[ANNOUNCE] v6.6-rc2-rt4

From: Sebastian Andrzej Siewior
Date: Fri Sep 22 2023 - 11:21:32 EST

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Dear RT folks!

I'm pleased to announce the v6.6-rc2-rt4 patch set.

Changes since v6.6-rc2-rt3:

- "sander44" reported a warning originating from amdgpu driver.

Known issues
None

The delta patch against v6.6-rc2-rt3 is appended below and can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.6/incr/patch-6.6-rc2-rt3-rt4.patch.xz

You can get this release via the git tree at:

https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v6.6-rc2-rt4

The RT patch against v6.6-rc2 can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patch-6.6-rc2-rt4.patch.xz

The split quilt queue is available at:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6-rc2-rt4.tar.xz

Sebastian

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 172aa10a8800f..4ae4720535a56 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
@@ -60,11 +60,9 @@ static DEFINE_PER_CPU(int, fpu_recursion_depth);
*/
inline void dc_assert_fp_enabled(void)
{
- int *pcpu, depth = 0;
+ int depth;

- pcpu = get_cpu_ptr(&fpu_recursion_depth);
- depth = *pcpu;
- put_cpu_ptr(&fpu_recursion_depth);
+ depth = __this_cpu_read(fpu_recursion_depth);

ASSERT(depth >= 1);
}
@@ -84,33 +82,28 @@ inline void dc_assert_fp_enabled(void)
*/
void dc_fpu_begin(const char *function_name, const int line)
{
- int *pcpu;
+ int depth;

- pcpu = get_cpu_ptr(&fpu_recursion_depth);
- *pcpu += 1;
+ WARN_ON_ONCE(!in_task());
+ preempt_disable();
+ depth = __this_cpu_inc_return(fpu_recursion_depth);

- if (*pcpu == 1) {
+ if (depth == 1) {
#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
- migrate_disable();
kernel_fpu_begin();
#elif defined(CONFIG_PPC64)
- if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
- preempt_disable();
+ if (cpu_has_feature(CPU_FTR_VSX_COMP))
enable_kernel_vsx();
- } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
- preempt_disable();
+ else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
enable_kernel_altivec();
- } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
- preempt_disable();
+ else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
enable_kernel_fp();
- }
#elif defined(CONFIG_ARM64)
kernel_neon_begin();
#endif
}

- TRACE_DCN_FPU(true, function_name, line, *pcpu);
- put_cpu_ptr(&fpu_recursion_depth);
+ TRACE_DCN_FPU(true, function_name, line, depth);
}

/**
@@ -125,30 +118,26 @@ void dc_fpu_begin(const char *function_name, const int line)
*/
void dc_fpu_end(const char *function_name, const int line)
{
- int *pcpu;
+ int depth;

- pcpu = get_cpu_ptr(&fpu_recursion_depth);
- *pcpu -= 1;
- if (*pcpu <= 0) {
+ depth = __this_cpu_dec_return(fpu_recursion_depth);
+ if (depth == 0) {
#if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
kernel_fpu_end();
- migrate_enable();
#elif defined(CONFIG_PPC64)
- if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
+ if (cpu_has_feature(CPU_FTR_VSX_COMP))
disable_kernel_vsx();
- preempt_enable();
- } else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP)) {
+ else if (cpu_has_feature(CPU_FTR_ALTIVEC_COMP))
disable_kernel_altivec();
- preempt_enable();
- } else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE)) {
+ else if (!cpu_has_feature(CPU_FTR_FPU_UNAVAILABLE))
disable_kernel_fp();
- preempt_enable();
- }
#elif defined(CONFIG_ARM64)
kernel_neon_end();
#endif
+ } else {
+ WARN_ON_ONCE(depth < 0);
}

- TRACE_DCN_FPU(false, function_name, line, *pcpu);
- put_cpu_ptr(&fpu_recursion_depth);
+ TRACE_DCN_FPU(false, function_name, line, depth);
+ preempt_enable();
}
diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index d587f807dfd7c..5036a3e608324 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -2141,9 +2141,17 @@ bool dcn20_validate_bandwidth(struct dc *dc, struct dc_state *context,
bool fast_validate)
{
bool voltage_supported;
+ display_e2e_pipe_params_st *pipes;
+
+ pipes = kcalloc(dc->res_pool->pipe_count, sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+ if (!pipes)
+ return false;
+
DC_FP_START();
- voltage_supported = dcn20_validate_bandwidth_fp(dc, context, fast_validate);
+ voltage_supported = dcn20_validate_bandwidth_fp(dc, context, fast_validate, pipes);
DC_FP_END();
+
+ kfree(pipes);
return voltage_supported;
}

diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index d1a25fe6c44fa..5674c3450fc36 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -953,9 +953,17 @@ static bool dcn21_validate_bandwidth(struct dc *dc, struct dc_state *context,
bool fast_validate)
{
bool voltage_supported;
+ display_e2e_pipe_params_st *pipes;
+
+ pipes = kcalloc(dc->res_pool->pipe_count, sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+ if (!pipes)
+ return false;
+
DC_FP_START();
- voltage_supported = dcn21_validate_bandwidth_fp(dc, context, fast_validate);
+ voltage_supported = dcn21_validate_bandwidth_fp(dc, context, fast_validate, pipes);
DC_FP_END();
+
+ kfree(pipes);
return voltage_supported;
}

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
index 5805fb02af14e..2ad92497b9bf2 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c
@@ -1923,7 +1923,7 @@ void dcn20_patch_bounding_box(struct dc *dc, struct _vcs_dpi_soc_bounding_box_st
}

static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *context,
- bool fast_validate)
+ bool fast_validate, display_e2e_pipe_params_st *pipes)
{
bool out = false;

@@ -1932,7 +1932,6 @@ static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *co
int vlevel = 0;
int pipe_split_from[MAX_PIPES];
int pipe_cnt = 0;
- display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_ATOMIC);
DC_LOGGER_INIT(dc->ctx->logger);

BW_VAL_TRACE_COUNT();
@@ -1967,16 +1966,14 @@ static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *co
out = false;

validate_out:
- kfree(pipes);

BW_VAL_TRACE_FINISH();

return out;
}

-bool dcn20_validate_bandwidth_fp(struct dc *dc,
- struct dc_state *context,
- bool fast_validate)
+bool dcn20_validate_bandwidth_fp(struct dc *dc, struct dc_state *context,
+ bool fast_validate, display_e2e_pipe_params_st *pipes)
{
bool voltage_supported = false;
bool full_pstate_supported = false;
@@ -1995,11 +1992,11 @@ bool dcn20_validate_bandwidth_fp(struct dc *dc,
ASSERT(context != dc->current_state);

if (fast_validate) {
- return dcn20_validate_bandwidth_internal(dc, context, true);
+ return dcn20_validate_bandwidth_internal(dc, context, true, pipes);
}

// Best case, we support full UCLK switch latency
- voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false);
+ voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false, pipes);
full_pstate_supported = context->bw_ctx.bw.dcn.clk.p_state_change_support;

if (context->bw_ctx.dml.soc.dummy_pstate_latency_us == 0 ||
@@ -2011,7 +2008,8 @@ bool dcn20_validate_bandwidth_fp(struct dc *dc,
// Fallback: Try to only support G6 temperature read latency
context->bw_ctx.dml.soc.dram_clock_change_latency_us = context->bw_ctx.dml.soc.dummy_pstate_latency_us;

- voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false);
+ memset(pipes, 0, dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st));
+ voltage_supported = dcn20_validate_bandwidth_internal(dc, context, false, pipes);
dummy_pstate_supported = context->bw_ctx.bw.dcn.clk.p_state_change_support;

if (voltage_supported && (dummy_pstate_supported || !(context->stream_count))) {
@@ -2216,9 +2214,8 @@ static void dcn21_calculate_wm(struct dc *dc, struct dc_state *context,
&context->bw_ctx.dml, pipes, pipe_cnt);
}

-bool dcn21_validate_bandwidth_fp(struct dc *dc,
- struct dc_state *context,
- bool fast_validate)
+bool dcn21_validate_bandwidth_fp(struct dc *dc, struct dc_state *context,
+ bool fast_validate, display_e2e_pipe_params_st *pipes)
{
bool out = false;

@@ -2227,7 +2224,6 @@ bool dcn21_validate_bandwidth_fp(struct dc *dc,
int vlevel = 0;
int pipe_split_from[MAX_PIPES];
int pipe_cnt = 0;
- display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_ATOMIC);
DC_LOGGER_INIT(dc->ctx->logger);

BW_VAL_TRACE_COUNT();
@@ -2267,7 +2263,6 @@ bool dcn21_validate_bandwidth_fp(struct dc *dc,
out = false;

validate_out:
- kfree(pipes);

BW_VAL_TRACE_FINISH();

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h
index c51badf7b68a9..b6c34198ddc86 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h
@@ -61,9 +61,8 @@ void dcn20_update_bounding_box(struct dc *dc,
unsigned int num_states);
void dcn20_patch_bounding_box(struct dc *dc,
struct _vcs_dpi_soc_bounding_box_st *bb);
-bool dcn20_validate_bandwidth_fp(struct dc *dc,
- struct dc_state *context,
- bool fast_validate);
+bool dcn20_validate_bandwidth_fp(struct dc *dc, struct dc_state *context,
+ bool fast_validate, display_e2e_pipe_params_st *pipes);
void dcn20_fpu_set_wm_ranges(int i,
struct pp_smu_wm_range_sets *ranges,
struct _vcs_dpi_soc_bounding_box_st *loaded_bb);
@@ -77,9 +76,8 @@ int dcn21_populate_dml_pipes_from_context(struct dc *dc,
struct dc_state *context,
display_e2e_pipe_params_st *pipes,
bool fast_validate);
-bool dcn21_validate_bandwidth_fp(struct dc *dc,
- struct dc_state *context,
- bool fast_validate);
+bool dcn21_validate_bandwidth_fp(struct dc *dc, struct dc_state *context, bool
+ fast_validate, display_e2e_pipe_params_st *pipes);
void dcn21_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params);

void dcn21_clk_mgr_set_bw_params_wm_table(struct clk_bw_params *bw_params);
diff --git a/localversion-rt b/localversion-rt
index 1445cd65885cd..ad3da1bcab7e8 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt3
+-rt4

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