Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
lib/ioctl_wrappers.c | 81 +++++++++++
lib/ioctl_wrappers.h | 5 +
tests/.gitignore | 1 +
tests/Makefile.am | 2 +
tests/Makefile.sources | 1 +
tests/gem_mmap_wc.c | 370 +++++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 460 insertions(+)
create mode 100644 tests/gem_mmap_wc.c
diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index f423237..8316f0d 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -463,10 +463,91 @@ void *gem_mmap__gtt(int fd, uint32_t handle, int size,
int prot)
ptr = mmap64(0, size, prot, MAP_SHARED, fd, mmap_arg.offset);
if (ptr == MAP_FAILED)
ptr = NULL;
+ else
+ errno = 0;
return ptr;
}
+struct local_i915_gem_mmap_v2 {
+ uint32_t handle;
+ uint32_t pad;
+ uint64_t offset;
+ uint64_t size;
+ uint64_t addr_ptr;
+ uint64_t flags;
+#define I915_MMAP_WC 0x1
+};
+#define LOCAL_IOCTL_I915_GEM_MMAP_v2 DRM_IOWR(DRM_COMMAND_BASE +
DRM_I915_GEM_MMAP, struct local_i915_gem_mmap_v2)
+
+bool gem_mmap__has_wc(int fd)
+{
+ static int has_wc = -1;
+
+ if (has_wc == -1) {
+ struct drm_i915_getparam gp;
+ int val = -1;
+
+ has_wc = 0;
+
+ memset(&gp, 0, sizeof(gp));
+ gp.param = 29; /* MMAP_VERSION */
+ gp.value = &val;
+
+ /* Do we have the new mmap_ioctl? */
+ ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+ if (val >= 1) {
+ struct local_i915_gem_mmap_v2 arg;
+
+ /* Does this device support wc-mmaps ? */
+ memset(&arg, 0, sizeof(arg));
+ arg.handle = gem_create(fd, 4096);
+ arg.offset = 0;
+ arg.size = 4096;
+ arg.flags = I915_MMAP_WC;
+ has_wc = drmIoctl(fd, LOCAL_IOCTL_I915_GEM_MMAP_v2,
&arg) == 0;
+ gem_close(fd, arg.handle);
+ }
+ errno = 0;
+ }
+
+ return has_wc > 0;
+}
+
+/**
+ * gem_mmap__wc:
+ * @fd: open i915 drm file descriptor
+ * @handle: gem buffer object handle
+ * @offset: offset in the gem buffer of te mmap arena
+ * @size: size of the mmap arena
+ * @prot: memory protection bits as used by mmap()
+ *
+ * This functions wraps up procedure to establish a memory mapping through
+ * direct cpu access, bypassing the gpu and cpu caches completely.
+ *
+ * Returns: A pointer to the created memory mapping.
+ */
+void *gem_mmap__wc(int fd, uint32_t handle, int offset, int size, int prot)
+{
+ struct local_i915_gem_mmap_v2 arg;
+
+ if (!gem_mmap__has_wc(fd)) {
+ errno = ENOSYS;
+ return NULL;
+ }
+
+ memset(&arg, 0, sizeof(arg));
+ arg.handle = handle;
+ arg.offset = offset;
+ arg.size = size;
+ arg.flags = I915_MMAP_WC;
+ if (drmIoctl(fd, LOCAL_IOCTL_I915_GEM_MMAP_v2, &arg))
+ return NULL;
+
+ errno = 0;
+ return (void *)(uintptr_t)arg.addr_ptr;
+}
+
/**
* gem_mmap__cpu:
* @fd: open i915 drm file descriptor
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index d13408c..9e7edad 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -62,6 +62,11 @@ void gem_execbuf(int fd, struct drm_i915_gem_execbuffer2
*execbuf);
void *gem_mmap__gtt(int fd, uint32_t handle, int size, int prot);
void *gem_mmap__cpu(int fd, uint32_t handle, int offset, int size, int prot);
+
+bool gem_mmap__has_wc(int fd);
+void *gem_mmap__wc(int fd, uint32_t handle, int offset, int size, int prot);
+#define igt_require_mmap_wc(x) igt_require(gem_mmap__has_wc(x))
+
/**
* gem_mmap:
*
diff --git a/tests/.gitignore b/tests/.gitignore
index 6e6ab58..07d3b5a 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -58,6 +58,7 @@ gem_madvise
gem_media_fill
gem_mmap
gem_mmap_gtt
+gem_mmap_wc
gem_mmap_offset_exhaustion
gem_multi_bsd_sync_loop
gem_non_secure_batch
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3762737..78cbe04 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -58,6 +58,8 @@ gem_flink_race_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
gem_flink_race_LDADD = $(LDADD) -lpthread
gem_mmap_gtt_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
gem_mmap_gtt_LDADD = $(LDADD) -lpthread
+gem_mmap_wc_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
+gem_mmap_wc_LDADD = $(LDADD) -lpthread
gem_threaded_access_tiled_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
gem_threaded_access_tiled_LDADD = $(LDADD) -lpthread
gem_tiled_swapping_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 2677bf7..97aab02 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -42,6 +42,7 @@ TESTS_progs_M = \
gem_madvise \
gem_mmap \
gem_mmap_gtt \
+ gem_mmap_wc \
gem_partial_pwrite_pread \
gem_persistent_relocs \
gem_pipe_control_store_loop \
diff --git a/tests/gem_mmap_wc.c b/tests/gem_mmap_wc.c
new file mode 100644
index 0000000..87140ff
--- /dev/null
+++ b/tests/gem_mmap_wc.c
@@ -0,0 +1,370 @@
+/*
+ * Copyright © 2011 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:
+ * Chris Wilson <ch...@chris-wilson.co.uk>
+ *
+ */
+
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include "drm.h"
+#include "ioctl_wrappers.h"
+#include "drmtest.h"
+#include "igt_debugfs.h"
+
+static int OBJECT_SIZE = 16*1024*1024;
+
+static void set_domain(int fd, uint32_t handle)
+{
+ gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
+}
+
+static void *
+mmap_bo(int fd, uint32_t handle)
+{
+ void *ptr;
+
+ ptr = gem_mmap__wc(fd, handle, 0, OBJECT_SIZE, PROT_READ | PROT_WRITE);
+ igt_assert(ptr && ptr != MAP_FAILED);
+
+ return ptr;
+}
+
+static void *
+create_pointer(int fd)
+{
+ uint32_t handle;
+ void *ptr;
+
+ handle = gem_create(fd, OBJECT_SIZE);
+
+ ptr = mmap_bo(fd, handle);
+ set_domain(fd, handle);
+
+ gem_close(fd, handle);
+
+ return ptr;
+}
+
+static void
+test_copy(int fd)
+{
+ void *src, *dst;
+
+ igt_require_mmap_wc(fd);
+
+ /* copy from a fresh src to fresh dst to force pagefault on both */
+ src = create_pointer(fd);
+ dst = create_pointer(fd);
+
+ memcpy(dst, src, OBJECT_SIZE);
+ memcpy(src, dst, OBJECT_SIZE);
+
+ munmap(dst, OBJECT_SIZE);
+ munmap(src, OBJECT_SIZE);
+}
+
+enum test_read_write {
+ READ_BEFORE_WRITE,
+ READ_AFTER_WRITE,
+};
+
+static void
+test_read_write(int fd, enum test_read_write order)
+{
+ uint32_t handle;
+ void *ptr;
+ volatile uint32_t val = 0;
+
+ handle = gem_create(fd, OBJECT_SIZE);
+ set_domain(fd, handle);
+
+ ptr = mmap_bo(fd, handle);
+ igt_assert(ptr != MAP_FAILED);
+
+ if (order == READ_BEFORE_WRITE) {
+ val = *(uint32_t *)ptr;
+ *(uint32_t *)ptr = val;
+ } else {
+ *(uint32_t *)ptr = val;
+ val = *(uint32_t *)ptr;
+ }
+
+ gem_close(fd, handle);
+ munmap(ptr, OBJECT_SIZE);
+}
+
+static void
+test_read_write2(int fd, enum test_read_write order)
+{
+ uint32_t handle;
+ void *r, *w;
+ volatile uint32_t val = 0;
+
+ igt_require_mmap_wc(fd);
+
+ handle = gem_create(fd, OBJECT_SIZE);
+ set_domain(fd, handle);
+
+ r = gem_mmap__wc(fd, handle, 0, OBJECT_SIZE, PROT_READ);
+ igt_assert(r != MAP_FAILED);
+
+ w = gem_mmap__wc(fd, handle, 0, OBJECT_SIZE, PROT_READ | PROT_WRITE);
+ igt_assert(w != MAP_FAILED);
+
+ if (order == READ_BEFORE_WRITE) {
+ val = *(uint32_t *)r;
+ *(uint32_t *)w = val;
+ } else {
+ *(uint32_t *)w = val;
+ val = *(uint32_t *)r;
+ }
+
+ gem_close(fd, handle);
+ munmap(r, OBJECT_SIZE);
+ munmap(w, OBJECT_SIZE);
+}
+
+static void
+test_write(int fd)
+{
+ void *src;
+ uint32_t dst;
+
+ igt_require_mmap_wc(fd);
+
+ /* copy from a fresh src to fresh dst to force pagefault on both */
+ src = create_pointer(fd);
+ dst = gem_create(fd, OBJECT_SIZE);
+
+ gem_write(fd, dst, 0, src, OBJECT_SIZE);
+
+ gem_close(fd, dst);
+ munmap(src, OBJECT_SIZE);
+}
+
+static void
+test_write_gtt(int fd)
+{
+ uint32_t dst;
+ char *dst_gtt;
+ void *src;
+
+ igt_require_mmap_wc(fd);
+
+ dst = gem_create(fd, OBJECT_SIZE);
+ set_domain(fd, dst);
+
+ /* prefault object into gtt */
+ dst_gtt = mmap_bo(fd, dst);
+ memset(dst_gtt, 0, OBJECT_SIZE);
+ munmap(dst_gtt, OBJECT_SIZE);
+
+ src = create_pointer(fd);
+
+ gem_write(fd, dst, 0, src, OBJECT_SIZE);
+
+ gem_close(fd, dst);
+ munmap(src, OBJECT_SIZE);
+}
+
+static void
+test_read(int fd)
+{
+ void *dst;
+ uint32_t src;
+
+ igt_require_mmap_wc(fd);
+
+ /* copy from a fresh src to fresh dst to force pagefault on both */
+ dst = create_pointer(fd);
+ src = gem_create(fd, OBJECT_SIZE);
+
+ gem_read(fd, src, 0, dst, OBJECT_SIZE);
+
+ gem_close(fd, src);
+ munmap(dst, OBJECT_SIZE);
+}
+
+static void
+test_write_cpu_read_wc(int fd)
+{
+ uint32_t handle;
+ uint32_t *src, *dst;
+
+ igt_require_mmap_wc(fd);
+
+ handle = gem_create(fd, OBJECT_SIZE);
+
+ dst = gem_mmap__wc(fd, handle, 0, OBJECT_SIZE, PROT_READ);
+ igt_assert(dst != (uint32_t *)MAP_FAILED);
+
+ src = gem_mmap__cpu(fd, handle, 0, OBJECT_SIZE, PROT_WRITE);
+ igt_assert(src != (uint32_t *)MAP_FAILED);
+
+ gem_close(fd, handle);
+
+ memset(src, 0xaa, OBJECT_SIZE);
+ set_domain(fd, handle);
+ igt_assert(memcmp(dst, src, OBJECT_SIZE) == 0);
+
+ munmap(src, OBJECT_SIZE);
+ munmap(dst, OBJECT_SIZE);
+}
+
+static void
+test_write_gtt_read_wc(int fd)
+{
+ uint32_t handle;
+ uint32_t *src, *dst;
+
+ igt_require_mmap_wc(fd);
+
+ handle = gem_create(fd, OBJECT_SIZE);
+ set_domain(fd, handle);
+
+ dst = gem_mmap__wc(fd, handle, 0, OBJECT_SIZE, PROT_READ);
+ igt_assert(dst != (uint32_t *)MAP_FAILED);
+
+ src = gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_WRITE);
+ igt_assert(src != (uint32_t *)MAP_FAILED);
+
+ gem_close(fd, handle);
+
+ memset(src, 0xaa, OBJECT_SIZE);
+ igt_assert(memcmp(dst, src, OBJECT_SIZE) == 0);
+
+ munmap(src, OBJECT_SIZE);
+ munmap(dst, OBJECT_SIZE);
+}
+
+struct thread_fault_concurrent {
+ pthread_t thread;
+ int id;
+ uint32_t **ptr;
+};
+
+static void *
+thread_fault_concurrent(void *closure)
+{
+ struct thread_fault_concurrent *t = closure;
+ uint32_t val = 0;
+ int n;
+
+ for (n = 0; n < 32; n++) {
+ if (n & 1)
+ *t->ptr[(n + t->id) % 32] = val;
+ else
+ val = *t->ptr[(n + t->id) % 32];
+ }
+
+ return NULL;
+}
+
+static void
+test_fault_concurrent(int fd)
+{
+ uint32_t *ptr[32];
+ struct thread_fault_concurrent thread[64];
+ int n;
+
+ igt_require_mmap_wc(fd);
+
+ for (n = 0; n < 32; n++) {
+ ptr[n] = create_pointer(fd);
+ }
+
+ for (n = 0; n < 64; n++) {
+ thread[n].ptr = ptr;
+ thread[n].id = n;
+ pthread_create(&thread[n].thread, NULL,
thread_fault_concurrent, &thread[n]);
+ }
+
+ for (n = 0; n < 64; n++)
+ pthread_join(thread[n].thread, NULL);
+
+ for (n = 0; n < 32; n++) {
+ munmap(ptr[n], OBJECT_SIZE);
+ }
+}
+
+static void
+run_without_prefault(int fd,
+ void (*func)(int fd))
+{
+ igt_disable_prefault();
+ func(fd);
+ igt_enable_prefault();
+}
+
+int fd;
+
+igt_main
+{
+ if (igt_run_in_simulation())
+ OBJECT_SIZE = 1 * 1024 * 1024;
+
+ igt_fixture
+ fd = drm_open_any();
+
+ igt_subtest("copy")
+ test_copy(fd);
+ igt_subtest("read")
+ test_read(fd);
+ igt_subtest("write")
+ test_write(fd);
+ igt_subtest("write-gtt")
+ test_write_gtt(fd);
+ igt_subtest("read-write")
+ test_read_write(fd, READ_BEFORE_WRITE);
+ igt_subtest("write-read")
+ test_read_write(fd, READ_AFTER_WRITE);
+ igt_subtest("read-write-distinct")
+ test_read_write2(fd, READ_BEFORE_WRITE);
+ igt_subtest("write-read-distinct")
+ test_read_write2(fd, READ_AFTER_WRITE);
+ igt_subtest("fault-concurrent")
+ test_fault_concurrent(fd);
+ igt_subtest("read-no-prefault")
+ run_without_prefault(fd, test_read);
+ igt_subtest("write-no-prefault")
+ run_without_prefault(fd, test_write);
+ igt_subtest("write-gtt-no-prefault")
+ run_without_prefault(fd, test_write_gtt);
+ igt_subtest("write-cpu-read-wc")
+ test_write_cpu_read_wc(fd);
+ igt_subtest("write-gtt-read-wc")
+ test_write_gtt_read_wc(fd);
+
+ igt_fixture
+ close(fd);
+}
--
1.9.1
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