[Intel-gfx] [PATCH 1/4] drm/i915: Nuke not needed members of dram_info
Lucas De Marchi
lucas.demarchi at intel.com
Wed Jan 27 14:35:27 UTC 2021
On Wed, Jan 20, 2021 at 07:29:37PM +0000, Jose Souza wrote:
>On Wed, 2021-01-20 at 10:52 -0800, Lucas De Marchi wrote:
>> On Wed, Jan 20, 2021 at 10:42:46AM -0800, Jose Souza wrote:
>> > On Wed, 2021-01-20 at 10:31 -0800, Lucas De Marchi wrote:
>> > > On Wed, Jan 20, 2021 at 07:16:08AM -0800, Jose Souza wrote:
>> > > > Valid, ranks and bandwidth_kbps are set into dram_info but are not
>> > > > used anywhere else so nuking it.
>> > > >
>> > > > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
>> > > > ---
>> > > > drivers/gpu/drm/i915/i915_drv.c | 4 +--
>> > > > drivers/gpu/drm/i915/i915_drv.h | 3 --
>> > > > drivers/gpu/drm/i915/intel_dram.c | 47 +++++++------------------------
>> > > > 3 files changed, 12 insertions(+), 42 deletions(-)
>> > > >
>> > > > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
>> > > > index f5666b44ea9d..a1cc60de99f0 100644
>> > > > --- a/drivers/gpu/drm/i915/i915_drv.c
>> > > > +++ b/drivers/gpu/drm/i915/i915_drv.c
>> > > > @@ -609,8 +609,8 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
>> > > >
>> > > > intel_opregion_setup(dev_priv);
>> > > > /*
>> > > > - * Fill the dram structure to get the system raw bandwidth and
>> > > > - * dram info. This will be used for memory latency calculation.
>> > > > + * Fill the dram structure to get the system dram info. This will be
>> > > > + * used for memory latency calculation.
>> > > > */
>> > > > intel_dram_detect(dev_priv);
>> > > >
>> > > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>> > > > index 8376cff5ba86..250e92910fa1 100644
>> > > > --- a/drivers/gpu/drm/i915/i915_drv.h
>> > > > +++ b/drivers/gpu/drm/i915/i915_drv.h
>> > > > @@ -1134,11 +1134,8 @@ struct drm_i915_private {
>> > > > } wm;
>> > > >
>> > > > struct dram_info {
>> > > > - bool valid;
>> > > > bool is_16gb_dimm;
>> > > > u8 num_channels;
>> > > > - u8 ranks;
>> > > > - u32 bandwidth_kbps;
>> > > > bool symmetric_memory;
>> > > > enum intel_dram_type {
>> > > > INTEL_DRAM_UNKNOWN,
>> > > > diff --git a/drivers/gpu/drm/i915/intel_dram.c b/drivers/gpu/drm/i915/intel_dram.c
>> > > > index 4754296a250e..694fbd8c9cd4 100644
>> > > > --- a/drivers/gpu/drm/i915/intel_dram.c
>> > > > +++ b/drivers/gpu/drm/i915/intel_dram.c
>> > > > @@ -201,17 +201,7 @@ skl_dram_get_channels_info(struct drm_i915_private *i915)
>> > > > return -EINVAL;
>> > > > }
>> > > >
>> > > > - /*
>> > > > - * If any of the channel is single rank channel, worst case output
>> > > > - * will be same as if single rank memory, so consider single rank
>> > > > - * memory.
>> > > > - */
>> > > > - if (ch0.ranks == 1 || ch1.ranks == 1)
>> > > > - dram_info->ranks = 1;
>> > > > - else
>> > > > - dram_info->ranks = max(ch0.ranks, ch1.ranks);
>> > > > -
>> > > > - if (dram_info->ranks == 0) {
>> > > > + if (ch0.ranks == 0 && ch1.ranks == 0) {
>> > >
>> > > previously if any of them were != 0, we would not fall here.
>> >
>> > This is the same behavior.
>>
>> indeed, I misread the condition
>>
>> >
>> > >
>> > >
>> > > > drm_info(&i915->drm, "couldn't get memory rank information\n");
>> > > > return -EINVAL;
>> > > > }
>> > > > @@ -269,16 +259,12 @@ skl_get_dram_info(struct drm_i915_private *i915)
>> > > > mem_freq_khz = DIV_ROUND_UP((val & SKL_REQ_DATA_MASK) *
>> > > > SKL_MEMORY_FREQ_MULTIPLIER_HZ, 1000);
>> > > >
>> > > > - dram_info->bandwidth_kbps = dram_info->num_channels *
>> > > > - mem_freq_khz * 8;
>> > > > -
>> > > > - if (dram_info->bandwidth_kbps == 0) {
>> > > > + if (dram_info->num_channels * mem_freq_khz == 0) {
>> > > > drm_info(&i915->drm,
>> > > > "Couldn't get system memory bandwidth\n");
>> > > > return -EINVAL;
>> > > > }
>> > > >
>> > > > - dram_info->valid = true;
>> > > > return 0;
>> > > > }
>> > > >
>> > > > @@ -365,7 +351,7 @@ static int bxt_get_dram_info(struct drm_i915_private *i915)
>> > > > struct dram_info *dram_info = &i915->dram_info;
>> > > > u32 dram_channels;
>> > > > u32 mem_freq_khz, val;
>> > > > - u8 num_active_channels;
>> > > > + u8 num_active_channels, valid_ranks = 0;
>> > > > int i;
>> > > >
>> > > > val = intel_uncore_read(&i915->uncore, BXT_P_CR_MC_BIOS_REQ_0_0_0);
>> > > > @@ -375,10 +361,7 @@ static int bxt_get_dram_info(struct drm_i915_private *i915)
>> > > > dram_channels = val & BXT_DRAM_CHANNEL_ACTIVE_MASK;
>> > > > num_active_channels = hweight32(dram_channels);
>> > > >
>> > > > - /* Each active bit represents 4-byte channel */
>> > > > - dram_info->bandwidth_kbps = (mem_freq_khz * num_active_channels * 4);
>> > > > -
>> > > > - if (dram_info->bandwidth_kbps == 0) {
>> > > > + if (mem_freq_khz * num_active_channels == 0) {
>> > >
>> > > maybe better to replace with a local var?
>> > >
>> > > bandwidth_kbps = mem_freq_khz * num_active_channels;
>> > >
>> > > and then check it where needed.
>> >
>> > The only place it is used is in this if to return -EINVAL, same for the SKL function.
>> > The multiplication fits under the 80 col limit so don't see why add a local var.
>>
>> ok... maybe `if (!mem_freq_khz || !num_active_channels)` then?
>
>That works too but I still prefer keep it as close as possible from the previous check.
Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>
Lucas De Marchi
>
>>
>>
>> LUcas De Marchi
>>
>> >
>> > >
>> > > Lucas De Marchi
>> > >
>> > > > drm_info(&i915->drm,
>> > > > "Couldn't get system memory bandwidth\n");
>> > > > return -EINVAL;
>> > > > @@ -410,27 +393,18 @@ static int bxt_get_dram_info(struct drm_i915_private *i915)
>> > > > dimm.size, dimm.width, dimm.ranks,
>> > > > intel_dram_type_str(type));
>> > > >
>> > > > - /*
>> > > > - * If any of the channel is single rank channel,
>> > > > - * worst case output will be same as if single rank
>> > > > - * memory, so consider single rank memory.
>> > > > - */
>> > > > - if (dram_info->ranks == 0)
>> > > > - dram_info->ranks = dimm.ranks;
>> > > > - else if (dimm.ranks == 1)
>> > > > - dram_info->ranks = 1;
>> > > > + if (valid_ranks == 0)
>> > > > + valid_ranks = dimm.ranks;
>> > > >
>> > > > if (type != INTEL_DRAM_UNKNOWN)
>> > > > dram_info->type = type;
>> > > > }
>> > > >
>> > > > - if (dram_info->type == INTEL_DRAM_UNKNOWN || dram_info->ranks == 0) {
>> > > > + if (dram_info->type == INTEL_DRAM_UNKNOWN || valid_ranks == 0) {
>> > > > drm_info(&i915->drm, "couldn't get memory information\n");
>> > > > return -EINVAL;
>> > > > }
>> > > >
>> > > > - dram_info->valid = true;
>> > > > -
>> > > > return 0;
>> > > > }
>> > > >
>> > > > @@ -456,11 +430,10 @@ void intel_dram_detect(struct drm_i915_private *i915)
>> > > > if (ret)
>> > > > return;
>> > > >
>> > > > - drm_dbg_kms(&i915->drm, "DRAM bandwidth: %u kBps, channels: %u\n",
>> > > > - dram_info->bandwidth_kbps, dram_info->num_channels);
>> > > > + drm_dbg_kms(&i915->drm, "DRAM channels: %u\n", dram_info->num_channels);
>> > > >
>> > > > - drm_dbg_kms(&i915->drm, "DRAM ranks: %u, 16Gb DIMMs: %s\n",
>> > > > - dram_info->ranks, yesno(dram_info->is_16gb_dimm));
>> > > > + drm_dbg_kms(&i915->drm, "DRAM 16Gb DIMMs: %s\n",
>> > > > + yesno(dram_info->is_16gb_dimm));
>> > > > }
>> > > >
>> > > > static u32 gen9_edram_size_mb(struct drm_i915_private *i915, u32 cap)
>> > > > --
>> > > > 2.30.0
>> > > >
>> > > > _______________________________________________
>> > > > Intel-gfx mailing list
>> > > > Intel-gfx at lists.freedesktop.org
>> > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>> >
>
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