[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>
diff --git a/drivers/scsi/bfa/bfad_intr.c b/drivers/scsi/bfa/bfad_intr.c
new file mode 100644
index 0000000..f104e02
--- /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);
+ }
+}
+
+