Date: Thu, 18 Feb 2021 21:19:36 GMT From: Mitchell Horne <mhorne@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 04d2d2d7fd22 - main - cgem: improve usage of busdma(9) KPI Message-ID: <202102182119.11ILJaaE098874@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch main has been updated by mhorne: URL: https://cgit.FreeBSD.org/src/commit/?id=04d2d2d7fd22bba638ccb5a0b2e0805087a70cd3 commit 04d2d2d7fd22bba638ccb5a0b2e0805087a70cd3 Author: Mitchell Horne <mhorne@FreeBSD.org> AuthorDate: 2021-01-20 15:07:53 +0000 Commit: Mitchell Horne <mhorne@FreeBSD.org> CommitDate: 2021-02-18 21:17:41 +0000 cgem: improve usage of busdma(9) KPI BUS_DMA_NOCACHE should only be used when one needs to guarantee the created mapping has uncached memory attributes, usually as a result of buggy hardware. Normal use cases should pass BUS_DMA_COHERENT, to create an appropriate mapping based on the flags passed to bus_dma_tag_create(). This should have no functional change, since the DMA tags in this driver are created without the BUS_DMA_COHERENT flag. Reported by: mmel Reviewed by: mmel, Thomas Skibo <thomas-bsd@skibo.net> MFC after: 3 days --- sys/dev/cadence/if_cgem.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/sys/dev/cadence/if_cgem.c b/sys/dev/cadence/if_cgem.c index 81fc39b831af..0583e846458a 100644 --- a/sys/dev/cadence/if_cgem.c +++ b/sys/dev/cadence/if_cgem.c @@ -443,17 +443,13 @@ cgem_setup_descs(struct cgem_softc *sc) return (err); /* - * Allocate DMA memory in non-cacheable space. We allocate transmit, - * receive and null descriptor queues all at once because the - * hardware only provides one register for the upper 32 bits of - * rx and tx descriptor queues hardware addresses. + * Allocate DMA memory. We allocate transmit, receive and null + * descriptor queues all at once because the hardware only provides + * one register for the upper 32 bits of rx and tx descriptor queues + * hardware addresses. */ err = bus_dmamem_alloc(sc->desc_dma_tag, (void **)&sc->rxring, -#ifdef __arm__ BUS_DMA_NOWAIT | BUS_DMA_COHERENT | BUS_DMA_ZERO, -#else - BUS_DMA_NOWAIT | BUS_DMA_NOCACHE | BUS_DMA_ZERO, -#endif &sc->rxring_dma_map); if (err) return (err);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202102182119.11ILJaaE098874>