On 4/17/21 1:54 PM, Christian König wrote:
> Am 17.04.21 um 13:20 schrieb [email protected]:
>> On 4/17/21 12:59 PM, Christian König wrote:
>>> Am 17.04.21 um 12:40 schrieb Peter Enderborg:
>>>> This adds a total used dma-buf memory. Details
>>>> can be found in debugfs, however it is not for everyone
>>>> and not always available. dma-buf are indirect allocated by
>>>> userspace. So with this value we can monitor and detect
>>>> userspace applications that have problems.
>>>>
>>>> Signed-off-by: Peter Enderborg <[email protected]>
>>> Reviewed-by: Christian König <[email protected]>
>>>
>>> How do you want to upstream this?
>> I don't understand that question. The patch applies on Torvalds 5.12-rc7,
>> but I guess 5.13 is what we work on right now.
>
> Yeah, but how do you want to get it into Linus tree?
>
> I can push it together with other DMA-buf patches through drm-misc-next and
> then Dave will send it to Linus for inclusion in 5.13.
>
> But could be that you are pushing multiple changes towards Linus through some
> other branch. In this case I'm fine if you pick that way instead if you want
> to keep your patches together for some reason.
>
It is a dma-buf functionality so it make very much sense that you as maintainer
of dma-buf pick them the way you usually send them. I don't have any other path
for this patch.
Thx!
Peter.
> Christian.
>
>>
>>>> ---
>>>> drivers/dma-buf/dma-buf.c | 13 +++++++++++++
>>>> fs/proc/meminfo.c | 5 ++++-
>>>> include/linux/dma-buf.h | 1 +
>>>> 3 files changed, 18 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
>>>> index f264b70c383e..197e5c45dd26 100644
>>>> --- a/drivers/dma-buf/dma-buf.c
>>>> +++ b/drivers/dma-buf/dma-buf.c
>>>> @@ -37,6 +37,7 @@ struct dma_buf_list {
>>>> };
>>>> static struct dma_buf_list db_list;
>>>> +static atomic_long_t dma_buf_global_allocated;
>>>> static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int
>>>> buflen)
>>>> {
>>>> @@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry)
>>>> if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
>>>> dma_resv_fini(dmabuf->resv);
>>>> + atomic_long_sub(dmabuf->size, &dma_buf_global_allocated);
>>>> module_put(dmabuf->owner);
>>>> kfree(dmabuf->name);
>>>> kfree(dmabuf);
>>>> @@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct
>>>> dma_buf_export_info *exp_info)
>>>> mutex_lock(&db_list.lock);
>>>> list_add(&dmabuf->list_node, &db_list.head);
>>>> mutex_unlock(&db_list.lock);
>>>> + atomic_long_add(dmabuf->size, &dma_buf_global_allocated);
>>>> return dmabuf;
>>>> @@ -1346,6 +1349,16 @@ void dma_buf_vunmap(struct dma_buf *dmabuf,
>>>> struct dma_buf_map *map)
>>>> }
>>>> EXPORT_SYMBOL_GPL(dma_buf_vunmap);
>>>> +/**
>>>> + * dma_buf_allocated_pages - Return the used nr of pages
>>>> + * allocated for dma-buf
>>>> + */
>>>> +long dma_buf_allocated_pages(void)
>>>> +{
>>>> + return atomic_long_read(&dma_buf_global_allocated) >> PAGE_SHIFT;
>>>> +}
>>>> +EXPORT_SYMBOL_GPL(dma_buf_allocated_pages);
>>>> +
>>>> #ifdef CONFIG_DEBUG_FS
>>>> static int dma_buf_debug_show(struct seq_file *s, void *unused)
>>>> {
>>>> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
>>>> index 6fa761c9cc78..ccc7c40c8db7 100644
>>>> --- a/fs/proc/meminfo.c
>>>> +++ b/fs/proc/meminfo.c
>>>> @@ -16,6 +16,7 @@
>>>> #ifdef CONFIG_CMA
>>>> #include <linux/cma.h>
>>>> #endif
>>>> +#include <linux/dma-buf.h>
>>>> #include <asm/page.h>
>>>> #include "internal.h"
>>>> @@ -145,7 +146,9 @@ static int meminfo_proc_show(struct seq_file *m,
>>>> void *v)
>>>> show_val_kb(m, "CmaFree: ",
>>>> global_zone_page_state(NR_FREE_CMA_PAGES));
>>>> #endif
>>>> -
>>>> +#ifdef CONFIG_DMA_SHARED_BUFFER
>>>> + show_val_kb(m, "DmaBufTotal: ", dma_buf_allocated_pages());
>>>> +#endif
>>>> hugetlb_report_meminfo(m);
>>>> arch_report_meminfo(m);
>>>> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
>>>> index efdc56b9d95f..5b05816bd2cd 100644
>>>> --- a/include/linux/dma-buf.h
>>>> +++ b/include/linux/dma-buf.h
>>>> @@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct
>>>> vm_area_struct *,
>>>> unsigned long);
>>>> int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
>>>> void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
>>>> +long dma_buf_allocated_pages(void);
>>>> #endif /* __DMA_BUF_H__ */
>
