[PATCH 41/99] drm/i915: Provide a hook for selftests
Chris Wilson
chris at chris-wilson.co.uk
Sat Dec 17 18:04:38 UTC 2016
Some pieces of code are independent of hardware but are very tricky to
exercise through the normal userspace ABI or via debugfs hooks. Being
able to create mock unit tests and execute them through CI is vital.
Start by adding a central point where we can execute unit tests and
a parameter to enable them. This is disabled by default as the
expectation is that these tests will occasionally explode.
To facilitate integration with igt, any parameter beginning with
i915.igt__ is interpreted as a subtest executable independently via
igt/drv_selftest.
Two classes of selftests are recognised: mock unit tests and integration
tests. Mock unit tests are run as soon as the module is loaded, before
the device is probed. At that point there is no driver instantiated and
all hw interactions must be "mocked". This is very useful for writing
universal tests to exercise code not typically run on a broad range of
architectures. Alternatively, you can hook into the late selftests and
run when the device has been instantiated - hw interactions are real.
v2: Add a macro for compiling conditional code for mock objects inside
real objects.
v3: Differentiate between mock unit tests and late integration test.
v4: List the tests in natural order, use igt to sort after modparam.
v5: s/late/live/
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com> #v1
---
drivers/gpu/drm/i915/Kconfig.debug | 15 ++
drivers/gpu/drm/i915/Makefile | 3 +
drivers/gpu/drm/i915/i915_pci.c | 19 +-
drivers/gpu/drm/i915/i915_selftest.h | 86 +++++++++
.../gpu/drm/i915/selftests/i915_live_selftests.h | 11 ++
.../gpu/drm/i915/selftests/i915_mock_selftests.h | 11 ++
drivers/gpu/drm/i915/selftests/i915_selftest.c | 205 +++++++++++++++++++++
7 files changed, 349 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/i915/i915_selftest.h
create mode 100644 drivers/gpu/drm/i915/selftests/i915_live_selftests.h
create mode 100644 drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
create mode 100644 drivers/gpu/drm/i915/selftests/i915_selftest.c
diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
index 598551dbf62c..de051502e891 100644
--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -26,6 +26,7 @@ config DRM_I915_DEBUG
select DRM_DEBUG_MM if DRM=y
select DRM_DEBUG_MM_SELFTEST
select DRM_I915_SW_FENCE_DEBUG_OBJECTS
+ select DRM_I915_SELFTEST
default n
help
Choose this option to turn on extra driver debugging that may affect
@@ -59,3 +60,17 @@ config DRM_I915_SW_FENCE_DEBUG_OBJECTS
Recommended for driver developers only.
If in doubt, say "N".
+
+config DRM_I915_SELFTEST
+ bool "Enable selftests upon driver load"
+ depends on DRM_I915
+ default n
+ help
+ Choose this option to allow the driver to perform selftests upon
+ loading; also requires the i915.selftest=1 module parameter. To
+ exit the module after running the selftests (i.e. to prevent normal
+ module initialisation afterwards) use i915.selftest=-1.
+
+ Recommended for driver developers only.
+
+ If in doubt, say "N".
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 5196509e71cf..461aeb44a9ad 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -3,6 +3,7 @@
# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
subdir-ccflags-$(CONFIG_DRM_I915_WERROR) := -Werror
+subdir-ccflags-$(CONFIG_DRM_I915_SELFTEST) := -I$(src) -I$(src)/selftests
subdir-ccflags-y += \
$(call as-instr,movntdqa (%eax)$(comma)%xmm0,-DCONFIG_AS_MOVNTDQA)
@@ -114,6 +115,8 @@ i915-y += dvo_ch7017.o \
# Post-mortem debug and GPU hang state capture
i915-$(CONFIG_DRM_I915_CAPTURE_ERROR) += i915_gpu_error.o
+i915-$(CONFIG_DRM_I915_SELFTEST) += \
+ selftests/i915_selftest.o
# virtual gpu code
i915-y += i915_vgpu.o
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 93f50ef2a309..e053f7d1a574 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -27,6 +27,7 @@
#include <linux/vga_switcheroo.h>
#include "i915_drv.h"
+#include "i915_selftest.h"
#define GEN_DEFAULT_PIPEOFFSETS \
.pipe_offsets = { PIPE_A_OFFSET, PIPE_B_OFFSET, \
@@ -475,6 +476,7 @@ static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct intel_device_info *intel_info =
(struct intel_device_info *) ent->driver_data;
+ int err;
if (IS_ALPHA_SUPPORT(intel_info) && !i915.alpha_support) {
DRM_INFO("The driver support for your hardware in this kernel version is alpha quality\n"
@@ -498,7 +500,17 @@ static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
if (vga_switcheroo_client_probe_defer(pdev))
return -EPROBE_DEFER;
- return i915_driver_load(pdev, ent);
+ err = i915_driver_load(pdev, ent);
+ if (err)
+ return err;
+
+ err = i915_live_selftests(pdev);
+ if (err) {
+ i915_driver_unload(pci_get_drvdata(pdev));
+ return err > 0 ? -ENOTTY : err;
+ }
+
+ return 0;
}
static void i915_pci_remove(struct pci_dev *pdev)
@@ -520,6 +532,11 @@ static struct pci_driver i915_pci_driver = {
static int __init i915_init(void)
{
bool use_kms = true;
+ int err;
+
+ err = i915_mock_selftests();
+ if (err)
+ return err > 0 ? 0 : err;
/*
* Enable KMS by default, unless explicitly overriden by
diff --git a/drivers/gpu/drm/i915/i915_selftest.h b/drivers/gpu/drm/i915/i915_selftest.h
new file mode 100644
index 000000000000..7495b10cd87b
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_selftest.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2016 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.
+ */
+
+#ifndef __I915_SELFTEST_H__
+#define __I915_SELFTEST_H__
+
+struct pci_dev;
+struct drm_i915_private;
+
+struct i915_selftest_params {
+ unsigned int random_seed;
+ int mock;
+ int live;
+};
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+extern struct i915_selftest_params i915_selftest_params;
+
+int i915_mock_selftests(void);
+int i915_live_selftests(struct pci_dev *pdev);
+
+/* We extract the function declarations from i915_mock_selftests.h and
+ * i915_live_selftests.h Add your unit test declarations there!
+ *
+ * Mock unit tests are run very early upon module load, before the driver
+ * is probed. All hardware interactions, as well as other subsystems, must
+ * be "mocked".
+ *
+ * Late unit tests are run after the driver is loaded - all hardware
+ * interactions are real.
+ */
+#define selftest(name, func) int func(void);
+#include "i915_mock_selftests.h"
+#undef selftest
+#define selftest(name, func) int func(struct drm_i915_private *i915);
+#include "i915_live_selftests.h"
+#undef selftest
+
+struct i915_subtest {
+ int (*func)(void *data);
+ const char *name;
+};
+
+int __i915_subtests(const char *caller,
+ const struct i915_subtest *st,
+ int count,
+ void *data);
+#define i915_subtests(T, data) \
+ __i915_subtests(__func__, T, ARRAY_SIZE(T), data)
+
+#define SUBTEST(x) { x, #x }
+
+#define I915_SELFTEST_DECLARE(x) x
+#define I915_SELFTEST_ONLY(x) unlikely(x)
+
+#else /* !IS_ENABLED(CONFIG_DRM_I915_SELFTEST) */
+
+static inline int i915_mock_selftests(void) { return 0; }
+static inline int i915_live_selftests(struct pci_dev *pdev) { return 0; }
+
+#define I915_SELFTEST_DECLARE(x)
+#define I915_SELFTEST_ONLY(x) 0
+
+#endif
+
+#endif /* !__I915_SELFTEST_H__ */
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
new file mode 100644
index 000000000000..f3e17cb10e05
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -0,0 +1,11 @@
+/* List each unit test as selftest(name, function)
+ *
+ * The name is used as both an enum and expanded as subtest__name to create
+ * a module parameter. It must be unique and legal for a C identifier.
+ *
+ * The function should be of type int function(void). It may be conditionally
+ * compiled using #if IS_ENABLED(DRM_I915_SELFTEST).
+ *
+ * Tests are executed in order by igt/drv_selftest
+ */
+selftest(sanitycheck, i915_live_sanitycheck) /* keep first (igt selfcheck) */
diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
new file mode 100644
index 000000000000..69e97a2ba4a6
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
@@ -0,0 +1,11 @@
+/* List each unit test as selftest(name, function)
+ *
+ * The name is used as both an enum and expanded as subtest__name to create
+ * a module parameter. It must be unique and legal for a C identifier.
+ *
+ * The function should be of type int function(void). It may be conditionally
+ * compiled using #if IS_ENABLED(DRM_I915_SELFTEST).
+ *
+ * Tests are executed in order by igt/drv_selftest
+ */
+selftest(sanitycheck, i915_mock_sanitycheck) /* keep first (igt selfcheck) */
diff --git a/drivers/gpu/drm/i915/selftests/i915_selftest.c b/drivers/gpu/drm/i915/selftests/i915_selftest.c
new file mode 100644
index 000000000000..5b7c9a642d37
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/i915_selftest.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright © 2016 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 <linux/random.h>
+
+#include "i915_drv.h"
+#include "i915_selftest.h"
+
+struct i915_selftest_params i915_selftest_params __read_mostly;
+
+int i915_mock_sanitycheck(void)
+{
+ pr_info("i915: %s() - ok!\n", __func__);
+ return 0;
+}
+
+int i915_live_sanitycheck(struct drm_i915_private *i915)
+{
+ pr_info("%s: %s() - ok!\n", i915->drm.driver->name, __func__);
+ return 0;
+}
+
+enum {
+#define selftest(name, func) mock_##name,
+#include "i915_mock_selftests.h"
+#undef selftest
+};
+enum {
+#define selftest(name, func) live_##name,
+#include "i915_live_selftests.h"
+#undef selftest
+};
+
+struct i915_selftest {
+ bool enabled;
+ const char *name;
+ union {
+ int (*mock)(void);
+ int (*live)(struct drm_i915_private *);
+ };
+};
+
+#define selftest(n, f) [mock_##n] = { .name = #n, .mock = f },
+static struct i915_selftest mock_selftests[] = {
+#include "i915_mock_selftests.h"
+};
+#undef selftest
+
+#define selftest(n, f) [live_##n] = { .name = #n, .live = f },
+static struct i915_selftest live_selftests[] = {
+#include "i915_live_selftests.h"
+};
+#undef selftest
+
+/* Embed the line number into the parameter name so that we can order tests */
+#define selftest(n, func) selftest_0(n, func, param(n))
+#define param(n) __PASTE(igt__, __PASTE(__PASTE(__LINE__, __), mock_##n))
+#define selftest_0(n, func, id) \
+module_param_named(id, mock_selftests[mock_##n].enabled, bool, 0400);
+#include "i915_mock_selftests.h"
+#undef selftest_0
+#undef param
+
+#define param(n) __PASTE(igt__, __PASTE(__PASTE(__LINE__, __), live_##n))
+#define selftest_0(n, func, id) \
+module_param_named(id, live_selftests[live_##n].enabled, bool, 0400);
+#include "i915_live_selftests.h"
+#undef selftest_0
+#undef param
+#undef selftest
+
+static void set_default_test_all(struct i915_selftest *st, unsigned long count)
+{
+ unsigned long i;
+
+ for (i = 0; i < count; i++)
+ if (st[i].enabled)
+ return;
+
+ for (i = 0; i < count; i++)
+ st[i].enabled = true;
+}
+
+static int run_selftests(const char *name,
+ struct i915_selftest *st,
+ unsigned long count,
+ void *data)
+{
+ int err = 0;
+
+ while (!i915_selftest_params.random_seed)
+ i915_selftest_params.random_seed = get_random_int();
+
+ set_default_test_all(st, count);
+
+ pr_info("i915: Performing %s selftests with random_seed=%x\n",
+ name, i915_selftest_params.random_seed);
+
+ /* Tests are listed in order in i915_*_selftests.h */
+ for (; count--; st++) {
+ if (!st->enabled)
+ continue;
+
+ pr_debug("i915: Running %s\n", st->name);
+ if (data)
+ err = st->live(data);
+ else
+ err = st->mock();
+ if (err)
+ break;
+ }
+
+ if (WARN(err > 0 || err == -ENOTTY,
+ "%s returned %d, conflicting with selftest's magic values!\n",
+ st->name, err))
+ err = -1;
+
+ rcu_barrier();
+ return err;
+}
+
+#define run_selftests(x, data) \
+ (run_selftests)(#x, x##_selftests, ARRAY_SIZE(x##_selftests), data)
+
+int i915_mock_selftests(void)
+{
+ int err;
+
+ if (!i915_selftest_params.mock)
+ return 0;
+
+ err = run_selftests(mock, NULL);
+ if (err)
+ return err;
+
+ if (i915_selftest_params.mock < 0)
+ return 1;
+
+ return 0;
+}
+
+int i915_live_selftests(struct pci_dev *pdev)
+{
+ int err;
+
+ if (!i915_selftest_params.live)
+ return 0;
+
+ err = run_selftests(live, to_i915(pci_get_drvdata(pdev)));
+ if (err)
+ return err;
+
+ if (i915_selftest_params.live < 0)
+ return 1;
+
+ return 0;
+}
+
+int __i915_subtests(const char *caller,
+ const struct i915_subtest *st,
+ int count,
+ void *data)
+{
+ int err;
+
+ for (; count--; st++) {
+ pr_debug("i915: Running %s/%s\n", caller, st->name);
+ err = st->func(data);
+ if (err) {
+ pr_err("i915/%s: %s failed with error %d\n",
+ caller, st->name, err);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+module_param_named(random_seed, i915_selftest_params.random_seed, uint, 0400);
+
+module_param_named_unsafe(mock_selftests, i915_selftest_params.mock, int, 0400);
+MODULE_PARM_DESC(mock_selftests, "Run selftests before loading, using mock hardware (0:disabled [default], 1:run tests then load driver, -1:run tests then exit module)");
+
+module_param_named_unsafe(live_selftests, i915_selftest_params.live, int, 0400);
+MODULE_PARM_DESC(live_selftests, "Run selftests after driver initialisation on the live system (0:disabled [default], 1:run tests then continue, -1:run tests then exit module)");
--
2.11.0
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