On 19/04/22 13:47, Siva Mullati wrote:
> On 18/04/22 16:33, Balasubramani Vivekanandan wrote:
>> On 16.03.2022 18:26, Mullati Siva wrote:
>>> From: Siva Mullati <[email protected]>
>>>
>>> Convert slpc shared data to use iosys_map rather than
>>> plain pointer and save it in the intel_guc_slpc struct.
>>> This will help with in read and update slpc shared data
>>> after the slpc init by abstracting the IO vs system memory.
>>>
>>> Signed-off-by: Siva Mullati <[email protected]>
>>> ---
>>> drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 79 +++++++++++--------
>>> .../gpu/drm/i915/gt/uc/intel_guc_slpc_types.h | 5 +-
>>> 2 files changed, 47 insertions(+), 37 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>>> b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>>> index 9f032c65a488..3a9ec6b03ceb 100644
>>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
>>> @@ -14,6 +14,13 @@
>>> #include "gt/intel_gt_regs.h"
>>> #include "gt/intel_rps.h"
>>>
>>> +#define slpc_blob_read(slpc_, field_) \
>>> + iosys_map_rd_field(&(slpc_)->slpc_map, 0, \
>>> + struct slpc_shared_data, field_)
>>> +#define slpc_blob_write(slpc_, field_, val_) \
>>> + iosys_map_wr_field(&(slpc_)->slpc_map, 0, \
>>> + struct slpc_shared_data, field_, val_)
>>> +
>>> static inline struct intel_guc *slpc_to_guc(struct intel_guc_slpc *slpc)
>>> {
>>> return container_of(slpc, struct intel_guc, slpc);
>>> @@ -52,50 +59,50 @@ void intel_guc_slpc_init_early(struct intel_guc_slpc
>>> *slpc)
>>> slpc->selected = __guc_slpc_selected(guc);
>>> }
>>>
>>> -static void slpc_mem_set_param(struct slpc_shared_data *data,
>>> +static void slpc_mem_set_param(struct intel_guc_slpc *slpc,
>>> u32 id, u32 value)
>>> {
>>> + u32 bits = slpc_blob_read(slpc, override_params.bits[id >> 5]);
>>> +
>>> GEM_BUG_ON(id >= SLPC_MAX_OVERRIDE_PARAMETERS);
>>> /*
>>> * When the flag bit is set, corresponding value will be read
>>> * and applied by SLPC.
>>> */
>>> - data->override_params.bits[id >> 5] |= (1 << (id % 32));
>>> - data->override_params.values[id] = value;
>>> + bits |= (1 << (id % 32));
>>> + slpc_blob_write(slpc, override_params.bits[id >> 5], bits);
>>> + slpc_blob_write(slpc, override_params.values[id], value);
>>> }
>>>
>>> -static void slpc_mem_set_enabled(struct slpc_shared_data *data,
>>> +static void slpc_mem_set_enabled(struct intel_guc_slpc *slpc,
>>> u8 enable_id, u8 disable_id)
>>> {
>>> /*
>>> * Enabling a param involves setting the enable_id
>>> * to 1 and disable_id to 0.
>>> */
>>> - slpc_mem_set_param(data, enable_id, 1);
>>> - slpc_mem_set_param(data, disable_id, 0);
>>> + slpc_mem_set_param(slpc, enable_id, 1);
>>> + slpc_mem_set_param(slpc, disable_id, 0);
>>> }
>>>
>>> -static void slpc_mem_set_disabled(struct slpc_shared_data *data,
>>> +static void slpc_mem_set_disabled(struct intel_guc_slpc *slpc,
>>> u8 enable_id, u8 disable_id)
>>> {
>>> /*
>>> * Disabling a param involves setting the enable_id
>>> * to 0 and disable_id to 1.
>>> */
>>> - slpc_mem_set_param(data, disable_id, 1);
>>> - slpc_mem_set_param(data, enable_id, 0);
>>> + slpc_mem_set_param(slpc, disable_id, 1);
>>> + slpc_mem_set_param(slpc, enable_id, 0);
>>> }
>>>
>>> static u32 slpc_get_state(struct intel_guc_slpc *slpc)
>>> {
>>> - struct slpc_shared_data *data;
>>> -
>>> GEM_BUG_ON(!slpc->vma);
>>>
>>> - drm_clflush_virt_range(slpc->vaddr, sizeof(u32));
>>> - data = slpc->vaddr;
>>> + drm_clflush_virt_range(slpc->slpc_map.vaddr, sizeof(u32));
>> clflush will not be required if the slpc_map contains io memory address.
>> So the drm_clflush_virt_range can be added under a check for system
>> memory
> Agreed!
>>>
>>> - return data->header.global_state;
>>> + return slpc_blob_read(slpc, header.global_state);
>>> }
>>>
>>> static int guc_action_slpc_set_param(struct intel_guc *guc, u8 id, u32
>>> value)
>>> @@ -156,7 +163,7 @@ static int slpc_query_task_state(struct intel_guc_slpc
>>> *slpc)
>>> drm_err(&i915->drm, "Failed to query task state (%pe)\n",
>>> ERR_PTR(ret));
>>>
>>> - drm_clflush_virt_range(slpc->vaddr, SLPC_PAGE_SIZE_BYTES);
>>> + drm_clflush_virt_range(slpc->slpc_map.vaddr, SLPC_PAGE_SIZE_BYTES);
>> Also here we need clfush only for system memory address.
>>>
>>> return ret;
>>> }
>>> @@ -243,10 +250,11 @@ int intel_guc_slpc_init(struct intel_guc_slpc *slpc)
>>> struct drm_i915_private *i915 = slpc_to_i915(slpc);
>>> u32 size = PAGE_ALIGN(sizeof(struct slpc_shared_data));
>>> int err;
>>> + void *vaddr;
>>>
>>> GEM_BUG_ON(slpc->vma);
>>>
>>> - err = intel_guc_allocate_and_map_vma(guc, size, &slpc->vma, (void
>>> **)&slpc->vaddr);
>>> + err = intel_guc_allocate_and_map_vma(guc, size, &slpc->vma, (void
>>> **)&vaddr);
>>> if (unlikely(err)) {
>>> drm_err(&i915->drm,
>>> "Failed to allocate SLPC struct (err=%pe)\n",
>>> @@ -254,6 +262,12 @@ int intel_guc_slpc_init(struct intel_guc_slpc *slpc)
>>> return err;
>>> }
>>>
>>> + if (i915_gem_object_is_lmem(slpc->vma->obj))
>>> + iosys_map_set_vaddr_iomem(&slpc->slpc_map,
>>> + (void __iomem *)vaddr);
>>> + else
>>> + iosys_map_set_vaddr(&slpc->slpc_map, vaddr);
>>> +
>>> slpc->max_freq_softlimit = 0;
>>> slpc->min_freq_softlimit = 0;
>>>
>>> @@ -335,40 +349,37 @@ static int slpc_reset(struct intel_guc_slpc *slpc)
>>>
>>> static u32 slpc_decode_min_freq(struct intel_guc_slpc *slpc)
>>> {
>>> - struct slpc_shared_data *data = slpc->vaddr;
>>> -
>>> GEM_BUG_ON(!slpc->vma);
>>>
>>> return DIV_ROUND_CLOSEST(REG_FIELD_GET(SLPC_MIN_UNSLICE_FREQ_MASK,
>>> - data->task_state_data.freq) *
>>> + slpc_blob_read(slpc, task_state_data.freq)) *
>>> GT_FREQUENCY_MULTIPLIER, GEN9_FREQ_SCALER);
>>> }
>>>
>>> static u32 slpc_decode_max_freq(struct intel_guc_slpc *slpc)
>>> {
>>> - struct slpc_shared_data *data = slpc->vaddr;
>>> -
>>> GEM_BUG_ON(!slpc->vma);
>>>
>>> return DIV_ROUND_CLOSEST(REG_FIELD_GET(SLPC_MAX_UNSLICE_FREQ_MASK,
>>> - data->task_state_data.freq) *
>>> + slpc_blob_read(slpc, task_state_data.freq)) *
>>> GT_FREQUENCY_MULTIPLIER, GEN9_FREQ_SCALER);
>>> }
>>>
>>> -static void slpc_shared_data_reset(struct slpc_shared_data *data)
>>> +static void slpc_shared_data_reset(struct intel_guc_slpc *slpc)
>>> {
>>> - memset(data, 0, sizeof(struct slpc_shared_data));
>>> -
>>> - data->header.size = sizeof(struct slpc_shared_data);
>>> + iosys_map_memset(&slpc->slpc_map,
>>> + 0, 0, sizeof(struct slpc_shared_data));
>>> + slpc_blob_write(slpc,
>>> + header.size, sizeof(struct slpc_shared_data));
>>>
>>> /* Enable only GTPERF task, disable others */
>>> - slpc_mem_set_enabled(data, SLPC_PARAM_TASK_ENABLE_GTPERF,
>>> + slpc_mem_set_enabled(slpc, SLPC_PARAM_TASK_ENABLE_GTPERF,
>>> SLPC_PARAM_TASK_DISABLE_GTPERF);
>>>
>>> - slpc_mem_set_disabled(data, SLPC_PARAM_TASK_ENABLE_BALANCER,
>>> + slpc_mem_set_disabled(slpc, SLPC_PARAM_TASK_ENABLE_BALANCER,
>>> SLPC_PARAM_TASK_DISABLE_BALANCER);
>>>
>>> - slpc_mem_set_disabled(data, SLPC_PARAM_TASK_ENABLE_DCC,
>>> + slpc_mem_set_disabled(slpc, SLPC_PARAM_TASK_ENABLE_DCC,
>>> SLPC_PARAM_TASK_DISABLE_DCC);
>> After converting to iosys_map instance, each
>> slpc_mem_set_enabled/disabled calls slpc_mem_set_param twice and each
>> slpc_mem_set_param calls slpc_blob_read/write 3 times resulting in 18
>> calls to memcpy.
>> Therefore it is efficient to consolidate all updates by reading the
>> complete override_params field, update necessary members and finally
>> overwrite the entire override_params.
>>
>> Regards,
>> Bala
>From what we discussed, I am leaving this comment and remain
this change as is, since the suggested change would require entire
struct slpc_override_param copying which is about 264 words size.
>>> }
>>>
>>> @@ -617,7 +628,7 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
>>>
>>> GEM_BUG_ON(!slpc->vma);
>>>
>>> - slpc_shared_data_reset(slpc->vaddr);
>>> + slpc_shared_data_reset(slpc);
>>>
>>> ret = slpc_reset(slpc);
>>> if (unlikely(ret < 0)) {
>>> @@ -705,8 +716,6 @@ void intel_guc_slpc_dec_waiters(struct intel_guc_slpc
>>> *slpc)
>>> int intel_guc_slpc_print_info(struct intel_guc_slpc *slpc, struct
>>> drm_printer *p)
>>> {
>>> struct drm_i915_private *i915 = slpc_to_i915(slpc);
>>> - struct slpc_shared_data *data = slpc->vaddr;
>>> - struct slpc_task_state_data *slpc_tasks;
>>> intel_wakeref_t wakeref;
>>> int ret = 0;
>>>
>>> @@ -716,11 +725,10 @@ int intel_guc_slpc_print_info(struct intel_guc_slpc
>>> *slpc, struct drm_printer *p
>>> ret = slpc_query_task_state(slpc);
>>>
>>> if (!ret) {
>>> - slpc_tasks = &data->task_state_data;
>>> -
>>> drm_printf(p, "\tSLPC state: %s\n",
>>> slpc_get_state_string(slpc));
>>> drm_printf(p, "\tGTPERF task active: %s\n",
>>> - str_yes_no(slpc_tasks->status &
>>> SLPC_GTPERF_TASK_ENABLED));
>>> + str_yes_no(slpc_blob_read(slpc,
>>> task_state_data.status) &
>>> + SLPC_GTPERF_TASK_ENABLED));
>>> drm_printf(p, "\tMax freq: %u MHz\n",
>>> slpc_decode_max_freq(slpc));
>>> drm_printf(p, "\tMin freq: %u MHz\n",
>>> @@ -739,4 +747,5 @@ void intel_guc_slpc_fini(struct intel_guc_slpc *slpc)
>>> return;
>>>
>>> i915_vma_unpin_and_release(&slpc->vma, I915_VMA_RELEASE_MAP);
>>> + iosys_map_clear(&slpc->slpc_map);
>>> }
>>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>>> b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>>> index bf5b9a563c09..96f524f25b52 100644
>>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc_types.h
>>> @@ -7,15 +7,16 @@
>>> #define _INTEL_GUC_SLPC_TYPES_H_
>>>
>>> #include <linux/atomic.h>
>>> -#include <linux/workqueue.h>
>>> +#include <linux/iosys-map.h>
>>> #include <linux/mutex.h>
>>> #include <linux/types.h>
>>> +#include <linux/workqueue.h>
>>>
>>> #define SLPC_RESET_TIMEOUT_MS 5
>>>
>>> struct intel_guc_slpc {
>>> struct i915_vma *vma;
>>> - struct slpc_shared_data *vaddr;
>>> + struct iosys_map slpc_map;
>>> bool supported;
>>> bool selected;
>>>
>>> --
>>> 2.33.0
>>>
