direct commit: fix KBI for pci_dev

Move all the new elemenets to the end of the structure for 13. We
allocate this inside the linuxkpi code, so the size isn't enccoded in
client modules. However, the offsets to the different fields are
encoded. Tihs modifies 04456f711853, 40a215e38a4d, and 3a606aadf2e7
and will likely create merge conflicts there (and that's a good thing
since the elements need to be moved to the end of the structure when
merging).

Tweak irq_ent to be binary compatible. Since this is inlined into the
clients, all clients have to agree on the irq_ent offsets.

Restore visibility to linux_kmem_cache_free_rcu
linux_kmem_cache_free_rcu was made static in 10235ad0567f, however
client drivers depended on calling it directly. Make it visible again to
restore the 13.0-Release KBI for linuxkpi.

Bump FreeBSD_version to 1300515 for restoration of 13.0 KBI. Since this
commmit changes the linuxkpi KBI (this time back to 13.0 release to
restore the status quo of), you'll need to recompile everything that
uses it (you needed to earlier as well, but those were silent
recompilation events). The plus side is that our packages (built using
13.0) for drm-kmod 5.4 work again on -stable systems.

Reviewed by:		bz, wulf
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D31363

5 files changed, 20 insertions, 12 deletions

diff --git a/sys/compat/linuxkpi/common/include/linux/interrupt.h b/sys/compat/linuxkpi/common/include/linux/interrupt.h
index 6770adad2293..066157f9b559 100644
--- a/sys/compat/linuxkpi/common/include/linux/interrupt.h
+++ b/sys/compat/linuxkpi/common/include/linux/interrupt.h
@@ -52,9 +52,11 @@ struct irq_ent {
 	struct resource	*res;
 	void		*arg;
 	irqreturn_t	(*handler)(int, void *);
-	irqreturn_t	(*thread_handler)(int, void *);
 	void		*tag;
 	unsigned int	irq;
+
+	/* XXX All new entries must be after this in stable/13 */
+	irqreturn_t	(*thread_handler)(int, void *);
 };
 
 void linux_irq_handler(void *);
diff --git a/sys/compat/linuxkpi/common/include/linux/pci.h b/sys/compat/linuxkpi/common/include/linux/pci.h
index 4784799d82b5..1ec7fe75388d 100644
--- a/sys/compat/linuxkpi/common/include/linux/pci.h
+++ b/sys/compat/linuxkpi/common/include/linux/pci.h
@@ -237,7 +237,6 @@ struct pci_dev {
 	struct list_head	links;
 	struct pci_driver	*pdrv;
 	struct pci_bus		*bus;
-	struct pci_dev		*root;
 	uint16_t		device;
 	uint16_t		vendor;
 	uint16_t		subsystem_vendor;
@@ -246,16 +245,21 @@ struct pci_dev {
 	unsigned int		devfn;
 	uint32_t		class;
 	uint8_t			revision;
-	bool			managed;	/* devres "pcim_*(). */
-	bool			want_iomap_res;
 	bool			msi_enabled;
-	bool			msix_enabled;
-	phys_addr_t		rom;
-	size_t			romlen;
 
 	TAILQ_HEAD(, pci_mmio_region)	mmio;
+
+	/* Add all new items at the end of the list in 13 */
+	struct pci_dev		*root;
+	phys_addr_t		rom;
+	size_t			romlen;
+	bool			managed;	/* devres "pcim_*(). */
+	bool			want_iomap_res;
+	bool			msix_enabled;
 };
 
+/* XXX add kassert here on the mmio offset */
+
 /* We need some meta-struct to keep track of these for devres. */
 struct pci_devres {
 	bool		enable_io;
diff --git a/sys/compat/linuxkpi/common/include/linux/slab.h b/sys/compat/linuxkpi/common/include/linux/slab.h
index ecd39d711eb4..23ba8b9c8ae7 100644
--- a/sys/compat/linuxkpi/common/include/linux/slab.h
+++ b/sys/compat/linuxkpi/common/include/linux/slab.h
@@ -210,5 +210,7 @@ extern void *lkpi_kmem_cache_zalloc(struct linux_kmem_cache *, gfp_t);
 extern void lkpi_kmem_cache_free(struct linux_kmem_cache *, void *);
 extern void linux_kmem_cache_destroy(struct linux_kmem_cache *);
 void linux_kfree_async(void *);
+void linux_kmem_cache_free_rcu_callback(struct rcu_head *head);
+void linux_kmem_cache_free_rcu(struct linux_kmem_cache *, void *);
 
 #endif					/* _LINUX_SLAB_H_ */
diff --git a/sys/compat/linuxkpi/common/src/linux_slab.c b/sys/compat/linuxkpi/common/src/linux_slab.c
index 5dbd87b66d1a..35a88fd7cf42 100644
--- a/sys/compat/linuxkpi/common/src/linux_slab.c
+++ b/sys/compat/linuxkpi/common/src/linux_slab.c
@@ -96,7 +96,7 @@ linux_kmem_ctor(void *mem, int size, void *arg, int flags)
 	return (0);
 }
 
-static void
+void
 linux_kmem_cache_free_rcu_callback(struct rcu_head *head)
 {
 	struct linux_kmem_rcu *rcu =
@@ -145,8 +145,8 @@ linux_kmem_cache_create(const char *name, size_t size, size_t align,
 	return (c);
 }
 
-static inline void
-lkpi_kmem_cache_free_rcu(struct linux_kmem_cache *c, void *m)
+void
+linux_kmem_cache_free_rcu(struct linux_kmem_cache *c, void *m)
 {
 	struct linux_kmem_rcu *rcu = LINUX_KMEM_TO_RCU(c, m);
 
@@ -183,7 +183,7 @@ void
 lkpi_kmem_cache_free(struct linux_kmem_cache *c, void *m)
 {
 	if (unlikely(c->cache_flags & SLAB_TYPESAFE_BY_RCU))
-		lkpi_kmem_cache_free_rcu(c, m);
+		linux_kmem_cache_free_rcu(c, m);
 	else if (unlikely(curthread->td_critnest != 0))
 		lkpi_kmem_cache_free_async(c, m);
 	else
diff --git a/sys/sys/param.h b/sys/sys/param.h
index ef5eb4206706..c1066baa59f2 100644
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -60,7 +60,7 @@
  *		in the range 5 to 9.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1300514	/* Master, propagated to newvers */
+#define __FreeBSD_version 1300515	/* Master, propagated to newvers */
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,