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* Merge tag 'icc-5.7-rc1' of https://git.linaro.org/people/georgi.djakov/linux ↵Greg Kroah-Hartman2020-03-2011-688/+2302
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | into char-misc-next Georgi writes: interconnect changes for 5.7 Here is a pull request with interconnect changes for the 5.7-rc1 merge window. It contains just driver updates, and these are: - Refactoring of the SDM845 driver, which is now improved to better represent the hardware. - New driver for SC7180 platforms. - New driver for OSM L3 interconnect hardware found on SDM845/SC7180 platforms. Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> * tag 'icc-5.7-rc1' of https://git.linaro.org/people/georgi.djakov/linux: interconnect: qcom: Add OSM L3 support on SC7180 dt-bindings: interconnect: Add OSM L3 DT binding on SC7180 interconnect: qcom: Add OSM L3 interconnect provider support dt-bindings: interconnect: Add OSM L3 DT bindings interconnect: qcom: Allow icc node to be used across icc providers interconnect: qcom: Add SC7180 interconnect provider driver dt-bindings: interconnect: Add Qualcomm SC7180 DT bindings interconnect: qcom: sdm845: Split qnodes into their respective NoCs interconnect: qcom: Consolidate interconnect RPMh support dt-bindings: interconnect: Update Qualcomm SDM845 DT bindings dt-bindings: interconnect: Add YAML schemas for QCOM bcm-voter dt-bindings: interconnect: Convert qcom,sdm845 to DT schema
| * interconnect: qcom: Add OSM L3 support on SC7180Sibi Sankar2020-03-032-0/+17
| | | | | | | | | | | | | | | | | | | | Add Operating State Manager (OSM) L3 interconnect provider support on SC7180 SoCs. Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Link: https://lore.kernel.org/r/20200227105632.15041-6-sibis@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
| * interconnect: qcom: Add OSM L3 interconnect provider supportSibi Sankar2020-03-034-0/+272
| | | | | | | | | | | | | | | | | | | | | | On some Qualcomm SoCs, Operating State Manager (OSM) controls the resources of scaling L3 caches. Add a driver to handle bandwidth requests to OSM L3 from CPU on SDM845 SoCs. Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Link: https://lore.kernel.org/r/20200227105632.15041-4-sibis@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
| * interconnect: qcom: Allow icc node to be used across icc providersSibi Sankar2020-03-032-133/+141
| | | | | | | | | | | | | | | | | | | | | | Move the icc node ids to a common header, this will allow for referencing/linking of icc nodes to multiple icc providers on SDM845 SoCs. Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Link: https://lore.kernel.org/r/20200227105632.15041-2-sibis@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
| * interconnect: qcom: Add SC7180 interconnect provider driverOdelu Kukatla2020-03-034-0/+802
| | | | | | | | | | | | | | | | | | | | | | Add driver for the Qualcomm interconnect buses found in SC7180 based platforms. The topology consists of several NoCs that are controlled by a remote processor that collects the aggregated bandwidth for each master-slave pairs. Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org> Link: https://lore.kernel.org/r/1583241493-21212-3-git-send-email-okukatla@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
| * interconnect: qcom: sdm845: Split qnodes into their respective NoCsDavid Dai2020-02-281-687/+498
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to better represent the hardware and its different Network-On-Chip devices, split the sdm845 provider driver into NoC specific providers. Remove duplicate functionality already provided by the icc rpmh and bcm voter drivers to calculate and commit bandwidth requests to hardware. Signed-off-by: David Dai <daidavid1@codeaurora.org> Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org> Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Link: https://lore.kernel.org/r/20200209183411.17195-6-sibis@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
| * interconnect: qcom: Consolidate interconnect RPMh supportDavid Dai2020-02-286-0/+704
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add bcm voter driver and add support for RPMh specific interconnect providers which implements the set and aggregate functionalities that translates bandwidth requests into RPMh messages. These modules provide a common set of functionalities for all Qualcomm RPMh based interconnect providers and should help reduce code duplication when adding new providers. Signed-off-by: David Dai <daidavid1@codeaurora.org> Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Link: https://lore.kernel.org/r/20200228095951.15457-1-sibis@codeaurora.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* | interconnect: Handle memory allocation errorsGeorgi Djakov2020-03-031-0/+9
|/ | | | | | | | | | When we allocate memory, kasprintf() can fail and we must check its return value. Fixes: 05309830e1f8 ("interconnect: Add a name to struct icc_path") Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Link: https://lore.kernel.org/r/20200226110420.5357-2-georgi.djakov@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: qcom: Add MSM8916 interconnect provider driverGeorgi Djakov2020-01-073-0/+565
| | | | | | | | | | Add driver for the Qualcomm interconnect buses found in MSM8916 based platforms. The topology consists of three NoCs that are controlled by a remote processor that collects the aggregated bandwidth for each master-slave pairs. Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Check for valid path in icc_set_bw()Georgi Djakov2020-01-071-1/+4
| | | | | | | | Use IS_ERR() to ensure that the path passed to icc_set_bw() is valid. Reviewed-by: Evan Green <evgreen@chromium.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Print the tag in the debugfs summaryGeorgi Djakov2020-01-061-5/+5
| | | | | | | | | Now we can have a tag associated with the path. Add this information to the interconnect_summary file, as the current information in debugfs is incomplete. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add interconnect_graph file to debugfsLeonard Crestez2019-12-161-0/+66
| | | | | | | | | | | | | | | | | | | The interconnect graphs can be difficult to understand and the current "interconnect_summary" file doesn't even display links in any way. Add a new "interconnect_graph" file to debugfs in the graphviz "dot" format which describes interconnect providers, nodes and links. The file is human-readable and can be visualized by piping through graphviz. Example: ssh $TARGET cat /sys/kernel/debug/interconnect/interconnect_graph \ | dot -Tsvg > interconnect_graph.svg Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: Use the standard aggregate functionGeorgi Djakov2019-12-162-24/+6
| | | | | | | | | | Now we have a common function for standard aggregation, so let's use it, instead of duplicating the code. Reviewed-by: Brian Masney <masneyb@onstation.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add a common standard aggregate functionGeorgi Djakov2019-12-161-0/+10
| | | | | | | | | | | | Currently there is one very standard aggregation method that is used by several drivers. Let's add this as a common function, so that drivers could just point to it, instead of copy/pasting code. Suggested-by: Evan Green <evgreen@chromium.org> Reviewed-by: Brian Masney <masneyb@onstation.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add basic tracepointsGeorgi Djakov2019-12-163-0/+96
| | | | | | | | | | | | | | | The tracepoints can help with understanding the system behavior of a given interconnect path when the consumer drivers change their bandwidth demands. This might be interesting when we want to monitor the requested interconnect bandwidth for each client driver. The paths may share the same nodes and this will help to understand "who and when is requesting what". All this is useful for subsystem drivers developers and may also provide hints when optimizing the power and performance profile of the system. Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add a name to struct icc_pathGeorgi Djakov2019-12-162-3/+17
| | | | | | | | | | | | | When debugging interconnect things, it turned out that saving the path name and including it in the traces is quite useful, especially for devices with multiple paths. For the path name we use the one specified in DT, or if we use platform data, the name is based on the source and destination node names. Suggested-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Move internal structs into a separate fileGeorgi Djakov2019-12-162-28/+42
| | | | | | | | | Move the interconnect framework internal structs into a separate file, so that it can be included and used by ftrace code. This will allow us to expose some more useful information in the traces. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: Use the new common helper for node removalGeorgi Djakov2019-12-163-39/+11
| | | | | | | | There is a new helper function for removing all nodes. Let's use it instead of duplicating the code. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add a common helper for removing all nodesGeorgi Djakov2019-12-161-0/+22
| | | | | | | | | | The removal of all nodes from a provider seem to be a common functionality for all existing users and it would make sense to factor out this into a a common helper function. Suggested-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: msm8974: Walk the list safely on node removalGeorgi Djakov2019-12-121-4/+4
| | | | | | | | | | | | As we will remove items off the list using list_del(), we need to use the safe version of list_for_each_entry(). Fixes: 4e60a9568dc6 ("interconnect: qcom: add msm8974 driver") Reported-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Link: https://lore.kernel.org/r/20191212075332.16202-5-georgi.djakov@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: qcom: qcs404: Walk the list safely on node removalGeorgi Djakov2019-12-121-4/+4
| | | | | | | | | | | | | As we will remove items off the list using list_del(), we need to use the safe version of list_for_each_entry(). Fixes: 5e4e6c4d3ae0 ("interconnect: qcom: Add QCS404 interconnect provider driver") Reported-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Cc: <stable@vger.kernel.org> # v5.4 Link: https://lore.kernel.org/r/20191212075332.16202-4-georgi.djakov@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: qcom: sdm845: Walk the list safely on node removalGeorgi Djakov2019-12-121-2/+2
| | | | | | | | | | | | | As we will remove items off the list using list_del(), we need to use the safe version of list_for_each_entry(). Fixes: b5d2f741077a ("interconnect: qcom: Add sdm845 interconnect provider driver") Reported-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Cc: <stable@vger.kernel.org> # v5.3+ Link: https://lore.kernel.org/r/20191212075332.16202-3-georgi.djakov@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: qcom: Fix Kconfig indentationKrzysztof Kozlowski2019-12-121-7/+7
| | | | | | | | | | | Adjust indentation from spaces to tab (+optional two spaces) as in coding style with command like: $ sed -e 's/^ /\t/' -i */Kconfig Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Link: https://lore.kernel.org/r/20191212075332.16202-2-georgi.djakov@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Merge 5.4-rc7 into char-misc-nextGreg Kroah-Hartman2019-11-113-2/+8
|\ | | | | | | | | | | We need the char/misc driver fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * interconnect: Add locking in icc_set_tag()Georgi Djakov2019-10-201-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | We must ensure that the tag is not changed while we aggregate the requests. Currently the icc_set_tag() is not using any locks and this may cause the values to be aggregated incorrectly. Fix this by acquiring the icc_lock while we set the tag. Link: https://lore.kernel.org/lkml/20191018141750.17032-1-georgi.djakov@linaro.org/ Fixes: 127ab2cc5f19 ("interconnect: Add support for path tags") Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
| * interconnect: qcom: Fix icc_onecell_data allocationLeonard Crestez2019-10-202-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a struct with a trailing zero-length array of icc_node pointers but it's allocated as if it were a single array of icc_nodes instead. This allocates too much memory at probe time but shouldn't have any noticeable effect. Both sdm845 and qcs404 are affected. Fix by replacing kcalloc with kzalloc and using the "struct_size" macro. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Fixes: 5e4e6c4d3ae0 ("interconnect: qcom: Add QCS404 interconnect provider driver") Link: https://lore.kernel.org/linux-pm/a7360abb6561917e30bbfaa6084578449152bf1d.1569348056.git.leonard.crestez@nxp.com/ Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* | interconnect: qcom: add msm8974 driverBrian Masney2019-11-083-0/+795
|/ | | | | | | | | | | | | Add driver for the Qualcomm MSM8974 interconnect providers that support setting system bandwidth requirements between various network-on-chip fabrics. Signed-off-by: Brian Masney <masneyb@onstation.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20191024103054.9770-3-masneyb@onstation.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Link: https://lore.kernel.org/r/20191108125349.24191-3-georgi.djakov@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: qcom: Add BCM vote macro to headerJordan Crouse2019-08-201-18/+1
| | | | | | | | | | | | The macro to generate a Bus Controller Manager (BCM) TCS command is used by the interconnect driver but might also be interesting to other drivers that need to construct TCS commands for sub processors so move it out of the sdm845 specific file and into the header. Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Acked-by: Stephen Boyd <sboyd@kernel.org> Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: remove COMPILE_TEST from CONFIG_INTERCONNECT_QCOM_QCS404Mao Wenan2019-08-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | There is one compilation error when CONFIG_INTERCONNECT_QCOM_QCS404=y and CONFIG_INTERCONNECT_QCOM_SMD_RPM=y, as well as CONFIG_COMPILE_TEST=y, but CONFIG_QCOM_SMD_RPM is not set, logs as below: drivers/interconnect/qcom/smd-rpm.o: In function `qcom_icc_rpm_smd_send': smd-rpm.c:(.text+0xe4): undefined reference to `qcom_rpm_smd_write' Makefile:1071: recipe for target 'vmlinux' failed make: *** [vmlinux] Error 1 This is because INTERCONNECT_QCOM_QCS404 depends on QCOM_SMD_RPM || COMPILE_TEST. Here CONFIG_COMPILE_TEST=y, so CONFIG_INTERCONNECT_QCOM_SMD_RPM is selected. If CONFIG_QCOM_SMD_RPM is not set, then qcom_rpm_smd_write() is not defined, and compilation error happen. Fix this by removing COMPILE_TEST from CONFIG_INTERCONNECT_QCOM_QCS404. Fixes: 5e4e6c4d3ae0 ("interconnect: qcom: Add QCS404 interconnect provider driver") Signed-off-by: Mao Wenan <maowenan@huawei.com> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: Add QCS404 interconnect provider driverBjorn Andersson2019-08-133-0/+550
| | | | | | | | | | Add driver for the interconnect buses found in Qualcomm QCS404-based platforms. The topology consists of three NoCs that are controlled by a remote processor. This remote processor collects the aggregated bandwidth for each master-slave pairs. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: Add interconnect RPM over SMD driverGeorgi Djakov2019-08-134-0/+97
| | | | | | | | | | On some Qualcomm SoCs, there is a remote processor, which controls some of the Network-On-Chip interconnect resources. Other CPUs express their needs by communicating with this processor. Add a driver to handle communication with this remote processor. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: qcom: Add tagging and wake/sleep support for sdm845David Dai2019-08-131-31/+108
| | | | | | | | | | Add support for wake and sleep commands by using a tag to indicate whether or not the aggregate and set requests fall into execution state specific bucket. Signed-off-by: David Dai <daidavid1@codeaurora.org> Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add pre_aggregate() callbackGeorgi Djakov2019-08-131-0/+3
| | | | | | | | | | | | | Introduce an optional callback in interconnect provider drivers. It can be used for implementing actions, that need to be executed before the actual aggregation of the bandwidth requests has started. The benefit of this for now is that it will significantly simplify the code in provider drivers. Suggested-by: Evan Green <evgreen@chromium.org> Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Add support for path tagsGeorgi Djakov2019-08-132-2/+24
| | | | | | | | | | | | | | Consumers may have use cases with different bandwidth requirements based on the system or driver state. The consumer driver can append a specific tag to the path and pass this information to the interconnect platform driver to do the aggregation based on this state. Introduce icc_set_tag() function that will allow the consumers to append an optional tag to each path. The aggregation of these tagged paths is platform specific. Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner2019-05-212-0/+2
| | | | | | | | | | | | | | Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: convert to DEFINE_SHOW_ATTRIBUTEYangtao Li2019-04-061-12/+1
| | | | | | | Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code. Signed-off-by: Yangtao Li <tiny.windzz@gmail.com> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
* interconnect: Revert to previous config if any request failsGeorgi Djakov2019-01-221-2/+15
| | | | | | | | | | | | When consumers report their bandwidth needs with icc_set_bw(), it's possible that the requested amount of bandwidth is not available or just the new configuration fails to apply on some path. In this case revert to the previous configuration and propagate the error back to the consumers to let them know that bandwidth is not available, hardware is busy or whatever error is returned by the interconnect platform driver. Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: qcom: Add sdm845 interconnect provider driverDavid Dai2019-01-225-0/+862
| | | | | | | | | | Introduce Qualcomm SDM845 specific provider driver using the interconnect framework. Signed-off-by: David Dai <daidavid1@codeaurora.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: Add debugfs supportGeorgi Djakov2019-01-221-0/+70
| | | | | | | | | Add a functionality to provide information about the current constraints per each node and provider. Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: Allow endpoints translation via DTGeorgi Djakov2019-01-221-0/+149
| | | | | | | | | | | | | Currently we support only platform data for specifying the interconnect endpoints. As now the endpoints are hard-coded into the consumer driver this may lead to complications when a single driver is used by multiple SoCs, which may have different interconnect topology. To avoid cluttering the consumer drivers, introduce a translation function to help us get the board specific interconnect data from device-tree. Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* interconnect: Add generic on-chip interconnect APIGeorgi Djakov2019-01-223-0/+582
This patch introduces a new API to get requirements and configure the interconnect buses across the entire chipset to fit with the current demand. The API is using a consumer/provider-based model, where the providers are the interconnect buses and the consumers could be various drivers. The consumers request interconnect resources (path) between endpoints and set the desired constraints on this data flow path. The providers receive requests from consumers and aggregate these requests for all master-slave pairs on that path. Then the providers configure each node along the path to support a bandwidth that satisfies all bandwidth requests that cross through that node. The topology could be complicated and multi-tiered and is SoC specific. Reviewed-by: Evan Green <evgreen@chromium.org> Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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