path: root/drivers/misc/cxl/guest.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2015 IBM Corp.
 */

#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/irqdomain.h>
#include <linux/platform_device.h>

#include "cxl.h"
#include "hcalls.h"
#include "trace.h"

#define CXL_ERROR_DETECTED_EVENT	1
#define CXL_SLOT_RESET_EVENT		2
#define CXL_RESUME_EVENT		3

static void pci_error_handlers(struct cxl_afu *afu,
				int bus_error_event,
				pci_channel_state_t state)
{
	struct pci_dev *afu_dev;
	struct pci_driver *afu_drv;
	const struct pci_error_handlers *err_handler;

	if (afu->phb == NULL)
		return;

	list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
		afu_drv = to_pci_driver(afu_dev->dev.driver);
		if (!afu_drv)
			continue;

		err_handler = afu_drv->err_handler;
		switch (bus_error_event) {
		case CXL_ERROR_DETECTED_EVENT:
			afu_dev->error_state = state;

			if (err_handler &&
			    err_handler->error_detected)
				err_handler->error_detected(afu_dev, state);
			break;
		case CXL_SLOT_RESET_EVENT:
			afu_dev->error_state = state;

			if (err_handler &&
			    err_handler->slot_reset)
				err_handler->slot_reset(afu_dev);
			break;
		case CXL_RESUME_EVENT:
			if (err_handler &&
			    err_handler->resume)
				err_handler->resume(afu_dev);
			break;
		}
	}
}

static irqreturn_t guest_handle_psl_slice_error(struct cxl_context *ctx, u64 dsisr,
					u64 errstat)
{
	pr_devel("in %s\n", __func__);
	dev_crit(&ctx->afu->dev, "PSL ERROR STATUS: 0x%.16llx\n", errstat);

	return cxl_ops->ack_irq(ctx, 0, errstat);
}

static ssize_t guest_collect_vpd(struct cxl *adapter, struct cxl_afu *afu,
			void *buf, size_t len)
{
	unsigned int entries, mod;
	unsigned long **vpd_buf = NULL;
	struct sg_list *le;
	int rc = 0, i, tocopy;
	u64 out = 0;

	if (buf == NULL)
		return -EINVAL;

	/* number of entries in the list */
	entries = len / SG_BUFFER_SIZE;
	mod = len % SG_BUFFER_SIZE;
	if (mod)
		entries++;

	if (entries > SG_MAX_ENTRIES) {
		entries = SG_MAX_ENTRIES;
		len = SG_MAX_ENTRIES * SG_BUFFER_SIZE;
		mod = 0;
	}

	vpd_buf = kcalloc(entries, sizeof(unsigned long *), GFP_KERNEL