[PATCH 1/2] drm/i915: Add lmem fault handler
Abdiel Janulgue
abdiel.janulgue at linux.intel.com
Thu Dec 19 04:25:38 UTC 2019
Fault handler to handle missing pages for lmem objects.
v4: Restore noncontiguous fault handling in addition to remap_io_mapping
Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_lmem.c | 13 +++++
drivers/gpu/drm/i915/gem/i915_gem_lmem.h | 4 ++
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 71 ++++++++++++++++++++++--
3 files changed, 84 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
index 520cc9cac471..e8326d8b66f7 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
@@ -6,6 +6,7 @@
#include "intel_memory_region.h"
#include "gem/i915_gem_region.h"
#include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_mman.h"
#include "i915_drv.h"
const struct drm_i915_gem_object_ops i915_gem_lmem_obj_ops = {
@@ -56,6 +57,18 @@ i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
return io_mapping_map_wc(&obj->mm.region->iomap, offset, size);
}
+unsigned long i915_gem_object_lmem_io_pfn(struct drm_i915_gem_object *obj,
+ unsigned long n)
+{
+ struct intel_memory_region *mem = obj->mm.region;
+ resource_size_t offset;
+
+ offset = i915_gem_object_get_dma_address(obj, n);
+ offset -= mem->region.start;
+
+ return (mem->io_start + offset) >> PAGE_SHIFT;
+}
+
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
{
return obj->ops == &i915_gem_lmem_obj_ops;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
index 7c176b8b7d2f..4d5fca1a3e0e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
@@ -7,6 +7,7 @@
#define __I915_GEM_LMEM_H
#include <linux/types.h>
+#include <linux/mman.h>
struct drm_i915_private;
struct drm_i915_gem_object;
@@ -22,6 +23,9 @@ void __iomem *
i915_gem_object_lmem_io_map_page_atomic(struct drm_i915_gem_object *obj,
unsigned long n);
+unsigned long i915_gem_object_lmem_io_pfn(struct drm_i915_gem_object *obj,
+ unsigned long n);
+
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj);
struct drm_i915_gem_object *
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 879fff8adc48..f5f7af745d1d 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -11,6 +11,7 @@
#include "gt/intel_gt.h"
#include "gt/intel_gt_requests.h"
+#include "i915_gem_lmem.h"
#include "i915_drv.h"
#include "i915_gem_gtt.h"
#include "i915_gem_ioctls.h"
@@ -216,6 +217,7 @@ static vm_fault_t i915_error_to_vmf_fault(int err)
case -ENOSPC: /* shmemfs allocation failure */
case -ENOMEM: /* our allocation failure */
+ case -ENXIO:
return VM_FAULT_OOM;
case 0:
@@ -274,6 +276,47 @@ static vm_fault_t vm_fault_cpu(struct vm_fault *vmf)
return ret;
}
+vm_fault_t vm_fault_iomem(struct vm_fault *vmf)
+{
+ struct vm_area_struct *area = vmf->vma;
+ struct i915_mmap_offset *priv = area->vm_private_data;
+ struct drm_i915_gem_object *obj = priv->obj;
+ struct intel_memory_region *mem = obj->mm.region;
+ unsigned long i, size = area->vm_end - area->vm_start;
+ bool write = area->vm_flags & VM_WRITE;
+ int ret;
+
+ /* Sanity check that we allow writing into this object */
+ if (i915_gem_object_is_readonly(obj) && write)
+ return VM_FAULT_SIGBUS;
+
+ ret = i915_gem_object_pin_pages(obj);
+ if (ret)
+ return i915_error_to_vmf_fault(ret);
+
+ if (obj->flags & I915_BO_ALLOC_CONTIGUOUS) {
+ ret = remap_io_mapping(area, area->vm_start,
+ i915_gem_object_lmem_io_pfn(obj, 0), size,
+ &mem->iomap);
+ i915_gem_object_unpin_pages(obj);
+ return i915_error_to_vmf_fault(ret);
+ } else {
+ vm_fault_t vmf_ret = VM_FAULT_SIGBUS;
+ if (GEM_WARN_ON(size < PAGE_SIZE))
+ return vmf_ret;
+
+ for (i = 0; i < size >> PAGE_SHIFT; i++) {
+ vmf_ret = vmf_insert_pfn(area,
+ (unsigned long)area->vm_start + i * PAGE_SIZE,
+ i915_gem_object_lmem_io_pfn(obj, i));
+ if (vmf_ret != VM_FAULT_NOPAGE)
+ break;
+ }
+ i915_gem_object_unpin_pages(obj);
+ return vmf_ret;
+ }
+}
+
static vm_fault_t vm_fault_gtt(struct vm_fault *vmf)
{
#define MIN_CHUNK_PAGES (SZ_1M >> PAGE_SHIFT)
@@ -560,7 +603,8 @@ __assign_mmap_offset(struct drm_file *file,
}
if (mmap_type != I915_MMAP_TYPE_GTT &&
- !i915_gem_object_has_struct_page(obj)) {
+ !i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_STRUCT_PAGE |
+ I915_GEM_OBJECT_HAS_IOMEM)) {
err = -ENODEV;
goto out;
}
@@ -694,6 +738,25 @@ static const struct vm_operations_struct vm_ops_cpu = {
.close = vm_close,
};
+static const struct vm_operations_struct vm_ops_iomem = {
+ .fault = vm_fault_iomem,
+ .open = vm_open,
+ .close = vm_close,
+};
+
+static const struct vm_operations_struct *
+get_vm_cpu_ops(struct drm_i915_gem_object *obj)
+{
+ if (i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_STRUCT_PAGE))
+ return &vm_ops_cpu;
+
+ if (i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM))
+ return &vm_ops_iomem;
+
+ GEM_BUG_ON("unknown object type");
+ return NULL;
+}
+
/*
* This overcomes the limitation in drm_gem_mmap's assignment of a
* drm_gem_object as the vma->vm_private_data. Since we need to
@@ -762,18 +825,18 @@ int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
case I915_MMAP_TYPE_WC:
vma->vm_page_prot =
pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
- vma->vm_ops = &vm_ops_cpu;
+ vma->vm_ops = get_vm_cpu_ops(to_intel_bo(obj));
break;
case I915_MMAP_TYPE_WB:
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
- vma->vm_ops = &vm_ops_cpu;
+ vma->vm_ops = get_vm_cpu_ops(to_intel_bo(obj));
break;
case I915_MMAP_TYPE_UC:
vma->vm_page_prot =
pgprot_noncached(vm_get_page_prot(vma->vm_flags));
- vma->vm_ops = &vm_ops_cpu;
+ vma->vm_ops = get_vm_cpu_ops(to_intel_bo(obj));
break;
case I915_MMAP_TYPE_GTT:
--
2.23.0
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