| Message ID | 20240126234237.547278-6-jacob.jun.pan@linux.intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Coalesced Interrupt Delivery with posted MSI | expand |
On 1/27/2024 7:42 AM, Jacob Pan wrote: > When posted MSI is enabled, all device MSIs are multiplexed into a single > notification vector. MSI handlers will be de-multiplexed at run-time by > system software without IDT delivery. > > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> > --- > arch/x86/include/asm/irq_vectors.h | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h > index 3a19904c2db6..08329bef5b1d 100644 > --- a/arch/x86/include/asm/irq_vectors.h > +++ b/arch/x86/include/asm/irq_vectors.h > @@ -99,9 +99,16 @@ > > #define LOCAL_TIMER_VECTOR 0xec > > +/* > + * Posted interrupt notification vector for all device MSIs delivered to > + * the host kernel. > + */ > +#define POSTED_MSI_NOTIFICATION_VECTOR 0xeb > #define NR_VECTORS 256 > > -#ifdef CONFIG_X86_LOCAL_APIC > +#ifdef X86_POSTED_MSI X86_POSTED_MSI --> CONFIG_X86_POSTED_MSI? > +#define FIRST_SYSTEM_VECTOR POSTED_MSI_NOTIFICATION_VECTOR > +#elif defined(CONFIG_X86_LOCAL_APIC) > #define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR > #else > #define FIRST_SYSTEM_VECTOR NR_VECTORS
Hi Robert, On Thu, 4 Apr 2024 21:38:34 +0800, Robert Hoo <robert.hoo.linux@gmail.com> wrote: > On 1/27/2024 7:42 AM, Jacob Pan wrote: > > When posted MSI is enabled, all device MSIs are multiplexed into a > > single notification vector. MSI handlers will be de-multiplexed at > > run-time by system software without IDT delivery. > > > > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> > > --- > > arch/x86/include/asm/irq_vectors.h | 9 ++++++++- > > 1 file changed, 8 insertions(+), 1 deletion(-) > > > > diff --git a/arch/x86/include/asm/irq_vectors.h > > b/arch/x86/include/asm/irq_vectors.h index 3a19904c2db6..08329bef5b1d > > 100644 --- a/arch/x86/include/asm/irq_vectors.h > > +++ b/arch/x86/include/asm/irq_vectors.h > > @@ -99,9 +99,16 @@ > > > > #define LOCAL_TIMER_VECTOR 0xec > > > > +/* > > + * Posted interrupt notification vector for all device MSIs delivered > > to > > + * the host kernel. > > + */ > > +#define POSTED_MSI_NOTIFICATION_VECTOR 0xeb > > #define NR_VECTORS 256 > > > > -#ifdef CONFIG_X86_LOCAL_APIC > > +#ifdef X86_POSTED_MSI > > X86_POSTED_MSI --> CONFIG_X86_POSTED_MSI? Indeed, thanks for catching that! > > +#define FIRST_SYSTEM_VECTOR > > POSTED_MSI_NOTIFICATION_VECTOR +#elif defined(CONFIG_X86_LOCAL_APIC) > > #define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR > > #else > > #define FIRST_SYSTEM_VECTOR NR_VECTORS > Thanks, Jacob
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h index 3a19904c2db6..08329bef5b1d 100644 --- a/arch/x86/include/asm/irq_vectors.h +++ b/arch/x86/include/asm/irq_vectors.h @@ -99,9 +99,16 @@ #define LOCAL_TIMER_VECTOR 0xec +/* + * Posted interrupt notification vector for all device MSIs delivered to + * the host kernel. + */ +#define POSTED_MSI_NOTIFICATION_VECTOR 0xeb #define NR_VECTORS 256 -#ifdef CONFIG_X86_LOCAL_APIC +#ifdef X86_POSTED_MSI +#define FIRST_SYSTEM_VECTOR POSTED_MSI_NOTIFICATION_VECTOR +#elif defined(CONFIG_X86_LOCAL_APIC) #define FIRST_SYSTEM_VECTOR LOCAL_TIMER_VECTOR #else #define FIRST_SYSTEM_VECTOR NR_VECTORS
When posted MSI is enabled, all device MSIs are multiplexed into a single notification vector. MSI handlers will be de-multiplexed at run-time by system software without IDT delivery. Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> --- arch/x86/include/asm/irq_vectors.h | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)