65b017b420
This patch improves the boundary checks in busdma to allow more cases using the regular page based kernel memory allocator. Especially in the case of having a non-zero boundary in the parent DMA tag. For example AMD64 based platforms set the PCI DMA tag boundary to PCI_DMA_BOUNDARY, 4GB, which before this patch caused contiguous memory allocations to be preferred when allocating more than PAGE_SIZE bytes. Even if the required alignment was less than PAGE_SIZE bytes. This patch also fixes the nsegments check for using kmem_alloc_attr() when the maximum segment size is less than PAGE_SIZE bytes. Updated some comments describing the code in question. Differential Revision: https://reviews.freebsd.org/D10645 Reviewed by: kib, jhb, gallatin, scottl MFC after: 1 week Sponsored by: Mellanox Technologies |
||
---|---|---|
.. | ||
allwinner | ||
altera/socfpga | ||
amlogic/aml8726 | ||
annapurna/alpine | ||
arm | ||
at91 | ||
broadcom/bcm2835 | ||
cavium/cns11xx | ||
cloudabi32 | ||
conf | ||
freescale | ||
include | ||
lpc | ||
mv | ||
nvidia | ||
qemu | ||
ralink | ||
rockchip | ||
samsung/exynos | ||
ti | ||
versatile | ||
xilinx | ||
xscale |