1 // SPDX-License-Identifier: GPL-2.0-only
4  * Copyright 2006-2007 Michael Ellerman, IBM Corp.
9 #include <linux/msi.h>
13 #include <asm/ppc-pci.h>
35 	addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);  in rtas_change_msi()
36 	buid = pdn->phb->buid;  in rtas_change_msi()
60 		rc = -rc;  in rtas_change_msi()
77 	 * disabling MSI with the explicit interface also disables MSI-X  in rtas_disable_msi()
96 	addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);  in rtas_query_irq_number()
97 	buid = pdn->phb->buid;  in rtas_query_irq_number()
117 		if (!entry->irq)  in rtas_teardown_msi_irqs()
120 		irq_set_msi_desc(entry->irq, NULL);  in rtas_teardown_msi_irqs()
121 		irq_dispose_mapping(entry->irq);  in rtas_teardown_msi_irqs()
138 		return -ENOENT;  in check_req()
146 			return -ENOSPC;  in check_req()
156 	return check_req(pdev, nvec, "ibm,req#msi");  in check_req_msi()
161 	return check_req(pdev, nvec, "ibm,req#msi-x");  in check_req_msix()
173 		p = of_get_property(dn, "ibm,pe-total-#msi", NULL);  in find_pe_total_msi()
200 	if (edev->pe)  in find_pe_dn()
201 		edev = list_first_entry(&edev->pe->edevs, struct eeh_dev,  in find_pe_dn()
203 	dn = pci_device_to_OF_node(edev->pdev);  in find_pe_dn()
236 	p = of_get_property(dn, "class-code", NULL);  in count_non_bridge_devices()
240 		counts->num_devices++;  in count_non_bridge_devices()
251 	if (dn == counts->requestor)  in count_spare_msis()
252 		req = counts->request;  in count_spare_msis()
254 		/* We don't know if a driver will try to use MSI or MSI-X,  in count_spare_msis()
257 		p = of_get_property(dn, "ibm,req#msi", NULL);  in count_spare_msis()
261 		p = of_get_property(dn, "ibm,req#msi-x", NULL);  in count_spare_msis()
266 	if (req < counts->quota)  in count_spare_msis()
267 		counts->spare += counts->quota - req;  in count_spare_msis()
268 	else if (req > counts->quota)  in count_spare_msis()
269 		counts->over_quota++;  in count_spare_msis()
318 	/* Divide any spare by the number of over-quota requestors */  in msi_quota_for_device()
338 	 * a discontiguous, or non-zero based, range of MSI-X entries.  in check_msix_entries()
343 		if (entry->msi_attrib.entry_nr != expected) {  in check_msix_entries()
344 			pr_debug("rtas_msi: bad MSI-X entries.\n");  in check_msix_entries()
345 			return -EINVAL;  in check_msix_entries()
359 	 * fact that we using RTAS for MSIs, we don't have the 32 bit MSI RTAS  in rtas_hack_32bit_msi_gen2()
362 	dev_info(&pdev->dev,  in rtas_hack_32bit_msi_gen2()
363 		 "rtas_msi: No 32 bit MSI firmware support, forcing 32 bit MSI\n");  in rtas_hack_32bit_msi_gen2()
364 	pci_read_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, &addr_hi);  in rtas_hack_32bit_msi_gen2()
365 	addr_lo = 0xffff0000 | ((addr_hi >> (48 - 32)) << 4);  in rtas_hack_32bit_msi_gen2()
366 	pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_LO, addr_lo);  in rtas_hack_32bit_msi_gen2()
367 	pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, 0);  in rtas_hack_32bit_msi_gen2()
393 		return -EINVAL;  in rtas_setup_msi_irqs()
412 	 * return MSI-Xs.  in rtas_setup_msi_irqs()
416 		if (pdev->no_64bit_msi) {  in rtas_setup_msi_irqs()
420 				 * We only want to run the 32 bit MSI hack below if  in rtas_setup_msi_irqs()
423 				if (pdev->bus->max_bus_speed != PCIE_SPEED_5_0GT)  in rtas_setup_msi_irqs()
429 			rc = -1;  in rtas_setup_msi_irqs()
462 						   entry->affinity);  in rtas_setup_msi_irqs()
466 			return -ENOSPC;  in rtas_setup_msi_irqs()
469 		dev_dbg(&pdev->dev, "rtas_msi: allocated virq %d\n", virq);  in rtas_setup_msi_irqs()
474 		entry->msg = msg;  in rtas_setup_msi_irqs()
482 	/* No LSI -> leave MSIs (if any) configured */  in rtas_msi_pci_irq_fixup()
483 	if (!pdev->irq) {  in rtas_msi_pci_irq_fixup()
484 		dev_dbg(&pdev->dev, "rtas_msi: no LSI, nothing to do.\n");  in rtas_msi_pci_irq_fixup()
488 	/* No MSI -> MSIs can't have been assigned by fw, leave LSI */  in rtas_msi_pci_irq_fixup()
490 		dev_dbg(&pdev->dev, "rtas_msi: no req#msi/x, nothing to do.\n");  in rtas_msi_pci_irq_fixup()
494 	dev_dbg(&pdev->dev, "rtas_msi: disabling existing MSI.\n");  in rtas_msi_pci_irq_fixup()
502 	query_token  = rtas_token("ibm,query-interrupt-source-number");  in rtas_msi_init()
503 	change_token = rtas_token("ibm,change-msi");  in rtas_msi_init()
507 		pr_debug("rtas_msi: no RTAS tokens, no MSI support.\n");  in rtas_msi_init()
508 		return -1;  in rtas_msi_init()
511 	pr_debug("rtas_msi: Registering RTAS MSI callbacks.\n");  in rtas_msi_init()
518 		WARN_ON(phb->controller_ops.setup_msi_irqs);  in rtas_msi_init()
519 		phb->controller_ops.setup_msi_irqs = rtas_setup_msi_irqs;  in rtas_msi_init()
520 		phb->controller_ops.teardown_msi_irqs = rtas_teardown_msi_irqs;  in rtas_msi_init()