1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright 2014-2016 IBM Corp.
4  */
5 
6 #include <linux/module.h>
7 #include <asm/pnv-pci.h>
8 #include <asm/opal.h>
9 
10 #include "pci.h"
11 
pnv_phb_to_cxl_mode(struct pci_dev * dev,uint64_t mode)12 int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode)
13 {
14 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
15 	struct pnv_phb *phb = hose->private_data;
16 	struct pnv_ioda_pe *pe;
17 	int rc;
18 
19 	pe = pnv_ioda_get_pe(dev);
20 	if (!pe)
21 		return -ENODEV;
22 
23 	pe_info(pe, "Switching PHB to CXL\n");
24 
25 	rc = opal_pci_set_phb_cxl_mode(phb->opal_id, mode, pe->pe_number);
26 	if (rc == OPAL_UNSUPPORTED)
27 		dev_err(&dev->dev, "Required cxl mode not supported by firmware - update skiboot\n");
28 	else if (rc)
29 		dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);
30 
31 	return rc;
32 }
33 EXPORT_SYMBOL(pnv_phb_to_cxl_mode);
34 
35 /* Find PHB for cxl dev and allocate MSI hwirqs?
36  * Returns the absolute hardware IRQ number
37  */
pnv_cxl_alloc_hwirqs(struct pci_dev * dev,int num)38 int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num)
39 {
40 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
41 	struct pnv_phb *phb = hose->private_data;
42 	int hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, num);
43 
44 	if (hwirq < 0) {
45 		dev_warn(&dev->dev, "Failed to find a free MSI\n");
46 		return -ENOSPC;
47 	}
48 
49 	return phb->msi_base + hwirq;
50 }
51 EXPORT_SYMBOL(pnv_cxl_alloc_hwirqs);
52 
pnv_cxl_release_hwirqs(struct pci_dev * dev,int hwirq,int num)53 void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num)
54 {
55 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
56 	struct pnv_phb *phb = hose->private_data;
57 
58 	msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, num);
59 }
60 EXPORT_SYMBOL(pnv_cxl_release_hwirqs);
61 
pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges * irqs,struct pci_dev * dev)62 void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
63 				  struct pci_dev *dev)
64 {
65 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
66 	struct pnv_phb *phb = hose->private_data;
67 	int i, hwirq;
68 
69 	for (i = 1; i < CXL_IRQ_RANGES; i++) {
70 		if (!irqs->range[i])
71 			continue;
72 		pr_devel("cxl release irq range 0x%x: offset: 0x%lx  limit: %ld\n",
73 			 i, irqs->offset[i],
74 			 irqs->range[i]);
75 		hwirq = irqs->offset[i] - phb->msi_base;
76 		msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
77 				       irqs->range[i]);
78 	}
79 }
80 EXPORT_SYMBOL(pnv_cxl_release_hwirq_ranges);
81 
pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges * irqs,struct pci_dev * dev,int num)82 int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
83 			       struct pci_dev *dev, int num)
84 {
85 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
86 	struct pnv_phb *phb = hose->private_data;
87 	int i, hwirq, try;
88 
89 	memset(irqs, 0, sizeof(struct cxl_irq_ranges));
90 
91 	/* 0 is reserved for the multiplexed PSL DSI interrupt */
92 	for (i = 1; i < CXL_IRQ_RANGES && num; i++) {
93 		try = num;
94 		while (try) {
95 			hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, try);
96 			if (hwirq >= 0)
97 				break;
98 			try /= 2;
99 		}
100 		if (!try)
101 			goto fail;
102 
103 		irqs->offset[i] = phb->msi_base + hwirq;
104 		irqs->range[i] = try;
105 		pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx  limit: %li\n",
106 			 i, irqs->offset[i], irqs->range[i]);
107 		num -= try;
108 	}
109 	if (num)
110 		goto fail;
111 
112 	return 0;
113 fail:
114 	pnv_cxl_release_hwirq_ranges(irqs, dev);
115 	return -ENOSPC;
116 }
117 EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);
118 
pnv_cxl_get_irq_count(struct pci_dev * dev)119 int pnv_cxl_get_irq_count(struct pci_dev *dev)
120 {
121 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
122 	struct pnv_phb *phb = hose->private_data;
123 
124 	return phb->msi_bmp.irq_count;
125 }
126 EXPORT_SYMBOL(pnv_cxl_get_irq_count);
127 
pnv_cxl_ioda_msi_setup(struct pci_dev * dev,unsigned int hwirq,unsigned int virq)128 int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
129 			   unsigned int virq)
130 {
131 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
132 	struct pnv_phb *phb = hose->private_data;
133 	unsigned int xive_num = hwirq - phb->msi_base;
134 	struct pnv_ioda_pe *pe;
135 	int rc;
136 
137 	if (!(pe = pnv_ioda_get_pe(dev)))
138 		return -ENODEV;
139 
140 	/* Assign XIVE to PE */
141 	rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
142 	if (rc) {
143 		pe_warn(pe, "%s: OPAL error %d setting msi_base 0x%x "
144 			"hwirq 0x%x XIVE 0x%x PE\n",
145 			pci_name(dev), rc, phb->msi_base, hwirq, xive_num);
146 		return -EIO;
147 	}
148 	pnv_set_msi_irq_chip(phb, virq);
149 
150 	return 0;
151 }
152 EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
153