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Date: Wed, 8 Apr 2020 21:11:11 +0200
From: Joerg Roedel <joro@...tes.org>
To: Robin Murphy <robin.murphy@....com>
Cc: Will Deacon <will@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
David Woodhouse <dwmw2@...radead.org>,
Lu Baolu <baolu.lu@...ux.intel.com>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Rob Clark <robdclark@...il.com>,
Heiko Stuebner <heiko@...ech.de>,
Gerald Schaefer <gerald.schaefer@...ibm.com>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-mediatek@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-s390@...r.kernel.org,
linux-tegra@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
Joerg Roedel <jroedel@...e.de>
Subject: Re: [RFC PATCH 17/34] iommu/arm-smmu: Store device instead of group
in arm_smmu_s2cr
On Wed, Apr 08, 2020 at 04:07:33PM +0100, Robin Murphy wrote:
> On 2020-04-08 3:37 pm, Joerg Roedel wrote:
> Isn't that exactly what I suggested? :)
Okay, I dropped this patch and updated the next one.
> I don't recall for sure, but knowing me, that bit of group bookkeeping is
> only where it currently is because it cheekily saves iterating the IDs a
> second time. I don't think there's any technical reason.
I leave it up to you to make any changes on that :)
Updated patch below. I also noticed that I deleted too much from
arm-smmu-v3 in the previous version, fixed that too.
>From a1d2821235a6c26b668b47ec0e84ad0316524406 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <jroedel@...e.de>
Date: Mon, 30 Mar 2020 17:39:04 +0200
Subject: [PATCH] iommu/arm-smmu: Convert to probe/release_device() call-backs
Convert the arm-smmu and arm-smmu-v3 drivers to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code does the
group and sysfs setup.
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
drivers/iommu/arm-smmu-v3.c | 38 ++++++++++--------------------------
drivers/iommu/arm-smmu.c | 39 ++++++++++++++-----------------------
2 files changed, 25 insertions(+), 52 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 82508730feb7..42e1ee7e5197 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2914,27 +2914,26 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid)
static struct iommu_ops arm_smmu_ops;
-static int arm_smmu_add_device(struct device *dev)
+static struct iommu_device *arm_smmu_probe_device(struct device *dev)
{
int i, ret;
struct arm_smmu_device *smmu;
struct arm_smmu_master *master;
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- struct iommu_group *group;
if (!fwspec || fwspec->ops != &arm_smmu_ops)
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
if (WARN_ON_ONCE(dev_iommu_priv_get(dev)))
- return -EBUSY;
+ return ERR_PTR(-EBUSY);
smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
if (!smmu)
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
master->dev = dev;
master->smmu = smmu;
@@ -2975,30 +2974,15 @@ static int arm_smmu_add_device(struct device *dev)
master->ssid_bits = min_t(u8, master->ssid_bits,
CTXDESC_LINEAR_CDMAX);
- ret = iommu_device_link(&smmu->iommu, dev);
- if (ret)
- goto err_disable_pasid;
+ return &smmu->iommu;
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- goto err_unlink;
- }
-
- iommu_group_put(group);
- return 0;
-
-err_unlink:
- iommu_device_unlink(&smmu->iommu, dev);
-err_disable_pasid:
- arm_smmu_disable_pasid(master);
err_free_master:
kfree(master);
dev_iommu_priv_set(dev, NULL);
- return ret;
+ return ERR_PTR(ret);
}
-static void arm_smmu_remove_device(struct device *dev)
+static void arm_smmu_release_device(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct arm_smmu_master *master;
@@ -3010,8 +2994,6 @@ static void arm_smmu_remove_device(struct device *dev)
master = dev_iommu_priv_get(dev);
smmu = master->smmu;
arm_smmu_detach_dev(master);
- iommu_group_remove_device(dev);
- iommu_device_unlink(&smmu->iommu, dev);
arm_smmu_disable_pasid(master);
kfree(master);
iommu_fwspec_free(dev);
@@ -3138,8 +3120,8 @@ static struct iommu_ops arm_smmu_ops = {
.flush_iotlb_all = arm_smmu_flush_iotlb_all,
.iotlb_sync = arm_smmu_iotlb_sync,
.iova_to_phys = arm_smmu_iova_to_phys,
- .add_device = arm_smmu_add_device,
- .remove_device = arm_smmu_remove_device,
+ .probe_device = arm_smmu_probe_device,
+ .release_device = arm_smmu_release_device,
.device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index a6a5796e9c41..e622f4e33379 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -220,7 +220,7 @@ static int arm_smmu_register_legacy_master(struct device *dev,
* With the legacy DT binding in play, we have no guarantees about
* probe order, but then we're also not doing default domains, so we can
* delay setting bus ops until we're sure every possible SMMU is ready,
- * and that way ensure that no add_device() calls get missed.
+ * and that way ensure that no probe_device() calls get missed.
*/
static int arm_smmu_legacy_bus_init(void)
{
@@ -1062,7 +1062,6 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
struct arm_smmu_device *smmu = cfg->smmu;
struct arm_smmu_smr *smrs = smmu->smrs;
- struct iommu_group *group;
int i, idx, ret;
mutex_lock(&smmu->stream_map_mutex);
@@ -1090,18 +1089,9 @@ static int arm_smmu_master_alloc_smes(struct device *dev)
cfg->smendx[i] = (s16)idx;
}
- group = iommu_group_get_for_dev(dev);
- if (IS_ERR(group)) {
- ret = PTR_ERR(group);
- goto out_err;
- }
- iommu_group_put(group);
-
/* It worked! Now, poke the actual hardware */
- for_each_cfg_sme(cfg, fwspec, i, idx) {
+ for_each_cfg_sme(cfg, fwspec, i, idx)
arm_smmu_write_sme(smmu, idx);
- smmu->s2crs[idx].group = group;
- }
mutex_unlock(&smmu->stream_map_mutex);
return 0;
@@ -1172,7 +1162,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
/*
* FIXME: The arch/arm DMA API code tries to attach devices to its own
- * domains between of_xlate() and add_device() - we have no way to cope
+ * domains between of_xlate() and probe_device() - we have no way to cope
* with that, so until ARM gets converted to rely on groups and default
* domains, just say no (but more politely than by dereferencing NULL).
* This should be at least a WARN_ON once that's sorted.
@@ -1382,7 +1372,7 @@ struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
return dev ? dev_get_drvdata(dev) : NULL;
}
-static int arm_smmu_add_device(struct device *dev)
+static struct iommu_device *arm_smmu_probe_device(struct device *dev)
{
struct arm_smmu_device *smmu = NULL;
struct arm_smmu_master_cfg *cfg;
@@ -1403,7 +1393,7 @@ static int arm_smmu_add_device(struct device *dev)
} else if (fwspec && fwspec->ops == &arm_smmu_ops) {
smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
} else {
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
}
ret = -EINVAL;
@@ -1444,21 +1434,19 @@ static int arm_smmu_add_device(struct device *dev)
if (ret)
goto out_cfg_free;
- iommu_device_link(&smmu->iommu, dev);
-
device_link_add(dev, smmu->dev,
DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
- return 0;
+ return &smmu->iommu;
out_cfg_free:
kfree(cfg);
out_free:
iommu_fwspec_free(dev);
- return ret;
+ return ERR_PTR(ret);
}
-static void arm_smmu_remove_device(struct device *dev)
+static void arm_smmu_release_device(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct arm_smmu_master_cfg *cfg;
@@ -1475,13 +1463,11 @@ static void arm_smmu_remove_device(struct device *dev)
if (ret < 0)
return;
- iommu_device_unlink(&smmu->iommu, dev);
arm_smmu_master_free_smes(cfg, fwspec);
arm_smmu_rpm_put(smmu);
dev_iommu_priv_set(dev, NULL);
- iommu_group_remove_device(dev);
kfree(cfg);
iommu_fwspec_free(dev);
}
@@ -1512,6 +1498,11 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev)
else
group = generic_device_group(dev);
+ /* Remember group for faster lookups */
+ if (!IS_ERR(group))
+ for_each_cfg_sme(cfg, fwspec, i, idx)
+ smmu->s2crs[idx].group = group;
+
return group;
}
@@ -1628,8 +1619,8 @@ static struct iommu_ops arm_smmu_ops = {
.flush_iotlb_all = arm_smmu_flush_iotlb_all,
.iotlb_sync = arm_smmu_iotlb_sync,
.iova_to_phys = arm_smmu_iova_to_phys,
- .add_device = arm_smmu_add_device,
- .remove_device = arm_smmu_remove_device,
+ .probe_device = arm_smmu_probe_device,
+ .release_device = arm_smmu_release_device,
.device_group = arm_smmu_device_group,
.domain_get_attr = arm_smmu_domain_get_attr,
.domain_set_attr = arm_smmu_domain_set_attr,
--
2.25.1
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