[PATCHv6 09/13] iommu/tegra: smmu: get swgroups from DT "iommus="
Hiroshi Doyu
hdoyu at nvidia.com
Thu Nov 21 08:40:45 EST 2013
This provides the info about which swgroups a device belongs to. This
info is passed from DT. This is necessary for the unified SMMU driver
among Tegra SoCs since each has different H/W accelerators.
Signed-off-by: Hiroshi Doyu <hdoyu at nvidia.com>
---
v6:
- Explained "#iommu-cells" in the binding document.
- Fixed old "nvidia,memory-clients" with 'iommus" in the binding
document.
- Move smmu_of_get_swgroups() here from the previous patch not to break
git bisecting.
v5:
"iommu=" in a device DT is used instead of "mmu-masters" in an iommu
DT. This is "iommu=" version of:
[PATCHv4 5/7] iommu/tegra: smmu: Support "mmu-masters" binding
---
.../bindings/iommu/nvidia,tegra30-smmu.txt | 30 ++++-
drivers/iommu/tegra-smmu.c | 133 ++++++++++++++++++---
2 files changed, 144 insertions(+), 19 deletions(-)
diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
index 89fb543..fd53f54 100644
--- a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
@@ -1,6 +1,6 @@
NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit)
-Required properties:
+Required properties in the IOMMU node:
- compatible : "nvidia,tegra30-smmu"
- reg : Should contain 3 register banks(address and length) for each
of the SMMU register blocks.
@@ -8,9 +8,23 @@ Required properties:
- nvidia,#asids : # of ASIDs
- dma-window : IOVA start address and length.
- nvidia,ahb : phandle to the ahb bus connected to SMMU.
+- iommus: phandle to an iommu device which a device is
+ attached to and indicates which swgroups a device belongs to(SWGROUP ID).
+ SWGROUP ID is from 0 to 63, and a device can belong to multiple SWGROUPS.
+- #iommu-cells. Should be 2. In client IOMMU specifiers, the two cells
+ represent a 64-bit bitmask of SWGROUP IDs under which the device
+ initiates transactions. The least significant word is first. See
+ <dt-bindings/memory/tegra-swgroup.h> for a list of valid values.
+
+Required properties in device nodes affected by the IOMMU:
+- iommus: A list of phandle plus specifier pairs for each IOMMU that
+ affects master transactions initiated by the device. The number of
+ cells in each specifier is defined by the #iommu-cells property in
+ the IOMMU node referred to by the phandle. The meaning of the
+ specifier cells is defined by the referenced IOMMU's binding.
Example:
- smmu {
+ smmu: iommu {
compatible = "nvidia,tegra30-smmu";
reg = <0x7000f010 0x02c
0x7000f1f0 0x010
@@ -18,4 +32,16 @@ Example:
nvidia,#asids = <4>; /* # of ASIDs */
dma-window = <0 0x40000000>; /* IOVA start & length */
nvidia,ahb = <&ahb>;
+ #iommu-cells = <2>;
};
+
+ host1x {
+ compatible = "nvidia,tegra30-host1x", "simple-bus";
+ iommus = <&smmu TEGRA_SWGROUP_CELLS(HC)>;
+ ....
+ gr3d {
+ compatible = "nvidia,tegra30-gr3d";
+ iommus = <&smmu TEGRA_SWGROUP_CELLS(NV)
+ TEGRA_SWGROUP_CELLS(NV2)>;
+ ....
+ };
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 6ab977a..1a1bcdf 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -190,6 +190,8 @@ enum {
* Per client for address space
*/
struct smmu_client {
+ struct device_node *of_node;
+ struct rb_node node;
struct device *dev;
struct list_head list;
struct smmu_as *as;
@@ -233,6 +235,7 @@ struct smmu_device {
spinlock_t lock;
char *name;
struct device *dev;
+ struct rb_root clients;
struct page *avp_vector_page; /* dummy page shared by all AS's */
/*
@@ -310,6 +313,96 @@ static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs)
*/
#define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_CONFIG)
+static struct smmu_client *find_smmu_client(struct smmu_device *smmu,
+ struct device_node *dev_node)
+{
+ struct rb_node *node = smmu->clients.rb_node;
+
+ while (node) {
+ struct smmu_client *client;
+
+ client = container_of(node, struct smmu_client, node);
+ if (dev_node < client->of_node)
+ node = node->rb_left;
+ else if (dev_node > client->of_node)
+ node = node->rb_right;
+ else
+ return client;
+ }
+
+ return NULL;
+}
+
+static int insert_smmu_client(struct smmu_device *smmu,
+ struct smmu_client *client)
+{
+ struct rb_node **new, *parent;
+
+ new = &smmu->clients.rb_node;
+ parent = NULL;
+ while (*new) {
+ struct smmu_client *this;
+ this = container_of(*new, struct smmu_client, node);
+
+ parent = *new;
+ if (client->of_node < this->of_node)
+ new = &((*new)->rb_left);
+ else if (client->of_node > this->of_node)
+ new = &((*new)->rb_right);
+ else
+ return -EEXIST;
+ }
+
+ rb_link_node(&client->node, parent, new);
+ rb_insert_color(&client->node, &smmu->clients);
+ return 0;
+}
+
+static int register_smmu_client(struct smmu_device *smmu,
+ struct device *dev, unsigned long *swgroups)
+{
+ struct smmu_client *client;
+
+ client = find_smmu_client(smmu, dev->of_node);
+ if (client) {
+ dev_err(dev,
+ "rejecting multiple registrations for client device %s\n",
+ dev->of_node->full_name);
+ return -EBUSY;
+ }
+
+ client = devm_kzalloc(smmu->dev, sizeof(*client), GFP_KERNEL);
+ if (!client)
+ return -ENOMEM;
+
+ client->dev = dev;
+ client->of_node = dev->of_node;
+ memcpy(client->hwgrp, swgroups, sizeof(u64));
+ return insert_smmu_client(smmu, client);
+}
+
+static int smmu_of_get_swgroups(struct device *dev, unsigned long *swgroups)
+{
+ int i;
+ struct of_phandle_args args;
+
+ of_property_for_each_phandle_with_args(dev->of_node, "iommus",
+ "#iommu-cells", i, &args) {
+ if (args.np != smmu_handle->dev->of_node)
+ continue;
+
+ BUG_ON(args.args_count != 2);
+
+ memcpy(swgroups, args.args, sizeof(u64));
+ pr_debug("swgroups=%08lx %08lx ops=%p %s\n",
+ swgroups[0], swgroups[1],
+ dev->bus->iommu_ops, dev_name(dev));
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
static int __smmu_client_set_hwgrp(struct smmu_client *c,
unsigned long *map, int on)
{
@@ -719,21 +812,16 @@ static int smmu_iommu_attach_dev(struct iommu_domain *domain,
struct smmu_as *as = domain->priv;
struct smmu_device *smmu = as->smmu;
struct smmu_client *client, *c;
- unsigned long *map;
int err;
- client = devm_kzalloc(smmu->dev, sizeof(*c), GFP_KERNEL);
+ client = find_smmu_client(smmu, dev->of_node);
if (!client)
return -ENOMEM;
- client->dev = dev;
- client->as = as;
- map = (unsigned long *)dev->platform_data;
- if (!map)
- return -EINVAL;
- err = smmu_client_enable_hwgrp(client, map);
+ client->as = as;
+ err = smmu_client_enable_hwgrp(client, client->hwgrp);
if (err)
- goto err_hwgrp;
+ return -EINVAL;
spin_lock(&as->client_lock);
list_for_each_entry(c, &as->client, list) {
@@ -751,7 +839,7 @@ static int smmu_iommu_attach_dev(struct iommu_domain *domain,
* Reserve "page zero" for AVP vectors using a common dummy
* page.
*/
- if (test_bit(TEGRA_SWGROUP_AVPC, map)) {
+ if (test_bit(TEGRA_SWGROUP_AVPC, client->hwgrp)) {
struct page *page;
page = as->smmu->avp_vector_page;
@@ -766,8 +854,6 @@ static int smmu_iommu_attach_dev(struct iommu_domain *domain,
err_client:
smmu_client_disable_hwgrp(client);
spin_unlock(&as->client_lock);
-err_hwgrp:
- devm_kfree(smmu->dev, client);
return err;
}
@@ -784,7 +870,6 @@ static void smmu_iommu_detach_dev(struct iommu_domain *domain,
if (c->dev == dev) {
smmu_client_disable_hwgrp(c);
list_del(&c->list);
- devm_kfree(smmu->dev, c);
c->as = NULL;
dev_dbg(smmu->dev,
"%s is detached\n", dev_name(c->dev));
@@ -888,10 +973,23 @@ enum {
static int smmu_iommu_bound_driver(struct device *dev)
{
- int err = -EPROBE_DEFER;
- u32 swgroups = dev->platform_data;
+ int err;
+ unsigned long swgroups[2];
struct dma_iommu_mapping *map = NULL;
+ err = smmu_of_get_swgroups(dev, swgroups);
+ if (err)
+ return -ENODEV;
+
+ if (!find_smmu_client(smmu_handle, dev->of_node)) {
+ err = register_smmu_client(smmu_handle, dev, swgroups);
+ if (err) {
+ dev_err(dev, "failed to add client %s\n",
+ dev_name(dev));
+ return -EINVAL;
+ }
+ }
+
if (test_bit(TEGRA_SWGROUP_PPCS, swgroups))
map = smmu_handle->map[SYSTEM_PROTECTED];
else
@@ -902,8 +1000,8 @@ static int smmu_iommu_bound_driver(struct device *dev)
else
return -EPROBE_DEFER;
- pr_debug("swgroups=%08lx map=%p err=%d %s\n",
- swgroups, map, err, dev_name(dev));
+ pr_debug("swgroups=%08lx %08lx map=%p err=%d %s\n",
+ swgroups[0], swgroups[1], map, err, dev_name(dev));
return err;
}
@@ -1156,6 +1254,7 @@ static int tegra_smmu_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ smmu->clients = RB_ROOT;
smmu->map = (struct dma_iommu_mapping **)(smmu->as + asids);
smmu->nregs = pdev->num_resources;
smmu->regs = devm_kzalloc(dev, 2 * smmu->nregs * sizeof(*smmu->regs),
--
1.8.1.5
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