[PATCH v7 02/15] swiotlb: Refactor swiotlb_create_debugfs
From: Claire Chang <hidden>
Date: 2021-05-18 06:42:54
Also in:
dri-devel, intel-gfx, linux-devicetree, linux-iommu, linux-pci, lkml, xen-devel
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
Split the debugfs creation to make the code reusable for supporting different bounce buffer pools, e.g. restricted DMA pool. Signed-off-by: Claire Chang <redacted> --- kernel/dma/swiotlb.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index d3232fc19385..b849b01a446f 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c@@ -64,6 +64,7 @@ enum swiotlb_force swiotlb_force; struct io_tlb_mem *io_tlb_default_mem; +static struct dentry *debugfs_dir; /* * Max segment that we can provide which (if pages are contingous) will
@@ -662,18 +663,30 @@ EXPORT_SYMBOL_GPL(is_swiotlb_active); #ifdef CONFIG_DEBUG_FS -static int __init swiotlb_create_debugfs(void) +static void swiotlb_create_debugfs(struct io_tlb_mem *mem, const char *name) { - struct io_tlb_mem *mem = io_tlb_default_mem; - if (!mem) - return 0; - mem->debugfs = debugfs_create_dir("swiotlb", NULL); + return; + + mem->debugfs = debugfs_create_dir(name, debugfs_dir); debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs); debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &mem->used); +} + +static int __init swiotlb_create_default_debugfs(void) +{ + struct io_tlb_mem *mem = io_tlb_default_mem; + + if (mem) { + swiotlb_create_debugfs(mem, "swiotlb"); + debugfs_dir = mem->debugfs; + } else { + debugfs_dir = debugfs_create_dir("swiotlb", NULL); + } + return 0; } -late_initcall(swiotlb_create_debugfs); +late_initcall(swiotlb_create_default_debugfs); #endif
--
2.31.1.751.gd2f1c929bd-goog