;
diff -r cc303cdf8809 -r c5286130a96e 
linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h
--- a/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h       Fri Mar 
10 10:05:59 2006
+++ b/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/fixmap.h       Fri Mar 
10 13:27:24 2006
@@ -84,8 +84,6 @@
        FIX_PCIE_MCFG,
 #endif
        FIX_SHARED_INFO,
-       FIX_GNTTAB_BEGIN,
-       FIX_GNTTAB_END = FIX_GNTTAB_BEGIN + NR_GRANT_FRAMES - 1,
 #define NR_FIX_ISAMAPS 256
        FIX_ISAMAP_END,
        FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,
diff -r cc303cdf8809 -r c5286130a96e 
linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/fixmap.h
--- a/linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/fixmap.h     Fri Mar 
10 10:05:59 2006
+++ b/linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/fixmap.h     Fri Mar 
10 13:27:24 2006
@@ -52,8 +52,6 @@
        FIX_ACPI_END = FIX_ACPI_BEGIN + FIX_ACPI_PAGES - 1,
 #endif
        FIX_SHARED_INFO,
-       FIX_GNTTAB_BEGIN,
-       FIX_GNTTAB_END = FIX_GNTTAB_BEGIN + NR_GRANT_FRAMES - 1,
 #define NR_FIX_ISAMAPS 256
        FIX_ISAMAP_END,
        FIX_ISAMAP_BEGIN = FIX_ISAMAP_END + NR_FIX_ISAMAPS - 1,

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