[PATCH] drm/i915/gvt: Introduce vGPU mm notifier
Zhenyu Wang
zhenyuw at linux.intel.com
Mon Apr 24 02:50:10 UTC 2017
On 2017.04.21 23:32:28 +0800, Zhi Wang wrote:
> This patch introduces vGPU mm notifier for clients who may wish to track
> guest changing its graphics memory mapping in a vGPU GGTT/PPGTT mm.
>
> Signed-off-by: Zhi Wang <zhi.a.wang at intel.com>
> ---
We might wait to merge this until real user will be ready.
> +
> +/**
> + * intel_vgpu_activate_mm_notifier - activate a vGPU mm notifier
> + * @n: a vGPU mm notifier
> + *
> + * This function is used to start tracking the GMADR mapping change.
> + *
> + * Returns:
> + * Zero on success, negative error code in pointer if failed.
> + */
> +int intel_vgpu_activate_mm_notifier(struct intel_vgpu_mm_notifier *n)
> +{
> + if (n->active)
> + return -EEXIST;
> +
> + n->active = true;
> + interval_tree_insert(&n->node, &n->mm->mm_notifiers);
> +
> + return 0;
> +}
I think you should add start/last setting here for this notifier
instead of leaving out to caller, which will be consistent then.
> +
> +/**
> + * intel_vgpu_deactivate_mm_notifier - de-activate a vGPU mm notifier
> + * @n: a vGPU mm notifier
> + *
> + * This function is used to stop tracking the GMADR mapping change. If a
> + * client wish to modify the tracking range, it has to stop the tracking
> + * first and then start the tracking again after modifying the range.
> + *
> + */
> +void intel_vgpu_deactivate_notifier(struct intel_vgpu_mm_notifier *n)
> +{
> + interval_tree_remove(&n->node, &n->mm->mm_notifiers);
> + n->active = false;
> +}
> diff --git a/drivers/gpu/drm/i915/gvt/gtt.h b/drivers/gpu/drm/i915/gvt/gtt.h
> index f88eb5e..95cfe7b 100644
> --- a/drivers/gpu/drm/i915/gvt/gtt.h
> +++ b/drivers/gpu/drm/i915/gvt/gtt.h
> @@ -121,6 +121,18 @@ typedef enum {
> GTT_TYPE_MAX,
> } intel_gvt_gtt_type_t;
>
> +struct intel_vgpu_mm_notifier {
> + bool active;
> +
> + struct intel_vgpu_mm *mm;
> + int (*mapping_change)(struct intel_vgpu_mm_notifier *, u64, u64);
> + struct interval_tree_node node;
> +};
> +
> +extern int intel_vgpu_activate_mm_notifier(struct intel_vgpu_mm_notifier *n);
> +
> +extern void intel_vgpu_deactivate_mm_notifier(struct intel_vgpu_mm_notifier *n);
> +
> struct intel_vgpu_mm {
> int type;
> bool initialized;
> @@ -141,6 +153,7 @@ struct intel_vgpu_mm {
> atomic_t pincount;
> struct list_head lru_list;
> struct intel_vgpu *vgpu;
> + struct rb_root mm_notifiers;
> };
You also need to handle notifier tree cleanup when vgpu mm destroy.
>
> extern struct intel_gvt_gtt_entry *intel_vgpu_mm_get_entry(
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index becae2f..b3629404 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -33,6 +33,8 @@
> #ifndef _GVT_H_
> #define _GVT_H_
>
> +#include <linux/interval_tree.h>
> +
> #include "debug.h"
> #include "hypercall.h"
> #include "mmio.h"
> --
> 2.7.4
>
> _______________________________________________
> intel-gvt-dev mailing list
> intel-gvt-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev
--
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