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Date: Wed, 29 Nov 2023 21:10:08 -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 01/30] iommu/of: Make a of_iommu_for_each_id()
Take the existing machinery that was wired to invoking of_xlate on each id
through the various maps and aliases and allow it to call a function
pointer with an opaque.
Call of_iommu_xlate() using the existing of_iommu_for_each_id().
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
---
drivers/iommu/of_iommu.c | 82 ++++++++++++++++++++++------------------
1 file changed, 46 insertions(+), 36 deletions(-)
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 164317bfb8a81f..3d4580f1fbb378 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -17,9 +17,9 @@
#include <linux/slab.h>
#include <linux/fsl/mc.h>
-static int of_iommu_xlate(struct device *dev,
- struct of_phandle_args *iommu_spec)
+static int of_iommu_xlate(struct of_phandle_args *iommu_spec, void *info)
{
+ struct device *dev = info;
const struct iommu_ops *ops;
struct fwnode_handle *fwnode = &iommu_spec->np->fwnode;
int ret;
@@ -48,26 +48,27 @@ static int of_iommu_xlate(struct device *dev,
return ret;
}
-static int of_iommu_configure_dev_id(struct device_node *master_np,
- struct device *dev,
- const u32 *id)
+typedef int (*of_for_each_fn)(struct of_phandle_args *args, void *info);
+
+static int __for_each_map_id(struct device_node *master_np, u32 id,
+ of_for_each_fn fn, void *info)
{
struct of_phandle_args iommu_spec = { .args_count = 1 };
int err;
- err = of_map_id(master_np, *id, "iommu-map",
+ err = of_map_id(master_np, id, "iommu-map",
"iommu-map-mask", &iommu_spec.np,
iommu_spec.args);
if (err)
return err;
- err = of_iommu_xlate(dev, &iommu_spec);
+ err = fn(&iommu_spec, info);
of_node_put(iommu_spec.np);
return err;
}
-static int of_iommu_configure_dev(struct device_node *master_np,
- struct device *dev)
+static int __for_each_iommus(struct device_node *master_np, of_for_each_fn fn,
+ void *info)
{
struct of_phandle_args iommu_spec;
int err = -ENODEV, idx = 0;
@@ -75,7 +76,7 @@ static int of_iommu_configure_dev(struct device_node *master_np,
while (!of_parse_phandle_with_args(master_np, "iommus",
"#iommu-cells",
idx, &iommu_spec)) {
- err = of_iommu_xlate(dev, &iommu_spec);
+ err = fn(&iommu_spec, info);
of_node_put(iommu_spec.np);
idx++;
if (err)
@@ -86,23 +87,46 @@ static int of_iommu_configure_dev(struct device_node *master_np,
}
struct of_pci_iommu_alias_info {
- struct device *dev;
struct device_node *np;
+ of_for_each_fn fn;
+ void *info;
};
-static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
+static int __for_each_map_pci(struct pci_dev *pdev, u16 alias, void *data)
{
- struct of_pci_iommu_alias_info *info = data;
- u32 input_id = alias;
+ struct of_pci_iommu_alias_info *pci_info = data;
- return of_iommu_configure_dev_id(info->np, info->dev, &input_id);
+ return __for_each_map_id(pci_info->np, alias, pci_info->fn,
+ pci_info->info);
}
-static int of_iommu_configure_device(struct device_node *master_np,
- struct device *dev, const u32 *id)
+static int of_iommu_for_each_id(struct device *dev,
+ struct device_node *master_np, const u32 *id,
+ of_for_each_fn fn, void *info)
{
- return (id) ? of_iommu_configure_dev_id(master_np, dev, id) :
- of_iommu_configure_dev(master_np, dev);
+ /*
+ * We don't currently walk up the tree looking for a parent IOMMU.
+ * See the `Notes:' section of
+ * Documentation/devicetree/bindings/iommu/iommu.txt
+ */
+ if (dev_is_pci(dev)) {
+ struct of_pci_iommu_alias_info pci_info = {
+ .np = master_np,
+ .fn = fn,
+ .info = info,
+ };
+
+ /* In PCI mode the ID comes from the RID */
+ if (WARN_ON(id))
+ return -EINVAL;
+
+ return pci_for_each_dma_alias(to_pci_dev(dev),
+ __for_each_map_pci, &pci_info);
+ }
+
+ if (id)
+ return __for_each_map_id(master_np, *id, fn, info);
+ return __for_each_iommus(master_np, fn, info);
}
/*
@@ -133,25 +157,11 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np,
iommu_fwspec_free(dev);
}
- /*
- * We don't currently walk up the tree looking for a parent IOMMU.
- * See the `Notes:' section of
- * Documentation/devicetree/bindings/iommu/iommu.txt
- */
- if (dev_is_pci(dev)) {
- struct of_pci_iommu_alias_info info = {
- .dev = dev,
- .np = master_np,
- };
-
+ if (dev_is_pci(dev))
pci_request_acs();
- err = pci_for_each_dma_alias(to_pci_dev(dev),
- of_pci_iommu_init, &info);
- } else {
- err = of_iommu_configure_device(master_np, dev, id);
- }
- mutex_unlock(&iommu_probe_device_lock);
+ err = of_iommu_for_each_id(dev, master_np, id, of_iommu_xlate, dev);
+ mutex_unlock(&iommu_probe_device_lock);
if (err == -ENODEV || err == -EPROBE_DEFER)
return err;
if (err)
--
2.42.0
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