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dma-mapping fixes for Linux 6.10

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- dma-mapping benchmark error handling fixes (Fedor Pchelkin)
  - correct a config symbol reference in the DMA API documentation
    (Lukas Bulwahn)
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Merge tag 'dma-mapping-6.10-2024-05-31' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:

 - dma-mapping benchmark error handling fixes (Fedor Pchelkin)

 - correct a config symbol reference in the DMA API documentation (Lukas
   Bulwahn)

* tag 'dma-mapping-6.10-2024-05-31' of git://git.infradead.org/users/hch/dma-mapping:
  Documentation/core-api: correct reference to SWIOTLB_DYNAMIC
  dma-mapping: benchmark: handle NUMA_NO_NODE correctly
  dma-mapping: benchmark: fix node id validation
  dma-mapping: benchmark: avoid needless copy_to_user if benchmark fails
  dma-mapping: benchmark: fix up kthread-related error handling
This commit is contained in:
Linus Torvalds 2024-05-31 12:14:55 -07:00
commit b050496579
2 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/core-api/swiotlb.rst
View File

@ -192,7 +192,7 @@ alignment larger than PAGE_SIZE.
Dynamic swiotlb
---------------
When CONFIG_DYNAMIC_SWIOTLB is enabled, swiotlb can do on-demand expansion of
When CONFIG_SWIOTLB_DYNAMIC is enabled, swiotlb can do on-demand expansion of
the amount of memory available for allocation as bounce buffers. If a bounce
buffer request fails due to lack of available space, an asynchronous background
task is kicked off to allocate memory from general system memory and turn it

25
kernel/dma/map_benchmark.c
View File

@ -101,7 +101,6 @@ static int do_map_benchmark(struct map_benchmark_data *map)
struct task_struct **tsk;
int threads = map->bparam.threads;
int node = map->bparam.node;
const cpumask_t *cpu_mask = cpumask_of_node(node);
u64 loops;
int ret = 0;
int i;
@ -118,11 +117,13 @@ static int do_map_benchmark(struct map_benchmark_data *map)
if (IS_ERR(tsk[i])) {
pr_err("create dma_map thread failed\n");
ret = PTR_ERR(tsk[i]);
while (--i >= 0)
kthread_stop(tsk[i]);
goto out;
}
if (node != NUMA_NO_NODE)
kthread_bind_mask(tsk[i], cpu_mask);
kthread_bind_mask(tsk[i], cpumask_of_node(node));
}
/* clear the old value in the previous benchmark */
@ -139,13 +140,17 @@ static int do_map_benchmark(struct map_benchmark_data *map)
msleep_interruptible(map->bparam.seconds * 1000);
/* wait for the completion of benchmark threads */
/* wait for the completion of all started benchmark threads */
for (i = 0; i < threads; i++) {
ret = kthread_stop(tsk[i]);
if (ret)
goto out;
int kthread_ret = kthread_stop_put(tsk[i]);
if (kthread_ret)
ret = kthread_ret;
}
if (ret)
goto out;
loops = atomic64_read(&map->loops);
if (likely(loops > 0)) {
u64 map_variance, unmap_variance;
@ -170,8 +175,6 @@ static int do_map_benchmark(struct map_benchmark_data *map)
}
out:
for (i = 0; i < threads; i++)
put_task_struct(tsk[i]);
put_device(map->dev);
kfree(tsk);
return ret;
@ -208,7 +211,8 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
}
if (map->bparam.node != NUMA_NO_NODE &&
!node_possible(map->bparam.node)) {
(map->bparam.node < 0 || map->bparam.node >= MAX_NUMNODES ||
!node_possible(map->bparam.node))) {
pr_err("invalid numa node\n");
return -EINVAL;
}
@ -252,6 +256,9 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
* dma_mask changed by benchmark
*/
dma_set_mask(map->dev, old_dma_mask);
if (ret)
return ret;
break;
default:
return -EINVAL;