diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 77 |
1 files changed, 53 insertions, 24 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c index d4ab27bf8d04..33807d746e76 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c @@ -34,6 +34,19 @@ #endif /** + * DOC: DC FPU manipulation overview + * + * DC core uses FPU operations in multiple parts of the code, which requires a + * more specialized way to manage these areas' entrance. To fulfill this + * requirement, we created some wrapper functions that encapsulate + * kernel_fpu_begin/end to better fit our need in the display component. In + * summary, in this file, you can find functions related to FPU operation + * management. + */ + +static DEFINE_PER_CPU(int, fpu_recursion_depth); + +/** * dc_fpu_begin - Enables FPU protection * @function_name: A string containing the function name for debug purposes * (usually __func__) @@ -48,22 +61,30 @@ */ void dc_fpu_begin(const char *function_name, const int line) { - TRACE_DCN_FPU(true, function_name, line); + int *pcpu; + + pcpu = get_cpu_ptr(&fpu_recursion_depth); + *pcpu += 1; + if (*pcpu == 1) { #if defined(CONFIG_X86) - kernel_fpu_begin(); + kernel_fpu_begin(); #elif defined(CONFIG_PPC64) - if (cpu_has_feature(CPU_FTR_VSX_COMP)) { - preempt_disable(); - enable_kernel_vsx(); - } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) { - preempt_disable(); - enable_kernel_altivec(); - } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) { - preempt_disable(); - enable_kernel_fp(); - } + if (cpu_has_feature(CPU_FTR_VSX_COMP)) { + preempt_disable(); + enable_kernel_vsx(); + } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) { + preempt_disable(); + enable_kernel_altivec(); + } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) { + preempt_disable(); + enable_kernel_fp(); + } #endif + } + + TRACE_DCN_FPU(true, function_name, line, *pcpu); + put_cpu_ptr(&fpu_recursion_depth); } /** @@ -78,19 +99,27 @@ void dc_fpu_begin(const char *function_name, const int line) */ void dc_fpu_end(const char *function_name, const int line) { - TRACE_DCN_FPU(false, function_name, line); + int *pcpu; + + pcpu = get_cpu_ptr(&fpu_recursion_depth); + *pcpu -= 1; + if (*pcpu <= 0) { #if defined(CONFIG_X86) - kernel_fpu_end(); + kernel_fpu_end(); #elif defined(CONFIG_PPC64) - if (cpu_has_feature(CPU_FTR_VSX_COMP)) { - disable_kernel_vsx(); - preempt_enable(); - } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) { - disable_kernel_altivec(); - preempt_enable(); - } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) { - disable_kernel_fp(); - preempt_enable(); - } + if (cpu_has_feature(CPU_FTR_VSX_COMP)) { + disable_kernel_vsx(); + preempt_enable(); + } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) { + disable_kernel_altivec(); + preempt_enable(); + } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) { + disable_kernel_fp(); + preempt_enable(); + } #endif + } + + TRACE_DCN_FPU(false, function_name, line, *pcpu); + put_cpu_ptr(&fpu_recursion_depth); } |