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Date: Mon, 3 Sep 2012 10:09:35 +0800
From: Shawn Guo <shawn.guo@...aro.org>
To: Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Richard Zhao <richard.zhao@...escale.com>,
Huang Shijie <shijie8@...il.com>,
Dong Aisheng <dong.aisheng@...aro.org>, kernel@...gutronix.de,
devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH v2 5/9] genalloc: add a global pool list, allow to find
pools by phys address
On Fri, Aug 31, 2012 at 11:27:00AM +0200, Philipp Zabel wrote:
> This patch keeps all created pools in a global list and adds two
> functions that allow to retrieve the gen_pool pointer from a known
> physical address and from a device tree node.
>
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> ---
> include/linux/genalloc.h | 14 +++++++++
> lib/genalloc.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 91 insertions(+)
>
> diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
> index 5e98eeb..46ff435 100644
> --- a/include/linux/genalloc.h
> +++ b/include/linux/genalloc.h
> @@ -33,6 +33,7 @@
> * General purpose special memory pool descriptor.
> */
> struct gen_pool {
> + struct list_head next_pool; /* pool in global list */
> spinlock_t lock;
> struct list_head chunks; /* list of chunks in this pool */
> int min_alloc_order; /* minimum allocation order */
> @@ -78,4 +79,17 @@ extern void gen_pool_for_each_chunk(struct gen_pool *,
> void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *);
> extern size_t gen_pool_avail(struct gen_pool *);
> extern size_t gen_pool_size(struct gen_pool *);
> +extern struct gen_pool *gen_pool_find_by_phys(phys_addr_t phys);
> +
> +#ifdef CONFIG_OF
> +struct device_node;
This should be put above/outside #ifdef, as it's used in #else block
as well?
> +extern struct gen_pool *of_get_named_gen_pool(struct device_node *np,
> + const char *propname, int index);
> +#else
> +inline struct gen_pool *of_get_named_gen_pool(struct device_node *np,
> + const char *propname, int index)
> +{
> + return NULL;
> +}
> +#endif
> #endif /* __GENALLOC_H__ */
> diff --git a/lib/genalloc.c b/lib/genalloc.c
> index 6bc04aa..df2d8f9 100644
> --- a/lib/genalloc.c
> +++ b/lib/genalloc.c
> @@ -34,6 +34,11 @@
> #include <linux/rculist.h>
> #include <linux/interrupt.h>
> #include <linux/genalloc.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +
> +static LIST_HEAD(pools);
> +static DEFINE_SPINLOCK(list_lock);
>
> static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set)
> {
> @@ -152,6 +157,9 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
> spin_lock_init(&pool->lock);
> INIT_LIST_HEAD(&pool->chunks);
> pool->min_alloc_order = min_alloc_order;
> + spin_lock(&list_lock);
> + list_add_rcu(&pool->next_pool, &pools);
> + spin_unlock(&list_lock);
> }
> return pool;
> }
> @@ -234,6 +242,9 @@ void gen_pool_destroy(struct gen_pool *pool)
> int order = pool->min_alloc_order;
> int bit, end_bit;
>
> + spin_lock(&list_lock);
> + list_del_rcu(&pool->next_pool);
> + spin_unlock(&list_lock);
> list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
> chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
> list_del(&chunk->next_chunk);
> @@ -400,3 +411,69 @@ size_t gen_pool_size(struct gen_pool *pool)
> return size;
> }
> EXPORT_SYMBOL_GPL(gen_pool_size);
> +
> +/**
> + * gen_pool_find_by_phys - find a pool by physical start address
> + * @phys: physical address as added with gen_pool_add_virt
> + *
> + * Returns the pool that contains the chunk starting at phys,
> + * or NULL if not found.
> + */
> +struct gen_pool *gen_pool_find_by_phys(phys_addr_t phys)
> +{
> + struct gen_pool *pool, *found = NULL;
> + struct gen_pool_chunk *chunk;
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(pool, &pools, next_pool) {
> + list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
> + if (phys == chunk->phys_addr) {
> + found = pool;
> + break;
> + }
> + }
> + }
> + rcu_read_unlock();
> +
> + return found;
> +}
> +EXPORT_SYMBOL_GPL(gen_pool_find_by_phys);
> +
> +#ifdef CONFIG_OF
> +/**
> + * of_get_named_gen_pool - find a pool by the physical address in
"in" what?
> + * @np: device node
@propname
@index
> + *
> + * Returns the pool that contains the chunk starting at the physical
> + * address of the np device node, or NULL if not found.
> + */
> +struct gen_pool *of_get_named_gen_pool(struct device_node *np,
> + const char *propname, int index)
> +{
> + struct property *prop;
> + const __be32 *list;
> + int size;
> + phandle phandle;
> + struct device_node *np_pool;
> + const u32 *reg;
> + u64 addr;
> +
> + prop = of_find_property(np, propname, &size);
> + if (!prop)
> + return NULL;
> + list = prop->value;
> + size /= sizeof(*list);
> + phandle = be32_to_cpup(list);
> + np_pool = of_find_node_by_phandle(phandle);
> + if (!np_pool)
> + return NULL;
Helper of_parse_phandle() helps here.
> + reg = of_get_property(np_pool, "reg", NULL);
> + if (!reg)
> + return NULL;
> + addr = of_translate_address(np_pool, reg);
> + if (addr == OF_BAD_ADDR)
> + return NULL;
I would suggest use of_address_to_resource instead and then retrieve
the address from resource->start.
> + return gen_pool_find_by_phys((phys_addr_t) addr);
> +}
> +EXPORT_SYMBOL_GPL(of_get_named_gen_pool);
> +#endif /* CONFIG_OF */
> --
> 1.7.10.4
>
--
Regards,
Shawn
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