drm/i915/perf: introduce a versioning of the i915-perf uapi

Reporting this version will help application figure out what level of
the support the running kernel provides.

v2: Add i915_perf_ioctl_version() (Chris)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191014201404.22468-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c
index f4b3cbb..ad33fbe 100644 (file)
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -5,6 +5,7 @@
 #include "gt/intel_engine_user.h"
 
 #include "i915_drv.h"
+#include "i915_perf.h"
 
 int i915_getparam_ioctl(struct drm_device *dev, void *data,
                        struct drm_file *file_priv)
@@ -156,6 +157,9 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
        case I915_PARAM_MMAP_GTT_COHERENT:
                value = INTEL_INFO(i915)->has_coherent_ggtt;
                break;
+       case I915_PARAM_PERF_REVISION:
+               value = i915_perf_ioctl_version();
+               break;
        default:
                DRM_DEBUG("Unknown parameter %d\n", param->param);
                return -EINVAL;

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 3665807..220e338 100644 (file)
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -4017,6 +4017,16 @@ void i915_perf_fini(struct drm_i915_private *i915)
        perf->i915 = NULL;
 }
 
+/**
+ * i915_perf_ioctl_version - Version of the i915-perf subsystem
+ *
+ * This version number is used by userspace to detect available features.
+ */
+int i915_perf_ioctl_version(void)
+{
+       return 1;
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/i915_perf.c"
 #endif

diff --git a/drivers/gpu/drm/i915/i915_perf.h b/drivers/gpu/drm/i915/i915_perf.h
index 98e16be..4ceebce 100644 (file)
--- a/drivers/gpu/drm/i915/i915_perf.h
+++ b/drivers/gpu/drm/i915/i915_perf.h
@@ -22,6 +22,7 @@ void i915_perf_init(struct drm_i915_private *i915);
 void i915_perf_fini(struct drm_i915_private *i915);
 void i915_perf_register(struct drm_i915_private *i915);
 void i915_perf_unregister(struct drm_i915_private *i915);
+int i915_perf_ioctl_version(void);
 
 int i915_perf_open_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file);

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 30c5421..c50c712 100644 (file)
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -611,6 +611,13 @@ typedef struct drm_i915_irq_wait {
  * See I915_EXEC_FENCE_OUT and I915_EXEC_FENCE_SUBMIT.
  */
 #define I915_PARAM_HAS_EXEC_SUBMIT_FENCE 53
+
+/*
+ * Revision of the i915-perf uAPI. The value returned helps determine what
+ * i915-perf features are available. See drm_i915_perf_property_id.
+ */
+#define I915_PARAM_PERF_REVISION       54
+
 /* Must be kept compact -- no holes and well documented */
 
 typedef struct drm_i915_getparam {
@@ -1844,23 +1851,31 @@ enum drm_i915_perf_property_id {
         * Open the stream for a specific context handle (as used with
         * execbuffer2). A stream opened for a specific context this way
         * won't typically require root privileges.
+        *
+        * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_CTX_HANDLE = 1,
 
        /**
         * A value of 1 requests the inclusion of raw OA unit reports as
         * part of stream samples.
+        *
+        * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_SAMPLE_OA,
 
        /**
         * The value specifies which set of OA unit metrics should be
         * be configured, defining the contents of any OA unit reports.
+        *
+        * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_OA_METRICS_SET,
 
        /**
         * The value specifies the size and layout of OA unit reports.
+        *
+        * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_OA_FORMAT,
 
@@ -1870,6 +1885,8 @@ enum drm_i915_perf_property_id {
         * from this exponent as follows:
         *
         *   80ns * 2^(period_exponent + 1)
+        *
+        * This property is available in perf revision 1.
         */
        DRM_I915_PERF_PROP_OA_EXPONENT,
 
@@ -1901,6 +1918,8 @@ struct drm_i915_perf_open_param {
  * to close and re-open a stream with the same configuration.
  *
  * It's undefined whether any pending data for the stream will be lost.
+ *
+ * This ioctl is available in perf revision 1.
  */
 #define I915_PERF_IOCTL_ENABLE _IO('i', 0x0)
 
@@ -1908,6 +1927,8 @@ struct drm_i915_perf_open_param {
  * Disable data capture for a stream.
  *
  * It is an error to try and read a stream that is disabled.
+ *
+ * This ioctl is available in perf revision 1.
  */
 #define I915_PERF_IOCTL_DISABLE        _IO('i', 0x1)