mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 06:46:43 +07:00
21aea5cc06
Silence sparse who warns that the global variable is not declared
static.
Fixes: 0b1de5d58e ("drm/i915: Use SSE4.1 movntdqa to ...")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Akash Goel <akash.goel@intel.com>
Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1471432146-5196-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
|
|
* Copyright © 2016 Intel Corporation
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <asm/fpu/api.h>
|
|
|
|
#include "i915_drv.h"
|
|
|
|
static DEFINE_STATIC_KEY_FALSE(has_movntdqa);
|
|
|
|
#ifdef CONFIG_AS_MOVNTDQA
|
|
static void __memcpy_ntdqa(void *dst, const void *src, unsigned long len)
|
|
{
|
|
kernel_fpu_begin();
|
|
|
|
len >>= 4;
|
|
while (len >= 4) {
|
|
asm("movntdqa (%0), %%xmm0\n"
|
|
"movntdqa 16(%0), %%xmm1\n"
|
|
"movntdqa 32(%0), %%xmm2\n"
|
|
"movntdqa 48(%0), %%xmm3\n"
|
|
"movaps %%xmm0, (%1)\n"
|
|
"movaps %%xmm1, 16(%1)\n"
|
|
"movaps %%xmm2, 32(%1)\n"
|
|
"movaps %%xmm3, 48(%1)\n"
|
|
:: "r" (src), "r" (dst) : "memory");
|
|
src += 64;
|
|
dst += 64;
|
|
len -= 4;
|
|
}
|
|
while (len--) {
|
|
asm("movntdqa (%0), %%xmm0\n"
|
|
"movaps %%xmm0, (%1)\n"
|
|
:: "r" (src), "r" (dst) : "memory");
|
|
src += 16;
|
|
dst += 16;
|
|
}
|
|
|
|
kernel_fpu_end();
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* i915_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
|
|
* 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);
|
|
*
|
|
* 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)
|
|
{
|
|
if (unlikely(((unsigned long)dst | (unsigned long)src | len) & 15))
|
|
return false;
|
|
|
|
#ifdef CONFIG_AS_MOVNTDQA
|
|
if (static_branch_likely(&has_movntdqa)) {
|
|
if (likely(len))
|
|
__memcpy_ntdqa(dst, src, len);
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
void i915_memcpy_init_early(struct drm_i915_private *dev_priv)
|
|
{
|
|
if (static_cpu_has(X86_FEATURE_XMM4_1))
|
|
static_branch_enable(&has_movntdqa);
|
|
}
|