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Subject[PATCH] Track total GPU memory for virtio driver
Date
On the success of virtio_gpu_object_create, add size of newly allocated
bo to the tracled total_mem. In drm_gem_object_funcs.free, after the gem
bo lost its last refcount, subtract the bo size from the tracked
total_mem if the original underlying memory allocation is successful.

Signed-off-by: Yiwei Zhang <zzyiwei@android.com>
---
drivers/gpu/drm/virtio/Kconfig | 1 +
drivers/gpu/drm/virtio/virtgpu_drv.h | 4 ++++
drivers/gpu/drm/virtio/virtgpu_object.c | 19 +++++++++++++++++++
3 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/virtio/Kconfig b/drivers/gpu/drm/virtio/Kconfig
index b925b8b1da16..e103b7e883b1 100644
--- a/drivers/gpu/drm/virtio/Kconfig
+++ b/drivers/gpu/drm/virtio/Kconfig
@@ -5,6 +5,7 @@ config DRM_VIRTIO_GPU
select DRM_KMS_HELPER
select DRM_GEM_SHMEM_HELPER
select VIRTIO_DMA_SHARED_BUFFER
+ select TRACE_GPU_MEM
help
This is the virtual GPU driver for virtio. It can be used with
QEMU based VMMs (like KVM or Xen).
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 6a232553c99b..7c60e7486bc4 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -249,6 +249,10 @@ struct virtio_gpu_device {
spinlock_t resource_export_lock;
/* protects map state and host_visible_mm */
spinlock_t host_visible_lock;
+
+#ifdef CONFIG_TRACE_GPU_MEM
+ atomic64_t total_mem;
+#endif
};

struct virtio_gpu_fpriv {
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index d69a5b6da553..1e16226cebbe 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -25,12 +25,29 @@

#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
+#ifdef CONFIG_TRACE_GPU_MEM
+#include <trace/events/gpu_mem.h>
+#endif

#include "virtgpu_drv.h"

static int virtio_gpu_virglrenderer_workaround = 1;
module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);

+#ifdef CONFIG_TRACE_GPU_MEM
+static inline void virtio_gpu_trace_total_mem(struct virtio_gpu_device *vgdev,
+ s64 delta)
+{
+ u64 total_mem = atomic64_add_return(delta, &vgdev->total_mem);
+
+ trace_gpu_mem_total(0, 0, total_mem);
+}
+#else
+static inline void virtio_gpu_trace_total_mem(struct virtio_gpu_device *, s64)
+{
+}
+#endif
+
int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
{
if (virtio_gpu_virglrenderer_workaround) {
@@ -104,6 +121,7 @@ static void virtio_gpu_free_object(struct drm_gem_object *obj)
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;

if (bo->created) {
+ virtio_gpu_trace_total_mem(vgdev, -(obj->size));
virtio_gpu_cmd_unref_resource(vgdev, bo);
virtio_gpu_notify(vgdev);
/* completion handler calls virtio_gpu_cleanup_object() */
@@ -265,6 +283,7 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
virtio_gpu_object_attach(vgdev, bo, ents, nents);
}

+ virtio_gpu_trace_total_mem(vgdev, shmem_obj->base.size);
*bo_ptr = bo;
return 0;

--
2.30.0.284.gd98b1dd5eaa7-goog
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