In the spirit of the new x86 support for stacked domains and MSI, add the minimum backend to support this feature on arm64.
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com> --- arch/arm64/include/asm/msi.h | 26 ++++++++++++++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/msi.c | 80 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+) create mode 100644 arch/arm64/include/asm/msi.h create mode 100644 arch/arm64/kernel/msi.c diff --git a/arch/arm64/include/asm/msi.h b/arch/arm64/include/asm/msi.h new file mode 100644 index 0000000..d07dab7 --- /dev/null +++ b/arch/arm64/include/asm/msi.h @@ -0,0 +1,26 @@ +/* + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __ARM64_MSI_H__ +#define __ARM64_MSI_H__ + +struct arm64_msi_info { + struct pci_dev *pdev; + irq_hw_number_t msi_hwirq; + int nvec; +}; + +void arm64_init_msi_domain(struct irq_domain *parent, irq_flow_handler_t handle); + +#endif /* __ARM64_MSI_H__ */ diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 5bd029b..33283b8 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -31,6 +31,7 @@ arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o arm64-obj-$(CONFIG_KGDB) += kgdb.o arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o arm64-obj-$(CONFIG_PCI) += pci.o +arm64-obj-$(CONFIG_PCI_MSI_IRQ_DOMAIN) += msi.o obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m) diff --git a/arch/arm64/kernel/msi.c b/arch/arm64/kernel/msi.c new file mode 100644 index 0000000..82f6162 --- /dev/null +++ b/arch/arm64/kernel/msi.c @@ -0,0 +1,80 @@ +/* + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/irq.h> +#include <linux/msi.h> + +#include <asm/msi.h> + +static struct irq_domain *msi_default_domain; +static irq_flow_handler_t msi_flow_handler; + +irq_hw_number_t arch_msi_irq_domain_get_hwirq(void *arg) +{ + struct arm64_msi_info *info = arg; + + return info->msi_hwirq; +} + +void arch_msi_irq_domain_set_hwirq(void *arg, irq_hw_number_t msi_hwirq) +{ + struct arm64_msi_info *info = arg; + + info->msi_hwirq = msi_hwirq; +} + +void arch_msi_irq_set_handler(unsigned int virq) +{ + __irq_set_handler(virq, msi_flow_handler, 0, NULL); +} + +static void arm64_mask_msi_irq(struct irq_data *d) +{ + mask_msi_irq(d); + irq_chip_mask_parent(d); +} + +static void arm64_unmask_msi_irq(struct irq_data *d) +{ + unmask_msi_irq(d); + irq_chip_unmask_parent(d); +} + +static struct irq_chip msi_irq_chip = { + .name = "PCI-MSI", + .irq_unmask = arm64_unmask_msi_irq, + .irq_mask = arm64_mask_msi_irq, + .irq_eoi = irq_chip_eoi_parent, + .irq_set_affinity = irq_chip_set_affinity_parent, +}; + +int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) +{ + struct arm64_msi_info info; + + info.pdev = pdev; + info.nvec = nvec; + + return msi_irq_domain_alloc_irqs(msi_default_domain, type, pdev, &info); +} + +void arm64_init_msi_domain(struct irq_domain *parent, irq_flow_handler_t handle) +{ + WARN_ON(msi_default_domain); + WARN_ON(msi_flow_handler); + msi_flow_handler = handle; + msi_default_domain = msi_create_irq_domain(NULL, &msi_irq_chip, parent); + if (!msi_default_domain) + pr_warn("failed to initialize irqdomain for MSI/MSI-x.\n"); +} -- 2.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
