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ccd207ec84
Currently, only a single waitqueue context exists in the driver. Multi-waitqueue mechanism is added in firmware to support the case, when multiple VMs make SMC calls or single VM making multiple calls on same CPU. Enhance the driver to support multiple waitqueue when support is present in the firmware. When VMs make a SMC call, firmware allocates a waitqueue context, assuming the SMC call to be a blocking call. The SMC calls that cannot acquire resources, while execution in firmware, are returned to sleep in the calling VM. When the resource becomes available in the firmware, the VM gets notified to wake the sleeping thread and resume SMC call. The current qcom_scm driver supports single waitqueue as the old firmwares support only single waitqueue with waitqueue id zero. Multi-waitqueue mechanism is added in firmware starting SM8650 to support the case when multiple VMs make SMC calls or single VM making multiple calls on same CPU. To enable this support in qcom_scm driver, add support for handling multiple waitqueues. For instance, SM8650 firmware can allocate two such waitq contexts, so the driver needs to implement two waitqueue contexts. For a generalized approach, the number of supported waitqueues can be queried from the firmware using a SMC call. Introduce qcom_scm_query_waitq_count to get the number of waitqueue contexts supported by the firmware and allocate “N” unique waitqueue contexts with a dynamic sized array where each unique wq_ctx is associated with a struct completion variable for easy lookup. Older targets which support only a single waitqueue, may return an error for qcom_scm_query_waitq_count, set the wq_cnt to one for such failures. Reviewed-by: Bartosz Golaszewski <brgl@kernel.org> Signed-off-by: Unnathi Chalicheemala <unnathi.chalicheemala@oss.qualcomm.com> Signed-off-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com> Reviewed-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com> Link: https://lore.kernel.org/r/20251217-multi_waitq_scm-v11-2-f21e50e792b8@oss.qualcomm.com Signed-off-by: Bjorn Andersson <andersson@kernel.org> |
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| arm_ffa | ||
| arm_scmi | ||
| broadcom | ||
| cirrus | ||
| efi | ||
| imx | ||
| meson | ||
| microchip | ||
| psci | ||
| qcom | ||
| samsung | ||
| smccc | ||
| tegra | ||
| xilinx | ||
| arm_scpi.c | ||
| arm_sdei.c | ||
| dmi-id.c | ||
| dmi-sysfs.c | ||
| dmi_scan.c | ||
| edd.c | ||
| iscsi_ibft.c | ||
| iscsi_ibft_find.c | ||
| Kconfig | ||
| Makefile | ||
| memmap.c | ||
| mtk-adsp-ipc.c | ||
| qemu_fw_cfg.c | ||
| raspberrypi.c | ||
| stratix10-rsu.c | ||
| stratix10-svc.c | ||
| sysfb.c | ||
| sysfb_simplefb.c | ||
| thead,th1520-aon.c | ||
| ti_sci.c | ||
| ti_sci.h | ||
| trusted_foundations.c | ||
| turris-mox-rwtm.c | ||