Revert "cxl: Allow a default context to be associated with an external pci_dev"

Remove abandonned capi support for the Mellanox CX4.

This reverts commit a19bd79e31769626d288cc016e21a31b6f47bf6f.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

7 files changed, 28 insertions, 97 deletions

diff --git a/drivers/misc/cxl/Makefile b/drivers/misc/cxl/Makefile
index 502d41fc9ea5..5eea61b9584f 100644
--- a/drivers/misc/cxl/Makefile
+++ b/drivers/misc/cxl/Makefile
@@ -4,7 +4,7 @@ ccflags-$(CONFIG_PPC_WERROR)	+= -Werror
 
 cxl-y                           += main.o file.o irq.o fault.o native.o
 cxl-y                           += context.o sysfs.o pci.o trace.o
-cxl-y                           += vphb.o phb.o api.o cxllib.o
+cxl-y                           += vphb.o api.o cxllib.o
 cxl-$(CONFIG_PPC_PSERIES)       += flash.o guest.o of.o hcalls.o
 cxl-$(CONFIG_DEBUG_FS)          += debugfs.o
 obj-$(CONFIG_CXL)               += cxl.o
diff --git a/drivers/misc/cxl/base.c b/drivers/misc/cxl/base.c
index e1e80cb99ad9..7557835cdfcd 100644
--- a/drivers/misc/cxl/base.c
+++ b/drivers/misc/cxl/base.c
@@ -106,41 +106,6 @@ int cxl_update_properties(struct device_node *dn,
 }
 EXPORT_SYMBOL_GPL(cxl_update_properties);
 
-/*
- * API calls into the driver that may be called from the PHB code and must be
- * built in.
- */
-bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu)
-{
-        bool ret;
-        struct cxl_calls *calls;
-
-        calls = cxl_calls_get();
-        if (!calls)
-                return false;
-
-        ret = calls->cxl_pci_associate_default_context(dev, afu);
-
-        cxl_calls_put(calls);
-
-        return ret;
-}
-EXPORT_SYMBOL_GPL(cxl_pci_associate_default_context);
-
-void cxl_pci_disable_device(struct pci_dev *dev)
-{
-        struct cxl_calls *calls;
-
-        calls = cxl_calls_get();
-        if (!calls)
-                return;
-
-        calls->cxl_pci_disable_device(dev);
-
-        cxl_calls_put(calls);
-}
-EXPORT_SYMBOL_GPL(cxl_pci_disable_device);
-
 static int __init cxl_base_init(void)
 {
         struct device_node *np;
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index d95c2c98f2ab..aa453448201d 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -867,15 +867,9 @@ static inline bool cxl_is_power9_dd1(void)
 ssize_t cxl_pci_afu_read_err_buffer(struct cxl_afu *afu, char *buf,
                                 loff_t off, size_t count);
 
-/* Internal functions wrapped in cxl_base to allow PHB to call them */
-bool _cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu);
-void _cxl_pci_disable_device(struct pci_dev *dev);
 
 struct cxl_calls {
         void (*cxl_slbia)(struct mm_struct *mm);
-        bool (*cxl_pci_associate_default_context)(struct pci_dev *dev, struct cxl_afu *afu);
-        void (*cxl_pci_disable_device)(struct pci_dev *dev);
-
         struct module *owner;
 };
 int register_cxl_calls(struct cxl_calls *calls);
diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
index a7e83624034b..334223b802ee 100644
--- a/drivers/misc/cxl/main.c
+++ b/drivers/misc/cxl/main.c
@@ -104,8 +104,6 @@ static inline void cxl_slbia_core(struct mm_struct *mm)
 
 static struct cxl_calls cxl_calls = {
         .cxl_slbia = cxl_slbia_core,
-        .cxl_pci_associate_default_context = _cxl_pci_associate_default_context,
-        .cxl_pci_disable_device = _cxl_pci_disable_device,
         .owner = THIS_MODULE,
 };
 
diff --git a/drivers/misc/cxl/phb.c b/drivers/misc/cxl/phb.c
deleted file mode 100644
index 6ec69ada19f4..000000000000
--- a/drivers/misc/cxl/phb.c
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * Copyright 2014-2016 IBM Corp.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/pci.h>
-#include "cxl.h"
-
-bool _cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu)
-{
-        struct cxl_context *ctx;
-
-        /*
-         * Allocate a context to do cxl things to. This is used for interrupts
-         * in the peer model using a real phb, and if we eventually do DMA ops
-         * in the virtual phb, we'll need a default context to attach them to.
-         */
-        ctx = cxl_dev_context_init(dev);
-        if (IS_ERR(ctx))
-                return false;
-        dev->dev.archdata.cxl_ctx = ctx;
-
-        return (cxl_ops->afu_check_and_enable(afu) == 0);
-}
-/* exported via cxl_base */
-
-void _cxl_pci_disable_device(struct pci_dev *dev)
-{
-        struct cxl_context *ctx = cxl_get_context(dev);
-
-        if (ctx) {
-                if (ctx->status == STARTED) {
-                        dev_err(&dev->dev, "Default context started\n");
-                        return;
-                }
-                dev->dev.archdata.cxl_ctx = NULL;
-                cxl_release_context(ctx);
-        }
-}
-/* exported via cxl_base */
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index 1a99c9c7a6fb..7908633d9204 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c
@@ -44,6 +44,7 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
 {
         struct pci_controller *phb;
         struct cxl_afu *afu;
+        struct cxl_context *ctx;
 
         phb = pci_bus_to_host(dev->bus);
         afu = (struct cxl_afu *)phb->private_data;
@@ -56,7 +57,30 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
         set_dma_ops(&dev->dev, &dma_nommu_ops);
         set_dma_offset(&dev->dev, PAGE_OFFSET);
 
-        return _cxl_pci_associate_default_context(dev, afu);
+        /*
+         * Allocate a context to do cxl things too.  If we eventually do real
+         * DMA ops, we'll need a default context to attach them to
+         */
+        ctx = cxl_dev_context_init(dev);
+        if (IS_ERR(ctx))
+                return false;
+        dev->dev.archdata.cxl_ctx = ctx;
+
+        return (cxl_ops->afu_check_and_enable(afu) == 0);
+}
+
+static void cxl_pci_disable_device(struct pci_dev *dev)
+{
+        struct cxl_context *ctx = cxl_get_context(dev);
+
+        if (ctx) {
+                if (ctx->status == STARTED) {
+                        dev_err(&dev->dev, "Default context started\n");
+                        return;
+                }
+                dev->dev.archdata.cxl_ctx = NULL;
+                cxl_release_context(ctx);
+        }
 }
 
 static resource_size_t cxl_pci_window_alignment(struct pci_bus *bus,
@@ -190,8 +214,8 @@ static struct pci_controller_ops cxl_pci_controller_ops =
 {
         .probe_mode = cxl_pci_probe_mode,
         .enable_device_hook = cxl_pci_enable_device_hook,
-        .disable_device = _cxl_pci_disable_device,
-        .release_device = _cxl_pci_disable_device,
+        .disable_device = cxl_pci_disable_device,
+        .release_device = cxl_pci_disable_device,
         .window_alignment = cxl_pci_window_alignment,
         .reset_secondary_bus = cxl_pci_reset_secondary_bus,
         .setup_msi_irqs = cxl_setup_msi_irqs,
diff --git a/include/misc/cxl-base.h b/include/misc/cxl-base.h
index bb7e629ae492..f53808fa638a 100644
--- a/include/misc/cxl-base.h
+++ b/include/misc/cxl-base.h
@@ -10,8 +10,6 @@
 #ifndef _MISC_CXL_BASE_H
 #define _MISC_CXL_BASE_H
 
-#include <misc/cxl.h>
-
 #ifdef CONFIG_CXL_BASE
 
 #define CXL_IRQ_RANGES 4
@@ -41,8 +39,6 @@ static inline void cxl_ctx_put(void)
 struct cxl_afu *cxl_afu_get(struct cxl_afu *afu);
 void cxl_afu_put(struct cxl_afu *afu);
 void cxl_slbia(struct mm_struct *mm);
-bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu);
-void cxl_pci_disable_device(struct pci_dev *dev);
 
 #else /* CONFIG_CXL_BASE */
 
@@ -50,8 +46,6 @@ static inline bool cxl_ctx_in_use(void) { return false; }
 static inline struct cxl_afu *cxl_afu_get(struct cxl_afu *afu) { return NULL; }
 static inline void cxl_afu_put(struct cxl_afu *afu) {}
 static inline void cxl_slbia(struct mm_struct *mm) {}
-static inline bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu) { return false; }
-static inline void cxl_pci_disable_device(struct pci_dev *dev) {}
 
 #endif /* CONFIG_CXL_BASE */