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This interface will eventually provide basic functionality in the event that there are any issues with the network interface. Add support for allocating the MSI-X vectors and setting up the BAR mapping. With this we can start enabling various subsystems and start brining up additional interfaces such the AXI fabric and the firmware mailbox. Signed-off-by: Alexander Duyck --- drivers/net/ethernet/meta/fbnic/Makefile | 4 + drivers/net/ethernet/meta/fbnic/fbnic.h | 27 +++++++ drivers/net/ethernet/meta/fbnic/fbnic_devlink.c | 84 +++++++++++++++++++++++ drivers/net/ethernet/meta/fbnic/fbnic_irq.c | 39 +++++++++++ drivers/net/ethernet/meta/fbnic/fbnic_pci.c | 72 +++++++++++++++++++- 5 files changed, 224 insertions(+), 2 deletions(-) create mode 100644 drivers/net/ethernet/meta/fbnic/fbnic_devlink.c create mode 100644 drivers/net/ethernet/meta/fbnic/fbnic_irq.c diff --git a/drivers/net/ethernet/meta/fbnic/Makefile b/drivers/net/ethernet/meta/fbnic/Makefile index ce277fec875f..c06041e70bc5 100644 --- a/drivers/net/ethernet/meta/fbnic/Makefile +++ b/drivers/net/ethernet/meta/fbnic/Makefile @@ -7,4 +7,6 @@ obj-$(CONFIG_FBNIC) += fbnic.o -fbnic-y := fbnic_pci.o +fbnic-y := fbnic_devlink.o \ + fbnic_irq.o \ + fbnic_pci.o diff --git a/drivers/net/ethernet/meta/fbnic/fbnic.h b/drivers/net/ethernet/meta/fbnic/fbnic.h index 25702dab8d66..db85b04e9b80 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic.h +++ b/drivers/net/ethernet/meta/fbnic/fbnic.h @@ -6,8 +6,35 @@ #include "fbnic_csr.h" +struct fbnic_dev { + struct device *dev; + + u32 __iomem *uc_addr0; + u32 __iomem *uc_addr4; + unsigned short num_irqs; + + u64 dsn; +}; + +/* Reserve entry 0 in the MSI-X "others" array until we have filled all + * 32 of the possible interrupt slots. By doing this we can avoid any + * potential conflicts should we need to enable one of the debug interrupt + * causes later. + */ +enum { + FBNIC_NON_NAPI_VECTORS +}; + extern char fbnic_driver_name[]; +void fbnic_devlink_free(struct fbnic_dev *fbd); +struct fbnic_dev *fbnic_devlink_alloc(struct pci_dev *pdev); +void fbnic_devlink_register(struct fbnic_dev *fbd); +void fbnic_devlink_unregister(struct fbnic_dev *fbd); + +void fbnic_free_irqs(struct fbnic_dev *fbd); +int fbnic_alloc_irqs(struct fbnic_dev *fbd); + enum fbnic_boards { fbnic_board_asic }; diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_devlink.c b/drivers/net/ethernet/meta/fbnic/fbnic_devlink.c new file mode 100644 index 000000000000..91e8135410df --- /dev/null +++ b/drivers/net/ethernet/meta/fbnic/fbnic_devlink.c @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) Meta Platforms, Inc. and affiliates. */ + +#include +#include +#include +#include + +#include "fbnic.h" + +#define FBNIC_SN_STR_LEN 24 + +static int fbnic_devlink_info_get(struct devlink *devlink, + struct devlink_info_req *req, + struct netlink_ext_ack *extack) +{ + struct fbnic_dev *fbd = devlink_priv(devlink); + int err; + + if (fbd->dsn) { + unsigned char serial[FBNIC_SN_STR_LEN]; + u8 dsn[8]; + + put_unaligned_be64(fbd->dsn, dsn); + err = snprintf(serial, FBNIC_SN_STR_LEN, "%8phD", dsn); + if (err < 0) + return err; + + err = devlink_info_serial_number_put(req, serial); + if (err) + return err; + } + + return 0; +} + +static const struct devlink_ops fbnic_devlink_ops = { + .info_get = fbnic_devlink_info_get, +}; + +void fbnic_devlink_free(struct fbnic_dev *fbd) +{ + struct devlink *devlink = priv_to_devlink(fbd); + + devlink_free(devlink); +} + +struct fbnic_dev *fbnic_devlink_alloc(struct pci_dev *pdev) +{ + void __iomem * const *iomap_table; + struct devlink *devlink; + struct fbnic_dev *fbd; + + devlink = devlink_alloc(&fbnic_devlink_ops, sizeof(struct fbnic_dev), + &pdev->dev); + if (!devlink) + return NULL; + + fbd = devlink_priv(devlink); + pci_set_drvdata(pdev, fbd); + fbd->dev = &pdev->dev; + + iomap_table = pcim_iomap_table(pdev); + fbd->uc_addr0 = iomap_table[0]; + fbd->uc_addr4 = iomap_table[4]; + + fbd->dsn = pci_get_dsn(pdev); + + return fbd; +} + +void fbnic_devlink_register(struct fbnic_dev *fbd) +{ + struct devlink *devlink = priv_to_devlink(fbd); + + devlink_register(devlink); +} + +void fbnic_devlink_unregister(struct fbnic_dev *fbd) +{ + struct devlink *devlink = priv_to_devlink(fbd); + + devlink_unregister(devlink); +} diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_irq.c b/drivers/net/ethernet/meta/fbnic/fbnic_irq.c new file mode 100644 index 000000000000..7d1475750b64 --- /dev/null +++ b/drivers/net/ethernet/meta/fbnic/fbnic_irq.c @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) Meta Platforms, Inc. and affiliates. */ + +#include +#include + +#include "fbnic.h" + +void fbnic_free_irqs(struct fbnic_dev *fbd) +{ + struct pci_dev *pdev = to_pci_dev(fbd->dev); + + fbd->num_irqs = 0; + + pci_free_irq_vectors(pdev); +} + +int fbnic_alloc_irqs(struct fbnic_dev *fbd) +{ + unsigned int wanted_irqs = FBNIC_NON_NAPI_VECTORS; + struct pci_dev *pdev = to_pci_dev(fbd->dev); + int num_irqs; + + wanted_irqs += 1; + num_irqs = pci_alloc_irq_vectors(pdev, FBNIC_NON_NAPI_VECTORS + 1, + wanted_irqs, PCI_IRQ_MSIX); + if (num_irqs < 0) { + dev_err(fbd->dev, "Failed to allocate MSI-X entries\n"); + return num_irqs; + } + + if (num_irqs < wanted_irqs) + dev_warn(fbd->dev, "Allocated %d IRQs, expected %d\n", + num_irqs, wanted_irqs); + + fbd->num_irqs = num_irqs; + + return 0; +} diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c index e860ec3750c3..185a4d2e6c52 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c @@ -43,6 +43,7 @@ MODULE_DEVICE_TABLE(pci, fbnic_pci_tbl); static int fbnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { const struct fbnic_info *info = fbnic_info_tbl[ent->driver_data]; + struct fbnic_dev *fbd; int err; if (pdev->error_state != pci_channel_io_normal) { @@ -72,10 +73,41 @@ static int fbnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) return err; } + fbd = fbnic_devlink_alloc(pdev); + if (!fbd) { + dev_err(&pdev->dev, "Devlink allocation failed\n"); + return -ENOMEM; + } + pci_set_master(pdev); pci_save_state(pdev); + fbnic_devlink_register(fbd); + + err = fbnic_alloc_irqs(fbd); + if (err) + goto free_fbd; + + if (!fbd->dsn) { + dev_warn(&pdev->dev, "Reading serial number failed\n"); + goto init_failure_mode; + } + return 0; + +init_failure_mode: + dev_warn(&pdev->dev, "Probe error encountered, entering init failure mode. Normal networking functionality will not be available.\n"); + /* Always return 0 even on error so devlink is registered to allow + * firmware updates for fixes. + */ + return 0; +free_fbd: + pci_disable_device(pdev); + + fbnic_devlink_unregister(fbd); + fbnic_devlink_free(fbd); + + return err; } /** @@ -88,16 +120,49 @@ static int fbnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) **/ static void fbnic_remove(struct pci_dev *pdev) { + struct fbnic_dev *fbd = pci_get_drvdata(pdev); + + fbnic_free_irqs(fbd); + + fbnic_devlink_unregister(fbd); + fbnic_devlink_free(fbd); } static int fbnic_pm_suspend(struct device *dev) { + struct fbnic_dev *fbd = dev_get_drvdata(dev); + + /* Free the IRQs so they aren't trying to occupy sleeping CPUs */ + fbnic_free_irqs(fbd); + + /* Hardware is about to go away, so switch off MMIO access internally */ + WRITE_ONCE(fbd->uc_addr0, NULL); + WRITE_ONCE(fbd->uc_addr4, NULL); + return 0; } static int __fbnic_pm_resume(struct device *dev) { + struct fbnic_dev *fbd = dev_get_drvdata(dev); + void __iomem * const *iomap_table; + int err; + + /* Restore MMIO access */ + iomap_table = pcim_iomap_table(to_pci_dev(dev)); + fbd->uc_addr0 = iomap_table[0]; + fbd->uc_addr4 = iomap_table[4]; + + /* Rerequest the IRQs */ + err = fbnic_alloc_irqs(fbd); + if (err) + goto err_invalidate_uc_addr; + return 0; +err_invalidate_uc_addr: + WRITE_ONCE(fbd->uc_addr0, NULL); + WRITE_ONCE(fbd->uc_addr4, NULL); + return err; } static int __maybe_unused fbnic_pm_resume(struct device *dev) @@ -133,6 +198,8 @@ static pci_ers_result_t fbnic_err_error_detected(struct pci_dev *pdev, static pci_ers_result_t fbnic_err_slot_reset(struct pci_dev *pdev) { + int err; + pci_set_power_state(pdev, PCI_D0); pci_restore_state(pdev); pci_save_state(pdev); @@ -143,7 +210,10 @@ static pci_ers_result_t fbnic_err_slot_reset(struct pci_dev *pdev) return PCI_ERS_RESULT_DISCONNECT; } - return PCI_ERS_RESULT_RECOVERED; + /* Restore device to previous state */ + err = __fbnic_pm_resume(&pdev->dev); + + return err ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED; } static void fbnic_err_resume(struct pci_dev *pdev)