device-dax: introduce 'struct dev_dax' typed-driver operations

In preparation for introducing seed devices the dax-bus core needs to be
able to intercept ->probe() and ->remove() operations.  Towards that end
arrange for the bus and drivers to switch from raw 'struct device' driver
operations to 'struct dev_dax' typed operations.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jia He <justin.he@arm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/160106113357.30709.4541750544799737855.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index 0a48ce3..9549f11 100644 (file)
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -135,10 +135,28 @@ static bool is_static(struct dax_region *dax_region)
        return (dax_region->res.flags & IORESOURCE_DAX_STATIC) != 0;
 }
 
+static int dax_bus_probe(struct device *dev)
+{
+       struct dax_device_driver *dax_drv = to_dax_drv(dev->driver);
+       struct dev_dax *dev_dax = to_dev_dax(dev);
+
+       return dax_drv->probe(dev_dax);
+}
+
+static int dax_bus_remove(struct device *dev)
+{
+       struct dax_device_driver *dax_drv = to_dax_drv(dev->driver);
+       struct dev_dax *dev_dax = to_dev_dax(dev);
+
+       return dax_drv->remove(dev_dax);
+}
+
 static struct bus_type dax_bus_type = {
        .name = "dax",
        .uevent = dax_bus_uevent,
        .match = dax_bus_match,
+       .probe = dax_bus_probe,
+       .remove = dax_bus_remove,
        .drv_groups = dax_drv_groups,
 };
 

diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h
index 44592a8..da27ea7 100644 (file)
--- a/drivers/dax/bus.h
+++ b/drivers/dax/bus.h
@@ -38,6 +38,8 @@ struct dax_device_driver {
        struct device_driver drv;
        struct list_head ids;
        int match_always;
+       int (*probe)(struct dev_dax *dev);
+       int (*remove)(struct dev_dax *dev);
 };
 
 int __dax_driver_register(struct dax_device_driver *dax_drv,
@@ -48,7 +50,7 @@ void dax_driver_unregister(struct dax_device_driver *dax_drv);
 void kill_dev_dax(struct dev_dax *dev_dax);
 
 #if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
-int dev_dax_probe(struct device *dev);
+int dev_dax_probe(struct dev_dax *dev_dax);
 #endif
 
 /*

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 287cf0a..9833fa8 100644 (file)
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -392,11 +392,11 @@ static void dev_dax_kill(void *dev_dax)
        kill_dev_dax(dev_dax);
 }
 
-int dev_dax_probe(struct device *dev)
+int dev_dax_probe(struct dev_dax *dev_dax)
 {
-       struct dev_dax *dev_dax = to_dev_dax(dev);
        struct dax_device *dax_dev = dev_dax->dax_dev;
        struct range *range = &dev_dax->range;
+       struct device *dev = &dev_dax->dev;
        struct dev_pagemap *pgmap;
        struct inode *inode;
        struct cdev *cdev;
@@ -446,17 +446,15 @@ int dev_dax_probe(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_dax_probe);
 
-static int dev_dax_remove(struct device *dev)
+static int dev_dax_remove(struct dev_dax *dev_dax)
 {
        /* all probe actions are unwound by devm */
        return 0;
 }
 
 static struct dax_device_driver device_dax_driver = {
-       .drv = {
-               .probe = dev_dax_probe,
-               .remove = dev_dax_remove,
-       },
+       .probe = dev_dax_probe,
+       .remove = dev_dax_remove,
        .match_always = 1,
 };
 

diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
index e56fc68..c2ac465 100644 (file)
--- a/drivers/dax/kmem.c
+++ b/drivers/dax/kmem.c
@@ -29,10 +29,10 @@ static struct range dax_kmem_range(struct dev_dax *dev_dax)
        return range;
 }
 
-int dev_dax_kmem_probe(struct device *dev)
+static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
 {
-       struct dev_dax *dev_dax = to_dev_dax(dev);
        struct range range = dax_kmem_range(dev_dax);
+       struct device *dev = &dev_dax->dev;
        struct resource *res;
        char *res_name;
        int numa_node;
@@ -88,12 +88,12 @@ int dev_dax_kmem_probe(struct device *dev)
 }
 
 #ifdef CONFIG_MEMORY_HOTREMOVE
-static int dev_dax_kmem_remove(struct device *dev)
+static int dev_dax_kmem_remove(struct dev_dax *dev_dax)
 {
-       struct dev_dax *dev_dax = to_dev_dax(dev);
+       int rc;
+       struct device *dev = &dev_dax->dev;
        struct range range = dax_kmem_range(dev_dax);
        const char *res_name = dev_get_drvdata(dev);
-       int rc;
 
        /*
         * We have one shot for removing memory, if some memory blocks were not
@@ -116,7 +116,7 @@ static int dev_dax_kmem_remove(struct device *dev)
        return 0;
 }
 #else
-static int dev_dax_kmem_remove(struct device *dev)
+static int dev_dax_kmem_remove(struct dev_dax *dev_dax)
 {
        /*
         * Without hotremove purposely leak the request_mem_region() for the
@@ -131,10 +131,8 @@ static int dev_dax_kmem_remove(struct device *dev)
 #endif /* CONFIG_MEMORY_HOTREMOVE */
 
 static struct dax_device_driver device_dax_kmem_driver = {
-       .drv = {
-               .probe = dev_dax_kmem_probe,
-               .remove = dev_dax_kmem_remove,
-       },
+       .probe = dev_dax_kmem_probe,
+       .remove = dev_dax_kmem_remove,
 };
 
 static int __init dax_kmem_init(void)

diff --git a/drivers/dax/pmem/compat.c b/drivers/dax/pmem/compat.c
index d7b15e6..863c114 100644 (file)
--- a/drivers/dax/pmem/compat.c
+++ b/drivers/dax/pmem/compat.c
@@ -22,7 +22,7 @@ static int dax_pmem_compat_probe(struct device *dev)
                return -ENOMEM;
 
        device_lock(&dev_dax->dev);
-       rc = dev_dax_probe(&dev_dax->dev);
+       rc = dev_dax_probe(dev_dax);
        device_unlock(&dev_dax->dev);
 
        devres_close_group(&dev_dax->dev, dev_dax);