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Fri, 23 Jan 2015 15:52:04 +0000 (GMT) From: Marek Szyprowski To: iommu@lists.linux-foundation.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 09/18] iommu: exynos: refactor function parameters to simplify code Date: Fri, 23 Jan 2015 16:51:19 +0100 Message-id: <1422028288-891-10-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.2 In-reply-to: <1422028288-891-1-git-send-email-m.szyprowski@samsung.com> References: <1422028288-891-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrKLMWRmVeSWpSXmKPExsVy+t/xK7qTcw+FGGy7JmTxd9IxdouJKycz W0y6P4HFYsF+a4vO2RvYLV7cu8hi0f/4NbPF2aY37BadE5ewW3y58pDJYtPja6wWM87vY7JY e+Quu8Wp65/ZLP71HmS0+L9nB7vFkYe72S1mTH7JZrFq1x9Gi9u/+SxefjzB4iDq8eTgPCaP NfPWMHr8/jWJ0WPnrLvsHrM7ZrJ6bF6h5bFpVSebx+Yl9R63/z1m9ph8Yzmjx5UTTawevc3v 2Dz6tqxi9Pi8SS6AL4rLJiU1J7MstUjfLoEr4/nlC8wFT6wr5vx8ztzAuMSwi5GDQ0LARGLa ibQuRk4gU0ziwr31bF2MXBxCAksZJZqbd7NAOH1MEp+7L7OAVLEJGEp0ve1iA7FFBPIlXuz9 C1bELLCXVWLDgtNMIAlhgQiJl5dfg9ksAqoSj152sYPYvALuEi+nv2aHWCcn8f/lCrAaTqD4 j9aZYAuEBNwk1i/uYZ7AyLuAkWEVo2hqaXJBcVJ6rpFecWJucWleul5yfu4mRkjUfN3BuPSY 1SFGAQ5GJR7eA28OhgixJpYVV+YeYpTgYFYS4c1IORQixJuSWFmVWpQfX1Sak1p8iJGJg1Oq gbH737z1rE2T567k99v3ePr2fTca+P+8PM31511+2fkJx3qLpz623MshfjG8+9bt+5Oiu/iC bvz501j4Y6/sYTufOhGHD5M/CLUeMD5x+v+OquX/ZlyeoPYh6q3808kZtnIzXwZ1lklvsNRl KFr37/2+valH3Zf8YJ//KezhWj3u+invD8lq6YeEKbEUZyQaajEXFScCAEucrY54AgAA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150123_075231_844096_1DB45110 X-CRM114-Status: GOOD ( 17.48 ) X-Spam-Score: -5.0 (-----) Cc: Rob Herring , Thierry Reding , Shaik Ameer Basha , Joonyoung Shim , Arnd Bergmann , Inki Dae , Seung-Woo Kim , Joerg Roedel , Will Deacon , Tomasz Figa , linaro-mm-sig@lists.linaro.org, Kyungmin Park , Kukjin Kim , Laurent Pinchart , Olof Johansson , Cho KyongHo , David Wodhouse , Marek Szyprowski X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch simplifies the code by: - refactoring function parameters from struct device pointer to direct pointer to struct sysmmu drvdata - moving list_head enteries from struct exynos_iommu_owner directly to struct sysmmu_drvdata Signed-off-by: Marek Szyprowski --- drivers/iommu/exynos-iommu.c | 93 ++++++++++++++++++++++---------------------- 1 file changed, 46 insertions(+), 47 deletions(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index aa8c4b0..862261f 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -186,8 +186,6 @@ static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = { /* attached to dev.archdata.iommu of the master device */ struct exynos_iommu_owner { - struct list_head client; /* entry of exynos_iommu_domain.clients */ - struct device *dev; struct device *sysmmu; }; @@ -208,6 +206,7 @@ struct sysmmu_drvdata { int activations; spinlock_t lock; struct iommu_domain *domain; + struct list_head domain_node; phys_addr_t pgtable; int version; }; @@ -508,12 +507,10 @@ static void __sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, __raw_writel(iova | 0x1, data->sfrbase + REG_MMU_FLUSH_ENTRY); } -static void sysmmu_tlb_invalidate_flpdcache(struct device *dev, +static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, sysmmu_iova_t iova) { unsigned long flags; - struct exynos_iommu_owner *owner = dev->archdata.iommu; - struct sysmmu_drvdata *data = dev_get_drvdata(owner->sysmmu); if (!IS_ERR(data->clk_master)) clk_enable(data->clk_master); @@ -527,14 +524,10 @@ static void sysmmu_tlb_invalidate_flpdcache(struct device *dev, clk_disable(data->clk_master); } -static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova, - size_t size) +static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, + sysmmu_iova_t iova, size_t size) { - struct exynos_iommu_owner *owner = dev->archdata.iommu; unsigned long flags; - struct sysmmu_drvdata *data; - - data = dev_get_drvdata(owner->sysmmu); spin_lock_irqsave(&data->lock, flags); if (is_sysmmu_active(data)) { @@ -564,8 +557,8 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova, if (!IS_ERR(data->clk_master)) clk_disable(data->clk_master); } else { - dev_dbg(dev, "disabled. Skipping TLB invalidation @ %#x\n", - iova); + dev_dbg(data->master, + "disabled. Skipping TLB invalidation @ %#x\n", iova); } spin_unlock_irqrestore(&data->lock, flags); } @@ -703,7 +696,7 @@ err_pgtable: static void exynos_iommu_domain_destroy(struct iommu_domain *domain) { struct exynos_iommu_domain *priv = domain->priv; - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; unsigned long flags; int i; @@ -711,14 +704,12 @@ static void exynos_iommu_domain_destroy(struct iommu_domain *domain) spin_lock_irqsave(&priv->lock, flags); - list_for_each_entry(owner, &priv->clients, client) { - while (!exynos_sysmmu_disable(owner->dev)) - ; /* until System MMU is actually disabled */ + list_for_each_entry(data, &priv->clients, domain_node) { + if (__sysmmu_disable(data)) + data->master = NULL; + list_del_init(&data->domain_node); } - while (!list_empty(&priv->clients)) - list_del_init(priv->clients.next); - spin_unlock_irqrestore(&priv->lock, flags); for (i = 0; i < NUM_LV1ENTRIES; i++) @@ -737,20 +728,26 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain, { struct exynos_iommu_owner *owner = dev->archdata.iommu; struct exynos_iommu_domain *priv = domain->priv; + struct sysmmu_drvdata *data; phys_addr_t pagetable = virt_to_phys(priv->pgtable); unsigned long flags; - int ret; + int ret = -ENODEV; - spin_lock_irqsave(&priv->lock, flags); + if (!has_sysmmu(dev)) + return -ENODEV; - ret = __exynos_sysmmu_enable(dev, pagetable, domain); - if (ret == 0) { - list_add_tail(&owner->client, &priv->clients); - owner->domain = domain; + data = dev_get_drvdata(owner->sysmmu); + if (data) { + ret = __sysmmu_enable(data, pagetable, domain); + if (ret >= 0) { + data->master = dev; + + spin_lock_irqsave(&priv->lock, flags); + list_add_tail(&data->domain_node, &priv->clients); + spin_unlock_irqrestore(&priv->lock, flags); + } } - spin_unlock_irqrestore(&priv->lock, flags); - if (ret < 0) { dev_err(dev, "%s: Failed to attach IOMMU with pgtable %pa\n", __func__, &pagetable); @@ -766,26 +763,29 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain, static void exynos_iommu_detach_device(struct iommu_domain *domain, struct device *dev) { - struct exynos_iommu_owner *owner; struct exynos_iommu_domain *priv = domain->priv; phys_addr_t pagetable = virt_to_phys(priv->pgtable); + struct sysmmu_drvdata *data; unsigned long flags; + int found = 0; - spin_lock_irqsave(&priv->lock, flags); + if (!has_sysmmu(dev)) + return; - list_for_each_entry(owner, &priv->clients, client) { - if (owner == dev->archdata.iommu) { - if (exynos_sysmmu_disable(dev)) { - list_del_init(&owner->client); - owner->domain = NULL; + spin_lock_irqsave(&priv->lock, flags); + list_for_each_entry(data, &priv->clients, domain_node) { + if (data->master == dev) { + if (__sysmmu_disable(data)) { + data->master = NULL; + list_del_init(&data->domain_node); } + found = true; break; } } - spin_unlock_irqrestore(&priv->lock, flags); - if (owner == dev->archdata.iommu) + if (found) dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__, &pagetable); else @@ -832,12 +832,11 @@ static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv, * not currently mapped. */ if (need_flush_flpd_cache) { - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; spin_lock(&priv->lock); - list_for_each_entry(owner, &priv->clients, client) - sysmmu_tlb_invalidate_flpdcache( - owner->dev, iova); + list_for_each_entry(data, &priv->clients, domain_node) + sysmmu_tlb_invalidate_flpdcache(data, iova); spin_unlock(&priv->lock); } } @@ -872,13 +871,13 @@ static int lv1set_section(struct exynos_iommu_domain *priv, spin_lock(&priv->lock); if (lv1ent_page_zero(sent)) { - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; /* * Flushing FLPD cache in System MMU v3.3 that may cache a FLPD * entry by speculative prefetch of SLPD which has no mapping. */ - list_for_each_entry(owner, &priv->clients, client) - sysmmu_tlb_invalidate_flpdcache(owner->dev, iova); + list_for_each_entry(data, &priv->clients, domain_node) + sysmmu_tlb_invalidate_flpdcache(data, iova); } spin_unlock(&priv->lock); @@ -983,13 +982,13 @@ static int exynos_iommu_map(struct iommu_domain *domain, unsigned long l_iova, static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *priv, sysmmu_iova_t iova, size_t size) { - struct exynos_iommu_owner *owner; + struct sysmmu_drvdata *data; unsigned long flags; spin_lock_irqsave(&priv->lock, flags); - list_for_each_entry(owner, &priv->clients, client) - sysmmu_tlb_invalidate_entry(owner->dev, iova, size); + list_for_each_entry(data, &priv->clients, domain_node) + sysmmu_tlb_invalidate_entry(data, iova, size); spin_unlock_irqrestore(&priv->lock, flags); }