[SCSI] bfa: Brocade BFA FC SCSI driver

Add new driver for Brocade Hardware

Signed-off-by: Jing Huang <huangj@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 214 insertions, 0 deletions

diff --git a/drivers/scsi/bfa/bfad_intr.c b/drivers/scsi/bfa/bfad_intr.c
new file mode 100644
index 00000000000..f104e029cac
--- /dev/null
+++ b/drivers/scsi/bfa/bfad_intr.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
+ * All rights reserved
+ * www.brocade.com
+ *
+ * Linux driver for Brocade Fibre Channel Host Bus Adapter.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License (GPL) Version 2 as
+ * published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "bfad_drv.h"
+#include "bfad_trcmod.h"
+
+BFA_TRC_FILE(LDRV, INTR);
+
+/**
+ *  bfa_isr BFA driver interrupt functions
+ */
+irqreturn_t bfad_intx(int irq, void *dev_id);
+static int msix_disable;
+module_param(msix_disable, int, S_IRUGO | S_IWUSR);
+/**
+ * Line based interrupt handler.
+ */
+irqreturn_t
+bfad_intx(int irq, void *dev_id)
+{
+	struct bfad_s         *bfad = dev_id;
+	struct list_head         doneq;
+	unsigned long   flags;
+	bfa_boolean_t rc;
+
+	spin_lock_irqsave(&bfad->bfad_lock, flags);
+	rc = bfa_intx(&bfad->bfa);
+	if (!rc) {
+		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+		return IRQ_NONE;
+	}
+
+	bfa_comp_deq(&bfad->bfa, &doneq);
+	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
+	if (!list_empty(&doneq)) {
+		bfa_comp_process(&bfad->bfa, &doneq);
+
+		spin_lock_irqsave(&bfad->bfad_lock, flags);
+		bfa_comp_free(&bfad->bfa, &doneq);
+		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+		bfa_trc_fp(bfad, irq);
+	}
+
+	return IRQ_HANDLED;
+
+}
+
+static irqreturn_t
+bfad_msix(int irq, void *dev_id)
+{
+	struct bfad_msix_s *vec = dev_id;
+	struct bfad_s *bfad = vec->bfad;
+	struct list_head doneq;
+	unsigned long   flags;
+
+	spin_lock_irqsave(&bfad->bfad_lock, flags);
+
+	bfa_msix(&bfad->bfa, vec->msix.entry);
+	bfa_comp_deq(&bfad->bfa, &doneq);
+	spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+
+	if (!list_empty(&doneq)) {
+		bfa_comp_process(&bfad->bfa, &doneq);
+
+		spin_lock_irqsave(&bfad->bfad_lock, flags);
+		bfa_comp_free(&bfad->bfa, &doneq);
+		spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * Initialize the MSIX entry table.
+ */
+static void
+bfad_init_msix_entry(struct bfad_s *bfad, struct msix_entry *msix_entries,
+			 int mask, int max_bit)
+{
+	int             i;
+	int             match = 0x00000001;
+
+	for (i = 0, bfad->nvec = 0; i < MAX_MSIX_ENTRY; i++) {
+		if (mask & match) {
+			bfad->msix_tab[bfad->nvec].msix.entry = i;
+			bfad->msix_tab[bfad->nvec].bfad = bfad;
+			msix_entries[bfad->nvec].entry = i;
+			bfad->nvec++;
+		}
+
+		match <<= 1;
+	}
+
+}
+
+int
+bfad_install_msix_handler(struct bfad_s *bfad)
+{
+	int             i, error = 0;
+
+	for (i = 0; i < bfad->nvec; i++) {
+		error = request_irq(bfad->msix_tab[i].msix.vector,
+				    (irq_handler_t) bfad_msix, 0,
+				    BFAD_DRIVER_NAME, &bfad->msix_tab[i]);
+		bfa_trc(bfad, i);
+		bfa_trc(bfad, bfad->msix_tab[i].msix.vector);
+		if (error) {
+			int             j;
+
+			for (j = 0; j < i; j++)
+				free_irq(bfad->msix_tab[j].msix.vector,
+						&bfad->msix_tab[j]);
+
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * Setup MSIX based interrupt.
+ */
+int
+bfad_setup_intr(struct bfad_s *bfad)
+{
+	int error = 0;
+	u32 mask = 0, i, num_bit = 0, max_bit = 0;
+	struct msix_entry msix_entries[MAX_MSIX_ENTRY];
+
+	/* Call BFA to get the msix map for this PCI function.  */
+	bfa_msix_getvecs(&bfad->bfa, &mask, &num_bit, &max_bit);
+
+	/* Set up the msix entry table */
+	bfad_init_msix_entry(bfad, msix_entries, mask, max_bit);
+
+	if (!msix_disable) {
+		error = pci_enable_msix(bfad->pcidev, msix_entries, bfad->nvec);
+		if (error) {
+			/*
+			 * Only error number of vector is available.
+			 * We don't have a mechanism to map multiple
+			 * interrupts into one vector, so even if we
+			 * can try to request less vectors, we don't
+			 * know how to associate interrupt events to
+			 *  vectors. Linux doesn't dupicate vectors
+			 * in the MSIX table for this case.
+			 */
+
+			printk(KERN_WARNING "bfad%d: "
+				"pci_enable_msix failed (%d),"
+				" use line based.\n", bfad->inst_no, error);
+
+			goto line_based;
+		}
+
+		/* Save the vectors */
+		for (i = 0; i < bfad->nvec; i++) {
+			bfa_trc(bfad, msix_entries[i].vector);
+			bfad->msix_tab[i].msix.vector = msix_entries[i].vector;
+		}
+
+		bfa_msix_init(&bfad->bfa, bfad->nvec);
+
+		bfad->bfad_flags |= BFAD_MSIX_ON;
+
+		return error;
+	}
+
+line_based:
+	error = 0;
+	if (request_irq
+	    (bfad->pcidev->irq, (irq_handler_t) bfad_intx, BFAD_IRQ_FLAGS,
+	     BFAD_DRIVER_NAME, bfad) != 0) {
+		/* Enable interrupt handler failed */
+		return 1;
+	}
+
+	return error;
+}
+
+void
+bfad_remove_intr(struct bfad_s *bfad)
+{
+	int             i;
+
+	if (bfad->bfad_flags & BFAD_MSIX_ON) {
+		for (i = 0; i < bfad->nvec; i++)
+			free_irq(bfad->msix_tab[i].msix.vector,
+					&bfad->msix_tab[i]);
+
+		pci_disable_msix(bfad->pcidev);
+		bfad->bfad_flags &= ~BFAD_MSIX_ON;
+	} else {
+		free_irq(bfad->pcidev->irq, bfad);
+	}
+}
+
+