git: 254e4e5b77d7 - main - Simplify swi for bus_dma.
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Date: Tue, 28 Dec 2021 21:53:07 UTC
The branch main has been updated by jhb:
URL: https://cgit.FreeBSD.org/src/commit/?id=254e4e5b77d7788c46333ae35d5e9f347e22c746
commit 254e4e5b77d7788c46333ae35d5e9f347e22c746
Author: John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2021-12-28 21:51:25 +0000
Commit: John Baldwin <jhb@FreeBSD.org>
CommitDate: 2021-12-28 21:51:25 +0000
Simplify swi for bus_dma.
When a DMA request using bounce pages completes, a swi is triggered to
schedule pending DMA requests using the just-freed bounce pages. For
a long time this bus_dma swi has been tied to a "virtual memory" swi
(swi_vm). However, all of the swi_vm implementations are the same and
consist of checking a flag (busdma_swi_pending) which is always true
and if set calling busdma_swi. I suspect this dates back to the
pre-SMPng days and that the intention was for swi_vm to serve as a
mux. However, in the current scheme there's no need for the mux.
Instead, remove swi_vm and vm_ih. Each bus_dma implementation that
uses bounce pages is responsible for creating its own swi (busdma_ih)
which it now schedules directly. This swi invokes busdma_swi directly
removing the need for busdma_swi_pending.
One consequence is that the swi now works on RISC-V which had previously
failed to invoke busdma_swi from swi_vm.
Reviewed by: imp, kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D33447
---
sys/amd64/amd64/vm_machdep.c | 10 ----------
sys/amd64/include/cpu.h | 1 -
sys/arm/arm/busdma_machdep.c | 24 ++++++++++++++++++------
sys/arm/arm/vm_machdep.c | 11 -----------
sys/arm/include/cpu.h | 1 -
sys/arm/include/md_var.h | 2 --
sys/arm64/arm64/busdma_bounce.c | 24 ++++++++++++++++++------
sys/arm64/arm64/vm_machdep.c | 8 --------
sys/arm64/include/cpu.h | 1 -
sys/arm64/include/md_var.h | 2 --
sys/i386/i386/vm_machdep.c | 10 ----------
sys/i386/include/cpu.h | 1 -
sys/kern/kern_intr.c | 3 ---
sys/mips/include/cpu.h | 1 -
sys/mips/include/md_var.h | 3 ---
sys/mips/mips/busdma_machdep.c | 24 ++++++++++++++++++------
sys/mips/mips/vm_machdep.c | 11 -----------
sys/powerpc/include/cpu.h | 1 -
sys/powerpc/include/md_var.h | 2 --
sys/powerpc/powerpc/busdma_machdep.c | 24 ++++++++++++++++++------
sys/powerpc/powerpc/vm_machdep.c | 11 -----------
sys/riscv/include/cpu.h | 1 -
sys/riscv/include/md_var.h | 1 -
sys/riscv/riscv/busdma_bounce.c | 24 ++++++++++++++++++------
sys/riscv/riscv/vm_machdep.c | 7 -------
sys/sys/interrupt.h | 2 +-
sys/x86/include/x86_var.h | 2 --
sys/x86/x86/busdma_bounce.c | 24 ++++++++++++++++++------
28 files changed, 109 insertions(+), 127 deletions(-)
diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
index c0456c1d958c..232e53c63952 100644
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -691,16 +691,6 @@ cpu_set_user_tls(struct thread *td, void *tls_base)
return (0);
}
-/*
- * Software interrupt handler for queued VM system processing.
- */
-void
-swi_vm(void *dummy)
-{
- if (busdma_swi_pending != 0)
- busdma_swi();
-}
-
/*
* Tell whether this address is in some physical memory region.
* Currently used by the kernel coredump code in order to avoid
diff --git a/sys/amd64/include/cpu.h b/sys/amd64/include/cpu.h
index 1b8a552d3e7c..f7732435fc39 100644
--- a/sys/amd64/include/cpu.h
+++ b/sys/amd64/include/cpu.h
@@ -80,7 +80,6 @@ void cpu_halt(void);
void cpu_lock_delay(void);
void cpu_reset(void);
void fork_trampoline(void);
-void swi_vm(void *);
/*
* Return contents of in-cpu fast counter as a sort of "bogo-time"
diff --git a/sys/arm/arm/busdma_machdep.c b/sys/arm/arm/busdma_machdep.c
index caa9ae43834e..11c306526e0d 100644
--- a/sys/arm/arm/busdma_machdep.c
+++ b/sys/arm/arm/busdma_machdep.c
@@ -114,8 +114,6 @@ struct sync_list {
bus_size_t datacount; /* client data count */
};
-int busdma_swi_pending;
-
struct bounce_zone {
STAILQ_ENTRY(bounce_zone) links;
STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
@@ -151,6 +149,7 @@ static counter_u64_t maploads_physmem;
#endif
static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Busdma parameters");
@@ -1714,6 +1713,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
{
struct bus_dmamap *map;
struct bounce_zone *bz;
+ bool schedule_swi;
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
@@ -1728,6 +1728,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->busaddr &= ~PAGE_MASK;
}
+ schedule_swi = false;
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
bz->free_bpages++;
@@ -1737,16 +1738,17 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
map, links);
- busdma_swi_pending = 1;
bz->total_deferred++;
- swi_sched(vm_ih, 0);
+ schedule_swi = true;
}
}
mtx_unlock(&bounce_lock);
+ if (schedule_swi)
+ swi_sched(busdma_ih, 0);
}
-void
-busdma_swi(void)
+static void
+busdma_swi(void *dummy __unused)
{
bus_dma_tag_t dmat;
struct bus_dmamap *map;
@@ -1764,3 +1766,13 @@ busdma_swi(void)
}
mtx_unlock(&bounce_lock);
}
+
+static void
+start_busdma_swi(void *dummy __unused)
+{
+ if (swi_add(NULL, "busdma", busdma_swi, NULL, SWI_BUSDMA, INTR_MPSAFE,
+ &busdma_ih))
+ panic("died while creating busdma swi ithread");
+}
+SYSINIT(start_busdma_swi, SI_SUB_SOFTINTR, SI_ORDER_ANY, start_busdma_swi,
+ NULL);
diff --git a/sys/arm/arm/vm_machdep.c b/sys/arm/arm/vm_machdep.c
index ba44aa162e8b..5f21a92d2b8b 100644
--- a/sys/arm/arm/vm_machdep.c
+++ b/sys/arm/arm/vm_machdep.c
@@ -290,17 +290,6 @@ cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
td->td_pcb->pcb_regs.sf_r5 = (register_t)arg; /* first arg */
}
-/*
- * Software interrupt handler for queued VM system processing.
- */
-void
-swi_vm(void *dummy)
-{
-
- if (busdma_swi_pending)
- busdma_swi();
-}
-
void
cpu_exit(struct thread *td)
{
diff --git a/sys/arm/include/cpu.h b/sys/arm/include/cpu.h
index 8937a87aebea..14e19581b819 100644
--- a/sys/arm/include/cpu.h
+++ b/sys/arm/include/cpu.h
@@ -8,7 +8,6 @@
#include <machine/frame.h>
void cpu_halt(void);
-void swi_vm(void *);
#ifdef _KERNEL
#include <machine/cpu-v6.h>
diff --git a/sys/arm/include/md_var.h b/sys/arm/include/md_var.h
index 63f9f8256672..b41a24247951 100644
--- a/sys/arm/include/md_var.h
+++ b/sys/arm/include/md_var.h
@@ -53,8 +53,6 @@ extern enum cpu_class cpu_class;
struct dumperinfo;
struct minidumpstate;
-extern int busdma_swi_pending;
-void busdma_swi(void);
int cpu_minidumpsys(struct dumperinfo *, const struct minidumpstate *);
extern uint32_t initial_fpscr;
diff --git a/sys/arm64/arm64/busdma_bounce.c b/sys/arm64/arm64/busdma_bounce.c
index b2d00b9c0abd..ef2608d2dadc 100644
--- a/sys/arm64/arm64/busdma_bounce.c
+++ b/sys/arm64/arm64/busdma_bounce.c
@@ -90,8 +90,6 @@ struct bounce_page {
STAILQ_ENTRY(bounce_page) links;
};
-int busdma_swi_pending;
-
struct bounce_zone {
STAILQ_ENTRY(bounce_zone) links;
STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
@@ -114,6 +112,7 @@ static struct mtx bounce_lock;
static int total_bpages;
static int busdma_zonecount;
static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Busdma parameters");
@@ -1417,6 +1416,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
{
struct bus_dmamap *map;
struct bounce_zone *bz;
+ bool schedule_swi;
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
@@ -1431,6 +1431,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->busaddr &= ~PAGE_MASK;
}
+ schedule_swi = false;
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
bz->free_bpages++;
@@ -1440,16 +1441,17 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
map, links);
- busdma_swi_pending = 1;
bz->total_deferred++;
- swi_sched(vm_ih, 0);
+ schedule_swi = true;
}
}
mtx_unlock(&bounce_lock);
+ if (schedule_swi)
+ swi_sched(busdma_ih, 0);
}
-void
-busdma_swi(void)
+static void
+busdma_swi(void *dummy __unused)
{
bus_dma_tag_t dmat;
struct bus_dmamap *map;
@@ -1469,6 +1471,16 @@ busdma_swi(void)
mtx_unlock(&bounce_lock);
}
+static void
+start_busdma_swi(void *dummy __unused)
+{
+ if (swi_add(NULL, "busdma", busdma_swi, NULL, SWI_BUSDMA, INTR_MPSAFE,
+ &busdma_ih))
+ panic("died while creating busdma swi ithread");
+}
+SYSINIT(start_busdma_swi, SI_SUB_SOFTINTR, SI_ORDER_ANY, start_busdma_swi,
+ NULL);
+
struct bus_dma_impl bus_dma_bounce_impl = {
.tag_create = bounce_bus_dma_tag_create,
.tag_destroy = bounce_bus_dma_tag_destroy,
diff --git a/sys/arm64/arm64/vm_machdep.c b/sys/arm64/arm64/vm_machdep.c
index 2db20427c977..2b6a9dfebe82 100644
--- a/sys/arm64/arm64/vm_machdep.c
+++ b/sys/arm64/arm64/vm_machdep.c
@@ -304,11 +304,3 @@ cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
return (EINVAL);
}
-
-void
-swi_vm(void *v)
-{
-
- if (busdma_swi_pending != 0)
- busdma_swi();
-}
diff --git a/sys/arm64/include/cpu.h b/sys/arm64/include/cpu.h
index c926372a0ec6..b96767ddd2d5 100644
--- a/sys/arm64/include/cpu.h
+++ b/sys/arm64/include/cpu.h
@@ -170,7 +170,6 @@ void fork_trampoline(void);
void identify_cache(uint64_t);
void identify_cpu(u_int);
void install_cpu_errata(void);
-void swi_vm(void *v);
/* Functions to read the sanitised view of the special registers */
void update_special_regs(u_int);
diff --git a/sys/arm64/include/md_var.h b/sys/arm64/include/md_var.h
index 46a4737a6247..6c78317c830c 100644
--- a/sys/arm64/include/md_var.h
+++ b/sys/arm64/include/md_var.h
@@ -46,8 +46,6 @@ extern u_long elf32_hwcap2;
struct dumperinfo;
struct minidumpstate;
-extern int busdma_swi_pending;
-void busdma_swi(void);
int cpu_minidumpsys(struct dumperinfo *, const struct minidumpstate *);
void generic_bs_fault(void) __asm(__STRING(generic_bs_fault));
void generic_bs_peek_1(void) __asm(__STRING(generic_bs_peek_1));
diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c
index 5cdcdee96347..9dbcb9c909ce 100644
--- a/sys/i386/i386/vm_machdep.c
+++ b/sys/i386/i386/vm_machdep.c
@@ -651,16 +651,6 @@ sf_buf_invalidate_cache(vm_page_t m)
return (sf_buf_process_page(m, sf_buf_invalidate));
}
-/*
- * Software interrupt handler for queued VM system processing.
- */
-void
-swi_vm(void *dummy)
-{
- if (busdma_swi_pending != 0)
- busdma_swi();
-}
-
/*
* Tell whether this address is in some physical memory region.
* Currently used by the kernel coredump code in order to avoid
diff --git a/sys/i386/include/cpu.h b/sys/i386/include/cpu.h
index 8ba5e455f714..df35c9e92cc7 100644
--- a/sys/i386/include/cpu.h
+++ b/sys/i386/include/cpu.h
@@ -75,7 +75,6 @@ void cpu_halt(void);
void cpu_lock_delay(void);
void cpu_reset(void);
void fork_trampoline(void);
-void swi_vm(void *);
/*
* Return contents of in-cpu fast counter as a sort of "bogo-time"
diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
index 4e6e575a9fc9..3637b556af5d 100644
--- a/sys/kern/kern_intr.c
+++ b/sys/kern/kern_intr.c
@@ -90,7 +90,6 @@ struct intr_entropy {
struct intr_event *clk_intr_event;
struct intr_event *tty_intr_event;
-void *vm_ih;
struct proc *intrproc;
static MALLOC_DEFINE(M_ITHREAD, "ithread", "Interrupt Threads");
@@ -1639,8 +1638,6 @@ start_softintr(void *dummy)
if (swi_add(&clk_intr_event, "clk", NULL, NULL, SWI_CLOCK,
INTR_MPSAFE, NULL))
panic("died while creating clk swi ithread");
- if (swi_add(NULL, "vm", swi_vm, NULL, SWI_VM, INTR_MPSAFE, &vm_ih))
- panic("died while creating vm swi ithread");
}
SYSINIT(start_softintr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_softintr,
NULL);
diff --git a/sys/mips/include/cpu.h b/sys/mips/include/cpu.h
index b4f5c59f72f5..aaec97aa25f1 100644
--- a/sys/mips/include/cpu.h
+++ b/sys/mips/include/cpu.h
@@ -84,7 +84,6 @@
extern char btext[];
extern char etext[];
-void swi_vm(void *);
void cpu_halt(void);
void cpu_reset(void);
diff --git a/sys/mips/include/md_var.h b/sys/mips/include/md_var.h
index ca2afa9a3616..138047a13b47 100644
--- a/sys/mips/include/md_var.h
+++ b/sys/mips/include/md_var.h
@@ -78,9 +78,6 @@ void mips_postboot_fixup(void);
void cpu_identify(void);
void cpu_switch_set_userlocal(void) __asm(__STRING(cpu_switch_set_userlocal));
-extern int busdma_swi_pending;
-void busdma_swi(void);
-
struct dumperinfo;
struct minidumpstate;
int cpu_minidumpsys(struct dumperinfo *, const struct minidumpstate *);
diff --git a/sys/mips/mips/busdma_machdep.c b/sys/mips/mips/busdma_machdep.c
index 80e57cd0414f..f408ca8f4260 100644
--- a/sys/mips/mips/busdma_machdep.c
+++ b/sys/mips/mips/busdma_machdep.c
@@ -117,8 +117,6 @@ struct sync_list {
bus_size_t datacount; /* client data count */
};
-int busdma_swi_pending;
-
struct bounce_zone {
STAILQ_ENTRY(bounce_zone) links;
STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
@@ -141,6 +139,7 @@ static struct mtx bounce_lock;
static int total_bpages;
static int busdma_zonecount;
static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0,
"Busdma parameters");
@@ -1485,6 +1484,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
{
struct bus_dmamap *map;
struct bounce_zone *bz;
+ bool schedule_swi;
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
@@ -1499,6 +1499,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->busaddr &= ~PAGE_MASK;
}
+ schedule_swi = false;
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
bz->free_bpages++;
@@ -1508,16 +1509,17 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
map, links);
- busdma_swi_pending = 1;
bz->total_deferred++;
- swi_sched(vm_ih, 0);
+ schedule_swi = true;
}
}
mtx_unlock(&bounce_lock);
+ if (schedule_swi)
+ swi_sched(busdma_ih, 0);
}
-void
-busdma_swi(void)
+static void
+busdma_swi(void *dummy __unused)
{
bus_dma_tag_t dmat;
struct bus_dmamap *map;
@@ -1535,3 +1537,13 @@ busdma_swi(void)
}
mtx_unlock(&bounce_lock);
}
+
+static void
+start_busdma_swi(void *dummy __unused)
+{
+ if (swi_add(NULL, "busdma", busdma_swi, NULL, SWI_BUSDMA, INTR_MPSAFE,
+ &busdma_ih))
+ panic("died while creating busdma swi ithread");
+}
+SYSINIT(start_busdma_swi, SI_SUB_SOFTINTR, SI_ORDER_ANY, start_busdma_swi,
+ NULL);
diff --git a/sys/mips/mips/vm_machdep.c b/sys/mips/mips/vm_machdep.c
index a635bace4a09..eb313e2da8de 100644
--- a/sys/mips/mips/vm_machdep.c
+++ b/sys/mips/mips/vm_machdep.c
@@ -459,17 +459,6 @@ cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
return (EINVAL);
}
-/*
- * Software interrupt handler for queued VM system processing.
- */
-void
-swi_vm(void *dummy)
-{
-
- if (busdma_swi_pending)
- busdma_swi();
-}
-
int
cpu_set_user_tls(struct thread *td, void *tls_base)
{
diff --git a/sys/powerpc/include/cpu.h b/sys/powerpc/include/cpu.h
index 256e6d3eabf0..6eaa4a48a900 100644
--- a/sys/powerpc/include/cpu.h
+++ b/sys/powerpc/include/cpu.h
@@ -146,7 +146,6 @@ void cpu_halt(void);
void cpu_reset(void);
void flush_disable_caches(void);
void fork_trampoline(void);
-void swi_vm(void *);
int cpu_machine_check(struct thread *, struct trapframe *, int *);
diff --git a/sys/powerpc/include/md_var.h b/sys/powerpc/include/md_var.h
index 6e74000340b9..56c3639fe070 100644
--- a/sys/powerpc/include/md_var.h
+++ b/sys/powerpc/include/md_var.h
@@ -48,7 +48,6 @@ int cpu_minidumpsys(struct dumperinfo *, const struct minidumpstate *);
#endif
extern long Maxmem;
-extern int busdma_swi_pending;
extern vm_offset_t kstack0;
extern vm_offset_t kstack0_phys;
@@ -59,7 +58,6 @@ extern int hw_direct_map;
void __syncicache(void *, int);
-void busdma_swi(void);
int is_physical_memory(vm_offset_t addr);
int mem_valid(vm_offset_t addr, int len);
diff --git a/sys/powerpc/powerpc/busdma_machdep.c b/sys/powerpc/powerpc/busdma_machdep.c
index d513b7e65538..44d101613e0c 100644
--- a/sys/powerpc/powerpc/busdma_machdep.c
+++ b/sys/powerpc/powerpc/busdma_machdep.c
@@ -95,8 +95,6 @@ struct bounce_page {
STAILQ_ENTRY(bounce_page) links;
};
-int busdma_swi_pending;
-
struct bounce_zone {
STAILQ_ENTRY(bounce_zone) links;
STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
@@ -119,6 +117,7 @@ static struct mtx bounce_lock;
static int total_bpages;
static int busdma_zonecount;
static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Busdma parameters");
@@ -1178,6 +1177,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
{
struct bus_dmamap *map;
struct bounce_zone *bz;
+ bool schedule_swi;
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
@@ -1192,6 +1192,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->busaddr &= ~PAGE_MASK;
}
+ schedule_swi = false;
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
bz->free_bpages++;
@@ -1201,16 +1202,17 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
map, links);
- busdma_swi_pending = 1;
bz->total_deferred++;
- swi_sched(vm_ih, 0);
+ schedule_swi = true;
}
}
mtx_unlock(&bounce_lock);
+ if (schedule_swi)
+ swi_sched(busdma_ih, 0);
}
-void
-busdma_swi(void)
+static void
+busdma_swi(void *dummy __unused)
{
bus_dma_tag_t dmat;
struct bus_dmamap *map;
@@ -1230,6 +1232,16 @@ busdma_swi(void)
mtx_unlock(&bounce_lock);
}
+static void
+start_busdma_swi(void *dummy __unused)
+{
+ if (swi_add(NULL, "busdma", busdma_swi, NULL, SWI_BUSDMA, INTR_MPSAFE,
+ &busdma_ih))
+ panic("died while creating busdma swi ithread");
+}
+SYSINIT(start_busdma_swi, SI_SUB_SOFTINTR, SI_ORDER_ANY, start_busdma_swi,
+ NULL);
+
int
bus_dma_tag_set_iommu(bus_dma_tag_t tag, device_t iommu, void *cookie)
{
diff --git a/sys/powerpc/powerpc/vm_machdep.c b/sys/powerpc/powerpc/vm_machdep.c
index a7de9f0f6a1f..4a7347443407 100644
--- a/sys/powerpc/powerpc/vm_machdep.c
+++ b/sys/powerpc/powerpc/vm_machdep.c
@@ -208,17 +208,6 @@ cpu_exit(struct thread *td)
}
-/*
- * Software interrupt handler for queued VM system processing.
- */
-void
-swi_vm(void *dummy)
-{
-
- if (busdma_swi_pending != 0)
- busdma_swi();
-}
-
/*
* Tell whether this address is in some physical memory region.
* Currently used by the kernel coredump code in order to avoid
diff --git a/sys/riscv/include/cpu.h b/sys/riscv/include/cpu.h
index 453a6af1a0f8..ee7b1111af56 100644
--- a/sys/riscv/include/cpu.h
+++ b/sys/riscv/include/cpu.h
@@ -81,7 +81,6 @@ void cpu_halt(void) __dead2;
void cpu_reset(void) __dead2;
void fork_trampoline(void);
void identify_cpu(void);
-void swi_vm(void *v);
static __inline uint64_t
get_cyclecount(void)
diff --git a/sys/riscv/include/md_var.h b/sys/riscv/include/md_var.h
index 56007cd0c155..890f569782a3 100644
--- a/sys/riscv/include/md_var.h
+++ b/sys/riscv/include/md_var.h
@@ -44,7 +44,6 @@ extern register_t mimpid;
struct dumperinfo;
struct minidumpstate;
-void busdma_swi(void);
int cpu_minidumpsys(struct dumperinfo *, const struct minidumpstate *);
#endif /* !_MACHINE_MD_VAR_H_ */
diff --git a/sys/riscv/riscv/busdma_bounce.c b/sys/riscv/riscv/busdma_bounce.c
index 8ca803f13cd4..f6dde12fafbb 100644
--- a/sys/riscv/riscv/busdma_bounce.c
+++ b/sys/riscv/riscv/busdma_bounce.c
@@ -88,8 +88,6 @@ struct bounce_page {
STAILQ_ENTRY(bounce_page) links;
};
-int busdma_swi_pending;
-
struct bounce_zone {
STAILQ_ENTRY(bounce_zone) links;
STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
@@ -112,6 +110,7 @@ static struct mtx bounce_lock;
static int total_bpages;
static int busdma_zonecount;
static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Busdma parameters");
@@ -1260,6 +1259,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
{
struct bus_dmamap *map;
struct bounce_zone *bz;
+ bool schedule_swi;
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
@@ -1274,6 +1274,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->busaddr &= ~PAGE_MASK;
}
+ schedule_swi = false;
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
bz->free_bpages++;
@@ -1283,16 +1284,17 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
map, links);
- busdma_swi_pending = 1;
bz->total_deferred++;
- swi_sched(vm_ih, 0);
+ schedule_swi = true;
}
}
mtx_unlock(&bounce_lock);
+ if (schedule_swi)
+ swi_sched(busdma_ih, 0);
}
-void
-busdma_swi(void)
+static void
+busdma_swi(void *dummy __unused)
{
bus_dma_tag_t dmat;
struct bus_dmamap *map;
@@ -1312,6 +1314,16 @@ busdma_swi(void)
mtx_unlock(&bounce_lock);
}
+static void
+start_busdma_swi(void *dummy __unused)
+{
+ if (swi_add(NULL, "busdma", busdma_swi, NULL, SWI_BUSDMA, INTR_MPSAFE,
+ &busdma_ih))
+ panic("died while creating busdma swi ithread");
+}
+SYSINIT(start_busdma_swi, SI_SUB_SOFTINTR, SI_ORDER_ANY, start_busdma_swi,
+ NULL);
+
struct bus_dma_impl bus_dma_bounce_impl = {
.tag_create = bounce_bus_dma_tag_create,
.tag_destroy = bounce_bus_dma_tag_destroy,
diff --git a/sys/riscv/riscv/vm_machdep.c b/sys/riscv/riscv/vm_machdep.c
index 094662413f4e..84b7fec1516d 100644
--- a/sys/riscv/riscv/vm_machdep.c
+++ b/sys/riscv/riscv/vm_machdep.c
@@ -269,10 +269,3 @@ cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
return (EINVAL);
}
-
-void
-swi_vm(void *v)
-{
-
- /* Nothing to do here - busdma bounce buffers are not implemented. */
-}
diff --git a/sys/sys/interrupt.h b/sys/sys/interrupt.h
index 56952e45fe75..b333c5f74b65 100644
--- a/sys/sys/interrupt.h
+++ b/sys/sys/interrupt.h
@@ -144,7 +144,7 @@ struct intr_event {
#define SWI_TTY 0
#define SWI_NET 1
#define SWI_CAMBIO 2
-#define SWI_VM 3
+#define SWI_BUSDMA 3
#define SWI_CLOCK 4
#define SWI_TQ_FAST 5
#define SWI_TQ 6
diff --git a/sys/x86/include/x86_var.h b/sys/x86/include/x86_var.h
index 47b630d076d2..78acadd2b733 100644
--- a/sys/x86/include/x86_var.h
+++ b/sys/x86/include/x86_var.h
@@ -38,7 +38,6 @@
extern long Maxmem;
extern u_int basemem;
-extern int busdma_swi_pending;
extern u_int cpu_exthigh;
extern u_int cpu_feature;
extern u_int cpu_feature2;
@@ -115,7 +114,6 @@ typedef void alias_for_inthand_t(void);
bool acpi_get_fadt_bootflags(uint16_t *flagsp);
void *alloc_fpusave(int flags);
-void busdma_swi(void);
u_int cpu_auxmsr(void);
vm_paddr_t cpu_getmaxphyaddr(void);
bool cpu_mwait_usable(void);
diff --git a/sys/x86/x86/busdma_bounce.c b/sys/x86/x86/busdma_bounce.c
index ee6d2d50d542..7afa4cf6e2aa 100644
--- a/sys/x86/x86/busdma_bounce.c
+++ b/sys/x86/x86/busdma_bounce.c
@@ -90,8 +90,6 @@ struct bounce_page {
STAILQ_ENTRY(bounce_page) links;
};
-int busdma_swi_pending;
-
struct bounce_zone {
STAILQ_ENTRY(bounce_zone) links;
STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
@@ -115,6 +113,7 @@ static struct mtx bounce_lock;
static int total_bpages;
static int busdma_zonecount;
static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
+static void *busdma_ih;
static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"Busdma parameters");
@@ -1311,6 +1310,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
{
struct bus_dmamap *map;
struct bounce_zone *bz;
+ bool schedule_swi;
bz = dmat->bounce_zone;
bpage->datavaddr = 0;
@@ -1325,6 +1325,7 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
bpage->busaddr &= ~PAGE_MASK;
}
+ schedule_swi = false;
mtx_lock(&bounce_lock);
STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
bz->free_bpages++;
@@ -1334,16 +1335,17 @@ free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
map, links);
- busdma_swi_pending = 1;
bz->total_deferred++;
- swi_sched(vm_ih, 0);
+ schedule_swi = true;
}
}
mtx_unlock(&bounce_lock);
+ if (schedule_swi)
+ swi_sched(busdma_ih, 0);
}
-void
-busdma_swi(void)
+static void
+busdma_swi(void *dummy __unused)
{
bus_dma_tag_t dmat;
struct bus_dmamap *map;
@@ -1363,6 +1365,16 @@ busdma_swi(void)
mtx_unlock(&bounce_lock);
}
+static void
+start_busdma_swi(void *dummy __unused)
+{
+ if (swi_add(NULL, "busdma", busdma_swi, NULL, SWI_BUSDMA, INTR_MPSAFE,
+ &busdma_ih))
+ panic("died while creating busdma swi ithread");
+}
+SYSINIT(start_busdma_swi, SI_SUB_SOFTINTR, SI_ORDER_ANY, start_busdma_swi,
+ NULL);
+
struct bus_dma_impl bus_dma_bounce_impl = {
.tag_create = bounce_bus_dma_tag_create,
.tag_destroy = bounce_bus_dma_tag_destroy,