Messages in this thread Patch in this message |  | | From | Chao Gao <> | Subject | [RESEND PATCH 2/3] swiotlb: consolidate rounding up default_nslabs | Date | Mon, 18 Jul 2022 09:16:06 +0800 |
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default_nslabs are rounded up in two cases with exactly same comments. Add a simple wrapper to reduce duplicate code/comments. It is preparatory to adding more logics into the round-up.
No functional change intended.
Signed-off-by: Chao Gao <chao.gao@intel.com> --- kernel/dma/swiotlb.c | 34 ++++++++++++++++++---------------- 1 file changed, 18 insertions(+), 16 deletions(-)
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 0d0f99146360..9ab87d6d47bc 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -88,6 +88,22 @@ struct io_tlb_area { spinlock_t lock; }; +/* + * Round up number of slabs to the next power of 2. The last area is going + * be smaller than the rest if default_nslabs is not power of two. + * + * Return true if default_nslabs is rounded up. + */ +static bool round_up_default_nslabs(void) +{ + if (!default_nareas || is_power_of_2(default_nslabs)) + return false; + + default_nslabs = roundup_pow_of_two(default_nslabs); + + return true; +} + static void swiotlb_adjust_nareas(unsigned int nareas) { if (!is_power_of_2(nareas)) @@ -96,16 +112,9 @@ static void swiotlb_adjust_nareas(unsigned int nareas) default_nareas = nareas; pr_info("area num %d.\n", nareas); - /* - * Round up number of slabs to the next power of 2. - * The last area is going be smaller than the rest if - * default_nslabs is not power of two. - */ - if (nareas && !is_power_of_2(default_nslabs)) { - default_nslabs = roundup_pow_of_two(default_nslabs); + if (round_up_default_nslabs()) pr_info("SWIOTLB bounce buffer size roundup to %luMB", (default_nslabs << IO_TLB_SHIFT) >> 20); - } } static int __init @@ -154,17 +163,10 @@ void __init swiotlb_adjust_size(unsigned long size) if (default_nslabs != IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT) return; - /* - * Round up number of slabs to the next power of 2. - * The last area is going be smaller than the rest if - * default_nslabs is not power of two. - */ size = ALIGN(size, IO_TLB_SIZE); default_nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE); - if (default_nareas) { - default_nslabs = roundup_pow_of_two(default_nslabs); + if (round_up_default_nslabs()) size = default_nslabs << IO_TLB_SHIFT; - } pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20); } -- 2.25.1
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