[Mesa-dev] [PATCH 07/14] anv: FreeBSD support in the allocator

[Jason Ekstrand]

I'm not 100% sure why but GMail has decided that every single e-mail you
send to the mailing list is spam.  You might want to check that out. :)

On Sun, Dec 31, 2017 at 8:55 AM, Greg V <greg at unrelenting.technology> wrote:

> Use umtx for futex, and SHM_ANON for memfd.
>
> Also use temp files as memfd fallback for other OSes.
>
> Obtained from: FreeBSD ports
> ---
>  src/intel/vulkan/anv_allocator.c | 56 ++++++++++++++++++++++++++++++
> ++++++++++
>  1 file changed, 56 insertions(+)
>
> diff --git a/src/intel/vulkan/anv_allocator.c b/src/intel/vulkan/anv_
> allocator.c
> index 33bd3c68c5..c31d3d17d2 100644
> --- a/src/intel/vulkan/anv_allocator.c
> +++ b/src/intel/vulkan/anv_allocator.c
> @@ -25,7 +25,13 @@
>  #include <unistd.h>
>  #include <limits.h>
>  #include <assert.h>
> +#ifdef __linux__
>  #include <linux/memfd.h>
> +#elif __FreeBSD__
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <sys/umtx.h>
> +#endif
>  #include <sys/mman.h>
>
>  #include "anv_private.h"
> @@ -50,6 +56,34 @@
>  #define VG_NOACCESS_WRITE(__ptr, __val) (*(__ptr) = (__val))
>  #endif
>
> +#ifdef __FreeBSD__
> +static inline int
> +sys_futex(void *addr, int op, int32_t val)
> +{
> +   return _umtx_op(addr, op, (uint32_t)val, NULL, NULL) == -1 ? errno : 0;
> +}
> +
> +static inline int
> +futex_wake(uint32_t *addr, int count)
> +{
> +   return sys_futex(addr, UMTX_OP_WAKE, count);
> +}
> +
> +static inline int
> +futex_wait(uint32_t *addr, int32_t value, int32_t _)
> +{
> +   return sys_futex(addr, UMTX_OP_WAIT_UINT, value);
> +}
> +#endif
> +
> +#ifndef MAP_POPULATE
> +#define MAP_POPULATE 0
> +#endif
> +
> +#ifndef MFD_CLOEXEC
> +#define MFD_CLOEXEC O_CLOEXEC
> +#endif
> +
>  /* Design goals:
>   *
>   *  - Lock free (except when resizing underlying bos)
> @@ -113,7 +147,29 @@ struct anv_mmap_cleanup {
>  static inline int
>  memfd_create(const char *name, unsigned int flags)
>  {
> +#if defined(__linux__)
>     return syscall(SYS_memfd_create, name, flags);
> +#elif defined(__FreeBSD__)
> +   return shm_open(SHM_ANON, flags | O_RDWR | O_CREAT, 0600);
> +#else /* DragonFly, NetBSD, OpenBSD, Solaris */
> +   char template[] = "/tmp/shmfd-XXXXXX";
> +#ifdef HAVE_MKOSTEMP
> +   int fd = mkostemp(template, flags);
> +#else
> +   int fd = mkstemp(template);
> +   if (flags & O_CLOEXEC) {
> +     int flags = fcntl(fd, F_GETFD);
> +     if (flags != -1) {
> +       flags |= FD_CLOEXEC;
> +       (void) fcntl(fd, F_SETFD, &flags);
> +     }
> +   }
> +#endif /* HAVE_MKOSTEMP */
> +   if (fd >= 0)
> +     unlink(template);
> +
> +   return fd;
> +#endif /* __linux__ */
>  }
>  #endif
>
> --
> 2.15.1
>
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> mesa-dev at lists.freedesktop.org
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>
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