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Subject[PATCH v3 14/21] fpga: dfl: add fpga manager platform driver for FME
Date
This patch adds fpga manager driver for FPGA Management Engine (FME). It
implements fpga_manager_ops for FPGA Partial Reconfiguration function.

Signed-off-by: Tim Whisonant <tim.whisonant@intel.com>
Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
Signed-off-by: Shiva Rao <shiva.rao@intel.com>
Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
Signed-off-by: Kang Luwei <luwei.kang@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
----
v3: rename driver to dfl-fpga-fme-mgr
implemented status callback for fpga manager
rebased due to fpga api changes
---
.../ABI/testing/sysfs-platform-fpga-dfl-fme-mgr | 8 +
drivers/fpga/Kconfig | 6 +
drivers/fpga/Makefile | 1 +
drivers/fpga/fpga-dfl-fme-mgr.c | 318 +++++++++++++++++++++
drivers/fpga/fpga-dfl.h | 39 ++-
5 files changed, 371 insertions(+), 1 deletion(-)
create mode 100644 Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme-mgr
create mode 100644 drivers/fpga/fpga-dfl-fme-mgr.c

diff --git a/Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme-mgr b/Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme-mgr
new file mode 100644
index 0000000..2d4f917
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-fpga-dfl-fme-mgr
@@ -0,0 +1,8 @@
+What: /sys/bus/platform/devices/fpga-dfl-fme-mgr.0/interface_id
+Date: November 2017
+KernelVersion: 4.15
+Contact: Wu Hao <hao.wu@intel.com>
+Description: Read-only. It returns interface id of partial reconfiguration
+ hardware. Userspace could use this information to check if
+ current hardware is compatible with given image before FPGA
+ programming.
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 57da904..0171ecb 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -150,6 +150,12 @@ config FPGA_DFL_FME
FPGA platform level management features. There shall be 1 FME
per DFL based FPGA device.

+config FPGA_DFL_FME_MGR
+ tristate "FPGA DFL FME Manager Driver"
+ depends on FPGA_DFL_FME
+ help
+ Say Y to enable FPGA Manager driver for FPGA Management Engine.
+
config INTEL_FPGA_DFL_PCI
tristate "Intel FPGA DFL PCIe Device Driver"
depends on PCI && FPGA_DFL
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index cc75bb3..6378580 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_OF_FPGA_REGION) += of-fpga-region.o
# FPGA Device Feature List Support
obj-$(CONFIG_FPGA_DFL) += fpga-dfl.o
obj-$(CONFIG_FPGA_DFL_FME) += fpga-dfl-fme.o
+obj-$(CONFIG_FPGA_DFL_FME_MGR) += fpga-dfl-fme-mgr.o

fpga-dfl-fme-objs := dfl-fme-main.o dfl-fme-pr.o

diff --git a/drivers/fpga/fpga-dfl-fme-mgr.c b/drivers/fpga/fpga-dfl-fme-mgr.c
new file mode 100644
index 0000000..70356ce
--- /dev/null
+++ b/drivers/fpga/fpga-dfl-fme-mgr.c
@@ -0,0 +1,318 @@
+/*
+ * FPGA Manager Driver for FPGA Management Engine (FME)
+ *
+ * Copyright (C) 2017 Intel Corporation, Inc.
+ *
+ * Authors:
+ * Kang Luwei <luwei.kang@intel.com>
+ * Xiao Guangrong <guangrong.xiao@linux.intel.com>
+ * Wu Hao <hao.wu@intel.com>
+ * Joseph Grecco <joe.grecco@intel.com>
+ * Enno Luebbers <enno.luebbers@intel.com>
+ * Tim Whisonant <tim.whisonant@intel.com>
+ * Ananda Ravuri <ananda.ravuri@intel.com>
+ * Christopher Rauer <christopher.rauer@intel.com>
+ * Henry Mitchel <henry.mitchel@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL version 2.
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <linux/module.h>
+#include <linux/iopoll.h>
+#include <linux/fpga/fpga-mgr.h>
+
+#include "fpga-dfl.h"
+#include "dfl-fme.h"
+
+#define PR_WAIT_TIMEOUT 8000000
+#define PR_HOST_STATUS_IDLE 0
+
+struct fme_mgr_priv {
+ void __iomem *ioaddr;
+ u64 pr_error;
+};
+
+static ssize_t interface_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fpga_manager *mgr = dev_get_drvdata(dev);
+ struct fme_mgr_priv *priv = mgr->priv;
+ u64 intfc_id_l, intfc_id_h;
+
+ intfc_id_l = readq(priv->ioaddr + FME_PR_INTFC_ID_L);
+ intfc_id_h = readq(priv->ioaddr + FME_PR_INTFC_ID_H);
+
+ return scnprintf(buf, PAGE_SIZE, "%016llx%016llx\n",
+ (unsigned long long)intfc_id_h,
+ (unsigned long long)intfc_id_l);
+}
+static DEVICE_ATTR_RO(interface_id);
+
+static const struct attribute *fme_mgr_attrs[] = {
+ &dev_attr_interface_id.attr,
+ NULL,
+};
+
+static u64 pr_error_to_mgr_status(u64 err)
+{
+ u64 status = 0;
+
+ if (err & FME_PR_ERR_OPERATION_ERR)
+ status |= FPGA_MGR_STATUS_OPERATION_ERR;
+ if (err & FME_PR_ERR_CRC_ERR)
+ status |= FPGA_MGR_STATUS_CRC_ERR;
+ if (err & FME_PR_ERR_INCOMPATIBLE_BS)
+ status |= FPGA_MGR_STATUS_INCOMPATIBLE_IMAGE_ERR;
+ if (err & FME_PR_ERR_PROTOCOL_ERR)
+ status |= FPGA_MGR_STATUS_IP_PROTOCOL_ERR;
+ if (err & FME_PR_ERR_FIFO_OVERFLOW)
+ status |= FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR;
+
+ return status;
+}
+
+static u64 fme_mgr_pr_error_handle(void __iomem *fme_pr)
+{
+ u64 pr_status, pr_error;
+
+ pr_status = readq(fme_pr + FME_PR_STS);
+ if (!(pr_status & FME_PR_STS_PR_STS))
+ return 0;
+
+ pr_error = readq(fme_pr + FME_PR_ERR);
+ writeq(pr_error, fme_pr + FME_PR_ERR);
+
+ return pr_error;
+}
+
+static int fme_mgr_write_init(struct fpga_manager *mgr,
+ struct fpga_image_info *info,
+ const char *buf, size_t count)
+{
+ struct device *dev = &mgr->dev;
+ struct fme_mgr_priv *priv = mgr->priv;
+ void __iomem *fme_pr = priv->ioaddr;
+ u64 pr_ctrl, pr_status;
+
+ if (!(info->flags & FPGA_MGR_PARTIAL_RECONFIG)) {
+ dev_err(dev, "only support partial reconfiguration.\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "resetting PR before initiated PR\n");
+
+ pr_ctrl = readq(fme_pr + FME_PR_CTRL);
+ pr_ctrl |= FME_PR_CTRL_PR_RST;
+ writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
+
+ if (readq_poll_timeout(fme_pr + FME_PR_CTRL, pr_ctrl,
+ pr_ctrl & FME_PR_CTRL_PR_RSTACK, 1,
+ PR_WAIT_TIMEOUT)) {
+ dev_err(dev, "maximum PR timeout\n");
+ return -ETIMEDOUT;
+ }
+
+ pr_ctrl = readq(fme_pr + FME_PR_CTRL);
+ pr_ctrl &= ~FME_PR_CTRL_PR_RST;
+ writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
+
+ dev_dbg(dev,
+ "waiting for PR resource in HW to be initialized and ready\n");
+
+ if (readq_poll_timeout(fme_pr + FME_PR_STS, pr_status,
+ (pr_status & FME_PR_STS_PR_STS) ==
+ FME_PR_STS_PR_STS_IDLE, 1, PR_WAIT_TIMEOUT)) {
+ dev_err(dev, "maximum PR timeout\n");
+ priv->pr_error = fme_mgr_pr_error_handle(fme_pr);
+ return -ETIMEDOUT;
+ }
+
+ dev_dbg(dev, "check and clear previous PR error\n");
+ priv->pr_error = fme_mgr_pr_error_handle(fme_pr);
+ if (priv->pr_error)
+ dev_dbg(dev, "previous PR error detected %llx\n",
+ (unsigned long long)priv->pr_error);
+
+ dev_dbg(dev, "set PR port ID\n");
+
+ pr_ctrl = readq(fme_pr + FME_PR_CTRL);
+ pr_ctrl &= ~FME_PR_CTRL_PR_RGN_ID;
+ pr_ctrl |= FIELD_PREP(FME_PR_CTRL_PR_RGN_ID, info->region_id);
+ writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
+
+ return 0;
+}
+
+static int fme_mgr_write(struct fpga_manager *mgr,
+ const char *buf, size_t count)
+{
+ struct device *dev = &mgr->dev;
+ struct fme_mgr_priv *priv = mgr->priv;
+ void __iomem *fme_pr = priv->ioaddr;
+ u64 pr_ctrl, pr_status, pr_data;
+ int delay = 0, pr_credit, i = 0;
+
+ dev_dbg(dev, "start request\n");
+
+ pr_ctrl = readq(fme_pr + FME_PR_CTRL);
+ pr_ctrl |= FME_PR_CTRL_PR_START;
+ writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
+
+ dev_dbg(dev, "pushing data from bitstream to HW\n");
+
+ pr_status = readq(fme_pr + FME_PR_STS);
+ pr_credit = FIELD_GET(FME_PR_STS_PR_CREDIT, pr_status);
+
+ while (count > 0) {
+ while (pr_credit <= 1) {
+ if (delay++ > PR_WAIT_TIMEOUT) {
+ dev_err(dev, "maximum try\n");
+ return -ETIMEDOUT;
+ }
+ udelay(1);
+
+ pr_status = readq(fme_pr + FME_PR_STS);
+ pr_credit = FIELD_GET(FME_PR_STS_PR_CREDIT, pr_status);
+ }
+
+ if (count >= 4) {
+ pr_data = 0;
+ pr_data |= FIELD_PREP(FME_PR_DATA_PR_DATA_RAW,
+ *(((u32 *)buf) + i));
+ writeq(pr_data, fme_pr + FME_PR_DATA);
+ count -= 4;
+ pr_credit--;
+ i++;
+ } else {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int fme_mgr_write_complete(struct fpga_manager *mgr,
+ struct fpga_image_info *info)
+{
+ struct device *dev = &mgr->dev;
+ struct fme_mgr_priv *priv = mgr->priv;
+ void __iomem *fme_pr = priv->ioaddr;
+ u64 pr_ctrl;
+
+ pr_ctrl = readq(fme_pr + FME_PR_CTRL);
+ pr_ctrl |= FME_PR_CTRL_PR_COMPLETE;
+ writeq(pr_ctrl, fme_pr + FME_PR_CTRL);
+
+ dev_dbg(dev, "green bitstream push complete\n");
+ dev_dbg(dev, "waiting for HW to release PR resource\n");
+
+ if (readq_poll_timeout(fme_pr + FME_PR_CTRL, pr_ctrl,
+ !(pr_ctrl & FME_PR_CTRL_PR_START), 1,
+ PR_WAIT_TIMEOUT)) {
+ dev_err(dev, "maximum try.\n");
+ return -ETIMEDOUT;
+ }
+
+ dev_dbg(dev, "PR operation complete, checking status\n");
+ priv->pr_error = fme_mgr_pr_error_handle(fme_pr);
+ if (priv->pr_error) {
+ dev_dbg(dev, "PR error detected %llx\n",
+ (unsigned long long)priv->pr_error);
+ return -EIO;
+ }
+
+ dev_dbg(dev, "PR done successfully\n");
+
+ return 0;
+}
+
+static enum fpga_mgr_states fme_mgr_state(struct fpga_manager *mgr)
+{
+ return FPGA_MGR_STATE_UNKNOWN;
+}
+
+static u64 fme_mgr_status(struct fpga_manager *mgr)
+{
+ struct fme_mgr_priv *priv = mgr->priv;
+
+ return pr_error_to_mgr_status(priv->pr_error);
+}
+
+static const struct fpga_manager_ops fme_mgr_ops = {
+ .write_init = fme_mgr_write_init,
+ .write = fme_mgr_write,
+ .write_complete = fme_mgr_write_complete,
+ .state = fme_mgr_state,
+ .status = fme_mgr_status,
+};
+
+static int fme_mgr_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct fme_mgr_priv *priv;
+ struct fpga_manager *mgr;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->ioaddr = devm_ioremap(dev, res->start, resource_size(res));
+ if (IS_ERR(priv->ioaddr))
+ return PTR_ERR(priv->ioaddr);
+
+ ret = sysfs_create_files(&pdev->dev.kobj, fme_mgr_attrs);
+ if (ret)
+ return ret;
+
+ mgr = devm_kzalloc(dev, sizeof(*mgr), GFP_KERNEL);
+ if (!mgr)
+ goto sysfs_remove_exit;
+
+ mgr->name = "DFL FPGA Manager";
+ mgr->mops = &fme_mgr_ops;
+ mgr->priv = priv;
+ mgr->parent = dev;
+ platform_set_drvdata(pdev, mgr);
+
+ ret = fpga_mgr_register(mgr);
+ if (ret) {
+ dev_err(dev, "unable to register FPGA manager\n");
+ goto sysfs_remove_exit;
+ }
+
+ return 0;
+
+sysfs_remove_exit:
+ sysfs_remove_files(&pdev->dev.kobj, fme_mgr_attrs);
+ return ret;
+}
+
+static int fme_mgr_remove(struct platform_device *pdev)
+{
+ struct fpga_manager *mgr = platform_get_drvdata(pdev);
+
+ fpga_mgr_unregister(mgr);
+ sysfs_remove_files(&pdev->dev.kobj, fme_mgr_attrs);
+
+ return 0;
+}
+
+static struct platform_driver fme_mgr_driver = {
+ .driver = {
+ .name = FPGA_DFL_FME_MGR,
+ },
+ .probe = fme_mgr_probe,
+ .remove = fme_mgr_remove,
+};
+
+module_platform_driver(fme_mgr_driver);
+
+MODULE_DESCRIPTION("FPGA Manager for FPGA Management Engine");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:fpga-dfl-fme-mgr");
diff --git a/drivers/fpga/fpga-dfl.h b/drivers/fpga/fpga-dfl.h
index e5a1094..d45eb82 100644
--- a/drivers/fpga/fpga-dfl.h
+++ b/drivers/fpga/fpga-dfl.h
@@ -130,7 +130,44 @@

/* FME Partial Reconfiguration Sub Feature Register Set */
#define FME_PR_DFH DFH
-#define FME_PR_SIZE DFH_SIZE
+#define FME_PR_CTRL 0x8
+#define FME_PR_STS 0x10
+#define FME_PR_DATA 0x18
+#define FME_PR_ERR 0x20
+#define FME_PR_INTFC_ID_H 0xA8
+#define FME_PR_INTFC_ID_L 0xB0
+#define FME_PR_SIZE 0xB8
+
+/* FME PR Control Register Bitfield */
+#define FME_PR_CTRL_PR_RST BIT(0) /* Reset PR engine */
+#define FME_PR_CTRL_PR_RSTACK BIT(4) /* Ack for PR engine reset */
+#define FME_PR_CTRL_PR_RGN_ID GENMASK_ULL(9, 7) /* PR Region ID */
+#define FME_PR_CTRL_PR_START BIT(12) /* Start to request for PR service */
+#define FME_PR_CTRL_PR_COMPLETE BIT(13) /* PR data push complete notification */
+
+/* FME PR Status Register Bitfield */
+/* Number of available entries in HW queue inside the PR engine. */
+#define FME_PR_STS_PR_CREDIT GENMASK_ULL(8, 0)
+#define FME_PR_STS_PR_STS BIT(16) /* PR operation status */
+#define FME_PR_STS_PR_STS_IDLE 0
+#define FME_PR_STS_PR_CTRLR_STS GENMASK_ULL(22, 20) /* Controller status */
+#define FME_PR_STS_PR_HOST_STS GENMASK_ULL(27, 24) /* PR host status */
+
+/* FME PR Data Register Bitfield */
+/* PR data from the raw-binary file. */
+#define FME_PR_DATA_PR_DATA_RAW GENMASK_ULL(32, 0)
+
+/* FME PR Error Register */
+/* Previous PR Operation errors detected. */
+#define FME_PR_ERR_OPERATION_ERR BIT(0)
+/* CRC error detected. */
+#define FME_PR_ERR_CRC_ERR BIT(1)
+/* Incompatible PR bitstream detected. */
+#define FME_PR_ERR_INCOMPATIBLE_BS BIT(2)
+/* PR data push protocol violated. */
+#define FME_PR_ERR_PROTOCOL_ERR BIT(3)
+/* PR data fifo overflow error detected */
+#define FME_PR_ERR_FIFO_OVERFLOW BIT(4)

/* FME HSSI Sub Feature Register Set */
#define FME_HSSI_DFH DFH
--
1.8.3.1
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