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usb: xhci: request MSI/-X according to requested amount

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Variable 'max_interrupters' contains the maximum supported interrupters
or the maximum interrupters the user has requested. Thus, it should be
used instead of HCS_MAX_INTRS().

User set 'max_interrupters' value is validated in xhci_gen_setup(),
otherwise 'max_interrupters' value is 'HCS_MAX_INTRS(xhci->hcs_params1)'.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20241106101459.775897-26-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Niklas Neronin
2024-11-06 12:14:51 +02:00
committed by Greg Kroah-Hartman
parent 083ba4c46a
commit 34fee04e7b
1 changed files with 4 additions and 7 deletions
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11
drivers/usb/host/xhci-pci.c
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@@ -149,14 +149,11 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
hcd->irq = 0;
/*
* 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.
* Calculate number of MSI/MSI-X vectors supported.
* - max_interrupters: the max number of interrupts requested, capped to xhci HCSPARAMS1.
* - num_online_cpus: one vector per CPUs core, with at least one overall.
*/
xhci->nvecs = min(num_online_cpus() + 1,
HCS_MAX_INTRS(xhci->hcs_params1));
xhci->nvecs = min(num_online_cpus() + 1, xhci->max_interrupters);
/* TODO: Check with MSI Soc for sysdev */
xhci->nvecs = pci_alloc_irq_vectors(pdev, 1, xhci->nvecs,