[PATCH 1/2] genalloc: add name arg to gen_pool_get() and devm_gen_pool_create()
Vladimir Zapolskiy
vladimir_zapolskiy at mentor.com
Thu Jun 18 08:26:22 PDT 2015
This change modifies gen_pool_get() and devm_gen_pool_create()
client interfaces adding one more argument "name" of a gen_pool
object.
Due to implementation gen_pool_get() is capable to retrieve only one
gen_pool associated with a device even if multiple gen_pools are
created, fortunately right at the moment it is sufficient for the
clients, hence provide NULL as a valid argument on both producer
devm_gen_pool_create() and consumer gen_pool_get() sides.
Because only one created gen_pool per device is addressable,
explicitly add a restriction to devm_gen_pool_create() to create only
one gen_pool per device, this implies two possible error codes
returned by the function, account it on client side (only misc/sram).
This completes client side changes related to genalloc updates.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy at mentor.com>
---
arch/arm/mach-at91/pm.c | 2 +-
arch/arm/mach-imx/pm-imx5.c | 2 +-
arch/arm/mach-imx/pm-imx6.c | 2 +-
drivers/media/platform/coda/coda-common.c | 2 +-
drivers/misc/sram.c | 8 ++---
include/linux/genalloc.h | 4 +--
lib/genalloc.c | 49 ++++++++++++++++++-------------
7 files changed, 38 insertions(+), 31 deletions(-)
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index e24df77..e65e9db 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -369,7 +369,7 @@ static void __init at91_pm_sram_init(void)
return;
}
- sram_pool = gen_pool_get(&pdev->dev);
+ sram_pool = gen_pool_get(&pdev->dev, NULL);
if (!sram_pool) {
pr_warn("%s: sram pool unavailable!\n", __func__);
return;
diff --git a/arch/arm/mach-imx/pm-imx5.c b/arch/arm/mach-imx/pm-imx5.c
index 1885676..532d4b0 100644
--- a/arch/arm/mach-imx/pm-imx5.c
+++ b/arch/arm/mach-imx/pm-imx5.c
@@ -297,7 +297,7 @@ static int __init imx_suspend_alloc_ocram(
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
index 93ecf55..8ff8fc0 100644
--- a/arch/arm/mach-imx/pm-imx6.c
+++ b/arch/arm/mach-imx/pm-imx6.c
@@ -451,7 +451,7 @@ static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
goto put_node;
}
- ocram_pool = gen_pool_get(&pdev->dev);
+ ocram_pool = gen_pool_get(&pdev->dev, NULL);
if (!ocram_pool) {
pr_warn("%s: ocram pool unavailable!\n", __func__);
ret = -ENODEV;
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 58f6548..284ac4c 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/drivers/media/platform/coda/coda-common.c
@@ -2157,7 +2157,7 @@ static int coda_probe(struct platform_device *pdev)
/* Get IRAM pool from device tree or platform data */
pool = of_gen_pool_get(np, "iram", 0);
if (!pool && pdata)
- pool = gen_pool_get(pdata->iram_dev);
+ pool = gen_pool_get(pdata->iram_dev, NULL);
if (!pool) {
dev_err(&pdev->dev, "iram pool not available\n");
return -ENOMEM;
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 15c33cc..431e1dd 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -186,10 +186,10 @@ static int sram_probe(struct platform_device *pdev)
if (IS_ERR(sram->virt_base))
return PTR_ERR(sram->virt_base);
- sram->pool = devm_gen_pool_create(sram->dev,
- ilog2(SRAM_GRANULARITY), -1);
- if (!sram->pool)
- return -ENOMEM;
+ sram->pool = devm_gen_pool_create(sram->dev, ilog2(SRAM_GRANULARITY),
+ NUMA_NO_NODE, NULL);
+ if (IS_ERR(sram->pool))
+ return PTR_ERR(sram->pool);
ret = sram_reserve_regions(sram, res);
if (ret)
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index 5383bb1..6afa65e 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -118,8 +118,8 @@ extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data);
extern struct gen_pool *devm_gen_pool_create(struct device *dev,
- int min_alloc_order, int nid);
-extern struct gen_pool *gen_pool_get(struct device *dev);
+ int min_alloc_order, int nid, const char *name);
+extern struct gen_pool *gen_pool_get(struct device *dev, const char *name);
bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
size_t size);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index daf0afb..7cf19a5 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -571,23 +571,46 @@ static void devm_gen_pool_release(struct device *dev, void *res)
}
/**
+ * gen_pool_get - Obtain the gen_pool (if any) for a device
+ * @dev: device to retrieve the gen_pool from
+ * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device
+ *
+ * Returns the gen_pool for the device if one is present, or NULL.
+ */
+struct gen_pool *gen_pool_get(struct device *dev, const char *name)
+{
+ struct gen_pool **p = devres_find(dev, devm_gen_pool_release,
+ NULL, NULL);
+
+ if (!p)
+ return NULL;
+ return *p;
+}
+EXPORT_SYMBOL_GPL(gen_pool_get);
+
+/**
* devm_gen_pool_create - managed gen_pool_create
* @dev: device that provides the gen_pool
* @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
- * @nid: node id of the node the pool structure should be allocated on, or -1
+ * @nid: node selector for allocated gen_pool, %NUMA_NO_NODE for all nodes
+ * @name: name of a gen_pool or NULL, identifies a particular gen_pool on device
*
* Create a new special memory pool that can be used to manage special purpose
* memory not managed by the regular kmalloc/kfree interface. The pool will be
* automatically destroyed by the device management code.
*/
struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
- int nid)
+ int nid, const char *name)
{
struct gen_pool **ptr, *pool;
+ /* Check that genpool to be created is uniquely addressed on device */
+ if (gen_pool_get(dev, name))
+ return ERR_PTR(-EINVAL);
+
ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
- return NULL;
+ return ERR_PTR(-ENOMEM);
pool = gen_pool_create(min_alloc_order, nid);
if (pool) {
@@ -595,29 +618,13 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
devres_add(dev, ptr);
} else {
devres_free(ptr);
+ return ERR_PTR(-ENOMEM);
}
return pool;
}
EXPORT_SYMBOL(devm_gen_pool_create);
-/**
- * gen_pool_get - Obtain the gen_pool (if any) for a device
- * @dev: device to retrieve the gen_pool from
- *
- * Returns the gen_pool for the device if one is present, or NULL.
- */
-struct gen_pool *gen_pool_get(struct device *dev)
-{
- struct gen_pool **p = devres_find(dev, devm_gen_pool_release, NULL,
- NULL);
-
- if (!p)
- return NULL;
- return *p;
-}
-EXPORT_SYMBOL_GPL(gen_pool_get);
-
#ifdef CONFIG_OF
/**
* of_gen_pool_get - find a pool by phandle property
@@ -642,7 +649,7 @@ struct gen_pool *of_gen_pool_get(struct device_node *np,
of_node_put(np_pool);
if (!pdev)
return NULL;
- return gen_pool_get(&pdev->dev);
+ return gen_pool_get(&pdev->dev, NULL);
}
EXPORT_SYMBOL_GPL(of_gen_pool_get);
#endif /* CONFIG_OF */
--
2.1.4
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