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path: root/drivers/of/of_reserved_mem.c
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Diffstat (limited to 'drivers/of/of_reserved_mem.c')
-rw-r--r--drivers/of/of_reserved_mem.c105
1 files changed, 74 insertions, 31 deletions
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 216648233..366d8c3c7 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -13,6 +13,8 @@
* License or (at your optional) any later version of the license.
*/
+#define pr_fmt(fmt) "OF: reserved mem: " fmt
+
#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
@@ -21,6 +23,7 @@
#include <linux/sizes.h>
#include <linux/of_reserved_mem.h>
#include <linux/sort.h>
+#include <linux/slab.h>
#define MAX_RESERVED_REGIONS 16
static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
@@ -75,7 +78,7 @@ void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
- pr_err("Reserved memory: not enough space all defined regions.\n");
+ pr_err("not enough space all defined regions.\n");
return;
}
@@ -108,8 +111,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
return -EINVAL;
if (len != dt_root_size_cells * sizeof(__be32)) {
- pr_err("Reserved memory: invalid size property in '%s' node.\n",
- uname);
+ pr_err("invalid size property in '%s' node.\n", uname);
return -EINVAL;
}
size = dt_mem_next_cell(dt_root_size_cells, &prop);
@@ -119,7 +121,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
prop = of_get_flat_dt_prop(node, "alignment", &len);
if (prop) {
if (len != dt_root_addr_cells * sizeof(__be32)) {
- pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
+ pr_err("invalid alignment property in '%s' node.\n",
uname);
return -EINVAL;
}
@@ -141,7 +143,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
if (prop) {
if (len % t_len != 0) {
- pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
+ pr_err("invalid alloc-ranges property in '%s', skipping node.\n",
uname);
return -EINVAL;
}
@@ -156,7 +158,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
ret = early_init_dt_alloc_reserved_memory_arch(size,
align, start, end, nomap, &base);
if (ret == 0) {
- pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
+ pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n",
uname, &base,
(unsigned long)size / SZ_1M);
break;
@@ -168,13 +170,12 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
ret = early_init_dt_alloc_reserved_memory_arch(size, align,
0, 0, nomap, &base);
if (ret == 0)
- pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
+ pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n",
uname, &base, (unsigned long)size / SZ_1M);
}
if (base == 0) {
- pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
- uname);
+ pr_info("failed to allocate memory for node '%s'\n", uname);
return -ENOMEM;
}
@@ -203,7 +204,7 @@ static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
continue;
if (initfn(rmem) == 0) {
- pr_info("Reserved memory: initialized node %s, compatible id %s\n",
+ pr_info("initialized node %s, compatible id %s\n",
rmem->name, compat);
return 0;
}
@@ -245,7 +246,7 @@ static void __init __rmem_check_for_overlap(void)
this_end = this->base + this->size;
next_end = next->base + next->size;
- pr_err("Reserved memory: OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
+ pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
this->name, &this->base, &this_end,
next->name, &next->base, &next_end);
}
@@ -296,53 +297,95 @@ static inline struct reserved_mem *__find_rmem(struct device_node *node)
return NULL;
}
+struct rmem_assigned_device {
+ struct device *dev;
+ struct reserved_mem *rmem;
+ struct list_head list;
+};
+
+static LIST_HEAD(of_rmem_assigned_device_list);
+static DEFINE_MUTEX(of_rmem_assigned_device_mutex);
+
/**
- * of_reserved_mem_device_init() - assign reserved memory region to given device
+ * of_reserved_mem_device_init_by_idx() - assign reserved memory region to
+ * given device
+ * @dev: Pointer to the device to configure
+ * @np: Pointer to the device_node with 'reserved-memory' property
+ * @idx: Index of selected region
*
- * This function assign memory region pointed by "memory-region" device tree
- * property to the given device.
+ * This function assigns respective DMA-mapping operations based on reserved
+ * memory region specified by 'memory-region' property in @np node to the @dev
+ * device. When driver needs to use more than one reserved memory region, it
+ * should allocate child devices and initialize regions by name for each of
+ * child device.
+ *
+ * Returns error code or zero on success.
*/
-int of_reserved_mem_device_init(struct device *dev)
+int of_reserved_mem_device_init_by_idx(struct device *dev,
+ struct device_node *np, int idx)
{
+ struct rmem_assigned_device *rd;
+ struct device_node *target;
struct reserved_mem *rmem;
- struct device_node *np;
int ret;
- np = of_parse_phandle(dev->of_node, "memory-region", 0);
- if (!np)
+ if (!np || !dev)
+ return -EINVAL;
+
+ target = of_parse_phandle(np, "memory-region", idx);
+ if (!target)
return -ENODEV;
- rmem = __find_rmem(np);
- of_node_put(np);
+ rmem = __find_rmem(target);
+ of_node_put(target);
if (!rmem || !rmem->ops || !rmem->ops->device_init)
return -EINVAL;
+ rd = kmalloc(sizeof(struct rmem_assigned_device), GFP_KERNEL);
+ if (!rd)
+ return -ENOMEM;
+
ret = rmem->ops->device_init(rmem, dev);
- if (ret == 0)
+ if (ret == 0) {
+ rd->dev = dev;
+ rd->rmem = rmem;
+
+ mutex_lock(&of_rmem_assigned_device_mutex);
+ list_add(&rd->list, &of_rmem_assigned_device_list);
+ mutex_unlock(&of_rmem_assigned_device_mutex);
+
dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
+ } else {
+ kfree(rd);
+ }
return ret;
}
-EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);
+EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx);
/**
* of_reserved_mem_device_release() - release reserved memory device structures
+ * @dev: Pointer to the device to deconfigure
*
* This function releases structures allocated for memory region handling for
* the given device.
*/
void of_reserved_mem_device_release(struct device *dev)
{
- struct reserved_mem *rmem;
- struct device_node *np;
-
- np = of_parse_phandle(dev->of_node, "memory-region", 0);
- if (!np)
- return;
-
- rmem = __find_rmem(np);
- of_node_put(np);
+ struct rmem_assigned_device *rd;
+ struct reserved_mem *rmem = NULL;
+
+ mutex_lock(&of_rmem_assigned_device_mutex);
+ list_for_each_entry(rd, &of_rmem_assigned_device_list, list) {
+ if (rd->dev == dev) {
+ rmem = rd->rmem;
+ list_del(&rd->list);
+ kfree(rd);
+ break;
+ }
+ }
+ mutex_unlock(&of_rmem_assigned_device_mutex);
if (!rmem || !rmem->ops || !rmem->ops->device_release)
return;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-02-18 15:01:05 +0000