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-rw-r--r--linux-core/drm_compat.c107
-rw-r--r--linux-core/drm_compat.h16
-rw-r--r--linux-core/drm_vm.c81
3 files changed, 130 insertions, 74 deletions
diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c
index 4825f0c0..23441811 100644
--- a/linux-core/drm_compat.c
+++ b/linux-core/drm_compat.c
@@ -94,6 +94,11 @@ static struct {
} drm_np_retry =
{SPIN_LOCK_UNLOCKED, NOPAGE_OOM, ATOMIC_INIT(0)};
+
+static struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
+ struct fault_data *data);
+
+
struct page * get_nopage_retry(void)
{
if (atomic_read(&drm_np_retry.present) == 0) {
@@ -180,7 +185,7 @@ static int drm_pte_is_clear(struct vm_area_struct *vma,
return ret;
}
-int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
+static int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn)
{
int ret;
@@ -190,14 +195,106 @@ int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
ret = io_remap_pfn_range(vma, addr, pfn, PAGE_SIZE, vma->vm_page_prot);
return ret;
}
+
+static struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
+ struct fault_data *data)
+{
+ unsigned long address = data->address;
+ drm_buffer_object_t *bo = (drm_buffer_object_t *) vma->vm_private_data;
+ unsigned long page_offset;
+ struct page *page = NULL;
+ drm_ttm_t *ttm;
+ drm_device_t *dev;
+ unsigned long pfn;
+ int err;
+ unsigned long bus_base;
+ unsigned long bus_offset;
+ unsigned long bus_size;
+
+
+ mutex_lock(&bo->mutex);
+
+ err = drm_bo_wait(bo, 0, 1, 0);
+ if (err) {
+ data->type = (err == -EAGAIN) ?
+ VM_FAULT_MINOR : VM_FAULT_SIGBUS;
+ goto out_unlock;
+ }
+
+
+ /*
+ * If buffer happens to be in a non-mappable location,
+ * move it to a mappable.
+ */
+
+ if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) {
+ unsigned long _end = jiffies + 3*DRM_HZ;
+ uint32_t new_mask = bo->mem.mask |
+ DRM_BO_FLAG_MAPPABLE |
+ DRM_BO_FLAG_FORCE_MAPPABLE;
+
+ do {
+ err = drm_bo_move_buffer(bo, new_mask, 0, 0);
+ } while((err == -EAGAIN) && !time_after_eq(jiffies, _end));
+
+ if (err) {
+ DRM_ERROR("Timeout moving buffer to mappable location.\n");
+ data->type = VM_FAULT_SIGBUS;
+ goto out_unlock;
+ }
+ }
+
+ if (address > vma->vm_end) {
+ data->type = VM_FAULT_SIGBUS;
+ goto out_unlock;
+ }
+
+ dev = bo->dev;
+ err = drm_bo_pci_offset(dev, &bo->mem, &bus_base, &bus_offset,
+ &bus_size);
+
+ if (err) {
+ data->type = VM_FAULT_SIGBUS;
+ goto out_unlock;
+ }
+
+ page_offset = (address - vma->vm_start) >> PAGE_SHIFT;
+
+ if (bus_size) {
+ drm_mem_type_manager_t *man = &dev->bm.man[bo->mem.mem_type];
+
+ pfn = ((bus_base + bus_offset) >> PAGE_SHIFT) + page_offset;
+ vma->vm_page_prot = drm_io_prot(man->drm_bus_maptype, vma);
+ } else {
+ ttm = bo->ttm;
+
+ drm_ttm_fixup_caching(ttm);
+ page = drm_ttm_get_page(ttm, page_offset);
+ if (!page) {
+ data->type = VM_FAULT_OOM;
+ goto out_unlock;
+ }
+ pfn = page_to_pfn(page);
+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ }
+
+ err = vm_insert_pfn(vma, address, pfn);
+
+ if (!err || err == -EBUSY)
+ data->type = VM_FAULT_MINOR;
+ else
+ data->type = VM_FAULT_OOM;
+out_unlock:
+ mutex_unlock(&bo->mutex);
+ return NULL;
+}
+
#endif
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) && !defined(DRM_FULL_MM_COMPAT))
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)) && \
+ !defined(DRM_FULL_MM_COMPAT)
/**
- * While waiting for the fault() handler to appear in
- * we accomplish approximately
- * the same wrapping it with nopfn.
*/
unsigned long drm_bo_vm_nopfn(struct vm_area_struct * vma,
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index 7741714a..bf5899fb 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -212,19 +212,10 @@ extern void free_nopage_retry(void);
#define NOPAGE_REFAULT get_nopage_retry()
#endif
-#if !defined(DRM_FULL_MM_COMPAT) && \
- ((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)) || \
- (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)))
-struct fault_data;
-extern struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
- struct fault_data *data);
-
-#endif
#ifndef DRM_FULL_MM_COMPAT
/*
- * Hopefully, real NOPAGE_RETRY functionality will be in 2.6.19.
* For now, just return a dummy page that we've allocated out of
* static space. The page will be put by do_nopage() since we've already
* filled out the pte.
@@ -239,15 +230,12 @@ struct fault_data {
int type;
};
-
-extern int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr,
- unsigned long pfn);
-
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
extern struct page *drm_bo_vm_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type);
-#else
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19)) && \
+ !defined(DRM_FULL_MM_COMPAT)
extern unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma,
unsigned long address);
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)) */
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index f3b1088f..a4a55e37 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -718,28 +718,23 @@ EXPORT_SYMBOL(drm_mmap);
* \c Pagefault method for buffer objects.
*
* \param vma Virtual memory area.
- * \param data Fault data on failure or refault.
- * \return Always NULL as we insert pfns directly.
+ * \param address File offset.
+ * \return Error or refault. The pfn is manually inserted.
*
* It's important that pfns are inserted while holding the bo->mutex lock.
* otherwise we might race with unmap_mapping_range() which is always
* called with the bo->mutex lock held.
*
- * It's not pretty to modify the vma->vm_page_prot variable while not
- * holding the mm semaphore in write mode. However, we have it i read mode,
- * so we won't be racing with any other writers, and we only actually modify
- * it when no ptes are present so it shouldn't be a big deal.
+ * We're modifying the page attribute bits of the vma->vm_page_prot field,
+ * without holding the mmap_sem in write mode. Only in read mode.
+ * These bits are not used by the mm subsystem code, and we consider them
+ * protected by the bo->mutex lock.
*/
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19) || \
- LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
#ifdef DRM_FULL_MM_COMPAT
-static
-#endif
-struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
- struct fault_data *data)
+static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma,
+ unsigned long address)
{
- unsigned long address = data->address;
drm_buffer_object_t *bo = (drm_buffer_object_t *) vma->vm_private_data;
unsigned long page_offset;
struct page *page = NULL;
@@ -750,66 +745,43 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
unsigned long bus_base;
unsigned long bus_offset;
unsigned long bus_size;
+ int ret = NOPFN_REFAULT;
-
- mutex_lock(&bo->mutex);
+ if (address > vma->vm_end)
+ return NOPFN_SIGBUS;
+
+ err = mutex_lock_interruptible(&bo->mutex);
+ if (err)
+ return NOPFN_REFAULT;
err = drm_bo_wait(bo, 0, 0, 0);
if (err) {
- data->type = (err == -EAGAIN) ?
- VM_FAULT_MINOR : VM_FAULT_SIGBUS;
+ ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT;
goto out_unlock;
}
-
-
+
/*
* If buffer happens to be in a non-mappable location,
* move it to a mappable.
*/
-#ifdef DRM_BO_FULL_COMPAT
if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) {
uint32_t new_mask = bo->mem.mask |
DRM_BO_FLAG_MAPPABLE |
DRM_BO_FLAG_FORCE_MAPPABLE;
err = drm_bo_move_buffer(bo, new_mask, 0, 0);
-
if (err) {
- data->type = (err == -EAGAIN) ?
- VM_FAULT_MINOR : VM_FAULT_SIGBUS;
+ ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT;
goto out_unlock;
}
}
-#else
- if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) {
- unsigned long _end = jiffies + 3*DRM_HZ;
- uint32_t new_mask = bo->mem.mask |
- DRM_BO_FLAG_MAPPABLE |
- DRM_BO_FLAG_FORCE_MAPPABLE;
-
- do {
- err = drm_bo_move_buffer(bo, new_mask, 0, 0);
- } while((err == -EAGAIN) && !time_after_eq(jiffies, _end));
-
- if (err) {
- DRM_ERROR("Timeout moving buffer to mappable location.\n");
- data->type = VM_FAULT_SIGBUS;
- goto out_unlock;
- }
- }
-#endif
-
- if (address > vma->vm_end) {
- data->type = VM_FAULT_SIGBUS;
- goto out_unlock;
- }
dev = bo->dev;
err = drm_bo_pci_offset(dev, &bo->mem, &bus_base, &bus_offset,
&bus_size);
if (err) {
- data->type = VM_FAULT_SIGBUS;
+ ret = NOPFN_SIGBUS;
goto out_unlock;
}
@@ -826,7 +798,7 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
drm_ttm_fixup_caching(ttm);
page = drm_ttm_get_page(ttm, page_offset);
if (!page) {
- data->type = VM_FAULT_OOM;
+ ret = NOPFN_OOM;
goto out_unlock;
}
pfn = page_to_pfn(page);
@@ -834,14 +806,13 @@ struct page *drm_bo_vm_fault(struct vm_area_struct *vma,
}
err = vm_insert_pfn(vma, address, pfn);
-
- if (!err || err == -EBUSY)
- data->type = VM_FAULT_MINOR;
- else
- data->type = VM_FAULT_OOM;
+ if (err) {
+ ret = (err != -EAGAIN) ? NOPFN_OOM : NOPFN_REFAULT;
+ goto out_unlock;
+ }
out_unlock:
mutex_unlock(&bo->mutex);
- return NULL;
+ return ret;
}
#endif
@@ -897,7 +868,7 @@ static void drm_bo_vm_close(struct vm_area_struct *vma)
static struct vm_operations_struct drm_bo_vm_ops = {
#ifdef DRM_FULL_MM_COMPAT
- .fault = drm_bo_vm_fault,
+ .nopfn = drm_bo_vm_nopfn,
#else
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19))
.nopfn = drm_bo_vm_nopfn,
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 02:45:27 +0000