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.landwer...@intel.com>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_getparam.c | 4 ++++
drivers/gpu/drm/i915/i915_perf.c | 10 ++++++++++
drivers/gpu/drm/i915/i915_perf.h | 1 +
include/uapi/drm/i915_drm.h | 20 ++++++++++++++++++++
4 files changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_getparam.c
b/drivers/gpu/drm/i915/i915_getparam.c
index da6faa84e5b8..bd41cc5ce906 100644
--- 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)
@@ -157,6 +158,9 @@ 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 9d5a3522aa35..40a1ec2bc96b 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -3697,3 +3697,13 @@ void i915_perf_fini(struct drm_i915_private *dev_priv)
dev_priv->perf.initialized = false;
}
+
+/**
+ * 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;
+}
diff --git a/drivers/gpu/drm/i915/i915_perf.h b/drivers/gpu/drm/i915/i915_perf.h
index a412b16d9ffc..95549de65212 100644
--- a/drivers/gpu/drm/i915/i915_perf.h
+++ b/drivers/gpu/drm/i915/i915_perf.h
@@ -18,6 +18,7 @@ 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 3d031e81648b..e98c9a7baa91 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -618,6 +618,12 @@ typedef struct drm_i915_irq_wait {
*/
#define I915_PARAM_HAS_EXEC_TIMELINE_FENCES 54
+/*
+ * 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 55
+
/* Must be kept compact -- no holes and well documented */
typedef struct drm_i915_getparam {
@@ -1903,23 +1909,31 @@ 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,
@@ -1929,6 +1943,8 @@ 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,
@@ -1960,6 +1976,8 @@ 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)
@@ -1967,6 +1985,8 @@ 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)
--
2.23.0
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