[PATCH v2 3/7] accel/qaic: Allocate an exact number of MSIs

[Jeffrey Hugo]

From: Youssef Samir <quic_yabdulra at quicinc.com>

Devices use 1 MSI vector for the MHI controller and as many vectors as
the DMA bridge channels on the device. During the probing of the
device, the driver allocates 32 MSI vectors, which is usually more
than what is needed for AIC100 devices, which is wasting resources.

Allocate only the needed number of MSI vectors per device.

Signed-off-by: Youssef Samir <quic_yabdulra at quicinc.com>
Reviewed-by: Troy Hanson <quic_thanson at quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo at quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo at quicinc.com>
Reviewed-by: Lizhi Hou <lizhi.hou at amd.com>
---
 drivers/accel/qaic/qaic_drv.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
index 81819b9ef8d4..6e9bed17b3f1 100644
--- a/drivers/accel/qaic/qaic_drv.c
+++ b/drivers/accel/qaic/qaic_drv.c
@@ -465,12 +465,13 @@ static int init_pci(struct qaic_device *qdev, struct pci_dev *pdev)
 
 static int init_msi(struct qaic_device *qdev, struct pci_dev *pdev)
 {
+	int irq_count = qdev->num_dbc + 1;
 	int mhi_irq;
 	int ret;
 	int i;
 
 	/* Managed release since we use pcim_enable_device */
-	ret = pci_alloc_irq_vectors(pdev, 32, 32, PCI_IRQ_MSI);
+	ret = pci_alloc_irq_vectors(pdev, irq_count, irq_count, PCI_IRQ_MSI);
 	if (ret == -ENOSPC) {
 		ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
 		if (ret < 0)
@@ -485,7 +486,8 @@ static int init_msi(struct qaic_device *qdev, struct pci_dev *pdev)
 		 * interrupted, it shouldn't race with itself.
 		 */
 		qdev->single_msi = true;
-		pci_info(pdev, "Allocating 32 MSIs failed, operating in 1 MSI mode. Performance may be impacted.\n");
+		pci_info(pdev, "Allocating %d MSIs failed, operating in 1 MSI mode. Performance may be impacted.\n",
+			 irq_count);
 	} else if (ret < 0) {
 		return ret;
 	}
-- 
2.34.1