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Date: Tue, 06 May 2014 16:04:42 +0800
From: ching <ching2048@...ca.com.tw>
To: Tomas Henzl <thenzl@...hat.com>
Cc: jbottomley@...allels.com, dan.carpenter@...cle.com,
linux-scsi@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1.1 2/16 update] arcmsr: Adding code to support MSI-X
interrupt
Thanks for Tomas' suggestion.
I will have a new update for this patch.
On Mon, 2014-05-05 at 14:53 +0200, Tomas Henzl wrote:
> On 05/05/2014 01:15 PM, ching wrote:
> > From: Ching<ching2048@...ca.com.tw>
> >
> > Adding code for supporting MSI-X interrupt.
> >
> > This update is for fixing bug of previous [PATCH v1.1 2/16].
> >
> > Signed-off-by: Ching<ching2048@...ca.com.tw>
> > ---
> >
> > diff -uprN a/drivers/scsi/arcmsr/arcmsr.h b/drivers/scsi/arcmsr/arcmsr.h
> > --- a/drivers/scsi/arcmsr/arcmsr.h 2014-04-28 16:02:46.000000000 +0800
> > +++ b/drivers/scsi/arcmsr/arcmsr.h 2014-04-28 16:25:06.000000000 +0800
> > @@ -64,6 +64,7 @@ struct device_attribute;
> > #define ARCMSR_MAX_HBB_POSTQUEUE 264
> > #define ARCMSR_MAX_XFER_LEN 0x26000 /* 152K */
> > #define ARCMSR_CDB_SG_PAGE_LENGTH 256
> > +#define ARCMST_NUM_MSIX_VECTORS 4
> > #ifndef PCI_DEVICE_ID_ARECA_1880
> > #define PCI_DEVICE_ID_ARECA_1880 0x1880
> > #endif
> > @@ -508,6 +509,7 @@ 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;
> > @@ -544,6 +546,8 @@ 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;
> > diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
> > --- a/drivers/scsi/arcmsr/arcmsr_hba.c 2014-04-28 15:58:34.000000000 +0800
> > +++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2014-05-05 18:57:03.000000000 +0800
> > @@ -603,6 +603,79 @@ static void arcmsr_message_isr_bh_fn(str
> > }
> > }
> >
> > +static int
> > +arcmsr_request_irq(struct pci_dev *pdev, struct AdapterControlBlock *acb)
> > +{
> > + int i, j, r;
> > + struct msix_entry entries[ARCMST_NUM_MSIX_VECTORS];
> > +
> > + if (!pci_find_capability(pdev, PCI_CAP_ID_MSIX))
> > + goto msi_int;
> > + for (i = 0; i < ARCMST_NUM_MSIX_VECTORS; i++)
> > + entries[i].entry = i;
> > + r = pci_enable_msix(pdev, entries, ARCMST_NUM_MSIX_VECTORS);
> > + if (r < 0)
> > + goto msi_int;
> > + if (r == 0) {
> > + for (i = 0; i < ARCMST_NUM_MSIX_VECTORS; i++) {
> > + if (request_irq(entries[i].vector,
> > + arcmsr_do_interrupt, 0, "arcmsr", acb)) {
> > + pr_warn("arcmsr%d: request_irq =%d failed!\n",
> > + acb->host->host_no, pdev->irq);
> > + for (j = 0 ; j < i ; j++)
> > + free_irq(entries[j].vector, acb);
> > + pci_disable_msix(pdev);
> > + goto msi_int;
> > + }
> > + 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 ARC_SUCCESS;
> > + } else {
> > + if (pci_enable_msix(pdev, entries, r))
> > + goto msi_int;
> > + for (i = 0; i < r; i++) {
> > + if (request_irq(entries[i].vector,
> > + arcmsr_do_interrupt, 0, "arcmsr", acb)) {
> > + pr_warn("arcmsr%d: request_irq =%d failed!\n",
> > + acb->host->host_no, pdev->irq);
> > + for (j = 0 ; j < i ; j++)
> > + free_irq(entries[j].vector, acb);
> > + pci_disable_msix(pdev);
> > + goto msi_int;
> > + }
> > + 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 ARC_SUCCESS;
> > + }
>
> Hi Ching, Dan,
> the above construction might be simplified even a bit more -
> if (r)
> if (pci_enable_msix(pdev, entries, r))
> goto msi_int;
> else
> r = ARCMST_NUM_MSIX_VECTORS;
>
> for (i = 0; i < r; i++) {
> if (request_irq(entries[i].vector,
> arcmsr_do_interrupt, 0, "arcmsr", acb)) {
> pr_warn("arcmsr%d: request_irq =%d failed!\n",
> acb->host->host_no, pdev->irq);
> for (j = 0 ; j < i ; j++)
> free_irq(entries[j].vector, acb);
> pci_disable_msix(pdev);
> goto msi_int;
> }
> 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 ARC_SUCCESS;
> Otherwise as Dan said the function looks now good
> thanks, tomas
>
> > +msi_int:
> > + if (!pci_find_capability(pdev, PCI_CAP_ID_MSI))
> > + goto legacy_int;
> > + if (pci_enable_msi(pdev))
> > + 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 ARC_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 ARC_FAILURE;
> > + }
> > + return ARC_SUCCESS;
> > +}
> > +
> > static int arcmsr_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > {
> > struct Scsi_Host *host;
> > @@ -667,16 +740,13 @@ static int arcmsr_probe(struct pci_dev *
> > if(error){
> > goto free_hbb_mu;
> > }
> > - arcmsr_iop_init(acb);
> > error = scsi_add_host(host, &pdev->dev);
> > if(error){
> > goto RAID_controller_stop;
> > }
> > - error = request_irq(pdev->irq, arcmsr_do_interrupt, IRQF_SHARED, "arcmsr", acb);
> > - if(error){
> > + if (arcmsr_request_irq(pdev, acb) == ARC_FAILURE)
> > goto scsi_host_remove;
> > - }
> > - host->irq = pdev->irq;
> > + arcmsr_iop_init(acb);
> > scsi_scan_host(host);
> > INIT_WORK(&acb->arcmsr_do_message_isr_bh, arcmsr_message_isr_bh_fn);
> > atomic_set(&acb->rq_map_token, 16);
> > @@ -992,6 +1062,22 @@ static void arcmsr_done4abort_postqueue(
> > }
> > }
> > }
> > +
> > +static void arcmsr_free_irq(struct pci_dev *pdev, struct AdapterControlBlock *acb)
> > +{
> > + 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 < ARCMST_NUM_MSIX_VECTORS; i++)
> > + free_irq(acb->entries[i].vector, acb);
> > + pci_disable_msix(pdev);
> > + } else
> > + free_irq(pdev->irq, acb);
> > +}
> > +
> > static void arcmsr_remove(struct pci_dev *pdev)
> > {
> > struct Scsi_Host *host = pci_get_drvdata(pdev);
> > @@ -1029,7 +1115,7 @@ static void arcmsr_remove(struct pci_dev
> > }
> > }
> > }
> > - free_irq(pdev->irq, acb);
> > + arcmsr_free_irq(pdev, acb);
> > arcmsr_free_ccb_pool(acb);
> > arcmsr_free_hbb_mu(acb);
> > arcmsr_unmap_pciregion(acb);
> > @@ -1045,6 +1131,7 @@ static void arcmsr_shutdown(struct pci_d
> > (struct AdapterControlBlock *)host->hostdata;
> > del_timer_sync(&acb->eternal_timer);
> > arcmsr_disable_outbound_ints(acb);
> > + arcmsr_free_irq(pdev, acb);
> > flush_work(&acb->arcmsr_do_message_isr_bh);
> > arcmsr_stop_adapter_bgrb(acb);
> > arcmsr_flush_adapter_cache(acb);
> > @@ -2516,8 +2603,6 @@ static int arcmsr_iop_confirm(struct Ada
> > case ACB_ADAPTER_TYPE_A: {
> > if (cdb_phyaddr_hi32 != 0) {
> > struct MessageUnit_A __iomem *reg = acb->pmuA;
> > - uint32_t intmask_org;
> > - intmask_org = arcmsr_disable_outbound_ints(acb);
> > writel(ARCMSR_SIGNATURE_SET_CONFIG, \
> > ®->message_rwbuffer[0]);
> > writel(cdb_phyaddr_hi32, ®->message_rwbuffer[1]);
> > @@ -2529,7 +2614,6 @@ static int arcmsr_iop_confirm(struct Ada
> > acb->host->host_no);
> > return 1;
> > }
> > - arcmsr_enable_outbound_ints(acb, intmask_org);
> > }
> > }
> > break;
> > @@ -2539,8 +2623,6 @@ static int arcmsr_iop_confirm(struct Ada
> > uint32_t __iomem *rwbuffer;
> >
> > struct MessageUnit_B *reg = acb->pmuB;
> > - uint32_t intmask_org;
> > - intmask_org = arcmsr_disable_outbound_ints(acb);
> > reg->postq_index = 0;
> > reg->doneq_index = 0;
> > writel(ARCMSR_MESSAGE_SET_POST_WINDOW, reg->drv2iop_doorbell);
> > @@ -2569,7 +2651,6 @@ static int arcmsr_iop_confirm(struct Ada
> > return 1;
> > }
> > arcmsr_hbb_enable_driver_mode(acb);
> > - arcmsr_enable_outbound_ints(acb, intmask_org);
> > }
> > break;
> > case ACB_ADAPTER_TYPE_C: {
> >
> >
> > --
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>
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