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Subject[PATCH 1/6] arcmsr: use pci_alloc_irq_vectors
Date
Switch the arcmsr driver to use pci_alloc_irq_vectors.  We need to two
calls to pci_alloc_irq_vectors as arcmsr only supports multiple MSI-X
vectors, but not multiple MSI vectors.

Otherwise this cleans up a lot of cruft and allows to use a common
request_irq loop for irq types, which happens to only iterate over a
single line in the non MSI-X case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/scsi/arcmsr/arcmsr.h | 5 +--
drivers/scsi/arcmsr/arcmsr_hba.c | 82 ++++++++++++++++------------------------
2 files changed, 33 insertions(+), 54 deletions(-)

diff --git a/drivers/scsi/arcmsr/arcmsr.h b/drivers/scsi/arcmsr/arcmsr.h
index cf99f8c..a254b32 100644
--- a/drivers/scsi/arcmsr/arcmsr.h
+++ b/drivers/scsi/arcmsr/arcmsr.h
@@ -629,7 +629,6 @@ struct AdapterControlBlock
struct pci_dev * pdev;
struct Scsi_Host * host;
unsigned long vir2phy_offset;
- struct msix_entry entries[ARCMST_NUM_MSIX_VECTORS];
/* Offset is used in making arc cdb physical to virtual calculations */
uint32_t outbound_int_enable;
uint32_t cdb_phyaddr_hi32;
@@ -671,8 +670,6 @@ struct AdapterControlBlock
/* iop init */
#define ACB_F_ABORT 0x0200
#define ACB_F_FIRMWARE_TRAP 0x0400
- #define ACB_F_MSI_ENABLED 0x1000
- #define ACB_F_MSIX_ENABLED 0x2000
struct CommandControlBlock * pccb_pool[ARCMSR_MAX_FREECCB_NUM];
/* used for memory free */
struct list_head ccb_free_list;
@@ -725,7 +722,7 @@ struct AdapterControlBlock
atomic_t rq_map_token;
atomic_t ante_token_value;
uint32_t maxOutstanding;
- int msix_vector_count;
+ int vector_count;
};/* HW_DEVICE_EXTENSION */
/*
*******************************************************************************
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 7640498..a267327 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -720,51 +720,39 @@ static void arcmsr_message_isr_bh_fn(struct work_struct *work)
static int
arcmsr_request_irq(struct pci_dev *pdev, struct AdapterControlBlock *acb)
{
- int i, j, r;
- struct msix_entry entries[ARCMST_NUM_MSIX_VECTORS];
-
- for (i = 0; i < ARCMST_NUM_MSIX_VECTORS; i++)
- entries[i].entry = i;
- r = pci_enable_msix_range(pdev, entries, 1, ARCMST_NUM_MSIX_VECTORS);
- if (r < 0)
- goto msi_int;
- acb->msix_vector_count = r;
- for (i = 0; i < r; i++) {
- if (request_irq(entries[i].vector,
- arcmsr_do_interrupt, 0, "arcmsr", acb)) {
+ unsigned long flags;
+ int nvec, i;
+
+ nvec = pci_alloc_irq_vectors(pdev, 1, ARCMST_NUM_MSIX_VECTORS,
+ PCI_IRQ_MSIX);
+ if (nvec > 0) {
+ pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no);
+ flags = 0;
+ } else {
+ nvec = pci_alloc_irq_vectors(pdev, 1, 1,
+ PCI_IRQ_MSI | PCI_IRQ_LEGACY);
+ if (nvec < 1)
+ return FAILED;
+
+ flags = IRQF_SHARED;
+ }
+
+ acb->vector_count = nvec;
+ for (i = 0; i < nvec; i++) {
+ if (request_irq(pci_irq_vector(pdev, i), arcmsr_do_interrupt,
+ flags, "arcmsr", acb)) {
pr_warn("arcmsr%d: request_irq =%d failed!\n",
- acb->host->host_no, entries[i].vector);
- for (j = 0 ; j < i ; j++)
- free_irq(entries[j].vector, acb);
- pci_disable_msix(pdev);
- goto msi_int;
+ acb->host->host_no, pci_irq_vector(pdev, i));
+ goto out_free_irq;
}
- acb->entries[i] = entries[i];
- }
- acb->acb_flags |= ACB_F_MSIX_ENABLED;
- pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no);
- return SUCCESS;
-msi_int:
- if (pci_enable_msi_exact(pdev, 1) < 0)
- goto legacy_int;
- if (request_irq(pdev->irq, arcmsr_do_interrupt,
- IRQF_SHARED, "arcmsr", acb)) {
- pr_warn("arcmsr%d: request_irq =%d failed!\n",
- acb->host->host_no, pdev->irq);
- pci_disable_msi(pdev);
- goto legacy_int;
- }
- acb->acb_flags |= ACB_F_MSI_ENABLED;
- pr_info("arcmsr%d: msi enabled\n", acb->host->host_no);
- return SUCCESS;
-legacy_int:
- if (request_irq(pdev->irq, arcmsr_do_interrupt,
- IRQF_SHARED, "arcmsr", acb)) {
- pr_warn("arcmsr%d: request_irq = %d failed!\n",
- acb->host->host_no, pdev->irq);
- return FAILED;
}
+
return SUCCESS;
+out_free_irq:
+ while (--i >= 0)
+ free_irq(pci_irq_vector(pdev, i), acb);
+ pci_free_irq_vectors(pdev);
+ return FAILED;
}

static int arcmsr_probe(struct pci_dev *pdev, const struct pci_device_id *id)
@@ -886,15 +874,9 @@ static void arcmsr_free_irq(struct pci_dev *pdev,
{
int i;

- if (acb->acb_flags & ACB_F_MSI_ENABLED) {
- free_irq(pdev->irq, acb);
- pci_disable_msi(pdev);
- } else if (acb->acb_flags & ACB_F_MSIX_ENABLED) {
- for (i = 0; i < acb->msix_vector_count; i++)
- free_irq(acb->entries[i].vector, acb);
- pci_disable_msix(pdev);
- } else
- free_irq(pdev->irq, acb);
+ for (i = 0; i < acb->vector_count; i++)
+ free_irq(pci_irq_vector(pdev, i), acb);
+ pci_free_irq_vectors(pdev);
}

static int arcmsr_suspend(struct pci_dev *pdev, pm_message_t state)
--
2.1.4
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