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 "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;

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

	list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
		if (!afu_dev->driver)
			continue;

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

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

			if (afu_dev->driver->err_handler &&
			    afu_dev->driver->err_handler->slot_reset)
				afu_dev->driver->err_handler->slot_reset(afu_dev);
		break;
		case CXL_RESUME_EVENT:
			if (afu_dev->driver->err_handler &&
			    afu_dev->driver->err_handler->resume)
				afu_dev->driver->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);
	if (!vpd_buf)
		return -ENOMEM;

	le = (struct sg_list *)get_zeroed_page(GFP_KERNEL);
	if (!le) {
		rc = -ENOMEM;
		goto err1;
	}

	for (i = 0; i < entries; i++) {
		vpd_buf[i] = (unsigned long *)get_zeroed_page(GFP_KERNEL);
		if (!vpd_buf[i]) {
			rc = -ENOMEM;
			goto err2;
		}
		le[i].phys_addr = cpu_to_be64(virt_to_phys(vpd_buf[i]));
		le[i].len = cpu_to_be64(SG_BUFFER_SIZE);
		if ((i == (entries - 1)) && mod)
			le[i].len = cpu_to_be64(mod);
	}

	if (adapter)
		rc = cxl_h_collect_vpd_adapter(adapter->guest->handle,
					virt_to_phys(le), entries, &out);
	else
		rc = cxl_h_collect_vpd(afu->guest->handle, 0,
				virt_to_phys<