linux-kernel - [PATCH RFC 70/77] vmci: Update MSI/MSI-X interrupts enablement code

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Message-Id: <654a7884b9ad6fbe777d00bb0a226010e421b3b9.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:49:26 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Tejun Heo <tj@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy King <acking@...are.com>, Jon Mason <jon.mason@...el.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	linux-pci@...r.kernel.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, linux390@...ibm.com,
	linux-s390@...r.kernel.org, x86@...nel.org,
	linux-ide@...r.kernel.org, iss_storagedev@...com,
	linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net,
	linux-driver@...gic.com,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	"VMware, Inc." <pv-drivers@...are.com>, linux-scsi@...r.kernel.org
Subject: [PATCH RFC 70/77] vmci: Update MSI/MSI-X interrupts enablement code

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
---
 drivers/misc/vmw_vmci/vmci_guest.c |   22 +++++++++++++++-------
 1 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
index b3a2b76..af5caf8 100644
--- a/drivers/misc/vmw_vmci/vmci_guest.c
+++ b/drivers/misc/vmw_vmci/vmci_guest.c
@@ -377,19 +377,27 @@ static int vmci_enable_msix(struct pci_dev *pdev,
 {
 	int i;
 	int result;
+	int nvec;
 
-	for (i = 0; i < VMCI_MAX_INTRS; ++i) {
+	result = pci_msix_table_size(pdev);
+	if (result < 0)
+		return result;
+
+	nvec = min(result, VMCI_MAX_INTRS);
+	if (nvec < VMCI_MAX_INTRS)
+		nvec = 1;
+
+	for (i = 0; i < nvec; ++i) {
 		vmci_dev->msix_entries[i].entry = i;
 		vmci_dev->msix_entries[i].vector = i;
 	}
 
-	result = pci_enable_msix(pdev, vmci_dev->msix_entries, VMCI_MAX_INTRS);
-	if (result == 0)
-		vmci_dev->exclusive_vectors = true;
-	else if (result > 0)
-		result = pci_enable_msix(pdev, vmci_dev->msix_entries, 1);
+	result = pci_enable_msix(pdev, vmci_dev->msix_entries, nvec);
+	if (result)
+		return result;
 
-	return result;
+	vmci_dev->exclusive_vectors = true;
+	return 0;
 }
 
 /*
-- 
1.7.7.6

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