| Message ID | 20240829110436.46052-4-towinchenmi@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add AIC support for A7-A11 SoCs | expand |
On Thu, Aug 29 2024 at 19:02, Nick Chan wrote: > > + if (irqc->info.local_fast_ipi) > + static_branch_enable(&use_local_fast_ipi); > + else > + static_branch_disable(&use_local_fast_ipi); As you define the key to be true by default there is no point to enable the branch some more. Copy & pasta ... Thanks, tglx
On 29/8/2024 19:02, Nick Chan wrote: > Starting with the A11 (T8015) SoC, Apple began using arm64 sysregs for > fast IPIs. However, on A11, there is no such things as "Local" fast IPIs, > as the SYS_IMP_APL_IPI_RR_LOCAL_EL1 register does not seem to exist. > > Add a new feature level, used by the compatible "apple,t8015-aic", > controlled by a static branch key named use_local_fast_ipi. When > use_fast_ipi is true and use_local_fast_ipi is false, fast IPIs are used > but all IPIs goes through the register SYS_IMP_APL_IPI_RR_GLOBAL_EL1, as > "global" IPIs. > > Signed-off-by: Nick Chan <towinchenmi@gmail.com> > --- > drivers/irqchip/irq-apple-aic.c | 25 ++++++++++++++++++++++++- > 1 file changed, 24 insertions(+), 1 deletion(-) > > diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c > index 626aaeafa96c..1640074af2e1 100644 > --- a/drivers/irqchip/irq-apple-aic.c > +++ b/drivers/irqchip/irq-apple-aic.c > @@ -236,6 +236,8 @@ enum fiq_hwirq { > > /* True if UNCORE/UNCORE2 and Sn_... IPI registers are present and used (A11+) */ > static DEFINE_STATIC_KEY_TRUE(use_fast_ipi); > +/* True if SYS_IMP_APL_IPI_RR_LOCAL_EL1 exists (M1+) */ > +static DEFINE_STATIC_KEY_TRUE(use_local_fast_ipi); > > struct aic_info { > int version; > @@ -253,6 +255,7 @@ struct aic_info { > > /* Features */ > bool fast_ipi; > + bool local_fast_ipi; > }; > > static const struct aic_info aic1_info __initconst = { > @@ -271,6 +274,16 @@ static const struct aic_info aic1_fipi_info __initconst = { > .fast_ipi = true, > }; > > +static const struct aic_info aic1_local_fipi_info __initconst = { > + .version = 1, > + > + .event = AIC_EVENT, > + .target_cpu = AIC_TARGET_CPU, > + > + .fast_ipi = true, > + .local_fast_ipi = true, > +}; > + > static const struct aic_info aic2_info __initconst = { This patch is incorrectly disabling local fast IPI on aic2, it will be corrected in v2. > .version = 2, > > @@ -282,6 +295,10 @@ static const struct aic_info aic2_info __initconst = { > static const struct of_device_id aic_info_match[] = { > { > .compatible = "apple,t8103-aic", > + .data = &aic1_local_fipi_info, > + }, > + { > + .compatible = "apple,t8015-aic", > .data = &aic1_fipi_info, > }, > { > @@ -748,7 +765,8 @@ static void aic_ipi_send_fast(int cpu) > u64 cluster = MPIDR_CLUSTER(mpidr); > u64 idx = MPIDR_CPU(mpidr); > > - if (MPIDR_CLUSTER(my_mpidr) == cluster) > + if (static_branch_likely(&use_local_fast_ipi) && > + MPIDR_CLUSTER(my_mpidr) == cluster) > write_sysreg_s(FIELD_PREP(IPI_RR_CPU, idx), > SYS_IMP_APL_IPI_RR_LOCAL_EL1); > else > @@ -992,6 +1010,11 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p > else > static_branch_disable(&use_fast_ipi); > > + if (irqc->info.local_fast_ipi) > + static_branch_enable(&use_local_fast_ipi); > + else > + static_branch_disable(&use_local_fast_ipi); > + > irqc->info.die_stride = off - start_off; > > irqc->hw_domain = irq_domain_create_tree(of_node_to_fwnode(node), Nick Chan
diff --git a/drivers/irqchip/irq-apple-aic.c b/drivers/irqchip/irq-apple-aic.c index 626aaeafa96c..1640074af2e1 100644 --- a/drivers/irqchip/irq-apple-aic.c +++ b/drivers/irqchip/irq-apple-aic.c @@ -236,6 +236,8 @@ enum fiq_hwirq { /* True if UNCORE/UNCORE2 and Sn_... IPI registers are present and used (A11+) */ static DEFINE_STATIC_KEY_TRUE(use_fast_ipi); +/* True if SYS_IMP_APL_IPI_RR_LOCAL_EL1 exists (M1+) */ +static DEFINE_STATIC_KEY_TRUE(use_local_fast_ipi); struct aic_info { int version; @@ -253,6 +255,7 @@ struct aic_info { /* Features */ bool fast_ipi; + bool local_fast_ipi; }; static const struct aic_info aic1_info __initconst = { @@ -271,6 +274,16 @@ static const struct aic_info aic1_fipi_info __initconst = { .fast_ipi = true, }; +static const struct aic_info aic1_local_fipi_info __initconst = { + .version = 1, + + .event = AIC_EVENT, + .target_cpu = AIC_TARGET_CPU, + + .fast_ipi = true, + .local_fast_ipi = true, +}; + static const struct aic_info aic2_info __initconst = { .version = 2, @@ -282,6 +295,10 @@ static const struct aic_info aic2_info __initconst = { static const struct of_device_id aic_info_match[] = { { .compatible = "apple,t8103-aic", + .data = &aic1_local_fipi_info, + }, + { + .compatible = "apple,t8015-aic", .data = &aic1_fipi_info, }, { @@ -748,7 +765,8 @@ static void aic_ipi_send_fast(int cpu) u64 cluster = MPIDR_CLUSTER(mpidr); u64 idx = MPIDR_CPU(mpidr); - if (MPIDR_CLUSTER(my_mpidr) == cluster) + if (static_branch_likely(&use_local_fast_ipi) && + MPIDR_CLUSTER(my_mpidr) == cluster) write_sysreg_s(FIELD_PREP(IPI_RR_CPU, idx), SYS_IMP_APL_IPI_RR_LOCAL_EL1); else @@ -992,6 +1010,11 @@ static int __init aic_of_ic_init(struct device_node *node, struct device_node *p else static_branch_disable(&use_fast_ipi); + if (irqc->info.local_fast_ipi) + static_branch_enable(&use_local_fast_ipi); + else + static_branch_disable(&use_local_fast_ipi); + irqc->info.die_stride = off - start_off; irqc->hw_domain = irq_domain_create_tree(of_node_to_fwnode(node),
Starting with the A11 (T8015) SoC, Apple began using arm64 sysregs for fast IPIs. However, on A11, there is no such things as "Local" fast IPIs, as the SYS_IMP_APL_IPI_RR_LOCAL_EL1 register does not seem to exist. Add a new feature level, used by the compatible "apple,t8015-aic", controlled by a static branch key named use_local_fast_ipi. When use_fast_ipi is true and use_local_fast_ipi is false, fast IPIs are used but all IPIs goes through the register SYS_IMP_APL_IPI_RR_GLOBAL_EL1, as "global" IPIs. Signed-off-by: Nick Chan <towinchenmi@gmail.com> --- drivers/irqchip/irq-apple-aic.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-)