Re: [PATCH 09/16] dma-direct: Support PCI P2PDMA pages in dma-direct map_sg

On 2021-04-27 1:40 p.m., Jason Gunthorpe wrote:

On Tue, Apr 27, 2021 at 04:33:51PM -0300, Jason Gunthorpe wrote:

quoted

On Thu, Apr 08, 2021 at 11:01:16AM -0600, Logan Gunthorpe wrote:

quoted

Add PCI P2PDMA support for dma_direct_map_sg() so that it can map
PCI P2PDMA pages directly without a hack in the callers. This allows
for heterogeneous SGLs that contain both P2PDMA and regular pages.

SGL segments that contain PCI bus addresses are marked with
sg_mark_pci_p2pdma() and are ignored when unmapped.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
 kernel/dma/direct.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 002268262c9a..108dfb4ecbd5 100644
+++ b/kernel/dma/direct.c

@@ -13,6 +13,7 @@
 #include <linux/vmalloc.h>
 #include <linux/set_memory.h>
 #include <linux/slab.h>
+#include <linux/pci-p2pdma.h>
 #include "direct.h"
 
 /*

@@ -387,19 +388,37 @@ void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl,
 	struct scatterlist *sg;
 	int i;
 
-	for_each_sg(sgl, sg, nents, i)
+	for_each_sg(sgl, sg, nents, i) {
+		if (sg_is_pci_p2pdma(sg)) {
+			sg_unmark_pci_p2pdma(sg);

This doesn't seem nice, the DMA layer should only alter the DMA
portion of the SG, not the other portions. Is it necessary?

Oh, I got it completely wrong what this is for.

This should be named sg_dma_mark_pci_p2p() and similar for other
functions to make it clear it is part of the DMA side of the SG
interface (eg it is like sg_dma_address, sg_dma_len, etc)

Fair point. Yes, I'll rename this for the next version.

Logan