This is a note to let you know that I've just added the patch titled
powerpc/pseries/ddw: simplify enable_ddw()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pseries-ddw-simplify-enable_ddw.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 43c7548c2667c29992a03b80208d4d73beab7daa
Author: Alexey Kardashevskiy <aik@xxxxxxxxx>
Date: Mon Nov 8 15:03:18 2021 +1100
powerpc/pseries/ddw: simplify enable_ddw()
[ Upstream commit fb4ee2b30cd09e95524640149e4ee0d7f22c3e7b ]
This drops rather useless ddw_enabled flag as direct_mapping implies
it anyway.
While at this, fix indents in enable_ddw().
This should not cause any behavioral change.
Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211108040320.3857636-3-aik@xxxxxxxxx
Stable-dep-of: 3bf983e4e93c ("powerpc/pseries/iommu: enable_ddw incorrectly returns direct mapping for SR-IOV device")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index ec5d84b4958c5..aa5f8074e9b10 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -1241,7 +1241,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
u32 ddw_avail[DDW_APPLICABLE_SIZE];
struct dma_win *window;
struct property *win64;
- bool ddw_enabled = false;
struct failed_ddw_pdn *fpdn;
bool default_win_removed = false, direct_mapping = false;
bool pmem_present;
@@ -1256,7 +1255,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
if (find_existing_ddw(pdn, &dev->dev.archdata.dma_offset, &len)) {
direct_mapping = (len >= max_ram_len);
- ddw_enabled = true;
goto out_unlock;
}
@@ -1411,8 +1409,8 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
dev_info(&dev->dev, "failed to map DMA window for %pOF: %d\n",
dn, ret);
- /* Make sure to clean DDW if any TCE was set*/
- clean_dma_window(pdn, win64->value);
+ /* Make sure to clean DDW if any TCE was set*/
+ clean_dma_window(pdn, win64->value);
goto out_del_list;
}
} else {
@@ -1459,7 +1457,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
spin_unlock(&dma_win_list_lock);
dev->dev.archdata.dma_offset = win_addr;
- ddw_enabled = true;
goto out_unlock;
out_del_list:
@@ -1495,10 +1492,10 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
* as RAM, then we failed to create a window to cover persistent
* memory and need to set the DMA limit.
*/
- if (pmem_present && ddw_enabled && direct_mapping && len == max_ram_len)
+ if (pmem_present && direct_mapping && len == max_ram_len)
dev->dev.bus_dma_limit = dev->dev.archdata.dma_offset + (1ULL << len);
- return ddw_enabled && direct_mapping;
+ return direct_mapping;
}
static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
