| Message ID | 20190613094326.24093-14-hch@lst.de (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [01/22] mm: remove the unused ARCH_HAS_HMM_DEVICE Kconfig option | expand |
On Thu, Jun 13, 2019 at 11:43:16AM +0200, Christoph Hellwig wrote: > The functionality is identical to the one currently open coded in > device-dax. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/dax/dax-private.h | 4 --- > drivers/dax/device.c | 52 +-------------------------------------- > 2 files changed, 1 insertion(+), 55 deletions(-) > > diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h > index a45612148ca0..ed04a18a35be 100644 > --- a/drivers/dax/dax-private.h > +++ b/drivers/dax/dax-private.h > @@ -51,8 +51,6 @@ struct dax_region { > * @target_node: effective numa node if dev_dax memory range is onlined > * @dev - device core > * @pgmap - pgmap for memmap setup / lifetime (driver owned) > - * @ref: pgmap reference count (driver owned) > - * @cmp: @ref final put completion (driver owned) > */ > struct dev_dax { > struct dax_region *region; > @@ -60,8 +58,6 @@ struct dev_dax { > int target_node; > struct device dev; > struct dev_pagemap pgmap; > - struct percpu_ref ref; > - struct completion cmp; > }; > > static inline struct dev_dax *to_dev_dax(struct device *dev) > diff --git a/drivers/dax/device.c b/drivers/dax/device.c > index e23fa1bd8c97..a9d7c90ecf1e 100644 > --- a/drivers/dax/device.c > +++ b/drivers/dax/device.c > @@ -14,37 +14,6 @@ > #include "dax-private.h" > #include "bus.h" > > -static struct dev_dax *ref_to_dev_dax(struct percpu_ref *ref) > -{ > - return container_of(ref, struct dev_dax, ref); > -} > - > -static void dev_dax_percpu_release(struct percpu_ref *ref) > -{ > - struct dev_dax *dev_dax = ref_to_dev_dax(ref); > - > - dev_dbg(&dev_dax->dev, "%s\n", __func__); > - complete(&dev_dax->cmp); > -} > - > -static void dev_dax_percpu_exit(void *data) > -{ > - struct percpu_ref *ref = data; > - struct dev_dax *dev_dax = ref_to_dev_dax(ref); > - > - dev_dbg(&dev_dax->dev, "%s\n", __func__); > - wait_for_completion(&dev_dax->cmp); > - percpu_ref_exit(ref); > -} > - > -static void dev_dax_percpu_kill(struct dev_pagemap *pgmap) > -{ > - struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap); > - > - dev_dbg(&dev_dax->dev, "%s\n", __func__); > - percpu_ref_kill(pgmap->ref); > -} > - > static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, > const char *func) > { > @@ -442,10 +411,6 @@ static void dev_dax_kill(void *dev_dax) > kill_dev_dax(dev_dax); > } > > -static const struct dev_pagemap_ops dev_dax_pagemap_ops = { > - .kill = dev_dax_percpu_kill, > -}; > - > int dev_dax_probe(struct device *dev) > { > struct dev_dax *dev_dax = to_dev_dax(dev); > @@ -463,24 +428,9 @@ int dev_dax_probe(struct device *dev) > return -EBUSY; > } > > - init_completion(&dev_dax->cmp); > - rc = percpu_ref_init(&dev_dax->ref, dev_dax_percpu_release, 0, > - GFP_KERNEL); > - if (rc) > - return rc; > - > - rc = devm_add_action_or_reset(dev, dev_dax_percpu_exit, &dev_dax->ref); > - if (rc) > - return rc; > - > - dev_dax->pgmap.ref = &dev_dax->ref; I don't think this exactly correct. pgmap.ref is a pointer to the dev_dax ref structure. Taking it away will cause devm_memremap_pages() to fail AFAICS. I think you need to change struct dev_pagemap as well: diff --git a/include/linux/memremap.h b/include/linux/memremap.h index f0628660d541..5e2120589ddf 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -90,7 +90,7 @@ struct dev_pagemap { struct vmem_altmap altmap; bool altmap_valid; struct resource res; - struct percpu_ref *ref; + struct percpu_ref ref; void (*kill)(struct percpu_ref *ref); struct device *dev; void *data; And all usages of it, right? Ira > - dev_dax->pgmap.ops = &dev_dax_pagemap_ops; > addr = devm_memremap_pages(dev, &dev_dax->pgmap); > - if (IS_ERR(addr)) { > - devm_remove_action(dev, dev_dax_percpu_exit, &dev_dax->ref); > - percpu_ref_exit(&dev_dax->ref); > + if (IS_ERR(addr)) > return PTR_ERR(addr); > - } > > inode = dax_inode(dax_dev); > cdev = inode->i_cdev; > -- > 2.20.1 > > _______________________________________________ > Linux-nvdimm mailing list > Linux-nvdimm@lists.01.org > https://lists.01.org/mailman/listinfo/linux-nvdimm
On Thu, Jun 13, 2019 at 05:22:17PM -0700, Ira Weiny wrote: > > - dev_dax->pgmap.ref = &dev_dax->ref; > > I don't think this exactly correct. pgmap.ref is a pointer to the dev_dax ref > structure. Taking it away will cause devm_memremap_pages() to fail AFAICS. > > I think you need to change struct dev_pagemap as well: Take a look at the previous patch, which adds an internal_ref field to dev_pagemap that ->ref is set up to point to if not otherwise initialized.
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h index a45612148ca0..ed04a18a35be 100644 --- a/drivers/dax/dax-private.h +++ b/drivers/dax/dax-private.h @@ -51,8 +51,6 @@ struct dax_region { * @target_node: effective numa node if dev_dax memory range is onlined * @dev - device core * @pgmap - pgmap for memmap setup / lifetime (driver owned) - * @ref: pgmap reference count (driver owned) - * @cmp: @ref final put completion (driver owned) */ struct dev_dax { struct dax_region *region; @@ -60,8 +58,6 @@ struct dev_dax { int target_node; struct device dev; struct dev_pagemap pgmap; - struct percpu_ref ref; - struct completion cmp; }; static inline struct dev_dax *to_dev_dax(struct device *dev) diff --git a/drivers/dax/device.c b/drivers/dax/device.c index e23fa1bd8c97..a9d7c90ecf1e 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -14,37 +14,6 @@ #include "dax-private.h" #include "bus.h" -static struct dev_dax *ref_to_dev_dax(struct percpu_ref *ref) -{ - return container_of(ref, struct dev_dax, ref); -} - -static void dev_dax_percpu_release(struct percpu_ref *ref) -{ - struct dev_dax *dev_dax = ref_to_dev_dax(ref); - - dev_dbg(&dev_dax->dev, "%s\n", __func__); - complete(&dev_dax->cmp); -} - -static void dev_dax_percpu_exit(void *data) -{ - struct percpu_ref *ref = data; - struct dev_dax *dev_dax = ref_to_dev_dax(ref); - - dev_dbg(&dev_dax->dev, "%s\n", __func__); - wait_for_completion(&dev_dax->cmp); - percpu_ref_exit(ref); -} - -static void dev_dax_percpu_kill(struct dev_pagemap *pgmap) -{ - struct dev_dax *dev_dax = container_of(pgmap, struct dev_dax, pgmap); - - dev_dbg(&dev_dax->dev, "%s\n", __func__); - percpu_ref_kill(pgmap->ref); -} - static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma, const char *func) { @@ -442,10 +411,6 @@ static void dev_dax_kill(void *dev_dax) kill_dev_dax(dev_dax); } -static const struct dev_pagemap_ops dev_dax_pagemap_ops = { - .kill = dev_dax_percpu_kill, -}; - int dev_dax_probe(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); @@ -463,24 +428,9 @@ int dev_dax_probe(struct device *dev) return -EBUSY; } - init_completion(&dev_dax->cmp); - rc = percpu_ref_init(&dev_dax->ref, dev_dax_percpu_release, 0, - GFP_KERNEL); - if (rc) - return rc; - - rc = devm_add_action_or_reset(dev, dev_dax_percpu_exit, &dev_dax->ref); - if (rc) - return rc; - - dev_dax->pgmap.ref = &dev_dax->ref; - dev_dax->pgmap.ops = &dev_dax_pagemap_ops; addr = devm_memremap_pages(dev, &dev_dax->pgmap); - if (IS_ERR(addr)) { - devm_remove_action(dev, dev_dax_percpu_exit, &dev_dax->ref); - percpu_ref_exit(&dev_dax->ref); + if (IS_ERR(addr)) return PTR_ERR(addr); - } inode = dax_inode(dax_dev); cdev = inode->i_cdev;
The functionality is identical to the one currently open coded in device-dax. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/dax/dax-private.h | 4 --- drivers/dax/device.c | 52 +-------------------------------------- 2 files changed, 1 insertion(+), 55 deletions(-)