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Message-Id: <61972f88e31a6eda8bf5852f0853951164279a3c.1719919669.git.robin.murphy@arm.com>
Date: Tue, 2 Jul 2024 12:40:50 +0100
From: Robin Murphy <robin.murphy@....com>
To: Will Deacon <will@...nel.org>,
Joerg Roedel <joro@...tes.org>
Cc: linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
iommu@...ts.linux.dev,
devicetree@...r.kernel.org,
Rob Herring <robh@...nel.org>,
Saravana Kannan <saravanak@...gle.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Hanjun Guo <guohanjun@...wei.com>,
Sudeep Holla <sudeep.holla@....com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Yong Wu <yong.wu@...iatek.com>
Subject: [PATCH v3 4/5] OF: Simplify of_iommu_configure()
We no longer have a notion of partially-initialised fwspecs existing,
and we also no longer need to use an iommu_ops pointer to return status
to of_dma_configure(). Clean up the remains of those, which lends itself
to clarifying the logic around the dma_range_map allocation as well.
Acked-by: Rob Herring (Arm) <robh@...nel.org>
Tested-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
Signed-off-by: Robin Murphy <robin.murphy@....com>
---
drivers/iommu/of_iommu.c | 29 ++++++++++-------------------
drivers/of/device.c | 30 +++++++++++-------------------
2 files changed, 21 insertions(+), 38 deletions(-)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 08c523ad55ad..c946521a5906 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -108,7 +108,6 @@ static int of_iommu_configure_device(struct device_node *master_np,
int of_iommu_configure(struct device *dev, struct device_node *master_np,
const u32 *id)
{
- struct iommu_fwspec *fwspec;
int err;
if (!master_np)
@@ -116,14 +115,9 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np,
/* Serialise to make dev->iommu stable under our potential fwspec */
mutex_lock(&iommu_probe_device_lock);
- fwspec = dev_iommu_fwspec_get(dev);
- if (fwspec) {
- if (fwspec->ops) {
- mutex_unlock(&iommu_probe_device_lock);
- return 0;
- }
- /* In the deferred case, start again from scratch */
- iommu_fwspec_free(dev);
+ if (dev_iommu_fwspec_get(dev)) {
+ mutex_unlock(&iommu_probe_device_lock);
+ return 0;
}
/*
@@ -143,20 +137,17 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np,
} else {
err = of_iommu_configure_device(master_np, dev, id);
}
+
+ if (err)
+ iommu_fwspec_free(dev);
mutex_unlock(&iommu_probe_device_lock);
- if (err == -ENODEV || err == -EPROBE_DEFER)
- return err;
- if (err)
- goto err_log;
+ if (!err && dev->bus)
+ err = iommu_probe_device(dev);
- err = iommu_probe_device(dev);
- if (err)
- goto err_log;
- return 0;
+ if (err && err != -EPROBE_DEFER)
+ dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
-err_log:
- dev_dbg(dev, "Adding to IOMMU failed: %pe\n", ERR_PTR(err));
return err;
}
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 312c63361211..edf3be197265 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -96,8 +96,7 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
const struct bus_dma_region *map = NULL;
struct device_node *bus_np;
u64 mask, end = 0;
- bool coherent;
- int iommu_ret;
+ bool coherent, set_map = false;
int ret;
if (np == dev->of_node)
@@ -118,6 +117,7 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
} else {
/* Determine the overall bounds of all DMA regions */
end = dma_range_map_max(map);
+ set_map = true;
}
/*
@@ -144,7 +144,7 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
dev->coherent_dma_mask &= mask;
*dev->dma_mask &= mask;
/* ...but only set bus limit and range map if we found valid dma-ranges earlier */
- if (!ret) {
+ if (set_map) {
dev->bus_dma_limit = end;
dev->dma_range_map = map;
}
@@ -153,29 +153,21 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
dev_dbg(dev, "device is%sdma coherent\n",
coherent ? " " : " not ");
- iommu_ret = of_iommu_configure(dev, np, id);
- if (iommu_ret == -EPROBE_DEFER) {
+ ret = of_iommu_configure(dev, np, id);
+ if (ret == -EPROBE_DEFER) {
/* Don't touch range map if it wasn't set from a valid dma-ranges */
- if (!ret)
+ if (set_map)
dev->dma_range_map = NULL;
kfree(map);
return -EPROBE_DEFER;
- } else if (iommu_ret == -ENODEV) {
- dev_dbg(dev, "device is not behind an iommu\n");
- } else if (iommu_ret) {
- dev_err(dev, "iommu configuration for device failed with %pe\n",
- ERR_PTR(iommu_ret));
-
- /*
- * Historically this routine doesn't fail driver probing
- * due to errors in of_iommu_configure()
- */
- } else
- dev_dbg(dev, "device is behind an iommu\n");
+ }
+ /* Take all other IOMMU errors to mean we'll just carry on without it */
+ dev_dbg(dev, "device is%sbehind an iommu\n",
+ !ret ? " " : " not ");
arch_setup_dma_ops(dev, coherent);
- if (iommu_ret)
+ if (ret)
of_dma_set_restricted_buffer(dev, np);
return 0;
--
2.39.2.101.g768bb238c484.dirty
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