From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754008AbZAIQVr (ORCPT ); Fri, 9 Jan 2009 11:21:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752504AbZAIQTv (ORCPT ); Fri, 9 Jan 2009 11:19:51 -0500 Received: from outbound-wa4.frontbridge.com ([216.32.181.16]:32100 "EHLO WA4EHSOBE004.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752189AbZAIQTn (ORCPT ); Fri, 9 Jan 2009 11:19:43 -0500 X-BigFish: VPS13(zz9321rzzzzz32i43j64h) X-Spam-TCS-SCL: 3:0 X-FB-SS: 5, X-WSS-ID: 0KD7PCH-03-IWW-01 From: Joerg Roedel To: linux-kernel@vger.kernel.org CC: mingo@redhat.com, dwmw2@infradead.org, fujita.tomonori@lab.ntt.co.jp, netdev@vger.kernel.org, iommu@lists.linux-foundation.org, Joerg Roedel Subject: [PATCH 05/16] dma-debug: add initialization code Date: Fri, 9 Jan 2009 17:19:19 +0100 Message-ID: <1231517970-20288-6-git-send-email-joerg.roedel@amd.com> X-Mailer: git-send-email 1.5.6.4 In-Reply-To: <1231517970-20288-1-git-send-email-joerg.roedel@amd.com> References: <1231517970-20288-1-git-send-email-joerg.roedel@amd.com> X-OriginalArrivalTime: 09 Jan 2009 16:19:30.0732 (UTC) FILETIME=[0D0B46C0:01C97276] MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Impact: add code to initialize dma-debug core data structures Signed-off-by: Joerg Roedel --- include/linux/dma-debug.h | 14 +++++++++ lib/dma-debug.c | 66 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 80 insertions(+), 0 deletions(-) diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h index ce4ace7..345d538 100644 --- a/include/linux/dma-debug.h +++ b/include/linux/dma-debug.h @@ -20,6 +20,20 @@ #ifndef __DMA_DEBUG_H #define __DMA_DEBUG_H +#include + struct device; +#ifdef CONFIG_DMA_API_DEBUG + +extern void dma_debug_init(u32 num_entries); + +#else /* CONFIG_DMA_API_DEBUG */ + +static inline void dma_debug_init(u32 num_entries) +{ +} + +#endif /* CONFIG_DMA_API_DEBUG */ + #endif /* __DMA_DEBUG_H */ diff --git a/lib/dma-debug.c b/lib/dma-debug.c index c5444d4..b932f15 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -21,6 +21,7 @@ #include #include #include +#include #define HASH_SIZE 256 #define HASH_FN_SHIFT 20 @@ -195,3 +196,68 @@ static void dma_entry_free(struct dma_debug_entry *entry) spin_unlock_irqrestore(&free_entries_lock, flags); } +/* + * DMA-API debugging init code + * + * The init code does two things: + * 1. Initialize core data structures + * 2. Preallocate a given number of dma_debug_entry structs + */ + +static int prealloc_memory(u32 num_entries) +{ + struct dma_debug_entry *entry, *next_entry; + int i; + + for (i = 0; i < num_entries; ++i) { + entry = kmalloc(sizeof(*entry), GFP_KERNEL | __GFP_ZERO); + if (!entry) + goto out_err; + + list_add_tail(&entry->list, &free_entries); + } + + num_free_entries = num_entries; + min_free_entries = num_entries; + + printk(KERN_INFO "DMA-API: preallocated %d debug entries\n", + num_entries); + + return 0; + +out_err: + + list_for_each_entry_safe(entry, next_entry, &free_entries, list) { + list_del(&entry->list); + kfree(entry); + } + + return -ENOMEM; +} + +/* + * Let the architectures decide how many entries should be preallocated. + */ +void dma_debug_init(u32 num_entries) +{ + int i; + + if (global_disable) + return; + + for (i = 0; i < HASH_SIZE; ++i) { + INIT_LIST_HEAD(&dma_entry_hash[i].list); + dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; + } + + if (prealloc_memory(num_entries) != 0) { + printk(KERN_ERR "DMA-API: debugging out of memory error " + "- disabled\n"); + global_disable = true; + + return; + } + + printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n"); +} + -- 1.5.6.4