path: root/drivers/dma/idxd/device.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/dmaengine.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <uapi/linux/idxd.h>
#include "../dmaengine.h"
#include "idxd.h"
#include "registers.h"

static void idxd_cmd_exec(struct idxd_device *idxd, int cmd_code, u32 operand,
			  u32 *status);
static void idxd_device_wqs_clear_state(struct idxd_device *idxd);
static void idxd_wq_disable_cleanup(struct idxd_wq *wq);

/* Interrupt control bits */
void idxd_unmask_error_interrupts(struct idxd_device *idxd)
{
	union genctrl_reg genctrl;

	genctrl.bits = ioread32(idxd->reg_base + IDXD_GENCTRL_OFFSET);
	genctrl.softerr_int_en = 1;
	genctrl.halt_int_en = 1;
	iowrite32(genctrl.bits, idxd->reg_base + IDXD_GENCTRL_OFFSET);
}

void idxd_mask_error_interrupts(struct idxd_device *idxd)
{
	union genctrl_reg genctrl;

	genctrl.bits = ioread32(idxd->reg_base + IDXD_GENCTRL_OFFSET);
	genctrl.softerr_int_en = 0;
	genctrl.halt_int_en = 0;
	iowrite32(genctrl.bits, idxd->reg_base + IDXD_GENCTRL_OFFSET);
}

static void free_hw_descs(struct idxd_wq *wq)
{
	int i;

	for (i = 0; i < wq->num_descs; i++)
		kfree(wq->hw_descs[i]);

	kfree(wq->hw_descs);
}

static int alloc_hw_descs(struct idxd_wq *wq, int num)
{
	struct device *dev = &wq->idxd->pdev->dev;
	int i;
	int node = dev_to_node(dev);

	wq->hw_descs = kcalloc_node(num, sizeof(struct dsa_hw_desc *),
				    GFP_KERNEL, node);
	if (!wq->hw_descs)
		return -ENOMEM;

	for (i = 0; i < num; i++) {
		wq->hw_descs[i] = kzalloc_node(sizeof(*wq->hw_descs[i]),
					       GFP_KERNEL, node);
		if (!wq->hw_descs[i]) {
			free_hw_descs(wq);
			return -ENOMEM;
		}
	}

	return 0;
}

static void free_descs(struct idxd_wq *wq)
{
	int i;

	for (i = 0; i < wq->num_descs; i++)
		kfree(wq->descs[i]);

	kfree(wq->descs);
}

static int alloc_descs(struct idxd_wq *wq, int num)
{
	struct device *dev = &wq->idxd->pdev->dev;
	int i;
	int node = dev_to_node(dev);

	wq->descs = kcalloc_node(num, sizeof(struct idxd_desc *),
				 GFP_KERNEL, node);
	if (!wq->descs)
		return -ENOMEM;

	for (i = 0; i < num; i++) {
		wq->descs[i] = kzalloc_node(sizeof(*wq->descs[i]),
					    GFP_KERNEL, node);
		if (!wq->descs[i]) {
			free_descs(wq);
			return -ENOMEM;
		}
	}

	return 0;
}

/* WQ control bits */
int idxd_wq_alloc_resources(struct idxd_wq *wq)
{
	struct idxd_device *idxd = wq->idxd;
	struct device *dev = &idxd->pdev->dev;
	int rc, num_descs, i;

	if (wq->type != IDXD_WQT_KERNEL)
		return 0;

	num_descs = wq_dedicated(wq) ? wq->size : wq->threshold;
	wq->num_descs = num_descs;

	rc = alloc_hw_descs(wq, num_descs);
	if (rc < 0)
		return rc;

	wq->compls_size = num_descs * idxd->data->compl_size;
	wq->compls = dma_alloc_coherent(dev, wq->compls_size, &wq->compls_addr, GFP_KERNEL);
	if (!wq->compls) {
		rc = -ENOMEM;
		goto fail_alloc_compls;
	}

	rc = alloc_descs(wq, num_descs);
	if (rc < 0)
		goto fail_alloc_descs;

	rc = sbitmap_queue_init_node(&wq->sbq, num_descs, -1, false, GFP_KERNEL,
				     dev_to_node(dev));
	if (rc < 0)
		goto fail_sbitmap_init;

	for (i = 0; i < num_descs; i++) {
		struct idxd_desc *desc = wq->descs[i];

		desc->hw = wq->hw_descs[i];
		if (idxd->data->type == IDXD_TYPE_DSA)
			desc->completion = &wq->compls[i];
		else if (idxd->data->type == IDXD_TYPE_IAX)
			desc->iax_completion = &wq->iax_compls[i];
		desc->compl_dma = wq->compls_addr + idxd->data->compl_size * i;
		desc->id = i;
		desc->wq = wq;
		desc->cpu = -1;
	}

	return 0;

 fail_sbitmap_init:
	free_descs(wq);
 fail_alloc_descs:
	dma_free_coherent(dev, wq->compls_size, wq->compls, wq->compls_addr);
 fail_alloc_compls:
	free_hw_descs(wq);
	return rc;
}

void idxd_wq_free_resources(struct idxd_wq *wq)
{
	struct device *dev = &wq->idxd->pdev->dev;

	if (wq->type != IDXD_WQT_KERNEL)
		return;

	free_hw_descs(wq);
	free_descs(wq);
	dma_free_coherent(dev, wq->compls_size, wq->compls, wq->compls_addr);
	sbitmap_queue_free(&wq->sbq);
}

int idxd_wq_enable(struct idxd_wq *wq)
{
	struct idxd_device *idxd = wq->idxd;
	struct device *dev = &idxd->pdev->dev;
	u32 status;

	if (wq->state == IDXD_WQ_ENABLED) {
		dev_dbg(dev, "WQ %d already enabled\n", wq->id);
		return 0;
	}

	idxd_cmd_exec(idxd, IDXD_CMD_ENABLE_WQ, wq->id, &status);

	if (status != IDXD_CMDSTS_SUCCESS &&
	    status != IDXD_CMDSTS_ERR_WQ_ENABLED) {
		dev_dbg(dev, "WQ enable failed: %#x\n", status);
		return -ENXIO;
	}

	wq->state = IDXD_WQ_ENABLED;
	set_bit(wq->id, idxd->wq_enable_map);
	dev_dbg(dev, "WQ %d enabled\n", wq->id);
	return 0;
}

int idxd_wq_disable(struct idxd_wq *wq, bool reset_config)
{
	struct idxd_device *idxd = wq->idxd;
	struct device *dev = &idxd->pdev->dev;
	u32 status, operand;

	dev_dbg(dev, "Disabling WQ %d\n", wq->id);

	if (wq->state != IDXD_WQ_ENABLED) {
		dev_dbg(dev, "WQ %d in wrong state: %d\n", wq->id, wq->state);
		return 0;
	}

	operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
	idxd_cmd_exec(idxd, IDXD_CMD_DISABLE_WQ, operand, &status);

	if (status != IDXD_CMDSTS_SUCCESS) {
		dev_dbg(dev, "WQ disable failed: %#x\n", status);
		return -ENXIO;
	}

	if (reset_config)
		idxd_wq_disable_cleanup(wq);
	clear_bit(wq->id, idxd->wq_enable_map);
	wq->state = IDXD_WQ_DISABLED;
	dev_dbg(dev, "WQ %d disabled\n", wq->id);
	return 0;
}

void idxd_wq_drain(struct idxd_wq *wq)
{
	struct idxd_device *idxd = wq->idxd;
	struct device *dev = &idxd->pdev->dev;
	u32 operand;

	if (wq->state != IDXD_WQ_ENABLED) {
		dev_dbg(dev, "WQ %d in wrong state: %d\n", wq->id, wq->state);
		return;
	}

	dev_dbg(dev, "Draining WQ %d\n", wq->id);
	operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
	idxd_cmd_exec(idxd, IDXD_CMD_DRAIN_WQ, operand, NULL);
}

void idxd_wq_reset(struct idxd_wq *wq)
{
	struct idxd_device *idxd = wq->idxd;
	struct device *dev = &idxd->pdev->dev;
	u32 operand;

	if (wq->state != IDXD_WQ_ENABLED) {
		dev_dbg(dev, "WQ %d in wrong state: %d\n", wq->id, wq->state);
		return;
	}

	operand = BIT(wq->id % 16) | ((wq->id / 16) << 16);
	idxd_cmd_exec(idxd, IDXD_CMD_RESET_WQ, operand, NULL);
	idxd_wq_disable_cleanup(wq);
}

int idxd_wq_map_portal(struct idxd_wq *wq)
{
	struct idxd_device *idxd = wq->idxd;
	struct pci_dev *pdev = idxd->pdev;
	struct device *dev = &pdev->dev;
	resource_size_t start;

	start = pci_resource_start(pdev, IDXD_WQ_BAR);
	start += idxd_get_wq_portal_full_offset(wq->id, IDXD_PORTAL_LIMITED);

	wq->portal = devm_ioremap(dev, start, IDXD_PORTAL_SIZE);
	if (!wq->portal)
		return -ENOMEM;

	return 0;
}

void idxd_wq_unmap_portal(struct idxd_wq *wq)
{
	struct device *dev = &wq->idxd->pdev->dev;

	devm_iounmap(dev, wq->portal);
	wq->portal = NULL;
	wq->portal_offset = 0;
}

void idxd_wqs_unmap_portal(struct idxd_device *idxd)
{
	int i;

	for (i = 0; i < idxd->max_wqs; i++) {
		struct idxd_wq *wq = idxd->wqs[i];

		if (wq->portal)
			idxd_wq_unmap_portal(wq);
	}
}

static void __idxd_wq_set_priv_locked(struct idxd_wq *wq, int priv)
{
	struct idxd_device *idxd = wq->idxd;
	union wqcfg wqcfg;
	unsigned int offset;

	offset = WQCFG_OFFSET(idxd, wq->id, WQCFG_PRIVL_IDX);
	spin_lock(&idxd->dev_lock);
	wqcfg.bits[WQCFG_PRIVL_IDX] = ioread32(idxd->reg_base + offset);
	wqcfg.priv = priv;
	wq->wqcfg->bits[WQCFG_PRIVL_IDX] = wqcfg.bits[WQCFG_PRIVL_IDX];
	iowrite32(wqcfg.bits[WQCFG_PRIVL_IDX], idxd->reg_base + offset);
	spin_unlock(&idxd->dev_lock);
}

static void __idxd_wq_set_pasid_locked(struct idxd_wq *wq, int pasid)
{
	struct idxd_device *idxd = wq->idxd;
	union wqcfg wqcfg;
	unsigned int offset;

	offset = WQCFG_OFFSET(idxd, wq->id, WQCFG_PASID_IDX);
	spin_lock(&idxd->dev_lock);
	wqcfg.bits[WQCFG_PASID_IDX] = ioread32(idxd->reg_base + offset);
	wqcfg.pasid_en = 1;
	wqcfg.pasid = pasid;
	w