Messages in this thread | | | From | Anup Patel <> | Date | Wed, 21 Sep 2022 17:17:54 +0530 | Subject | Re: [PATCH v9 0/7] RISC-V IPI Improvements |
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Hi Marc,
On Sat, Sep 3, 2022 at 9:43 PM Anup Patel <apatel@ventanamicro.com> wrote: > > This series aims to improve IPI support in Linux RISC-V in following ways: > 1) Treat IPIs as normal per-CPU interrupts instead of having custom RISC-V > specific hooks. This also makes Linux RISC-V IPI support aligned with > other architectures. > 2) Remote TLB flushes and icache flushes should prefer local IPIs instead > of SBI calls whenever we have specialized hardware (such as RISC-V AIA > IMSIC and RISC-V SWI) which allows S-mode software to directly inject > IPIs without any assistance from M-mode runtime firmware. > > These patches were originally part of the "Linux RISC-V ACLINT Support" > series but this now a separate series so that it can be merged independently > of the "Linux RISC-V ACLINT Support" series. > (Refer, https://lore.kernel.org/lkml/20211007123632.697666-1-anup.patel@wdc.com/) > > These patches are also a preparatory patches for the up-coming: > 1) Linux RISC-V AIA support > 2) Linux RISC-V SWI support > > These patches can also be found in riscv_ipi_imp_v9 branch at: > https://github.com/avpatel/linux.git > > Changes since v8: > - Rebased on Linux-6.0-rc3 > - Use dummy percpu data as parameter for request_percpu_irq() in PATCH4. > > Changes since v7: > - Rebased on Linux-6.0-rc1 > - Use atomic operations to track per-CPU pending and enabled IPIs in PATCH3. > (Note: this is inspired from IPI muxing implemented in > drivers/irqchip/irq-apple-aic.c) > - Made "struct ipi_mux_ops" (added by PATCH3) flexible so that > drivers/irqchip/irq-apple-aic.c can adopt it in future. > > Changes since v6: > - Rebased on Linux-5.19-rc7 > - Added documentation for struct ipi_mux_ops in PATCH3 > - Dropped dummy irq_mask()/unmask() in PATCH3 > - Added const for "ipi_mux_chip" in PATCH3 > - Removed "type" initialization from ipi_mux_domain_alloc() in PATCH3 > - Dropped translate() from "ipi_mux_domain_ops" in PATCH3 > - Improved barrier documentation in ipi_mux_process() of PATCH3 > - Added percpu check in ipi_mux_create() for parent_virq of PATCH3 > - Added nr_ipi parameter in ipi_mux_create() of PATCH3 > > Changes since v5: > - Rebased on Linux-5.18-rc3 > - Used kernel doc style in PATCH3 > - Removed redundant loop in ipi_mux_process() of PATCH3 > - Removed "RISC-V" prefix form ipi_mux_chip.name of PATCH3 > - Removed use of "this patch" in PATCH3 commit description > - Addressed few other nit comments in PATCH3 > > Changes since v4: > - Rebased on Linux-5.17 > - Includes new PATCH3 which adds mechanism to multiplex a single HW IPI > > Changes since v3: > - Rebased on Linux-5.17-rc6 > - Updated PATCH2 to not export riscv_set_intc_hwnode_fn() > - Simplified riscv_intc_hwnode() in PATCH2 > > Changes since v2: > - Rebased on Linux-5.17-rc4 > - Updated PATCH2 to not create synthetic INTC fwnode and instead provide > a function which allows drivers to directly discover INTC fwnode > > Changes since v1: > - Use synthetic fwnode for INTC instead of irq_set_default_host() in PATCH2 > > Anup Patel (7): > RISC-V: Clear SIP bit only when using SBI IPI operations > irqchip/riscv-intc: Allow drivers to directly discover INTC hwnode > genirq: Add mechanism to multiplex a single HW IPI > RISC-V: Treat IPIs as normal Linux IRQs > RISC-V: Allow marking IPIs as suitable for remote FENCEs > RISC-V: Use IPIs for remote TLB flush when possible > RISC-V: Use IPIs for remote icache flush when possible
Friendly, ping ?
Regards, Anup
> > arch/riscv/Kconfig | 2 + > arch/riscv/include/asm/irq.h | 4 + > arch/riscv/include/asm/sbi.h | 7 + > arch/riscv/include/asm/smp.h | 49 ++++-- > arch/riscv/kernel/Makefile | 1 + > arch/riscv/kernel/cpu-hotplug.c | 3 +- > arch/riscv/kernel/irq.c | 21 ++- > arch/riscv/kernel/sbi-ipi.c | 60 ++++++++ > arch/riscv/kernel/sbi.c | 11 -- > arch/riscv/kernel/smp.c | 166 ++++++++++---------- > arch/riscv/kernel/smpboot.c | 5 +- > arch/riscv/mm/cacheflush.c | 5 +- > arch/riscv/mm/tlbflush.c | 93 ++++++++++-- > drivers/clocksource/timer-clint.c | 42 +++-- > drivers/irqchip/irq-riscv-intc.c | 60 ++++---- > include/linux/irq.h | 18 +++ > kernel/irq/Kconfig | 5 + > kernel/irq/Makefile | 1 + > kernel/irq/ipi-mux.c | 244 ++++++++++++++++++++++++++++++ > 19 files changed, 630 insertions(+), 167 deletions(-) > create mode 100644 arch/riscv/kernel/sbi-ipi.c > create mode 100644 kernel/irq/ipi-mux.c > > -- > 2.34.1 >
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