git: c118e4da1296 - main - pci: Add `pci_find_base_class_from()`

The branch main has been updated by dumbbell:

URL: https://cgit.FreeBSD.org/src/commit/?id=c118e4da12969b98f52b3b6f35857c32541d7fa5

commit c118e4da12969b98f52b3b6f35857c32541d7fa5
Author:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
AuthorDate: 2024-12-22 16:23:34 +0000
Commit:     Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
CommitDate: 2025-01-31 16:00:47 +0000

    pci: Add `pci_find_base_class_from()`
    
    [Why]
    linuxkpi needs to export `pci_get_base_class()` for DRM drivers from
    Linux 6.7.
    
    [How]
    This new function searches a PCI device with the given base class and
    returns it, regardless of its subclass.
    
    The behavior is the same as `pci_find_class_from()` but the subclass is
    ignored.
    
    Reviewed by:    manu
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D48745
---
 sys/dev/pci/pci.c    | 21 +++++++++++++++++++++
 sys/dev/pci/pcivar.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index 30a95298a114..edebb718ec53 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -523,6 +523,27 @@ pci_find_class_from(uint8_t class, uint8_t subclass, device_t from)
 	return (NULL);
 }
 
+device_t
+pci_find_base_class_from(uint8_t class, device_t from)
+{
+	struct pci_devinfo *dinfo;
+	bool found = false;
+
+	STAILQ_FOREACH(dinfo, &pci_devq, pci_links) {
+		if (from != NULL && found == false) {
+			if (from != dinfo->cfg.dev)
+				continue;
+			found = true;
+			continue;
+		}
+		if (dinfo->cfg.baseclass == class) {
+			return (dinfo->cfg.dev);
+		}
+	}
+
+	return (NULL);
+}
+
 static int
 pci_printf(pcicfgregs *cfg, const char *fmt, ...)
 {
diff --git a/sys/dev/pci/pcivar.h b/sys/dev/pci/pcivar.h
index c2c1f055def9..1c7b772afea9 100644
--- a/sys/dev/pci/pcivar.h
+++ b/sys/dev/pci/pcivar.h
@@ -670,6 +670,7 @@ device_t pci_find_dbsf(uint32_t, uint8_t, uint8_t, uint8_t);
 device_t pci_find_device(uint16_t, uint16_t);
 device_t pci_find_class(uint8_t class, uint8_t subclass);
 device_t pci_find_class_from(uint8_t class, uint8_t subclass, device_t devfrom);
+device_t pci_find_base_class_from(uint8_t class, device_t devfrom);
 
 /* Can be used by drivers to manage the MSI-X table. */
 int	pci_pending_msix(device_t dev, u_int index);