drivers/gpu/drm/img-rogue/mem_utils.c - chromiumos/third_party/kernel - Git at Google

 /*************************************************************************/ /*!
 @File
 @Title          Memory manipulation functions
 @Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
 @Description    Memory related functions
 @License        Dual MIT/GPLv2

 The contents of this file are subject to the MIT license as set out below.

 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 shall be included in
 all copies or substantial portions of the Software.

 Alternatively, the contents of this file may be used under the terms of
 the GNU General Public License Version 2 ("GPL") in which case the provisions
 of GPL are applicable instead of those above.

 If you wish to allow use of your version of this file only under the terms of
 GPL, and not to allow others to use your version of this file under the terms
 of the MIT license, indicate your decision by deleting the provisions above
 and replace them with the notice and other provisions required by GPL as set
 out in the file called "GPL-COPYING" included in this distribution. If you do
 not delete the provisions above, a recipient may use your version of this file
 under the terms of either the MIT license or GPL.

 This License is also included in this distribution in the file called
 "MIT-COPYING".

 EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) 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; AND (B) 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.
 */ /**************************************************************************/

 /* This workaround is only *required* on ARM64. Avoid building or including
  * it by default on other architectures, unless the 'safe memcpy' test flag
  * is enabled. (The code should work on other architectures.)
  */

 #if defined(__arm64__) || defined(__aarch64__) || defined (PVRSRV_DEVMEM_TEST_SAFE_MEMSETCPY)

 /* NOTE: This C file is compiled with -ffreestanding to avoid pattern matching
  *       by the compiler to stdlib functions, and it must only use the below
  *       headers. Do not include any IMG or services headers in this file.
  */
 #include <stddef.h>

 /* Prototypes to suppress warnings in -ffreestanding mode */
 void DeviceMemCopy(void *pvDst, const void *pvSrc, size_t uSize);
 void DeviceMemSet(void *pvDst, unsigned char ui8Value, size_t uSize);

 /* This file is only intended to be used on platforms which use GCC or Clang,
  * due to its requirement on __attribute__((vector_size(n))), typeof() and
  * __SIZEOF__ macros.
  */
 #if defined(__GNUC__)

 #define MIN(a, b) \
  ({__typeof(a) _a = (a); __typeof(b) _b = (b); _a > _b ? _b : _a;})

 #if !defined(DEVICE_MEMSETCPY_ALIGN_IN_BYTES)
 #define DEVICE_MEMSETCPY_ALIGN_IN_BYTES __SIZEOF_LONG__
 #endif
 #if DEVICE_MEMSETCPY_ALIGN_IN_BYTES % 2 != 0
 #error "DEVICE_MEMSETCPY_ALIGN_IN_BYTES must be a power of 2"
 #endif
 #if DEVICE_MEMSETCPY_ALIGN_IN_BYTES < 4
 #error "DEVICE_MEMSETCPY_ALIGN_IN_BYTES must be equal or greater than 4"
 #endif

 #if __SIZEOF_POINTER__ != __SIZEOF_LONG__
 #error No support for architectures where void* and long are sized differently
 #endif

 #if   __SIZEOF_LONG__ >  DEVICE_MEMSETCPY_ALIGN_IN_BYTES
 /* Meaningless, and harder to do correctly */
 # error Cannot handle DEVICE_MEMSETCPY_ALIGN_IN_BYTES < sizeof(long)
 typedef unsigned long block_t;
 #elif __SIZEOF_LONG__ <= DEVICE_MEMSETCPY_ALIGN_IN_BYTES
 typedef unsigned int block_t
 	__attribute__((vector_size(DEVICE_MEMSETCPY_ALIGN_IN_BYTES)));
 # if defined(__arm64__) || defined(__aarch64__)
 #  if   DEVICE_MEMSETCPY_ALIGN_IN_BYTES == 8
 #   define DEVICE_MEMSETCPY_ARM64
 #   define REGSZ "w"
 #   define REGCL "w"
 #   define BVCLB "r"
 #  elif DEVICE_MEMSETCPY_ALIGN_IN_BYTES == 16
 #   define DEVICE_MEMSETCPY_ARM64
 #   define REGSZ "x"
 #   define REGCL "x"
 #   define BVCLB "r"
 #  elif DEVICE_MEMSETCPY_ALIGN_IN_BYTES == 32
 #   if defined(__ARM_NEON_FP)
 #    define DEVICE_MEMSETCPY_ARM64
 #    define REGSZ "q"
 #    define REGCL "v"
 #    define BVCLB "w"
 #   endif
 #  endif
 #  if defined(DEVICE_MEMSETCPY_ARM64)
 #   if defined(DEVICE_MEMSETCPY_ARM64_NON_TEMPORAL)
 #    define NSHLD() __asm__ ("dmb nshld")
 #    define NSHST() __asm__ ("dmb nshst")
 #    define LDP "ldnp"
 #    define STP "stnp"
 #   else
 #    define NSHLD()
 #    define NSHST()
 #    define LDP "ldp"
 #    define STP "stp"
 #   endif
  typedef unsigned int block_half_t
 	__attribute__((vector_size(DEVICE_MEMSETCPY_ALIGN_IN_BYTES / 2)));
 #  endif
 # endif
 #endif

 __attribute__((visibility("hidden")))
 void DeviceMemCopy(void *pvDst, const void *pvSrc, size_t uSize)
 {
 	volatile const char *pcSrc = pvSrc;
 	volatile char *pcDst = pvDst;
 	size_t uPreambleBytes;
 	int bBlockCopy = 0;

 	size_t uSrcUnaligned = (size_t)pcSrc % sizeof(block_t);
 	size_t uDstUnaligned = (size_t)pcDst % sizeof(block_t);

 	if (!uSrcUnaligned && !uDstUnaligned)
 	{
 		/* Neither pointer is unaligned. Optimal case. */
 		bBlockCopy = 1;
 	}
 	else
 	{
 		if (uSrcUnaligned == uDstUnaligned)
 		{
 			/* Neither pointer is usefully aligned, but they are misaligned in
 			 * the same way, so we can copy a preamble in a slow way, then
 			 * optimize the rest.
 			 */
 			uPreambleBytes = MIN(sizeof(block_t) - uDstUnaligned, uSize);
 			uSize -= uPreambleBytes;
 			while (uPreambleBytes)
 			{
 				*pcDst++ = *pcSrc++;
 				uPreambleBytes--;
 			}

 			bBlockCopy = 1;
 		}
 		else if ((uSrcUnaligned | uDstUnaligned) % sizeof(int) == 0)
 		{
 			/* Both pointers are at least 32-bit aligned, and we assume that
 			 * the processor must handle all kinds of 32-bit load-stores.
 			 * NOTE: Could we optimize this with a non-temporal version?
 			 */
 			if (uSize >= sizeof(int))
 			{
 				volatile int *piSrc = (int *)pcSrc;
 				volatile int *piDst = (int *)pcDst;

 				while (uSize >= sizeof(int))
 				{
 					*piDst++ = *piSrc++;
 					uSize -= sizeof(int);
 				}

 				pcSrc = (char *)piSrc;
 				pcDst = (char *)piDst;
 			}
 		}
 	}

 	if (bBlockCopy && uSize >= sizeof(block_t))
 	{
 		volatile block_t *pSrc = (block_t *)pcSrc;
 		volatile block_t *pDst = (block_t *)pcDst;

 		NSHLD();

 		while (uSize >= sizeof(block_t))
 		{
 #if defined(DEVICE_MEMSETCPY_ARM64)
 			__asm__ (LDP " " REGSZ "0, " REGSZ "1, [%[pSrc]]\n\t"
 			         STP " " REGSZ "0, " REGSZ "1, [%[pDst]]"
 						:
 						: [pSrc] "r" (pSrc), [pDst] "r" (pDst)
 						: "memory", REGCL "0", REGCL "1");
 #else
 			*pDst = *pSrc;
 #endif
 			pDst++;
 			pSrc++;
 			uSize -= sizeof(block_t);
 		}

 		NSHST();

 		pcSrc = (char *)pSrc;
 		pcDst = (char *)pDst;
 	}

 	while (uSize)
 	{
 		*pcDst++ = *pcSrc++;
 		uSize--;
 	}
 }

 __attribute__((visibility("hidden")))
 void DeviceMemSet(void *pvDst, unsigned char ui8Value, size_t uSize)
 {
 	volatile char *pcDst = pvDst;
 	size_t uPreambleBytes;

 	size_t uDstUnaligned = (size_t)pcDst % sizeof(block_t);

 	if (uDstUnaligned)
 	{
 		uPreambleBytes = MIN(sizeof(block_t) - uDstUnaligned, uSize);
 		uSize -= uPreambleBytes;
 		while (uPreambleBytes)
 		{
 			*pcDst++ = ui8Value;
 			uPreambleBytes--;
 		}
 	}

 	if (uSize >= sizeof(block_t))
 	{
 		volatile block_t *pDst = (block_t *)pcDst;
 #if defined(DEVICE_MEMSETCPY_ARM64)
 		block_half_t bValue;
 #else
 		block_t bValue;
 # endif
 		size_t i;

 		for (i = 0; i < sizeof(bValue) / sizeof(unsigned int); i++)
 			bValue[i] = ui8Value << 24U |
 			            ui8Value << 16U |
 			            ui8Value <<  8U |
 			            ui8Value;

 		NSHLD();

 		while (uSize >= sizeof(block_t))
 		{
 #if defined(DEVICE_MEMSETCPY_ARM64)
 			__asm__ (STP " %" REGSZ "[bValue], %" REGSZ "[bValue], [%[pDst]]"
 						:
 						: [bValue] BVCLB (bValue), [pDst] "r" (pDst)
 						: "memory");
 #else
 			*pDst = bValue;
 #endif
 			pDst++;
 			uSize -= sizeof(block_t);
 		}

 		NSHST();

 		pcDst = (char *)pDst;
 	}

 	while (uSize)
 	{
 		*pcDst++ = ui8Value;
 		uSize--;
 	}
 }

 #else /* !defined(__GNUC__) */

 /* Potentially very slow (but safe) fallbacks for non-GNU C compilers */

 void DeviceMemCopy(void *pvDst, const void *pvSrc, size_t uSize)
 {
 	volatile const char *pcSrc = pvSrc;
 	volatile char *pcDst = pvDst;

 	while (uSize)
 	{
 		*pcDst++ = *pcSrc++;
 		uSize--;
 	}
 }

 void DeviceMemSet(void *pvDst, unsigned char ui8Value, size_t uSize)
 {
 	volatile char *pcDst = pvDst;

 	while (uSize)
 	{
 		*pcDst++ = ui8Value;
 		uSize--;
 	}
 }

 #endif /* !defined(__GNUC__) */

 #endif /* defined(__arm64__) || defined(__aarch64__) || defined (PVRSRV_DEVMEM_TEST_SAFE_MEMSETCPY) */
	/************************************************************************/ /!
	@File
	@Title Memory manipulation functions
	@Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
	@Description Memory related functions
	@License Dual MIT/GPLv2

	The contents of this file are subject to the MIT license as set out below.

	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 shall be included in
	all copies or substantial portions of the Software.

	Alternatively, the contents of this file may be used under the terms of
	the GNU General Public License Version 2 ("GPL") in which case the provisions
	of GPL are applicable instead of those above.

	If you wish to allow use of your version of this file only under the terms of
	GPL, and not to allow others to use your version of this file under the terms
	of the MIT license, indicate your decision by deleting the provisions above
	and replace them with the notice and other provisions required by GPL as set
	out in the file called "GPL-COPYING" included in this distribution. If you do
	not delete the provisions above, a recipient may use your version of this file
	under the terms of either the MIT license or GPL.

	This License is also included in this distribution in the file called
	"MIT-COPYING".

	EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) 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; AND (B) 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.
	/ /*************************************************************************/

	/* This workaround is only required on ARM64. Avoid building or including
	* it by default on other architectures, unless the 'safe memcpy' test flag
	* is enabled. (The code should work on other architectures.)
	*/

	#if defined(__arm64__) \|\| defined(__aarch64__) \|\| defined (PVRSRV_DEVMEM_TEST_SAFE_MEMSETCPY)

	/* NOTE: This C file is compiled with -ffreestanding to avoid pattern matching
	* by the compiler to stdlib functions, and it must only use the below
	* headers. Do not include any IMG or services headers in this file.
	*/
	#include <stddef.h>

	/* Prototypes to suppress warnings in -ffreestanding mode */
	void DeviceMemCopy(void pvDst, const void pvSrc, size_t uSize);
	void DeviceMemSet(void *pvDst, unsigned char ui8Value, size_t uSize);

	/* This file is only intended to be used on platforms which use GCC or Clang,
	* due to its requirement on __attribute__((vector_size(n))), typeof() and
	* __SIZEOF__ macros.
	*/
	#if defined(__GNUC__)

	#define MIN(a, b) \
	({__typeof(a) _a = (a); __typeof(b) _b = (b); _a > _b ? _b : _a;})

	#if !defined(DEVICE_MEMSETCPY_ALIGN_IN_BYTES)
	#define DEVICE_MEMSETCPY_ALIGN_IN_BYTES __SIZEOF_LONG__
	#endif
	#if DEVICE_MEMSETCPY_ALIGN_IN_BYTES % 2 != 0
	#error "DEVICE_MEMSETCPY_ALIGN_IN_BYTES must be a power of 2"
	#endif
	#if DEVICE_MEMSETCPY_ALIGN_IN_BYTES < 4
	#error "DEVICE_MEMSETCPY_ALIGN_IN_BYTES must be equal or greater than 4"
	#endif

	#if __SIZEOF_POINTER__ != __SIZEOF_LONG__
	#error No support for architectures where void* and long are sized differently
	#endif

	#if __SIZEOF_LONG__ > DEVICE_MEMSETCPY_ALIGN_IN_BYTES
	/* Meaningless, and harder to do correctly */
	# error Cannot handle DEVICE_MEMSETCPY_ALIGN_IN_BYTES < sizeof(long)
	typedef unsigned long block_t;
	#elif __SIZEOF_LONG__ <= DEVICE_MEMSETCPY_ALIGN_IN_BYTES
	typedef unsigned int block_t
	__attribute__((vector_size(DEVICE_MEMSETCPY_ALIGN_IN_BYTES)));
	# if defined(__arm64__) \|\| defined(__aarch64__)
	# if DEVICE_MEMSETCPY_ALIGN_IN_BYTES == 8
	# define DEVICE_MEMSETCPY_ARM64
	# define REGSZ "w"
	# define REGCL "w"
	# define BVCLB "r"
	# elif DEVICE_MEMSETCPY_ALIGN_IN_BYTES == 16
	# define DEVICE_MEMSETCPY_ARM64
	# define REGSZ "x"
	# define REGCL "x"
	# define BVCLB "r"
	# elif DEVICE_MEMSETCPY_ALIGN_IN_BYTES == 32
	# if defined(__ARM_NEON_FP)
	# define DEVICE_MEMSETCPY_ARM64
	# define REGSZ "q"
	# define REGCL "v"
	# define BVCLB "w"
	# endif
	# endif
	# if defined(DEVICE_MEMSETCPY_ARM64)
	# if defined(DEVICE_MEMSETCPY_ARM64_NON_TEMPORAL)
	# define NSHLD() __asm__ ("dmb nshld")
	# define NSHST() __asm__ ("dmb nshst")
	# define LDP "ldnp"
	# define STP "stnp"
	# else
	# define NSHLD()
	# define NSHST()
	# define LDP "ldp"
	# define STP "stp"
	# endif
	typedef unsigned int block_half_t
	__attribute__((vector_size(DEVICE_MEMSETCPY_ALIGN_IN_BYTES / 2)));
	# endif
	# endif
	#endif

	__attribute__((visibility("hidden")))
	void DeviceMemCopy(void pvDst, const void pvSrc, size_t uSize)
	{
	volatile const char *pcSrc = pvSrc;
	volatile char *pcDst = pvDst;
	size_t uPreambleBytes;
	int bBlockCopy = 0;

	size_t uSrcUnaligned = (size_t)pcSrc % sizeof(block_t);
	size_t uDstUnaligned = (size_t)pcDst % sizeof(block_t);

	if (!uSrcUnaligned && !uDstUnaligned)
	{
	/* Neither pointer is unaligned. Optimal case. */
	bBlockCopy = 1;
	}
	else
	{
	if (uSrcUnaligned == uDstUnaligned)
	{
	/* Neither pointer is usefully aligned, but they are misaligned in
	* the same way, so we can copy a preamble in a slow way, then
	* optimize the rest.
	*/
	uPreambleBytes = MIN(sizeof(block_t) - uDstUnaligned, uSize);
	uSize -= uPreambleBytes;
	while (uPreambleBytes)
	{
	pcDst++ = pcSrc++;
	uPreambleBytes--;
	}

	bBlockCopy = 1;
	}
	else if ((uSrcUnaligned \| uDstUnaligned) % sizeof(int) == 0)
	{
	/* Both pointers are at least 32-bit aligned, and we assume that
	* the processor must handle all kinds of 32-bit load-stores.
	* NOTE: Could we optimize this with a non-temporal version?
	*/
	if (uSize >= sizeof(int))
	{
	volatile int piSrc = (int )pcSrc;
	volatile int piDst = (int )pcDst;

	while (uSize >= sizeof(int))
	{
	piDst++ = piSrc++;
	uSize -= sizeof(int);
	}

	pcSrc = (char *)piSrc;
	pcDst = (char *)piDst;
	}
	}
	}

	if (bBlockCopy && uSize >= sizeof(block_t))
	{
	volatile block_t pSrc = (block_t )pcSrc;
	volatile block_t pDst = (block_t )pcDst;

	NSHLD();

	while (uSize >= sizeof(block_t))
	{
	#if defined(DEVICE_MEMSETCPY_ARM64)
	__asm__ (LDP " " REGSZ "0, " REGSZ "1, [%[pSrc]]\n\t"
	STP " " REGSZ "0, " REGSZ "1, [%[pDst]]"
	:
	: [pSrc] "r" (pSrc), [pDst] "r" (pDst)
	: "memory", REGCL "0", REGCL "1");
	#else
	pDst = pSrc;
	#endif
	pDst++;
	pSrc++;
	uSize -= sizeof(block_t);
	}

	NSHST();

	pcSrc = (char *)pSrc;
	pcDst = (char *)pDst;
	}

	while (uSize)
	{
	pcDst++ = pcSrc++;
	uSize--;
	}
	}

	__attribute__((visibility("hidden")))
	void DeviceMemSet(void *pvDst, unsigned char ui8Value, size_t uSize)
	{
	volatile char *pcDst = pvDst;
	size_t uPreambleBytes;

	size_t uDstUnaligned = (size_t)pcDst % sizeof(block_t);

	if (uDstUnaligned)
	{
	uPreambleBytes = MIN(sizeof(block_t) - uDstUnaligned, uSize);
	uSize -= uPreambleBytes;
	while (uPreambleBytes)
	{
	*pcDst++ = ui8Value;
	uPreambleBytes--;
	}
	}

	if (uSize >= sizeof(block_t))
	{
	volatile block_t pDst = (block_t )pcDst;
	#if defined(DEVICE_MEMSETCPY_ARM64)
	block_half_t bValue;
	#else
	block_t bValue;
	# endif
	size_t i;

	for (i = 0; i < sizeof(bValue) / sizeof(unsigned int); i++)
	bValue[i] = ui8Value << 24U \|
	ui8Value << 16U \|
	ui8Value << 8U \|
	ui8Value;

	NSHLD();

	while (uSize >= sizeof(block_t))
	{
	#if defined(DEVICE_MEMSETCPY_ARM64)
	__asm__ (STP " %" REGSZ "[bValue], %" REGSZ "[bValue], [%[pDst]]"
	:
	: [bValue] BVCLB (bValue), [pDst] "r" (pDst)
	: "memory");
	#else
	*pDst = bValue;
	#endif
	pDst++;
	uSize -= sizeof(block_t);
	}

	NSHST();

	pcDst = (char *)pDst;
	}

	while (uSize)
	{
	*pcDst++ = ui8Value;
	uSize--;
	}
	}

	#else /* !defined(__GNUC__) */

	/* Potentially very slow (but safe) fallbacks for non-GNU C compilers */

	void DeviceMemCopy(void pvDst, const void pvSrc, size_t uSize)
	{
	volatile const char *pcSrc = pvSrc;
	volatile char *pcDst = pvDst;

	while (uSize)
	{
	pcDst++ = pcSrc++;
	uSize--;
	}
	}

	void DeviceMemSet(void *pvDst, unsigned char ui8Value, size_t uSize)
	{
	volatile char *pcDst = pvDst;

	while (uSize)
	{
	*pcDst++ = ui8Value;
	uSize--;
	}
	}

	#endif /* !defined(__GNUC__) */

	#endif /* defined(__arm64__) \|\| defined(__aarch64__) \|\| defined (PVRSRV_DEVMEM_TEST_SAFE_MEMSETCPY) */