From: Siva Mullati <siva.mullati@xxxxxxxxx>
Only hw that supports mappable aperture would hit this path
vm_fault_gtt/vm_fault_tmm, So we never hit this function
remap_io_mapping() in discrete, So skip this code for non-x86
architectures.
v2: use IS_ENABLED () instead of #if defined
v3: move function prototypes from i915_drv.h to i915_mm.h
v4: added kernel error message in stub function
v5: fixed compilation warnings
v6: checkpatch style
Signed-off-by: Siva Mullati <siva.mullati@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 1 +
drivers/gpu/drm/i915/i915_drv.h | 8 ------
drivers/gpu/drm/i915/i915_mm.c | 28 +++++++++++--------
drivers/gpu/drm/i915/i915_mm.h | 35 ++++++++++++++++++++++++
4 files changed, 52 insertions(+), 20 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_mm.h
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 65fc6ff5f59d..39bb15eafc07 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -17,6 +17,7 @@
#include "i915_gem_ioctls.h"
#include "i915_gem_object.h"
#include "i915_gem_mman.h"
+#include "i915_mm.h"
#include "i915_trace.h"
#include "i915_user_extensions.h"
#include "i915_gem_ttm.h"
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 85bb8d3107f0..3949cafa59e2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1783,14 +1783,6 @@ mkwrite_device_info(struct drm_i915_private *dev_priv)
int i915_reg_read_ioctl(struct drm_device *dev, void *data,
struct drm_file *file);
-/* i915_mm.c */
-int remap_io_mapping(struct vm_area_struct *vma,
- unsigned long addr, unsigned long pfn, unsigned long size,
- struct io_mapping *iomap);
-int remap_io_sg(struct vm_area_struct *vma,
- unsigned long addr, unsigned long size,
- struct scatterlist *sgl, resource_size_t iobase);
-
static inline int intel_hws_csb_write_index(struct drm_i915_private *i915)
{
if (GRAPHICS_VER(i915) >= 11)
diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c
index 666808cb3a32..7998bc74ab49 100644
--- a/drivers/gpu/drm/i915/i915_mm.c
+++ b/drivers/gpu/drm/i915/i915_mm.c
@@ -27,6 +27,7 @@
#include "i915_drv.h"
+#include "i915_mm.h"
struct remap_pfn {
struct mm_struct *mm;
@@ -37,17 +38,6 @@ struct remap_pfn {
resource_size_t iobase;
};
-static int remap_pfn(pte_t *pte, unsigned long addr, void *data)
-{
- struct remap_pfn *r = data;
-
- /* Special PTE are not associated with any struct page */
- set_pte_at(r->mm, addr, pte, pte_mkspecial(pfn_pte(r->pfn, r->prot)));
- r->pfn++;
-
- return 0;
-}
-
#define use_dma(io) ((io) != -1)
static inline unsigned long sgt_pfn(const struct remap_pfn *r)
@@ -77,6 +67,20 @@ static int remap_sg(pte_t *pte, unsigned long addr, void *data)
return 0;
}
+#define EXPECTED_FLAGS (VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)
+
+#if IS_ENABLED(CONFIG_X86)
+static int remap_pfn(pte_t *pte, unsigned long addr, void *data)
+{
+ struct remap_pfn *r = data;
+
+ /* Special PTE are not associated with any struct page */
+ set_pte_at(r->mm, addr, pte, pte_mkspecial(pfn_pte(r->pfn, r->prot)));
+ r->pfn++;
+
+ return 0;
+}
+
/**
* remap_io_mapping - remap an IO mapping to userspace
* @vma: user vma to map to
@@ -94,7 +98,6 @@ int remap_io_mapping(struct vm_area_struct *vma,
struct remap_pfn r;
int err;
-#define EXPECTED_FLAGS (VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)
GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);
/* We rely on prevalidation of the io-mapping to skip track_pfn(). */
@@ -111,6 +114,7 @@ int remap_io_mapping(struct vm_area_struct *vma,
return 0;
}
+#endif
/**
* remap_io_sg - remap an IO mapping to userspace
diff --git a/drivers/gpu/drm/i915/i915_mm.h b/drivers/gpu/drm/i915/i915_mm.h
new file mode 100644
index 000000000000..76f1d53bdf34
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_mm.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#ifndef __I915_MM_H__
+#define __I915_MM_H__
+
+#include <linux/types.h>
+
+struct vm_area_struct;
+struct io_mapping;
+struct scatterlist;
+
+#if IS_ENABLED(CONFIG_X86)
+int remap_io_mapping(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long pfn, unsigned long size,
+ struct io_mapping *iomap);
+#else
+static inline
+int remap_io_mapping(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long pfn, unsigned long size,
+ struct io_mapping *iomap)
+{
+ pr_err("Architecture has no %s() and shouldn't be calling this function\n", __func__);
+ WARN_ON_ONCE(1);
+ return 0;
+}
+#endif
+
+int remap_io_sg(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long size,
+ struct scatterlist *sgl, resource_size_t iobase);
+
+#endif /* __I915_MM_H__ */
--
2.33.0
