Am 16.04.21 um 11:37 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.

Well you are kind of missing the intention here.

I mean knowing this is certainly useful in some case, but you need to describe which cases that are.

Christian.

Signed-off-by: Peter Enderborg peter.enderborg@sony.com

drivers/dma-buf/dma-buf.c | 12 ++++++++++++ fs/proc/meminfo.c | 2 ++ include/linux/dma-buf.h | 1 + 3 files changed, 15 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index f264b70c383e..9f88171b394c 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_size; 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_size); 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_size);

return dmabuf; @@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) } EXPORT_SYMBOL_GPL(dma_buf_vunmap); +/**

• • dma_buf_get_size - Return the used nr pages by dma-buf
• */

+long dma_buf_get_size(void) +{

• return atomic_long_read(&dma_buf_size) >> PAGE_SHIFT;

+} +EXPORT_SYMBOL_GPL(dma_buf_get_size);

• #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..3c1a82b51a6f 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" @@ -145,6 +146,7 @@ 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

• show_val_kb(m, "DmaBufTotal: ", dma_buf_get_size());

hugetlb_report_meminfo(m); diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index efdc56b9d95f..f6481315a377 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_get_size(void); #endif /* __DMA_BUF_H__ */