linux-kernel - [PATCH 5.7 477/477] iommu/vt-d: Remove real DMA lookup in find

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Message-Id: <20200623195430.097419726@linuxfoundation.org>
Date:   Tue, 23 Jun 2020 21:57:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <jroedel@...e.de>,
        Sushma Kalakota <sushmax.kalakota@...el.com>
Subject: [PATCH 5.7 477/477] iommu/vt-d: Remove real DMA lookup in find_domain

From: Jon Derrick <jonathan.derrick@...el.com>

commit bba9cc2cf82840bd3c9b3f4f7edac2dc8329c241 upstream.

By removing the real DMA indirection in find_domain(), we can allow
sub-devices of a real DMA device to have their own valid
device_domain_info. The dmar lookup and context entry removal paths have
been fixed to account for sub-devices.

Fixes: 2b0140c69637 ("iommu/vt-d: Use pci_real_dma_dev() for mapping")
Signed-off-by: Jon Derrick <jonathan.derrick@...el.com>
Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
Link: https://lore.kernel.org/r/20200527165617.297470-4-jonathan.derrick@intel.com
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207575
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sushma Kalakota <sushmax.kalakota@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2518,9 +2518,6 @@ struct dmar_domain *find_domain(struct d
 	if (unlikely(attach_deferred(dev) || iommu_dummy(dev)))
 		return NULL;
 
-	if (dev_is_pci(dev))
-		dev = &pci_real_dma_dev(to_pci_dev(dev))->dev;
-
 	/* No lock here, assumes no domain exit in normal case */
 	info = dev->archdata.iommu;
 	if (likely(info))