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ANDROID: dma-buf: Make DMA-BUF sysfs stats kobjects not send uevents

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DMA-BUF per-buffer attachment stats are present at
/sys/kernel/dma-buf/buffers/<ino>/attachments. Since a kset of name
'attachment' is created everytime a buffer is allocated, disable
uevents from the kset to avoid their userspace overhead.

The ksets 'dma-buf' and 'buffers' do not need uevents disabled since
they are emitted just once but the patch does it for uniformity.

Bug: 186155231
Change-Id: I29009dd2aa0bc018c18bca7a1e0a068f4480cf13
Signed-off-by: Hridya Valsaraju <hridya@google.com>
This commit is contained in:
Hridya Valsaraju 2021-04-22 21:50:20 -07:00
commit 32124e310c
1 changed files with 19 additions and 3 deletions
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22
drivers/dma-buf/dma-buf-sysfs-stats.c
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@ -221,15 +221,30 @@ void dma_buf_stats_teardown(struct dma_buf *dmabuf)
kobject_put(&sysfs_entry->kobj);
}
/*
* Statistics files do not need to send uevents.
*/
static int dmabuf_sysfs_uevent_filter(struct kset *kset, struct kobject *kobj)
{
return 0;
}
static const struct kset_uevent_ops dmabuf_sysfs_no_uevent_ops = {
.filter = dmabuf_sysfs_uevent_filter,
};
static struct kset *dma_buf_stats_kset;
static struct kset *dma_buf_per_buffer_stats_kset;
int dma_buf_init_sysfs_statistics(void)
{
dma_buf_stats_kset = kset_create_and_add("dmabuf", NULL, kernel_kobj);
dma_buf_stats_kset = kset_create_and_add("dmabuf",
&dmabuf_sysfs_no_uevent_ops,
kernel_kobj);
if (!dma_buf_stats_kset)
return -ENOMEM;
dma_buf_per_buffer_stats_kset = kset_create_and_add("buffers", NULL,
dma_buf_per_buffer_stats_kset = kset_create_and_add("buffers",
&dmabuf_sysfs_no_uevent_ops,
&dma_buf_stats_kset->kobj);
if (!dma_buf_per_buffer_stats_kset) {
kset_unregister(dma_buf_stats_kset);
@ -275,7 +290,8 @@ int dma_buf_stats_setup(struct dma_buf *dmabuf)
goto err_sysfs_dmabuf;
/* create the directory for attachment stats */
attach_stats_kset = kset_create_and_add("attachments", NULL,
attach_stats_kset = kset_create_and_add("attachments",
&dmabuf_sysfs_no_uevent_ops,
&sysfs_entry->kobj);
if (!attach_stats_kset) {
ret = -ENOMEM;