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Subject: [PATCH v3 20/23] device-dax: Make align a per-device property
From:   Dan Williams <dan.j.williams@intel.com>
To:     akpm@linux-foundation.org
Cc:     Joao Martins <joao.m.martins@oracle.com>, peterz@infradead.org,
        vishal.l.verma@intel.com, dave.hansen@linux.intel.com,
        ard.biesheuvel@linaro.org, vishal.l.verma@intel.com,
        linux-mm@kvack.org, linux-nvdimm@lists.01.org,
        joao.m.martins@oracle.com, linux-kernel@vger.kernel.org,
        linux-acpi@vger.kernel.org, dri-devel@lists.freedesktop.org
Date:   Fri, 31 Jul 2020 20:26:50 -0700
Message-ID: <159625241066.3040297.5565166696242815434.stgit@dwillia2-desk3.amr.corp.intel.com>
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References: <159625229779.3040297.11363509688097221416.stgit@dwillia2-desk3.amr.corp.intel.com>
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From: Joao Martins <joao.m.martins@oracle.com>

Introduce @align to struct dev_dax.

When creating a new device, we still initialize to the default
dax_region @align. Child devices belonging to a region may wish
to keep a different alignment property instead of a global
region-defined one.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Link: https://lore.kernel.org/r/20200716172913.19658-2-joao.m.martins@oracle.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/dax/bus.c         |    1 +
 drivers/dax/dax-private.h |    1 +
 drivers/dax/device.c      |   35 +++++++++++++++--------------------
 3 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index ffb27964deb2..feca1413481c 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -1215,6 +1215,7 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
 
 	dev_dax->dax_dev = dax_dev;
 	dev_dax->target_node = dax_region->target_node;
+	dev_dax->align = dax_region->align;
 	ida_init(&dev_dax->ida);
 	kref_get(&dax_region->kref);
 
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
index 13780f62b95e..96ef5a8ae0ba 100644
--- a/drivers/dax/dax-private.h
+++ b/drivers/dax/dax-private.h
@@ -62,6 +62,7 @@ struct dax_mapping {
 struct dev_dax {
 	struct dax_region *region;
 	struct dax_device *dax_dev;
+	unsigned int align;
 	int target_node;
 	int id;
 	struct ida ida;
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 2bfc5c83e3b0..346c7bb8cf06 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -17,7 +17,6 @@
 static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
 		const char *func)
 {
-	struct dax_region *dax_region = dev_dax->region;
 	struct device *dev = &dev_dax->dev;
 	unsigned long mask;
 
@@ -32,7 +31,7 @@ static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
 		return -EINVAL;
 	}
 
-	mask = dax_region->align - 1;
+	mask = dev_dax->align - 1;
 	if (vma->vm_start & mask || vma->vm_end & mask) {
 		dev_info_ratelimited(dev,
 				"%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
@@ -86,13 +85,13 @@ static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax,
 		return VM_FAULT_SIGBUS;
 
 	dax_region = dev_dax->region;
-	if (dax_region->align > PAGE_SIZE) {
+	if (dev_dax->align > PAGE_SIZE) {
 		dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
-			dax_region->align, fault_size);
+			dev_dax->align, fault_size);
 		return VM_FAULT_SIGBUS;
 	}
 
-	if (fault_size != dax_region->align)
+	if (fault_size != dev_dax->align)
 		return VM_FAULT_SIGBUS;
 
 	phys = dax_pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE);
@@ -120,15 +119,15 @@ static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
 		return VM_FAULT_SIGBUS;
 
 	dax_region = dev_dax->region;
-	if (dax_region->align > PMD_SIZE) {
+	if (dev_dax->align > PMD_SIZE) {
 		dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
-			dax_region->align, fault_size);
+			dev_dax->align, fault_size);
 		return VM_FAULT_SIGBUS;
 	}
 
-	if (fault_size < dax_region->align)
+	if (fault_size < dev_dax->align)
 		return VM_FAULT_SIGBUS;
-	else if (fault_size > dax_region->align)
+	else if (fault_size > dev_dax->align)
 		return VM_FAULT_FALLBACK;
 
 	/* if we are outside of the VMA */
@@ -164,15 +163,15 @@ static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
 		return VM_FAULT_SIGBUS;
 
 	dax_region = dev_dax->region;
-	if (dax_region->align > PUD_SIZE) {
+	if (dev_dax->align > PUD_SIZE) {
 		dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
-			dax_region->align, fault_size);
+			dev_dax->align, fault_size);
 		return VM_FAULT_SIGBUS;
 	}
 
-	if (fault_size < dax_region->align)
+	if (fault_size < dev_dax->align)
 		return VM_FAULT_SIGBUS;
-	else if (fault_size > dax_region->align)
+	else if (fault_size > dev_dax->align)
 		return VM_FAULT_FALLBACK;
 
 	/* if we are outside of the VMA */
@@ -267,9 +266,8 @@ static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr)
 {
 	struct file *filp = vma->vm_file;
 	struct dev_dax *dev_dax = filp->private_data;
-	struct dax_region *dax_region = dev_dax->region;
 
-	if (!IS_ALIGNED(addr, dax_region->align))
+	if (!IS_ALIGNED(addr, dev_dax->align))
 		return -EINVAL;
 	return 0;
 }
@@ -278,9 +276,8 @@ static unsigned long dev_dax_pagesize(struct vm_area_struct *vma)
 {
 	struct file *filp = vma->vm_file;
 	struct dev_dax *dev_dax = filp->private_data;
-	struct dax_region *dax_region = dev_dax->region;
 
-	return dax_region->align;
+	return dev_dax->align;
 }
 
 static const struct vm_operations_struct dax_vm_ops = {
@@ -319,13 +316,11 @@ static unsigned long dax_get_unmapped_area(struct file *filp,
 {
 	unsigned long off, off_end, off_align, len_align, addr_align, align;
 	struct dev_dax *dev_dax = filp ? filp->private_data : NULL;
-	struct dax_region *dax_region;
 
 	if (!dev_dax || addr)
 		goto out;
 
-	dax_region = dev_dax->region;
-	align = dax_region->align;
+	align = dev_dax->align;
 	off = pgoff << PAGE_SHIFT;
 	off_end = off + len;
 	off_align = round_up(off, align);