PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 242 insertions, 0 deletions

diff --git a/drivers/scsi/sim710.c b/drivers/scsi/sim710.c
new file mode 100644
index 000000000..408f37003
--- /dev/null
+++ b/drivers/scsi/sim710.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * sim710.c - Copyright (C) 1999 Richard Hirst <richard@sleepie.demon.co.uk>
+ *
+ *----------------------------------------------------------------------------
+ *----------------------------------------------------------------------------
+ *
+ * MCA card detection code by Trent McNair. (now deleted)
+ * Fixes to not explicitly nul bss data from Xavier Bestel.
+ * Some multiboard fixes from Rolf Eike Beer.
+ * Auto probing of EISA config space from Trevor Hemsley.
+ *
+ * Rewritten to use 53c700.c by James.Bottomley@SteelEye.com
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/eisa.h>
+#include <linux/interrupt.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_spi.h>
+
+#include "53c700.h"
+
+
+/* Must be enough for EISA */
+#define MAX_SLOTS 8
+static __u8 __initdata id_array[MAX_SLOTS] = { [0 ... MAX_SLOTS-1] = 7 };
+
+static char *sim710;		/* command line passed by insmod */
+
+MODULE_AUTHOR("Richard Hirst");
+MODULE_DESCRIPTION("Simple NCR53C710 driver");
+MODULE_LICENSE("GPL");
+
+module_param(sim710, charp, 0);
+
+#ifdef MODULE
+#define ARG_SEP ' '
+#else
+#define ARG_SEP ','
+#endif
+
+static __init int
+param_setup(char *str)
+{
+	char *pos = str, *next;
+	int slot = -1;
+
+	while(pos != NULL && (next = strchr(pos, ':')) != NULL) {
+		int val = (int)simple_strtoul(++next, NULL, 0);
+
+		if(!strncmp(pos, "slot:", 5))
+			slot = val;
+		else if(!strncmp(pos, "id:", 3)) {
+			if(slot == -1) {
+				printk(KERN_WARNING "sim710: Must specify slot for id parameter\n");
+			} else if(slot >= MAX_SLOTS) {
+				printk(KERN_WARNING "sim710: Illegal slot %d for id %d\n", slot, val);
+			} else {
+				id_array[slot] = val;
+			}
+		}
+		if((pos = strchr(pos, ARG_SEP)) != NULL)
+			pos++;
+	}
+	return 1;
+}
+__setup("sim710=", param_setup);
+
+static struct scsi_host_template sim710_driver_template = {
+	.name			= "LSI (Symbios) 710 EISA",
+	.proc_name		= "sim710",
+	.this_id		= 7,
+	.module			= THIS_MODULE,
+};
+
+static int sim710_probe_common(struct device *dev, unsigned long base_addr,
+			       int irq, int clock, int differential,
+			       int scsi_id)
+{
+	struct Scsi_Host * host = NULL;
+	struct NCR_700_Host_Parameters *hostdata =
+		kzalloc_obj(struct NCR_700_Host_Parameters);
+
+	printk(KERN_NOTICE "sim710: %s\n", dev_name(dev));
+	printk(KERN_NOTICE "sim710: irq = %d, clock = %d, base = 0x%lx, scsi_id = %d\n",
+	       irq, clock, base_addr, scsi_id);
+
+	if(hostdata == NULL) {
+		printk(KERN_ERR "sim710: Failed to allocate host data\n");
+		goto out;
+	}
+
+	if(request_region(base_addr, 64, "sim710") == NULL) {
+		printk(KERN_ERR "sim710: Failed to reserve IO region 0x%lx\n",
+		       base_addr);
+		goto out_free;
+	}
+
+	/* Fill in the three required pieces of hostdata */
+	hostdata->base = ioport_map(base_addr, 64);
+	hostdata->differential = differential;
+	hostdata->clock = clock;
+	hostdata->chip710 = 1;
+	hostdata->burst_length = 8;
+
+	/* and register the chip */
+	if((host = NCR_700_detect(&sim710_driver_template, hostdata, dev))
+	   == NULL) {
+		printk(KERN_ERR "sim710: No host detected; card configuration problem?\n");
+		goto out_release;
+	}
+	host->this_id = scsi_id;
+	host->base = base_addr;
+	host->irq = irq;
+	if (request_irq(irq, NCR_700_intr, IRQF_SHARED, "sim710", host)) {
+		printk(KERN_ERR "sim710: request_irq failed\n");
+		goto out_put_host;
+	}
+
+	dev_set_drvdata(dev, host);
+	scsi_scan_host(host);
+
+	return 0;
+
+ out_put_host:
+	scsi_host_put(host);
+ out_release:
+	ioport_unmap(hostdata->base);
+	release_region(base_addr, 64);
+ out_free:
+	kfree(hostdata);
+ out:
+	return -ENODEV;
+}
+
+static int sim710_device_remove(struct device *dev)
+{
+	struct Scsi_Host *host = dev_get_drvdata(dev);
+	struct NCR_700_Host_Parameters *hostdata =
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	scsi_remove_host(host);
+	NCR_700_release(host);
+	ioport_unmap(hostdata->base);
+	kfree(hostdata);
+	free_irq(host->irq, host);
+	release_region(host->base, 64);
+	return 0;
+}
+
+#ifdef CONFIG_EISA
+static struct eisa_device_id sim710_eisa_ids[] = {
+	{ "CPQ4410" },
+	{ "CPQ4411" },
+	{ "HWP0C80" },
+	{ "" }
+};
+MODULE_DEVICE_TABLE(eisa, sim710_eisa_ids);
+
+static int sim710_eisa_probe(struct device *dev)
+{
+	struct eisa_device *edev = to_eisa_device(dev);
+	unsigned long io_addr = edev->base_addr;
+	char eisa_cpq_irqs[] = { 11, 14, 15, 10, 9, 0 };
+	char eisa_hwp_irqs[] = { 3, 4, 5, 7, 12, 10, 11, 0};
+	char *eisa_irqs;
+	unsigned char irq_index;
+	unsigned char irq, differential = 0, scsi_id = 7;
+
+	if(strcmp(edev->id.sig, "HWP0C80") == 0) {
+		__u8 val;
+		eisa_irqs =  eisa_hwp_irqs;
+		irq_index = (inb(io_addr + 0xc85) & 0x7) - 1;
+
+		val = inb(io_addr + 0x4);
+		scsi_id = ffs(val) - 1;
+
+		if(scsi_id > 7 || (val & ~(1<<scsi_id)) != 0) {
+			printk(KERN_ERR "sim710.c, EISA card %s has incorrect scsi_id, setting to 7\n", dev_name(dev));
+			scsi_id = 7;
+		}
+	} else {
+		eisa_irqs = eisa_cpq_irqs;
+		irq_index = inb(io_addr + 0xc88) & 0x07;
+	}
+
+	if(irq_index >= strlen(eisa_irqs)) {
+		printk("sim710.c: irq nasty\n");
+		return -ENODEV;
+	}
+
+	irq = eisa_irqs[irq_index];
+		
+	return sim710_probe_common(dev, io_addr, irq, 50,
+				   differential, scsi_id);
+}
+
+static struct eisa_driver sim710_eisa_driver = {
+	.id_table		= sim710_eisa_ids,
+	.driver = {
+		.name		= "sim710",
+		.probe		= sim710_eisa_probe,
+		.remove		= sim710_device_remove,
+	},
+};
+#endif /* CONFIG_EISA */
+
+static int __init sim710_init(void)
+{
+#ifdef MODULE
+	if (sim710)
+		param_setup(sim710);
+#endif
+
+#ifdef CONFIG_EISA
+	/*
+	 * FIXME: We'd really like to return -ENODEV if no devices have actually
+	 * been found.  However eisa_driver_register() only reports problems
+	 * with kobject_register() so simply return success for now.
+	 */
+	eisa_driver_register(&sim710_eisa_driver);
+#endif
+	return 0;
+}
+
+static void __exit sim710_exit(void)
+{
+#ifdef CONFIG_EISA
+	eisa_driver_unregister(&sim710_eisa_driver);
+#endif
+}
+
+module_init(sim710_init);
+module_exit(sim710_exit);