Hi Hao, On Mon, Jun 26, 2017 at 09:52:11AM +0800, Wu Hao wrote: > This patch adds fpga manager driver for Intel FPGA Management > Engine(FME). It implements fpga_manager_ops for FPGA Partial > Reconfiguration function. > > Signed-off-by: Tim Whisonant > Signed-off-by: Enno Luebbers > Signed-off-by: Shiva Rao > Signed-off-by: Christopher Rauer > Signed-off-by: Kang Luwei > Signed-off-by: Xiao Guangrong > Signed-off-by: Wu Hao > --- > .../ABI/testing/sysfs-platform-intel-fpga-fme-mgr | 8 + > drivers/fpga/Kconfig | 7 + > drivers/fpga/Makefile | 1 + > drivers/fpga/intel-feature-dev.h | 75 +++++ > drivers/fpga/intel-fpga-fme-mgr.c | 307 +++++++++++++++++++++ > 5 files changed, 398 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr > create mode 100644 drivers/fpga/intel-fpga-fme-mgr.c > > diff --git a/Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr b/Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr > new file mode 100644 > index 0000000..40771fb > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-platform-intel-fpga-fme-mgr > @@ -0,0 +1,8 @@ > +What: /sys/bus/platform/devices/intel-fpga-fme-mgr.0/interface_id > +Date: June 2017 > +KernelVersion: 4.12 > +Contact: Wu Hao > +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 b91458f..6f2f623 100644 > --- a/drivers/fpga/Kconfig > +++ b/drivers/fpga/Kconfig > @@ -151,6 +151,13 @@ config INTEL_FPGA_FME > all FPGA platform level management features. There shall be 1 > FME per Intel FPGA. > > +config INTEL_FPGA_FME_MGR > + tristate "Intel FPGA FME Manager Driver" > + depends on INTEL_FPGA_FME > + help > + Say Y to enable FPGA Manager driver for Intel FPGA Management > + Engine. > + > endif > > endif # FPGA > diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile > index acda5ca..d1d588b 100644 > --- a/drivers/fpga/Makefile > +++ b/drivers/fpga/Makefile > @@ -31,6 +31,7 @@ obj-$(CONFIG_OF_FPGA_REGION) += of-fpga-region.o > # Intel FPGA Support > obj-$(CONFIG_INTEL_FPGA_PCI) += intel-fpga-pci.o > obj-$(CONFIG_INTEL_FPGA_FME) += intel-fpga-fme.o > +obj-$(CONFIG_INTEL_FPGA_FME_MGR) += intel-fpga-fme-mgr.o > > intel-fpga-pci-objs := intel-pcie.o intel-feature-dev.o > intel-fpga-fme-objs := intel-fme-main.o intel-fme-pr.o > diff --git a/drivers/fpga/intel-feature-dev.h b/drivers/fpga/intel-feature-dev.h > index 3f97b75..f33923b 100644 > --- a/drivers/fpga/intel-feature-dev.h > +++ b/drivers/fpga/intel-feature-dev.h > @@ -164,8 +164,83 @@ struct feature_fme_err { > }; > > /* FME Partial Reconfiguration Sub Feature Register Set */ > +/* FME PR Control Register */ > +struct feature_fme_pr_ctl { > + union { > + u64 csr; > + struct { > + u64 pr_reset:1; /* Reset PR Engine */ > + u64 rsvdz1:3; > + u64 pr_reset_ack:1; /* Reset PR Engine Ack */ > + u64 rsvdz2:3; > + u64 pr_regionid:2; /* PR Region ID */ > + u64 rsvdz3:2; > + u64 pr_start_req:1; /* PR Start Request */ > + u64 pr_push_complete:1; /* PR Data push complete */ > + u64 pr_kind:1; /* Load Customer or Intel GBS */ > + u64 rsvdz4:17; > + u64 config_data:32; > + }; > + }; > +}; > + > +/* FME PR Status Register */ > +struct feature_fme_pr_status { > + union { > + u64 csr; > + struct { > + u64 pr_credit:9; /* Number of PR Credits */ > + u64 rsvdz1:7; > + u64 pr_status:1; /* PR Operation status */ > + u64 rsvdz2:3; > + u64 pr_ctrlr_status:3; /* Controller status */ > + u64 rsvdz3:1; > + u64 pr_host_status:4; /* PR Host status */ > + u64 rsvdz4:36; > + }; > + }; > +}; > + > +/* FME PR Data Register */ > +struct feature_fme_pr_data { > + union { > + u64 csr; > + struct { > + /* PR data from the raw-binary file */ > + u64 pr_data_raw:32; > + u64 rsvd:32; > + }; > + }; > +}; > + > +/* FME PR Error Register */ > +struct feature_fme_pr_error { > + union { > + u64 csr; > + struct { > + u64 operation_err:1; /* Previous PR error detected */ > + u64 crc_err:1; /* CRC error detected */ > + u64 incompatiable_bs:1; /* Incompatiable Bitstream */ > + u64 protocol_err:1; /* Data push protocol error */ > + u64 fifo_overflow:1; /* Data fifo overflow */ > + u64 rsvdz1:1; > + u64 secure_load_err:1; /* Secure PR load error */ > + u64 rsvdz2:57; > + }; > + }; > +}; From what I've seen [1], [2] people weren't too happy with using bitfields, any reason we can't use explicit masking and shifts? I don't know if this is still an issue. > + > struct feature_fme_pr { > struct feature_header header; > + struct feature_fme_pr_ctl control; > + struct feature_fme_pr_status status; > + struct feature_fme_pr_data data; > + struct feature_fme_pr_error error; > + > + u64 rsvd[16]; > + > + u64 intfc_id_l; /* PR interface Id Low */ > + u64 intfc_id_h; /* PR interface Id High */ > }; > > /* PORT Header Register Set */ > diff --git a/drivers/fpga/intel-fpga-fme-mgr.c b/drivers/fpga/intel-fpga-fme-mgr.c > new file mode 100644 > index 0000000..5f93dfb > --- /dev/null > +++ b/drivers/fpga/intel-fpga-fme-mgr.c > @@ -0,0 +1,307 @@ > +/* > + * FPGA Manager Driver for Intel FPGA Management Engine (FME) > + * > + * Copyright (C) 2017 Intel Corporation, Inc. > + * > + * Authors: > + * Kang Luwei > + * Xiao Guangrong > + * Wu Hao > + * Joseph Grecco > + * Enno Luebbers > + * Tim Whisonant > + * Ananda Ravuri > + * Christopher Rauer > + * Henry Mitchel > + * > + * This work is licensed under the terms of the GNU GPL version 2. See > + * the COPYING file in the top-level directory. > + */ > + > +#include > +#include > +#include > + > +#include "intel-feature-dev.h" > +#include "intel-fme.h" > + > +#define PR_WAIT_TIMEOUT 8000000 > +#define PR_HOST_STATUS_IDLE 0 > + > +struct fme_mgr_priv { > + void __iomem *ioaddr; > +}; > + > +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; > + struct feature_fme_pr *fme_pr; > + u64 intfc_id_l, intfc_id_h; > + > + fme_pr = priv->ioaddr; > + > + intfc_id_l = readq(&fme_pr->intfc_id_l); > + intfc_id_h = readq(&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 void fme_mgr_pr_update_status(struct fpga_manager *mgr, > + struct feature_fme_pr_error err) > +{ > + mgr->status = 0; > + > + if (err.operation_err) > + mgr->status |= FPGA_MGR_STATUS_OPERATION_ERR; Can we just have a (err & FEATURE_FME_PR_ERROR) here instead ? > + if (err.crc_err) > + mgr->status |= FPGA_MGR_STATUS_CRC_ERR; Can we just have a (err & FEATURE_FME_CRC_ERROR) here instead ? > + if (err.incompatiable_bs) > + mgr->status |= FPGA_MGR_STATUS_INCOMPATIBLE_BS_ERR; > + if (err.protocol_err) > + mgr->status |= FPGA_MGR_STATUS_IP_PROTOCOL_ERR; > + if (err.fifo_overflow) > + mgr->status |= FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR; > + if (err.secure_load_err) > + mgr->status |= FPGA_MGR_STATUS_SECURE_LOAD_ERR; > +} > + > +static u64 fme_mgr_pr_err_handle(struct feature_fme_pr *fme_pr) > +{ > + struct feature_fme_pr_status fme_pr_status; > + struct feature_fme_pr_error fme_pr_error; > + > + fme_pr_status.csr = readq(&fme_pr->status); > + if (!fme_pr_status.pr_status) > + return 0; > + > + fme_pr_error.csr = readq(&fme_pr->error); > + writeq(fme_pr_error.csr, &fme_pr->error); > + > + return fme_pr_error.csr; > +} > + > +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; > + struct feature_fme_pr *fme_pr = priv->ioaddr; > + struct feature_fme_pr_ctl fme_pr_ctl; > + struct feature_fme_pr_status fme_pr_status; > + struct feature_fme_pr_error fme_pr_err; > + > + 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"); > + > + fme_pr_ctl.csr = readq(&fme_pr->control); > + fme_pr_ctl.pr_reset = 1; > + writeq(fme_pr_ctl.csr, &fme_pr->control); > + > + if (readq_poll_timeout(&fme_pr->control, fme_pr_ctl.csr, > + (fme_pr_ctl.pr_reset_ack == 1), > + 1, PR_WAIT_TIMEOUT)) { > + dev_err(dev, "maximum PR timeout\n"); > + return -ETIMEDOUT; > + } > + > + fme_pr_ctl.csr = readq(&fme_pr->control); > + fme_pr_ctl.pr_reset = 0; > + writeq(fme_pr_ctl.csr, &fme_pr->control); > + > + dev_dbg(dev, > + "waiting for PR resource in HW to be initialized and ready\n"); > + > + fme_pr_status.pr_host_status = PR_HOST_STATUS_IDLE; > + > + if (readq_poll_timeout(&fme_pr->status, fme_pr_status.csr, > + (fme_pr_status.pr_host_status == PR_HOST_STATUS_IDLE), > + 1, PR_WAIT_TIMEOUT)) { > + dev_err(dev, "maximum PR timeout\n"); > + return -ETIMEDOUT; > + } > + > + dev_dbg(dev, "check and clear previous PR error\n"); > + fme_pr_err.csr = fme_mgr_pr_err_handle(fme_pr); > + if (fme_pr_err.csr) > + dev_dbg(dev, "previous PR error detected %llx\n", > + (unsigned long long)fme_pr_err.csr); > + > + /* Clear all PR errors */ > + fme_pr_err.csr = 0; > + fme_mgr_pr_update_status(mgr, fmCRCe_pr_err); > + > + dev_dbg(dev, "set PR port ID\n"); > + > + fme_pr_ctl.csr = readq(&fme_pr->control); > + fme_pr_ctl.pr_regionid = info->region_id; > + writeq(fme_pr_ctl.csr, &fme_pr->control); > + > + 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; > + struct feature_fme_pr *fme_pr = priv->ioaddr; > + struct feature_fme_pr_ctl fme_pr_ctl; > + struct feature_fme_pr_status fme_pr_status; > + struct feature_fme_pr_data fme_pr_data; > + int delay, pr_credit, i = 0; > + > + dev_dbg(dev, "start request\n"); > + > + fme_pr_ctl.csr = readq(&fme_pr->control); > + fme_pr_ctl.pr_start_req = 1; > + writeq(fme_pr_ctl.csr, &fme_pr->control); > + > + dev_dbg(dev, "pushing data from bitstream to HW\n"); > + > + fme_pr_status.csr = readq(&fme_pr->status); > + pr_credit = fme_pr_status.pr_credit; > + > + while (count > 0) { > + delay = 0; > + while (pr_credit <= 1) { > + if (delay++ > PR_WAIT_TIMEOUT) { > + dev_err(dev, "maximum try\n"); > + return -ETIMEDOUT; > + } > + udelay(1); > + > + fme_pr_status.csr = readq(&fme_pr->status); > + pr_credit = fme_pr_status.pr_credit; > + }; > + > + if (count >= 4) { > + fme_pr_data.rsvd = 0; > + fme_pr_data.pr_data_raw = *(((u32 *)buf) + i); > + writeq(fme_pr_data.csr, &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; > + struct feature_fme_pr *fme_pr = priv->ioaddr; > + struct feature_fme_pr_ctl fme_pr_ctl; > + struct feature_fme_pr_error fme_pr_err; > + > + fme_pr_ctl.csr = readq(&fme_pr->control); > + fme_pr_ctl.pr_push_complete = 1; > + writeq(fme_pr_ctl.csr, &fme_pr->control); > + > + dev_dbg(dev, "green bitstream push complete\n"); > + dev_dbg(dev, "waiting for HW to release PR resource\n"); > + > + fme_pr_ctl.pr_start_req = 0; > + > + if (readq_poll_timeout(&fme_pr->control, fme_pr_ctl.csr, > + (fme_pr_ctl.pr_start_req == 0), > + 1, PR_WAIT_TIMEOUT)) { > + dev_err(dev, "maximum try.\n"); > + return -ETIMEDOUT; > + } > + > + dev_dbg(dev, "PR operation complete, checking status\n"); > + fme_pr_err.csr = fme_mgr_pr_err_handle(fme_pr); > + if (fme_pr_err.csr) { > + fme_mgr_pr_update_status(mgr, fme_pr_err); > + 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 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, > +}; > + > +static int fme_mgr_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct fme_mgr_priv *priv; > + 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; > + > + ret = fpga_mgr_register(dev, "Intel FPGA Manager", &fme_mgr_ops, priv); > + if (ret) { > + dev_err(dev, "unable to register FPGA manager\n"); > + sysfs_remove_files(&pdev->dev.kobj, fme_mgr_attrs); > + return ret; > + } > + > + return 0; > +} > + > +static int fme_mgr_remove(struct platform_device *pdev) > +{ > + fpga_mgr_unregister(&pdev->dev); > + sysfs_remove_files(&pdev->dev.kobj, fme_mgr_attrs); > + > + return 0; > +} > + > +static struct platform_driver fme_mgr_driver = { > + .driver = { > + .name = INTEL_FPGA_FME_MGR, > + }, > + .probe = fme_mgr_probe, > + .remove = fme_mgr_remove, > +}; > + > +module_platform_driver(fme_mgr_driver); > + > +MODULE_DESCRIPTION("FPGA Manager for Intel FPGA Management Engine"); > +MODULE_AUTHOR("Intel Corporation"); > +MODULE_LICENSE("GPL v2"); > +MODULE_ALIAS("platform:intel-fpga-fme-mgr"); > -- > 1.8.3.1 > [1] http://yarchive.net/comp/linux/bitfields.html [2] https://lwn.net/Articles/478657/ Thanks, Moritz