From patchwork Wed Dec 26 01:54:31 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cho KyongHo X-Patchwork-Id: 1910491 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 4EACC3FE37 for ; Wed, 26 Dec 2012 02:02:05 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TngGB-0003E3-O7; Wed, 26 Dec 2012 01:58:20 +0000 Received: from mailout3.samsung.com ([203.254.224.33]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TngCh-0000tG-CT for linux-arm-kernel@lists.infradead.org; Wed, 26 Dec 2012 01:54:50 +0000 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MFM001IT7XPIIE0@mailout3.samsung.com> for linux-arm-kernel@lists.infradead.org; Wed, 26 Dec 2012 10:54:32 +0900 (KST) Received: from epcpsbgm1.samsung.com ( [203.254.230.51]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 87.56.01231.8D85AD05; Wed, 26 Dec 2012 10:54:32 +0900 (KST) X-AuditID: cbfee61a-b7fa66d0000004cf-e7-50da58d82a4f Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id C4.56.01231.7D85AD05; Wed, 26 Dec 2012 10:54:32 +0900 (KST) Received: from DOPULLIPCHO06 ([12.23.118.152]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0MFM00MH97YVVWA0@mmp1.samsung.com> for linux-arm-kernel@lists.infradead.org; Wed, 26 Dec 2012 10:54:31 +0900 (KST) From: Cho KyongHo To: 'Linux ARM Kernel' , 'Linux IOMMU' , 'Linux Kernel' , 'Linux Samsung SOC' Subject: [PATCH v6 12/12] iommu/exynos: add debugfs entries for System MMU Date: Wed, 26 Dec 2012 10:54:31 +0900 Message-id: <003f01cde30b$f2891d30$d79b5790$%cho@samsung.com> MIME-version: 1.0 X-Mailer: Microsoft Office Outlook 12.0 Thread-index: Ac3jC/JrLVK7dlFyQHa9LNuMl45Zcw== Content-language: ko DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrLIsWRmVeSWpSXmKPExsVy+t8zY90bEbcCDH72clpsenyN1YHRY/OS +gDGKC6blNSczLLUIn27BK6Mm6+ushX02ldsu/aEsYHxn3EXIyeHhICJxIa7vYwQtpjEhXvr 2boYuTiEBJYxSqzcd5QJpuj91GVQiUWMErM65rNAOMuZJHZtu8IOUsUmoCWxeu5xsFEiAncZ JV6e5wEpYhb4yyjx6cwhoCIODmEBL4k9/0xATBYBVYmfH4xAynkFbCX2Pb/IDmELSvyYfI8F xGYWMJB4P6uPFcKWl9i85i0zSKuEgLrEo7+6EJv0JH703mSGKBGR2PfiHdgFLAICEt8mH2KB KJeV2HSAGeKVbnaJlpnmELakxMEVN1gmMIrNQrJ4FpLFs5AsnoVkwwJGllWMoqkFyQXFSem5 hnrFibnFpXnpesn5uZsYIXEitYNxZYPFIUYBDkYlHt6N328GCLEmlhVX5h5ilOBgVhLhdf4I FOJNSaysSi3Kjy8qzUktPsToA3T4RGYp0eR8YAznlcQbGhubmJmYmphbmpqb4hBWEudt9kgJ EBJITyxJzU5NLUgtghnHxMEp1cBYM2WBn0iq92qZyoZ9XJdZlbak54sGmL3feOnpes4pP+cn nJA5rOO1ZmlYQZ7TpqtTrJUWf1P8USxWwZk0seKNS/KNqzXdDjHMSxnKIqUP8Hlp3eDYE6k/ 1TTky1qRe36uBZvX/L0Ts15zlvGDYjV/6f0XrbuuRqxcU962tKmn48r0dyYRS62UWIozEg21 mIuKEwE8ugtywAIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrLIsWRmVeSWpSXmKPExsVy+t9jAd0bEbcCDFYuZrLY9PgaqwOjx+Yl 9QGMUQ2MNhmpiSmpRQqpecn5KZl56bZK3sHxzvGmZgaGuoaWFuZKCnmJuam2Si4+AbpumTlA U5UUyhJzSoFCAYnFxUr6dpgmhIa46VrANEbo+oYEwfUYGaCBhHWMGTdfXWUr6LWv2HbtCWMD 4z/jLkZODgkBE4n3U5exQdhiEhfurQeyuTiEBBYxSszqmM8C4Sxnkti17Qo7SBWbgJbE6rnH GUFsEYG7jBIvz/OAFDEL/GWU+HTmEFARB4ewgJfEnn8mICaLgKrEzw9GIOW8ArYS+55fZIew BSV+TL7HAmIzCxhIvJ/Vxwphy0tsXvOWGaRVQkBd4tFfXYhNehI/em8yQ5SISOx78Y5xAqPA LCSTZiGZNAvJpFlIWhYwsqxiFE0tSC4oTkrPNdQrTswtLs1L10vOz93ECI7DZ1I7GFc2WBxi FOBgVOLh3fj9ZoAQa2JZcWXuIUYJDmYlEV7nj0Ah3pTEyqrUovz4otKc1OJDjD5Af05klhJN zgemiLySeENjEzMjSyMzCyMTc3McwkrivM0eKQFCAumJJanZqakFqUUw45g4OKUaGJfruCwM ijY8Yz+jxHrxu1wZk1V3ZMr+eMlppqXo/qhlusCYIxNQljHz9bYnSh/n7vy39annbfYZSeIv RB9+lc48uf9izFzpv81n8mbf9p55/+btgwICSVvVtzy9FhXRUBfs0+wr/8aR4dHCPRE7FXuX T3tXnbc7dc3Z6TlRT/Pz5qodt99/X1KJpTgj0VCLuag4EQCTAKct8AIAAA== X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121225_205446_963987_BDB727B9 X-CRM114-Status: GOOD ( 18.29 ) X-Spam-Score: -7.6 (-------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-7.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [203.254.224.33 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.0 T_MANY_HDRS_LCASE Odd capitalization of multiple message headers Cc: 'Kukjin Kim' , 'Hyunwoong Kim' , 'Prathyush' , 'Joerg Roedel' , 'Subash Patel' , 'Rahul Sharma' X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This commit adds debugfs directory and nodes for inspecting internal state of System MMU. Signed-off-by: KyongHo Cho --- drivers/iommu/exynos-iommu.c | 204 +++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 198 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 9753e0e..78c0eb7 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -26,12 +26,17 @@ #include #include #include +#include +#include +#include #include #include #include #include +#define MODULE_NAME "exynos-sysmmu" + /* We does not consider super section mapping (16MB) */ #define SECT_ORDER 20 #define LPAGE_ORDER 16 @@ -223,6 +228,7 @@ struct sysmmu_drvdata { struct sysmmu_prefbuf pbufs[MAX_NUM_PBUF]; int num_pbufs; struct sysmmu_version ver; + struct dentry *debugfs_root; struct iommu_domain *domain; unsigned long pgtable; bool runtime_active; @@ -1066,6 +1072,8 @@ static void __init __sysmmu_init_mmuname(struct device *sysmmu, } } +static void __create_debugfs_entry(struct sysmmu_drvdata *drvdata); + static int __init exynos_sysmmu_probe(struct platform_device *pdev) { int i, ret; @@ -1134,6 +1142,8 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev) data->runtime_active = !pm_runtime_enabled(dev); + __create_debugfs_entry(data); + platform_set_drvdata(pdev, data); dev->archdata.iommu = &sysmmu_placeholder; @@ -1238,7 +1248,7 @@ static struct platform_driver exynos_sysmmu_driver __refdata = { .probe = exynos_sysmmu_probe, .driver = { .owner = THIS_MODULE, - .name = "exynos-sysmmu", + .name = MODULE_NAME, .pm = &__pm_ops, .of_match_table = of_match_ptr(sysmmu_of_match), } @@ -1631,6 +1641,8 @@ static struct iommu_ops exynos_iommu_ops = { .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE, }; +static struct dentry *sysmmu_debugfs_root; /* /sys/kernel/debug/sysmmu */ + static int __init exynos_iommu_init(void) { int ret; @@ -1642,17 +1654,197 @@ static int __init exynos_iommu_init(void) return -ENOMEM; } - ret = platform_driver_register(&exynos_sysmmu_driver); + ret = bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); + if (ret) { + kmem_cache_destroy(lv2table_kmem_cache); + pr_err("%s: Failed to register IOMMU ops\n", __func__); + return -EFAULT; + } - if (ret == 0) - ret = bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); + sysmmu_debugfs_root = debugfs_create_dir("sysmmu", NULL); + if (!sysmmu_debugfs_root) + pr_err("%s: Failed to create debugfs entry, 'sysmmu'\n", + __func__); + if (IS_ERR(sysmmu_debugfs_root)) + sysmmu_debugfs_root = NULL; + ret = platform_driver_register(&exynos_sysmmu_driver); if (ret) { - pr_err("%s: Failed to register exynos-iommu driver.\n", - __func__); kmem_cache_destroy(lv2table_kmem_cache); + pr_err("%s: Failed to register System MMU driver\n", __func__); } return ret; } subsys_initcall(exynos_iommu_init); + +static int debug_string_show(struct seq_file *s, void *unused) +{ + char *str = s->private; + + seq_printf(s, "%s\n", str); + + return 0; +} + +static int debug_sysmmu_list_show(struct seq_file *s, void *unused) +{ + struct sysmmu_drvdata *drvdata = s->private; + struct platform_device *pdev = to_platform_device(drvdata->sysmmu); + int idx, maj, min, ret; + + seq_printf(s, "SysMMU Name | Ver | SFR Base\n"); + + if (pm_runtime_enabled(drvdata->sysmmu)) { + ret = pm_runtime_get_sync(drvdata->sysmmu); + if (ret < 0) + return ret; + } + + for (idx = 0; idx < drvdata->nsfrs; idx++) { + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_MEM, idx); + if (!res) + break; + + maj = __sysmmu_version(drvdata, idx, &min); + + if (drvdata->mmuname) { + if (maj == 0) + seq_printf(s, "%11.s | N/A | 0x%08x\n", + drvdata->mmuname[idx], res->start); + else + seq_printf(s, "%11.s | %d.%d | 0x%08x\n", + drvdata->mmuname[idx], maj, min, res->start); + } else { + if (maj == 0) + seq_printf(s, "N/A | 0x%08x\n", res->start); + else + seq_printf(s, "%d.%d | 0x%08x\n", + maj, min, res->start); + } + } + + if (pm_runtime_enabled(drvdata->sysmmu)) + pm_runtime_put(drvdata->sysmmu); + + return 0; +} + +static int debug_next_sibling_show(struct seq_file *s, void *unused) +{ + struct device *dev = s->private; + + if (dev->parent && + !strncmp(dev_name(dev->parent), + MODULE_NAME, strlen(MODULE_NAME))) + seq_printf(s, "%s\n", dev_name(dev->parent)); + return 0; +} + +static int __show_master(struct device *dev, void *data) +{ + struct seq_file *s = data; + + if (strncmp(dev_name(dev), MODULE_NAME, strlen(MODULE_NAME))) + seq_printf(s, "%s\n", dev_name(dev)); + return 0; +} + +static int debug_master_show(struct seq_file *s, void *unused) +{ + struct device *dev = s->private; + + device_for_each_child(dev, s, __show_master); + return 0; +} + +static int debug_string_open(struct inode *inode, struct file *file) +{ + return single_open(file, debug_string_show, inode->i_private); +} + +static int debug_sysmmu_list_open(struct inode *inode, struct file *file) +{ + return single_open(file, debug_sysmmu_list_show, inode->i_private); +} + +static int debug_next_sibling_open(struct inode *inode, struct file *file) +{ + return single_open(file, debug_next_sibling_show, inode->i_private); +} + +static int debug_master_open(struct inode *inode, struct file *file) +{ + return single_open(file, debug_master_show, inode->i_private); +} + +static const struct file_operations debug_string_fops = { + .open = debug_string_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations debug_sysmmu_list_fops = { + .open = debug_sysmmu_list_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations debug_next_sibling_fops = { + .open = debug_next_sibling_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static const struct file_operations debug_master_fops = { + .open = debug_master_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void __init __create_debugfs_entry(struct sysmmu_drvdata *drvdata) +{ + if (!sysmmu_debugfs_root) + return; + + drvdata->debugfs_root = debugfs_create_dir(dev_name(drvdata->sysmmu), + sysmmu_debugfs_root); + if (!drvdata->debugfs_root) + dev_err(drvdata->sysmmu, "Failed to create debugfs dentry\n"); + if (IS_ERR(drvdata->debugfs_root)) + drvdata->debugfs_root = NULL; + + if (!drvdata->debugfs_root) + return; + + if (!debugfs_create_u32("enable", 0664, drvdata->debugfs_root, + &drvdata->activations)) + dev_err(drvdata->sysmmu, + "Failed to create debugfs file 'enable'\n"); + + if (!debugfs_create_x32("pagetable", 0664, drvdata->debugfs_root, + (u32 *)&drvdata->pgtable)) + dev_err(drvdata->sysmmu, + "Failed to create debugfs file 'pagetable'\n"); + + if (!debugfs_create_file("sysmmu_list", 0444, drvdata->debugfs_root, + drvdata, &debug_sysmmu_list_fops)) + dev_err(drvdata->sysmmu, + "Failed to create debugfs file 'sysmmu_list'\n"); + + if (!debugfs_create_file("next_sibling", 0x444, drvdata->debugfs_root, + drvdata->sysmmu, &debug_next_sibling_fops)) + dev_err(drvdata->sysmmu, + "Failed to create debugfs file 'next_siblings'\n"); + + if (!debugfs_create_file("master", 0x444, drvdata->debugfs_root, + drvdata->sysmmu, &debug_master_fops)) + dev_err(drvdata->sysmmu, + "Failed to create debugfs file 'next_siblings'\n"); +}