[PATCH AUTOSEL 5.18 001/159] iommu/vt-d: Add RPLS to quirk list to skip TE disabling

[PATCH AUTOSEL 5.18 001/159] iommu/vt-d: Add RPLS to quirk list to skip TE disabling

[Sasha Levin]

From: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>

[ Upstream commit 0a967f5bfd9134b89681cae58deb222e20840e76 ]

The VT-d spec requires (10.4.4 Global Command Register, TE
field) that:

Hardware implementations supporting DMA draining must drain
any in-flight DMA read/write requests queued within the
Root-Complex before completing the translation enable
command and reflecting the status of the command through
the TES field in the Global Status register.

Unfortunately, some integrated graphic devices fail to do
so after some kind of power state transition. As the
result, the system might stuck in iommu_disable_translati
on(), waiting for the completion of TE transition.

This adds RPLS to a quirk list for those devices and skips
TE disabling if the qurik hits.

Link: https://gitlab.freedesktop.org/drm/intel/-/issues/4898
Tested-by: Raviteja Goud Talla <ravitejax.goud.talla@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220302043256.191529-1-tejaskumarx.surendrakumar.upadhyay@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/intel/iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 0ea47e17b379..ba9a63cac47c 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5031,7 +5031,7 @@ static void quirk_igfx_skip_te_disable(struct pci_dev *dev)
 	ver = (dev->device >> 8) & 0xff;
 	if (ver != 0x45 && ver != 0x46 && ver != 0x4c &&
 	    ver != 0x4e && ver != 0x8a && ver != 0x98 &&
-	    ver != 0x9a)
+	    ver != 0x9a && ver != 0xa7)
 		return;
 
 	if (risky_device(dev))
-- 
2.35.1

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[PATCH AUTOSEL 5.18 100/159] dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC

[Sasha Levin]

From: Mikulas Patocka <mpatocka@redhat.com>

[ Upstream commit 84bc4f1dbbbb5f8aa68706a96711dccb28b518e5 ]

We observed the error "cacheline tracking ENOMEM, dma-debug disabled"
during a light system load (copying some files). The reason for this error
is that the dma_active_cacheline radix tree uses GFP_NOWAIT allocation -
so it can't access the emergency memory reserves and it fails as soon as
anybody reaches the watermark.

This patch changes GFP_NOWAIT to GFP_ATOMIC, so that it can access the
emergency memory reserves.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 kernel/dma/debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index f8ff598596b8..ac740630c79c 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -448,7 +448,7 @@ void debug_dma_dump_mappings(struct device *dev)
  * other hand, consumes a single dma_debug_entry, but inserts 'nents'
  * entries into the tree.
  */
-static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
+static RADIX_TREE(dma_active_cacheline, GFP_ATOMIC);
 static DEFINE_SPINLOCK(radix_lock);
 #define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
 #define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT)
-- 
2.35.1

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