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Commit 6846dfeb authored by Changbin Du's avatar Changbin Du Committed by Zhenyu Wang
Browse files

drm/i915/kvmgt: Add kvmgt debugfs entry nr_cache_entries under vgpu 



Add a new debugfs entry kvmgt_nr_cache_entries under vgpu which shows
the number of entry in dma cache.

$ cat /sys/kernel/debug/gvt/vgpu1/kvmgt_nr_cache_entries
10101

v3: fix compiling error for some configuration. (Xiong Zhang <xiong.y.zhang@intel.com>)
v2: keep debugfs layout flat.

Signed-off-by: default avatarChangbin Du <changbin.du@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent cf4ee73f

drivers/gpu/drm/i915/gvt/gvt.h

+1 −0
Original line number Diff line number Diff line
@@ -208,6 +208,7 @@ struct intel_vgpu { 
		 */

		struct rb_root gfn_cache;

		struct rb_root dma_addr_cache;

		unsigned long nr_cache_entries;

		struct mutex cache_lock;



		struct notifier_block iommu_notifier;

drivers/gpu/drm/i915/gvt/kvmgt.c

+15 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ 
#include <linux/kvm_host.h>

#include <linux/vfio.h>

#include <linux/mdev.h>

#include <linux/debugfs.h>



#include "i915_drv.h"

#include "gvt.h"
@@ -84,6 +85,7 @@ struct kvmgt_guest_info { 
#define NR_BKT (1 << 18)

	struct hlist_head ptable[NR_BKT];

#undef NR_BKT

	struct dentry *debugfs_cache_entries;

};



struct gvt_dma {
@@ -225,6 +227,8 @@ static void __gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn, 
	}

	rb_link_node(&new->dma_addr_node, parent, link);

	rb_insert_color(&new->dma_addr_node, &vgpu->vdev.dma_addr_cache);



	vgpu->vdev.nr_cache_entries++;

}



static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
@@ -233,6 +237,7 @@ static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu, 
	rb_erase(&entry->gfn_node, &vgpu->vdev.gfn_cache);

	rb_erase(&entry->dma_addr_node, &vgpu->vdev.dma_addr_cache);

	kfree(entry);

	vgpu->vdev.nr_cache_entries--;

}



static void gvt_cache_destroy(struct intel_vgpu *vgpu)
@@ -258,6 +263,7 @@ static void gvt_cache_init(struct intel_vgpu *vgpu) 
{

	vgpu->vdev.gfn_cache = RB_ROOT;

	vgpu->vdev.dma_addr_cache = RB_ROOT;

	vgpu->vdev.nr_cache_entries = 0;

	mutex_init(&vgpu->vdev.cache_lock);

}
@@ -1493,11 +1499,20 @@ static int kvmgt_guest_init(struct mdev_device *mdev) 
	info->track_node.track_flush_slot = kvmgt_page_track_flush_slot;

	kvm_page_track_register_notifier(kvm, &info->track_node);



	info->debugfs_cache_entries = debugfs_create_ulong(

						"kvmgt_nr_cache_entries",

						0444, vgpu->debugfs,

						&vgpu->vdev.nr_cache_entries);

	if (!info->debugfs_cache_entries)

		gvt_vgpu_err("Cannot create kvmgt debugfs entry\n");



	return 0;

}



static bool kvmgt_guest_exit(struct kvmgt_guest_info *info)

{

	debugfs_remove(info->debugfs_cache_entries);



	kvm_page_track_unregister_notifier(info->kvm, &info->track_node);

	kvm_put_kvm(info->kvm);

	kvmgt_protect_table_destroy(info);