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Message-ID: <6-v1-f82a05539a64+5042-iommu_fwspec_p2_jgg@nvidia.com>
Date: Wed, 29 Nov 2023 21:10:13 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: acpica-devel@...ts.linux.dev,
Andy Gross <agross@...nel.org>,
Alim Akhtar <alim.akhtar@...sung.com>,
Alyssa Rosenzweig <alyssa@...enzweig.io>,
Bjorn Andersson <andersson@...nel.org>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
asahi@...ts.linux.dev,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
devicetree@...r.kernel.org,
Frank Rowand <frowand.list@...il.com>,
Hanjun Guo <guohanjun@...wei.com>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Heiko Stuebner <heiko@...ech.de>,
iommu@...ts.linux.dev,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Joerg Roedel <joro@...tes.org>,
Kees Cook <keescook@...omium.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Len Brown <lenb@...nel.org>,
linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org,
linux-hardening@...r.kernel.org,
linux-mediatek@...ts.infradead.org,
linux-rockchip@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
linux-sunxi@...ts.linux.dev,
linux-tegra@...r.kernel.org,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Hector Martin <marcan@...can.st>,
Matthias Brugger <matthias.bgg@...il.com>,
Orson Zhai <orsonzhai@...il.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Rob Clark <robdclark@...il.com>,
Robert Moore <robert.moore@...el.com>,
Rob Herring <robh+dt@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Samuel Holland <samuel@...lland.org>,
Sudeep Holla <sudeep.holla@....com>,
Sven Peter <sven@...npeter.dev>,
Thierry Reding <thierry.reding@...il.com>,
Krishna Reddy <vdumpa@...dia.com>,
virtualization@...ts.linux.dev,
Chen-Yu Tsai <wens@...e.org>,
Will Deacon <will@...nel.org>,
Yong Wu <yong.wu@...iatek.com>,
Chunyan Zhang <zhang.lyra@...il.com>
Cc: André Draszik <andre.draszik@...aro.org>,
patches@...ts.linux.dev
Subject: [PATCH 06/30] iommu: Make iommu_ops_from_fwnode() return the iommu_device
Return the entire struct iommu_device instead of just the ops. Name
the changed function iommu_device_from_fwnode().
The iommu_device pointer is kept valid because this is always called
under the iommu_probe_device_lock.
If iommu_device is valid then ops is valid too, the module refcounting
is pointless. Remove it.
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
---
drivers/acpi/arm64/iort.c | 12 +++++++-----
drivers/acpi/viot.c | 9 +++++----
drivers/iommu/iommu.c | 20 +++++++++++++-------
drivers/iommu/of_iommu.c | 16 ++++++----------
include/linux/iommu-driver.h | 3 +++
include/linux/iommu.h | 7 -------
6 files changed, 34 insertions(+), 33 deletions(-)
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 93e30f2f5004f0..798c0b344f4be8 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -797,6 +797,8 @@ void acpi_configure_pmsi_domain(struct device *dev)
}
#ifdef CONFIG_IOMMU_API
+#include <linux/iommu-driver.h>
+
static void iort_rmr_free(struct device *dev,
struct iommu_resv_region *region)
{
@@ -1242,7 +1244,7 @@ static int iort_iommu_xlate(struct acpi_iort_node *node, u32 streamid,
void *info)
{
struct device *dev = info;
- const struct iommu_ops *ops;
+ struct iommu_device *iommu;
struct fwnode_handle *iort_fwnode;
if (!node)
@@ -1253,19 +1255,19 @@ static int iort_iommu_xlate(struct acpi_iort_node *node, u32 streamid,
return -ENODEV;
/*
- * If the ops look-up fails, this means that either
+ * If the iommu look-up fails, this means that either
* the SMMU drivers have not been probed yet or that
* the SMMU drivers are not built in the kernel;
* Depending on whether the SMMU drivers are built-in
* in the kernel or not, defer the IOMMU configuration
* or just abort it.
*/
- ops = iommu_ops_from_fwnode(iort_fwnode);
- if (!ops)
+ iommu = iommu_device_from_fwnode(iort_fwnode);
+ if (!iommu)
return iort_iommu_driver_enabled(node->type) ?
-EPROBE_DEFER : -ENODEV;
- return acpi_iommu_fwspec_init(dev, streamid, iort_fwnode, ops);
+ return acpi_iommu_fwspec_init(dev, streamid, iort_fwnode, iommu->ops);
}
struct iort_pci_alias_info {
diff --git a/drivers/acpi/viot.c b/drivers/acpi/viot.c
index 7ab35ef05c84e0..9780b1d477503e 100644
--- a/drivers/acpi/viot.c
+++ b/drivers/acpi/viot.c
@@ -21,6 +21,7 @@
#include <linux/acpi_viot.h>
#include <linux/fwnode.h>
#include <linux/iommu.h>
+#include <linux/iommu-driver.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
@@ -299,7 +300,7 @@ void __init acpi_viot_init(void)
static int viot_dev_iommu_init(struct viot_iommu *viommu, u32 epid, void *info)
{
- const struct iommu_ops *ops;
+ struct iommu_device *iommu;
struct device *dev = info;
if (!viommu)
@@ -309,12 +310,12 @@ static int viot_dev_iommu_init(struct viot_iommu *viommu, u32 epid, void *info)
if (device_match_fwnode(dev, viommu->fwnode))
return -EINVAL;
- ops = iommu_ops_from_fwnode(viommu->fwnode);
- if (!ops)
+ iommu = iommu_device_from_fwnode(viommu->fwnode);
+ if (!iommu)
return IS_ENABLED(CONFIG_VIRTIO_IOMMU) ?
-EPROBE_DEFER : -ENODEV;
- return acpi_iommu_fwspec_init(dev, epid, viommu->fwnode, ops);
+ return acpi_iommu_fwspec_init(dev, epid, viommu->fwnode, iommu->ops);
}
struct viot_pci_iommu_alias_info {
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 76b245973cfafc..45e6543748fd46 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -520,13 +520,19 @@ static int __iommu_probe_device(struct iommu_probe_info *pinf)
* ops for probing, and thus cheekily co-opt the same mechanism.
*/
fwspec = dev_iommu_fwspec_get(dev);
- if (fwspec && fwspec->ops)
+ if (fwspec && fwspec->ops) {
ops = fwspec->ops;
- else
- ops = iommu_ops_from_fwnode(NULL);
+ if (!ops)
+ return -ENODEV;
+ } else {
+ struct iommu_device *iommu;
+
+ iommu = iommu_device_from_fwnode(NULL);
+ if (!iommu)
+ return -ENODEV;
+ ops = iommu->ops;
+ }
- if (!ops)
- return -ENODEV;
/*
* Serialise to avoid races between IOMMU drivers registering in
* parallel and/or the "replay" calls from ACPI/OF code via client
@@ -2997,7 +3003,7 @@ bool iommu_default_passthrough(void)
}
EXPORT_SYMBOL_GPL(iommu_default_passthrough);
-const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
+struct iommu_device *iommu_device_from_fwnode(struct fwnode_handle *fwnode)
{
struct iommu_device *iommu;
@@ -3005,7 +3011,7 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
list_for_each_entry(iommu, &iommu_device_list, list)
if (iommu->fwnode == fwnode)
- return iommu->ops;
+ return iommu;
return NULL;
}
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index fb743ddd239e0b..cf68cdebc9f318 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -21,16 +21,16 @@
static int of_iommu_xlate(struct of_phandle_args *iommu_spec, void *info)
{
struct device *dev = info;
- const struct iommu_ops *ops;
+ struct iommu_device *iommu;
struct fwnode_handle *fwnode = &iommu_spec->np->fwnode;
int ret;
- ops = iommu_ops_from_fwnode(fwnode);
- if ((ops && !ops->of_xlate) ||
+ iommu = iommu_device_from_fwnode(fwnode);
+ if ((iommu && !iommu->ops->of_xlate) ||
!of_device_is_available(iommu_spec->np))
return -ENODEV;
- ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops);
+ ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, iommu->ops);
if (ret)
return ret;
/*
@@ -38,14 +38,10 @@ static int of_iommu_xlate(struct of_phandle_args *iommu_spec, void *info)
* IOMMU device we're waiting for, which will be useful if we ever get
* a proper probe-ordering dependency mechanism in future.
*/
- if (!ops)
+ if (!iommu)
return driver_deferred_probe_check_state(dev);
- if (!try_module_get(ops->owner))
- return -ENODEV;
-
- ret = ops->of_xlate(dev, iommu_spec);
- module_put(ops->owner);
+ ret = iommu->ops->of_xlate(dev, iommu_spec);
return ret;
}
diff --git a/include/linux/iommu-driver.h b/include/linux/iommu-driver.h
index b85c9f15cf478b..636b5b5f18f76f 100644
--- a/include/linux/iommu-driver.h
+++ b/include/linux/iommu-driver.h
@@ -14,6 +14,8 @@
#include <linux/types.h>
+struct fwnode_handle;
+
struct iommu_probe_info {
struct device *dev;
struct list_head *deferred_group_list;
@@ -21,5 +23,6 @@ struct iommu_probe_info {
};
int iommu_probe_device_pinf(struct iommu_probe_info *pinf);
+struct iommu_device *iommu_device_from_fwnode(struct fwnode_handle *fwnode);
#endif
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index cf578b8e0b59a4..f0aaf55db3c09b 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -819,7 +819,6 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
-const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode);
static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
{
@@ -1168,12 +1167,6 @@ static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
return -ENODEV;
}
-static inline
-const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
-{
- return NULL;
-}
-
static inline int
iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
--
2.42.0
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