1 files changed, 382 insertions, 0 deletions
diff --git a/drivers/crypto/qat/qat_common/adf_isr.c b/drivers/crypto/qat/qat_common/adf_isr.c
new file mode 100644
index 000000000..ad9e135b8
--- /dev/null
+++ b/drivers/crypto/qat/qat_common/adf_isr.c
@@ -0,0 +1,382 @@
+// 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 "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_MAX_NUM_VFS	32
+static struct workqueue_struct *adf_misc_wq;
+
+static int adf_enable_msix(struct adf_accel_dev *accel_dev)
+{
+	struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	u32 msix_num_entries = hw_data->num_banks + 1;
+	int ret;
+
+	if (hw_data->set_msix_rttable)
+		hw_data->set_msix_rttable(accel_dev);
+
+	ret = pci_alloc_irq_vectors(pci_dev_info->pci_dev, msix_num_entries,
+				    msix_num_entries, PCI_IRQ_MSIX);
+	if (unlikely(ret < 0)) {
+		dev_err(&GET_DEV(accel_dev),
+			"Failed to allocate %d MSI-X vectors\n",
+			msix_num_entries);
+		return ret;
+	}
+	return 0;
+}
+
+static void adf_disable_msix(struct adf_accel_pci *pci_dev_info)
+{
+	pci_free_irq_vectors(pci_dev_info->pci_dev);
+}
+
+static irqreturn_t adf_msix_isr_bundle(int irq, void *bank_ptr)
+{
+	struct adf_etr_bank_data *bank = bank_ptr;
+	struct adf_hw_csr_ops *csr_ops = GET_CSR_OPS(bank->accel_dev);
+
+	csr_ops->write_csr_int_flag_and_col(bank->csr_addr, bank->bank_number,
+					    0);
+	tasklet_hi_schedule(&bank->resp_handler);
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PCI_IOV
+void adf_enable_vf2pf_interrupts(struct adf_accel_dev *accel_dev, u32 vf_mask)
+{
+	void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&accel_dev->pf.vf2pf_ints_lock, flags);
+	GET_PFVF_OPS(accel_dev)->enable_vf2pf_interrupts(pmisc_addr, vf_mask);
+	spin_unlock_irqrestore(&accel_dev->pf.vf2pf_ints_lock, flags);
+}
+
+void adf_disable_all_vf2pf_interrupts(struct adf_accel_dev *accel_dev)
+{
+	void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&accel_dev->pf.vf2pf_ints_lock, flags);
+	GET_PFVF_OPS(accel_dev)->disable_all_vf2pf_interrupts(pmisc_addr);
+	spin_unlock_irqrestore(&accel_dev->pf.vf2pf_ints_lock, flags);
+}
+
+static u32 adf_disable_pending_vf2pf_interrupts(struct adf_accel_dev *accel_dev)
+{
+	void __iomem *pmisc_addr = adf_get_pmisc_base(accel_dev);
+	u32 pending;
+
+	spin_lock(&accel_dev->pf.vf2pf_ints_lock);
+	pending = GET_PFVF_OPS(accel_dev)->disable_pending_vf2pf_interrupts(pmisc_addr);
+	spin_unlock(&accel_dev->pf.vf2pf_ints_lock);
+
+	return pending;
+}
+
+static bool adf_handle_vf2pf_int(struct adf_accel_dev *accel_dev)
+{
+	bool irq_handled = false;
+	unsigned long vf_mask;
+
+	/* Get the interrupt sources triggered by VFs, except for those already disabled */
+	vf_mask = adf_disable_pending_vf2pf_interrupts(accel_dev);
+	if (vf_mask) {
+		struct adf_accel_vf_info *vf_info;
+		int i;
+
+		/*
+		 * Handle VF2PF interrupt unless the VF is malicious and
+		 * is attempting to flood the host OS with VF2PF interrupts.
+		 */
+		for_each_set_bit(i, &vf_mask, ADF_MAX_NUM_VFS) {
+			vf_info = accel_dev->pf.vf_info + i;
+
+			if (!__ratelimit(&vf_info->vf2pf_ratelimit)) {
+				dev_info(&GET_DEV(accel_dev),
+					 "Too many ints from VF%d\n",
+					  vf_info->vf_nr);
+				continue;
+			}
+
+			adf_schedule_vf2pf_handler(vf_info);
+			irq_handled = true;
+		}
+	}
+	return irq_handled;
+}
+#endif /* CONFIG_PCI_IOV */
+
+static bool adf_handle_pm_int(struct adf_accel_dev *accel_dev)
+{
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+
+	if (hw_data->handle_pm_interrupt &&
+	    hw_data->handle_pm_interrupt(accel_dev))
+		return true;
+
+	return false;
+}
+
+static irqreturn_t adf_msix_isr_ae(int irq, void *dev_ptr)
+{
+	struct adf_accel_dev *accel_dev = dev_ptr;
+
+#ifdef CONFIG_PCI_IOV
+	/* If SR-IOV is enabled (vf_info is non-NULL), check for VF->PF ints */
+	if (accel_dev->pf.vf_info && adf_handle_vf2pf_int(accel_dev))
+		return IRQ_HANDLED;
+#endif /* CONFIG_PCI_IOV */
+
+	if (adf_handle_pm_int(accel_dev))
+		return IRQ_HANDLED;
+
+	dev_dbg(&GET_DEV(accel_dev), "qat_dev%d spurious AE interrupt\n",
+		accel_dev->accel_id);
+
+	return IRQ_NONE;
+}
+
+static void adf_free_irqs(struct adf_accel_dev *accel_dev)
+{
+	struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	struct adf_irq *irqs = pci_dev_info->msix_entries.irqs;
+	struct adf_etr_data *etr_data = accel_dev->transport;
+	int clust_irq = hw_data->num_banks;
+	int irq, i = 0;
+
+	if (pci_dev_info->msix_entries.num_entries > 1) {
+		for (i = 0; i < hw_data->num_banks; i++) {
+			if (irqs[i].enabled) {
+				irq = pci_irq_vector(pci_dev_info->pci_dev, i);
+				irq_set_affinity_hint(irq, NULL);
+				free_irq(irq, &etr_data->banks[i]);
+			}
+		}
+	}
+
+	if (irqs[i].enabled) {
+		irq = pci_irq_vector(pci_dev_info->pci_dev, clust_irq);
+		free_irq(irq, accel_dev);
+	}
+}
+
+static int adf_request_irqs(struct adf_accel_dev *accel_dev)
+{
+	struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	struct adf_irq *irqs = pci_dev_info->msix_entries.irqs;
+	struct adf_etr_data *etr_data = accel_dev->transport;
+	int clust_irq = hw_data->num_banks;
+	int ret, irq, i = 0;
+	char *name;
+
+	/* Request msix irq for all banks unless SR-IOV enabled */
+	if (!accel_dev->pf.vf_info) {
+		for (i = 0; i < hw_data->num_banks; i++) {
+			struct adf_etr_bank_data *bank = &etr_data->banks[i];
+			unsigned int cpu, cpus = num_online_cpus();
+
+			name = irqs[i].name;
+			snprintf(name, ADF_MAX_MSIX_VECTOR_NAME,
+				 "qat%d-bundle%d", accel_dev->accel_id, i);
+			irq = pci_irq_vector(pci_dev_info->pci_dev, i);
+			if (unlikely(irq < 0)) {
+				dev_err(&GET_DEV(accel_dev),
+					"Failed to get IRQ number of device vector %d - %s\n",
+					i, name);
+				ret = irq;
+				goto err;
+			}
+			ret = request_irq(irq, adf_msix_isr_bundle, 0,
+					  &name[0], bank);
+			if (ret) {
+				dev_err(&GET_DEV(accel_dev),
+					"Failed to allocate IRQ %d for %s\n",
+					irq, name);
+				goto err;
+			}
+
+			cpu = ((accel_dev->accel_id * hw_data->num_banks) +
+			       i) % cpus;
+			irq_set_affinity_hint(irq, get_cpu_mask(cpu));
+			irqs[i].enabled = true;
+		}
+	}
+
+	/* Request msix irq for AE */
+	name = irqs[i].name;
+	snprintf(name, ADF_MAX_MSIX_VECTOR_NAME,
+		 "qat%d-ae-cluster", accel_dev->accel_id);
+	irq = pci_irq_vector(pci_dev_info->pci_dev, clust_irq);
+	if (unlikely(irq < 0)) {
+		dev_err(&GET_DEV(accel_dev),
+			"Failed to get IRQ number of device vector %d - %s\n",
+			i, name);
+		ret = irq;
+		goto err;
+	}
+	ret = request_irq(irq, adf_msix_isr_ae, 0, &name[0], accel_dev);
+	if (ret) {
+		dev_err(&GET_DEV(accel_dev),
+			"Failed to allocate IRQ %d for %s\n", irq, name);
+		goto err;
+	}
+	irqs[i].enabled = true;
+	return ret;
+err:
+	adf_free_irqs(accel_dev);
+	return ret;
+}
+
+static int adf_isr_alloc_msix_vectors_data(struct adf_accel_dev *accel_dev)
+{
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	u32 msix_num_entries = 1;
+	struct adf_irq *irqs;
+
+	/* If SR-IOV is disabled (vf_info is NULL), add entries for each bank */
+	if (!accel_dev->pf.vf_info)
+		msix_num_entries += hw_data->num_banks;
+
+	irqs = kzalloc_node(msix_num_entries * sizeof(*irqs),
+			    GFP_KERNEL, dev_to_node(&GET_DEV(accel_dev)));
+	if (!irqs)
+		return -ENOMEM;
+
+	accel_dev->accel_pci_dev.msix_entries.num_entries = msix_num_entries;
+	accel_dev->accel_pci_dev.msix_entries.irqs = irqs;
+	return 0;
+}
+
+static void adf_isr_free_msix_vectors_data(struct adf_accel_dev *accel_dev)
+{
+	kfree(accel_dev->accel_pci_dev.msix_entries.irqs);
+	accel_dev->accel_pci_dev.msix_entries.irqs = NULL;
+}
+
+static int adf_setup_bh(struct adf_accel_dev *accel_dev)
+{
+	struct adf_etr_data *priv_data = accel_dev->transport;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	int i;
+
+	for (i = 0; i < hw_data->num_banks; i++)
+		tasklet_init(&priv_data->banks[i].resp_handler,
+			     adf_response_handler,
+			     (unsigned long)&priv_data->banks[i]);
+	return 0;
+}
+
+static void adf_cleanup_bh(struct adf_accel_dev *accel_dev)
+{
+	struct adf_etr_data *priv_data = accel_dev->transport;
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	int i;
+
+	for (i = 0; i < hw_data->num_banks; i++) {
+		tasklet_disable(&priv_data->banks[i].resp_handler);
+		tasklet_kill(&priv_data->banks[i].resp_handler);
+	}
+}
+
+/**
+ * adf_isr_resource_free() - Free IRQ for acceleration device
+ * @accel_dev:  Pointer to acceleration device.
+ *
+ * Function frees interrupts for acceleration device.
+ */
+void adf_isr_resource_free(struct adf_accel_dev *accel_dev)
+{
+	adf_free_irqs(accel_dev);
+	adf_cleanup_bh(accel_dev);
+	adf_disable_msix(&accel_dev->accel_pci_dev);
+	adf_isr_free_msix_vectors_data(accel_dev);
+}
+EXPORT_SYMBOL_GPL(adf_isr_resource_free);
+
+/**
+ * adf_isr_resource_alloc() - Allocate IRQ for acceleration device
+ * @accel_dev:  Pointer to acceleration device.
+ *
+ * Function allocates interrupts for acceleration device.
+ *
+ * Return: 0 on success, error code otherwise.
+ */
+int adf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
+{
+	int ret;
+
+	ret = adf_isr_alloc_msix_vectors_data(accel_dev);
+	if (ret)
+		goto err_out;
+
+	ret = adf_enable_msix(accel_dev);
+	if (ret)
+		goto err_free_msix_table;
+
+	ret = adf_setup_bh(accel_dev);
+	if (ret)
+		goto err_disable_msix;
+
+	ret = adf_request_irqs(accel_dev);
+	if (ret)
+		goto err_cleanup_bh;
+
+	return 0;
+
+err_cleanup_bh:
+	adf_cleanup_bh(accel_dev);
+
+err_disable_msix:
+	adf_disable_msix(&accel_dev->accel_pci_dev);
+
+err_free_msix_table:
+	adf_isr_free_msix_vectors_data(accel_dev);
+
+err_out:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(adf_isr_resource_alloc);
+
+/**
+ * adf_init_misc_wq() - Init misc workqueue
+ *
+ * Function init workqueue 'qat_misc_wq' for general purpose.
+ *
+ * Return: 0 on success, error code otherwise.
+ */
+int __init adf_init_misc_wq(void)
+{
+	adf_misc_wq = alloc_workqueue("qat_misc_wq", WQ_MEM_RECLAIM, 0);
+
+	return !adf_misc_wq ? -ENOMEM : 0;
+}
+
+void adf_exit_misc_wq(void)
+{
+	if (adf_misc_wq)
+		destroy_workqueue(adf_misc_wq);
+
+	adf_misc_wq = NULL;
+}
+
+bool adf_misc_wq_queue_work(struct work_struct *work)
+{
+	return queue_work(adf_misc_wq, work);
+}