[Xen-changelog] [xen master] xen/arm: io: Use binary search for mmio handler lookup

[patchbot@xxxxxxx]

commit 8047e090f42a39bda911f6b2e81fdab12603b64a
Author:     Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
AuthorDate: Wed Jul 20 09:00:55 2016 -0500
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Tue Jul 26 15:12:27 2016 -0700

    xen/arm: io: Use binary search for mmio handler lookup
    
    As the number of I/O handlers increase, the overhead associated with
    linear lookup also increases. The system might have maximum of 144
    (assuming CONFIG_NR_CPUS=128) mmio handlers. In worst case scenario,
    it would require 144 iterations for finding a matching handler. Now
    it is time for us to change from linear (complexity O(n)) to a binary
    search (complexity O(log n) for reducing mmio handler lookup overhead.
    
    Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/io.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/xen/arch/arm/io.c b/xen/arch/arm/io.c
index 40330f0..e8aa7fa 100644
--- a/xen/arch/arm/io.c
+++ b/xen/arch/arm/io.c
@@ -20,6 +20,7 @@
 #include <xen/lib.h>
 #include <xen/spinlock.h>
 #include <xen/sched.h>
+#include <xen/sort.h>
 #include <asm/current.h>
 #include <asm/mmio.h>
 
@@ -70,27 +71,31 @@ static int handle_write(const struct mmio_handler *handler, 
struct vcpu *v,
                                handler->priv);
 }
 
-static const struct mmio_handler *find_mmio_handler(struct domain *d,
-                                                    paddr_t gpa)
+/* This function assumes that mmio regions are not overlapped */
+static int cmp_mmio_handler(const void *key, const void *elem)
 {
-    const struct mmio_handler *handler;
-    unsigned int i;
-    struct vmmio *vmmio = &d->arch.vmmio;
+    const struct mmio_handler *handler0 = key;
+    const struct mmio_handler *handler1 = elem;
 
-    read_lock(&vmmio->lock);
+    if ( handler0->addr < handler1->addr )
+        return -1;
 
-    for ( i = 0; i < vmmio->num_entries; i++ )
-    {
-        handler = &vmmio->handlers[i];
+    if ( handler0->addr > (handler1->addr + handler1->size) )
+        return 1;
 
-        if ( (gpa >= handler->addr) &&
-             (gpa < (handler->addr + handler->size)) )
-            break;
-    }
+    return 0;
+}
 
-    if ( i == vmmio->num_entries )
-        handler = NULL;
+static const struct mmio_handler *find_mmio_handler(struct domain *d,
+                                                    paddr_t gpa)
+{
+    struct vmmio *vmmio = &d->arch.vmmio;
+    struct mmio_handler key = {.addr = gpa};
+    const struct mmio_handler *handler;
 
+    read_lock(&vmmio->lock);
+    handler = bsearch(&key, vmmio->handlers, vmmio->num_entries,
+                      sizeof(*handler), cmp_mmio_handler);
     read_unlock(&vmmio->lock);
 
     return handler;
@@ -131,6 +136,10 @@ void register_mmio_handler(struct domain *d,
 
     vmmio->num_entries++;
 
+    /* Sort mmio handlers in ascending order based on base address */
+    sort(vmmio->handlers, vmmio->num_entries, sizeof(struct mmio_handler),
+         cmp_mmio_handler, NULL);
+
     write_unlock(&vmmio->lock);
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#master

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