Differential D26598 Diff 77724 sys/compat/linuxkpi/common/include/linux/scatterlist.h

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sys/compat/linuxkpi/common/include/linux/scatterlist.h

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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF		* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.		* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*		*
* $FreeBSD$		* $FreeBSD$
*/		*/
#ifndef _LINUX_SCATTERLIST_H_		#ifndef _LINUX_SCATTERLIST_H_
#define _LINUX_SCATTERLIST_H_		#define _LINUX_SCATTERLIST_H_

		#include <sys/types.h>
		#include <sys/sf_buf.h>

#include <linux/page.h>		#include <linux/page.h>
#include <linux/slab.h>		#include <linux/slab.h>
#include <linux/mm.h>		#include <linux/mm.h>

struct bus_dmamap;		struct bus_dmamap;
struct scatterlist {		struct scatterlist {
unsigned long page_link;		unsigned long page_link;
#define SG_PAGE_LINK_CHAIN 0x1UL		#define SG_PAGE_LINK_CHAIN 0x1UL
▲ Show 20 Lines • Show All 429 Lines • ▼ Show 20 Lines	__dma_address = __spi->sg->dma_address + \
(__spi->sg_pgoffset << PAGE_SHIFT); \		(__spi->sg_pgoffset << PAGE_SHIFT); \
__dma_address; \		__dma_address; \
})		})

static inline struct page *		static inline struct page *
sg_page_iter_page(struct sg_page_iter *piter)		sg_page_iter_page(struct sg_page_iter *piter)
{		{
return (nth_page(sg_page(piter->sg), piter->sg_pgoffset));		return (nth_page(sg_page(piter->sg), piter->sg_pgoffset));
		}

		static __inline size_t
		sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
		const void *buf, size_t buflen, off_t skip)
		{
		struct sg_page_iter piter;
		struct page *page;
		struct sf_buf *sf;
		size_t len, copied;
		char p, b;

		if (buflen == 0)
		return (0);

		b = __DECONST(char *, buf);
		copied = 0;
		sched_pin();
		for_each_sg_page(sgl, &piter, nents, 0) {

		/* Skip to the start. */
		if (piter.sg->length <= skip) {
		skip -= piter.sg->length;
		continue;
		}

		/* See how much to copy. */
		KASSERT(((piter.sg->length - skip) != 0 && (buflen != 0)),
		("%s: sg len %u - skip %ju \|\| buflen %zu is 0\n",
		__func__, piter.sg->length, (uintmax_t)skip, buflen));
		len = min(piter.sg->length - skip, buflen);

		page = sg_page_iter_page(&piter);
		sf = sf_buf_alloc(page, SFB_CPUPRIVATE \| SFB_NOWAIT);
		if (sf == NULL)
		break;
		p = (char *)sf_buf_kva(sf) + piter.sg_pgoffset + skip;
		memcpy(p, b, len);
		sf_buf_free(sf);

		copied += len;
		/* Either we exactly filled the page, or we are done. */
		buflen -= len;
		if (buflen == 0)
		break;
		skip -= len;
		b += len;
		}
		sched_unpin();

		return (copied);
}		}

#endif /* _LINUX_SCATTERLIST_H_ */		#endif /* _LINUX_SCATTERLIST_H_ */