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[124.171.83.152]) by smtp.gmail.com with ESMTPSA id j198sm9071558pfd.205.2020.08.23.17.39.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 23 Aug 2020 17:39:04 -0700 (PDT) Subject: Re: [PATCH v1 05/10] powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper To: Leonardo Bras , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Christophe Leroy , Joel Stanley , Thiago Jung Bauermann , Ram Pai , Brian King , Murilo Fossa Vicentini , David Dai Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <20200817234033.442511-1-leobras.c@gmail.com> <20200817234033.442511-6-leobras.c@gmail.com> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo 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ZhSFtHopZnBSCUSNDbB+QGy4B/E++Bb02IBTGl/JxmOwG+kZUnymsPvTtnNIeTLHxN/H/ae0 c7E5M+/NpslPCmYnDjs5qg0/3ihh6XuOGggZQOqrYPC3PnsNs3NxirwOkVPQgO6mXxpuifvJ DG9EMkK8IBXnLulqVk54kf7fE0jT/d8RTtJIA92GzsgdK2rpT1MBKKVffjRFGwN7nQVOzi4T XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: Date: Mon, 24 Aug 2020 10:38:57 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200817234033.442511-6-leobras.c@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/08/2020 09:40, Leonardo Bras wrote: > Creates a helper to allow allocating a new iommu_table without the need > to reallocate the iommu_group. > > This will be helpful for replacing the iommu_table for the new DMA window, > after we remove the old one with iommu_tce_table_put(). > > Signed-off-by: Leonardo Bras > --- > arch/powerpc/platforms/pseries/iommu.c | 25 ++++++++++++++----------- > 1 file changed, 14 insertions(+), 11 deletions(-) > > diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c > index 8fe23b7dff3a..39617ce0ec83 100644 > --- a/arch/powerpc/platforms/pseries/iommu.c > +++ b/arch/powerpc/platforms/pseries/iommu.c > @@ -53,28 +53,31 @@ enum { > DDW_EXT_QUERY_OUT_SIZE = 2 > }; > > -static struct iommu_table_group *iommu_pseries_alloc_group(int node) > +static struct iommu_table *iommu_pseries_alloc_table(int node) > { > - struct iommu_table_group *table_group; > struct iommu_table *tbl; > > - table_group = kzalloc_node(sizeof(struct iommu_table_group), GFP_KERNEL, > - node); > - if (!table_group) > - return NULL; > - > tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, node); > if (!tbl) > - goto free_group; > + return NULL; > > INIT_LIST_HEAD_RCU(&tbl->it_group_list); > kref_init(&tbl->it_kref); > + return tbl; > +} > > - table_group->tables[0] = tbl; > +static struct iommu_table_group *iommu_pseries_alloc_group(int node) > +{ > + struct iommu_table_group *table_group; > + > + table_group = kzalloc_node(sizeof(*table_group), GFP_KERNEL, node); I'd prefer you did not make unrelated changes (sizeof(struct iommu_table_group) -> sizeof(*table_group)) so the diff stays shorter and easier to follow. You changed sizeof(struct iommu_table_group) but not sizeof(struct iommu_table) and this confused me enough to spend more time than this straight forward change deserves. Not important in this case though so Reviewed-by: Alexey Kardashevskiy > + if (!table_group) > + return NULL; > > - return table_group; > + table_group->tables[0] = iommu_pseries_alloc_table(node); > + if (table_group->tables[0]) > + return table_group; > > -free_group: > kfree(table_group); > return NULL; > } > -- Alexey