From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752877Ab2HaJ26 (ORCPT ); Fri, 31 Aug 2012 05:28:58 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:54732 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752703Ab2HaJ1N (ORCPT ); Fri, 31 Aug 2012 05:27:13 -0400 From: Philipp Zabel To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Grant Likely , Rob Herring , Paul Gortmaker , Shawn Guo , Richard Zhao , Huang Shijie , Dong Aisheng , kernel@pengutronix.de, devicetree-discuss@lists.ozlabs.org Cc: Philipp Zabel Subject: [PATCH v2 5/9] genalloc: add a global pool list, allow to find pools by phys address Date: Fri, 31 Aug 2012 11:27:00 +0200 Message-Id: <1346405224-20399-6-git-send-email-p.zabel@pengutronix.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1346405224-20399-1-git-send-email-p.zabel@pengutronix.de> References: <1346405224-20399-1-git-send-email-p.zabel@pengutronix.de> X-SA-Exim-Connect-IP: 10.1.0.7 X-SA-Exim-Mail-From: p.zabel@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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; +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 #include #include +#include +#include + +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 + * @np: device node + * + * 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; + 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; + 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