diff options
Diffstat (limited to 'lib/gem_msm.c')
-rw-r--r-- | lib/gem_msm.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/lib/gem_msm.c b/lib/gem_msm.c new file mode 100644 index 00000000..2160f443 --- /dev/null +++ b/lib/gem_msm.c @@ -0,0 +1,68 @@ +#include "gem_msm.h" +#include "drm-uapi/msm_drm.h" + +#include "drm.h" + +static int gem_msm_mmap(void **ptr, int drm_fd, uint32_t gem_handle, size_t size) +{ + struct drm_msm_gem_cpu_prep gem_prep = { + .handle = gem_handle, + .op = MSM_PREP_READ, + .timeout = { .tv_sec = 1, .tv_nsec = 0 } + }; + + if (drmIoctl(drm_fd, DRM_IOCTL_MSM_GEM_CPU_PREP, &gem_prep)) + { + return -1; + } + + struct drm_msm_gem_info gem_info = { + .handle = gem_handle, + .flags = 0, + .offset = 0 + }; + + if (drmIoctl(drm_fd, DRM_IOCTL_MSM_GEM_INFO, &gem_info)) + { + return -1; + } + + void *const k_addr = 0; + const int k_prot = PROT_READ | PROT_WRITE; + const int k_flags = MAP_SHARED; + + void *ret = mmap(k_addr, size, k_prot, k_flags, drm_fd, gem_info.offset); + + if (ret == MAP_FAILED) + { + return -1; + } + + *ptr = ret; + + return 0; +} + +static int gem_msm_munmap(int drm_fd, uint32_t gem_handle, void *ptr, size_t size) +{ + if (munmap(ptr, size)) + { + return -1; + } + + struct drm_msm_gem_cpu_fini gem_fini = { + .handle = gem_handle + }; + + if (drmIoctl(drm_fd, DRM_IOCTL_MSM_GEM_CPU_FINI, &gem_fini)) + { + return -1; + } + + return 0; +} + +struct gem_driver gem_msm_driver = { + .mmap = gem_msm_mmap, + .munmap = gem_msm_munmap +}; |