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xen: event channel arrays are xen_ulong_t and not unsigned long

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On ARM we want these to be the same size on 32- and 64-bit.

This is an ABI change on ARM. X86 does not change.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Keir (Xen.org) <keir@xen.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: xen-devel@lists.xen.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell 2013-02-20 11:48:06 +00:00 committed by Konrad Rzeszutek Wilk
parent 76eaca031f
commit c81611c4e9
4 changed files with 96 additions and 52 deletions
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22
arch/arm/include/asm/xen/events.h
View File

@ -15,4 +15,26 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->ARM_cpsr);
}
/*
* We cannot use xchg because it does not support 8-byte
* values. However it is safe to use {ldr,dtd}exd directly because all
* platforms which Xen can run on support those instructions.
*/
static inline xen_ulong_t xchg_xen_ulong(xen_ulong_t *ptr, xen_ulong_t val)
{
xen_ulong_t oldval;
unsigned int tmp;
wmb();
asm volatile("@ xchg_xen_ulong\n"
"1: ldrexd %0, %H0, [%3]\n"
" strexd %1, %2, %H2, [%3]\n"
" teq %1, #0\n"
" bne 1b"
: "=&r" (oldval), "=&r" (tmp)
: "r" (val), "r" (ptr)
: "memory", "cc");
return oldval;
}
#endif /* _ASM_ARM_XEN_EVENTS_H */

3
arch/x86/include/asm/xen/events.h
View File

@ -16,4 +16,7 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->flags);
}
/* No need for a barrier -- XCHG is a barrier on x86. */
#define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
#endif /* _ASM_X86_XEN_EVENTS_H */

115
drivers/xen/events.c
View File

@ -120,7 +120,22 @@ static unsigned long *pirq_eoi_map;
#endif
static bool (*pirq_needs_eoi)(unsigned irq);
static DEFINE_PER_CPU(unsigned long [NR_EVENT_CHANNELS/BITS_PER_LONG],
/*
* Note sizeof(xen_ulong_t) can be more than sizeof(unsigned long). Be
* careful to only use bitops which allow for this (e.g
* test_bit/find_first_bit and friends but not __ffs) and to pass
* BITS_PER_EVTCHN_WORD as the bitmask length.
*/
#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
/*
* Make a bitmask (i.e. unsigned long *) of a xen_ulong_t
* array. Primarily to avoid long lines (hence the terse name).
*/
#define BM(x) (unsigned long *)(x)
/* Find the first set bit in a evtchn mask */
#define EVTCHN_FIRST_BIT(w) find_first_bit(BM(&(w)), BITS_PER_EVTCHN_WORD)
static DEFINE_PER_CPU(xen_ulong_t [NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD],
cpu_evtchn_mask);
/* Xen will never allocate port zero for any purpose. */
@ -294,9 +309,9 @@ static bool pirq_needs_eoi_flag(unsigned irq)
return info->u.pirq.flags & PIRQ_NEEDS_EOI;
}
static inline unsigned long active_evtchns(unsigned int cpu,
struct shared_info *sh,
unsigned int idx)
static inline xen_ulong_t active_evtchns(unsigned int cpu,
struct shared_info *sh,
unsigned int idx)
{
return sh->evtchn_pending[idx] &
per_cpu(cpu_evtchn_mask, cpu)[idx] &
@ -312,8 +327,8 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
cpumask_copy(irq_to_desc(irq)->irq_data.affinity, cpumask_of(cpu));
#endif
clear_bit(chn, per_cpu(cpu_evtchn_mask, cpu_from_irq(irq)));
set_bit(chn, per_cpu(cpu_evtchn_mask, cpu));
clear_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu_from_irq(irq))));
set_bit(chn, BM(per_cpu(cpu_evtchn_mask, cpu)));
info_for_irq(irq)->cpu = cpu;
}
@ -339,19 +354,19 @@ static void init_evtchn_cpu_bindings(void)
static inline void clear_evtchn(int port)
{
struct shared_info *s = HYPERVISOR_shared_info;
sync_clear_bit(port, &s->evtchn_pending[0]);
sync_clear_bit(port, BM(&s->evtchn_pending[0]));
}
static inline void set_evtchn(int port)
{
struct shared_info *s = HYPERVISOR_shared_info;
sync_set_bit(port, &s->evtchn_pending[0]);
sync_set_bit(port, BM(&s->evtchn_pending[0]));
}
static inline int test_evtchn(int port)
{
struct shared_info *s = HYPERVISOR_shared_info;
return sync_test_bit(port, &s->evtchn_pending[0]);
return sync_test_bit(port, BM(&s->evtchn_pending[0]));
}
@ -375,7 +390,7 @@ EXPORT_SYMBOL_GPL(notify_remote_via_irq);
static void mask_evtchn(int port)
{
struct shared_info *s = HYPERVISOR_shared_info;
sync_set_bit(port, &s->evtchn_mask[0]);
sync_set_bit(port, BM(&s->evtchn_mask[0]));
}
static void unmask_evtchn(int port)
@ -389,7 +404,7 @@ static void unmask_evtchn(int port)
if (unlikely((cpu != cpu_from_evtchn(port))))
do_hypercall = 1;
else
evtchn_pending = sync_test_bit(port, &s->evtchn_pending[0]);
evtchn_pending = sync_test_bit(port, BM(&s->evtchn_pending[0]));
if (unlikely(evtchn_pending && xen_hvm_domain()))
do_hypercall = 1;
@ -403,7 +418,7 @@ static void unmask_evtchn(int port)
} else {
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
sync_clear_bit(port, &s->evtchn_mask[0]);
sync_clear_bit(port, BM(&s->evtchn_mask[0]));
/*
* The following is basically the equivalent of
@ -411,8 +426,8 @@ static void unmask_evtchn(int port)
* the interrupt edge' if the channel is masked.
*/
if (evtchn_pending &&
!sync_test_and_set_bit(port / BITS_PER_LONG,
&vcpu_info->evtchn_pending_sel))
!sync_test_and_set_bit(port / BITS_PER_EVTCHN_WORD,
BM(&vcpu_info->evtchn_pending_sel)))
vcpu_info->evtchn_upcall_pending = 1;
}
@ -1189,7 +1204,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
{
struct shared_info *sh = HYPERVISOR_shared_info;
int cpu = smp_processor_id();
unsigned long *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
xen_ulong_t *cpu_evtchn = per_cpu(cpu_evtchn_mask, cpu);
int i;
unsigned long flags;
static DEFINE_SPINLOCK(debug_lock);
@ -1205,7 +1220,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
pending = (get_irq_regs() && i == cpu)
? xen_irqs_disabled(get_irq_regs())
: v->evtchn_upcall_mask;
printk("%d: masked=%d pending=%d event_sel %0*lx\n ", i,
printk("%d: masked=%d pending=%d event_sel %0*"PRI_xen_ulong"\n ", i,
pending, v->evtchn_upcall_pending,
(int)(sizeof(v->evtchn_pending_sel)*2),
v->evtchn_pending_sel);
@ -1214,49 +1229,52 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
printk("\npending:\n ");
for (i = ARRAY_SIZE(sh->evtchn_pending)-1; i >= 0; i--)
printk("%0*lx%s", (int)sizeof(sh->evtchn_pending[0])*2,
printk("%0*"PRI_xen_ulong"%s",
(int)sizeof(sh->evtchn_pending[0])*2,
sh->evtchn_pending[i],
i % 8 == 0 ? "\n " : " ");
printk("\nglobal mask:\n ");
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
printk("%0*lx%s",
printk("%0*"PRI_xen_ulong"%s",
(int)(sizeof(sh->evtchn_mask[0])*2),
sh->evtchn_mask[i],
i % 8 == 0 ? "\n " : " ");
printk("\nglobally unmasked:\n ");
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--)
printk("%0*lx%s", (int)(sizeof(sh->evtchn_mask[0])*2),
printk("%0*"PRI_xen_ulong"%s",
(int)(sizeof(sh->evtchn_mask[0])*2),
sh->evtchn_pending[i] & ~sh->evtchn_mask[i],
i % 8 == 0 ? "\n " : " ");
printk("\nlocal cpu%d mask:\n ", cpu);
for (i = (NR_EVENT_CHANNELS/BITS_PER_LONG)-1; i >= 0; i--)
printk("%0*lx%s", (int)(sizeof(cpu_evtchn[0])*2),
for (i = (NR_EVENT_CHANNELS/BITS_PER_EVTCHN_WORD)-1; i >= 0; i--)
printk("%0*"PRI_xen_ulong"%s", (int)(sizeof(cpu_evtchn[0])*2),
cpu_evtchn[i],
i % 8 == 0 ? "\n " : " ");
printk("\nlocally unmasked:\n ");
for (i = ARRAY_SIZE(sh->evtchn_mask)-1; i >= 0; i--) {
unsigned long pending = sh->evtchn_pending[i]
xen_ulong_t pending = sh->evtchn_pending[i]
& ~sh->evtchn_mask[i]
& cpu_evtchn[i];
printk("%0*lx%s", (int)(sizeof(sh->evtchn_mask[0])*2),
printk("%0*"PRI_xen_ulong"%s",
(int)(sizeof(sh->evtchn_mask[0])*2),
pending, i % 8 == 0 ? "\n " : " ");
}
printk("\npending list:\n");
for (i = 0; i < NR_EVENT_CHANNELS; i++) {
if (sync_test_bit(i, sh->evtchn_pending)) {
int word_idx = i / BITS_PER_LONG;
if (sync_test_bit(i, BM(sh->evtchn_pending))) {
int word_idx = i / BITS_PER_EVTCHN_WORD;
printk(" %d: event %d -> irq %d%s%s%s\n",
cpu_from_evtchn(i), i,
evtchn_to_irq[i],
sync_test_bit(word_idx, &v->evtchn_pending_sel)
sync_test_bit(word_idx, BM(&v->evtchn_pending_sel))
? "" : " l2-clear",
!sync_test_bit(i, sh->evtchn_mask)
!sync_test_bit(i, BM(sh->evtchn_mask))
? "" : " globally-masked",
sync_test_bit(i, cpu_evtchn)
sync_test_bit(i, BM(cpu_evtchn))
? "" : " locally-masked");
}
}
@ -1273,7 +1291,7 @@ static DEFINE_PER_CPU(unsigned int, current_bit_idx);
/*
* Mask out the i least significant bits of w
*/
#define MASK_LSBS(w, i) (w & ((~0UL) << i))
#define MASK_LSBS(w, i) (w & ((~((xen_ulong_t)0UL)) << i))
/*
* Search the CPUs pending events bitmasks. For each one found, map
@ -1295,18 +1313,19 @@ static void __xen_evtchn_do_upcall(void)
unsigned count;
do {
unsigned long pending_words;
xen_ulong_t pending_words;
vcpu_info->evtchn_upcall_pending = 0;
if (__this_cpu_inc_return(xed_nesting_count) - 1)
goto out;
#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
/* Clear master flag /before/ clearing selector flag. */
wmb();
#endif
pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0);
/*
* Master flag must be cleared /before/ clearing
* selector flag. xchg_xen_ulong must contain an
* appropriate barrier.
*/
pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
start_word_idx = __this_cpu_read(current_word_idx);
start_bit_idx = __this_cpu_read(current_bit_idx);
@ -1314,8 +1333,8 @@ static void __xen_evtchn_do_upcall(void)
word_idx = start_word_idx;
for (i = 0; pending_words != 0; i++) {
unsigned long pending_bits;
unsigned long words;
xen_ulong_t pending_bits;
xen_ulong_t words;
words = MASK_LSBS(pending_words, word_idx);
@ -1327,7 +1346,7 @@ static void __xen_evtchn_do_upcall(void)
bit_idx = 0;
continue;
}
word_idx = __ffs(words);
word_idx = EVTCHN_FIRST_BIT(words);
pending_bits = active_evtchns(cpu, s, word_idx);
bit_idx = 0; /* usually scan entire word from start */
@ -1342,7 +1361,7 @@ static void __xen_evtchn_do_upcall(void)
}
do {
unsigned long bits;
xen_ulong_t bits;
int port, irq;
struct irq_desc *desc;
@ -1352,10 +1371,10 @@ static void __xen_evtchn_do_upcall(void)
if (bits == 0)
break;
bit_idx = __ffs(bits);
bit_idx = EVTCHN_FIRST_BIT(bits);
/* Process port. */
port = (word_idx * BITS_PER_LONG) + bit_idx;
port = (word_idx * BITS_PER_EVTCHN_WORD) + bit_idx;
irq = evtchn_to_irq[port];
if (irq != -1) {
@ -1364,12 +1383,12 @@ static void __xen_evtchn_do_upcall(void)
generic_handle_irq_desc(irq, desc);
}
bit_idx = (bit_idx + 1) % BITS_PER_LONG;
bit_idx = (bit_idx + 1) % BITS_PER_EVTCHN_WORD;
/* Next caller starts at last processed + 1 */
__this_cpu_write(current_word_idx,
bit_idx ? word_idx :
(word_idx+1) % BITS_PER_LONG);
(word_idx+1) % BITS_PER_EVTCHN_WORD);
__this_cpu_write(current_bit_idx, bit_idx);
} while (bit_idx != 0);
@ -1377,7 +1396,7 @@ static void __xen_evtchn_do_upcall(void)
if ((word_idx != start_word_idx) || (i != 0))
pending_words &= ~(1UL << word_idx);
word_idx = (word_idx + 1) % BITS_PER_LONG;
word_idx = (word_idx + 1) % BITS_PER_EVTCHN_WORD;
}
BUG_ON(!irqs_disabled());
@ -1487,8 +1506,8 @@ int resend_irq_on_evtchn(unsigned int irq)
if (!VALID_EVTCHN(evtchn))
return 1;
masked = sync_test_and_set_bit(evtchn, s->evtchn_mask);
sync_set_bit(evtchn, s->evtchn_pending);
masked = sync_test_and_set_bit(evtchn, BM(s->evtchn_mask));
sync_set_bit(evtchn, BM(s->evtchn_pending));
if (!masked)
unmask_evtchn(evtchn);
@ -1536,8 +1555,8 @@ static int retrigger_dynirq(struct irq_data *data)
if (VALID_EVTCHN(evtchn)) {
int masked;
masked = sync_test_and_set_bit(evtchn, sh->evtchn_mask);
sync_set_bit(evtchn, sh->evtchn_pending);
masked = sync_test_and_set_bit(evtchn, BM(sh->evtchn_mask));
sync_set_bit(evtchn, BM(sh->evtchn_pending));
if (!masked)
unmask_evtchn(evtchn);
ret = 1;

8
include/xen/interface/xen.h
View File

@ -285,7 +285,7 @@ DEFINE_GUEST_HANDLE_STRUCT(multicall_entry);
* Event channel endpoints per domain:
* 1024 if a long is 32 bits; 4096 if a long is 64 bits.
*/
#define NR_EVENT_CHANNELS (sizeof(unsigned long) * sizeof(unsigned long) * 64)
#define NR_EVENT_CHANNELS (sizeof(xen_ulong_t) * sizeof(xen_ulong_t) * 64)
struct vcpu_time_info {
/*
@ -341,7 +341,7 @@ struct vcpu_info {
*/
uint8_t evtchn_upcall_pending;
uint8_t evtchn_upcall_mask;
unsigned long evtchn_pending_sel;
xen_ulong_t evtchn_pending_sel;
struct arch_vcpu_info arch;
struct pvclock_vcpu_time_info time;
}; /* 64 bytes (x86) */
@ -384,8 +384,8 @@ struct shared_info {
* per-vcpu selector word to be set. Each bit in the selector covers a
* 'C long' in the PENDING bitfield array.
*/
unsigned long evtchn_pending[sizeof(unsigned long) * 8];
unsigned long evtchn_mask[sizeof(unsigned long) * 8];
xen_ulong_t evtchn_pending[sizeof(xen_ulong_t) * 8];
xen_ulong_t evtchn_mask[sizeof(xen_ulong_t) * 8];
/*
* Wallclock time: updated only by control software. Guests should base