git: b563be66998d - main - dmar_qi_emit(): use atomic_store_64() when available

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=b563be66998ddd9dbc83364c8b515398d984c140

commit b563be66998ddd9dbc83364c8b515398d984c140
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2024-06-06 03:21:31 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2024-09-04 21:50:18 +0000

    dmar_qi_emit(): use atomic_store_64() when available
    
    Sponsored by:   Advanced Micro Devices (AMD)
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
---
 sys/x86/iommu/intel_qi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sys/x86/iommu/intel_qi.c b/sys/x86/iommu/intel_qi.c
index b474d695552f..8b5cfe3c0205 100644
--- a/sys/x86/iommu/intel_qi.c
+++ b/sys/x86/iommu/intel_qi.c
@@ -139,15 +139,25 @@ dmar_qi_emit(struct dmar_unit *unit, uint64_t data1, uint64_t data2)
 {
 
 	DMAR_ASSERT_LOCKED(unit);
+#ifdef __LP64__
+	atomic_store_64((uint64_t *)(unit->x86c.inv_queue +
+	    unit->x86c.inv_queue_tail), data1);
+#else
 	*(volatile uint64_t *)(unit->x86c.inv_queue +
 	    unit->x86c.inv_queue_tail) = data1;
+#endif
 	unit->x86c.inv_queue_tail += DMAR_IQ_DESCR_SZ / 2;
 	KASSERT(unit->x86c.inv_queue_tail <= unit->x86c.inv_queue_size,
 	    ("tail overflow 0x%x 0x%jx", unit->x86c.inv_queue_tail,
 	    (uintmax_t)unit->x86c.inv_queue_size));
 	unit->x86c.inv_queue_tail &= unit->x86c.inv_queue_size - 1;
+#ifdef __LP64__
+	atomic_store_64((uint64_t *)(unit->x86c.inv_queue +
+	    unit->x86c.inv_queue_tail), data2);
+#else
 	*(volatile uint64_t *)(unit->x86c.inv_queue +
 	    unit->x86c.inv_queue_tail) = data2;
+#endif
 	unit->x86c.inv_queue_tail += DMAR_IQ_DESCR_SZ / 2;
 	KASSERT(unit->x86c.inv_queue_tail <= unit->x86c.inv_queue_size,
 	    ("tail overflow 0x%x 0x%jx", unit->x86c.inv_queue_tail,