@@ -2,6 +2,7 @@
* omap iommu: tlb and pagetable primitives
*
* Copyright (C) 2008-2010 Nokia Corporation
+ * Copyright (C) 2013-2017 Texas Instruments Incorporated - http://www.ti.com/
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
* Paul Mundt and Toshihiro Kobayashi
@@ -71,13 +72,23 @@ static struct omap_iommu_domain *to_omap_domain(struct iommu_domain *dom)
**/
void omap_iommu_save_ctx(struct device *dev)
{
- struct omap_iommu *obj = dev_to_omap_iommu(dev);
- u32 *p = obj->ctx;
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ struct omap_iommu *obj;
+ u32 *p;
int i;
- for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
- p[i] = iommu_read_reg(obj, i * sizeof(u32));
- dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]);
+ if (!arch_data)
+ return;
+
+ while (arch_data->iommu_dev) {
+ obj = arch_data->iommu_dev;
+ p = obj->ctx;
+ for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
+ p[i] = iommu_read_reg(obj, i * sizeof(u32));
+ dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i,
+ p[i]);
+ }
+ arch_data++;
}
}
EXPORT_SYMBOL_GPL(omap_iommu_save_ctx);
@@ -88,13 +99,23 @@ EXPORT_SYMBOL_GPL(omap_iommu_save_ctx);
**/
void omap_iommu_restore_ctx(struct device *dev)
{
- struct omap_iommu *obj = dev_to_omap_iommu(dev);
- u32 *p = obj->ctx;
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ struct omap_iommu *obj;
+ u32 *p;
int i;
- for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
- iommu_write_reg(obj, p[i], i * sizeof(u32));
- dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i, p[i]);
+ if (!arch_data)
+ return;
+
+ while (arch_data->iommu_dev) {
+ obj = arch_data->iommu_dev;
+ p = obj->ctx;
+ for (i = 0; i < (MMU_REG_SIZE / sizeof(u32)); i++) {
+ iommu_write_reg(obj, p[i], i * sizeof(u32));
+ dev_dbg(obj->dev, "%s\t[%02d] %08x\n", __func__, i,
+ p[i]);
+ }
+ arch_data++;
}
}
EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx);
@@ -893,6 +914,24 @@ static void omap_iommu_detach(struct omap_iommu *obj)
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
}
+static bool omap_iommu_can_register(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+
+ if (!of_device_is_compatible(np, "ti,dra7-dsp-iommu"))
+ return true;
+
+ /*
+ * restrict IOMMU core registration only for processor-port MDMA MMUs
+ * on DRA7 DSPs
+ */
+ if ((!strcmp(dev_name(&pdev->dev), "40d01000.mmu")) ||
+ (!strcmp(dev_name(&pdev->dev), "41501000.mmu")))
+ return true;
+
+ return false;
+}
+
static int omap_iommu_dra7_get_dsp_system_cfg(struct platform_device *pdev,
struct omap_iommu *obj)
{
@@ -984,19 +1023,22 @@ static int omap_iommu_probe(struct platform_device *pdev)
return err;
platform_set_drvdata(pdev, obj);
- obj->group = iommu_group_alloc();
- if (IS_ERR(obj->group))
- return PTR_ERR(obj->group);
+ if (omap_iommu_can_register(pdev)) {
+ obj->group = iommu_group_alloc();
+ if (IS_ERR(obj->group))
+ return PTR_ERR(obj->group);
- err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL, obj->name);
- if (err)
- goto out_group;
+ err = iommu_device_sysfs_add(&obj->iommu, obj->dev, NULL,
+ obj->name);
+ if (err)
+ goto out_group;
- iommu_device_set_ops(&obj->iommu, &omap_iommu_ops);
+ iommu_device_set_ops(&obj->iommu, &omap_iommu_ops);
- err = iommu_device_register(&obj->iommu);
- if (err)
- goto out_sysfs;
+ err = iommu_device_register(&obj->iommu);
+ if (err)
+ goto out_sysfs;
+ }
pm_runtime_irq_safe(obj->dev);
pm_runtime_enable(obj->dev);
@@ -1018,11 +1060,13 @@ static int omap_iommu_remove(struct platform_device *pdev)
{
struct omap_iommu *obj = platform_get_drvdata(pdev);
- iommu_group_put(obj->group);
- obj->group = NULL;
+ if (obj->group) {
+ iommu_group_put(obj->group);
+ obj->group = NULL;
- iommu_device_sysfs_remove(&obj->iommu);
- iommu_device_unregister(&obj->iommu);
+ iommu_device_sysfs_remove(&obj->iommu);
+ iommu_device_unregister(&obj->iommu);
+ }
omap_iommu_debugfs_remove(obj);
@@ -1068,11 +1112,13 @@ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
phys_addr_t pa, size_t bytes, int prot)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
- struct omap_iommu *oiommu = omap_domain->iommu_dev;
- struct device *dev = oiommu->dev;
+ struct device *dev = omap_domain->dev;
+ struct omap_iommu_device *iommu;
+ struct omap_iommu *oiommu;
struct iotlb_entry e;
int omap_pgsz;
- u32 ret;
+ u32 ret = -EINVAL;
+ int i;
omap_pgsz = bytes_to_iopgsz(bytes);
if (omap_pgsz < 0) {
@@ -1084,9 +1130,24 @@ static int omap_iommu_map(struct iommu_domain *domain, unsigned long da,
iotlb_init_entry(&e, da, pa, omap_pgsz);
- ret = omap_iopgtable_store_entry(oiommu, &e);
- if (ret)
- dev_err(dev, "omap_iopgtable_store_entry failed: %d\n", ret);
+ iommu = omap_domain->iommus;
+ for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
+ oiommu = iommu->iommu_dev;
+ ret = omap_iopgtable_store_entry(oiommu, &e);
+ if (ret) {
+ dev_err(dev, "omap_iopgtable_store_entry failed: %d\n",
+ ret);
+ break;
+ }
+ }
+
+ if (ret) {
+ while (i--) {
+ iommu--;
+ oiommu = iommu->iommu_dev;
+ iopgtable_clear_entry(oiommu, da);
+ }
+ }
return ret;
}
@@ -1095,12 +1156,90 @@ static size_t omap_iommu_unmap(struct iommu_domain *domain, unsigned long da,
size_t size)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
- struct omap_iommu *oiommu = omap_domain->iommu_dev;
- struct device *dev = oiommu->dev;
+ struct device *dev = omap_domain->dev;
+ struct omap_iommu_device *iommu;
+ struct omap_iommu *oiommu;
+ bool error = false;
+ size_t bytes = 0;
+ int i;
dev_dbg(dev, "unmapping da 0x%lx size %u\n", da, size);
- return iopgtable_clear_entry(oiommu, da);
+ iommu = omap_domain->iommus;
+ for (i = 0; i < omap_domain->num_iommus; i++, iommu++) {
+ oiommu = iommu->iommu_dev;
+ bytes = iopgtable_clear_entry(oiommu, da);
+ if (!bytes)
+ error = true;
+ }
+
+ /*
+ * simplify return - we are only checking if any of the iommus
+ * reported an error, but not if all of them are unmapping the
+ * same number of entries. This should not occur due to the
+ * mirror programming.
+ */
+ return error ? 0 : bytes;
+}
+
+static int omap_iommu_count(struct device *dev)
+{
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ int count = 0;
+
+ while (arch_data->iommu_dev) {
+ count++;
+ arch_data++;
+ }
+
+ return count;
+}
+
+/* caller should call cleanup if this function fails */
+static int omap_iommu_attach_init(struct device *dev,
+ struct omap_iommu_domain *odomain)
+{
+ struct omap_iommu_device *iommu;
+ int i;
+
+ odomain->num_iommus = omap_iommu_count(dev);
+ if (!odomain->num_iommus)
+ return -EINVAL;
+
+ odomain->iommus = kcalloc(odomain->num_iommus, sizeof(*iommu),
+ GFP_ATOMIC);
+ if (!odomain->iommus)
+ return -ENOMEM;
+
+ iommu = odomain->iommus;
+ for (i = 0; i < odomain->num_iommus; i++, iommu++) {
+ iommu->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_ATOMIC);
+ if (!iommu->pgtable)
+ return -ENOMEM;
+
+ /*
+ * should never fail, but please keep this around to ensure
+ * we keep the hardware happy
+ */
+ if (WARN_ON(!IS_ALIGNED((long)iommu->pgtable,
+ IOPGD_TABLE_SIZE)))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void omap_iommu_detach_fini(struct omap_iommu_domain *odomain)
+{
+ int i;
+ struct omap_iommu_device *iommu = odomain->iommus;
+
+ for (i = 0; iommu && i < odomain->num_iommus; i++, iommu++)
+ kfree(iommu->pgtable);
+
+ kfree(odomain->iommus);
+ odomain->num_iommus = 0;
+ odomain->iommus = NULL;
}
static int
@@ -1108,8 +1247,10 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ struct omap_iommu_device *iommu;
struct omap_iommu *oiommu;
int ret = 0;
+ int i;
if (!arch_data || !arch_data->iommu_dev) {
dev_err(dev, "device doesn't have an associated iommu\n");
@@ -1125,19 +1266,42 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
goto out;
}
- oiommu = arch_data->iommu_dev;
-
- /* get a handle to and enable the omap iommu */
- ret = omap_iommu_attach(oiommu, omap_domain->pgtable);
+ ret = omap_iommu_attach_init(dev, omap_domain);
if (ret) {
- dev_err(dev, "can't get omap iommu: %d\n", ret);
- goto out;
+ dev_err(dev, "failed to allocate required iommu data %d\n",
+ ret);
+ goto init_fail;
+ }
+
+ iommu = omap_domain->iommus;
+ for (i = 0; i < omap_domain->num_iommus; i++, iommu++, arch_data++) {
+ /* configure and enable the omap iommu */
+ oiommu = arch_data->iommu_dev;
+ ret = omap_iommu_attach(oiommu, iommu->pgtable);
+ if (ret) {
+ dev_err(dev, "can't get omap iommu: %d\n", ret);
+ goto attach_fail;
+ }
+
+ oiommu->domain = domain;
+ iommu->iommu_dev = oiommu;
}
- omap_domain->iommu_dev = oiommu;
omap_domain->dev = dev;
- oiommu->domain = domain;
+ goto out;
+
+attach_fail:
+ while (i--) {
+ iommu--;
+ arch_data--;
+ oiommu = iommu->iommu_dev;
+ omap_iommu_detach(oiommu);
+ iommu->iommu_dev = NULL;
+ oiommu->domain = NULL;
+ }
+init_fail:
+ omap_iommu_detach_fini(omap_domain);
out:
spin_unlock(&omap_domain->lock);
return ret;
@@ -1146,7 +1310,10 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain,
struct device *dev)
{
- struct omap_iommu *oiommu = dev_to_omap_iommu(dev);
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ struct omap_iommu_device *iommu = omap_domain->iommus;
+ struct omap_iommu *oiommu;
+ int i;
if (!omap_domain->dev) {
dev_err(dev, "domain has no attached device\n");
@@ -1159,13 +1326,24 @@ static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain,
return;
}
- iopgtable_clear_entry_all(oiommu);
+ /*
+ * cleanup in the reverse order of attachment - this addresses
+ * any h/w dependencies between multiple instances, if any
+ */
+ iommu += (omap_domain->num_iommus - 1);
+ arch_data += (omap_domain->num_iommus - 1);
+ for (i = 0; i < omap_domain->num_iommus; i++, iommu--, arch_data--) {
+ oiommu = iommu->iommu_dev;
+ iopgtable_clear_entry_all(oiommu);
+
+ omap_iommu_detach(oiommu);
+ iommu->iommu_dev = NULL;
+ oiommu->domain = NULL;
+ }
- omap_iommu_detach(oiommu);
+ omap_iommu_detach_fini(omap_domain);
- omap_domain->iommu_dev = NULL;
omap_domain->dev = NULL;
- oiommu->domain = NULL;
}
static void omap_iommu_detach_dev(struct iommu_domain *domain,
@@ -1187,18 +1365,7 @@ static struct iommu_domain *omap_iommu_domain_alloc(unsigned type)
omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL);
if (!omap_domain)
- goto out;
-
- omap_domain->pgtable = kzalloc(IOPGD_TABLE_SIZE, GFP_KERNEL);
- if (!omap_domain->pgtable)
- goto fail_nomem;
-
- /*
- * should never fail, but please keep this around to ensure
- * we keep the hardware happy
- */
- if (WARN_ON(!IS_ALIGNED((long)omap_domain->pgtable, IOPGD_TABLE_SIZE)))
- goto fail_align;
+ return NULL;
spin_lock_init(&omap_domain->lock);
@@ -1207,13 +1374,6 @@ static struct iommu_domain *omap_iommu_domain_alloc(unsigned type)
omap_domain->domain.geometry.force_aperture = true;
return &omap_domain->domain;
-
-fail_align:
- kfree(omap_domain->pgtable);
-fail_nomem:
- kfree(omap_domain);
-out:
- return NULL;
}
static void omap_iommu_domain_free(struct iommu_domain *domain)
@@ -1227,7 +1387,6 @@ static void omap_iommu_domain_free(struct iommu_domain *domain)
if (omap_domain->dev)
_omap_iommu_detach_dev(omap_domain, omap_domain->dev);
- kfree(omap_domain->pgtable);
kfree(omap_domain);
}
@@ -1235,11 +1394,16 @@ static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t da)
{
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
- struct omap_iommu *oiommu = omap_domain->iommu_dev;
+ struct omap_iommu_device *iommu = omap_domain->iommus;
+ struct omap_iommu *oiommu = iommu->iommu_dev;
struct device *dev = oiommu->dev;
u32 *pgd, *pte;
phys_addr_t ret = 0;
+ /*
+ * all the iommus within the domain will have identical programming,
+ * so perform the lookup using just the first iommu
+ */
iopgtable_lookup_entry(oiommu, da, &pgd, &pte);
if (pte) {
@@ -1265,11 +1429,12 @@ static phys_addr_t omap_iommu_iova_to_phys(struct iommu_domain *domain,
static int omap_iommu_add_device(struct device *dev)
{
- struct omap_iommu_arch_data *arch_data;
+ struct omap_iommu_arch_data *arch_data, *tmp;
struct omap_iommu *oiommu;
struct iommu_group *group;
struct device_node *np;
struct platform_device *pdev;
+ int num_iommus, i;
int ret;
/*
@@ -1281,36 +1446,57 @@ static int omap_iommu_add_device(struct device *dev)
if (!dev->of_node)
return 0;
- np = of_parse_phandle(dev->of_node, "iommus", 0);
- if (!np)
+ /*
+ * retrieve the count of IOMMU nodes using phandle size as element size
+ * since #iommu-cells = 0 for OMAP
+ */
+ num_iommus = of_property_count_elems_of_size(dev->of_node, "iommus",
+ sizeof(phandle));
+ if (num_iommus < 0)
return 0;
- pdev = of_find_device_by_node(np);
- if (WARN_ON(!pdev)) {
- of_node_put(np);
- return -EINVAL;
- }
+ arch_data = kzalloc((num_iommus + 1) * sizeof(*arch_data), GFP_KERNEL);
+ if (!arch_data)
+ return -ENOMEM;
- oiommu = platform_get_drvdata(pdev);
- if (!oiommu) {
- of_node_put(np);
- return -EINVAL;
- }
+ for (i = 0, tmp = arch_data; i < num_iommus; i++, tmp++) {
+ np = of_parse_phandle(dev->of_node, "iommus", i);
+ if (!np) {
+ kfree(arch_data);
+ return -EINVAL;
+ }
+
+ pdev = of_find_device_by_node(np);
+ if (WARN_ON(!pdev)) {
+ of_node_put(np);
+ kfree(arch_data);
+ return -EINVAL;
+ }
+
+ oiommu = platform_get_drvdata(pdev);
+ if (!oiommu) {
+ of_node_put(np);
+ kfree(arch_data);
+ return -EINVAL;
+ }
+
+ tmp->iommu_dev = oiommu;
- arch_data = kzalloc(sizeof(*arch_data), GFP_KERNEL);
- if (!arch_data) {
of_node_put(np);
- return -ENOMEM;
}
+ /*
+ * use the first IOMMU alone for the sysfs device linking.
+ * TODO: Evaluate if a single iommu_group needs to be
+ * maintained for both IOMMUs
+ */
+ oiommu = arch_data->iommu_dev;
ret = iommu_device_link(&oiommu->iommu, dev);
if (ret) {
kfree(arch_data);
- of_node_put(np);
return ret;
}
- arch_data->iommu_dev = oiommu;
dev->archdata.iommu = arch_data;
/*
@@ -1326,8 +1512,6 @@ static int omap_iommu_add_device(struct device *dev)
}
iommu_group_put(group);
- of_node_put(np);
-
return 0;
}
@@ -29,17 +29,26 @@ struct iotlb_entry {
};
/**
+ * struct omap_iommu_device - omap iommu device data
+ * @pgtable: page table used by an omap iommu attached to a domain
+ * @iommu_dev: pointer to store an omap iommu instance attached to a domain
+ */
+struct omap_iommu_device {
+ u32 *pgtable;
+ struct omap_iommu *iommu_dev;
+};
+
+/**
* struct omap_iommu_domain - omap iommu domain
- * @pgtable: the page table
- * @iommu_dev: an omap iommu device attached to this domain. only a single
- * iommu device can be attached for now.
+ * @num_iommus: number of iommus in this domain
+ * @iommus: omap iommu device data for all iommus in this domain
* @dev: Device using this domain.
* @lock: domain lock, should be taken when attaching/detaching
* @domain: generic domain handle used by iommu core code
*/
struct omap_iommu_domain {
- u32 *pgtable;
- struct omap_iommu *iommu_dev;
+ u32 num_iommus;
+ struct omap_iommu_device *iommus;
struct device *dev;
spinlock_t lock;
struct iommu_domain domain;
@@ -97,17 +106,6 @@ struct iotlb_lock {
short vict;
};
-/**
- * dev_to_omap_iommu() - retrieves an omap iommu object from a user device
- * @dev: iommu client device
- */
-static inline struct omap_iommu *dev_to_omap_iommu(struct device *dev)
-{
- struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
-
- return arch_data->iommu_dev;
-}
-
/*
* MMU Register offsets
*/