[PATCH 59/62] drm: Replace virtio IDRs with IDAs

Matthew Wilcox
2017-11-22T21:10:02Z

These IDRs were only being used to allocate unique numbers, not to look
up pointers, so they can use the more space-efficient IDA instead.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 6 ++----
drivers/gpu/drm/virtio/virtgpu_kms.c | 18 ++++--------------
drivers/gpu/drm/virtio/virtgpu_vq.c | 12 ++----------
3 files changed, 8 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index da2fb585fea4..6852e8bbc1b0 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -181,8 +181,7 @@ struct virtio_gpu_device {
struct kmem_cache *vbufs;
bool vqs_ready;

- struct idr resource_idr;
- spinlock_t resource_idr_lock;
+ struct ida resource_ida;

wait_queue_head_t resp_wq;
/* current display info */
@@ -191,8 +190,7 @@ struct virtio_gpu_device {

struct virtio_gpu_fence_driver fence_drv;

- struct idr ctx_id_idr;
- spinlock_t ctx_id_idr_lock;
+ struct ida ctx_id_ida;

bool has_virgl_3d;

diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 6400506a06b0..29c08b63d8d3 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -55,21 +55,13 @@ static void virtio_gpu_config_changed_work_func(struct work_struct *work)
static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid)
{
- int handle;
-
- idr_preload(GFP_KERNEL);
- spin_lock(&vgdev->ctx_id_idr_lock);
- handle = idr_alloc(&vgdev->ctx_id_idr, NULL, 1, 0, 0);
- spin_unlock(&vgdev->ctx_id_idr_lock);
- idr_preload_end();
+ int handle = ida_simple_get(&vgdev->ctx_id_ida, 1, 0, GFP_KERNEL);
*resid = handle;
}

static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
- spin_lock(&vgdev->ctx_id_idr_lock);
- idr_remove(&vgdev->ctx_id_idr, id);
- spin_unlock(&vgdev->ctx_id_idr_lock);
+ ida_simple_remove(&vgdev->ctx_id_ida, id);
}

static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
@@ -151,10 +143,8 @@ int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
vgdev->dev = dev->dev;

spin_lock_init(&vgdev->display_info_lock);
- spin_lock_init(&vgdev->ctx_id_idr_lock);
- idr_init(&vgdev->ctx_id_idr);
- spin_lock_init(&vgdev->resource_idr_lock);
- idr_init(&vgdev->resource_idr);
+ ida_init(&vgdev->ctx_id_ida);
+ ida_init(&vgdev->resource_ida);
init_waitqueue_head(&vgdev->resp_wq);
virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 9eb96fb2c147..b35b5f2c056c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -41,21 +41,13 @@
void virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid)
{
- int handle;
-
- idr_preload(GFP_KERNEL);
- spin_lock(&vgdev->resource_idr_lock);
- handle = idr_alloc(&vgdev->resource_idr, NULL, 1, 0, GFP_NOWAIT);
- spin_unlock(&vgdev->resource_idr_lock);
- idr_preload_end();
+ int handle = ida_simple_get(&vgdev->resource_ida, 1, 0, GFP_KERNEL);
*resid = handle;
}

void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
- spin_lock(&vgdev->resource_idr_lock);
- idr_remove(&vgdev->resource_idr, id);
- spin_unlock(&vgdev->resource_idr_lock);
+ ida_simple_remove(&vgdev->resource_ida, id);
}

void virtio_gpu_ctrl_ack(struct virtqueue *vq)
--
2.15.0