From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp04.au.ibm.com (e23smtp04.au.ibm.com [202.81.31.146]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id A319F1A0408 for ; Sat, 25 Apr 2015 22:16:03 +1000 (AEST) Received: from /spool/local by e23smtp04.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sat, 25 Apr 2015 22:16:02 +1000 Received: from d23relay10.au.ibm.com (d23relay10.au.ibm.com [9.190.26.77]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 54E2A2CE804E for ; Sat, 25 Apr 2015 22:15:57 +1000 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t3PCFmMK17301698 for ; Sat, 25 Apr 2015 22:15:57 +1000 Received: from d23av02.au.ibm.com (localhost [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t3PCFNSF013789 for ; Sat, 25 Apr 2015 22:15:23 +1000 From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH kernel v9 01/32] powerpc/iommu: Split iommu_free_table into 2 helpers Date: Sat, 25 Apr 2015 22:14:25 +1000 Message-Id: <1429964096-11524-2-git-send-email-aik@ozlabs.ru> In-Reply-To: <1429964096-11524-1-git-send-email-aik@ozlabs.ru> References: <1429964096-11524-1-git-send-email-aik@ozlabs.ru> Cc: Alexey Kardashevskiy , Gavin Shan , linux-kernel@vger.kernel.org, Alex Williamson , Paul Mackerras , David Gibson List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The iommu_free_table helper release memory it is using (the TCE table and @it_map) and release the iommu_table struct as well. We might not want the very last step as we store iommu_table in parent structures. Signed-off-by: Alexey Kardashevskiy --- arch/powerpc/include/asm/iommu.h | 1 + arch/powerpc/kernel/iommu.c | 58 +++++++++++++++++++++++----------------- 2 files changed, 35 insertions(+), 24 deletions(-) diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index 1e27d63..e2cef38 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -105,6 +105,7 @@ static inline void *get_iommu_table_base(struct device *dev) } /* Frees table for an individual device node */ +extern void iommu_reset_table(struct iommu_table *tbl, const char *node_name); extern void iommu_free_table(struct iommu_table *tbl, const char *node_name); /* Initializes an iommu_table based in values set in the passed-in diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index b054f33..5c154e1 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -708,23 +708,44 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid) return tbl; } +void iommu_reset_table(struct iommu_table *tbl, const char *node_name) +{ + if (!tbl) + return; + + if (tbl->it_map) { + unsigned long bitmap_sz; + unsigned int order; + + /* + * In case we have reserved the first bit, we should not emit + * the warning below. + */ + if (tbl->it_offset == 0) + clear_bit(0, tbl->it_map); + + /* verify that table contains no entries */ + if (!bitmap_empty(tbl->it_map, tbl->it_size)) + pr_warn("%s: Unexpected TCEs for %s\n", __func__, + node_name); + + /* calculate bitmap size in bytes */ + bitmap_sz = BITS_TO_LONGS(tbl->it_size) * sizeof(unsigned long); + + /* free bitmap */ + order = get_order(bitmap_sz); + free_pages((unsigned long) tbl->it_map, order); + } + + memset(tbl, 0, sizeof(*tbl)); +} + void iommu_free_table(struct iommu_table *tbl, const char *node_name) { - unsigned long bitmap_sz; - unsigned int order; - - if (!tbl || !tbl->it_map) { - printk(KERN_ERR "%s: expected TCE map for %s\n", __func__, - node_name); + if (!tbl) return; - } - /* - * In case we have reserved the first bit, we should not emit - * the warning below. - */ - if (tbl->it_offset == 0) - clear_bit(0, tbl->it_map); + iommu_reset_table(tbl, node_name); #ifdef CONFIG_IOMMU_API if (tbl->it_group) { @@ -733,17 +754,6 @@ void iommu_free_table(struct iommu_table *tbl, const char *node_name) } #endif - /* verify that table contains no entries */ - if (!bitmap_empty(tbl->it_map, tbl->it_size)) - pr_warn("%s: Unexpected TCEs for %s\n", __func__, node_name); - - /* calculate bitmap size in bytes */ - bitmap_sz = BITS_TO_LONGS(tbl->it_size) * sizeof(unsigned long); - - /* free bitmap */ - order = get_order(bitmap_sz); - free_pages((unsigned long) tbl->it_map, order); - /* free table */ kfree(tbl); } -- 2.0.0