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Thu, 26 Jul 2018 23:22:43 -0700 Received: from [127.0.0.1] (helo=localhost) by xsj-pvapsmtp01 with smtp (Exim 4.63) (envelope-from ) id 1fiw98-0003g2-Or; Thu, 26 Jul 2018 23:22:38 -0700 Received: from xsj-pvapsmtp01 (xsj-smtp.xilinx.com [149.199.38.66]) by xsj-smtp-dlp1.xlnx.xilinx.com (8.13.8/8.13.1) with ESMTP id w6R6MakA030104; Thu, 26 Jul 2018 23:22:36 -0700 Received: from [172.23.37.94] (helo=xhdappanad40.xilinx.com) by xsj-pvapsmtp01 with esmtp (Exim 4.63) (envelope-from ) id 1fiw95-0003fZ-To; Thu, 26 Jul 2018 23:22:36 -0700 From: Appana Durga Kedareswara rao To: , , , CC: , , , , , Appana Durga Kedareswara rao Subject: [PATCH v4 1/2] fpga: fpga-mgr: Add readback support Date: Fri, 27 Jul 2018 11:52:30 +0530 Message-ID: <1532672551-22146-1-git-send-email-appana.durga.rao@xilinx.com> X-Mailer: git-send-email 2.7.4 X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-8.2.0.1013-23620.005 X-TM-AS-User-Approved-Sender: Yes;Yes X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:149.199.60.100;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(39860400002)(376002)(346002)(136003)(396003)(2980300002)(438002)(189003)(199004)(4326008)(54906003)(476003)(106466001)(77096007)(126002)(186003)(2616005)(26005)(39060400002)(107886003)(486006)(426003)(9786002)(50226002)(48376002)(50466002)(16586007)(5660300001)(110136005)(2201001)(63266004)(356003)(106002)(2906002)(316002)(14444005)(305945005)(81166006)(47776003)(478600001)(6666003)(36756003)(51416003)(8676002)(36386004)(7696005)(336012)(81156014)(8936002)(107986001)(5001870100001)(2101003);DIR:OUT;SFP:1101;SCL:1;SRVR:BYAPR02MB4455;H:xsj-pvapsmtpgw02;FPR:;SPF:Pass;LANG:en;PTR:xapps1.xilinx.com,unknown-60-100.xilinx.com;MX:1;A:1; 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This patch adds readback support for fpga configuration data in the framework through debugfs interface. Usage: cat /sys/kernel/debug/fpga/fpga0/image Signed-off-by: Appana Durga Kedareswara rao --- Changes for v4: --> None. Changes for v3: --> None. Changes for v2: --> Fixed debug attribute path and name as suggested by Alan --> Add config entry for DEBUG as suggested by Alan --> Fixed trival coding style issues. drivers/fpga/Kconfig | 7 +++++ drivers/fpga/fpga-mgr.c | 68 +++++++++++++++++++++++++++++++++++++++++++ include/linux/fpga/fpga-mgr.h | 5 ++++ 3 files changed, 80 insertions(+) diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig index 53d3f55..838ad4e 100644 --- a/drivers/fpga/Kconfig +++ b/drivers/fpga/Kconfig @@ -11,6 +11,13 @@ menuconfig FPGA if FPGA +config FPGA_MGR_DEBUG_FS + tristate "FPGA Debug fs" + select DEBUG_FS + help + FPGA manager debug provides support for reading fpga configuration + information. + config FPGA_MGR_SOCFPGA tristate "Altera SOCFPGA FPGA Manager" depends on ARCH_SOCFPGA || COMPILE_TEST diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c index 9939d2c..4bea860 100644 --- a/drivers/fpga/fpga-mgr.c +++ b/drivers/fpga/fpga-mgr.c @@ -484,6 +484,48 @@ void fpga_mgr_put(struct fpga_manager *mgr) } EXPORT_SYMBOL_GPL(fpga_mgr_put); +#ifdef CONFIG_FPGA_MGR_DEBUG_FS +#include + +static int fpga_mgr_read(struct seq_file *s, void *data) +{ + struct fpga_manager *mgr = (struct fpga_manager *)s->private; + int ret = 0; + + if (!mgr->mops->read) + return -ENOENT; + + if (!mutex_trylock(&mgr->ref_mutex)) + return -EBUSY; + + if (mgr->state != FPGA_MGR_STATE_OPERATING) { + ret = -EPERM; + goto err_unlock; + } + + /* Read the FPGA configuration data from the fabric */ + ret = mgr->mops->read(mgr, s); + if (ret) + dev_err(&mgr->dev, "Error while reading configuration data from FPGA\n"); + +err_unlock: + mutex_unlock(&mgr->ref_mutex); + + return ret; +} + +static int fpga_mgr_read_open(struct inode *inode, struct file *file) +{ + return single_open(file, fpga_mgr_read, inode->i_private); +} + +static const struct file_operations fpga_mgr_ops_image = { + .owner = THIS_MODULE, + .open = fpga_mgr_read_open, + .read = seq_read, +}; +#endif + /** * fpga_mgr_lock - Lock FPGA manager for exclusive use * @mgr: fpga manager @@ -581,6 +623,29 @@ int fpga_mgr_register(struct device *dev, const char *name, if (ret) goto error_device; +#ifdef CONFIG_FPGA_MGR_DEBUG_FS + struct dentry *d, *parent; + + mgr->dir = debugfs_create_dir("fpga", NULL); + if (!mgr->dir) + goto error_device; + + parent = mgr->dir; + d = debugfs_create_dir(mgr->dev.kobj.name, parent); + if (!d) { + debugfs_remove_recursive(parent); + goto error_device; + } + + parent = d; + d = debugfs_create_file("image", 0644, parent, mgr, + &fpga_mgr_ops_image); + if (!d) { + debugfs_remove_recursive(mgr->dir); + goto error_device; + } +#endif + dev_info(&mgr->dev, "%s registered\n", mgr->name); return 0; @@ -604,6 +669,9 @@ void fpga_mgr_unregister(struct device *dev) dev_info(&mgr->dev, "%s %s\n", __func__, mgr->name); +#ifdef CONFIG_FPGA_MGR_DEBUG_FS + debugfs_remove_recursive(mgr->dir); +#endif /* * If the low level driver provides a method for putting fpga into * a desired state upon unregister, do it. diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h index 3c6de23..e9e17a9 100644 --- a/include/linux/fpga/fpga-mgr.h +++ b/include/linux/fpga/fpga-mgr.h @@ -114,6 +114,7 @@ struct fpga_image_info { * @write: write count bytes of configuration data to the FPGA * @write_sg: write the scatter list of configuration data to the FPGA * @write_complete: set FPGA to operating state after writing is done + * @read: optional: read FPGA configuration information * @fpga_remove: optional: Set FPGA into a specific state during driver remove * @groups: optional attribute groups. * @@ -131,6 +132,7 @@ struct fpga_manager_ops { int (*write_sg)(struct fpga_manager *mgr, struct sg_table *sgt); int (*write_complete)(struct fpga_manager *mgr, struct fpga_image_info *info); + int (*read)(struct fpga_manager *mgr, struct seq_file *s); void (*fpga_remove)(struct fpga_manager *mgr); const struct attribute_group **groups; }; @@ -151,6 +153,9 @@ struct fpga_manager { enum fpga_mgr_states state; const struct fpga_manager_ops *mops; void *priv; +#ifdef CONFIG_FPGA_MGR_DEBUG_FS + struct dentry *dir; +#endif }; #define to_fpga_manager(d) container_of(d, struct fpga_manager, dev)