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Date: Tue, 15 Dec 2015 22:05:27 +0900
From: Magnus Damm <magnus.damm@...il.com>
To: iommu@...ts.linux-foundation.org
Cc: laurent.pinchart+renesas@...asonboard.com, geert+renesas@...der.be,
linux-sh@...r.kernel.org, joro@...tes.org,
linux-kernel@...r.kernel.org, horms+renesas@...ge.net.au,
Magnus Damm <magnus.damm@...il.com>
Subject: [PATCH/RFC 02/10] iommu/ipmmu-vmsa: Add optional root device feature
From: Magnus Damm <damm+renesas@...nsource.se>
Add root device handling to the IPMMU driver by
allowing certain DT compat strings to enable
had_cache_leaf_nodes that in turn will support
both root devices with interrupts and leaf devices
that face the actual IPMMU consumer devices.
Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
---
drivers/iommu/ipmmu-vmsa.c | 86 +++++++++++++++++++++++++++++++++++---------
1 file changed, 69 insertions(+), 17 deletions(-)
--- 0010/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c 2015-12-15 21:13:00.440513000 +0900
@@ -33,6 +33,7 @@
struct ipmmu_features {
bool use_ns_alias_offset;
+ bool has_cache_leaf_nodes;
};
struct ipmmu_vmsa_device {
@@ -48,10 +49,12 @@ struct ipmmu_vmsa_device {
struct dma_iommu_mapping *mapping;
#endif
const struct ipmmu_features *features;
+ bool is_leaf;
};
struct ipmmu_vmsa_domain {
struct ipmmu_vmsa_device *mmu;
+ struct ipmmu_vmsa_device *root;
struct iommu_domain io_domain;
struct io_pgtable_cfg cfg;
@@ -210,6 +213,36 @@ static void set_dev_data(struct device *
}
/* -----------------------------------------------------------------------------
+ * Root device handling
+ */
+
+static bool ipmmu_is_root(struct ipmmu_vmsa_device *mmu)
+{
+ if (mmu->features->has_cache_leaf_nodes)
+ return mmu->is_leaf ? false : true;
+ else
+ return true; /* older IPMMU hardware treated as single root */
+}
+
+static struct ipmmu_vmsa_device *ipmmu_find_root(struct ipmmu_vmsa_device *leaf)
+{
+ struct ipmmu_vmsa_device *mmu;
+
+ if (ipmmu_is_root(leaf))
+ return leaf;
+
+ spin_lock(&ipmmu_devices_lock);
+
+ list_for_each_entry(mmu, &ipmmu_devices, list) {
+ if (ipmmu_is_root(mmu))
+ break;
+ }
+
+ spin_unlock(&ipmmu_devices_lock);
+ return mmu;
+}
+
+/* -----------------------------------------------------------------------------
* Read/Write Access
*/
@@ -226,13 +259,13 @@ static void ipmmu_write(struct ipmmu_vms
static u32 ipmmu_ctx_read(struct ipmmu_vmsa_domain *domain, unsigned int reg)
{
- return ipmmu_read(domain->mmu, domain->context_id * IM_CTX_SIZE + reg);
+ return ipmmu_read(domain->root, domain->context_id * IM_CTX_SIZE + reg);
}
static void ipmmu_ctx_write(struct ipmmu_vmsa_domain *domain, unsigned int reg,
u32 data)
{
- ipmmu_write(domain->mmu, domain->context_id * IM_CTX_SIZE + reg, data);
+ ipmmu_write(domain->root, domain->context_id * IM_CTX_SIZE + reg, data);
}
/* -----------------------------------------------------------------------------
@@ -355,7 +388,7 @@ static int ipmmu_domain_init_context(str
* TODO: Add support for coherent walk through CCI with DVM and remove
* cache handling. For now, delegate it to the io-pgtable code.
*/
- domain->cfg.iommu_dev = domain->mmu->dev;
+ domain->cfg.iommu_dev = domain->root->dev;
domain->iop = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &domain->cfg,
domain);
@@ -365,14 +398,14 @@ static int ipmmu_domain_init_context(str
/*
* Find an unused context.
*/
- ret = bitmap_find_free_region(domain->mmu->ctx, IPMMU_CTX_MAX, 0);
+ ret = bitmap_find_free_region(domain->root->ctx, IPMMU_CTX_MAX, 0);
if (ret < 0) {
free_io_pgtable_ops(domain->iop);
return ret;
}
domain->context_id = ret;
- domain->mmu->domains[ret] = domain;
+ domain->root->domains[ret] = domain;
/* TTBR0 */
ttbr = domain->cfg.arm_lpae_s1_cfg.ttbr[0];
@@ -532,7 +565,7 @@ static int ipmmu_attach_device(struct io
struct device *dev)
{
struct ipmmu_vmsa_dev_data *dev_data = get_dev_data(dev);
- struct ipmmu_vmsa_device *mmu = dev_data->mmu;
+ struct ipmmu_vmsa_device *root, *mmu = dev_data->mmu;
struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
unsigned long flags;
int ret = 0;
@@ -542,11 +575,18 @@ static int ipmmu_attach_device(struct io
return -ENXIO;
}
+ root = ipmmu_find_root(dev_data->mmu);
+ if (!root) {
+ dev_err(dev, "Unable to locate root IPMMU\n");
+ return -EAGAIN;
+ }
+
spin_lock_irqsave(&domain->lock, flags);
if (!domain->mmu) {
/* The domain hasn't been used yet, initialize it. */
domain->mmu = mmu;
+ domain->root = root;
ret = ipmmu_domain_init_context(domain);
} else if (domain->mmu != mmu) {
/*
@@ -824,6 +864,7 @@ static void ipmmu_device_reset(struct ip
static const struct ipmmu_features ipmmu_features_default = {
.use_ns_alias_offset = true,
+ .has_cache_leaf_nodes = false,
};
static const struct of_device_id ipmmu_of_ids[] = {
@@ -882,19 +923,30 @@ static int ipmmu_probe(struct platform_d
mmu->base += IM_NS_ALIAS_OFFSET;
irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_err(&pdev->dev, "no IRQ found\n");
- return irq;
- }
- ret = devm_request_irq(&pdev->dev, irq, ipmmu_irq, 0,
- dev_name(&pdev->dev), mmu);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to request IRQ %d\n", irq);
- return ret;
- }
+ /*
+ * Determine if this IPMMU instance is a leaf device by checking
+ * if an interrupt is availabile or not
+ */
+ if (mmu->features->has_cache_leaf_nodes && irq < 0)
+ mmu->is_leaf = true;
+
+ /* Root devices have mandatory IRQs */
+ if (ipmmu_is_root(mmu)) {
+ if (irq < 0) {
+ dev_err(&pdev->dev, "no IRQ found\n");
+ return irq;
+ }
- ipmmu_device_reset(mmu);
+ ret = devm_request_irq(&pdev->dev, irq, ipmmu_irq, 0,
+ dev_name(&pdev->dev), mmu);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to request IRQ %d\n", irq);
+ return ret;
+ }
+
+ ipmmu_device_reset(mmu);
+ }
/*
* We can't create the ARM mapping here as it requires the bus to have
--
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