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Commit 8d57d3ad authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Stop using __do_IRQ(). 



Invoke the desc->handle_irq directly in the top-level dispatch,
just like other sophisticated ports.

This will allow us to decrease the cost of the MSI queue dispatch.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3d0a721f

arch/sparc64/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -72,6 +72,10 @@ config ARCH_NO_VIRT_TO_BUS 
config OF

	def_bool y



config GENERIC_HARDIRQS_NO__DO_IRQ

	bool

	def_bool y



choice

	prompt "Kernel page size"

	default SPARC64_PAGE_SIZE_8KB

arch/sparc64/kernel/irq.c

+38 −47
Original line number Diff line number Diff line
@@ -257,8 +257,8 @@ struct irq_handler_data { 
	unsigned long	imap;



	void		(*pre_handler)(unsigned int, void *, void *);

	void		*pre_handler_arg1;

	void		*pre_handler_arg2;

	void		*arg1;

	void		*arg2;

};



#ifdef CONFIG_SMP
@@ -346,7 +346,7 @@ static void sun4u_irq_disable(unsigned int virt_irq) 
	}

}



static void sun4u_irq_end(unsigned int virt_irq)

static void sun4u_irq_eoi(unsigned int virt_irq)

{

	struct irq_handler_data *data = get_irq_chip_data(virt_irq);

	struct irq_desc *desc = irq_desc + virt_irq;
@@ -401,7 +401,7 @@ static void sun4v_irq_disable(unsigned int virt_irq) 
		       "err(%d)\n", ino, err);

}



static void sun4v_irq_end(unsigned int virt_irq)

static void sun4v_irq_eoi(unsigned int virt_irq)

{

	unsigned int ino = virt_irq_table[virt_irq].dev_ino;

	struct irq_desc *desc = irq_desc + virt_irq;
@@ -478,7 +478,7 @@ static void sun4v_virq_disable(unsigned int virt_irq) 
		       dev_handle, dev_ino, err);

}



static void sun4v_virq_end(unsigned int virt_irq)

static void sun4v_virq_eoi(unsigned int virt_irq)

{

	struct irq_desc *desc = irq_desc + virt_irq;

	unsigned long dev_handle, dev_ino;
@@ -498,33 +498,11 @@ static void sun4v_virq_end(unsigned int virt_irq) 
		       dev_handle, dev_ino, err);

}



static void run_pre_handler(unsigned int virt_irq)

{

	struct irq_handler_data *data = get_irq_chip_data(virt_irq);

	unsigned int ino;



	ino = virt_irq_table[virt_irq].dev_ino;

	if (likely(data->pre_handler)) {

		data->pre_handler(ino,

				  data->pre_handler_arg1,

				  data->pre_handler_arg2);

	}

}



static struct irq_chip sun4u_irq = {

	.typename	= "sun4u",

	.enable		= sun4u_irq_enable,

	.disable	= sun4u_irq_disable,

	.end		= sun4u_irq_end,

	.set_affinity	= sun4u_set_affinity,

};



static struct irq_chip sun4u_irq_ack = {

	.typename	= "sun4u+ack",

	.enable		= sun4u_irq_enable,

	.disable	= sun4u_irq_disable,

	.ack		= run_pre_handler,

	.end		= sun4u_irq_end,

	.eoi		= sun4u_irq_eoi,

	.set_affinity	= sun4u_set_affinity,

};
@@ -532,7 +510,7 @@ static struct irq_chip sun4v_irq = { 
	.typename	= "sun4v",

	.enable		= sun4v_irq_enable,

	.disable	= sun4v_irq_disable,

	.end		= sun4v_irq_end,

	.eoi		= sun4v_irq_eoi,

	.set_affinity	= sun4v_set_affinity,

};
@@ -540,31 +518,33 @@ static struct irq_chip sun4v_virq = { 
	.typename	= "vsun4v",

	.enable		= sun4v_virq_enable,

	.disable	= sun4v_virq_disable,

	.end		= sun4v_virq_end,

	.eoi		= sun4v_virq_eoi,

	.set_affinity	= sun4v_virt_set_affinity,

};



static void fastcall pre_flow_handler(unsigned int virt_irq,

				      struct irq_desc *desc)

{

	struct irq_handler_data *data = get_irq_chip_data(virt_irq);

	unsigned int ino = virt_irq_table[virt_irq].dev_ino;



	data->pre_handler(ino, data->arg1, data->arg2);



	handle_fasteoi_irq(virt_irq, desc);

}



void irq_install_pre_handler(int virt_irq,

			     void (*func)(unsigned int, void *, void *),

			     void *arg1, void *arg2)

{

	struct irq_handler_data *data = get_irq_chip_data(virt_irq);

	struct irq_chip *chip = get_irq_chip(virt_irq);



	if (WARN_ON(chip == &sun4v_irq || chip == &sun4v_virq)) {

		printk(KERN_ERR "IRQ: Trying to install pre-handler on "

		       "sun4v irq %u\n", virt_irq);

		return;

	}

	struct irq_desc *desc = irq_desc + virt_irq;



	data->pre_handler = func;

	data->pre_handler_arg1 = arg1;

	data->pre_handler_arg2 = arg2;



	if (chip == &sun4u_irq_ack)

		return;

	data->arg1 = arg1;

	data->arg2 = arg2;



	set_irq_chip(virt_irq, &sun4u_irq_ack);

	desc->handle_irq = pre_flow_handler;

}



unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
@@ -582,7 +562,10 @@ unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap) 
	if (!virt_irq) {

		virt_irq = virt_irq_alloc(0, ino);

		bucket_set_virt_irq(__pa(bucket), virt_irq);

		set_irq_chip(virt_irq, &sun4u_irq);

		set_irq_chip_and_handler_name(virt_irq,

					      &sun4u_irq,

					      handle_fasteoi_irq,

					      "IVEC");

	}



	data = get_irq_chip_data(virt_irq);
@@ -617,7 +600,9 @@ static unsigned int sun4v_build_common(unsigned long sysino, 
	if (!virt_irq) {

		virt_irq = virt_irq_alloc(0, sysino);

		bucket_set_virt_irq(__pa(bucket), virt_irq);

		set_irq_chip(virt_irq, chip);

		set_irq_chip_and_handler_name(virt_irq, chip,

					      handle_fasteoi_irq,

					      "IVEC");

	}



	data = get_irq_chip_data(virt_irq);
@@ -665,7 +650,10 @@ unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino) 


	virt_irq = virt_irq_alloc(devhandle, devino);

	bucket_set_virt_irq(__pa(bucket), virt_irq);

	set_irq_chip(virt_irq, &sun4v_virq);



	set_irq_chip_and_handler_name(virt_irq, &sun4v_virq,

				      handle_fasteoi_irq,

				      "IVEC");



	data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);

	if (unlikely(!data))
@@ -724,6 +712,7 @@ void handler_irq(int irq, struct pt_regs *regs) 
			     : "memory");



	while (bucket_pa) {

		struct irq_desc *desc;

		unsigned long next_pa;

		unsigned int virt_irq;
@@ -731,7 +720,9 @@ void handler_irq(int irq, struct pt_regs *regs) 
		virt_irq = bucket_get_virt_irq(bucket_pa);

		bucket_clear_chain_pa(bucket_pa);



		__do_IRQ(virt_irq);

		desc = irq_desc + virt_irq;



		desc->handle_irq(virt_irq, desc);



		bucket_pa = next_pa;

	}

arch/sparc64/kernel/pci_msi.c

+11 −3
Original line number Diff line number Diff line
@@ -28,8 +28,15 @@ static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie) 
		unsigned long msi;



		err = ops->dequeue_msi(pbm, msiqid, &head, &msi);

		if (likely(err > 0))

			__do_IRQ(pbm->msi_irq_table[msi - pbm->msi_first]);

		if (likely(err > 0)) {

			struct irq_desc *desc;

			unsigned int virt_irq;



			virt_irq = pbm->msi_irq_table[msi - pbm->msi_first];

			desc = irq_desc + virt_irq;



			desc->handle_irq(virt_irq, desc);

		}



		if (unlikely(err < 0))

			goto err_dequeue;
@@ -128,7 +135,8 @@ int sparc64_setup_msi_irq(unsigned int *virt_irq_p, 
	if (!*virt_irq_p)

		goto out_err;



	set_irq_chip(*virt_irq_p, &msi_irq);

	set_irq_chip_and_handler_name(*virt_irq_p, &msi_irq,

				      handle_simple_irq, "MSI");



	err = alloc_msi(pbm);

	if (unlikely(err < 0))