powerpc/xics: Add icp_native_cause_ipi_rm (ec13e9b6) · Commits · 戴 / test

Function to cause an IPI by directly updating the MFFR register in the XICS. The function is meant for real-mode callers since they cannot use the smp_ops->cause_ipi function which uses an ioremapped address. Normal usage is for the the KVM real mode code to set the IPI message using smp_muxed_ipi_message_pass and then invoke icp_native_cause_ipi_rm to cause the actual IPI. The function requires kvm_hstate.xics_phys to have been initialized with the physical address of XICS. Signed-off-by:

Suresh Warrier <warrier@linux.vnet.ibm.com> Acked-by:

Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:

Paul Mackerras <paulus@samba.org>

arch/powerpc/include/asm/xics.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@
		#ifdef CONFIG_PPC_ICP_NATIVE
		extern int icp_native_init(void);
		extern void icp_native_flush_interrupt(void);
		extern void icp_native_cause_ipi_rm(int cpu);
		#else
		static inline int icp_native_init(void) { return -ENODEV; }
		#endif

arch/powerpc/sysdev/xics/icp-native.c

+21 −0

Original line number	Diff line number	Diff line
		@@ -159,6 +159,27 @@ static void icp_native_cause_ipi(int cpu, unsigned long data)
		icp_native_set_qirr(cpu, IPI_PRIORITY);
		}

		#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
		void icp_native_cause_ipi_rm(int cpu)
		{
		/*
		* Currently not used to send IPIs to another CPU
		* on the same core. Only caller is KVM real mode.
		* Need the physical address of the XICS to be
		* previously saved in kvm_hstate in the paca.
		*/
		unsigned long xics_phys;

		/*
		* Just like the cause_ipi functions, it is required to
		* include a full barrier (out8 includes a sync) before
		* causing the IPI.
		*/
		xics_phys = paca[cpu].kvm_hstate.xics_phys;
		out_rm8((u8 *)(xics_phys + XICS_MFRR), IPI_PRIORITY);
		}
		#endif

		/*
		* Called when an interrupt is received on an off-line CPU to
		* clear the interrupt, so that the CPU can go back to nap mode.

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