i915: Add gem_vm_create

Exercise basic creation and swapping between new address spaces.

v2: Check isolation that the same vm_id on different fd are indeed
different VM.
v3: Cross-over check with CREATE_EXT_SETPARAM

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/lib/i915/gem_vm.c b/lib/i915/gem_vm.c
new file mode 100644
index 00000000..9a022a56
--- /dev/null
+++ b/lib/i915/gem_vm.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright © 2019 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.
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include "ioctl_wrappers.h"
+#include "drmtest.h"
+
+#include "i915/gem_vm.h"
+
+/**
+ * SECTION:gem_vm
+ * @short_description: Helpers for dealing with address spaces (vm/GTT)
+ * @title: GEM Virtual Memory
+ *
+ * This helper library contains functions used for handling gem address
+ * spaces.
+ */
+
+/**
+ * gem_has_vm:
+ * @i915: open i915 drm file descriptor
+ *
+ * Returns: whether VM creation is supported or not.
+ */
+bool gem_has_vm(int i915)
+{
+	uint32_t vm_id = 0;
+
+	__gem_vm_create(i915, &vm_id);
+	if (vm_id)
+		gem_vm_destroy(i915, vm_id);
+
+	return vm_id;
+}
+
+/**
+ * gem_require_vm:
+ * @i915: open i915 drm file descriptor
+ *
+ * This helper will automatically skip the test on platforms where address
+ * space creation is not available.
+ */
+void gem_require_vm(int i915)
+{
+	igt_require(gem_has_vm(i915));
+}
+
+int __gem_vm_create(int i915, uint32_t *vm_id)
+{
+       struct drm_i915_gem_vm_control ctl = {};
+       int err = 0;
+
+       if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_VM_CREATE, &ctl) == 0) {
+               *vm_id = ctl.vm_id;
+       } else {
+	       err = -errno;
+	       igt_assume(err != 0);
+       }
+
+       errno = 0;
+       return err;
+}
+
+/**
+ * gem_vm_create:
+ * @i915: open i915 drm file descriptor
+ *
+ * This wraps the VM_CREATE ioctl, which is used to allocate a new
+ * address space for use with GEM contexts.
+ *
+ * Returns: The id of the allocated address space.
+ */
+uint32_t gem_vm_create(int i915)
+{
+	uint32_t vm_id;
+
+	igt_assert_eq(__gem_vm_create(i915, &vm_id), 0);
+	igt_assert(vm_id != 0);
+
+	return vm_id;
+}
+
+int __gem_vm_destroy(int i915, uint32_t vm_id)
+{
+	struct drm_i915_gem_vm_control ctl = { .vm_id = vm_id };
+	int err = 0;
+
+	if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_VM_DESTROY, &ctl)) {
+		err = -errno;
+		igt_assume(err);
+	}
+
+	errno = 0;
+	return err;
+}
+
+/**
+ * gem_vm_destroy:
+ * @i915: open i915 drm file descriptor
+ * @vm_id: i915 VM id
+ *
+ * This wraps the VM_DESTROY ioctl, which is used to free an address space
+ * handle.
+ */
+void gem_vm_destroy(int i915, uint32_t vm_id)
+{
+	igt_assert_eq(__gem_vm_destroy(i915, vm_id), 0);
+}