mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-27 12:57:53 +00:00
c6af2aa9ff
Pass a boolean flag to indicate if swiotlb needs to be enabled based on the addressing needs, and replace the verbose argument with a set of flags, including one to force enable bounce buffering. Note that this patch removes the possibility to force xen-swiotlb use with the swiotlb=force parameter on the command line on x86 (arm and arm64 never supported that), but this interface will be restored shortly. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
28 lines
817 B
C
28 lines
817 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/dma-direct.h>
|
|
#include <linux/init.h>
|
|
#include <linux/swiotlb.h>
|
|
#include <boot_param.h>
|
|
|
|
dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
|
|
{
|
|
/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
|
|
* Loongson-3's 48bit address space and embed it into 40bit */
|
|
long nid = (paddr >> 44) & 0x3;
|
|
|
|
return ((nid << 44) ^ paddr) | (nid << node_id_offset);
|
|
}
|
|
|
|
phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
|
|
{
|
|
/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
|
|
* Loongson-3's 48bit address space and embed it into 40bit */
|
|
long nid = (daddr >> node_id_offset) & 0x3;
|
|
|
|
return ((nid << node_id_offset) ^ daddr) | (nid << 44);
|
|
}
|
|
|
|
void __init plat_swiotlb_setup(void)
|
|
{
|
|
swiotlb_init(true, SWIOTLB_VERBOSE);
|
|
}
|