Re: [PATCH v4 07/15] drm, drm/i915: Move the memcpy_from_wc functionality to core drm

Am 26.05.21 um 13:32 schrieb Thomas Hellström:

Memcpy from wc will be used as well by TTM memcpy. Move it to core drm, and make the interface do the right thing even on !X86.

Cc: Christian König christian.koenig@amd.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Dave Airlie airlied@gmail.com Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com Reviewed-by: Matthew Auld matthew.auld@intel.com

Acked-by: Christian König christian.koenig@amd.com

---

v4:

• Fix !X86 path (Reported by Matthew Auld)

---

drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_drv.c | 2 + .../drm/{i915/i915_memcpy.c => drm_memcpy.c} | 63 ++++++++++++----- drivers/gpu/drm/i915/Makefile | 1 - .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 4 +- drivers/gpu/drm/i915/gem/i915_gem_object.c | 5 +- drivers/gpu/drm/i915/gt/selftest_reset.c | 7 +- drivers/gpu/drm/i915/gt/uc/intel_guc_log.c | 11 +-- drivers/gpu/drm/i915/i915_cmd_parser.c | 4 +- drivers/gpu/drm/i915/i915_drv.c | 2 - drivers/gpu/drm/i915/i915_gpu_error.c | 8 +-- drivers/gpu/drm/i915/i915_memcpy.h | 34 ---------- .../drm/i915/selftests/intel_memory_region.c | 7 +- include/drm/drm_memcpy.h | 68 +++++++++++++++++++ 14 files changed, 142 insertions(+), 76 deletions(-) rename drivers/gpu/drm/{i915/i915_memcpy.c => drm_memcpy.c} (70%) delete mode 100644 drivers/gpu/drm/i915/i915_memcpy.h create mode 100644 include/drm/drm_memcpy.h

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index a91cc7684904..f3ab8586c3d7 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -18,7 +18,7 @@ drm-y := drm_aperture.o drm_auth.o drm_cache.o \ drm_dumb_buffers.o drm_mode_config.o drm_vblank.o \ drm_syncobj.o drm_lease.o drm_writeback.o drm_client.o \ drm_client_modeset.o drm_atomic_uapi.o drm_hdcp.o \

• drm_managed.o drm_vblank_work.o
  

• drm_managed.o drm_vblank_work.o drm_memcpy.o \
  
  

  drm-$(CONFIG_DRM_LEGACY) += drm_agpsupport.o drm_bufs.o drm_context.o drm_dma.o \ drm_legacy_misc.o drm_lock.o drm_memory.o drm_scatter.o \

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 3d8d68a98b95..351cc2900cf1 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -40,6 +40,7 @@ #include <drm/drm_drv.h> #include <drm/drm_file.h> #include <drm/drm_managed.h> +#include <drm/drm_memcpy.h> #include <drm/drm_mode_object.h> #include <drm/drm_print.h>

@@ -1041,6 +1042,7 @@ static int __init drm_core_init(void)

drm_connector_ida_init(); idr_init(&drm_minors_idr);

• drm_memcpy_init_early();

  ret = drm_sysfs_init(); if (ret < 0) {

diff --git a/drivers/gpu/drm/i915/i915_memcpy.c b/drivers/gpu/drm/drm_memcpy.c similarity index 70% rename from drivers/gpu/drm/i915/i915_memcpy.c rename to drivers/gpu/drm/drm_memcpy.c index 1b021a4902de..740377749caa 100644 --- a/drivers/gpu/drm/i915/i915_memcpy.c +++ b/drivers/gpu/drm/drm_memcpy.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: MIT /*

• Copyright © 2016 Intel Corporation

@@ -22,16 +23,12 @@

*/

+#ifdef CONFIG_X86 +#include <linux/dma-buf-map.h> #include <linux/kernel.h> #include <asm/fpu/api.h>

-#include "i915_memcpy.h"

-#if IS_ENABLED(CONFIG_DRM_I915_DEBUG) -#define CI_BUG_ON(expr) BUG_ON(expr) -#else -#define CI_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr) -#endif +#include "drm/drm_memcpy.h"

static DEFINE_STATIC_KEY_FALSE(has_movntdqa);

@@ -94,23 +91,24 @@ static void __memcpy_ntdqu(void *dst, const void *src, unsigned long len) }

/**

• • i915_memcpy_from_wc: perform an accelerated *aligned* read from WC

• • drm_memcpy_from_wc: perform an accelerated *aligned* read from WC
  • @dst: destination pointer
  • @src: source pointer
  • @len: how many bytes to copy

• • i915_memcpy_from_wc copies @len bytes from @src to @dst using

• • drm_memcpy_from_wc copies @len bytes from @src to @dst using
  • non-temporal instructions where available. Note that all arguments
  • (@src, @dst) must be aligned to 16 bytes and @len must be a multiple
  • of 16.
  • To test whether accelerated reads from WC are supported, use

• • i915_memcpy_from_wc(NULL, NULL, 0);

• • drm_memcpy_from_wc(NULL, NULL, 0);
• • This interface is intended for memremapped memory without the __iomem tag.
  • Returns true if the copy was successful, false if the preconditions
  • are not met.
  */

-bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len) +bool drm_memcpy_from_wc(void *dst, const void *src, unsigned long len) { if (unlikely(((unsigned long)dst | (unsigned long)src | len) & 15)) return false; @@ -123,24 +121,53 @@ bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len)

return false; } +EXPORT_SYMBOL(drm_memcpy_from_wc);

/**

• • i915_unaligned_memcpy_from_wc: perform a mostly accelerated read from WC

• • drm_memcpy_from_wc_dbm: perform an accelerated *aligned* read from WC with
• • struct dma_buf_map arguments.
• • @dst: destination map
• • @src: source map
• • @len: how many bytes to copy
• • This is identical to drm_memcpy_from_wc, except it's intended for
• • potentially ioremapped memory rather than memremapped memory.
• • Returns true if the copy was successful, false if the preconditions
• • are not met.
• */

+bool drm_memcpy_from_wc_dbm(struct dma_buf_map *dst,

• 	    const struct dma_buf_map *src,
  

• 	    unsigned long len)
  

+{

• /* For X86 we can safely drop __iomem */
• return drm_memcpy_from_wc(dst->is_iomem ?

• 		  (void __force *)dst->vaddr_iomem :
  

• 		  dst->vaddr,
  

• 		  src->is_iomem ?
  

• 		  (void const __force *)src->vaddr_iomem :
  

• 		  src->vaddr,
  

• 		  len);
  

+} +EXPORT_SYMBOL(drm_memcpy_from_wc_dbm);

+/**

• • drm_unaligned_memcpy_from_wc: perform a mostly accelerated read from WC
  • @dst: destination pointer
  • @src: source pointer
  • @len: how many bytes to copy

• • Like i915_memcpy_from_wc(), the unaligned variant copies @len bytes from

• • Like drm_memcpy_from_wc(), the unaligned variant copies @len bytes from
  • @src to @dst using * non-temporal instructions where available, but
  • accepts that its arguments may not be aligned, but are valid for the
  • potential 16-byte read past the end.
• • This interface is intended for mremapped memory without the __iomem tag.
  */

-void i915_unaligned_memcpy_from_wc(void *dst, const void *src, unsigned long len) +void drm_unaligned_memcpy_from_wc(void *dst, const void *src, unsigned long len) { unsigned long addr;

• CI_BUG_ON(!i915_has_memcpy_from_wc());
• addr = (unsigned long)src; if (!IS_ALIGNED(addr, 16)) { unsigned long x = min(ALIGN(addr, 16) - addr, len);

@@ -155,8 +182,9 @@ void i915_unaligned_memcpy_from_wc(void *dst, const void *src, unsigned long len if (likely(len)) __memcpy_ntdqu(dst, src, DIV_ROUND_UP(len, 16)); } +EXPORT_SYMBOL(drm_unaligned_memcpy_from_wc);

-void i915_memcpy_init_early(struct drm_i915_private *dev_priv) +void drm_memcpy_init_early(void) { /* * Some hypervisors (e.g. KVM) don't support VEX-prefix instructions @@ -166,3 +194,4 @@ void i915_memcpy_init_early(struct drm_i915_private *dev_priv) !boot_cpu_has(X86_FEATURE_HYPERVISOR)) static_branch_enable(&has_movntdqa); } +#endif diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 4f22cac1c49b..ebc19bd5fff4 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -61,7 +61,6 @@ i915-y += i915_drv.o \ # core library code i915-y += \ dma_resv_utils.o \

• i915_memcpy.o \ i915_mm.o \ i915_sw_fence.o \ i915_sw_fence_work.o \

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 297143511f99..77285e421fb8 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -10,6 +10,7 @@ #include <linux/uaccess.h>

#include <drm/drm_syncobj.h> +#include <drm/drm_memcpy.h>

#include "display/intel_frontbuffer.h"

@@ -28,7 +29,6 @@ #include "i915_sw_fence_work.h" #include "i915_trace.h" #include "i915_user_extensions.h" -#include "i915_memcpy.h"

struct eb_vma { struct i915_vma *vma; @@ -2503,7 +2503,7 @@ static int eb_parse_pipeline(struct i915_execbuffer *eb, !(batch->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ);

pw->batch_map = ERR_PTR(-ENODEV);

• if (needs_clflush && i915_has_memcpy_from_wc())

• if (needs_clflush && drm_has_memcpy_from_wc()) pw->batch_map = i915_gem_object_pin_map(batch, I915_MAP_WC);

  if (IS_ERR(pw->batch_map)) {

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c index 5706d471692d..e9247afb0320 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c @@ -24,6 +24,8 @@

#include <linux/sched/mm.h>

+#include <drm/drm_memcpy.h>

• #include "display/intel_frontbuffer.h" #include "i915_drv.h" #include "i915_gem_clflush.h"

@@ -31,7 +33,6 @@ #include "i915_gem_mman.h" #include "i915_gem_object.h" #include "i915_globals.h" -#include "i915_memcpy.h" #include "i915_trace.h"

static struct i915_global_object { @@ -374,7 +375,7 @@ i915_gem_object_read_from_page_iomap(struct drm_i915_gem_object *obj, u64 offset PAGE_SIZE);

src_ptr = src_map + offset_in_page(offset);

• if (!i915_memcpy_from_wc(dst, (void __force *)src_ptr, size))

• if (!drm_memcpy_from_wc(dst, (void __force *)src_ptr, size)) memcpy_fromio(dst, src_ptr, size);

  io_mapping_unmap(src_map);

diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c b/drivers/gpu/drm/i915/gt/selftest_reset.c index 8784257ec808..92ada67a3835 100644 --- a/drivers/gpu/drm/i915/gt/selftest_reset.c +++ b/drivers/gpu/drm/i915/gt/selftest_reset.c @@ -5,9 +5,10 @@

#include <linux/crc32.h>

+#include <drm/drm_memcpy.h>

• #include "gem/i915_gem_stolen.h"

-#include "i915_memcpy.h" #include "i915_selftest.h" #include "intel_gpu_commands.h" #include "selftests/igt_reset.h" @@ -99,7 +100,7 @@ __igt_reset_stolen(struct intel_gt *gt, memset_io(s, STACK_MAGIC, PAGE_SIZE);

in = (void __force *)s;

• if (i915_memcpy_from_wc(tmp, in, PAGE_SIZE))
  

• if (drm_memcpy_from_wc(tmp, in, PAGE_SIZE))
  in = tmp;
  

  crc[page] = crc32_le(0, in, PAGE_SIZE);

@@ -135,7 +136,7 @@ __igt_reset_stolen(struct intel_gt *gt, PAGE_SIZE);

in = (void __force *)s;

• if (i915_memcpy_from_wc(tmp, in, PAGE_SIZE))
  

• if (drm_memcpy_from_wc(tmp, in, PAGE_SIZE))
  in = tmp;
  

  x = crc32_le(0, in, PAGE_SIZE);

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c index c36d5eb5bbb9..f045e42be6ca 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c @@ -5,9 +5,10 @@

#include <linux/debugfs.h>

+#include <drm/drm_memcpy.h>

• #include "gt/intel_gt.h" #include "i915_drv.h"

-#include "i915_memcpy.h" #include "intel_guc_log.h"

static void guc_log_capture_logs(struct intel_guc_log *log); @@ -295,13 +296,13 @@ static void guc_read_update_log_buffer(struct intel_guc_log *log)

/* Just copy the newly written data */
if (read_offset > write_offset) {

• 	i915_memcpy_from_wc(dst_data, src_data, write_offset);
  

• 	drm_memcpy_from_wc(dst_data, src_data, write_offset);
  bytes_to_copy = buffer_size - read_offset;
  

  } else { bytes_to_copy = write_offset - read_offset; }

• i915_memcpy_from_wc(dst_data + read_offset,
  

• 		    src_data + read_offset, bytes_to_copy);
  

• drm_memcpy_from_wc(dst_data + read_offset,
  

• 		   src_data + read_offset, bytes_to_copy);
  
  

  src_data += buffer_size; dst_data += buffer_size;

@@ -569,7 +570,7 @@ int intel_guc_log_relay_open(struct intel_guc_log *log) * it should be present on the chipsets supporting GuC based * submisssions. */

• if (!i915_has_memcpy_from_wc()) {

• if (!drm_has_memcpy_from_wc()) { ret = -ENXIO; goto out_unlock; }

diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c index 5b4b2bd46e7c..98653f1a2b1d 100644 --- a/drivers/gpu/drm/i915/i915_cmd_parser.c +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c @@ -24,12 +24,12 @@

• Brad Volkin bradley.d.volkin@intel.com

*/ +#include <drm/drm_memcpy.h>

#include "gt/intel_engine.h" #include "gt/intel_gpu_commands.h"

#include "i915_drv.h" -#include "i915_memcpy.h"

/**

• DOC: batch buffer command parser

@@ -1152,7 +1152,7 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,

if (src) { GEM_BUG_ON(!needs_clflush);

• i915_unaligned_memcpy_from_wc(dst, src + offset, length);
  

• drm_unaligned_memcpy_from_wc(dst, src + offset, length);
  

  } else { struct scatterlist *sg; void *ptr;

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 30c349137be2..68639ed0bdec 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -72,7 +72,6 @@ #include "i915_drv.h" #include "i915_ioc32.h" #include "i915_irq.h" -#include "i915_memcpy.h" #include "i915_perf.h" #include "i915_query.h" #include "i915_suspend.h" @@ -325,7 +324,6 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv) mutex_init(&dev_priv->pps_mutex); mutex_init(&dev_priv->hdcp_comp_mutex);

• i915_memcpy_init_early(dev_priv); intel_runtime_pm_init_early(&dev_priv->runtime_pm);

  ret = i915_workqueues_init(dev_priv);

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 8b964e355cb5..7c1b44545bab 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -34,6 +34,7 @@ #include <linux/utsname.h> #include <linux/zlib.h>

+#include <drm/drm_memcpy.h> #include <drm/drm_print.h>

#include "display/intel_dmc.h" @@ -46,7 +47,6 @@

#include "i915_drv.h" #include "i915_gpu_error.h" -#include "i915_memcpy.h" #include "i915_scatterlist.h"

#define ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN) @@ -255,7 +255,7 @@ static bool compress_init(struct i915_vma_compress *c) }

c->tmp = NULL;

• if (i915_has_memcpy_from_wc())

• if (drm_has_memcpy_from_wc()) c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);

  return true;

@@ -295,7 +295,7 @@ static int compress_page(struct i915_vma_compress *c, struct z_stream_s *zstream = &c->zstream;

zstream->next_in = src;

• if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))

• if (wc && c->tmp && drm_memcpy_from_wc(c->tmp, src, PAGE_SIZE)) zstream->next_in = c->tmp; zstream->avail_in = PAGE_SIZE;

@@ -395,7 +395,7 @@ static int compress_page(struct i915_vma_compress *c, if (!ptr) return -ENOMEM;

• if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))

• if (!(wc && drm_memcpy_from_wc(ptr, src, PAGE_SIZE))) memcpy(ptr, src, PAGE_SIZE); dst->pages[dst->page_count++] = ptr; cond_resched();

diff --git a/drivers/gpu/drm/i915/i915_memcpy.h b/drivers/gpu/drm/i915/i915_memcpy.h deleted file mode 100644 index 3df063a3293b..000000000000 --- a/drivers/gpu/drm/i915/i915_memcpy.h +++ /dev/null @@ -1,34 +0,0 @@ -/* SPDX-License-Identifier: MIT */ -/*

• • Copyright © 2019 Intel Corporation
• */

-#ifndef __I915_MEMCPY_H__ -#define __I915_MEMCPY_H__

-#include <linux/types.h>

-struct drm_i915_private;

-void i915_memcpy_init_early(struct drm_i915_private *i915);

-bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len); -void i915_unaligned_memcpy_from_wc(void *dst, const void *src, unsigned long len);

-/* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment,

• • as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot
• • perform the operation. To check beforehand, pass in the parameters to
• • to i915_can_memcpy_from_wc() - since we only care about the low 4 bits,
• • you only need to pass in the minor offsets, page-aligned pointers are
• • always valid.
• • For just checking for SSE4.1, in the foreknowledge that the future use
• • will be correctly aligned, just use i915_has_memcpy_from_wc().
• */

-#define i915_can_memcpy_from_wc(dst, src, len) \

• i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0)

-#define i915_has_memcpy_from_wc() \

• i915_memcpy_from_wc(NULL, NULL, 0)

-#endif /* __I915_MEMCPY_H__ */ diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c index c85d516b85cd..6bb399e9be78 100644 --- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c +++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c @@ -6,6 +6,8 @@ #include <linux/prime_numbers.h> #include <linux/sort.h>

+#include <drm/drm_memcpy.h>

• #include "../i915_selftest.h"

  #include "mock_drm.h"

@@ -20,7 +22,6 @@ #include "gem/selftests/mock_context.h" #include "gt/intel_engine_user.h" #include "gt/intel_gt.h" -#include "i915_memcpy.h" #include "selftests/igt_flush_test.h" #include "selftests/i915_random.h"

@@ -901,7 +902,7 @@ static inline void igt_memcpy(void *dst, const void *src, size_t size)

static inline void igt_memcpy_from_wc(void *dst, const void *src, size_t size) {

• i915_memcpy_from_wc(dst, src, size);

• drm_memcpy_from_wc(dst, src, size); }

  static int _perf_memcpy(struct intel_memory_region *src_mr,

@@ -925,7 +926,7 @@ static int _perf_memcpy(struct intel_memory_region *src_mr, { "memcpy_from_wc", igt_memcpy_from_wc,

• 	!i915_has_memcpy_from_wc(),
  

• 	!drm_has_memcpy_from_wc(),
  

  }, }; struct drm_i915_gem_object *src, *dst;

diff --git a/include/drm/drm_memcpy.h b/include/drm/drm_memcpy.h new file mode 100644 index 000000000000..fe5ed1e89ce6 --- /dev/null +++ b/include/drm/drm_memcpy.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: MIT */ +/*

• • Copyright © 2019 Intel Corporation
• */

+#ifndef __DRM_MEMCPY_H__ +#define __DRM_MEMCPY_H__

+#include <linux/types.h>

+struct dma_buf_map;

+#ifdef CONFIG_X86 +bool drm_memcpy_from_wc(void *dst, const void *src, unsigned long len); +bool drm_memcpy_from_wc_dbm(struct dma_buf_map *dst,

• 	    const struct dma_buf_map *src,
  

• 	    unsigned long len);
  

+void drm_unaligned_memcpy_from_wc(void *dst, const void *src, unsigned long len);

+/* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment,

• • as well as SSE4.1 support. drm_memcpy_from_wc() will report if it cannot
• • perform the operation. To check beforehand, pass in the parameters to
• • drm_can_memcpy_from_wc() - since we only care about the low 4 bits,
• • you only need to pass in the minor offsets, page-aligned pointers are
• • always valid.
• • For just checking for SSE4.1, in the foreknowledge that the future use
• • will be correctly aligned, just use drm_has_memcpy_from_wc().
• */

+#define drm_can_memcpy_from_wc(dst, src, len) \

• drm_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0)

+#define drm_has_memcpy_from_wc() \

• drm_memcpy_from_wc(NULL, NULL, 0)

+void drm_memcpy_init_early(void);

+#else

+static inline +bool drm_memcpy_from_wc(void *dst, const void *src, unsigned long len) +{

• return false;

+}

+static inline +bool drm_memcpy_from_wc_dbm(void *dst, const void *src, unsigned long len) +{

• return false;

+}

+static inline +bool drm_can_memcpy_from_wc_dbm(void *dst, const void *src, unsigned long len) +{

• return false;

+}

+static inline +bool drm_has_memcpy_from_wc(void) +{

• return false;

+}

+#define drm_has_memcpy_from_wc() (false) +#define drm_unaligned_memcpy_from_wc(_dst, _src, _len) WARN_ON(1) +#define drm_memcpy_init_early() do {} while (0) +#endif /* CONFIG_X86 */ +#endif /* __DRM_MEMCPY_H__ */