From ea4c01156a9244a084a4044bc77147adfd9167ce Mon Sep 17 00:00:00 2001
From: Ruslan Bukin <br@FreeBSD.org>
Date: Tue, 28 Jul 2020 16:08:14 +0000
Subject: o Move the buswide_ctxs bitmap to iommu_unit and rename related
 functions. o Rename bus_dma_dmar_load_ident() as well.

Reviewed by:	kib
Sponsored by:	DARPA/AFRL
Differential Revision:	https://reviews.freebsd.org/D25852
---
 sys/dev/iommu/busdma_iommu.c      |  8 ++++----
 sys/dev/iommu/iommu.h             | 12 +++++++++++-
 sys/dev/ntb/ntb_hw/ntb_hw_intel.c |  2 +-
 sys/dev/ntb/ntb_hw/ntb_hw_plx.c   |  2 +-
 4 files changed, 17 insertions(+), 7 deletions(-)

(limited to 'sys/dev')

diff --git a/sys/dev/iommu/busdma_iommu.c b/sys/dev/iommu/busdma_iommu.c
index a4fe8ee9d063..0fd54e8b641a 100644
--- a/sys/dev/iommu/busdma_iommu.c
+++ b/sys/dev/iommu/busdma_iommu.c
@@ -299,7 +299,7 @@ acpi_iommu_get_dma_tag(device_t dev, device_t child)
 }
 
 bool
-bus_dma_dmar_set_buswide(device_t dev)
+bus_dma_iommu_set_buswide(device_t dev)
 {
 	struct iommu_unit *unit;
 	device_t parent;
@@ -317,12 +317,12 @@ bus_dma_dmar_set_buswide(device_t dev)
 	if (slot != 0 || func != 0) {
 		if (bootverbose) {
 			device_printf(dev,
-			    "dmar%d pci%d:%d:%d requested buswide busdma\n",
+			    "iommu%d pci%d:%d:%d requested buswide busdma\n",
 			    unit->unit, busno, slot, func);
 		}
 		return (false);
 	}
-	dmar_set_buswide_ctx(unit, busno);
+	iommu_set_buswide_ctx(unit, busno);
 	return (true);
 }
 
@@ -987,7 +987,7 @@ iommu_fini_busdma(struct iommu_unit *unit)
 }
 
 int
-bus_dma_dmar_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map1,
+bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map1,
     vm_paddr_t start, vm_size_t length, int flags)
 {
 	struct bus_dma_tag_common *tc;
diff --git a/sys/dev/iommu/iommu.h b/sys/dev/iommu/iommu.h
index c3bc3d26b765..380f4cdfe5f6 100644
--- a/sys/dev/iommu/iommu.h
+++ b/sys/dev/iommu/iommu.h
@@ -34,11 +34,13 @@
 #ifndef _SYS_IOMMU_H_
 #define _SYS_IOMMU_H_
 
+#include <sys/types.h>
 #include <sys/queue.h>
 #include <sys/sysctl.h>
 #include <sys/taskqueue.h>
 #include <sys/tree.h>
-#include <sys/types.h>
+
+#include <dev/pci/pcireg.h>
 
 /* Host or physical memory address, after translation. */
 typedef uint64_t iommu_haddr_t;
@@ -96,6 +98,14 @@ struct iommu_unit {
 	struct task dmamap_load_task;
 	TAILQ_HEAD(, bus_dmamap_iommu) delayed_maps;
 	struct taskqueue *delayed_taskqueue;
+
+	/*
+	 * Bitmap of buses for which context must ignore slot:func,
+	 * duplicating the page table pointer into all context table
+	 * entries.  This is a client-controlled quirk to support some
+	 * NTBs.
+	 */
+	uint32_t buswide_ctxs[(PCI_BUSMAX + 1) / NBBY / sizeof(uint32_t)];
 };
 
 /*
diff --git a/sys/dev/ntb/ntb_hw/ntb_hw_intel.c b/sys/dev/ntb/ntb_hw/ntb_hw_intel.c
index 9182461fe9a5..ba61fdc9ffcd 100644
--- a/sys/dev/ntb/ntb_hw/ntb_hw_intel.c
+++ b/sys/dev/ntb/ntb_hw/ntb_hw_intel.c
@@ -811,7 +811,7 @@ intel_ntb_map_pci_bars(struct ntb_softc *ntb)
 		device_printf(ntb->device, "Unable to create BAR0 map\n");
 		return (ENOMEM);
 	}
-	if (bus_dma_dmar_load_ident(ntb->bar0_dma_tag, ntb->bar0_dma_map,
+	if (bus_dma_iommu_load_ident(ntb->bar0_dma_tag, ntb->bar0_dma_map,
 	    bar->pbase, bar->size, 0)) {
 		device_printf(ntb->device, "Unable to load BAR0 map\n");
 		return (ENOMEM);
diff --git a/sys/dev/ntb/ntb_hw/ntb_hw_plx.c b/sys/dev/ntb/ntb_hw/ntb_hw_plx.c
index 97df9ce3a4cc..a9654e7f6725 100644
--- a/sys/dev/ntb/ntb_hw/ntb_hw_plx.c
+++ b/sys/dev/ntb/ntb_hw/ntb_hw_plx.c
@@ -343,7 +343,7 @@ ntb_plx_attach(device_t dev)
 	 * The device occupies whole bus.  In translated TLP slot field
 	 * keeps LUT index (original bus/slot), function is passed through.
 	 */
-	bus_dma_dmar_set_buswide(dev);
+	bus_dma_iommu_set_buswide(dev);
 
 	/* Identify chip port we are connected to. */
 	val = bus_read_4(sc->conf_res, 0x360);
-- 
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