diff options
author | Dong Nguyen <Dong.Nguyen@amd.com> | 2010-07-21 16:56:08 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:40 -0700 |
commit | 43b86af83da7db8b2c6d85ca970203950e5bad88 (patch) | |
tree | dce6f46e7902bb295d2520c5ef9d3191e1e31489 /drivers/usb/host | |
parent | 13dd0c9767349b280cf131c34461f85e5effc42a (diff) | |
download | linux-43b86af83da7db8b2c6d85ca970203950e5bad88.tar.bz2 |
USB: xHCI: Supporting MSI/MSI-X
Enable MSI/MSI-X supporting in xhci driver.
Provide the mechanism to fall back using MSI and Legacy IRQs
if MSI-X IRQs register failed.
Signed-off-by: Dong Nguyen <Dong.Nguyen@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>,
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r-- | drivers/usb/host/xhci.c | 166 | ||||
-rw-r--r-- | drivers/usb/host/xhci.h | 2 |
2 files changed, 127 insertions, 41 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 5e73386b3899..3106d22ae053 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -20,6 +20,7 @@ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <linux/pci.h> #include <linux/irq.h> #include <linux/log2.h> #include <linux/module.h> @@ -171,22 +172,95 @@ int xhci_reset(struct xhci_hcd *xhci) return handshake(xhci, &xhci->op_regs->status, STS_CNR, 0, 250 * 1000); } +static irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd) +{ + irqreturn_t ret; -#if 0 -/* Set up MSI-X table for entry 0 (may claim other entries later) */ -static int xhci_setup_msix(struct xhci_hcd *xhci) + set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags); + + ret = xhci_irq(hcd); + + return ret; +} + +/* + * Free IRQs + * free all IRQs request + */ +static void xhci_free_irq(struct xhci_hcd *xhci) +{ + int i; + struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); + + /* return if using legacy interrupt */ + if (xhci_to_hcd(xhci)->irq >= 0) + return; + + if (xhci->msix_entries) { + for (i = 0; i < xhci->msix_count; i++) + if (xhci->msix_entries[i].vector) + free_irq(xhci->msix_entries[i].vector, + xhci_to_hcd(xhci)); + } else if (pdev->irq >= 0) + free_irq(pdev->irq, xhci_to_hcd(xhci)); + + return; +} + +/* + * Set up MSI + */ +static int xhci_setup_msi(struct xhci_hcd *xhci) { int ret; + struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); + + ret = pci_enable_msi(pdev); + if (ret) { + xhci_err(xhci, "failed to allocate MSI entry\n"); + return ret; + } + + ret = request_irq(pdev->irq, (irq_handler_t)xhci_msi_irq, + 0, "xhci_hcd", xhci_to_hcd(xhci)); + if (ret) { + xhci_err(xhci, "disable MSI interrupt\n"); + pci_disable_msi(pdev); + } + + return ret; +} + +/* + * Set up MSI-X + */ +static int xhci_setup_msix(struct xhci_hcd *xhci) +{ + int i, ret = 0; struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); - xhci->msix_count = 0; - /* XXX: did I do this right? ixgbe does kcalloc for more than one */ - xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL); + /* + * calculate number of msi-x vectors supported. + * - HCS_MAX_INTRS: the max number of interrupts the host can handle, + * with max number of interrupters based on the xhci HCSPARAMS1. + * - num_online_cpus: maximum msi-x vectors per CPUs core. + * Add additional 1 vector to ensure always available interrupt. + */ + xhci->msix_count = min(num_online_cpus() + 1, + HCS_MAX_INTRS(xhci->hcs_params1)); + + xhci->msix_entries = + kmalloc((sizeof(struct msix_entry))*xhci->msix_count, + GFP_KERNEL); if (!xhci->msix_entries) { xhci_err(xhci, "Failed to allocate MSI-X entries\n"); return -ENOMEM; } - xhci->msix_entries[0].entry = 0; + + for (i = 0; i < xhci->msix_count; i++) { + xhci->msix_entries[i].entry = i; + xhci->msix_entries[i].vector = 0; + } ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count); if (ret) { @@ -194,20 +268,19 @@ static int xhci_setup_msix(struct xhci_hcd *xhci) goto free_entries; } - /* - * Pass the xhci pointer value as the request_irq "cookie". - * If more irqs are added, this will need to be unique for each one. - */ - ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0, - "xHCI", xhci_to_hcd(xhci)); - if (ret) { - xhci_err(xhci, "Failed to allocate MSI-X interrupt\n"); - goto disable_msix; + for (i = 0; i < xhci->msix_count; i++) { + ret = request_irq(xhci->msix_entries[i].vector, + (irq_handler_t)xhci_msi_irq, + 0, "xhci_hcd", xhci_to_hcd(xhci)); + if (ret) + goto disable_msix; } - xhci_dbg(xhci, "Finished setting up MSI-X\n"); - return 0; + + return ret; disable_msix: + xhci_err(xhci, "disable MSI-X interrupt\n"); + xhci_free_irq(xhci); pci_disable_msix(pdev); free_entries: kfree(xhci->msix_entries); @@ -215,21 +288,23 @@ free_entries: return ret; } -/* XXX: code duplication; can xhci_setup_msix call this? */ /* Free any IRQs and disable MSI-X */ static void xhci_cleanup_msix(struct xhci_hcd *xhci) { struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); - if (!xhci->msix_entries) - return; - free_irq(xhci->msix_entries[0].vector, xhci); - pci_disable_msix(pdev); - kfree(xhci->msix_entries); - xhci->msix_entries = NULL; - xhci_dbg(xhci, "Finished cleaning up MSI-X\n"); + xhci_free_irq(xhci); + + if (xhci->msix_entries) { + pci_disable_msix(pdev); + kfree(xhci->msix_entries); + xhci->msix_entries = NULL; + } else { + pci_disable_msi(pdev); + } + + return; } -#endif /* * Initialize memory for HCD and xHC (one-time init). @@ -423,20 +498,36 @@ int xhci_run(struct usb_hcd *hcd) { u32 temp; u64 temp_64; + u32 ret; struct xhci_hcd *xhci = hcd_to_xhci(hcd); + struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); void (*doorbell)(struct xhci_hcd *) = NULL; hcd->uses_new_polling = 1; xhci_dbg(xhci, "xhci_run\n"); -#if 0 /* FIXME: MSI not setup yet */ - /* Do this at the very last minute */ + /* unregister the legacy interrupt */ + if (hcd->irq) + free_irq(hcd->irq, hcd); + hcd->irq = -1; + ret = xhci_setup_msix(xhci); - if (!ret) - return ret; + if (ret) + /* fall back to msi*/ + ret = xhci_setup_msi(xhci); + + if (ret) { + /* fall back to legacy interrupt*/ + ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED, + hcd->irq_descr, hcd); + if (ret) { + xhci_err(xhci, "request interrupt %d failed\n", + pdev->irq); + return ret; + } + hcd->irq = pdev->irq; + } - return -ENOSYS; -#endif #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING init_timer(&xhci->event_ring_timer); xhci->event_ring_timer.data = (unsigned long) xhci; @@ -520,11 +611,9 @@ void xhci_stop(struct usb_hcd *hcd) spin_lock_irq(&xhci->lock); xhci_halt(xhci); xhci_reset(xhci); + xhci_cleanup_msix(xhci); spin_unlock_irq(&xhci->lock); -#if 0 /* No MSI yet */ - xhci_cleanup_msix(xhci); -#endif #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING /* Tell the event ring poll function not to reschedule */ xhci->zombie = 1; @@ -558,11 +647,8 @@ void xhci_shutdown(struct usb_hcd *hcd) spin_lock_irq(&xhci->lock); xhci_halt(xhci); - spin_unlock_irq(&xhci->lock); - -#if 0 xhci_cleanup_msix(xhci); -#endif + spin_unlock_irq(&xhci->lock); xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n", xhci_readl(xhci, &xhci->op_regs->status)); diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 6c7e3430ec93..5bc03d1c2beb 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1130,7 +1130,7 @@ struct xhci_hcd { int page_size; /* Valid values are 12 to 20, inclusive */ int page_shift; - /* only one MSI vector for now, but might need more later */ + /* msi-x vectors */ int msix_count; struct msix_entry *msix_entries; /* data structures */ |