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Subject[PATCH] gpu: drm: msm: Change return type to vm_fault_t
Use new return type vm_fault_t for fault handler. For
now, this is just documenting that the function returns
a VM_FAULT value rather than an errno. Once all instances
are converted, vm_fault_t will become a distinct type.

Ref- commit 1c8f422059ae ("mm: change return type to vm_fault_t")

Previously vm_insert_mixed() returns err which driver
mapped into VM_FAULT_* type. The new function
vmf_insert_mixed() will replace this inefficiency by
returning VM_FAULT_* type.

vmf_error() is the newly introduce inline function
in 4.17-rc6.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
---
drivers/gpu/drm/msm/msm_drv.h | 3 ++-
drivers/gpu/drm/msm/msm_gem.c | 33 ++++++++++-----------------------
2 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 0a653dd..44b4ca7 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -33,6 +33,7 @@
#include <linux/of_graph.h>
#include <linux/of_device.h>
#include <asm/sizes.h>
+#include <linux/mm_types.h>

#include <drm/drmP.h>
#include <drm/drm_atomic.h>
@@ -188,7 +189,7 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
int msm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma);
int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
-int msm_gem_fault(struct vm_fault *vmf);
+vm_fault_t msm_gem_fault(struct vm_fault *vmf);
uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
int msm_gem_get_iova(struct drm_gem_object *obj,
struct msm_gem_address_space *aspace, uint64_t *iova);
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 07376de..27a5ab5 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -217,7 +217,7 @@ int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
return msm_gem_mmap_obj(vma->vm_private_data, vma);
}

-int msm_gem_fault(struct vm_fault *vmf)
+vm_fault_t msm_gem_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct drm_gem_object *obj = vma->vm_private_data;
@@ -225,15 +225,18 @@ int msm_gem_fault(struct vm_fault *vmf)
struct page **pages;
unsigned long pfn;
pgoff_t pgoff;
- int ret;
+ int err;
+ vm_fault_t ret;

/*
* vm_ops.open/drm_gem_mmap_obj and close get and put
* a reference on obj. So, we dont need to hold one here.
*/
- ret = mutex_lock_interruptible(&msm_obj->lock);
- if (ret)
+ err = mutex_lock_interruptible(&msm_obj->lock);
+ if (err) {
+ ret = VM_FAULT_NOPAGE;
goto out;
+ }

if (WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
mutex_unlock(&msm_obj->lock);
@@ -243,7 +246,7 @@ int msm_gem_fault(struct vm_fault *vmf)
/* make sure we have pages attached now */
pages = get_pages(obj);
if (IS_ERR(pages)) {
- ret = PTR_ERR(pages);
+ ret = vmf_error(PTR_ERR(pages));
goto out_unlock;
}

@@ -255,27 +258,11 @@ int msm_gem_fault(struct vm_fault *vmf)
VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
pfn, pfn << PAGE_SHIFT);

- ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
-
+ ret = vmf_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
out_unlock:
mutex_unlock(&msm_obj->lock);
out:
- switch (ret) {
- case -EAGAIN:
- case 0:
- case -ERESTARTSYS:
- case -EINTR:
- case -EBUSY:
- /*
- * EBUSY is ok: this just means that another thread
- * already did the job.
- */
- return VM_FAULT_NOPAGE;
- case -ENOMEM:
- return VM_FAULT_OOM;
- default:
- return VM_FAULT_SIGBUS;
- }
+ return ret;
}

/** get mmap offset */
--
1.9.1
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