The following commit has been merged into the x86/irq branch of tip: Commit-ID: be9be07b22c96dc03d0ecc76b5a5f21c2dcb05a1 Gitweb: https://git.kernel.org/tip/be9be07b22c96dc03d0ecc76b5a5f21c2dcb05a1 Author: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> AuthorDate: Tue, 23 Apr 2024 10:41:13 -07:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Tue, 30 Apr 2024 00:54:43 +02:00 iommu/vt-d: Make posted MSI an opt-in command line option Add a command line opt-in option for posted MSI if CONFIG_X86_POSTED_MSI=y. Also introduce a helper function for testing if posted MSI is supported on the platform. Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240423174114.526704-12-jacob.jun.pan@xxxxxxxxxxxxxxx --- Documentation/admin-guide/kernel-parameters.txt | 2 ++ arch/x86/include/asm/irq_remapping.h | 7 +++++++ drivers/iommu/irq_remapping.c | 5 ++++- 3 files changed, 13 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 902ecd9..dfbe9fd 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2251,6 +2251,8 @@ no_x2apic_optout BIOS x2APIC opt-out request will be ignored nopost disable Interrupt Posting + posted_msi + enable MSIs delivered as posted interrupts iomem= Disable strict checking of access to MMIO memory strict regions from userspace. diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h index 7a2ed15..5036f13 100644 --- a/arch/x86/include/asm/irq_remapping.h +++ b/arch/x86/include/asm/irq_remapping.h @@ -50,6 +50,13 @@ static inline struct irq_domain *arch_get_ir_parent_domain(void) return x86_vector_domain; } +extern bool enable_posted_msi; + +static inline bool posted_msi_supported(void) +{ + return enable_posted_msi && irq_remapping_cap(IRQ_POSTING_CAP); +} + #else /* CONFIG_IRQ_REMAP */ static inline bool irq_remapping_cap(enum irq_remap_cap cap) { return 0; } diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c index ee59647..056fec6 100644 --- a/drivers/iommu/irq_remapping.c +++ b/drivers/iommu/irq_remapping.c @@ -24,6 +24,8 @@ int no_x2apic_optout; int disable_irq_post = 0; +bool enable_posted_msi __ro_after_init; + static int disable_irq_remap; static struct irq_remap_ops *remap_ops; @@ -70,7 +72,8 @@ static __init int setup_irqremap(char *str) no_x2apic_optout = 1; else if (!strncmp(str, "nopost", 6)) disable_irq_post = 1; - + else if (IS_ENABLED(CONFIG_X86_POSTED_MSI) && !strncmp(str, "posted_msi", 10)) + enable_posted_msi = true; str += strcspn(str, ","); while (*str == ',') str++;