1 files changed, 307 insertions, 0 deletions
diff --git a/drivers/crypto/qat/qat_common/adf_vf_isr.c b/drivers/crypto/qat/qat_common/adf_vf_isr.c
new file mode 100644
index 000000000..fa1b3a941
--- /dev/null
+++ b/drivers/crypto/qat/qat_common/adf_vf_isr.c
@@ -0,0 +1,307 @@
+// 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"
+#include "adf_pf2vf_msg.h"
+
+#define ADF_VINTSOU_OFFSET	0x204
+#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;
+};
+
+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_enable_msi(pci_dev_info->pci_dev);
+
+	if (stat) {
+		dev_err(&GET_DEV(accel_dev),
+			"Failed to enable MSI interrupts\n");
+		return stat;
+	}
+
+	accel_dev->vf.irq_name = kzalloc(ADF_MAX_MSIX_VECTOR_NAME, GFP_KERNEL);
+	if (!accel_dev->vf.irq_name)
+		return -ENOMEM;
+
+	return stat;
+}
+
+static void adf_disable_msi(struct adf_accel_dev *accel_dev)
+{
+	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
+
+	kfree(accel_dev->vf.irq_name);
+	pci_disable_msi(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_stop(accel_dev);
+	adf_dev_shutdown(accel_dev);
+
+	/* Re-enable PF2VF interrupts */
+	adf_enable_pf2vf_interrupts(accel_dev);
+	kfree(stop_data);
+}
+
+static void adf_pf2vf_bh_handler(void *data)
+{
+	struct adf_accel_dev *accel_dev = data;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	struct adf_bar *pmisc =
+			&GET_BARS(accel_dev)[hw_data->get_misc_bar_id(hw_data)];
+	void __iomem *pmisc_bar_addr = pmisc->virt_addr;
+	u32 msg;
+
+	/* Read the message from PF */
+	msg = ADF_CSR_RD(pmisc_bar_addr, hw_data->get_pf2vf_offset(0));
+	if (!(msg & ADF_PF2VF_INT)) {
+		dev_info(&GET_DEV(accel_dev),
+			 "Spurious PF2VF interrupt, msg %X. Ignored\n", msg);
+		goto out;
+	}
+
+	if (!(msg & ADF_PF2VF_MSGORIGIN_SYSTEM))
+		/* Ignore legacy non-system (non-kernel) PF2VF messages */
+		goto err;
+
+	switch ((msg & ADF_PF2VF_MSGTYPE_MASK) >> ADF_PF2VF_MSGTYPE_SHIFT) {
+	case ADF_PF2VF_MSGTYPE_RESTARTING: {
+		struct adf_vf_stop_data *stop_data;
+
+		dev_dbg(&GET_DEV(accel_dev),
+			"Restarting msg received from PF 0x%x\n", msg);
+
+		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;
+		}
+		stop_data->accel_dev = accel_dev;
+		INIT_WORK(&stop_data->work, adf_dev_stop_async);
+		queue_work(adf_vf_stop_wq, &stop_data->work);
+		/* To ack, clear the PF2VFINT bit */
+		msg &= ~ADF_PF2VF_INT;
+		ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
+		return;
+	}
+	case ADF_PF2VF_MSGTYPE_VERSION_RESP:
+		dev_dbg(&GET_DEV(accel_dev),
+			"Version resp received from PF 0x%x\n", msg);
+		accel_dev->vf.pf_version =
+			(msg & ADF_PF2VF_VERSION_RESP_VERS_MASK) >>
+			ADF_PF2VF_VERSION_RESP_VERS_SHIFT;
+		accel_dev->vf.compatible =
+			(msg & ADF_PF2VF_VERSION_RESP_RESULT_MASK) >>
+			ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
+		complete(&accel_dev->vf.iov_msg_completion);
+		break;
+	default:
+		goto err;
+	}
+
+	/* To ack, clear the PF2VFINT bit */
+	msg &= ~ADF_PF2VF_INT;
+	ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
+
+out:
+	/* Re-enable PF2VF interrupts */
+	adf_enable_pf2vf_interrupts(accel_dev);
+	return;
+err:
+	dev_err(&GET_DEV(accel_dev),
+		"Unknown message from PF (0x%x); leaving PF2VF ints disabled\n",
+		msg);
+}
+
+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_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;
+
+	/* Read VF INT source CSR to determine the source of VF interrupt */
+	v_int = ADF_CSR_RD(pmisc_bar_addr, ADF_VINTSOU_OFFSET);
+
+	/* 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 */
+		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));
+
+	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);
+
+	irq_set_affinity_hint(pdev->irq, NULL);
+	free_irq(pdev->irq, (void *)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);
+
+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;
+}