| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Serge Semin | 10082 | 99.89% | 9 | 75.00% |
| Bhumika Goyal | 8 | 0.08% | 1 | 8.33% |
| Gustavo A. R. Silva | 2 | 0.02% | 1 | 8.33% |
| Wolfram Sang | 1 | 0.01% | 1 | 8.33% |
| Total | 10093 | 12 |
/* * This file is provided under a GPLv2 license. When using or * redistributing this file, you may do so under that license. * * GPL LICENSE SUMMARY * * Copyright (C) 2016-2018 T-Platforms JSC All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, one can be found http://www.gnu.org/licenses/. * * The full GNU General Public License is included in this distribution in * the file called "COPYING". * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * IDT PCIe-switch NTB Linux driver * * Contact Information: * Serge Semin <fancer.lancer@gmail.com>, <Sergey.Semin@t-platforms.ru> */ #include <linux/stddef.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/bitops.h> #include <linux/sizes.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/mutex.h> #include <linux/pci.h> #include <linux/aer.h> #include <linux/slab.h> #include <linux/list.h> #include <linux/debugfs.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/ntb.h> #include "ntb_hw_idt.h" #define NTB_NAME "ntb_hw_idt" #define NTB_DESC "IDT PCI-E Non-Transparent Bridge Driver" #define NTB_VER "2.0" #define NTB_IRQNAME "ntb_irq_idt" MODULE_DESCRIPTION(NTB_DESC); MODULE_VERSION(NTB_VER); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("T-platforms"); /* * NT Endpoint registers table simplifying a loop access to the functionally * related registers */ static const struct idt_ntb_regs ntdata_tbl = { { {IDT_NT_BARSETUP0, IDT_NT_BARLIMIT0, IDT_NT_BARLTBASE0, IDT_NT_BARUTBASE0}, {IDT_NT_BARSETUP1, IDT_NT_BARLIMIT1, IDT_NT_BARLTBASE1, IDT_NT_BARUTBASE1}, {IDT_NT_BARSETUP2, IDT_NT_BARLIMIT2, IDT_NT_BARLTBASE2, IDT_NT_BARUTBASE2}, {IDT_NT_BARSETUP3, IDT_NT_BARLIMIT3, IDT_NT_BARLTBASE3, IDT_NT_BARUTBASE3}, {IDT_NT_BARSETUP4, IDT_NT_BARLIMIT4, IDT_NT_BARLTBASE4, IDT_NT_BARUTBASE4}, {IDT_NT_BARSETUP5, IDT_NT_BARLIMIT5, IDT_NT_BARLTBASE5, IDT_NT_BARUTBASE5} }, { {IDT_NT_INMSG0, IDT_NT_OUTMSG0, IDT_NT_INMSGSRC0}, {IDT_NT_INMSG1, IDT_NT_OUTMSG1, IDT_NT_INMSGSRC1}, {IDT_NT_INMSG2, IDT_NT_OUTMSG2, IDT_NT_INMSGSRC2}, {IDT_NT_INMSG3, IDT_NT_OUTMSG3, IDT_NT_INMSGSRC3} } }; /* * NT Endpoint ports data table with the corresponding pcie command, link * status, control and BAR-related registers */ static const struct idt_ntb_port portdata_tbl[IDT_MAX_NR_PORTS] = { /*0*/ { IDT_SW_NTP0_PCIECMDSTS, IDT_SW_NTP0_PCIELCTLSTS, IDT_SW_NTP0_NTCTL, IDT_SW_SWPORT0CTL, IDT_SW_SWPORT0STS, { {IDT_SW_NTP0_BARSETUP0, IDT_SW_NTP0_BARLIMIT0, IDT_SW_NTP0_BARLTBASE0, IDT_SW_NTP0_BARUTBASE0}, {IDT_SW_NTP0_BARSETUP1, IDT_SW_NTP0_BARLIMIT1, IDT_SW_NTP0_BARLTBASE1, IDT_SW_NTP0_BARUTBASE1}, {IDT_SW_NTP0_BARSETUP2, IDT_SW_NTP0_BARLIMIT2, IDT_SW_NTP0_BARLTBASE2, IDT_SW_NTP0_BARUTBASE2}, {IDT_SW_NTP0_BARSETUP3, IDT_SW_NTP0_BARLIMIT3, IDT_SW_NTP0_BARLTBASE3, IDT_SW_NTP0_BARUTBASE3}, {IDT_SW_NTP0_BARSETUP4, IDT_SW_NTP0_BARLIMIT4, IDT_SW_NTP0_BARLTBASE4, IDT_SW_NTP0_BARUTBASE4}, {IDT_SW_NTP0_BARSETUP5, IDT_SW_NTP0_BARLIMIT5, IDT_SW_NTP0_BARLTBASE5, IDT_SW_NTP0_BARUTBASE5} } }, /*1*/ {0}, /*2*/ { IDT_SW_NTP2_PCIECMDSTS, IDT_SW_NTP2_PCIELCTLSTS, IDT_SW_NTP2_NTCTL, IDT_SW_SWPORT2CTL, IDT_SW_SWPORT2STS, { {IDT_SW_NTP2_BARSETUP0, IDT_SW_NTP2_BARLIMIT0, IDT_SW_NTP2_BARLTBASE0, IDT_SW_NTP2_BARUTBASE0}, {IDT_SW_NTP2_BARSETUP1, IDT_SW_NTP2_BARLIMIT1, IDT_SW_NTP2_BARLTBASE1, IDT_SW_NTP2_BARUTBASE1}, {IDT_SW_NTP2_BARSETUP2, IDT_SW_NTP2_BARLIMIT2, IDT_SW_NTP2_BARLTBASE2, IDT_SW_NTP2_BARUTBASE2}, {IDT_SW_NTP2_BARSETUP3, IDT_SW_NTP2_BARLIMIT3, IDT_SW_NTP2_BARLTBASE3, IDT_SW_NTP2_BARUTBASE3}, {IDT_SW_NTP2_BARSETUP4, IDT_SW_NTP2_BARLIMIT4, IDT_SW_NTP2_BARLTBASE4, IDT_SW_NTP2_BARUTBASE4}, {IDT_SW_NTP2_BARSETUP5, IDT_SW_NTP2_BARLIMIT5, IDT_SW_NTP2_BARLTBASE5, IDT_SW_NTP2_BARUTBASE5} } }, /*3*/ {0}, /*4*/ { IDT_SW_NTP4_PCIECMDSTS, IDT_SW_NTP4_PCIELCTLSTS, IDT_SW_NTP4_NTCTL, IDT_SW_SWPORT4CTL, IDT_SW_SWPORT4STS, { {IDT_SW_NTP4_BARSETUP0, IDT_SW_NTP4_BARLIMIT0, IDT_SW_NTP4_BARLTBASE0, IDT_SW_NTP4_BARUTBASE0}, {IDT_SW_NTP4_BARSETUP1, IDT_SW_NTP4_BARLIMIT1, IDT_SW_NTP4_BARLTBASE1, IDT_SW_NTP4_BARUTBASE1}, {IDT_SW_NTP4_BARSETUP2, IDT_SW_NTP4_BARLIMIT2, IDT_SW_NTP4_BARLTBASE2, IDT_SW_NTP4_BARUTBASE2}, {IDT_SW_NTP4_BARSETUP3, IDT_SW_NTP4_BARLIMIT3, IDT_SW_NTP4_BARLTBASE3, IDT_SW_NTP4_BARUTBASE3}, {IDT_SW_NTP4_BARSETUP4, IDT_SW_NTP4_BARLIMIT4, IDT_SW_NTP4_BARLTBASE4, IDT_SW_NTP4_BARUTBASE4}, {IDT_SW_NTP4_BARSETUP5, IDT_SW_NTP4_BARLIMIT5, IDT_SW_NTP4_BARLTBASE5, IDT_SW_NTP4_BARUTBASE5} } }, /*5*/ {0}, /*6*/ { IDT_SW_NTP6_PCIECMDSTS, IDT_SW_NTP6_PCIELCTLSTS, IDT_SW_NTP6_NTCTL, IDT_SW_SWPORT6CTL, IDT_SW_SWPORT6STS, { {IDT_SW_NTP6_BARSETUP0, IDT_SW_NTP6_BARLIMIT0, IDT_SW_NTP6_BARLTBASE0, IDT_SW_NTP6_BARUTBASE0}, {IDT_SW_NTP6_BARSETUP1, IDT_SW_NTP6_BARLIMIT1, IDT_SW_NTP6_BARLTBASE1, IDT_SW_NTP6_BARUTBASE1}, {IDT_SW_NTP6_BARSETUP2, IDT_SW_NTP6_BARLIMIT2, IDT_SW_NTP6_BARLTBASE2, IDT_SW_NTP6_BARUTBASE2}, {IDT_SW_NTP6_BARSETUP3, IDT_SW_NTP6_BARLIMIT3, IDT_SW_NTP6_BARLTBASE3, IDT_SW_NTP6_BARUTBASE3}, {IDT_SW_NTP6_BARSETUP4, IDT_SW_NTP6_BARLIMIT4, IDT_SW_NTP6_BARLTBASE4, IDT_SW_NTP6_BARUTBASE4}, {IDT_SW_NTP6_BARSETUP5, IDT_SW_NTP6_BARLIMIT5, IDT_SW_NTP6_BARLTBASE5, IDT_SW_NTP6_BARUTBASE5} } }, /*7*/ {0}, /*8*/ { IDT_SW_NTP8_PCIECMDSTS, IDT_SW_NTP8_PCIELCTLSTS, IDT_SW_NTP8_NTCTL, IDT_SW_SWPORT8CTL, IDT_SW_SWPORT8STS, { {IDT_SW_NTP8_BARSETUP0, IDT_SW_NTP8_BARLIMIT0, IDT_SW_NTP8_BARLTBASE0, IDT_SW_NTP8_BARUTBASE0}, {IDT_SW_NTP8_BARSETUP1, IDT_SW_NTP8_BARLIMIT1, IDT_SW_NTP8_BARLTBASE1, IDT_SW_NTP8_BARUTBASE1}, {IDT_SW_NTP8_BARSETUP2, IDT_SW_NTP8_BARLIMIT2, IDT_SW_NTP8_BARLTBASE2, IDT_SW_NTP8_BARUTBASE2}, {IDT_SW_NTP8_BARSETUP3, IDT_SW_NTP8_BARLIMIT3, IDT_SW_NTP8_BARLTBASE3, IDT_SW_NTP8_BARUTBASE3}, {IDT_SW_NTP8_BARSETUP4, IDT_SW_NTP8_BARLIMIT4, IDT_SW_NTP8_BARLTBASE4, IDT_SW_NTP8_BARUTBASE4}, {IDT_SW_NTP8_BARSETUP5, IDT_SW_NTP8_BARLIMIT5, IDT_SW_NTP8_BARLTBASE5, IDT_SW_NTP8_BARUTBASE5} } }, /*9*/ {0}, /*10*/ {0}, /*11*/ {0}, /*12*/ { IDT_SW_NTP12_PCIECMDSTS, IDT_SW_NTP12_PCIELCTLSTS, IDT_SW_NTP12_NTCTL, IDT_SW_SWPORT12CTL, IDT_SW_SWPORT12STS, { {IDT_SW_NTP12_BARSETUP0, IDT_SW_NTP12_BARLIMIT0, IDT_SW_NTP12_BARLTBASE0, IDT_SW_NTP12_BARUTBASE0}, {IDT_SW_NTP12_BARSETUP1, IDT_SW_NTP12_BARLIMIT1, IDT_SW_NTP12_BARLTBASE1, IDT_SW_NTP12_BARUTBASE1}, {IDT_SW_NTP12_BARSETUP2, IDT_SW_NTP12_BARLIMIT2, IDT_SW_NTP12_BARLTBASE2, IDT_SW_NTP12_BARUTBASE2}, {IDT_SW_NTP12_BARSETUP3, IDT_SW_NTP12_BARLIMIT3, IDT_SW_NTP12_BARLTBASE3, IDT_SW_NTP12_BARUTBASE3}, {IDT_SW_NTP12_BARSETUP4, IDT_SW_NTP12_BARLIMIT4, IDT_SW_NTP12_BARLTBASE4, IDT_SW_NTP12_BARUTBASE4}, {IDT_SW_NTP12_BARSETUP5, IDT_SW_NTP12_BARLIMIT5, IDT_SW_NTP12_BARLTBASE5, IDT_SW_NTP12_BARUTBASE5} } }, /*13*/ {0}, /*14*/ {0}, /*15*/ {0}, /*16*/ { IDT_SW_NTP16_PCIECMDSTS, IDT_SW_NTP16_PCIELCTLSTS, IDT_SW_NTP16_NTCTL, IDT_SW_SWPORT16CTL, IDT_SW_SWPORT16STS, { {IDT_SW_NTP16_BARSETUP0, IDT_SW_NTP16_BARLIMIT0, IDT_SW_NTP16_BARLTBASE0, IDT_SW_NTP16_BARUTBASE0}, {IDT_SW_NTP16_BARSETUP1, IDT_SW_NTP16_BARLIMIT1, IDT_SW_NTP16_BARLTBASE1, IDT_SW_NTP16_BARUTBASE1}, {IDT_SW_NTP16_BARSETUP2, IDT_SW_NTP16_BARLIMIT2, IDT_SW_NTP16_BARLTBASE2, IDT_SW_NTP16_BARUTBASE2}, {IDT_SW_NTP16_BARSETUP3, IDT_SW_NTP16_BARLIMIT3, IDT_SW_NTP16_BARLTBASE3, IDT_SW_NTP16_BARUTBASE3}, {IDT_SW_NTP16_BARSETUP4, IDT_SW_NTP16_BARLIMIT4, IDT_SW_NTP16_BARLTBASE4, IDT_SW_NTP16_BARUTBASE4}, {IDT_SW_NTP16_BARSETUP5, IDT_SW_NTP16_BARLIMIT5, IDT_SW_NTP16_BARLTBASE5, IDT_SW_NTP16_BARUTBASE5} } }, /*17*/ {0}, /*18*/ {0}, /*19*/ {0}, /*20*/ { IDT_SW_NTP20_PCIECMDSTS, IDT_SW_NTP20_PCIELCTLSTS, IDT_SW_NTP20_NTCTL, IDT_SW_SWPORT20CTL, IDT_SW_SWPORT20STS, { {IDT_SW_NTP20_BARSETUP0, IDT_SW_NTP20_BARLIMIT0, IDT_SW_NTP20_BARLTBASE0, IDT_SW_NTP20_BARUTBASE0}, {IDT_SW_NTP20_BARSETUP1, IDT_SW_NTP20_BARLIMIT1, IDT_SW_NTP20_BARLTBASE1, IDT_SW_NTP20_BARUTBASE1}, {IDT_SW_NTP20_BARSETUP2, IDT_SW_NTP20_BARLIMIT2, IDT_SW_NTP20_BARLTBASE2, IDT_SW_NTP20_BARUTBASE2}, {IDT_SW_NTP20_BARSETUP3, IDT_SW_NTP20_BARLIMIT3, IDT_SW_NTP20_BARLTBASE3, IDT_SW_NTP20_BARUTBASE3}, {IDT_SW_NTP20_BARSETUP4, IDT_SW_NTP20_BARLIMIT4, IDT_SW_NTP20_BARLTBASE4, IDT_SW_NTP20_BARUTBASE4}, {IDT_SW_NTP20_BARSETUP5, IDT_SW_NTP20_BARLIMIT5, IDT_SW_NTP20_BARLTBASE5, IDT_SW_NTP20_BARUTBASE5} } }, /*21*/ {0}, /*22*/ {0}, /*23*/ {0} }; /* * IDT PCIe-switch partitions table with the corresponding control, status * and messages control registers */ static const struct idt_ntb_part partdata_tbl[IDT_MAX_NR_PARTS] = { /*0*/ { IDT_SW_SWPART0CTL, IDT_SW_SWPART0STS, {IDT_SW_SWP0MSGCTL0, IDT_SW_SWP0MSGCTL1, IDT_SW_SWP0MSGCTL2, IDT_SW_SWP0MSGCTL3} }, /*1*/ { IDT_SW_SWPART1CTL, IDT_SW_SWPART1STS, {IDT_SW_SWP1MSGCTL0, IDT_SW_SWP1MSGCTL1, IDT_SW_SWP1MSGCTL2, IDT_SW_SWP1MSGCTL3} }, /*2*/ { IDT_SW_SWPART2CTL, IDT_SW_SWPART2STS, {IDT_SW_SWP2MSGCTL0, IDT_SW_SWP2MSGCTL1, IDT_SW_SWP2MSGCTL2, IDT_SW_SWP2MSGCTL3} }, /*3*/ { IDT_SW_SWPART3CTL, IDT_SW_SWPART3STS, {IDT_SW_SWP3MSGCTL0, IDT_SW_SWP3MSGCTL1, IDT_SW_SWP3MSGCTL2, IDT_SW_SWP3MSGCTL3} }, /*4*/ { IDT_SW_SWPART4CTL, IDT_SW_SWPART4STS, {IDT_SW_SWP4MSGCTL0, IDT_SW_SWP4MSGCTL1, IDT_SW_SWP4MSGCTL2, IDT_SW_SWP4MSGCTL3} }, /*5*/ { IDT_SW_SWPART5CTL, IDT_SW_SWPART5STS, {IDT_SW_SWP5MSGCTL0, IDT_SW_SWP5MSGCTL1, IDT_SW_SWP5MSGCTL2, IDT_SW_SWP5MSGCTL3} }, /*6*/ { IDT_SW_SWPART6CTL, IDT_SW_SWPART6STS, {IDT_SW_SWP6MSGCTL0, IDT_SW_SWP6MSGCTL1, IDT_SW_SWP6MSGCTL2, IDT_SW_SWP6MSGCTL3} }, /*7*/ { IDT_SW_SWPART7CTL, IDT_SW_SWPART7STS, {IDT_SW_SWP7MSGCTL0, IDT_SW_SWP7MSGCTL1, IDT_SW_SWP7MSGCTL2, IDT_SW_SWP7MSGCTL3} } }; /* * DebugFS directory to place the driver debug file */ static struct dentry *dbgfs_topdir; /*============================================================================= * 1. IDT PCIe-switch registers IO-functions * * Beside ordinary configuration space registers IDT PCIe-switch expose * global configuration registers, which are used to determine state of other * device ports as well as being notified of some switch-related events. * Additionally all the configuration space registers of all the IDT * PCIe-switch functions are mapped to the Global Address space, so each * function can determine a configuration of any other PCI-function. * Functions declared in this chapter are created to encapsulate access * to configuration and global registers, so the driver code just need to * provide IDT NTB hardware descriptor and a register address. *============================================================================= */ /* * idt_nt_write() - PCI configuration space registers write method * @ndev: IDT NTB hardware driver descriptor * @reg: Register to write data to * @data: Value to write to the register * * IDT PCIe-switch registers are all Little endian. */ static void idt_nt_write(struct idt_ntb_dev *ndev, const unsigned int reg, const u32 data) { /* * It's obvious bug to request a register exceeding the maximum possible * value as well as to have it unaligned. */ if (WARN_ON(reg > IDT_REG_PCI_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN))) return; /* Just write the value to the specified register */ iowrite32(data, ndev->cfgspc + (ptrdiff_t)reg); } /* * idt_nt_read() - PCI configuration space registers read method * @ndev: IDT NTB hardware driver descriptor * @reg: Register to write data to * * IDT PCIe-switch Global configuration registers are all Little endian. * * Return: register value */ static u32 idt_nt_read(struct idt_ntb_dev *ndev, const unsigned int reg) { /* * It's obvious bug to request a register exceeding the maximum possible * value as well as to have it unaligned. */ if (WARN_ON(reg > IDT_REG_PCI_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN))) return ~0; /* Just read the value from the specified register */ return ioread32(ndev->cfgspc + (ptrdiff_t)reg); } /* * idt_sw_write() - Global registers write method * @ndev: IDT NTB hardware driver descriptor * @reg: Register to write data to * @data: Value to write to the register * * IDT PCIe-switch Global configuration registers are all Little endian. */ static void idt_sw_write(struct idt_ntb_dev *ndev, const unsigned int reg, const u32 data) { unsigned long irqflags; /* * It's obvious bug to request a register exceeding the maximum possible * value as well as to have it unaligned. */ if (WARN_ON(reg > IDT_REG_SW_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN))) return; /* Lock GASA registers operations */ spin_lock_irqsave(&ndev->gasa_lock, irqflags); /* Set the global register address */ iowrite32((u32)reg, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASAADDR); /* Put the new value of the register */ iowrite32(data, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASADATA); /* Make sure the PCIe transactions are executed */ mmiowb(); /* Unlock GASA registers operations */ spin_unlock_irqrestore(&ndev->gasa_lock, irqflags); } /* * idt_sw_read() - Global registers read method * @ndev: IDT NTB hardware driver descriptor * @reg: Register to write data to * * IDT PCIe-switch Global configuration registers are all Little endian. * * Return: register value */ static u32 idt_sw_read(struct idt_ntb_dev *ndev, const unsigned int reg) { unsigned long irqflags; u32 data; /* * It's obvious bug to request a register exceeding the maximum possible * value as well as to have it unaligned. */ if (WARN_ON(reg > IDT_REG_SW_MAX || !IS_ALIGNED(reg, IDT_REG_ALIGN))) return ~0; /* Lock GASA registers operations */ spin_lock_irqsave(&ndev->gasa_lock, irqflags); /* Set the global register address */ iowrite32((u32)reg, ndev->cfgspc + (ptrdiff_t)IDT_NT_GASAADDR); /* Get the data of the register (read ops acts as MMIO barrier) */ data = ioread32(ndev->cfgspc + (ptrdiff_t)IDT_NT_GASADATA); /* Unlock GASA registers operations */ spin_unlock_irqrestore(&ndev->gasa_lock, irqflags); return data; } /* * idt_reg_set_bits() - set bits of a passed register * @ndev: IDT NTB hardware driver descriptor * @reg: Register to change bits of * @reg_lock: Register access spin lock * @valid_mask: Mask of valid bits * @set_bits: Bitmask to set * * Helper method to check whether a passed bitfield is valid and set * corresponding bits of a register. * * WARNING! Make sure the passed register isn't accessed over plane * idt_nt_write() method (read method is ok to be used concurrently). * * Return: zero on success, negative error on invalid bitmask. */ static inline int idt_reg_set_bits(struct idt_ntb_dev *ndev, unsigned int reg, spinlock_t *reg_lock, u64 valid_mask, u64 set_bits) { unsigned long irqflags; u32 data; if (set_bits & ~(u64)valid_mask) return -EINVAL; /* Lock access to the register unless the change is written back */ spin_lock_irqsave(reg_lock, irqflags); data = idt_nt_read(ndev, reg) | (u32)set_bits; idt_nt_write(ndev, reg, data); /* Unlock the register */ spin_unlock_irqrestore(reg_lock, irqflags); return 0; } /* * idt_reg_clear_bits() - clear bits of a passed register * @ndev: IDT NTB hardware driver descriptor * @reg: Register to change bits of * @reg_lock: Register access spin lock * @set_bits: Bitmask to clear * * Helper method to check whether a passed bitfield is valid and clear * corresponding bits of a register. * * NOTE! Invalid bits are always considered cleared so it's not an error * to clear them over. * * WARNING! Make sure the passed register isn't accessed over plane * idt_nt_write() method (read method is ok to use concurrently). */ static inline void idt_reg_clear_bits(struct idt_ntb_dev *ndev, unsigned int reg, spinlock_t *reg_lock, u64 clear_bits) { unsigned long irqflags; u32 data; /* Lock access to the register unless the change is written back */ spin_lock_irqsave(reg_lock, irqflags); data = idt_nt_read(ndev, reg) & ~(u32)clear_bits; idt_nt_write(ndev, reg, data); /* Unlock the register */ spin_unlock_irqrestore(reg_lock, irqflags); } /*=========================================================================== * 2. Ports operations * * IDT PCIe-switches can have from 3 up to 8 ports with possible * NT-functions enabled. So all the possible ports need to be scanned looking * for NTB activated. NTB API will have enumerated only the ports with NTB. *=========================================================================== */ /* * idt_scan_ports() - scan IDT PCIe-switch ports collecting info in the tables * @ndev: Pointer to the PCI device descriptor * * Return: zero on success, otherwise a negative error number. */ static int idt_scan_ports(struct idt_ntb_dev *ndev) { unsigned char pidx, port, part; u32 data, portsts, partsts; /* Retrieve the local port number */ data = idt_nt_read(ndev, IDT_NT_PCIELCAP); ndev->port = GET_FIELD(PCIELCAP_PORTNUM, data); /* Retrieve the local partition number */ portsts = idt_sw_read(ndev, portdata_tbl[ndev->port].sts); ndev->part = GET_FIELD(SWPORTxSTS_SWPART, portsts); /* Initialize port/partition -> index tables with invalid values */ memset(ndev->port_idx_map, -EINVAL, sizeof(ndev->port_idx_map)); memset(ndev->part_idx_map, -EINVAL, sizeof(ndev->part_idx_map)); /* * Walk over all the possible ports checking whether any of them has * NT-function activated */ ndev->peer_cnt = 0; for (pidx = 0; pidx < ndev->swcfg->port_cnt; pidx++) { port = ndev->swcfg->ports[pidx]; /* Skip local port */ if (port == ndev->port) continue; /* Read the port status register to get it partition */ portsts = idt_sw_read(ndev, portdata_tbl[port].sts); part = GET_FIELD(SWPORTxSTS_SWPART, portsts); /* Retrieve the partition status */ partsts = idt_sw_read(ndev, partdata_tbl[part].sts); /* Check if partition state is active and port has NTB */ if (IS_FLD_SET(SWPARTxSTS_STATE, partsts, ACT) && (IS_FLD_SET(SWPORTxSTS_MODE, portsts, NT) || IS_FLD_SET(SWPORTxSTS_MODE, portsts, USNT) || IS_FLD_SET(SWPORTxSTS_MODE, portsts, USNTDMA) || IS_FLD_SET(SWPORTxSTS_MODE, portsts, NTDMA))) { /* Save the port and partition numbers */ ndev->peers[ndev->peer_cnt].port = port; ndev->peers[ndev->peer_cnt].part = part; /* Fill in the port/partition -> index tables */ ndev->port_idx_map[port] = ndev->peer_cnt; ndev->part_idx_map[part] = ndev->peer_cnt; ndev->peer_cnt++; } } dev_dbg(&ndev->ntb.pdev->dev, "Local port: %hhu, num of peers: %hhu\n", ndev->port, ndev->peer_cnt); /* It's useless to have this driver loaded if there is no any peer */ if (ndev->peer_cnt == 0) { dev_warn(&ndev->ntb.pdev->dev, "No active peer found\n"); return -ENODEV; } return 0; } /* * idt_ntb_port_number() - get the local port number * @ntb: NTB device context. * * Return: the local port number */ static int idt_ntb_port_number(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return ndev->port; } /* * idt_ntb_peer_port_count() - get the number of peer ports * @ntb: NTB device context. * * Return the count of detected peer NT-functions. * * Return: number of peer ports */ static int idt_ntb_peer_port_count(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return ndev->peer_cnt; } /* * idt_ntb_peer_port_number() - get peer port by given index * @ntb: NTB device context. * @pidx: Peer port index. * * Return: peer port or negative error */ static int idt_ntb_peer_port_number(struct ntb_dev *ntb, int pidx) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); if (pidx < 0 || ndev->peer_cnt <= pidx) return -EINVAL; /* Return the detected NT-function port number */ return ndev->peers[pidx].port; } /* * idt_ntb_peer_port_idx() - get peer port index by given port number * @ntb: NTB device context. * @port: Peer port number. * * Internal port -> index table is pre-initialized with -EINVAL values, * so we just need to return it value * * Return: peer NT-function port index or negative error */ static int idt_ntb_peer_port_idx(struct ntb_dev *ntb, int port) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); if (port < 0 || IDT_MAX_NR_PORTS <= port) return -EINVAL; return ndev->port_idx_map[port]; } /*=========================================================================== * 3. Link status operations * There is no any ready-to-use method to have peer ports notified if NTB * link is set up or got down. Instead global signal can be used instead. * In case if any one of ports changes local NTB link state, it sends * global signal and clears corresponding global state bit. Then all the ports * receive a notification of that, so to make client driver being aware of * possible NTB link change. * Additionally each of active NT-functions is subscribed to PCIe-link * state changes of peer ports. *=========================================================================== */ static void idt_ntb_local_link_disable(struct idt_ntb_dev *ndev); /* * idt_init_link() - Initialize NTB link state notification subsystem * @ndev: IDT NTB hardware driver descriptor * * Function performs the basic initialization of some global registers * needed to enable IRQ-based notifications of PCIe Link Up/Down and * Global Signal events. * NOTE Since it's not possible to determine when all the NTB peer drivers are * unloaded as well as have those registers accessed concurrently, we must * preinitialize them with the same value and leave it uncleared on local * driver unload. */ static void idt_init_link(struct idt_ntb_dev *ndev) { u32 part_mask, port_mask, se_mask; unsigned char pidx; /* Initialize spin locker of Mapping Table access registers */ spin_lock_init(&ndev->mtbl_lock); /* Walk over all detected peers collecting port and partition masks */ port_mask = ~BIT(ndev->port); part_mask = ~BIT(ndev->part); for (pidx = 0; pidx < ndev->peer_cnt; pidx++) { port_mask &= ~BIT(ndev->peers[pidx].port); part_mask &= ~BIT(ndev->peers[pidx].part); } /* Clean the Link Up/Down and GLobal Signal status registers */ idt_sw_write(ndev, IDT_SW_SELINKUPSTS, (u32)-1); idt_sw_write(ndev, IDT_SW_SELINKDNSTS, (u32)-1); idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)-1); /* Unmask NT-activated partitions to receive Global Switch events */ idt_sw_write(ndev, IDT_SW_SEPMSK, part_mask); /* Enable PCIe Link Up events of NT-activated ports */ idt_sw_write(ndev, IDT_SW_SELINKUPMSK, port_mask); /* Enable PCIe Link Down events of NT-activated ports */ idt_sw_write(ndev, IDT_SW_SELINKDNMSK, port_mask); /* Unmask NT-activated partitions to receive Global Signal events */ idt_sw_write(ndev, IDT_SW_SEGSIGMSK, part_mask); /* Unmask Link Up/Down and Global Switch Events */ se_mask = ~(IDT_SEMSK_LINKUP | IDT_SEMSK_LINKDN | IDT_SEMSK_GSIGNAL); idt_sw_write(ndev, IDT_SW_SEMSK, se_mask); dev_dbg(&ndev->ntb.pdev->dev, "NTB link status events initialized"); } /* * idt_deinit_link() - deinitialize link subsystem * @ndev: IDT NTB hardware driver descriptor * * Just disable the link back. */ static void idt_deinit_link(struct idt_ntb_dev *ndev) { /* Disable the link */ idt_ntb_local_link_disable(ndev); dev_dbg(&ndev->ntb.pdev->dev, "NTB link status events deinitialized"); } /* * idt_se_isr() - switch events ISR * @ndev: IDT NTB hardware driver descriptor * @ntint_sts: NT-function interrupt status * * This driver doesn't support IDT PCIe-switch dynamic reconfigurations, * Failover capability, etc, so switch events are utilized to notify of * PCIe and NTB link events. * The method is called from PCIe ISR bottom-half routine. */ static void idt_se_isr(struct idt_ntb_dev *ndev, u32 ntint_sts) { u32 sests; /* Read Switch Events status */ sests = idt_sw_read(ndev, IDT_SW_SESTS); /* Clean the Link Up/Down and Global Signal status registers */ idt_sw_write(ndev, IDT_SW_SELINKUPSTS, (u32)-1); idt_sw_write(ndev, IDT_SW_SELINKDNSTS, (u32)-1); idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)-1); /* Clean the corresponding interrupt bit */ idt_nt_write(ndev, IDT_NT_NTINTSTS, IDT_NTINTSTS_SEVENT); dev_dbg(&ndev->ntb.pdev->dev, "SE IRQ detected %#08x (SESTS %#08x)", ntint_sts, sests); /* Notify the client driver of possible link state change */ ntb_link_event(&ndev->ntb); } /* * idt_ntb_local_link_enable() - enable the local NTB link. * @ndev: IDT NTB hardware driver descriptor * * In order to enable the NTB link we need: * - enable Completion TLPs translation * - initialize mapping table to enable the Request ID translation * - notify peers of NTB link state change */ static void idt_ntb_local_link_enable(struct idt_ntb_dev *ndev) { u32 reqid, mtbldata = 0; unsigned long irqflags; /* Enable the ID protection and Completion TLPs translation */ idt_nt_write(ndev, IDT_NT_NTCTL, IDT_NTCTL_CPEN); /* Retrieve the current Requester ID (Bus:Device:Function) */ reqid = idt_nt_read(ndev, IDT_NT_REQIDCAP); /* * Set the corresponding NT Mapping table entry of port partition index * with the data to perform the Request ID translation */ mtbldata = SET_FIELD(NTMTBLDATA_REQID, 0, reqid) | SET_FIELD(NTMTBLDATA_PART, 0, ndev->part) | IDT_NTMTBLDATA_VALID; spin_lock_irqsave(&ndev->mtbl_lock, irqflags); idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part); idt_nt_write(ndev, IDT_NT_NTMTBLDATA, mtbldata); mmiowb(); spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags); /* Notify the peers by setting and clearing the global signal bit */ idt_nt_write(ndev, IDT_NT_NTGSIGNAL, IDT_NTGSIGNAL_SET); idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)1 << ndev->part); } /* * idt_ntb_local_link_disable() - disable the local NTB link. * @ndev: IDT NTB hardware driver descriptor * * In order to enable the NTB link we need: * - disable Completion TLPs translation * - clear corresponding mapping table entry * - notify peers of NTB link state change */ static void idt_ntb_local_link_disable(struct idt_ntb_dev *ndev) { unsigned long irqflags; /* Disable Completion TLPs translation */ idt_nt_write(ndev, IDT_NT_NTCTL, 0); /* Clear the corresponding NT Mapping table entry */ spin_lock_irqsave(&ndev->mtbl_lock, irqflags); idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part); idt_nt_write(ndev, IDT_NT_NTMTBLDATA, 0); mmiowb(); spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags); /* Notify the peers by setting and clearing the global signal bit */ idt_nt_write(ndev, IDT_NT_NTGSIGNAL, IDT_NTGSIGNAL_SET); idt_sw_write(ndev, IDT_SW_SEGSIGSTS, (u32)1 << ndev->part); } /* * idt_ntb_local_link_is_up() - test wethter local NTB link is up * @ndev: IDT NTB hardware driver descriptor * * Local link is up under the following conditions: * - Bus mastering is enabled * - NTCTL has Completion TLPs translation enabled * - Mapping table permits Request TLPs translation * NOTE: We don't need to check PCIe link state since it's obviously * up while we are able to communicate with IDT PCIe-switch * * Return: true if link is up, otherwise false */ static bool idt_ntb_local_link_is_up(struct idt_ntb_dev *ndev) { unsigned long irqflags; u32 data; /* Read the local Bus Master Enable status */ data = idt_nt_read(ndev, IDT_NT_PCICMDSTS); if (!(data & IDT_PCICMDSTS_BME)) return false; /* Read the local Completion TLPs translation enable status */ data = idt_nt_read(ndev, IDT_NT_NTCTL); if (!(data & IDT_NTCTL_CPEN)) return false; /* Read Mapping table entry corresponding to the local partition */ spin_lock_irqsave(&ndev->mtbl_lock, irqflags); idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->part); data = idt_nt_read(ndev, IDT_NT_NTMTBLDATA); spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags); return !!(data & IDT_NTMTBLDATA_VALID); } /* * idt_ntb_peer_link_is_up() - test whether peer NTB link is up * @ndev: IDT NTB hardware driver descriptor * @pidx: Peer port index * * Peer link is up under the following conditions: * - PCIe link is up * - Bus mastering is enabled * - NTCTL has Completion TLPs translation enabled * - Mapping table permits Request TLPs translation * * Return: true if link is up, otherwise false */ static bool idt_ntb_peer_link_is_up(struct idt_ntb_dev *ndev, int pidx) { unsigned long irqflags; unsigned char port; u32 data; /* Retrieve the device port number */ port = ndev->peers[pidx].port; /* Check whether PCIe link is up */ data = idt_sw_read(ndev, portdata_tbl[port].sts); if (!(data & IDT_SWPORTxSTS_LINKUP)) return false; /* Check whether bus mastering is enabled on the peer port */ data = idt_sw_read(ndev, portdata_tbl[port].pcicmdsts); if (!(data & IDT_PCICMDSTS_BME)) return false; /* Check if Completion TLPs translation is enabled on the peer port */ data = idt_sw_read(ndev, portdata_tbl[port].ntctl); if (!(data & IDT_NTCTL_CPEN)) return false; /* Read Mapping table entry corresponding to the peer partition */ spin_lock_irqsave(&ndev->mtbl_lock, irqflags); idt_nt_write(ndev, IDT_NT_NTMTBLADDR, ndev->peers[pidx].part); data = idt_nt_read(ndev, IDT_NT_NTMTBLDATA); spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags); return !!(data & IDT_NTMTBLDATA_VALID); } /* * idt_ntb_link_is_up() - get the current ntb link state (NTB API callback) * @ntb: NTB device context. * @speed: OUT - The link speed expressed as PCIe generation number. * @width: OUT - The link width expressed as the number of PCIe lanes. * * Get the bitfield of NTB link states for all peer ports * * Return: bitfield of indexed ports link state: bit is set/cleared if the * link is up/down respectively. */ static u64 idt_ntb_link_is_up(struct ntb_dev *ntb, enum ntb_speed *speed, enum ntb_width *width) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); unsigned char pidx; u64 status; u32 data; /* Retrieve the local link speed and width */ if (speed != NULL || width != NULL) { data = idt_nt_read(ndev, IDT_NT_PCIELCTLSTS); if (speed != NULL) *speed = GET_FIELD(PCIELCTLSTS_CLS, data); if (width != NULL) *width = GET_FIELD(PCIELCTLSTS_NLW, data); } /* If local NTB link isn't up then all the links are considered down */ if (!idt_ntb_local_link_is_up(ndev)) return 0; /* Collect all the peer ports link states into the bitfield */ status = 0; for (pidx = 0; pidx < ndev->peer_cnt; pidx++) { if (idt_ntb_peer_link_is_up(ndev, pidx)) status |= ((u64)1 << pidx); } return status; } /* * idt_ntb_link_enable() - enable local port ntb link (NTB API callback) * @ntb: NTB device context. * @max_speed: The maximum link speed expressed as PCIe generation number. * @max_width: The maximum link width expressed as the number of PCIe lanes. * * Enable just local NTB link. PCIe link parameters are ignored. * * Return: always zero. */ static int idt_ntb_link_enable(struct ntb_dev *ntb, enum ntb_speed speed, enum ntb_width width) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); /* Just enable the local NTB link */ idt_ntb_local_link_enable(ndev); dev_dbg(&ndev->ntb.pdev->dev, "Local NTB link enabled"); return 0; } /* * idt_ntb_link_disable() - disable local port ntb link (NTB API callback) * @ntb: NTB device context. * * Disable just local NTB link. * * Return: always zero. */ static int idt_ntb_link_disable(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); /* Just disable the local NTB link */ idt_ntb_local_link_disable(ndev); dev_dbg(&ndev->ntb.pdev->dev, "Local NTB link disabled"); return 0; } /*============================================================================= * 4. Memory Window operations * * IDT PCIe-switches have two types of memory windows: MWs with direct * address translation and MWs with LUT based translation. The first type of * MWs is simple map of corresponding BAR address space to a memory space * of specified target port. So it implemets just ont-to-one mapping. Lookup * table in its turn can map one BAR address space to up to 24 different * memory spaces of different ports. * NT-functions BARs can be turned on to implement either direct or lookup * table based address translations, so: * BAR0 - NT configuration registers space/direct address translation * BAR1 - direct address translation/upper address of BAR0x64 * BAR2 - direct address translation/Lookup table with either 12 or 24 entries * BAR3 - direct address translation/upper address of BAR2x64 * BAR4 - direct address translation/Lookup table with either 12 or 24 entries * BAR5 - direct address translation/upper address of BAR4x64 * Additionally BAR2 and BAR4 can't have 24-entries LUT enabled at the same * time. Since the BARs setup can be rather complicated this driver implements * a scanning algorithm to have all the possible memory windows configuration * covered. * * NOTE 1 BAR setup must be done before Linux kernel enumerated NT-function * of any port, so this driver would have memory windows configurations fixed. * In this way all initializations must be performed either by platform BIOS * or using EEPROM connected to IDT PCIe-switch master SMBus. * * NOTE 2 This driver expects BAR0 mapping NT-function configuration space. * Easy calculation can give us an upper boundary of 29 possible memory windows * per each NT-function if all the BARs are of 32bit type. *============================================================================= */ /* * idt_get_mw_count() - get memory window count * @mw_type: Memory window type * * Return: number of memory windows with respect to the BAR type */ static inline unsigned char idt_get_mw_count(enum idt_mw_type mw_type) { switch (mw_type) { case IDT_MW_DIR: return 1; case IDT_MW_LUT12: return 12; case IDT_MW_LUT24: return 24; default: break; } return 0; } /* * idt_get_mw_name() - get memory window name * @mw_type: Memory window type * * Return: pointer to a string with name */ static inline char *idt_get_mw_name(enum idt_mw_type mw_type) { switch (mw_type) { case IDT_MW_DIR: return "DIR "; case IDT_MW_LUT12: return "LUT12"; case IDT_MW_LUT24: return "LUT24"; default: break; } return "unknown"; } /* * idt_scan_mws() - scan memory windows of the port * @ndev: IDT NTB hardware driver descriptor * @port: Port to get number of memory windows for * @mw_cnt: Out - number of memory windows * * It walks over BAR setup registers of the specified port and determines * the memory windows parameters if any activated. * * Return: array of memory windows */ static struct idt_mw_cfg *idt_scan_mws(struct idt_ntb_dev *ndev, int port, unsigned char *mw_cnt) { struct idt_mw_cfg mws[IDT_MAX_NR_MWS], *ret_mws; const struct idt_ntb_bar *bars; enum idt_mw_type mw_type; unsigned char widx, bidx, en_cnt; bool bar_64bit = false; int aprt_size; u32 data; /* Retrieve the array of the BARs registers */ bars = portdata_tbl[port].bars; /* Scan all the BARs belonging to the port */ *mw_cnt = 0; for (bidx = 0; bidx < IDT_BAR_CNT; bidx += 1 + bar_64bit) { /* Read BARSETUP register value */ data = idt_sw_read(ndev, bars[bidx].setup); /* Skip disabled BARs */ if (!(data & IDT_BARSETUP_EN)) { bar_64bit = false; continue; } /* Skip next BARSETUP if current one has 64bit addressing */ bar_64bit = IS_FLD_SET(BARSETUP_TYPE, data, 64); /* Skip configuration space mapping BARs */ if (data & IDT_BARSETUP_MODE_CFG) continue; /* Retrieve MW type/entries count and aperture size */ mw_type = GET_FIELD(BARSETUP_ATRAN, data); en_cnt = idt_get_mw_count(mw_type); aprt_size = (u64)1 << GET_FIELD(BARSETUP_SIZE, data); /* Save configurations of all available memory windows */ for (widx = 0; widx < en_cnt; widx++, (*mw_cnt)++) { /* * IDT can expose a limited number of MWs, so it's bug * to have more than the driver expects */ if (*mw_cnt >= IDT_MAX_NR_MWS) return ERR_PTR(-EINVAL); /* Save basic MW info */ mws[*mw_cnt].type = mw_type; mws[*mw_cnt].bar = bidx; mws[*mw_cnt].idx = widx; /* It's always DWORD aligned */ mws[*mw_cnt].addr_align = IDT_TRANS_ALIGN; /* DIR and LUT approachs differently configure MWs */ if (mw_type == IDT_MW_DIR) mws[*mw_cnt].size_max = aprt_size; else if (mw_type == IDT_MW_LUT12) mws[*mw_cnt].size_max = aprt_size / 16; else mws[*mw_cnt].size_max = aprt_size / 32; mws[*mw_cnt].size_align = (mw_type == IDT_MW_DIR) ? IDT_DIR_SIZE_ALIGN : mws[*mw_cnt].size_max; } } /* Allocate memory for memory window descriptors */ ret_mws = devm_kcalloc(&ndev->ntb.pdev->dev, *mw_cnt, sizeof(*ret_mws), GFP_KERNEL); if (!ret_mws) return ERR_PTR(-ENOMEM); /* Copy the info of detected memory windows */ memcpy(ret_mws, mws, (*mw_cnt)*sizeof(*ret_mws)); return ret_mws; } /* * idt_init_mws() - initialize memory windows subsystem * @ndev: IDT NTB hardware driver descriptor * * Scan BAR setup registers of local and peer ports to determine the * outbound and inbound memory windows parameters * * Return: zero on success, otherwise a negative error number */ static int idt_init_mws(struct idt_ntb_dev *ndev) { struct idt_ntb_peer *peer; unsigned char pidx; /* Scan memory windows of the local port */ ndev->mws = idt_scan_mws(ndev, ndev->port, &ndev->mw_cnt); if (IS_ERR(ndev->mws)) { dev_err(&ndev->ntb.pdev->dev, "Failed to scan mws of local port %hhu", ndev->port); return PTR_ERR(ndev->mws); } /* Scan memory windows of the peer ports */ for (pidx = 0; pidx < ndev->peer_cnt; pidx++) { peer = &ndev->peers[pidx]; peer->mws = idt_scan_mws(ndev, peer->port, &peer->mw_cnt); if (IS_ERR(peer->mws)) { dev_err(&ndev->ntb.pdev->dev, "Failed to scan mws of port %hhu", peer->port); return PTR_ERR(peer->mws); } } /* Initialize spin locker of the LUT registers */ spin_lock_init(&ndev->lut_lock); dev_dbg(&ndev->ntb.pdev->dev, "Outbound and inbound MWs initialized"); return 0; } /* * idt_ntb_mw_count() - number of inbound memory windows (NTB API callback) * @ntb: NTB device context. * @pidx: Port index of peer device. * * The value is returned for the specified peer, so generally speaking it can * be different for different port depending on the IDT PCIe-switch * initialization. * * Return: the number of memory windows. */ static int idt_ntb_mw_count(struct ntb_dev *ntb, int pidx) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); if (pidx < 0 || ndev->peer_cnt <= pidx) return -EINVAL; return ndev->peers[pidx].mw_cnt; } /* * idt_ntb_mw_get_align() - inbound memory window parameters (NTB API callback) * @ntb: NTB device context. * @pidx: Port index of peer device. * @widx: Memory window index. * @addr_align: OUT - the base alignment for translating the memory window * @size_align: OUT - the size alignment for translating the memory window * @size_max: OUT - the maximum size of the memory window * * The peer memory window parameters have already been determined, so just * return the corresponding values, which mustn't change within session. * * Return: Zero on success, otherwise a negative error number. */ static int idt_ntb_mw_get_align(struct ntb_dev *ntb, int pidx, int widx, resource_size_t *addr_align, resource_size_t *size_align, resource_size_t *size_max) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); struct idt_ntb_peer *peer; if (pidx < 0 || ndev->peer_cnt <= pidx) return -EINVAL; peer = &ndev->peers[pidx]; if (widx < 0 || peer->mw_cnt <= widx) return -EINVAL; if (addr_align != NULL) *addr_align = peer->mws[widx].addr_align; if (size_align != NULL) *size_align = peer->mws[widx].size_align; if (size_max != NULL) *size_max = peer->mws[widx].size_max; return 0; } /* * idt_ntb_peer_mw_count() - number of outbound memory windows * (NTB API callback) * @ntb: NTB device context. * * Outbound memory windows parameters have been determined based on the * BAR setup registers value, which are mostly constants within one session. * * Return: the number of memory windows. */ static int idt_ntb_peer_mw_count(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return ndev->mw_cnt; } /* * idt_ntb_peer_mw_get_addr() - get map address of an outbound memory window * (NTB API callback) * @ntb: NTB device context. * @widx: Memory window index (within ntb_peer_mw_count() return value). * @base: OUT - the base address of mapping region. * @size: OUT - the size of mapping region. * * Return just parameters of BAR resources mapping. Size reflects just the size * of the resource * * Return: Zero on success, otherwise a negative error number. */ static int idt_ntb_peer_mw_get_addr(struct ntb_dev *ntb, int widx, phys_addr_t *base, resource_size_t *size) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); if (widx < 0 || ndev->mw_cnt <= widx) return -EINVAL; /* Mapping address is just properly shifted BAR resource start */ if (base != NULL) *base = pci_resource_start(ntb->pdev, ndev->mws[widx].bar) + ndev->mws[widx].idx * ndev->mws[widx].size_max; /* Mapping size has already been calculated at MWs scanning */ if (size != NULL) *size = ndev->mws[widx].size_max; return 0; } /* * idt_ntb_peer_mw_set_trans() - set a translation address of a memory window * (NTB API callback) * @ntb: NTB device context. * @pidx: Port index of peer device the translation address received from. * @widx: Memory window index. * @addr: The dma address of the shared memory to access. * @size: The size of the shared memory to access. * * The Direct address translation and LUT base translation is initialized a * bit differenet. Although the parameters restriction are now determined by * the same code. * * Return: Zero on success, otherwise an error number. */ static int idt_ntb_peer_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx, u64 addr, resource_size_t size) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); struct idt_mw_cfg *mw_cfg; u32 data = 0, lutoff = 0; if (pidx < 0 || ndev->peer_cnt <= pidx) return -EINVAL; if (widx < 0 || ndev->mw_cnt <= widx) return -EINVAL; /* * Retrieve the memory window config to make sure the passed arguments * fit it restrictions */ mw_cfg = &ndev->mws[widx]; if (!IS_ALIGNED(addr, mw_cfg->addr_align)) return -EINVAL; if (!IS_ALIGNED(size, mw_cfg->size_align) || size > mw_cfg->size_max) return -EINVAL; /* DIR and LUT based translations are initialized differently */ if (mw_cfg->type == IDT_MW_DIR) { const struct idt_ntb_bar *bar = &ntdata_tbl.bars[mw_cfg->bar]; u64 limit; /* Set destination partition of translation */ data = idt_nt_read(ndev, bar->setup); data = SET_FIELD(BARSETUP_TPART, data, ndev->peers[pidx].part); idt_nt_write(ndev, bar->setup, data); /* Set translation base address */ idt_nt_write(ndev, bar->ltbase, (u32)addr); idt_nt_write(ndev, bar->utbase, (u32)(addr >> 32)); /* Set the custom BAR aperture limit */ limit = pci_bus_address(ntb->pdev, mw_cfg->bar) + size; idt_nt_write(ndev, bar->limit, (u32)limit); if (IS_FLD_SET(BARSETUP_TYPE, data, 64)) idt_nt_write(ndev, (bar + 1)->limit, (limit >> 32)); } else { unsigned long irqflags; /* Initialize corresponding LUT entry */ lutoff = SET_FIELD(LUTOFFSET_INDEX, 0, mw_cfg->idx) | SET_FIELD(LUTOFFSET_BAR, 0, mw_cfg->bar); data = SET_FIELD(LUTUDATA_PART, 0, ndev->peers[pidx].part) | IDT_LUTUDATA_VALID; spin_lock_irqsave(&ndev->lut_lock, irqflags); idt_nt_write(ndev, IDT_NT_LUTOFFSET, lutoff); idt_nt_write(ndev, IDT_NT_LUTLDATA, (u32)addr); idt_nt_write(ndev, IDT_NT_LUTMDATA, (u32)(addr >> 32)); idt_nt_write(ndev, IDT_NT_LUTUDATA, data); mmiowb(); spin_unlock_irqrestore(&ndev->lut_lock, irqflags); /* Limit address isn't specified since size is fixed for LUT */ } return 0; } /* * idt_ntb_peer_mw_clear_trans() - clear the outbound MW translation address * (NTB API callback) * @ntb: NTB device context. * @pidx: Port index of peer device. * @widx: Memory window index. * * It effectively disables the translation over the specified outbound MW. * * Return: Zero on success, otherwise an error number. */ static int idt_ntb_peer_mw_clear_trans(struct ntb_dev *ntb, int pidx, int widx) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); struct idt_mw_cfg *mw_cfg; if (pidx < 0 || ndev->peer_cnt <= pidx) return -EINVAL; if (widx < 0 || ndev->mw_cnt <= widx) return -EINVAL; mw_cfg = &ndev->mws[widx]; /* DIR and LUT based translations are initialized differently */ if (mw_cfg->type == IDT_MW_DIR) { const struct idt_ntb_bar *bar = &ntdata_tbl.bars[mw_cfg->bar]; u32 data; /* Read BARSETUP to check BAR type */ data = idt_nt_read(ndev, bar->setup); /* Disable translation by specifying zero BAR limit */ idt_nt_write(ndev, bar->limit, 0); if (IS_FLD_SET(BARSETUP_TYPE, data, 64)) idt_nt_write(ndev, (bar + 1)->limit, 0); } else { unsigned long irqflags; u32 lutoff; /* Clear the corresponding LUT entry up */ lutoff = SET_FIELD(LUTOFFSET_INDEX, 0, mw_cfg->idx) | SET_FIELD(LUTOFFSET_BAR, 0, mw_cfg->bar); spin_lock_irqsave(&ndev->lut_lock, irqflags); idt_nt_write(ndev, IDT_NT_LUTOFFSET, lutoff); idt_nt_write(ndev, IDT_NT_LUTLDATA, 0); idt_nt_write(ndev, IDT_NT_LUTMDATA, 0); idt_nt_write(ndev, IDT_NT_LUTUDATA, 0); mmiowb(); spin_unlock_irqrestore(&ndev->lut_lock, irqflags); } return 0; } /*============================================================================= * 5. Doorbell operations * * Doorbell functionality of IDT PCIe-switches is pretty unusual. First of * all there is global doorbell register which state can be changed by any * NT-function of the IDT device in accordance with global permissions. These * permissions configs are not supported by NTB API, so it must be done by * either BIOS or EEPROM settings. In the same way the state of the global * doorbell is reflected to the NT-functions local inbound doorbell registers. * It can lead to situations when client driver sets some peer doorbell bits * and get them bounced back to local inbound doorbell if permissions are * granted. * Secondly there is just one IRQ vector for Doorbell, Message, Temperature * and Switch events, so if client driver left any of Doorbell bits set and * some other event occurred, the driver will be notified of Doorbell event * again. *============================================================================= */ /* * idt_db_isr() - doorbell event ISR * @ndev: IDT NTB hardware driver descriptor * @ntint_sts: NT-function interrupt status * * Doorbell event happans when DBELL bit of NTINTSTS switches from 0 to 1. * It happens only when unmasked doorbell bits are set to ones on completely * zeroed doorbell register. * The method is called from PCIe ISR bottom-half routine. */ static void idt_db_isr(struct idt_ntb_dev *ndev, u32 ntint_sts) { /* * Doorbell IRQ status will be cleaned only when client * driver unsets all the doorbell bits. */ dev_dbg(&ndev->ntb.pdev->dev, "DB IRQ detected %#08x", ntint_sts); /* Notify the client driver of possible doorbell state change */ ntb_db_event(&ndev->ntb, 0); } /* * idt_ntb_db_valid_mask() - get a mask of doorbell bits supported by the ntb * (NTB API callback) * @ntb: NTB device context. * * IDT PCIe-switches expose just one Doorbell register of DWORD size. * * Return: A mask of doorbell bits supported by the ntb. */ static u64 idt_ntb_db_valid_mask(struct ntb_dev *ntb) { return IDT_DBELL_MASK; } /* * idt_ntb_db_read() - read the local doorbell register (NTB API callback) * @ntb: NTB device context. * * There is just on inbound doorbell register of each NT-function, so * this method return it value. * * Return: The bits currently set in the local doorbell register. */ static u64 idt_ntb_db_read(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return idt_nt_read(ndev, IDT_NT_INDBELLSTS); } /* * idt_ntb_db_clear() - clear bits in the local doorbell register * (NTB API callback) * @ntb: NTB device context. * @db_bits: Doorbell bits to clear. * * Clear bits of inbound doorbell register by writing ones to it. * * NOTE! Invalid bits are always considered cleared so it's not an error * to clear them over. * * Return: always zero as success. */ static int idt_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); idt_nt_write(ndev, IDT_NT_INDBELLSTS, (u32)db_bits); return 0; } /* * idt_ntb_db_read_mask() - read the local doorbell mask (NTB API callback) * @ntb: NTB device context. * * Each inbound doorbell bit can be masked from generating IRQ by setting * the corresponding bit in inbound doorbell mask. So this method returns * the value of the register. * * Return: The bits currently set in the local doorbell mask register. */ static u64 idt_ntb_db_read_mask(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return idt_nt_read(ndev, IDT_NT_INDBELLMSK); } /* * idt_ntb_db_set_mask() - set bits in the local doorbell mask * (NTB API callback) * @ntb: NTB device context. * @db_bits: Doorbell mask bits to set. * * The inbound doorbell register mask value must be read, then OR'ed with * passed field and only then set back. * * Return: zero on success, negative error if invalid argument passed. */ static int idt_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return idt_reg_set_bits(ndev, IDT_NT_INDBELLMSK, &ndev->db_mask_lock, IDT_DBELL_MASK, db_bits); } /* * idt_ntb_db_clear_mask() - clear bits in the local doorbell mask * (NTB API callback) * @ntb: NTB device context. * @db_bits: Doorbell bits to clear. * * The method just clears the set bits up in accordance with the passed * bitfield. IDT PCIe-switch shall generate an interrupt if there hasn't * been any unmasked bit set before current unmasking. Otherwise IRQ won't * be generated since there is only one IRQ vector for all doorbells. * * Return: always zero as success */ static int idt_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); idt_reg_clear_bits(ndev, IDT_NT_INDBELLMSK, &ndev->db_mask_lock, db_bits); return 0; } /* * idt_ntb_peer_db_set() - set bits in the peer doorbell register * (NTB API callback) * @ntb: NTB device context. * @db_bits: Doorbell bits to set. * * IDT PCIe-switches exposes local outbound doorbell register to change peer * inbound doorbell register state. * * Return: zero on success, negative error if invalid argument passed. */ static int idt_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); if (db_bits & ~(u64)IDT_DBELL_MASK) return -EINVAL; idt_nt_write(ndev, IDT_NT_OUTDBELLSET, (u32)db_bits); return 0; } /*============================================================================= * 6. Messaging operations * * Each NT-function of IDT PCIe-switch has four inbound and four outbound * message registers. Each outbound message register can be connected to one or * even more than one peer inbound message registers by setting global * configurations. Since NTB API permits one-on-one message registers mapping * only, the driver acts in according with that restriction. *============================================================================= */ /* * idt_init_msg() - initialize messaging interface * @ndev: IDT NTB hardware driver descriptor * * Just initialize the message registers routing tables locker. */ static void idt_init_msg(struct idt_ntb_dev *ndev) { unsigned char midx; /* Init the messages routing table lockers */ for (midx = 0; midx < IDT_MSG_CNT; midx++) spin_lock_init(&ndev->msg_locks[midx]); dev_dbg(&ndev->ntb.pdev->dev, "NTB Messaging initialized"); } /* * idt_msg_isr() - message event ISR * @ndev: IDT NTB hardware driver descriptor * @ntint_sts: NT-function interrupt status * * Message event happens when MSG bit of NTINTSTS switches from 0 to 1. * It happens only when unmasked message status bits are set to ones on * completely zeroed message status register. * The method is called from PCIe ISR bottom-half routine. */ static void idt_msg_isr(struct idt_ntb_dev *ndev, u32 ntint_sts) { /* * Message IRQ status will be cleaned only when client * driver unsets all the message status bits. */ dev_dbg(&ndev->ntb.pdev->dev, "Message IRQ detected %#08x", ntint_sts); /* Notify the client driver of possible message status change */ ntb_msg_event(&ndev->ntb); } /* * idt_ntb_msg_count() - get the number of message registers (NTB API callback) * @ntb: NTB device context. * * IDT PCIe-switches support four message registers. * * Return: the number of message registers. */ static int idt_ntb_msg_count(struct ntb_dev *ntb) { return IDT_MSG_CNT; } /* * idt_ntb_msg_inbits() - get a bitfield of inbound message registers status * (NTB API callback) * @ntb: NTB device context. * * NT message status register is shared between inbound and outbound message * registers status * * Return: bitfield of inbound message registers. */ static u64 idt_ntb_msg_inbits(struct ntb_dev *ntb) { return (u64)IDT_INMSG_MASK; } /* * idt_ntb_msg_outbits() - get a bitfield of outbound message registers status * (NTB API callback) * @ntb: NTB device context. * * NT message status register is shared between inbound and outbound message * registers status * * Return: bitfield of outbound message registers. */ static u64 idt_ntb_msg_outbits(struct ntb_dev *ntb) { return (u64)IDT_OUTMSG_MASK; } /* * idt_ntb_msg_read_sts() - read the message registers status (NTB API callback) * @ntb: NTB device context. * * IDT PCIe-switches expose message status registers to notify drivers of * incoming data and failures in case if peer message register isn't freed. * * Return: status bits of message registers */ static u64 idt_ntb_msg_read_sts(struct ntb_dev *ntb) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return idt_nt_read(ndev, IDT_NT_MSGSTS); } /* * idt_ntb_msg_clear_sts() - clear status bits of message registers * (NTB API callback) * @ntb: NTB device context. * @sts_bits: Status bits to clear. * * Clear bits in the status register by writing ones. * * NOTE! Invalid bits are always considered cleared so it's not an error * to clear them over. * * Return: always zero as success. */ static int idt_ntb_msg_clear_sts(struct ntb_dev *ntb, u64 sts_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); idt_nt_write(ndev, IDT_NT_MSGSTS, sts_bits); return 0; } /* * idt_ntb_msg_set_mask() - set mask of message register status bits * (NTB API callback) * @ntb: NTB device context. * @mask_bits: Mask bits. * * Mask the message status bits from raising an IRQ. * * Return: zero on success, negative error if invalid argument passed. */ static int idt_ntb_msg_set_mask(struct ntb_dev *ntb, u64 mask_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); return idt_reg_set_bits(ndev, IDT_NT_MSGSTSMSK, &ndev->msg_mask_lock, IDT_MSG_MASK, mask_bits); } /* * idt_ntb_msg_clear_mask() - clear message registers mask * (NTB API callback) * @ntb: NTB device context. * @mask_bits: Mask bits. * * Clear mask of message status bits IRQs. * * Return: always zero as success. */ static int idt_ntb_msg_clear_mask(struct ntb_dev *ntb, u64 mask_bits) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); idt_reg_clear_bits(ndev, IDT_NT_MSGSTSMSK, &ndev->msg_mask_lock, mask_bits); return 0; } /* * idt_ntb_msg_read() - read message register with specified index * (NTB API callback) * @ntb: NTB device context. * @pidx: OUT - Port index of peer device a message retrieved from * @midx: Message register index * * Read data from the specified message register and source register. * * Return: inbound message register value. */ static u32 idt_ntb_msg_read(struct ntb_dev *ntb, int *pidx, int midx) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); if (midx < 0 || IDT_MSG_CNT <= midx) return ~(u32)0; /* Retrieve source port index of the message */ if (pidx != NULL) { u32 srcpart; srcpart = idt_nt_read(ndev, ntdata_tbl.msgs[midx].src); *pidx = ndev->part_idx_map[srcpart]; /* Sanity check partition index (for initial case) */ if (*pidx == -EINVAL) *pidx = 0; } /* Retrieve data of the corresponding message register */ return idt_nt_read(ndev, ntdata_tbl.msgs[midx].in); } /* * idt_ntb_peer_msg_write() - write data to the specified message register * (NTB API callback) * @ntb: NTB device context. * @pidx: Port index of peer device a message being sent to * @midx: Message register index * @msg: Data to send * * Just try to send data to a peer. Message status register should be * checked by client driver. * * Return: zero on success, negative error if invalid argument passed. */ static int idt_ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx, u32 msg) { struct idt_ntb_dev *ndev = to_ndev_ntb(ntb); unsigned long irqflags; u32 swpmsgctl = 0; if (midx < 0 || IDT_MSG_CNT <= midx) return -EINVAL; if (pidx < 0 || ndev->peer_cnt <= pidx) return -EINVAL; /* Collect the routing information */ swpmsgctl = SET_FIELD(SWPxMSGCTL_REG, 0, midx) | SET_FIELD(SWPxMSGCTL_PART, 0, ndev->peers[pidx].part); /* Lock the messages routing table of the specified register */ spin_lock_irqsave(&ndev->msg_locks[midx], irqflags); /* Set the route and send the data */ idt_sw_write(ndev, partdata_tbl[ndev->part].msgctl[midx], swpmsgctl); idt_nt_write(ndev, ntdata_tbl.msgs[midx].out, msg); mmiowb(); /* Unlock the messages routing table */ spin_unlock_irqrestore(&ndev->msg_locks[midx], irqflags); /* Client driver shall check the status register */ return 0; } /*============================================================================= * 7. Temperature sensor operations * * IDT PCIe-switch has an embedded temperature sensor, which can be used to * check current chip core temperature. Since a workload environment can be * different on different platforms, an offset and ADC/filter settings can be * specified. Although the offset configuration is only exposed to the sysfs * hwmon interface at the moment. The rest of the settings can be adjusted * for instance by the BIOS/EEPROM firmware. *============================================================================= */ /* * idt_get_deg() - convert millidegree Celsius value to just degree * @mdegC: IN - millidegree Celsius value * * Return: Degree corresponding to the passed millidegree value */ static inline s8 idt_get_deg(long mdegC) { return mdegC / 1000; } /* * idt_get_frac() - retrieve 0/0.5 fraction of the millidegree Celsius value * @mdegC: IN - millidegree Celsius value * * Return: 0/0.5 degree fraction of the passed millidegree value */ static inline u8 idt_get_deg_frac(long mdegC) { return (mdegC % 1000) >= 500 ? 5 : 0; } /* * idt_get_temp_fmt() - convert millidegree Celsius value to 0:7:1 format * @mdegC: IN - millidegree Celsius value * * Return: 0:7:1 format acceptable by the IDT temperature sensor */ static inline u8 idt_temp_get_fmt(long mdegC) { return (idt_get_deg(mdegC) << 1) | (idt_get_deg_frac(mdegC) ? 1 : 0); } /* * idt_get_temp_sval() - convert temp sample to signed millidegree Celsius * @data: IN - shifted to LSB 8-bits temperature sample * * Return: signed millidegree Celsius */ static inline long idt_get_temp_sval(u32 data) { return ((s8)data / 2) * 1000 + (data & 0x1 ? 500 : 0); } /* * idt_get_temp_sval() - convert temp sample to unsigned millidegree Celsius * @data: IN - shifted to LSB 8-bits temperature sample * * Return: unsigned millidegree Celsius */ static inline long idt_get_temp_uval(u32 data) { return (data / 2) * 1000 + (data & 0x1 ? 500 : 0); } /* * idt_read_temp() - read temperature from chip sensor * @ntb: NTB device context. * @type: IN - type of the temperature value to read * @val: OUT - integer value of temperature in millidegree Celsius */ static void idt_read_temp(struct idt_ntb_dev *ndev, const enum idt_temp_val type, long *val) { u32 data; /* Alter the temperature field in accordance with the passed type */ switch (type) { case IDT_TEMP_CUR: data = GET_FIELD(TMPSTS_TEMP, idt_sw_read(ndev, IDT_SW_TMPSTS)); break; case IDT_TEMP_LOW: data = GET_FIELD(TMPSTS_LTEMP, idt_sw_read(ndev, IDT_SW_TMPSTS)); break; case IDT_TEMP_HIGH: data = GET_FIELD(TMPSTS_HTEMP, idt_sw_read(ndev, IDT_SW_TMPSTS)); break; case IDT_TEMP_OFFSET: /* This is the only field with signed 0:7:1 format */ data = GET_FIELD(TMPADJ_OFFSET, idt_sw_read(ndev, IDT_SW_TMPADJ)); *val = idt_get_temp_sval(data); return; default: data = GET_FIELD(TMPSTS_TEMP, idt_sw_read(ndev, IDT_SW_TMPSTS)); break; } /* The rest of the fields accept unsigned 0:7:1 format */ *val = idt_get_temp_uval(data); } /* * idt_write_temp() - write temperature to the chip sensor register * @ntb: NTB device context. * @type: IN - type of the temperature value to change * @val: IN - integer value of temperature in millidegree Celsius */ static void idt_write_temp(struct idt_ntb_dev *ndev, const enum idt_temp_val type, const long val) { unsigned int reg; u32 data; u8 fmt; /* Retrieve the properly formatted temperature value */ fmt = idt_temp_get_fmt(val); mutex_lock(&ndev->hwmon_mtx); switch (type) { case IDT_TEMP_LOW: reg = IDT_SW_TMPALARM; data = SET_FIELD(TMPALARM_LTEMP, idt_sw_read(ndev, reg), fmt) & ~IDT_TMPALARM_IRQ_MASK; break; case IDT_TEMP_HIGH: reg = IDT_SW_TMPALARM; data = SET_FIELD(TMPALARM_HTEMP, idt_sw_read(ndev, reg), fmt) & ~IDT_TMPALARM_IRQ_MASK; break; case IDT_TEMP_OFFSET: reg = IDT_SW_TMPADJ; data = SET_FIELD(TMPADJ_OFFSET, idt_sw_read(ndev, reg), fmt); break; default: goto inval_spin_unlock; } idt_sw_write(ndev, reg, data); inval_spin_unlock: mutex_unlock(&ndev->hwmon_mtx); } /* * idt_sysfs_show_temp() - printout corresponding temperature value * @dev: Pointer to the NTB device structure * @da: Sensor device attribute structure * @buf: Buffer to print temperature out * * Return: Number of written symbols or negative error */ static ssize_t idt_sysfs_show_temp(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct idt_ntb_dev *ndev = dev_get_drvdata(dev); enum idt_temp_val type = attr->index; long mdeg; idt_read_temp(ndev, type, &mdeg); return sprintf(buf, "%ld\n", mdeg); } /* * idt_sysfs_set_temp() - set corresponding temperature value * @dev: Pointer to the NTB device structure * @da: Sensor device attribute structure * @buf: Buffer to print temperature out * @count: Size of the passed buffer * * Return: Number of written symbols or negative error */ static ssize_t idt_sysfs_set_temp(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct idt_ntb_dev *ndev = dev_get_drvdata(dev); enum idt_temp_val type = attr->index; long mdeg; int ret; ret = kstrtol(buf, 10, &mdeg); if (ret) return ret; /* Clamp the passed value in accordance with the type */ if (type == IDT_TEMP_OFFSET) mdeg = clamp_val(mdeg, IDT_TEMP_MIN_OFFSET, IDT_TEMP_MAX_OFFSET); else mdeg = clamp_val(mdeg, IDT_TEMP_MIN_MDEG, IDT_TEMP_MAX_MDEG); idt_write_temp(ndev, type, mdeg); return count; } /* * idt_sysfs_reset_hist() - reset temperature history * @dev: Pointer to the NTB device structure * @da: Sensor device attribute structure * @buf: Buffer to print temperature out * @count: Size of the passed buffer * * Return: Number of written symbols or negative error */ static ssize_t idt_sysfs_reset_hist(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct idt_ntb_dev *ndev = dev_get_drvdata(dev); /* Just set the maximal value to the lowest temperature field and * minimal value to the highest temperature field */ idt_write_temp(ndev, IDT_TEMP_LOW, IDT_TEMP_MAX_MDEG); idt_write_temp(ndev, IDT_TEMP_HIGH, IDT_TEMP_MIN_MDEG); return count; } /* * Hwmon IDT sysfs attributes */ static SENSOR_DEVICE_ATTR(temp1_input, 0444, idt_sysfs_show_temp, NULL, IDT_TEMP_CUR); static SENSOR_DEVICE_ATTR(temp1_lowest, 0444, idt_sysfs_show_temp, NULL, IDT_TEMP_LOW); static SENSOR_DEVICE_ATTR(temp1_highest, 0444, idt_sysfs_show_temp, NULL, IDT_TEMP_HIGH); static SENSOR_DEVICE_ATTR(temp1_offset, 0644, idt_sysfs_show_temp, idt_sysfs_set_temp, IDT_TEMP_OFFSET); static DEVICE_ATTR(temp1_reset_history, 0200, NULL, idt_sysfs_reset_hist); /* * Hwmon IDT sysfs attributes group */ static struct attribute *idt_temp_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_lowest.dev_attr.attr, &sensor_dev_attr_temp1_highest.dev_attr.attr, &sensor_dev_attr_temp1_offset.dev_attr.attr, &dev_attr_temp1_reset_history.attr, NULL }; ATTRIBUTE_GROUPS(idt_temp); /* * idt_init_temp() - initialize temperature sensor interface * @ndev: IDT NTB hardware driver descriptor * * Simple sensor initializarion method is responsible for device switching * on and resource management based hwmon interface registration. Note, that * since the device is shared we won't disable it on remove, but leave it * working until the system is powered off. */ static void idt_init_temp(struct idt_ntb_dev *ndev) { struct device *hwmon; /* Enable sensor if it hasn't been already */ idt_sw_write(ndev, IDT_SW_TMPCTL, 0x0); /* Initialize hwmon interface fields */ mutex_init(&ndev->hwmon_mtx); hwmon = devm_hwmon_device_register_with_groups(&ndev->ntb.pdev->dev, ndev->swcfg->name, ndev, idt_temp_groups); if (IS_ERR(hwmon)) { dev_err(&ndev->ntb.pdev->dev, "Couldn't create hwmon device"); return; } dev_dbg(&ndev->ntb.pdev->dev, "Temperature HWmon interface registered"); } /*============================================================================= * 8. ISRs related operations * * IDT PCIe-switch has strangely developed IRQ system. There is just one * interrupt vector for doorbell and message registers. So the hardware driver * can't determine actual source of IRQ if, for example, message event happened * while any of unmasked doorbell is still set. The similar situation may be if * switch or temperature sensor events pop up. The difference is that SEVENT * and TMPSENSOR bits of NT interrupt status register can be cleaned by * IRQ handler so a next interrupt request won't have false handling of * corresponding events. * The hardware driver has only bottom-half handler of the IRQ, since if any * of events happened the device won't raise it again before the last one is * handled by clearing of corresponding NTINTSTS bit. *============================================================================= */ static irqreturn_t idt_thread_isr(int irq, void *devid); /* * idt_init_isr() - initialize PCIe interrupt handler * @ndev: IDT NTB hardware driver descriptor * * Return: zero on success, otherwise a negative error number. */ static int idt_init_isr(struct idt_ntb_dev *ndev) { struct pci_dev *pdev = ndev->ntb.pdev; u32 ntint_mask; int ret; /* Allocate just one interrupt vector for the ISR */ ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI | PCI_IRQ_LEGACY); if (ret != 1) { dev_err(&pdev->dev, "Failed to allocate IRQ vector"); return ret; } /* Retrieve the IRQ vector */ ret = pci_irq_vector(pdev, 0); if (ret < 0) { dev_err(&pdev->dev, "Failed to get IRQ vector"); goto err_free_vectors; } /* Set the IRQ handler */ ret = devm_request_threaded_irq(&pdev->dev, ret, NULL, idt_thread_isr, IRQF_ONESHOT, NTB_IRQNAME, ndev); if (ret != 0) { dev_err(&pdev->dev, "Failed to set MSI IRQ handler, %d", ret); goto err_free_vectors; } /* Unmask Message/Doorbell/SE interrupts */ ntint_mask = idt_nt_read(ndev, IDT_NT_NTINTMSK) & ~IDT_NTINTMSK_ALL; idt_nt_write(ndev, IDT_NT_NTINTMSK, ntint_mask); /* From now on the interrupts are enabled */ dev_dbg(&pdev->dev, "NTB interrupts initialized"); return 0; err_free_vectors: pci_free_irq_vectors(pdev); return ret; } /* * idt_deinit_ist() - deinitialize PCIe interrupt handler * @ndev: IDT NTB hardware driver descriptor * * Disable corresponding interrupts and free allocated IRQ vectors. */ static void idt_deinit_isr(struct idt_ntb_dev *ndev) { struct pci_dev *pdev = ndev->ntb.pdev; u32 ntint_mask; /* Mask interrupts back */ ntint_mask = idt_nt_read(ndev, IDT_NT_NTINTMSK) | IDT_NTINTMSK_ALL; idt_nt_write(ndev, IDT_NT_NTINTMSK, ntint_mask); /* Manually free IRQ otherwise PCI free irq vectors will fail */ devm_free_irq(&pdev->dev, pci_irq_vector(pdev, 0), ndev); /* Free allocated IRQ vectors */ pci_free_irq_vectors(pdev); dev_dbg(&pdev->dev, "NTB interrupts deinitialized"); } /* * idt_thread_isr() - NT function interrupts handler * @irq: IRQ number * @devid: Custom buffer * * It reads current NT interrupts state register and handles all the event * it declares. * The method is bottom-half routine of actual default PCIe IRQ handler. */ static irqreturn_t idt_thread_isr(int irq, void *devid) { struct idt_ntb_dev *ndev = devid; bool handled = false; u32 ntint_sts; /* Read the NT interrupts status register */ ntint_sts = idt_nt_read(ndev, IDT_NT_NTINTSTS); /* Handle messaging interrupts */ if (ntint_sts & IDT_NTINTSTS_MSG) { idt_msg_isr(ndev, ntint_sts); handled = true; } /* Handle doorbell interrupts */ if (ntint_sts & IDT_NTINTSTS_DBELL) { idt_db_isr(ndev, ntint_sts); handled = true; } /* Handle switch event interrupts */ if (ntint_sts & IDT_NTINTSTS_SEVENT) { idt_se_isr(ndev, ntint_sts); handled = true; } dev_dbg(&ndev->ntb.pdev->dev, "IDT IRQs 0x%08x handled", ntint_sts); return handled ? IRQ_HANDLED : IRQ_NONE; } /*=========================================================================== * 9. NTB hardware driver initialization *=========================================================================== */ /* * NTB API operations */ static const struct ntb_dev_ops idt_ntb_ops = { .port_number = idt_ntb_port_number, .peer_port_count = idt_ntb_peer_port_count, .peer_port_number = idt_ntb_peer_port_number, .peer_port_idx = idt_ntb_peer_port_idx, .link_is_up = idt_ntb_link_is_up, .link_enable = idt_ntb_link_enable, .link_disable = idt_ntb_link_disable, .mw_count = idt_ntb_mw_count, .mw_get_align = idt_ntb_mw_get_align, .peer_mw_count = idt_ntb_peer_mw_count, .peer_mw_get_addr = idt_ntb_peer_mw_get_addr, .peer_mw_set_trans = idt_ntb_peer_mw_set_trans, .peer_mw_clear_trans = idt_ntb_peer_mw_clear_trans, .db_valid_mask = idt_ntb_db_valid_mask, .db_read = idt_ntb_db_read, .db_clear = idt_ntb_db_clear, .db_read_mask = idt_ntb_db_read_mask, .db_set_mask = idt_ntb_db_set_mask, .db_clear_mask = idt_ntb_db_clear_mask, .peer_db_set = idt_ntb_peer_db_set, .msg_count = idt_ntb_msg_count, .msg_inbits = idt_ntb_msg_inbits, .msg_outbits = idt_ntb_msg_outbits, .msg_read_sts = idt_ntb_msg_read_sts, .msg_clear_sts = idt_ntb_msg_clear_sts, .msg_set_mask = idt_ntb_msg_set_mask, .msg_clear_mask = idt_ntb_msg_clear_mask, .msg_read = idt_ntb_msg_read, .peer_msg_write = idt_ntb_peer_msg_write }; /* * idt_register_device() - register IDT NTB device * @ndev: IDT NTB hardware driver descriptor * * Return: zero on success, otherwise a negative error number. */ static int idt_register_device(struct idt_ntb_dev *ndev) { int ret; /* Initialize the rest of NTB device structure and register it */ ndev->ntb.ops = &idt_ntb_ops; ndev->ntb.topo = NTB_TOPO_SWITCH; ret = ntb_register_device(&ndev->ntb); if (ret != 0) { dev_err(&ndev->ntb.pdev->dev, "Failed to register NTB device"); return ret; } dev_dbg(&ndev->ntb.pdev->dev, "NTB device successfully registered"); return 0; } /* * idt_unregister_device() - unregister IDT NTB device * @ndev: IDT NTB hardware driver descriptor */ static void idt_unregister_device(struct idt_ntb_dev *ndev) { /* Just unregister the NTB device */ ntb_unregister_device(&ndev->ntb); dev_dbg(&ndev->ntb.pdev->dev, "NTB device unregistered"); } /*============================================================================= * 10. DebugFS node initialization *============================================================================= */ static ssize_t idt_dbgfs_info_read(struct file *filp, char __user *ubuf, size_t count, loff_t *offp); /* * Driver DebugFS info file operations */ static const struct file_operations idt_dbgfs_info_ops = { .owner = THIS_MODULE, .open = simple_open, .read = idt_dbgfs_info_read }; /* * idt_dbgfs_info_read() - DebugFS read info node callback * @file: File node descriptor. * @ubuf: User-space buffer to put data to * @count: Size of the buffer * @offp: Offset within the buffer */ static ssize_t idt_dbgfs_info_read(struct file *filp, char __user *ubuf, size_t count, loff_t *offp) { struct idt_ntb_dev *ndev = filp->private_data; unsigned char idx, pidx, cnt; unsigned long irqflags, mdeg; ssize_t ret = 0, off = 0; enum ntb_speed speed; enum ntb_width width; char *strbuf; size_t size; u32 data; /* Lets limit the buffer size the way the Intel/AMD drivers do */ size = min_t(size_t, count, 0x1000U); /* Allocate the memory for the buffer */ strbuf = kmalloc(size, GFP_KERNEL); if (strbuf == NULL) return -ENOMEM; /* Put the data into the string buffer */ off += scnprintf(strbuf + off, size - off, "\n\t\tIDT NTB device Information:\n\n"); /* General local device configurations */ off += scnprintf(strbuf + off, size - off, "Local Port %hhu, Partition %hhu\n", ndev->port, ndev->part); /* Peer ports information */ off += scnprintf(strbuf + off, size - off, "Peers:\n"); for (idx = 0; idx < ndev->peer_cnt; idx++) { off += scnprintf(strbuf + off, size - off, "\t%hhu. Port %hhu, Partition %hhu\n", idx, ndev->peers[idx].port, ndev->peers[idx].part); } /* Links status */ data = idt_ntb_link_is_up(&ndev->ntb, &speed, &width); off += scnprintf(strbuf + off, size - off, "NTB link status\t- 0x%08x, ", data); off += scnprintf(strbuf + off, size - off, "PCIe Gen %d x%d lanes\n", speed, width); /* Mapping table entries */ off += scnprintf(strbuf + off, size - off, "NTB Mapping Table:\n"); for (idx = 0; idx < IDT_MTBL_ENTRY_CNT; idx++) { spin_lock_irqsave(&ndev->mtbl_lock, irqflags); idt_nt_write(ndev, IDT_NT_NTMTBLADDR, idx); data = idt_nt_read(ndev, IDT_NT_NTMTBLDATA); spin_unlock_irqrestore(&ndev->mtbl_lock, irqflags); /* Print valid entries only */ if (data & IDT_NTMTBLDATA_VALID) { off += scnprintf(strbuf + off, size - off, "\t%hhu. Partition %d, Requester ID 0x%04x\n", idx, GET_FIELD(NTMTBLDATA_PART, data), GET_FIELD(NTMTBLDATA_REQID, data)); } } off += scnprintf(strbuf + off, size - off, "\n"); /* Outbound memory windows information */ off += scnprintf(strbuf + off, size - off, "Outbound Memory Windows:\n"); for (idx = 0; idx < ndev->mw_cnt; idx += cnt) { data = ndev->mws[idx].type; cnt = idt_get_mw_count(data); /* Print Memory Window information */ if (data == IDT_MW_DIR) off += scnprintf(strbuf + off, size - off, "\t%hhu.\t", idx); else off += scnprintf(strbuf + off, size - off, "\t%hhu-%hhu.\t", idx, idx + cnt - 1); off += scnprintf(strbuf + off, size - off, "%s BAR%hhu, ", idt_get_mw_name(data), ndev->mws[idx].bar); off += scnprintf(strbuf + off, size - off, "Address align 0x%08llx, ", ndev->mws[idx].addr_align); off += scnprintf(strbuf + off, size - off, "Size align 0x%08llx, Size max %llu\n", ndev->mws[idx].size_align, ndev->mws[idx].size_max); } /* Inbound memory windows information */ for (pidx = 0; pidx < ndev->peer_cnt; pidx++) { off += scnprintf(strbuf + off, size - off, "Inbound Memory Windows for peer %hhu (Port %hhu):\n", pidx, ndev->peers[pidx].port); /* Print Memory Windows information */ for (idx = 0; idx < ndev->peers[pidx].mw_cnt; idx += cnt) { data = ndev->peers[pidx].mws[idx].type; cnt = idt_get_mw_count(data); if (data == IDT_MW_DIR) off += scnprintf(strbuf + off, size - off, "\t%hhu.\t", idx); else off += scnprintf(strbuf + off, size - off, "\t%hhu-%hhu.\t", idx, idx + cnt - 1); off += scnprintf(strbuf + off, size - off, "%s BAR%hhu, ", idt_get_mw_name(data), ndev->peers[pidx].mws[idx].bar); off += scnprintf(strbuf + off, size - off, "Address align 0x%08llx, ", ndev->peers[pidx].mws[idx].addr_align); off += scnprintf(strbuf + off, size - off, "Size align 0x%08llx, Size max %llu\n", ndev->peers[pidx].mws[idx].size_align, ndev->peers[pidx].mws[idx].size_max); } } off += scnprintf(strbuf + off, size - off, "\n"); /* Doorbell information */ data = idt_sw_read(ndev, IDT_SW_GDBELLSTS); off += scnprintf(strbuf + off, size - off, "Global Doorbell state\t- 0x%08x\n", data); data = idt_ntb_db_read(&ndev->ntb); off += scnprintf(strbuf + off, size - off, "Local Doorbell state\t- 0x%08x\n", data); data = idt_nt_read(ndev, IDT_NT_INDBELLMSK); off += scnprintf(strbuf + off, size - off, "Local Doorbell mask\t- 0x%08x\n", data); off += scnprintf(strbuf + off, size - off, "\n"); /* Messaging information */ off += scnprintf(strbuf + off, size - off, "Message event valid\t- 0x%08x\n", IDT_MSG_MASK); data = idt_ntb_msg_read_sts(&ndev->ntb); off += scnprintf(strbuf + off, size - off, "Message event status\t- 0x%08x\n", data); data = idt_nt_read(ndev, IDT_NT_MSGSTSMSK); off += scnprintf(strbuf + off, size - off, "Message event mask\t- 0x%08x\n", data); off += scnprintf(strbuf + off, size - off, "Message data:\n"); for (idx = 0; idx < IDT_MSG_CNT; idx++) { int src; data = idt_ntb_msg_read(&ndev->ntb, &src, idx); off += scnprintf(strbuf + off, size - off, "\t%hhu. 0x%08x from peer %hhu (Port %hhu)\n", idx, data, src, ndev->peers[src].port); } off += scnprintf(strbuf + off, size - off, "\n"); /* Current temperature */ idt_read_temp(ndev, IDT_TEMP_CUR, &mdeg); off += scnprintf(strbuf + off, size - off, "Switch temperature\t\t- %hhd.%hhuC\n", idt_get_deg(mdeg), idt_get_deg_frac(mdeg)); /* Copy the buffer to the User Space */ ret = simple_read_from_buffer(ubuf, count, offp, strbuf, off); kfree(strbuf); return ret; } /* * idt_init_dbgfs() - initialize DebugFS node * @ndev: IDT NTB hardware driver descriptor * * Return: zero on success, otherwise a negative error number. */ static int idt_init_dbgfs(struct idt_ntb_dev *ndev) { char devname[64]; /* If the top directory is not created then do nothing */ if (IS_ERR_OR_NULL(dbgfs_topdir)) { dev_info(&ndev->ntb.pdev->dev, "Top DebugFS directory absent"); return PTR_ERR(dbgfs_topdir); } /* Create the info file node */ snprintf(devname, 64, "info:%s", pci_name(ndev->ntb.pdev)); ndev->dbgfs_info = debugfs_create_file(devname, 0400, dbgfs_topdir, ndev, &idt_dbgfs_info_ops); if (IS_ERR(ndev->dbgfs_info)) { dev_dbg(&ndev->ntb.pdev->dev, "Failed to create DebugFS node"); return PTR_ERR(ndev->dbgfs_info); } dev_dbg(&ndev->ntb.pdev->dev, "NTB device DebugFS node created"); return 0; } /* * idt_deinit_dbgfs() - deinitialize DebugFS node * @ndev: IDT NTB hardware driver descriptor * * Just discard the info node from DebugFS */ static void idt_deinit_dbgfs(struct idt_ntb_dev *ndev) { debugfs_remove(ndev->dbgfs_info); dev_dbg(&ndev->ntb.pdev->dev, "NTB device DebugFS node discarded"); } /*============================================================================= * 11. Basic PCIe device initialization *============================================================================= */ /* * idt_check_setup() - Check whether the IDT PCIe-swtich is properly * pre-initialized * @pdev: Pointer to the PCI device descriptor * * Return: zero on success, otherwise a negative error number. */ static int idt_check_setup(struct pci_dev *pdev) { u32 data; int ret; /* Read the BARSETUP0 */ ret = pci_read_config_dword(pdev, IDT_NT_BARSETUP0, &data); if (ret != 0) { dev_err(&pdev->dev, "Failed to read BARSETUP0 config register"); return ret; } /* Check whether the BAR0 register is enabled to be of config space */ if (!(data & IDT_BARSETUP_EN) || !(data & IDT_BARSETUP_MODE_CFG)) { dev_err(&pdev->dev, "BAR0 doesn't map config space"); return -EINVAL; } /* Configuration space BAR0 must have certain size */ if ((data & IDT_BARSETUP_SIZE_MASK) != IDT_BARSETUP_SIZE_CFG) { dev_err(&pdev->dev, "Invalid size of config space"); return -EINVAL; } dev_dbg(&pdev->dev, "NTB device pre-initialized correctly"); return 0; } /* * Create the IDT PCIe-switch driver descriptor * @pdev: Pointer to the PCI device descriptor * @id: IDT PCIe-device configuration * * It just allocates a memory for IDT PCIe-switch device structure and * initializes some commonly used fields. * * No need of release method, since managed device resource is used for * memory allocation. * * Return: pointer to the descriptor, otherwise a negative error number. */ static struct idt_ntb_dev *idt_create_dev(struct pci_dev *pdev, const struct pci_device_id *id) { struct idt_ntb_dev *ndev; /* Allocate memory for the IDT PCIe-device descriptor */ ndev = devm_kzalloc(&pdev->dev, sizeof(*ndev), GFP_KERNEL); if (!ndev) { dev_err(&pdev->dev, "Memory allocation failed for descriptor"); return ERR_PTR(-ENOMEM); } /* Save the IDT PCIe-switch ports configuration */ ndev->swcfg = (struct idt_89hpes_cfg *)id->driver_data; /* Save the PCI-device pointer inside the NTB device structure */ ndev->ntb.pdev = pdev; /* Initialize spin locker of Doorbell, Message and GASA registers */ spin_lock_init(&ndev->db_mask_lock); spin_lock_init(&ndev->msg_mask_lock); spin_lock_init(&ndev->gasa_lock); dev_info(&pdev->dev, "IDT %s discovered", ndev->swcfg->name); dev_dbg(&pdev->dev, "NTB device descriptor created"); return ndev; } /* * idt_init_pci() - initialize the basic PCI-related subsystem * @ndev: Pointer to the IDT PCIe-switch driver descriptor * * Managed device resources will be freed automatically in case of failure or * driver detachment. * * Return: zero on success, otherwise negative error number. */ static int idt_init_pci(struct idt_ntb_dev *ndev) { struct pci_dev *pdev = ndev->ntb.pdev; int ret; /* Initialize the bit mask of PCI/NTB DMA */ ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); if (ret != 0) { ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); if (ret != 0) { dev_err(&pdev->dev, "Failed to set DMA bit mask\n"); return ret; } dev_warn(&pdev->dev, "Cannot set DMA highmem bit mask\n"); } ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); if (ret != 0) { ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); if (ret != 0) { dev_err(&pdev->dev, "Failed to set consistent DMA bit mask\n"); return ret; } dev_warn(&pdev->dev, "Cannot set consistent DMA highmem bit mask\n"); } ret = dma_coerce_mask_and_coherent(&ndev->ntb.dev, dma_get_mask(&pdev->dev)); if (ret != 0) { dev_err(&pdev->dev, "Failed to set NTB device DMA bit mask\n"); return ret; } /* * Enable the device advanced error reporting. It's not critical to * have AER disabled in the kernel. */ ret = pci_enable_pcie_error_reporting(pdev); if (ret != 0) dev_warn(&pdev->dev, "PCIe AER capability disabled\n"); else /* Cleanup uncorrectable error status before getting to init */ pci_cleanup_aer_uncorrect_error_status(pdev); /* First enable the PCI device */ ret = pcim_enable_device(pdev); if (ret != 0) { dev_err(&pdev->dev, "Failed to enable PCIe device\n"); goto err_disable_aer; } /* * Enable the bus mastering, which effectively enables MSI IRQs and * Request TLPs translation */ pci_set_master(pdev); /* Request all BARs resources and map BAR0 only */ ret = pcim_iomap_regions_request_all(pdev, 1, NTB_NAME); if (ret != 0) { dev_err(&pdev->dev, "Failed to request resources\n"); goto err_clear_master; } /* Retrieve virtual address of BAR0 - PCI configuration space */ ndev->cfgspc = pcim_iomap_table(pdev)[0]; /* Put the IDT driver data pointer to the PCI-device private pointer */ pci_set_drvdata(pdev, ndev); dev_dbg(&pdev->dev, "NT-function PCIe interface initialized"); return 0; err_clear_master: pci_clear_master(pdev); err_disable_aer: (void)pci_disable_pcie_error_reporting(pdev); return ret; } /* * idt_deinit_pci() - deinitialize the basic PCI-related subsystem * @ndev: Pointer to the IDT PCIe-switch driver descriptor * * Managed resources will be freed on the driver detachment */ static void idt_deinit_pci(struct idt_ntb_dev *ndev) { struct pci_dev *pdev = ndev->ntb.pdev; /* Clean up the PCI-device private data pointer */ pci_set_drvdata(pdev, NULL); /* Clear the bus master disabling the Request TLPs translation */ pci_clear_master(pdev); /* Disable the AER capability */ (void)pci_disable_pcie_error_reporting(pdev); dev_dbg(&pdev->dev, "NT-function PCIe interface cleared"); } /*=========================================================================== * 12. PCI bus callback functions *=========================================================================== */ /* * idt_pci_probe() - PCI device probe callback * @pdev: Pointer to PCI device structure * @id: PCIe device custom descriptor * * Return: zero on success, otherwise negative error number */ static int idt_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct idt_ntb_dev *ndev; int ret; /* Check whether IDT PCIe-switch is properly pre-initialized */ ret = idt_check_setup(pdev); if (ret != 0) return ret; /* Allocate the memory for IDT NTB device data */ ndev = idt_create_dev(pdev, id); if (IS_ERR_OR_NULL(ndev)) return PTR_ERR(ndev); /* Initialize the basic PCI subsystem of the device */ ret = idt_init_pci(ndev); if (ret != 0) return ret; /* Scan ports of the IDT PCIe-switch */ (void)idt_scan_ports(ndev); /* Initialize NTB link events subsystem */ idt_init_link(ndev); /* Initialize MWs subsystem */ ret = idt_init_mws(ndev); if (ret != 0) goto err_deinit_link; /* Initialize Messaging subsystem */ idt_init_msg(ndev); /* Initialize hwmon interface */ idt_init_temp(ndev); /* Initialize IDT interrupts handler */ ret = idt_init_isr(ndev); if (ret != 0) goto err_deinit_link; /* Register IDT NTB devices on the NTB bus */ ret = idt_register_device(ndev); if (ret != 0) goto err_deinit_isr; /* Initialize DebugFS info node */ (void)idt_init_dbgfs(ndev); /* IDT PCIe-switch NTB driver is finally initialized */ dev_info(&pdev->dev, "IDT NTB device is ready"); /* May the force be with us... */ return 0; err_deinit_isr: idt_deinit_isr(ndev); err_deinit_link: idt_deinit_link(ndev); idt_deinit_pci(ndev); return ret; } /* * idt_pci_probe() - PCI device remove callback * @pdev: Pointer to PCI device structure */ static void idt_pci_remove(struct pci_dev *pdev) { struct idt_ntb_dev *ndev = pci_get_drvdata(pdev); /* Deinit the DebugFS node */ idt_deinit_dbgfs(ndev); /* Unregister NTB device */ idt_unregister_device(ndev); /* Stop the interrupts handling */ idt_deinit_isr(ndev); /* Deinitialize link event subsystem */ idt_deinit_link(ndev); /* Deinit basic PCI subsystem */ idt_deinit_pci(ndev); /* IDT PCIe-switch NTB driver is finally initialized */ dev_info(&pdev->dev, "IDT NTB device is removed"); /* Sayonara... */ } /* * IDT PCIe-switch models ports configuration structures */ static const struct idt_89hpes_cfg idt_89hpes24nt6ag2_config = { .name = "89HPES24NT6AG2", .port_cnt = 6, .ports = {0, 2, 4, 6, 8, 12} }; static const struct idt_89hpes_cfg idt_89hpes32nt8ag2_config = { .name = "89HPES32NT8AG2", .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20} }; static const struct idt_89hpes_cfg idt_89hpes32nt8bg2_config = { .name = "89HPES32NT8BG2", .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20} }; static const struct idt_89hpes_cfg idt_89hpes12nt12g2_config = { .name = "89HPES12NT12G2", .port_cnt = 3, .ports = {0, 8, 16} }; static const struct idt_89hpes_cfg idt_89hpes16nt16g2_config = { .name = "89HPES16NT16G2", .port_cnt = 4, .ports = {0, 8, 12, 16} }; static const struct idt_89hpes_cfg idt_89hpes24nt24g2_config = { .name = "89HPES24NT24G2", .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20} }; static const struct idt_89hpes_cfg idt_89hpes32nt24ag2_config = { .name = "89HPES32NT24AG2", .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20} }; static const struct idt_89hpes_cfg idt_89hpes32nt24bg2_config = { .name = "89HPES32NT24BG2", .port_cnt = 8, .ports = {0, 2, 4, 6, 8, 12, 16, 20} }; /* * PCI-ids table of the supported IDT PCIe-switch devices */ static const struct pci_device_id idt_pci_tbl[] = { {IDT_PCI_DEVICE_IDS(89HPES24NT6AG2, idt_89hpes24nt6ag2_config)}, {IDT_PCI_DEVICE_IDS(89HPES32NT8AG2, idt_89hpes32nt8ag2_config)}, {IDT_PCI_DEVICE_IDS(89HPES32NT8BG2, idt_89hpes32nt8bg2_config)}, {IDT_PCI_DEVICE_IDS(89HPES12NT12G2, idt_89hpes12nt12g2_config)}, {IDT_PCI_DEVICE_IDS(89HPES16NT16G2, idt_89hpes16nt16g2_config)}, {IDT_PCI_DEVICE_IDS(89HPES24NT24G2, idt_89hpes24nt24g2_config)}, {IDT_PCI_DEVICE_IDS(89HPES32NT24AG2, idt_89hpes32nt24ag2_config)}, {IDT_PCI_DEVICE_IDS(89HPES32NT24BG2, idt_89hpes32nt24bg2_config)}, {0} }; MODULE_DEVICE_TABLE(pci, idt_pci_tbl); /* * IDT PCIe-switch NT-function device driver structure definition */ static struct pci_driver idt_pci_driver = { .name = KBUILD_MODNAME, .probe = idt_pci_probe, .remove = idt_pci_remove, .id_table = idt_pci_tbl, }; static int __init idt_pci_driver_init(void) { pr_info("%s %s\n", NTB_DESC, NTB_VER); /* Create the top DebugFS directory if the FS is initialized */ if (debugfs_initialized()) dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL); /* Register the NTB hardware driver to handle the PCI device */ return pci_register_driver(&idt_pci_driver); } module_init(idt_pci_driver_init); static void __exit idt_pci_driver_exit(void) { /* Unregister the NTB hardware driver */ pci_unregister_driver(&idt_pci_driver); /* Discard the top DebugFS directory */ debugfs_remove_recursive(dbgfs_topdir); } module_exit(idt_pci_driver_exit);
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