blob: 8c95fcd8e64b098e90797c4fed25b564efcf0c86 [file] [log] [blame]
// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2014 - 2020 Intel Corporation */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include "adf_accel_devices.h"
#include "adf_common_drv.h"
#include "adf_cfg.h"
#include "adf_cfg_strings.h"
#include "adf_cfg_common.h"
#include "adf_transport_access_macros.h"
#include "adf_transport_internal.h"
#define ADF_VINTSOU_OFFSET 0x204
#define ADF_VINTMSK_OFFSET 0x208
#define ADF_VINTSOU_BUN BIT(0)
#define ADF_VINTSOU_PF2VF BIT(1)
static struct workqueue_struct *adf_vf_stop_wq;
struct adf_vf_stop_data {
struct adf_accel_dev *accel_dev;
struct work_struct work;
};
void adf_enable_pf2vf_interrupts(struct adf_accel_dev *accel_dev)
{
void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
ADF_CSR_WR(pmisc_addr, ADF_VINTMSK_OFFSET, 0x0);
}
void adf_disable_pf2vf_interrupts(struct adf_accel_dev *accel_dev)
{
void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
ADF_CSR_WR(pmisc_addr, ADF_VINTMSK_OFFSET, 0x2);
}
EXPORT_SYMBOL_GPL(adf_disable_pf2vf_interrupts);
static int adf_enable_msi(struct adf_accel_dev *accel_dev)
{
struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
int stat = pci_alloc_irq_vectors(pci_dev_info->pci_dev, 1, 1,
PCI_IRQ_MSI);
if (unlikely(stat < 0)) {
dev_err(&GET_DEV(accel_dev),
"Failed to enable MSI interrupt: %d\n", stat);
return stat;
}
return 0;
}
static void adf_disable_msi(struct adf_accel_dev *accel_dev)
{
struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
pci_free_irq_vectors(pdev);
}
static void adf_dev_stop_async(struct work_struct *work)
{
struct adf_vf_stop_data *stop_data =
container_of(work, struct adf_vf_stop_data, work);
struct adf_accel_dev *accel_dev = stop_data->accel_dev;
adf_dev_restarting_notify(accel_dev);
adf_dev_stop(accel_dev);
adf_dev_shutdown(accel_dev);
/* Re-enable PF2VF interrupts */
adf_enable_pf2vf_interrupts(accel_dev);
kfree(stop_data);
}
int adf_pf2vf_handle_pf_restarting(struct adf_accel_dev *accel_dev)
{
struct adf_vf_stop_data *stop_data;
clear_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
stop_data = kzalloc(sizeof(*stop_data), GFP_ATOMIC);
if (!stop_data) {
dev_err(&GET_DEV(accel_dev),
"Couldn't schedule stop for vf_%d\n",
accel_dev->accel_id);
return -ENOMEM;
}
stop_data->accel_dev = accel_dev;
INIT_WORK(&stop_data->work, adf_dev_stop_async);
queue_work(adf_vf_stop_wq, &stop_data->work);
return 0;
}
static void adf_pf2vf_bh_handler(void *data)
{
struct adf_accel_dev *accel_dev = data;
bool ret;
ret = adf_recv_and_handle_pf2vf_msg(accel_dev);
if (ret)
/* Re-enable PF2VF interrupts */
adf_enable_pf2vf_interrupts(accel_dev);
return;
}
static int adf_setup_pf2vf_bh(struct adf_accel_dev *accel_dev)
{
tasklet_init(&accel_dev->vf.pf2vf_bh_tasklet,
(void *)adf_pf2vf_bh_handler, (unsigned long)accel_dev);
mutex_init(&accel_dev->vf.vf2pf_lock);
return 0;
}
static void adf_cleanup_pf2vf_bh(struct adf_accel_dev *accel_dev)
{
tasklet_disable(&accel_dev->vf.pf2vf_bh_tasklet);
tasklet_kill(&accel_dev->vf.pf2vf_bh_tasklet);
mutex_destroy(&accel_dev->vf.vf2pf_lock);
}
static irqreturn_t adf_isr(int irq, void *privdata)
{
struct adf_accel_dev *accel_dev = privdata;
struct adf_hw_device_data *hw_data = accel_dev->hw_device;
struct adf_hw_csr_ops *csr_ops = &hw_data->csr_ops;
struct adf_bar *pmisc =
&GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
void __iomem *pmisc_bar_addr = pmisc->virt_addr;
bool handled = false;
u32 v_int, v_mask;
/* Read VF INT source CSR to determine the source of VF interrupt */
v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
/* Read VF INT mask CSR to determine which sources are masked */
v_mask = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTMSK_OFFSET);
/*
* Recompute v_int ignoring sources that are masked. This is to
* avoid rescheduling the tasklet for interrupts already handled
*/
v_int &= ~v_mask;
/* Check for PF2VF interrupt */
if (v_int & ADF_VINTSOU_PF2VF) {
/* Disable PF to VF interrupt */
adf_disable_pf2vf_interrupts(accel_dev);
/* Schedule tasklet to handle interrupt BH */
tasklet_hi_schedule(&accel_dev->vf.pf2vf_bh_tasklet);
handled = true;
}
/* Check bundle interrupt */
if (v_int & ADF_VINTSOU_BUN) {
struct adf_etr_data *etr_data = accel_dev->transport;
struct adf_etr_bank_data *bank = &etr_data->banks[0];
/* Disable Flag and Coalesce Ring Interrupts */
csr_ops->write_csr_int_flag_and_col(bank->csr_addr,
bank->bank_number, 0);
tasklet_hi_schedule(&bank->resp_handler);
handled = true;
}
return handled ? IRQ_HANDLED : IRQ_NONE;
}
static int adf_request_msi_irq(struct adf_accel_dev *accel_dev)
{
struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
unsigned int cpu;
int ret;
snprintf(accel_dev->vf.irq_name, ADF_MAX_MSIX_VECTOR_NAME,
"qat_%02x:%02d.%02d", pdev->bus->number, PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
ret = request_irq(pdev->irq, adf_isr, 0, accel_dev->vf.irq_name,
(void *)accel_dev);
if (ret) {
dev_err(&GET_DEV(accel_dev), "failed to enable irq for %s\n",
accel_dev->vf.irq_name);
return ret;
}
cpu = accel_dev->accel_id % num_online_cpus();
irq_set_affinity_hint(pdev->irq, get_cpu_mask(cpu));
accel_dev->vf.irq_enabled = true;
return ret;
}
static int adf_setup_bh(struct adf_accel_dev *accel_dev)
{
struct adf_etr_data *priv_data = accel_dev->transport;
tasklet_init(&priv_data->banks[0].resp_handler, adf_response_handler,
(unsigned long)priv_data->banks);
return 0;
}
static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
{
struct adf_etr_data *priv_data = accel_dev->transport;
tasklet_disable(&priv_data->banks[0].resp_handler);
tasklet_kill(&priv_data->banks[0].resp_handler);
}
/**
* adf_vf_isr_resource_free() - Free IRQ for acceleration device
* @accel_dev: Pointer to acceleration device.
*
* Function frees interrupts for acceleration device virtual function.
*/
void adf_vf_isr_resource_free(struct adf_accel_dev *accel_dev)
{
struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
if (accel_dev->vf.irq_enabled) {
irq_set_affinity_hint(pdev->irq, NULL);
free_irq(pdev->irq, accel_dev);
}
adf_cleanup_bh(accel_dev);
adf_cleanup_pf2vf_bh(accel_dev);
adf_disable_msi(accel_dev);
}
EXPORT_SYMBOL_GPL(adf_vf_isr_resource_free);
/**
* adf_vf_isr_resource_alloc() - Allocate IRQ for acceleration device
* @accel_dev: Pointer to acceleration device.
*
* Function allocates interrupts for acceleration device virtual function.
*
* Return: 0 on success, error code otherwise.
*/
int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
{
if (adf_enable_msi(accel_dev))
goto err_out;
if (adf_setup_pf2vf_bh(accel_dev))
goto err_disable_msi;
if (adf_setup_bh(accel_dev))
goto err_cleanup_pf2vf_bh;
if (adf_request_msi_irq(accel_dev))
goto err_cleanup_bh;
return 0;
err_cleanup_bh:
adf_cleanup_bh(accel_dev);
err_cleanup_pf2vf_bh:
adf_cleanup_pf2vf_bh(accel_dev);
err_disable_msi:
adf_disable_msi(accel_dev);
err_out:
return -EFAULT;
}
EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);
/**
* adf_flush_vf_wq() - Flush workqueue for VF
* @accel_dev: Pointer to acceleration device.
*
* Function disables the PF/VF interrupts on the VF so that no new messages
* are received and flushes the workqueue 'adf_vf_stop_wq'.
*
* Return: void.
*/
void adf_flush_vf_wq(struct adf_accel_dev *accel_dev)
{
adf_disable_pf2vf_interrupts(accel_dev);
flush_workqueue(adf_vf_stop_wq);
}
EXPORT_SYMBOL_GPL(adf_flush_vf_wq);
/**
* adf_init_vf_wq() - Init workqueue for VF
*
* Function init workqueue 'adf_vf_stop_wq' for VF.
*
* Return: 0 on success, error code otherwise.
*/
int __init adf_init_vf_wq(void)
{
adf_vf_stop_wq = alloc_workqueue("adf_vf_stop_wq", WQ_MEM_RECLAIM, 0);
return !adf_vf_stop_wq ? -EFAULT : 0;
}
void adf_exit_vf_wq(void)
{
if (adf_vf_stop_wq)
destroy_workqueue(adf_vf_stop_wq);
adf_vf_stop_wq = NULL;
}