| Message ID | 20241113-topic-sm8x50-gpu-bw-vote-v1-4-3b8d39737a9b@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | drm/msm: adreno: add support for DDR bandwidth scaling via GMU | expand |
On Wed, Nov 13, 2024 at 04:48:30PM +0100, Neil Armstrong wrote: > The Adreno GPU Management Unit (GMU) can also scale the ddr > bandwidth along the frequency and power domain level, but for > now we statically fill the bw_table with values from the > downstream driver. > > Only the first entry is used, which is a disable vote, so we > currently rely on scaling via the linux interconnect paths. > > Let's dynamically generate the bw_table with the vote values > previously calculated from the OPPs. Nice to see this being worked upon. I hope the code can is generic enough so that we can use it from other adreno_foo_build_bw_table() functions. > > Those entried will then be used by the GMU when passing the > appropriate bandwidth level when voting for a gpu frequency. > > Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> > --- > drivers/gpu/drm/msm/adreno/a6xx_hfi.c | 48 +++++++++++++++++++++++++++-------- > 1 file changed, 37 insertions(+), 11 deletions(-) > > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c > index cb8844ed46b29c4569d05eb7a24f7b27e173190f..9a89ba95843e7805d78f0e5ddbe328677b6431dd 100644 > --- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c > +++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c > @@ -596,22 +596,48 @@ static void a730_build_bw_table(struct a6xx_hfi_msg_bw_table *msg) > msg->cnoc_cmds_data[1][0] = 0x60000001; > } > > -static void a740_build_bw_table(struct a6xx_hfi_msg_bw_table *msg) > +static void a740_generate_bw_table(struct adreno_gpu *adreno_gpu, struct a6xx_gmu *gmu, > + struct a6xx_hfi_msg_bw_table *msg) > { > - msg->bw_level_num = 1; > + const struct a6xx_info *info = adreno_gpu->info->a6xx; > + unsigned int i, j; > > - msg->ddr_cmds_num = 3; > msg->ddr_wait_bitmask = 0x7; > > - msg->ddr_cmds_addrs[0] = cmd_db_read_addr("SH0"); > - msg->ddr_cmds_addrs[1] = cmd_db_read_addr("MC0"); > - msg->ddr_cmds_addrs[2] = cmd_db_read_addr("ACV"); > + for (i = 0; i < 3; i++) { > + if (!info->bcm[i].name) > + break; > + msg->ddr_cmds_addrs[i] = cmd_db_read_addr(info->bcm[i].name); > + } > + msg->ddr_cmds_num = i; > > - msg->ddr_cmds_data[0][0] = 0x40000000; > - msg->ddr_cmds_data[0][1] = 0x40000000; > - msg->ddr_cmds_data[0][2] = 0x40000000; > + for (i = 0; i < gmu->nr_gpu_bws; ++i) > + for (j = 0; j < msg->ddr_cmds_num; j++) > + msg->ddr_cmds_data[i][j] = gmu->gpu_bw_votes[i][j]; > + msg->bw_level_num = gmu->nr_gpu_bws; > +} > + > +static void a740_build_bw_table(struct adreno_gpu *adreno_gpu, struct a6xx_gmu *gmu, > + struct a6xx_hfi_msg_bw_table *msg) > +{ > + if ((adreno_gpu->info->quirks & ADRENO_QUIRK_GMU_BW_VOTE) && gmu->nr_gpu_bws) { > + a740_generate_bw_table(adreno_gpu, gmu, msg); > + } else { Why do we need a fallback code here? > + msg->bw_level_num = 1; > > - /* TODO: add a proper dvfs table */ > + msg->ddr_cmds_num = 3; > + msg->ddr_wait_bitmask = 0x7; > + > + msg->ddr_cmds_addrs[0] = cmd_db_read_addr("SH0"); > + msg->ddr_cmds_addrs[1] = cmd_db_read_addr("MC0"); > + msg->ddr_cmds_addrs[2] = cmd_db_read_addr("ACV"); > + > + msg->ddr_cmds_data[0][0] = 0x40000000; > + msg->ddr_cmds_data[0][1] = 0x40000000; > + msg->ddr_cmds_data[0][2] = 0x40000000; > + > + /* TODO: add a proper dvfs table */ I think TODO is unapplicable anymore. > + } > > msg->cnoc_cmds_num = 1; > msg->cnoc_wait_bitmask = 0x1; > @@ -691,7 +717,7 @@ static int a6xx_hfi_send_bw_table(struct a6xx_gmu *gmu) > else if (adreno_is_a730(adreno_gpu)) > a730_build_bw_table(msg); > else if (adreno_is_a740_family(adreno_gpu)) > - a740_build_bw_table(msg); > + a740_build_bw_table(adreno_gpu, gmu, msg); > else > a6xx_build_bw_table(msg); > > > -- > 2.34.1 >
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c index cb8844ed46b29c4569d05eb7a24f7b27e173190f..9a89ba95843e7805d78f0e5ddbe328677b6431dd 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c @@ -596,22 +596,48 @@ static void a730_build_bw_table(struct a6xx_hfi_msg_bw_table *msg) msg->cnoc_cmds_data[1][0] = 0x60000001; } -static void a740_build_bw_table(struct a6xx_hfi_msg_bw_table *msg) +static void a740_generate_bw_table(struct adreno_gpu *adreno_gpu, struct a6xx_gmu *gmu, + struct a6xx_hfi_msg_bw_table *msg) { - msg->bw_level_num = 1; + const struct a6xx_info *info = adreno_gpu->info->a6xx; + unsigned int i, j; - msg->ddr_cmds_num = 3; msg->ddr_wait_bitmask = 0x7; - msg->ddr_cmds_addrs[0] = cmd_db_read_addr("SH0"); - msg->ddr_cmds_addrs[1] = cmd_db_read_addr("MC0"); - msg->ddr_cmds_addrs[2] = cmd_db_read_addr("ACV"); + for (i = 0; i < 3; i++) { + if (!info->bcm[i].name) + break; + msg->ddr_cmds_addrs[i] = cmd_db_read_addr(info->bcm[i].name); + } + msg->ddr_cmds_num = i; - msg->ddr_cmds_data[0][0] = 0x40000000; - msg->ddr_cmds_data[0][1] = 0x40000000; - msg->ddr_cmds_data[0][2] = 0x40000000; + for (i = 0; i < gmu->nr_gpu_bws; ++i) + for (j = 0; j < msg->ddr_cmds_num; j++) + msg->ddr_cmds_data[i][j] = gmu->gpu_bw_votes[i][j]; + msg->bw_level_num = gmu->nr_gpu_bws; +} + +static void a740_build_bw_table(struct adreno_gpu *adreno_gpu, struct a6xx_gmu *gmu, + struct a6xx_hfi_msg_bw_table *msg) +{ + if ((adreno_gpu->info->quirks & ADRENO_QUIRK_GMU_BW_VOTE) && gmu->nr_gpu_bws) { + a740_generate_bw_table(adreno_gpu, gmu, msg); + } else { + msg->bw_level_num = 1; - /* TODO: add a proper dvfs table */ + msg->ddr_cmds_num = 3; + msg->ddr_wait_bitmask = 0x7; + + msg->ddr_cmds_addrs[0] = cmd_db_read_addr("SH0"); + msg->ddr_cmds_addrs[1] = cmd_db_read_addr("MC0"); + msg->ddr_cmds_addrs[2] = cmd_db_read_addr("ACV"); + + msg->ddr_cmds_data[0][0] = 0x40000000; + msg->ddr_cmds_data[0][1] = 0x40000000; + msg->ddr_cmds_data[0][2] = 0x40000000; + + /* TODO: add a proper dvfs table */ + } msg->cnoc_cmds_num = 1; msg->cnoc_wait_bitmask = 0x1; @@ -691,7 +717,7 @@ static int a6xx_hfi_send_bw_table(struct a6xx_gmu *gmu) else if (adreno_is_a730(adreno_gpu)) a730_build_bw_table(msg); else if (adreno_is_a740_family(adreno_gpu)) - a740_build_bw_table(msg); + a740_build_bw_table(adreno_gpu, gmu, msg); else a6xx_build_bw_table(msg);
The Adreno GPU Management Unit (GMU) can also scale the ddr bandwidth along the frequency and power domain level, but for now we statically fill the bw_table with values from the downstream driver. Only the first entry is used, which is a disable vote, so we currently rely on scaling via the linux interconnect paths. Let's dynamically generate the bw_table with the vote values previously calculated from the OPPs. Those entried will then be used by the GMU when passing the appropriate bandwidth level when voting for a gpu frequency. Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> --- drivers/gpu/drm/msm/adreno/a6xx_hfi.c | 48 +++++++++++++++++++++++++++-------- 1 file changed, 37 insertions(+), 11 deletions(-)