linux-kernel - [PATCH RFC 37/77] ipr: Update MSI/MSI-X interrupts enablement code

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Message-Id: <5bc4414bf44d7ded72c38333225b9057b3427869.1380703263.git.agordeev@redhat.com>
Date:	Wed,  2 Oct 2013 12:48:53 +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 37/77] ipr: 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/scsi/ipr.c |   46 +++++++++++++++++++++++-----------------------
 1 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 762a93e..86ed0a2 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -9247,45 +9247,45 @@ static int ipr_enable_msix(struct ipr_ioa_cfg *ioa_cfg)
 	struct msix_entry entries[IPR_MAX_MSIX_VECTORS];
 	int i, err, vectors;
 
-	for (i = 0; i < ARRAY_SIZE(entries); ++i)
-		entries[i].entry = i;
+	err = pci_msix_table_size(ioa_cfg->pdev);
+	if (err < 0)
+		return err;
 
-	vectors = ipr_number_of_msix;
+	vectors = min_t(int, err, ipr_number_of_msix);
 
-	while ((err = pci_enable_msix(ioa_cfg->pdev, entries, vectors)) > 0)
-			vectors = err;
+	BUG_ON(vectors > ARRAY_SIZE(entries));
+	for (i = 0; i < vectors; ++i)
+		entries[i].entry = i;
 
-	if (err < 0)
+	err = pci_enable_msix(ioa_cfg->pdev, entries, vectors);
+	if (err)
 		return err;
 
-	if (!err) {
-		for (i = 0; i < vectors; i++)
-			ioa_cfg->vectors_info[i].vec = entries[i].vector;
-		ioa_cfg->nvectors = vectors;
-	}
+	for (i = 0; i < vectors; i++)
+		ioa_cfg->vectors_info[i].vec = entries[i].vector;
+	ioa_cfg->nvectors = vectors;
 
-	return err;
+	return 0;
 }
 
 static int ipr_enable_msi(struct ipr_ioa_cfg *ioa_cfg)
 {
 	int i, err, vectors;
 
-	vectors = ipr_number_of_msix;
-
-	while ((err = pci_enable_msi_block(ioa_cfg->pdev, vectors)) > 0)
-			vectors = err;
-
+	err = pci_get_msi_cap(ioa_cfg->pdev);
 	if (err < 0)
 		return err;
 
-	if (!err) {
-		for (i = 0; i < vectors; i++)
-			ioa_cfg->vectors_info[i].vec = ioa_cfg->pdev->irq + i;
-		ioa_cfg->nvectors = vectors;
-	}
+	vectors = min_t(int, err, ipr_number_of_msix);
+	err = pci_enable_msi_block(ioa_cfg->pdev, vectors);
+	if (err)
+		return err;
+
+	for (i = 0; i < vectors; i++)
+		ioa_cfg->vectors_info[i].vec = ioa_cfg->pdev->irq + i;
+	ioa_cfg->nvectors = vectors;
 
-	return err;
+	return 0;
 }
 
 static void name_msi_vectors(struct ipr_ioa_cfg *ioa_cfg)
-- 
1.7.7.6

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