We want the ability to dispatch a set of command buffer to the
hardware, each with a different OA configuration. To achieve this, we
reuse a couple of fields from the execbuf2 struct (I CAN HAZ
execbuf3?) to notify what OA configuration should be used for a batch
buffer. This requires the process making the execbuf with this flag to
also own the perf fd at the time of execbuf.
v2: Add a emit_oa_config() vfunc in the intel_engine_cs (Chris)
Move oa_config vma to active (Chris)
v3: Don't drop the lock for engine lookup (Chris)
Move OA config vma to active before writing the ringbuffer (Chris)
v4: Reuse i915_user_extension_fn
Serialize requests with OA config updates
v5: Check that the chained extension is only present once (Chris)
Unpin oa_vma in main path (Chris)
v6: Use BIT_ULL (Chris)
v7: Hold drm.struct_mutex when serializing the request with OA config (Chris)
v8: Remove active request from engine (Lionel)
v9: Move fetching OA configuration pass engine pinning (Lionel)
Lock VMA before moving to active (Chris)
v10: Fix leak on perf_fd (Lionel)
Signed-off-by: Lionel Landwerlin <lionel.g.landwer...@intel.com>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 147 +++++++++++++++++-
drivers/gpu/drm/i915/i915_getparam.c | 4 +
include/uapi/drm/i915_drm.h | 39 +++++
3 files changed, 188 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 46ad8d9642d1..d416b60c94bb 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -24,6 +24,7 @@
#include "i915_gem_clflush.h"
#include "i915_gem_context.h"
#include "i915_gem_ioctls.h"
+#include "i915_perf.h"
#include "i915_trace.h"
#include "i915_user_extensions.h"
@@ -284,7 +285,12 @@ struct i915_execbuffer {
struct {
u64 flags; /** Available extensions parameters */
struct drm_i915_gem_execbuffer_ext_timeline_fences
timeline_fences;
+ struct drm_i915_gem_execbuffer_ext_perf perf_config;
} extensions;
+
+ struct file *perf_file;
+ struct i915_oa_config *oa_config; /** HW configuration for OA, NULL is
not needed. */
+ struct i915_vma *oa_vma;
};
#define exec_entry(EB, VMA) (&(EB)->exec[(VMA)->exec_flags - (EB)->flags])
@@ -1152,6 +1158,58 @@ static int reloc_move_to_gpu(struct i915_request *rq,
struct i915_vma *vma)
return err;
}
+
+static int
+eb_get_oa_config(struct i915_execbuffer *eb)
+{
+ struct drm_i915_gem_object *oa_bo;
+ int err = 0;
+
+ eb->perf_file = NULL;
+ eb->oa_config = NULL;
+ eb->oa_vma = NULL;
+
+ if ((eb->extensions.flags & BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_PERF))
== 0)
+ return 0;
+
+ eb->perf_file = fget(eb->extensions.perf_config.perf_fd);
+ if (!eb->perf_file)
+ return -EINVAL;
+
+ err = i915_mutex_lock_interruptible(&eb->i915->drm);
+ if (err)
+ return err;
+
+ if (eb->perf_file->private_data != eb->i915->perf.exclusive_stream)
+ err = -EINVAL;
+
+ mutex_unlock(&eb->i915->drm.struct_mutex);
+
+ if (err)
+ return err;
+
+ if (eb->i915->perf.exclusive_stream->engine != eb->engine)
+ return -EINVAL;
+
+ err = i915_perf_get_oa_config_and_bo(
+ eb->i915->perf.exclusive_stream,
+ eb->extensions.perf_config.oa_config,
+ &eb->oa_config, &oa_bo);
+ if (err)
+ return err;
+
+ eb->oa_vma = i915_vma_instance(oa_bo,
+ &eb->engine->gt->ggtt->vm, NULL);
+ i915_gem_object_put(oa_bo);
+ if (IS_ERR(eb->oa_vma)) {
+ err = PTR_ERR(eb->oa_vma);
+ eb->oa_vma = NULL;
+ return err;
+ }
+
+ return 0;
+}
+
static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
struct i915_vma *vma,
unsigned int len)
@@ -2051,6 +2109,54 @@ add_to_client(struct i915_request *rq, struct drm_file
*file)
spin_unlock(&file_priv->mm.lock);
}
+static int eb_oa_config(struct i915_execbuffer *eb)
+{
+ struct i915_perf_stream *perf_stream;
+ int err;
+
+ if (!eb->oa_config)
+ return 0;
+
+ perf_stream = eb->perf_file->private_data;
+
+ err = mutex_lock_interruptible(&perf_stream->config_mutex);
+ if (err)
+ return err;
+
+ err = i915_active_request_set(&perf_stream->active_config_rq,
+ eb->request);
+ if (err)
+ goto out;
+
+ /*
+ * If the config hasn't changed, skip reconfiguring the HW (this is
+ * subject to a delay we want to avoid has much as possible).
+ */
+ if (eb->oa_config == perf_stream->oa_config)
+ goto out;
+
+ i915_vma_lock(eb->oa_vma);
+ err = i915_request_await_object(eb->request, eb->oa_vma->obj, false);
/* await_resv already! */
+ if (!err)
+ err = i915_vma_move_to_active(eb->oa_vma, eb->request, 0);
+ i915_vma_unlock(eb->oa_vma);
+ if (err)
+ goto out;
+
+ err = eb->engine->emit_bb_start(eb->request,
+ eb->oa_vma->node.start,
+ 0, I915_DISPATCH_SECURE);
+ if (err)
+ goto out;
+
+ swap(eb->oa_config, perf_stream->oa_config);
+
+out:
+ mutex_unlock(&perf_stream->config_mutex);
+
+ return err;
+}
+
static int eb_submit(struct i915_execbuffer *eb)
{
int err;
@@ -2077,6 +2183,10 @@ static int eb_submit(struct i915_execbuffer *eb)
return err;
}
+ err = eb_oa_config(eb);
+ if (err)
+ return err;
+
err = eb->engine->emit_bb_start(eb->request,
eb->batch->node.start +
eb->batch_start_offset,
@@ -2643,8 +2753,25 @@ static int parse_timeline_fences(struct
i915_user_extension __user *ext, void *d
return 0;
}
+static int parse_perf_config(struct i915_user_extension __user *ext, void
*data)
+{
+ struct i915_execbuffer *eb = data;
+
+ if (eb->extensions.flags & BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_PERF))
+ return -EINVAL;
+
+ if (copy_from_user(&eb->extensions.perf_config, ext,
+ sizeof(eb->extensions.perf_config)))
+ return -EFAULT;
+
+ eb->extensions.flags |= BIT_ULL(DRM_I915_GEM_EXECBUFFER_EXT_PERF);
+
+ return 0;
+}
+
static const i915_user_extension_fn execbuf_extensions[] = {
[DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES] = parse_timeline_fences,
+ [DRM_I915_GEM_EXECBUFFER_EXT_PERF] = parse_perf_config,
};
static int
@@ -2769,9 +2896,13 @@ i915_gem_do_execbuffer(struct drm_device *dev,
if (unlikely(err))
goto err_context;
+ err = eb_get_oa_config(&eb);
+ if (err)
+ goto err_oa_config;
+
err = i915_mutex_lock_interruptible(dev);
if (err)
- goto err_engine;
+ goto err_oa_config;
err = eb_relocate(&eb);
if (err) {
@@ -2889,6 +3020,12 @@ i915_gem_do_execbuffer(struct drm_device *dev,
}
}
+ if (eb.oa_vma) {
+ err = i915_vma_pin(eb.oa_vma, 0, 0, PIN_GLOBAL);
+ if (err)
+ goto err_request;
+ }
+
/*
* Whilst this request exists, batch_obj will be on the
* active_list, and so will hold the active reference. Only when this
@@ -2929,7 +3066,13 @@ i915_gem_do_execbuffer(struct drm_device *dev,
if (eb.exec)
eb_release_vmas(&eb);
mutex_unlock(&dev->struct_mutex);
-err_engine:
+err_oa_config:
+ if (eb.perf_file)
+ fput(eb.perf_file);
+ if (eb.oa_config)
+ i915_oa_config_put(eb.oa_config);
+ if (eb.oa_vma)
+ i915_vma_unpin(eb.oa_vma);
eb_unpin_engine(&eb);
err_context:
i915_gem_context_put(eb.gem_context);
diff --git a/drivers/gpu/drm/i915/i915_getparam.c
b/drivers/gpu/drm/i915/i915_getparam.c
index bd41cc5ce906..39d4c2c2e0f4 100644
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -161,6 +161,10 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
case I915_PARAM_PERF_REVISION:
value = i915_perf_ioctl_version();
break;
+ case I915_PARAM_HAS_EXEC_PERF_CONFIG:
+ /* Obviously requires perf support. */
+ value = i915->perf.initialized;
+ break;
default:
DRM_DEBUG("Unknown parameter %d\n", param->param);
return -EINVAL;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index e98c9a7baa91..3166c9ca85f3 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -624,6 +624,16 @@ typedef struct drm_i915_irq_wait {
*/
#define I915_PARAM_PERF_REVISION 55
+/*
+ * Request an i915/perf performance configuration change before running the
+ * commands given in an execbuf.
+ *
+ * Performance configuration ID and the file descriptor of the i915 perf
+ * stream are given through drm_i915_gem_execbuffer_ext_perf. See
+ * I915_EXEC_EXT.
+ */
+#define I915_PARAM_HAS_EXEC_PERF_CONFIG 56
+
/* Must be kept compact -- no holes and well documented */
typedef struct drm_i915_getparam {
@@ -1026,6 +1036,12 @@ enum drm_i915_gem_execbuffer_ext {
*/
DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES = 1,
+ /**
+ * This identifier is associated with
+ * drm_i915_gem_execbuffer_perf_ext.
+ */
+ DRM_I915_GEM_EXECBUFFER_EXT_PERF,
+
DRM_I915_GEM_EXECBUFFER_EXT_MAX /* non-ABI */
};
@@ -1056,6 +1072,29 @@ struct drm_i915_gem_execbuffer_ext_timeline_fences {
__u64 values_ptr;
};
+struct drm_i915_gem_execbuffer_ext_perf {
+ struct i915_user_extension base;
+
+ /**
+ * Performance file descriptor returned by DRM_IOCTL_I915_PERF_OPEN.
+ * This is used to identify that the application requesting a HW
+ * performance configuration change actually has a right to do so
+ * because it also has access the i915-perf stream.
+ */
+ __s32 perf_fd;
+
+ /**
+ * Unused for now. Must be cleared to zero.
+ */
+ __u32 pad;
+
+ /**
+ * OA configuration ID to switch to before executing the commands
+ * associated to the execbuf.
+ */
+ __u64 oa_config;
+};
+
struct drm_i915_gem_execbuffer2 {
/**
* List of gem_exec_object2 structs
--
2.23.0
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