On Wed, Jan 15, 2014 at 01:30:53PM +0100, Hannes Reinecke wrote:
> Commit 254f796b9f22b1944c64caabc356a56caaa2facd updated
> the driver to use 16 MSI-X vectors, despite the fact that
> older controllers would provide only 4.
> This was causing MSI-X registration to drop down to INTx
> mode. But as the controller support performant mode, the
> initialisation will become confused and cause the machine
> to stall during boot.
>
> This patch fixes up the MSI-X registration to re-issue
> the pci_enable_msix() call with the correct number of
> MSI-X vectors. With that the hpsa driver continues to
> works on older controllers like the P200.
>
> Cc: Stephen M. Cameron <scameron@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Ack.
Looks good to me, thanks.
-- steve
> ---
> drivers/scsi/hpsa.c | 31 +++++++++++++++++--------------
> 1 file changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index 868318a..40989ee 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -598,7 +598,7 @@ static void set_performant_mode(struct ctlr_info *h, struct CommandList *c)
> {
> if (likely(h->transMethod & CFGTBL_Trans_Performant)) {
> c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
> - if (likely(h->msix_vector))
> + if (likely(h->msix_vector > 0))
> c->Header.ReplyQueue =
> raw_smp_processor_id() % h->nreply_queues;
> }
> @@ -4169,21 +4169,24 @@ static void hpsa_interrupt_mode(struct ctlr_info *h)
> goto default_int_mode;
> if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
> dev_info(&h->pdev->dev, "MSIX\n");
> + h->msix_vector = MAX_REPLY_QUEUES;
> err = pci_enable_msix(h->pdev, hpsa_msix_entries,
> - MAX_REPLY_QUEUES);
> - if (!err) {
> - for (i = 0; i < MAX_REPLY_QUEUES; i++)
> - h->intr[i] = hpsa_msix_entries[i].vector;
> - h->msix_vector = 1;
> - return;
> - }
> + h->msix_vector);
> if (err > 0) {
> dev_warn(&h->pdev->dev, "only %d MSI-X vectors "
> "available\n", err);
> - goto default_int_mode;
> + h->msix_vector = err;
> + err = pci_enable_msix(h->pdev, hpsa_msix_entries,
> + h->msix_vector);
> + }
> + if (!err) {
> + for (i = 0; i < h->msix_vector; i++)
> + h->intr[i] = hpsa_msix_entries[i].vector;
> + return;
> } else {
> dev_warn(&h->pdev->dev, "MSI-X init failed %d\n",
> err);
> + h->msix_vector = 0;
> goto default_int_mode;
> }
> }
> @@ -4597,15 +4600,15 @@ static int hpsa_request_irq(struct ctlr_info *h,
> for (i = 0; i < MAX_REPLY_QUEUES; i++)
> h->q[i] = (u8) i;
>
> - if (h->intr_mode == PERF_MODE_INT && h->msix_vector) {
> + if (h->intr_mode == PERF_MODE_INT && h->msix_vector > 0) {
> /* If performant mode and MSI-X, use multiple reply queues */
> - for (i = 0; i < MAX_REPLY_QUEUES; i++)
> + for (i = 0; i < h->msix_vector; i++)
> rc = request_irq(h->intr[i], msixhandler,
> 0, h->devname,
> &h->q[i]);
> } else {
> /* Use single reply pool */
> - if (h->msix_vector || h->msi_vector) {
> + if (h->msix_vector > 0 || h->msi_vector) {
> rc = request_irq(h->intr[h->intr_mode],
> msixhandler, 0, h->devname,
> &h->q[h->intr_mode]);
> @@ -4658,7 +4661,7 @@ static void free_irqs(struct ctlr_info *h)
> return;
> }
>
> - for (i = 0; i < MAX_REPLY_QUEUES; i++)
> + for (i = 0; i < h->msix_vector; i++)
> free_irq(h->intr[i], &h->q[i]);
> }
>
> @@ -5178,7 +5181,7 @@ static void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
> if (!(trans_support & PERFORMANT_MODE))
> return;
>
> - h->nreply_queues = h->msix_vector ? MAX_REPLY_QUEUES : 1;
> + h->nreply_queues = h->msix_vector > 0 ? h->msix_vector : 1;
> hpsa_get_max_perf_mode_cmds(h);
> /* Performant mode ring buffer and supporting data structures */
> h->reply_pool_size = h->max_commands * sizeof(u64) * h->nreply_queues;
> --
> 1.7.12.4
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