dma-buf: dump each dmabuf info

Loop into each dmabuf and dump its info, including name, exp_name, size and physical address range from the scatterlist table(sgt). Since the sgt of dmabuf only exist after device attach/map, but some dmabufs have not be attach/map by device yet. This patch creates a fake platform device to do attach/map for a dmabuf who has a empty attachment list, and unmap/detach after all. Tested on RV1106 evb: cat /proc/rk_dmabuf NAME EXPORT SIZE:KiB SGLIST vmpi rk-dma-heap-cma 4 KiB 0: 0x04548000..0x04548fff vmpi rk-dma-heap-cma 4 KiB 0: 0x04547000..0x04547fff vmpi rk-dma-heap-cma 5584 KiB 0: 0x05400000..0x05973fff vmpi rk-dma-heap-cma 920 KiB 0: 0x05300000..0x053e5fff vmpi rk-dma-heap-cma 232 KiB 0: 0x045c0000..0x045f9fff vmpi rk-dma-heap-cma 4 KiB 0: 0x04546000..0x04546fff vmpi rk-dma-heap-cma 5584 KiB 0: 0x04d00000..0x05273fff vmpi rk-dma-heap-cma 920 KiB 0: 0x04c00000..0x04ce5fff vmpi rk-dma-heap-cma 232 KiB 0: 0x04580000..0x045b9fff vmpi rk-dma-heap-cma 5400 KiB 0: 0x04600000..0x04b45fff vmpi rk-dma-heap-cma 5400 KiB 0: 0x04000000..0x04545fff (null) videobuf2_vmalloc 12 KiB (null) videobuf2_vmalloc 12 KiB (null) videobuf2_vmalloc 12 KiB (null) videobuf2_vmalloc 12 KiB Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com> Change-Id: Icf46e9d585847ef6dafbddcd24e589046e3ff015
2021-12-27 14:53:33 +08:00
parent 71d3656eaa
commit dde8daabfc
3 changed files with 109 additions and 0 deletions
@@ -9,6 +9,17 @@ config DMABUF_CACHE
 	  This option support to store attachments in a list and destroy them by
 	  set to a callback list in the dtor of dma-buf.

+config DMABUF_PROCFS
+	tristate "DMABUF procfs support"
+	depends on DMA_SHARED_BUFFER
+	depends on PROC_FS
+	depends on NO_GKI
+	help
+	  Turns on this to create a procfs debug interface for dma-buf, support
+	  get information from db_list by get_each_dmabuf.
+
+	  If unsure, say "N".
+
 config SYNC_FILE
 	bool "Explicit Synchronization Framework"
 	default n
@@ -10,6 +10,7 @@ obj-$(CONFIG_SW_SYNC_DEBUG)	+= sync_debug.o
 obj-$(CONFIG_UDMABUF)		+= udmabuf.o
 obj-$(CONFIG_DMABUF_SYSFS_STATS) += dma-buf-sysfs-stats.o
 obj-$(CONFIG_DMABUF_HEAPS_ROCKCHIP) += rk_heaps/
+obj-$(CONFIG_DMABUF_PROCFS)	+= dmabuf_procfs.o

 dmabuf_selftests-y := \
 	selftest.o \
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022 Rockchip Electronics Co. Ltd.
+ */
+
+#include <linux/dma-buf.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/proc_fs.h>
+#include <linux/scatterlist.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+
+#define K(size) ((unsigned long)((size) >> 10))
+static struct device *dmabuf_dev;
+
+static void rk_dmabuf_dump_sgt(struct dma_buf *dmabuf, void *priv)
+{
+	struct seq_file *s = priv;
+	struct scatterlist *sg;
+	struct dma_buf_attachment *a;
+	phys_addr_t end;
+	int i;
+
+	list_for_each_entry(a, &dmabuf->attachments, node) {
+		if (!a->sgt)
+			continue;
+		for_each_sgtable_sg(a->sgt, sg, i) {
+			end = sg->dma_address + sg->length - 1;
+			seq_printf(s, "%4d: ", i);
+			seq_printf(s, "%pa..%pa\t", &sg->dma_address, &end);
+		}
+		break;
+	}
+}
+
+static int rk_dmabuf_cb(const struct dma_buf *dmabuf, void *private)
+{
+	struct seq_file *s = private;
+	struct sg_table *sgt;
+	struct dma_buf_attachment *a;
+	struct dma_buf *db = (struct dma_buf *)dmabuf;
+	bool need_map = list_empty(&db->attachments);
+
+	seq_printf(s, "%s\t%32s %10lu KiB", db->name, db->exp_name, K(db->size));
+
+	if (need_map) {
+		a = dma_buf_attach(db, dmabuf_dev);
+		if (IS_ERR_OR_NULL(a))
+			return PTR_ERR(a);
+
+		sgt = dma_buf_map_attachment(a, 0);
+		if (IS_ERR_OR_NULL(sgt))
+			return PTR_ERR(sgt);
+	}
+
+	rk_dmabuf_dump_sgt(db, s);
+
+	if (need_map) {
+		dma_buf_unmap_attachment(a, sgt, 0);
+		dma_buf_detach(db, a);
+	}
+
+	seq_puts(s, "\n");
+
+	return 0;
+}
+
+static int rk_dmabuf_show(struct seq_file *s, void *v)
+{
+	seq_printf(s, "%s\t%32s %14s %8s\n\n", "NAME", "EXPORT", "SIZE:KiB", "SGLIST");
+
+	return get_each_dmabuf(rk_dmabuf_cb, s);
+}
+
+static int __init rk_dmabuf_init(void)
+{
+	struct platform_device *pdev;
+	struct platform_device_info dev_info = {
+		.name		= "dmabuf",
+		.id		= PLATFORM_DEVID_AUTO,
+		.dma_mask	= DMA_BIT_MASK(32),
+	};
+
+	pdev = platform_device_register_full(&dev_info);
+	dmabuf_dev = pdev ? &pdev->dev : NULL;
+
+	proc_create_single("rk_dmabuf", 0, NULL, rk_dmabuf_show);
+
+	return 0;
+}
+late_initcall_sync(rk_dmabuf_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jianqun Xu <jay.xu@rock-chips.com>");
+MODULE_DESCRIPTION("ROCKCHIP DMABUF Driver");
+MODULE_ALIAS("platform:rk-dmabuf");