All DMA heaps now register a new GPU cgroup bucket upon creation, and the system_heap now exports buffers associated with its GPU cgroup bucket for tracking purposes.
In order to support GPU cgroup charge transfer on a dma-buf, the current GPU cgroup information must be stored inside the dma-buf struct. For tracked buffers, exporters include the struct gpucg and struct gpucg_bucket pointers in the export info which can later be modified if the charge is migrated to another cgroup.
Signed-off-by: Hridya Valsaraju hridya@google.com Signed-off-by: T.J. Mercier tjmercier@google.com
--- v5 changes Merge dmabuf: Use the GPU cgroup charge/uncharge APIs into this patch.
Remove all GPU cgroup code from dma-buf except what's necessary to support charge transfer. Previously charging was done in export, but for non-Android graphics use-cases this is not ideal since there may be a dealy between allocation and export, during which time there is no accounting.
Append "-heap" to gpucg_bucket names.
Charge on allocation instead of export. This should more closely mirror non-Android use-cases where there is potentially a delay between allocation and export.
Put the charge and uncharge code in the same file (system_heap_allocate, system_heap_dma_buf_release) instead of splitting them between the heap and the dma_buf_release.
Move no-op code to header file to match other files in the series.
v3 changes Use more common dual author commit message format per John Stultz.
v2 changes Move dma-buf cgroup charge transfer from a dma_buf_op defined by every heap to a single dma-buf function for all heaps per Daniel Vetter and Christian König. --- drivers/dma-buf/dma-buf.c | 19 +++++++++++++ drivers/dma-buf/dma-heap.c | 39 +++++++++++++++++++++++++++ drivers/dma-buf/heaps/system_heap.c | 28 +++++++++++++++++--- include/linux/dma-buf.h | 41 +++++++++++++++++++++++------ include/linux/dma-heap.h | 15 +++++++++++ 5 files changed, 130 insertions(+), 12 deletions(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index df23239b04fc..bc89c44bd9b9 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -462,6 +462,24 @@ static struct file *dma_buf_getfile(struct dma_buf *dmabuf, int flags) * &dma_buf_ops. */
+#ifdef CONFIG_CGROUP_GPU +static void dma_buf_set_gpucg(struct dma_buf *dmabuf, const struct dma_buf_export_info *exp) +{ + dmabuf->gpucg = exp->gpucg; + dmabuf->gpucg_bucket = exp->gpucg_bucket; +} + +void dma_buf_exp_info_set_gpucg(struct dma_buf_export_info *exp_info, + struct gpucg *gpucg, + struct gpucg_bucket *gpucg_bucket) +{ + exp_info->gpucg = gpucg; + exp_info->gpucg_bucket = gpucg_bucket; +} +#else +static void dma_buf_set_gpucg(struct dma_buf *dmabuf, struct dma_buf_export_info *exp) {} +#endif + /** * dma_buf_export - Creates a new dma_buf, and associates an anon file * with this buffer, so it can be exported. @@ -527,6 +545,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) init_waitqueue_head(&dmabuf->poll); dmabuf->cb_in.poll = dmabuf->cb_out.poll = &dmabuf->poll; dmabuf->cb_in.active = dmabuf->cb_out.active = 0; + dma_buf_set_gpucg(dmabuf, exp_info);
if (!resv) { resv = (struct dma_resv *)&dmabuf[1]; diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index 8f5848aa144f..b81015548314 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -7,10 +7,12 @@ */
#include <linux/cdev.h> +#include <linux/cgroup_gpu.h> #include <linux/debugfs.h> #include <linux/device.h> #include <linux/dma-buf.h> #include <linux/err.h> +#include <linux/kconfig.h> #include <linux/xarray.h> #include <linux/list.h> #include <linux/slab.h> @@ -21,6 +23,7 @@ #include <uapi/linux/dma-heap.h>
#define DEVNAME "dma_heap" +#define HEAP_NAME_SUFFIX "-heap"
#define NUM_HEAP_MINORS 128
@@ -31,6 +34,7 @@ * @heap_devt heap device node * @list list head connecting to list of heaps * @heap_cdev heap char device + * @gpucg_bucket gpu cgroup bucket for memory accounting * * Represents a heap of memory from which buffers can be made. */ @@ -41,6 +45,9 @@ struct dma_heap { dev_t heap_devt; struct list_head list; struct cdev heap_cdev; +#ifdef CONFIG_CGROUP_GPU + struct gpucg_bucket gpucg_bucket; +#endif };
static LIST_HEAD(heap_list); @@ -216,6 +223,19 @@ const char *dma_heap_get_name(struct dma_heap *heap) return heap->name; }
+/** + * dma_heap_get_gpucg_bucket() - get struct gpucg_bucket for the heap. + * @heap: DMA-Heap to get the gpucg_bucket struct for. + * + * Returns: + * The gpucg_bucket struct for the heap. NULL if the GPU cgroup controller is + * not enabled. + */ +struct gpucg_bucket *dma_heap_get_gpucg_bucket(struct dma_heap *heap) +{ + return &heap->gpucg_bucket; +} + struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) { struct dma_heap *heap, *h, *err_ret; @@ -228,6 +248,12 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) return ERR_PTR(-EINVAL); }
+ if (IS_ENABLED(CONFIG_CGROUP_GPU) && strlen(exp_info->name) + strlen(HEAP_NAME_SUFFIX) >= + GPUCG_BUCKET_NAME_MAX_LEN) { + pr_err("dma_heap: Name is too long for GPU cgroup\n"); + return ERR_PTR(-ENAMETOOLONG); + } + if (!exp_info->ops || !exp_info->ops->allocate) { pr_err("dma_heap: Cannot add heap with invalid ops struct\n"); return ERR_PTR(-EINVAL); @@ -253,6 +279,19 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) heap->ops = exp_info->ops; heap->priv = exp_info->priv;
+ if (IS_ENABLED(CONFIG_CGROUP_GPU)) { + char gpucg_bucket_name[GPUCG_BUCKET_NAME_MAX_LEN]; + + snprintf(gpucg_bucket_name, sizeof(gpucg_bucket_name), "%s%s", + exp_info->name, HEAP_NAME_SUFFIX); + + ret = gpucg_register_bucket(dma_heap_get_gpucg_bucket(heap), gpucg_bucket_name); + if (ret < 0) { + err_ret = ERR_PTR(ret); + goto err0; + } + } + /* Find unused minor number */ ret = xa_alloc(&dma_heap_minors, &minor, heap, XA_LIMIT(0, NUM_HEAP_MINORS - 1), GFP_KERNEL); diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index fcf836ba9c1f..27f686faef00 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -297,6 +297,11 @@ static void system_heap_dma_buf_release(struct dma_buf *dmabuf) } sg_free_table(table); kfree(buffer); + + if (dmabuf->gpucg && dmabuf->gpucg_bucket) { + gpucg_uncharge(dmabuf->gpucg, dmabuf->gpucg_bucket, dmabuf->size); + gpucg_put(dmabuf->gpucg); + } }
static const struct dma_buf_ops system_heap_buf_ops = { @@ -346,11 +351,21 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap, struct scatterlist *sg; struct list_head pages; struct page *page, *tmp_page; - int i, ret = -ENOMEM; + struct gpucg *gpucg; + struct gpucg_bucket *gpucg_bucket; + int i, ret; + + gpucg = gpucg_get(current); + gpucg_bucket = dma_heap_get_gpucg_bucket(heap); + ret = gpucg_charge(gpucg, gpucg_bucket, len); + if (ret) + goto put_gpucg;
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); - if (!buffer) - return ERR_PTR(-ENOMEM); + if (!buffer) { + ret = -ENOMEM; + goto uncharge_gpucg; + }
INIT_LIST_HEAD(&buffer->attachments); mutex_init(&buffer->lock); @@ -396,6 +411,8 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap, exp_info.size = buffer->len; exp_info.flags = fd_flags; exp_info.priv = buffer; + dma_buf_exp_info_set_gpucg(&exp_info, gpucg, gpucg_bucket); + dmabuf = dma_buf_export(&exp_info); if (IS_ERR(dmabuf)) { ret = PTR_ERR(dmabuf); @@ -414,7 +431,10 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap, list_for_each_entry_safe(page, tmp_page, &pages, lru) __free_pages(page, compound_order(page)); kfree(buffer); - +uncharge_gpucg: + gpucg_uncharge(gpucg, gpucg_bucket, len); +put_gpucg: + gpucg_put(gpucg); return ERR_PTR(ret); }
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 2097760e8e95..8e7c55c830b3 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -13,6 +13,7 @@ #ifndef __DMA_BUF_H__ #define __DMA_BUF_H__
+#include <linux/cgroup_gpu.h> #include <linux/iosys-map.h> #include <linux/file.h> #include <linux/err.h> @@ -303,7 +304,7 @@ struct dma_buf { /** * @size: * - * Size of the buffer; invariant over the lifetime of the buffer. + * Size of the buffer in bytes; invariant over the lifetime of the buffer. */ size_t size;
@@ -453,6 +454,14 @@ struct dma_buf { struct dma_buf *dmabuf; } *sysfs_entry; #endif + +#ifdef CONFIG_CGROUP_GPU + /** @gpucg: Pointer to the GPU cgroup this buffer currently belongs to. */ + struct gpucg *gpucg; + + /* @gpucg_bucket: Pointer to the GPU cgroup bucket whence this buffer originates. */ + struct gpucg_bucket *gpucg_bucket; +#endif };
/** @@ -526,13 +535,15 @@ struct dma_buf_attachment {
/** * struct dma_buf_export_info - holds information needed to export a dma_buf - * @exp_name: name of the exporter - useful for debugging. - * @owner: pointer to exporter module - used for refcounting kernel module - * @ops: Attach allocator-defined dma buf ops to the new buffer - * @size: Size of the buffer - invariant over the lifetime of the buffer - * @flags: mode flags for the file - * @resv: reservation-object, NULL to allocate default one - * @priv: Attach private data of allocator to this buffer + * @exp_name: name of the exporter - useful for debugging. + * @owner: pointer to exporter module - used for refcounting kernel module + * @ops: Attach allocator-defined dma buf ops to the new buffer + * @size: Size of the buffer in bytes - invariant over the lifetime of the buffer + * @flags: mode flags for the file + * @resv: reservation-object, NULL to allocate default one + * @priv: Attach private data of allocator to this buffer + * @gpucg: Pointer to GPU cgroup this buffer is charged to, or NULL if not charged + * @gpucg_bucket: Pointer to GPU cgroup bucket this buffer comes from, or NULL if not charged * * This structure holds the information required to export the buffer. Used * with dma_buf_export() only. @@ -545,6 +556,10 @@ struct dma_buf_export_info { int flags; struct dma_resv *resv; void *priv; +#ifdef CONFIG_CGROUP_GPU + struct gpucg *gpucg; + struct gpucg_bucket *gpucg_bucket; +#endif };
/** @@ -630,4 +645,14 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, unsigned long); int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map); void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map); + +#ifdef CONFIG_CGROUP_GPU +void dma_buf_exp_info_set_gpucg(struct dma_buf_export_info *exp_info, + struct gpucg *gpucg, + struct gpucg_bucket *gpucg_bucket); +#else/* CONFIG_CGROUP_GPU */ +static inline void dma_buf_exp_info_set_gpucg(struct dma_buf_export_info *exp_info, + struct gpucg *gpucg, + struct gpucg_bucket *gpucg_bucket) {} +#endif /* CONFIG_CGROUP_GPU */ #endif /* __DMA_BUF_H__ */ diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h index 0c05561cad6e..6321e7636538 100644 --- a/include/linux/dma-heap.h +++ b/include/linux/dma-heap.h @@ -10,6 +10,7 @@ #define _DMA_HEAPS_H
#include <linux/cdev.h> +#include <linux/cgroup_gpu.h> #include <linux/types.h>
struct dma_heap; @@ -59,6 +60,20 @@ void *dma_heap_get_drvdata(struct dma_heap *heap); */ const char *dma_heap_get_name(struct dma_heap *heap);
+#ifdef CONFIG_CGROUP_GPU +/** + * dma_heap_get_gpucg_bucket() - get a pointer to the struct gpucg_bucket for the heap. + * @heap: DMA-Heap to retrieve gpucg_bucket for + * + * Returns: + * The gpucg_bucket struct for the heap. + */ +struct gpucg_bucket *dma_heap_get_gpucg_bucket(struct dma_heap *heap); +#else /* CONFIG_CGROUP_GPU */ +static inline struct gpucg_bucket *dma_heap_get_gpucg_bucket(struct dma_heap *heap) +{ return NULL; } +#endif /* CONFIG_CGROUP_GPU */ + /** * dma_heap_add - adds a heap to dmabuf heaps * @exp_info: information needed to register this heap