tests: add gem_mmap_offset_exhaustion

This also adds a gem_madvise helper to lib/drmtest.c

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/lib/drmtest.c b/lib/drmtest.c
index 5caf71b..0f02190 100644 (file)
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -289,6 +289,20 @@ uint64_t gem_mappable_aperture_size(void)
        return pci_dev->regions[bar].size;
 }
 
+int gem_madvise(int fd, uint32_t handle, int state)
+{
+       struct drm_i915_gem_madvise madv;
+       int ret;
+
+       madv.handle = handle;
+       madv.madv = state;
+       madv.retained = 1;
+       ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_MADVISE, &madv);
+       assert(ret == 0);
+
+       return madv.retained;
+}
+
 /* signal interrupt helpers */
 static pid_t signal_helper = -1;
 long long int sig_stat;

diff --git a/lib/drmtest.h b/lib/drmtest.h
index a8438ab..9f19444 100644 (file)
--- a/lib/drmtest.h
+++ b/lib/drmtest.h
@@ -51,6 +51,7 @@ uint32_t gem_create(int fd, int size);
 void *gem_mmap(int fd, uint32_t handle, int size, int prot);
 uint64_t gem_aperture_size(int fd);
 uint64_t gem_mappable_aperture_size(void);
+int gem_madvise(int fd, uint32_t handle, int state);
 
 /* generally useful helpers */
 void drmtest_fork_signal_helper(void);

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 8df2572..4f2a30b 100644 (file)
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -18,6 +18,7 @@ TESTS_progs = \
        gem_ringfill \
        gem_mmap \
        gem_mmap_gtt \
+       gem_mmap_offset_exhaustion \
        gem_pwrite \
        gem_pread_after_blit \
        gem_tiled_pread \

diff --git a/tests/gem_mmap_offset_exhaustion.c b/tests/gem_mmap_offset_exhaustion.c
new file mode 100644 (file)
index 0000000..51ae599
--- /dev/null
+++ b/tests/gem_mmap_offset_exhaustion.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+
+#define OBJECT_SIZE (1024*1024)
+
+/* Testcase: checks whether the kernel handles mmap offset exhaustion correctly
+ *
+ * Currently the kernel doesn't reap the mmap offset of purged objects, albeit
+ * there's nothing that prevents it ABI-wise and it helps to get out of corners
+ * (because drm_mm is only 32bit on 32bit archs unfortunately.
+ *
+ * Note that on 64bit machines we have plenty of address space (because drm_mm
+ * uses unsigned long).
+ */
+
+static void
+create_and_map_bo(int fd)
+{
+       uint32_t handle;
+       char *ptr;
+
+       handle = gem_create(fd, OBJECT_SIZE);
+
+       ptr = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
+
+       if (!ptr) {
+               fprintf(stderr, "mmap failed\n");
+               assert(ptr);
+       }
+
+       /* touch it to force it into the gtt */
+       *ptr = 0;
+
+       /* but then unmap it again because we only have limited address space on
+        * 32 bit */
+       munmap(ptr, OBJECT_SIZE);
+
+       /* we happily leak objects to exhaust mmap offset space, the kernel will
+        * reap backing storage. */
+       gem_madvise(fd, handle, I915_MADV_DONTNEED);
+}
+
+int main(int argc, char **argv)
+{
+       int fd, i;
+
+       fd = drm_open_any();
+
+       /* we have 32bit of address space, so try to fit one MB more
+        * than that. */
+       for (i = 0; i < 4096 + 1; i++)
+               create_and_map_bo(fd);
+
+       close(fd);
+
+       return 0;
+}