IOMMU Archive on lore.kernel.org
 help / color / Atom feed
From: Filippo Sironi via iommu <iommu@lists.linux-foundation.org>
To: sironi@amazon.de, joro@8bytes.org,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: [PATCH 4/5] iommu/amd: Hold the domain lock when calling iommu_map_page
Date: Tue, 10 Sep 2019 19:49:24 +0200
Message-ID: <1568137765-20278-5-git-send-email-sironi@amazon.de> (raw)
In-Reply-To: <1568137765-20278-1-git-send-email-sironi@amazon.de>

iommu_map_page calls into __domain_flush_pages, which requires the
domain lock since it traverses the device list, which the lock protects.

Signed-off-by: Filippo Sironi <sironi@amazon.de>
---
 drivers/iommu/amd_iommu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index d4f25767622e..3714ae5ded31 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2562,6 +2562,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 	unsigned long address;
 	u64 dma_mask;
 	int ret;
+	unsigned long flags;
 
 	domain = get_domain(dev);
 	if (IS_ERR(domain))
@@ -2587,7 +2588,9 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 
 			bus_addr  = address + s->dma_address + (j << PAGE_SHIFT);
 			phys_addr = (sg_phys(s) & PAGE_MASK) + (j << PAGE_SHIFT);
+			spin_lock_irqsave(&domain->lock, flags);
 			ret = iommu_map_page(domain, bus_addr, phys_addr, PAGE_SIZE, prot, GFP_ATOMIC);
+			spin_unlock_irqrestore(&domain->lock, flags);
 			if (ret)
 				goto out_unmap;
 
@@ -3095,7 +3098,9 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
 		prot |= IOMMU_PROT_IW;
 
 	mutex_lock(&domain->api_lock);
+	spin_lock(&domain->lock);
 	ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
+	spin_unlock(&domain->lock);
 	mutex_unlock(&domain->api_lock);
 
 	domain_flush_np_cache(domain, iova, page_size);
-- 
2.7.4

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-10 17:49 iommu/amd: Flushing and locking fixes Filippo Sironi via iommu
2019-09-10 17:49 ` [PATCH 1/5] iommu/amd: Wait for completion of IOTLB flush in attach_device Filippo Sironi via iommu
2019-09-24  9:41   ` Joerg Roedel
2019-09-10 17:49 ` [PATCH 2/5] iommu/amd: Hold the domain lock when calling __map_single Filippo Sironi via iommu
2019-09-10 17:49 ` [PATCH 3/5] iommu/amd: Hold the domain lock when calling __unmap_single Filippo Sironi via iommu
2019-09-10 17:49 ` Filippo Sironi via iommu [this message]
2019-09-20 18:05   ` [PATCH 4/5] iommu/amd: Hold the domain lock when calling iommu_map_page Sironi, Filippo via iommu
2019-09-10 17:49 ` [PATCH 5/5] iommu/amd: Hold the domain lock when calling domain_flush_tlb[_pde] Filippo Sironi via iommu
2019-09-11 11:34 ` iommu/amd: Flushing and locking fixes Joerg Roedel
2019-09-13 17:37   ` Sironi, Filippo via iommu

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1568137765-20278-5-git-send-email-sironi@amazon.de \
    --to=iommu@lists.linux-foundation.org \
    --cc=joro@8bytes.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sironi@amazon.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

IOMMU Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-iommu/0 linux-iommu/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-iommu linux-iommu/ https://lore.kernel.org/linux-iommu \
		iommu@lists.linux-foundation.org iommu@archiver.kernel.org
	public-inbox-index linux-iommu

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.linux-foundation.lists.iommu


AGPL code for this site: git clone https://public-inbox.org/ public-inbox