/*
* Copyright 2014-2016 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <asm/pnv-pci.h>
#include <asm/opal.h>
#include "pci.h"
int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
struct pnv_ioda_pe *pe;
int rc;
pe = pnv_ioda_get_pe(dev);
if (!pe)
return -ENODEV;
pe_info(pe, "Switching PHB to CXL\n");
rc = opal_pci_set_phb_cxl_mode(phb->opal_id, mode, pe->pe_number);
if (rc == OPAL_UNSUPPORTED)
dev_err(&dev->dev, "Required cxl mode not supported by firmware - update skiboot\n");
else if (rc)
dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);
return rc;
}
EXPORT_SYMBOL(pnv_phb_to_cxl_mode);
/* Find PHB for cxl dev and allocate MSI hwirqs?
* Returns the absolute hardware IRQ number
*/
int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
int hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, num);
if (hwirq < 0) {
dev_warn(&dev->dev, "Failed to find a free MSI\n");
return -ENOSPC;
}
return phb->msi_base + hwirq;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirqs);
void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, num);
}
EXPORT_SYMBOL(pnv_cxl_release_hwirqs);
void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
int i, hwirq;
for (i = 1; i < CXL_IRQ_RANGES; i++) {
if (!irqs->range[i])
continue;
pr_devel("cxl release irq range 0x%x: offset: 0x%lx limit: %ld\n",
i, irqs->offset[i],
irqs->range[i]);
hwirq = irqs->offset[i] - phb->msi_base;
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
irqs->range[i]);
}
}
EXPORT_SYMBOL(pnv_cxl_release_hwirq_ranges);
int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
struct pci_dev *dev, int num)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
int i, hwirq, try;
memset(irqs, 0, sizeof(struct cxl_irq_ranges));
/* 0 is reserved for the multiplexed PSL DSI interrupt */
for (i = 1; i < CXL_IRQ_RANGES && num; i++) {
try = num;
while (try) {
hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, try);
if (hwirq >= 0)
break;
try /= 2;
}
if (!try)
goto fail;
irqs->offset[i] = phb->msi_base + hwirq;
irqs->range[i] = try;
pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx limit: %li\n",
i, irqs->offset[i], irqs->range[i]);
num -= try;
}
if (num)
goto fail;
return 0;
fail:
pnv_cxl_release_hwirq_ranges(irqs, dev);
return -ENOSPC;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);
int pnv_cxl_get_irq_count(struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
return phb->msi_bmp.irq_count;
}
EXPORT_SYMBOL(pnv_cxl_get_irq_count);
int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
unsigned int virq)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
unsigned int xive_num = hwirq - phb->msi_base;
struct pnv_ioda_pe *pe;
int rc;
if (!(pe = pnv_ioda_get_pe(dev)))
return -ENODEV;
/* Assign XIVE to PE */
rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
if (rc) {
pe_warn(pe, "%s: OPAL error %d setting msi_base 0x%x "
"hwirq 0x%x XIVE 0x%x PE\n",
pci_name(dev), rc, phb->msi_base, hwirq, xive_num);
return -EIO;
}
pnv_set_msi_irq_chip(phb, virq);
return 0;
}
EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
#if IS_MODULE(CONFIG_CXL)
static inline int get_cxl_module(void)
{
struct module *cxl_module;
mutex_lock(&module_mutex);
cxl_module = find_module("cxl");
if (cxl_module)
__module_get(cxl_module);
mutex_unlock(&module_mutex);
if (!cxl_module)
return -ENODEV;
return 0;
}
#else
static inline int get_cxl_module(void) { return 0; }
#endif
