diff options
author | Oleksandr Suvorov <oleksandr.suvorov@toradex.com> | 2020-03-26 12:44:27 +0200 |
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committer | Oleksandr Suvorov <oleksandr.suvorov@toradex.com> | 2020-03-26 12:46:50 +0200 |
commit | 87d308708712ff6075c4dd54b0519b47fdad8816 (patch) | |
tree | 2fb6458b1db7dd21be2648f42412dd2485846c76 /compat/backport-3.14.c |
Backports v5.4.27
Backports generated by toradex backports f6e8852f1ef28e6d3c9bae8400eb6a87a6b0c3e7
against mainline kernel tag v5.4.27
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Diffstat (limited to 'compat/backport-3.14.c')
-rw-r--r-- | compat/backport-3.14.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/compat/backport-3.14.c b/compat/backport-3.14.c new file mode 100644 index 0000000..aeb3004 --- /dev/null +++ b/compat/backport-3.14.c @@ -0,0 +1,90 @@ +/* + * Copyright (c) 2014 Hauke Mehrtens <hauke@hauke-m.de> + * + * Backport functionality introduced in Linux 3.14. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/version.h> +#include <linux/kernel.h> +#include <linux/pci.h> + +#ifdef CONFIG_PCI_MSI +/** + * pci_enable_msi_range - configure device's MSI capability structure + * @dev: device to configure + * @minvec: minimal number of interrupts to configure + * @maxvec: maximum number of interrupts to configure + * + * This function tries to allocate a maximum possible number of interrupts in a + * range between @minvec and @maxvec. It returns a negative errno if an error + * occurs. If it succeeds, it returns the actual number of interrupts allocated + * and updates the @dev's irq member to the lowest new interrupt number; + * the other interrupt numbers allocated to this device are consecutive. + **/ +int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec) +{ + int nvec = maxvec; + int rc; + + if (maxvec < minvec) + return -ERANGE; + + do { + rc = pci_enable_msi_block(dev, nvec); + if (rc < 0) { + return rc; + } else if (rc > 0) { + if (rc < minvec) + return -ENOSPC; + nvec = rc; + } + } while (rc); + + return nvec; +} +EXPORT_SYMBOL(pci_enable_msi_range); +#endif + +#ifdef CONFIG_PCI_MSI +/** + * pci_enable_msix_range - configure device's MSI-X capability structure + * @dev: pointer to the pci_dev data structure of MSI-X device function + * @entries: pointer to an array of MSI-X entries + * @minvec: minimum number of MSI-X irqs requested + * @maxvec: maximum number of MSI-X irqs requested + * + * Setup the MSI-X capability structure of device function with a maximum + * possible number of interrupts in the range between @minvec and @maxvec + * upon its software driver call to request for MSI-X mode enabled on its + * hardware device function. It returns a negative errno if an error occurs. + * If it succeeds, it returns the actual number of interrupts allocated and + * indicates the successful configuration of MSI-X capability structure + * with new allocated MSI-X interrupts. + **/ +int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, + int minvec, int maxvec) +{ + int nvec = maxvec; + int rc; + + if (maxvec < minvec) + return -ERANGE; + + do { + rc = pci_enable_msix(dev, entries, nvec); + if (rc < 0) { + return rc; + } else if (rc > 0) { + if (rc < minvec) + return -ENOSPC; + nvec = rc; + } + } while (rc); + + return nvec; +} +EXPORT_SYMBOL(pci_enable_msix_range); +#endif |