Date: Mon, 18 May 2020 09:37:03 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r361203 - stable/12/sys/compat/linuxkpi/common/include/linux Message-ID: <202005180937.04I9b3oP071505@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: hselasky Date: Mon May 18 09:37:02 2020 New Revision: 361203 URL: https://svnweb.freebsd.org/changeset/base/361203 Log: MFC r360622: Implement more scatter and gather functions in the LinuxKPI. Differential Revision: https://reviews.freebsd.org/D24611 Submitted by: ashafer_badland.io (Austin Shafer) Sponsored by: Mellanox Technologies Modified: stable/12/sys/compat/linuxkpi/common/include/linux/scatterlist.h Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/compat/linuxkpi/common/include/linux/scatterlist.h ============================================================================== --- stable/12/sys/compat/linuxkpi/common/include/linux/scatterlist.h Mon May 18 09:36:14 2020 (r361202) +++ stable/12/sys/compat/linuxkpi/common/include/linux/scatterlist.h Mon May 18 09:37:02 2020 (r361203) @@ -66,6 +66,10 @@ struct sg_page_iter { } internal; }; +struct sg_dma_page_iter { + struct sg_page_iter base; +}; + #define SCATTERLIST_MAX_SEGMENT (-1U & ~(PAGE_SIZE - 1)) #define SG_MAX_SINGLE_ALLOC (PAGE_SIZE / sizeof(struct scatterlist)) @@ -85,6 +89,8 @@ struct sg_page_iter { #define for_each_sg_page(sgl, iter, nents, pgoffset) \ for (_sg_iter_init(sgl, iter, nents, pgoffset); \ (iter)->sg; _sg_iter_next(iter)) +#define for_each_sg_dma_page(sgl, iter, nents, pgoffset) \ + for_each_sg_page(sgl, &(iter)->base, nents, pgoffset) #define for_each_sg(sglist, sg, sgmax, iter) \ for (iter = 0, sg = (sglist); iter < (sgmax); iter++, sg = sg_next(sg)) @@ -404,6 +410,8 @@ sg_page_count(struct scatterlist *sg) { return (PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT); } +#define sg_dma_page_count(sg) \ + sg_page_count(sg) static inline bool __sg_page_iter_next(struct sg_page_iter *piter) @@ -426,6 +434,8 @@ __sg_page_iter_next(struct sg_page_iter *piter) } return (1); } +#define __sg_page_iter_dma_next(itr) \ + __sg_page_iter_next(&(itr)->base) static inline void _sg_iter_init(struct scatterlist *sgl, struct sg_page_iter *iter, @@ -443,11 +453,20 @@ _sg_iter_init(struct scatterlist *sgl, struct sg_page_ } } -static inline dma_addr_t -sg_page_iter_dma_address(struct sg_page_iter *spi) -{ - return (spi->sg->dma_address + (spi->sg_pgoffset << PAGE_SHIFT)); -} +/* + * sg_page_iter_dma_address() is implemented as a macro because it + * needs to accept two different and identical structure types. This + * allows both old and new code to co-exist. The compile time assert + * adds some safety, that the structure sizes match. + */ +#define sg_page_iter_dma_address(spi) ({ \ + struct sg_page_iter *__spi = (void *)(spi); \ + dma_addr_t __dma_address; \ + CTASSERT(sizeof(*(spi)) == sizeof(*__spi)); \ + __dma_address = __spi->sg->dma_address + \ + (__spi->sg_pgoffset << PAGE_SHIFT); \ + __dma_address; \ +}) static inline struct page * sg_page_iter_page(struct sg_page_iter *piter)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202005180937.04I9b3oP071505>