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Date: Thu, 22 Oct 2020 13:06:35 +0800
From: Sherry Sun <sherry.sun@....com>
To: hch@...radead.org, sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
arnd@...db.de, gregkh@...uxfoundation.org, kishon@...com,
lorenzo.pieralisi@....com
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
linux-imx@....com
Subject: [PATCH V3 1/4] misc: vop: change the way of allocating vring and device page
Allocate vrings use dma_alloc_coherent is a common way in kernel. As the
memory interacted between two systems should use consistent memory to
avoid caching effects, same as device page memory.
The orginal way use __get_free_pages and dma_map_single to allocate and
map vring, but not use dma_sync_single_for_cpu/device api to sync the
changes of vring between EP and RC, which will cause memory
synchronization problem for those devices which don't support hardware
dma coherent.
Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
Signed-off-by: Sherry Sun <sherry.sun@....com>
---
drivers/misc/mic/host/mic_main.c | 15 +++--------
drivers/misc/mic/vop/vop_vringh.c | 43 +++++++++----------------------
2 files changed, 16 insertions(+), 42 deletions(-)
diff --git a/drivers/misc/mic/host/mic_main.c b/drivers/misc/mic/host/mic_main.c
index ea4608527ea0..ebacaa35cb47 100644
--- a/drivers/misc/mic/host/mic_main.c
+++ b/drivers/misc/mic/host/mic_main.c
@@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/poll.h>
+#include <linux/dma-mapping.h>
#include <linux/mic_common.h>
#include "../common/mic_dev.h"
@@ -48,18 +49,11 @@ static struct ida g_mic_ida;
/* Initialize the device page */
static int mic_dp_init(struct mic_device *mdev)
{
- mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
+ mdev->dp = dma_alloc_coherent(&mdev->pdev->dev, MIC_DP_SIZE,
+ &mdev->dp_dma_addr, GFP_KERNEL);
if (!mdev->dp)
return -ENOMEM;
- mdev->dp_dma_addr = mic_map_single(mdev,
- mdev->dp, MIC_DP_SIZE);
- if (mic_map_error(mdev->dp_dma_addr)) {
- kfree(mdev->dp);
- dev_err(&mdev->pdev->dev, "%s %d err %d\n",
- __func__, __LINE__, -ENOMEM);
- return -ENOMEM;
- }
mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
return 0;
@@ -68,8 +62,7 @@ static int mic_dp_init(struct mic_device *mdev)
/* Uninitialize the device page */
static void mic_dp_uninit(struct mic_device *mdev)
{
- mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
- kfree(mdev->dp);
+ dma_free_coherent(&mdev->pdev->dev, MIC_DP_SIZE, mdev->dp, mdev->dp_dma_addr);
}
/**
diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c
index 7014ffe88632..2cc3c22482b5 100644
--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -298,9 +298,8 @@ static int vop_virtio_add_device(struct vop_vdev *vdev,
mutex_init(&vvr->vr_mutex);
vr_size = PAGE_ALIGN(round_up(vring_size(num, MIC_VIRTIO_RING_ALIGN), 4) +
sizeof(struct _mic_vring_info));
- vr->va = (void *)
- __get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(vr_size));
+ vr->va = dma_alloc_coherent(vop_dev(vdev), vr_size, &vr_addr,
+ GFP_KERNEL);
if (!vr->va) {
ret = -ENOMEM;
dev_err(vop_dev(vdev), "%s %d err %d\n",
@@ -310,15 +309,6 @@ static int vop_virtio_add_device(struct vop_vdev *vdev,
vr->len = vr_size;
vr->info = vr->va + round_up(vring_size(num, MIC_VIRTIO_RING_ALIGN), 4);
vr->info->magic = cpu_to_le32(MIC_MAGIC + vdev->virtio_id + i);
- vr_addr = dma_map_single(&vpdev->dev, vr->va, vr_size,
- DMA_BIDIRECTIONAL);
- if (dma_mapping_error(&vpdev->dev, vr_addr)) {
- free_pages((unsigned long)vr->va, get_order(vr_size));
- ret = -ENOMEM;
- dev_err(vop_dev(vdev), "%s %d err %d\n",
- __func__, __LINE__, ret);
- goto err;
- }
vqconfig[i].address = cpu_to_le64(vr_addr);
vring_init(&vr->vr, num, vr->va, MIC_VIRTIO_RING_ALIGN);
@@ -339,11 +329,8 @@ static int vop_virtio_add_device(struct vop_vdev *vdev,
dev_dbg(&vpdev->dev,
"%s %d index %d va %p info %p vr_size 0x%x\n",
__func__, __LINE__, i, vr->va, vr->info, vr_size);
- vvr->buf = (void *)__get_free_pages(GFP_KERNEL,
- get_order(VOP_INT_DMA_BUF_SIZE));
- vvr->buf_da = dma_map_single(&vpdev->dev,
- vvr->buf, VOP_INT_DMA_BUF_SIZE,
- DMA_BIDIRECTIONAL);
+ vvr->buf = dma_alloc_coherent(vop_dev(vdev), VOP_INT_DMA_BUF_SIZE,
+ &vvr->buf_da, GFP_KERNEL);
}
snprintf(irqname, sizeof(irqname), "vop%dvirtio%d", vpdev->index,
@@ -382,10 +369,8 @@ static int vop_virtio_add_device(struct vop_vdev *vdev,
for (j = 0; j < i; j++) {
struct vop_vringh *vvr = &vdev->vvr[j];
- dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[j].address),
- vvr->vring.len, DMA_BIDIRECTIONAL);
- free_pages((unsigned long)vvr->vring.va,
- get_order(vvr->vring.len));
+ dma_free_coherent(vop_dev(vdev), vvr->vring.len, vvr->vring.va,
+ le64_to_cpu(vqconfig[j].address));
}
return ret;
}
@@ -433,17 +418,12 @@ static void vop_virtio_del_device(struct vop_vdev *vdev)
for (i = 0; i < vdev->dd->num_vq; i++) {
struct vop_vringh *vvr = &vdev->vvr[i];
- dma_unmap_single(&vpdev->dev,
- vvr->buf_da, VOP_INT_DMA_BUF_SIZE,
- DMA_BIDIRECTIONAL);
- free_pages((unsigned long)vvr->buf,
- get_order(VOP_INT_DMA_BUF_SIZE));
+ dma_free_coherent(vop_dev(vdev), VOP_INT_DMA_BUF_SIZE,
+ vvr->buf, vvr->buf_da);
vringh_kiov_cleanup(&vvr->riov);
vringh_kiov_cleanup(&vvr->wiov);
- dma_unmap_single(&vpdev->dev, le64_to_cpu(vqconfig[i].address),
- vvr->vring.len, DMA_BIDIRECTIONAL);
- free_pages((unsigned long)vvr->vring.va,
- get_order(vvr->vring.len));
+ dma_free_coherent(vop_dev(vdev), vvr->vring.len, vvr->vring.va,
+ le64_to_cpu(vqconfig[i].address));
}
/*
* Order the type update with previous stores. This write barrier
@@ -1047,6 +1027,7 @@ vop_query_offset(struct vop_vdev *vdev, unsigned long offset,
unsigned long *size, unsigned long *pa)
{
struct vop_device *vpdev = vdev->vpdev;
+ struct mic_vqconfig *vqconfig = mic_vq_config(vdev->dd);
unsigned long start = MIC_DP_SIZE;
int i;
@@ -1068,7 +1049,7 @@ vop_query_offset(struct vop_vdev *vdev, unsigned long offset,
struct vop_vringh *vvr = &vdev->vvr[i];
if (offset == start) {
- *pa = virt_to_phys(vvr->vring.va);
+ *pa = vqconfig[i].address;
*size = vvr->vring.len;
return 0;
}
--
2.17.1
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