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Date: Tue, 9 Mar 2021 08:33:55 +0000
From: Max Gurtovoy <mgurtovoy@...dia.com>
To: <jgg@...dia.com>, <alex.williamson@...hat.com>,
<cohuck@...hat.com>, <kvm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: <liranl@...dia.com>, <oren@...dia.com>, <tzahio@...dia.com>,
<leonro@...dia.com>, <yarong@...dia.com>, <aviadye@...dia.com>,
<shahafs@...dia.com>, <artemp@...dia.com>, <kwankhede@...dia.com>,
<ACurrid@...dia.com>, <cjia@...dia.com>, <yishaih@...dia.com>,
<mjrosato@...ux.ibm.com>, <aik@...abs.ru>, <hch@....de>,
Max Gurtovoy <mgurtovoy@...dia.com>
Subject: [PATCH 7/9] vfio/pci_core: split nvlink2 to nvlink2gpu and npu2
This is a preparation for moving vendor specific code from
vfio_pci_core to vendor specific vfio_pci drivers. The next step will be
creating a dedicated module to NVIDIA NVLINK2 devices with P9 extensions
and a dedicated module for Power9 NPU NVLink2 HBAs.
Signed-off-by: Max Gurtovoy <mgurtovoy@...dia.com>
---
drivers/vfio/pci/Makefile | 2 +-
drivers/vfio/pci/npu2_trace.h | 50 ++++
.../vfio/pci/{trace.h => nvlink2gpu_trace.h} | 27 +--
drivers/vfio/pci/vfio_pci_core.c | 2 +-
drivers/vfio/pci/vfio_pci_core.h | 4 +-
drivers/vfio/pci/vfio_pci_npu2.c | 222 ++++++++++++++++++
...io_pci_nvlink2.c => vfio_pci_nvlink2gpu.c} | 201 +---------------
7 files changed, 280 insertions(+), 228 deletions(-)
create mode 100644 drivers/vfio/pci/npu2_trace.h
rename drivers/vfio/pci/{trace.h => nvlink2gpu_trace.h} (72%)
create mode 100644 drivers/vfio/pci/vfio_pci_npu2.c
rename drivers/vfio/pci/{vfio_pci_nvlink2.c => vfio_pci_nvlink2gpu.c} (59%)
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index 16e7d77d63ce..f539f32c9296 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -5,7 +5,7 @@ obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
vfio-pci-core-y := vfio_pci_core.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
vfio-pci-core-$(CONFIG_VFIO_PCI_IGD) += vfio_pci_igd.o
-vfio-pci-core-$(CONFIG_VFIO_PCI_NVLINK2) += vfio_pci_nvlink2.o
+vfio-pci-core-$(CONFIG_VFIO_PCI_NVLINK2) += vfio_pci_nvlink2gpu.o vfio_pci_npu2.o
vfio-pci-core-$(CONFIG_S390) += vfio_pci_zdev.o
vfio-pci-y := vfio_pci.o
diff --git a/drivers/vfio/pci/npu2_trace.h b/drivers/vfio/pci/npu2_trace.h
new file mode 100644
index 000000000000..c8a1110132dc
--- /dev/null
+++ b/drivers/vfio/pci/npu2_trace.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * VFIO PCI mmap/mmap_fault tracepoints
+ *
+ * Copyright (C) 2018 IBM Corp. All rights reserved.
+ * Author: Alexey Kardashevskiy <aik@...abs.ru>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM vfio_pci
+
+#if !defined(_TRACE_VFIO_PCI_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_VFIO_PCI_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(vfio_pci_npu2_mmap,
+ TP_PROTO(struct pci_dev *pdev, unsigned long hpa, unsigned long ua,
+ unsigned long size, int ret),
+ TP_ARGS(pdev, hpa, ua, size, ret),
+
+ TP_STRUCT__entry(
+ __field(const char *, name)
+ __field(unsigned long, hpa)
+ __field(unsigned long, ua)
+ __field(unsigned long, size)
+ __field(int, ret)
+ ),
+
+ TP_fast_assign(
+ __entry->name = dev_name(&pdev->dev),
+ __entry->hpa = hpa;
+ __entry->ua = ua;
+ __entry->size = size;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("%s: %lx -> %lx size=%lx ret=%d", __entry->name, __entry->hpa,
+ __entry->ua, __entry->size, __entry->ret)
+);
+
+#endif /* _TRACE_VFIO_PCI_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../drivers/vfio/pci
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE npu2_trace
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/drivers/vfio/pci/trace.h b/drivers/vfio/pci/nvlink2gpu_trace.h
similarity index 72%
rename from drivers/vfio/pci/trace.h
rename to drivers/vfio/pci/nvlink2gpu_trace.h
index b2aa986ab9ed..2392b9d4c6c9 100644
--- a/drivers/vfio/pci/trace.h
+++ b/drivers/vfio/pci/nvlink2gpu_trace.h
@@ -62,37 +62,12 @@ TRACE_EVENT(vfio_pci_nvgpu_mmap,
__entry->ua, __entry->size, __entry->ret)
);
-TRACE_EVENT(vfio_pci_npu2_mmap,
- TP_PROTO(struct pci_dev *pdev, unsigned long hpa, unsigned long ua,
- unsigned long size, int ret),
- TP_ARGS(pdev, hpa, ua, size, ret),
-
- TP_STRUCT__entry(
- __field(const char *, name)
- __field(unsigned long, hpa)
- __field(unsigned long, ua)
- __field(unsigned long, size)
- __field(int, ret)
- ),
-
- TP_fast_assign(
- __entry->name = dev_name(&pdev->dev),
- __entry->hpa = hpa;
- __entry->ua = ua;
- __entry->size = size;
- __entry->ret = ret;
- ),
-
- TP_printk("%s: %lx -> %lx size=%lx ret=%d", __entry->name, __entry->hpa,
- __entry->ua, __entry->size, __entry->ret)
-);
-
#endif /* _TRACE_VFIO_PCI_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH ../../drivers/vfio/pci
#undef TRACE_INCLUDE_FILE
-#define TRACE_INCLUDE_FILE trace
+#define TRACE_INCLUDE_FILE nvlink2gpu_trace
/* This part must be outside protection */
#include <trace/define_trace.h>
diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index ba5dd4321487..4de8e352df9c 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -356,7 +356,7 @@ int vfio_pci_core_enable(struct vfio_pci_core_device *vdev)
if (pdev->vendor == PCI_VENDOR_ID_NVIDIA &&
IS_ENABLED(CONFIG_VFIO_PCI_NVLINK2)) {
- ret = vfio_pci_nvdia_v100_nvlink2_init(vdev);
+ ret = vfio_pci_nvidia_v100_nvlink2_init(vdev);
if (ret && ret != -ENODEV) {
pci_warn(pdev, "Failed to setup NVIDIA NV2 RAM region\n");
goto disable_exit;
diff --git a/drivers/vfio/pci/vfio_pci_core.h b/drivers/vfio/pci/vfio_pci_core.h
index 60b42df6c519..8989443c3086 100644
--- a/drivers/vfio/pci/vfio_pci_core.h
+++ b/drivers/vfio/pci/vfio_pci_core.h
@@ -205,10 +205,10 @@ static inline int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
}
#endif
#ifdef CONFIG_VFIO_PCI_NVLINK2
-extern int vfio_pci_nvdia_v100_nvlink2_init(struct vfio_pci_core_device *vdev);
+extern int vfio_pci_nvidia_v100_nvlink2_init(struct vfio_pci_core_device *vdev);
extern int vfio_pci_ibm_npu2_init(struct vfio_pci_core_device *vdev);
#else
-static inline int vfio_pci_nvdia_v100_nvlink2_init(struct vfio_pci_core_device *vdev)
+static inline int vfio_pci_nvidia_v100_nvlink2_init(struct vfio_pci_core_device *vdev)
{
return -ENODEV;
}
diff --git a/drivers/vfio/pci/vfio_pci_npu2.c b/drivers/vfio/pci/vfio_pci_npu2.c
new file mode 100644
index 000000000000..717745256ab3
--- /dev/null
+++ b/drivers/vfio/pci/vfio_pci_npu2.c
@@ -0,0 +1,222 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VFIO PCI driver for POWER9 NPU support (NVLink2 host bus adapter).
+ *
+ * Copyright (c) 2020, Mellanox Technologies, Ltd. All rights reserved.
+ *
+ * Copyright (C) 2018 IBM Corp. All rights reserved.
+ * Author: Alexey Kardashevskiy <aik@...abs.ru>
+ *
+ * Register an on-GPU RAM region for cacheable access.
+ *
+ * Derived from original vfio_pci_igd.c:
+ * Copyright (C) 2016 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@...hat.com>
+ */
+
+#include <linux/io.h>
+#include <linux/pci.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/sched/mm.h>
+#include <linux/mmu_context.h>
+#include <asm/kvm_ppc.h>
+
+#include "vfio_pci_core.h"
+
+#define CREATE_TRACE_POINTS
+#include "npu2_trace.h"
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(vfio_pci_npu2_mmap);
+
+struct vfio_pci_npu2_data {
+ void *base; /* ATSD register virtual address, for emulated access */
+ unsigned long mmio_atsd; /* ATSD physical address */
+ unsigned long gpu_tgt; /* TGT address of corresponding GPU RAM */
+ unsigned int link_speed; /* The link speed from DT's ibm,nvlink-speed */
+};
+
+static size_t vfio_pci_npu2_rw(struct vfio_pci_core_device *vdev,
+ char __user *buf, size_t count, loff_t *ppos, bool iswrite)
+{
+ unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) - VFIO_PCI_NUM_REGIONS;
+ struct vfio_pci_npu2_data *data = vdev->region[i].data;
+ loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
+
+ if (pos >= vdev->region[i].size)
+ return -EINVAL;
+
+ count = min(count, (size_t)(vdev->region[i].size - pos));
+
+ if (iswrite) {
+ if (copy_from_user(data->base + pos, buf, count))
+ return -EFAULT;
+ } else {
+ if (copy_to_user(buf, data->base + pos, count))
+ return -EFAULT;
+ }
+ *ppos += count;
+
+ return count;
+}
+
+static int vfio_pci_npu2_mmap(struct vfio_pci_core_device *vdev,
+ struct vfio_pci_region *region, struct vm_area_struct *vma)
+{
+ int ret;
+ struct vfio_pci_npu2_data *data = region->data;
+ unsigned long req_len = vma->vm_end - vma->vm_start;
+
+ if (req_len != PAGE_SIZE)
+ return -EINVAL;
+
+ vma->vm_flags |= VM_PFNMAP;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ ret = remap_pfn_range(vma, vma->vm_start, data->mmio_atsd >> PAGE_SHIFT,
+ req_len, vma->vm_page_prot);
+ trace_vfio_pci_npu2_mmap(vdev->pdev, data->mmio_atsd, vma->vm_start,
+ vma->vm_end - vma->vm_start, ret);
+
+ return ret;
+}
+
+static void vfio_pci_npu2_release(struct vfio_pci_core_device *vdev,
+ struct vfio_pci_region *region)
+{
+ struct vfio_pci_npu2_data *data = region->data;
+
+ memunmap(data->base);
+ kfree(data);
+}
+
+static int vfio_pci_npu2_add_capability(struct vfio_pci_core_device *vdev,
+ struct vfio_pci_region *region, struct vfio_info_cap *caps)
+{
+ struct vfio_pci_npu2_data *data = region->data;
+ struct vfio_region_info_cap_nvlink2_ssatgt captgt = {
+ .header.id = VFIO_REGION_INFO_CAP_NVLINK2_SSATGT,
+ .header.version = 1,
+ .tgt = data->gpu_tgt
+ };
+ struct vfio_region_info_cap_nvlink2_lnkspd capspd = {
+ .header.id = VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD,
+ .header.version = 1,
+ .link_speed = data->link_speed
+ };
+ int ret;
+
+ ret = vfio_info_add_capability(caps, &captgt.header, sizeof(captgt));
+ if (ret)
+ return ret;
+
+ return vfio_info_add_capability(caps, &capspd.header, sizeof(capspd));
+}
+
+static const struct vfio_pci_regops vfio_pci_npu2_regops = {
+ .rw = vfio_pci_npu2_rw,
+ .mmap = vfio_pci_npu2_mmap,
+ .release = vfio_pci_npu2_release,
+ .add_capability = vfio_pci_npu2_add_capability,
+};
+
+int vfio_pci_ibm_npu2_init(struct vfio_pci_core_device *vdev)
+{
+ int ret;
+ struct vfio_pci_npu2_data *data;
+ struct device_node *nvlink_dn;
+ u32 nvlink_index = 0, mem_phandle = 0;
+ struct pci_dev *npdev = vdev->pdev;
+ struct device_node *npu_node = pci_device_to_OF_node(npdev);
+ struct pci_controller *hose = pci_bus_to_host(npdev->bus);
+ u64 mmio_atsd = 0;
+ u64 tgt = 0;
+ u32 link_speed = 0xff;
+
+ /*
+ * PCI config space does not tell us about NVLink presense but
+ * platform does, use this.
+ */
+ if (!pnv_pci_get_gpu_dev(vdev->pdev))
+ return -ENODEV;
+
+ if (of_property_read_u32(npu_node, "memory-region", &mem_phandle))
+ return -ENODEV;
+
+ /*
+ * NPU2 normally has 8 ATSD registers (for concurrency) and 6 links
+ * so we can allocate one register per link, using nvlink index as
+ * a key.
+ * There is always at least one ATSD register so as long as at least
+ * NVLink bridge #0 is passed to the guest, ATSD will be available.
+ */
+ nvlink_dn = of_parse_phandle(npdev->dev.of_node, "ibm,nvlink", 0);
+ if (WARN_ON(of_property_read_u32(nvlink_dn, "ibm,npu-link-index",
+ &nvlink_index)))
+ return -ENODEV;
+
+ if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", nvlink_index,
+ &mmio_atsd)) {
+ if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", 0,
+ &mmio_atsd)) {
+ dev_warn(&vdev->pdev->dev, "No available ATSD found\n");
+ mmio_atsd = 0;
+ } else {
+ dev_warn(&vdev->pdev->dev,
+ "Using fallback ibm,mmio-atsd[0] for ATSD.\n");
+ }
+ }
+
+ if (of_property_read_u64(npu_node, "ibm,device-tgt-addr", &tgt)) {
+ dev_warn(&vdev->pdev->dev, "No ibm,device-tgt-addr found\n");
+ return -EFAULT;
+ }
+
+ if (of_property_read_u32(npu_node, "ibm,nvlink-speed", &link_speed)) {
+ dev_warn(&vdev->pdev->dev, "No ibm,nvlink-speed found\n");
+ return -EFAULT;
+ }
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->mmio_atsd = mmio_atsd;
+ data->gpu_tgt = tgt;
+ data->link_speed = link_speed;
+ if (data->mmio_atsd) {
+ data->base = memremap(data->mmio_atsd, SZ_64K, MEMREMAP_WT);
+ if (!data->base) {
+ ret = -ENOMEM;
+ goto free_exit;
+ }
+ }
+
+ /*
+ * We want to expose the capability even if this specific NVLink
+ * did not get its own ATSD register because capabilities
+ * belong to VFIO regions and normally there will be ATSD register
+ * assigned to the NVLink bridge.
+ */
+ ret = vfio_pci_register_dev_region(vdev,
+ PCI_VENDOR_ID_IBM |
+ VFIO_REGION_TYPE_PCI_VENDOR_TYPE,
+ VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD,
+ &vfio_pci_npu2_regops,
+ data->mmio_atsd ? PAGE_SIZE : 0,
+ VFIO_REGION_INFO_FLAG_READ |
+ VFIO_REGION_INFO_FLAG_WRITE |
+ VFIO_REGION_INFO_FLAG_MMAP,
+ data);
+ if (ret)
+ goto free_exit;
+
+ return 0;
+
+free_exit:
+ if (data->base)
+ memunmap(data->base);
+ kfree(data);
+
+ return ret;
+}
diff --git a/drivers/vfio/pci/vfio_pci_nvlink2.c b/drivers/vfio/pci/vfio_pci_nvlink2gpu.c
similarity index 59%
rename from drivers/vfio/pci/vfio_pci_nvlink2.c
rename to drivers/vfio/pci/vfio_pci_nvlink2gpu.c
index 8ef2c62a9d27..6dce1e78ee82 100644
--- a/drivers/vfio/pci/vfio_pci_nvlink2.c
+++ b/drivers/vfio/pci/vfio_pci_nvlink2gpu.c
@@ -19,14 +19,14 @@
#include <linux/sched/mm.h>
#include <linux/mmu_context.h>
#include <asm/kvm_ppc.h>
+
#include "vfio_pci_core.h"
#define CREATE_TRACE_POINTS
-#include "trace.h"
+#include "nvlink2gpu_trace.h"
EXPORT_TRACEPOINT_SYMBOL_GPL(vfio_pci_nvgpu_mmap_fault);
EXPORT_TRACEPOINT_SYMBOL_GPL(vfio_pci_nvgpu_mmap);
-EXPORT_TRACEPOINT_SYMBOL_GPL(vfio_pci_npu2_mmap);
struct vfio_pci_nvgpu_data {
unsigned long gpu_hpa; /* GPU RAM physical address */
@@ -207,7 +207,7 @@ static int vfio_pci_nvgpu_group_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}
-int vfio_pci_nvdia_v100_nvlink2_init(struct vfio_pci_core_device *vdev)
+int vfio_pci_nvidia_v100_nvlink2_init(struct vfio_pci_core_device *vdev)
{
int ret;
u64 reg[2];
@@ -293,198 +293,3 @@ int vfio_pci_nvdia_v100_nvlink2_init(struct vfio_pci_core_device *vdev)
return ret;
}
-
-/*
- * IBM NPU2 bridge
- */
-struct vfio_pci_npu2_data {
- void *base; /* ATSD register virtual address, for emulated access */
- unsigned long mmio_atsd; /* ATSD physical address */
- unsigned long gpu_tgt; /* TGT address of corresponding GPU RAM */
- unsigned int link_speed; /* The link speed from DT's ibm,nvlink-speed */
-};
-
-static size_t vfio_pci_npu2_rw(struct vfio_pci_core_device *vdev,
- char __user *buf, size_t count, loff_t *ppos, bool iswrite)
-{
- unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) - VFIO_PCI_NUM_REGIONS;
- struct vfio_pci_npu2_data *data = vdev->region[i].data;
- loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
-
- if (pos >= vdev->region[i].size)
- return -EINVAL;
-
- count = min(count, (size_t)(vdev->region[i].size - pos));
-
- if (iswrite) {
- if (copy_from_user(data->base + pos, buf, count))
- return -EFAULT;
- } else {
- if (copy_to_user(buf, data->base + pos, count))
- return -EFAULT;
- }
- *ppos += count;
-
- return count;
-}
-
-static int vfio_pci_npu2_mmap(struct vfio_pci_core_device *vdev,
- struct vfio_pci_region *region, struct vm_area_struct *vma)
-{
- int ret;
- struct vfio_pci_npu2_data *data = region->data;
- unsigned long req_len = vma->vm_end - vma->vm_start;
-
- if (req_len != PAGE_SIZE)
- return -EINVAL;
-
- vma->vm_flags |= VM_PFNMAP;
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
- ret = remap_pfn_range(vma, vma->vm_start, data->mmio_atsd >> PAGE_SHIFT,
- req_len, vma->vm_page_prot);
- trace_vfio_pci_npu2_mmap(vdev->pdev, data->mmio_atsd, vma->vm_start,
- vma->vm_end - vma->vm_start, ret);
-
- return ret;
-}
-
-static void vfio_pci_npu2_release(struct vfio_pci_core_device *vdev,
- struct vfio_pci_region *region)
-{
- struct vfio_pci_npu2_data *data = region->data;
-
- memunmap(data->base);
- kfree(data);
-}
-
-static int vfio_pci_npu2_add_capability(struct vfio_pci_core_device *vdev,
- struct vfio_pci_region *region, struct vfio_info_cap *caps)
-{
- struct vfio_pci_npu2_data *data = region->data;
- struct vfio_region_info_cap_nvlink2_ssatgt captgt = {
- .header.id = VFIO_REGION_INFO_CAP_NVLINK2_SSATGT,
- .header.version = 1,
- .tgt = data->gpu_tgt
- };
- struct vfio_region_info_cap_nvlink2_lnkspd capspd = {
- .header.id = VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD,
- .header.version = 1,
- .link_speed = data->link_speed
- };
- int ret;
-
- ret = vfio_info_add_capability(caps, &captgt.header, sizeof(captgt));
- if (ret)
- return ret;
-
- return vfio_info_add_capability(caps, &capspd.header, sizeof(capspd));
-}
-
-static const struct vfio_pci_regops vfio_pci_npu2_regops = {
- .rw = vfio_pci_npu2_rw,
- .mmap = vfio_pci_npu2_mmap,
- .release = vfio_pci_npu2_release,
- .add_capability = vfio_pci_npu2_add_capability,
-};
-
-int vfio_pci_ibm_npu2_init(struct vfio_pci_core_device *vdev)
-{
- int ret;
- struct vfio_pci_npu2_data *data;
- struct device_node *nvlink_dn;
- u32 nvlink_index = 0, mem_phandle = 0;
- struct pci_dev *npdev = vdev->pdev;
- struct device_node *npu_node = pci_device_to_OF_node(npdev);
- struct pci_controller *hose = pci_bus_to_host(npdev->bus);
- u64 mmio_atsd = 0;
- u64 tgt = 0;
- u32 link_speed = 0xff;
-
- /*
- * PCI config space does not tell us about NVLink presense but
- * platform does, use this.
- */
- if (!pnv_pci_get_gpu_dev(vdev->pdev))
- return -ENODEV;
-
- if (of_property_read_u32(npu_node, "memory-region", &mem_phandle))
- return -ENODEV;
-
- /*
- * NPU2 normally has 8 ATSD registers (for concurrency) and 6 links
- * so we can allocate one register per link, using nvlink index as
- * a key.
- * There is always at least one ATSD register so as long as at least
- * NVLink bridge #0 is passed to the guest, ATSD will be available.
- */
- nvlink_dn = of_parse_phandle(npdev->dev.of_node, "ibm,nvlink", 0);
- if (WARN_ON(of_property_read_u32(nvlink_dn, "ibm,npu-link-index",
- &nvlink_index)))
- return -ENODEV;
-
- if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", nvlink_index,
- &mmio_atsd)) {
- if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", 0,
- &mmio_atsd)) {
- dev_warn(&vdev->pdev->dev, "No available ATSD found\n");
- mmio_atsd = 0;
- } else {
- dev_warn(&vdev->pdev->dev,
- "Using fallback ibm,mmio-atsd[0] for ATSD.\n");
- }
- }
-
- if (of_property_read_u64(npu_node, "ibm,device-tgt-addr", &tgt)) {
- dev_warn(&vdev->pdev->dev, "No ibm,device-tgt-addr found\n");
- return -EFAULT;
- }
-
- if (of_property_read_u32(npu_node, "ibm,nvlink-speed", &link_speed)) {
- dev_warn(&vdev->pdev->dev, "No ibm,nvlink-speed found\n");
- return -EFAULT;
- }
-
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->mmio_atsd = mmio_atsd;
- data->gpu_tgt = tgt;
- data->link_speed = link_speed;
- if (data->mmio_atsd) {
- data->base = memremap(data->mmio_atsd, SZ_64K, MEMREMAP_WT);
- if (!data->base) {
- ret = -ENOMEM;
- goto free_exit;
- }
- }
-
- /*
- * We want to expose the capability even if this specific NVLink
- * did not get its own ATSD register because capabilities
- * belong to VFIO regions and normally there will be ATSD register
- * assigned to the NVLink bridge.
- */
- ret = vfio_pci_register_dev_region(vdev,
- PCI_VENDOR_ID_IBM |
- VFIO_REGION_TYPE_PCI_VENDOR_TYPE,
- VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD,
- &vfio_pci_npu2_regops,
- data->mmio_atsd ? PAGE_SIZE : 0,
- VFIO_REGION_INFO_FLAG_READ |
- VFIO_REGION_INFO_FLAG_WRITE |
- VFIO_REGION_INFO_FLAG_MMAP,
- data);
- if (ret)
- goto free_exit;
-
- return 0;
-
-free_exit:
- if (data->base)
- memunmap(data->base);
- kfree(data);
-
- return ret;
-}
--
2.25.4
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