linux-kernel - [PATCH V4 3/3] Revert "ACPI,PCI,IRQ: separate ISA penalty calculation"

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Date:   Wed, 19 Oct 2016 18:21:04 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     linux-acpi@...r.kernel.org, rjw@...ysocki.net, bhelgaas@...gle.com,
        ravikanth.nalla@....com, linux@...nbow-software.org,
        timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com,
        alex.williamson@...hat.com
Cc:     linux-pci@...r.kernel.org, agross@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, wim@....tudelft.nl,
        Sinan Kaya <okaya@...eaurora.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Lv Zheng <lv.zheng@...el.com>, linux-kernel@...r.kernel.org,
        devel@...ica.org
Subject: [PATCH V4 3/3] Revert "ACPI,PCI,IRQ: separate ISA penalty calculation"

This reverts commit f7eca374f000 ("ACPI,PCI,IRQ: separate ISA penalty
calculation") and commit 487cf917ed0d ("revert "ACPI, PCI, IRQ: remove
redundant code in acpi_irq_penalty_init()"").

Now that we understand the real issue (SCI and ISA penalty getting
calculated before ACPI start), there is no need for special handling
for ISA interrupts.

Let's try to simplify the code one more time to share code.

Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
---
 arch/x86/pci/acpi.c         |  1 -
 drivers/acpi/pci_link.c     | 44 +++++---------------------------------------
 include/acpi/acpi_drivers.h |  1 -
 3 files changed, 5 insertions(+), 41 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 3cd6983..b2a4e2a 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -396,7 +396,6 @@ int __init pci_acpi_init(void)
 		return -ENODEV;
 
 	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
-	acpi_irq_penalty_init();
 	pcibios_enable_irq = acpi_pci_irq_enable;
 	pcibios_disable_irq = acpi_pci_irq_disable;
 	x86_init.pci.init_irq = x86_init_noop;
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 294b190..dd14d78 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -478,7 +478,8 @@ static int acpi_irq_pci_sharing_penalty(int irq)
 		 * If a link is active, penalize its IRQ heavily
 		 * so we try to choose a different IRQ.
 		 */
-		if (link->irq.active && link->irq.active == irq)
+		if ((link->irq.active && link->irq.active == irq) &&
+				(link->irq.initialized == 1))
 			penalty += PIRQ_PENALTY_PCI_USING;
 
 		/*
@@ -501,45 +502,10 @@ static int acpi_irq_get_penalty(int irq)
 		penalty += sci_penalty;
 
 	if (irq < ACPI_MAX_ISA_IRQS)
-		return penalty + acpi_isa_irq_penalty[irq];
+		penalty += acpi_isa_irq_penalty[irq];
 
-	return penalty + acpi_irq_pci_sharing_penalty(irq);
-}
-
-int __init acpi_irq_penalty_init(void)
-{
-	struct acpi_pci_link *link;
-	int i;
-
-	/*
-	 * Update penalties to facilitate IRQ balancing.
-	 */
-	list_for_each_entry(link, &acpi_link_list, list) {
-
-		/*
-		 * reflect the possible and active irqs in the penalty table --
-		 * useful for breaking ties.
-		 */
-		if (link->irq.possible_count) {
-			int penalty =
-			    PIRQ_PENALTY_PCI_POSSIBLE /
-			    link->irq.possible_count;
-
-			for (i = 0; i < link->irq.possible_count; i++) {
-				if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS)
-					acpi_isa_irq_penalty[link->irq.
-							 possible[i]] +=
-					    penalty;
-			}
-
-		} else if (link->irq.active &&
-				(link->irq.active < ACPI_MAX_ISA_IRQS)) {
-			acpi_isa_irq_penalty[link->irq.active] +=
-			    PIRQ_PENALTY_PCI_POSSIBLE;
-		}
-	}
-
-	return 0;
+	penalty += acpi_irq_pci_sharing_penalty(irq);
+	return penalty;
 }
 
 static int acpi_irq_balance = -1;	/* 0: static, 1: balance */
diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h
index 29c6912..797ae2e 100644
--- a/include/acpi/acpi_drivers.h
+++ b/include/acpi/acpi_drivers.h
@@ -78,7 +78,6 @@
 
 /* ACPI PCI Interrupt Link (pci_link.c) */
 
-int acpi_irq_penalty_init(void);
 int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
 			       int *polarity, char **name);
 int acpi_pci_link_free_irq(acpi_handle handle);
-- 
1.9.1