[v2] Retrieve System Cache Table (SCT) descriptors from a shared memory region.

[PATCH v2 0/3] Retrieve System Cache Table (SCT) descriptors from a shared memory region.

Posted by Francisco Munoz Ruiz 2 months, 1 week ago

On newer Qualcomm platforms, SCT initialization and programming are
handled entirely by firmware outside of Linux. The kernel is expected
to consume the pre-initialized descriptor data rather than configure
the SCT itself. The LLCC driver therefore only needs to locate and
parse the descriptor table provided by firmware.

This change implements support for this mechanism in the llcc-qcom
driver, enabling SCT consumption on platforms that expose SCT
programming through firmware. The existing behavior for SoCs where
the kernel programs SCT directly remains unchanged.

Signed-off-by: Francisco Munoz Ruiz <francisco.ruiz@oss.qualcomm.com>
---
Changes in v2:
- dt-bindings: cache: qcom,llcc: Drop "and future SoCs" from commit message subject (Krzysztof Kozlowski)
- dt-bindings: cache: qcom,llcc: Revert binding description (Krzysztof Kozlowski)

- Link to v1: https://lore.kernel.org/r/20260401-external_llcc_changes2set-v1-0-97645ede9f6a@oss.qualcomm.com

---
Francisco Munoz Ruiz (3):
      dt-bindings: cache: qcom,llcc: Document Hawi SoC
      soc: qcom: llcc-qcom: get SCT descriptors from fw-populated memory
      soc: qcom: llcc-qcom: Capitalize LLCC/EDAC in comments and diagnostics

 .../devicetree/bindings/cache/qcom,llcc.yaml       |  19 ++
 drivers/soc/qcom/llcc-qcom.c                       | 301 +++++++++++++++++----
 include/linux/soc/qcom/llcc-qcom.h                 |  44 +--
 3 files changed, 293 insertions(+), 71 deletions(-)
---
base-commit: bd0f139e5fc11182777b81cefc3893ea508544ec
change-id: 20260401-external_llcc_changes2set-5ee118ac7152

Best regards,
-- 
Francisco Munoz Ruiz <francisco.ruiz@oss.qualcomm.com>

Re: [PATCH v2 0/3] Retrieve System Cache Table (SCT) descriptors from a shared memory region.

Posted by Bjorn Andersson 1 month ago

On Tue, 07 Apr 2026 14:51:46 -0700, Francisco Munoz Ruiz wrote:
> On newer Qualcomm platforms, SCT initialization and programming are
> handled entirely by firmware outside of Linux. The kernel is expected
> to consume the pre-initialized descriptor data rather than configure
> the SCT itself. The LLCC driver therefore only needs to locate and
> parse the descriptor table provided by firmware.
> 
> This change implements support for this mechanism in the llcc-qcom
> driver, enabling SCT consumption on platforms that expose SCT
> programming through firmware. The existing behavior for SoCs where
> the kernel programs SCT directly remains unchanged.
> 
> [...]

Applied, thanks!

[1/3] dt-bindings: cache: qcom,llcc: Document Hawi SoC
      commit: cb4a414bacbfdcb837048146b8979032d87e4961
[2/3] soc: qcom: llcc-qcom: get SCT descriptors from fw-populated memory
      commit: ac23106a9b9a0f6ed90002ae3d6fe7c14e97e6bf
[3/3] soc: qcom: llcc-qcom: Capitalize LLCC/EDAC in comments and diagnostics
      commit: 06a84c2d3ca4b9b54724e79717c2cfd9a59947d9

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>