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* [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
@ 2024-01-05  5:38 Ma, Hua
  2024-01-09 23:48 ` Benjamin Doron
  2024-01-10  1:27 ` Nate DeSimone
  0 siblings, 2 replies; 7+ messages in thread
From: Ma, Hua @ 2024-01-05  5:38 UTC (permalink / raw)
  To: devel; +Cc: Hua Ma

Add macro to enable selection of timer

- HPET:  UEFI Payload will use HPET timer
- LAPIC: UEFI Payload will use local APIC timer

Signed-off-by: Hua Ma <hua.ma@intel.com>
---
 UefiPayloadPkg/UefiPayloadPkg.dsc | 16 ++++++++++++++++
 UefiPayloadPkg/UefiPayloadPkg.fdf |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc b/UefiPayloadPkg/UefiPayloadPkg.dsc
index b8b13ad201..4f195c1e52 100644
--- a/UefiPayloadPkg/UefiPayloadPkg.dsc
+++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
@@ -139,6 +139,12 @@
   # Note: for emulation platform such as QEMU, this may not work and should set it as FALSE
   DEFINE CPU_TIMER_LIB_ENABLE  = TRUE
 
+  #
+  # HPET:  UEFI Payload will use HPET timer
+  # LAPIC: UEFI Payload will use local APIC timer
+  #
+  DEFINE TIMER_SUPPORT      = HPET
+
   DEFINE MULTIPLE_DEBUG_PORT_SUPPORT = FALSE
 
 [BuildOptions]
@@ -676,7 +682,17 @@
   MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
 
 
+!if $(TIMER_SUPPORT) == "HPET"
   PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
+!elseif $(TIMER_SUPPORT) == "LAPIC"
+  OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf {
+    <LibraryClasses>
+      NestedInterruptTplLib|OvmfPkg/Library/NestedInterruptTplLib/NestedInterruptTplLib.inf
+  }
+!else
+  !error "Invalid TIMER_SUPPORT"
+!endif
+
   MdeModulePkg/Universal/Metronome/Metronome.inf
   MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
   MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
diff --git a/UefiPayloadPkg/UefiPayloadPkg.fdf b/UefiPayloadPkg/UefiPayloadPkg.fdf
index 835798be1c..7d04a8cffd 100644
--- a/UefiPayloadPkg/UefiPayloadPkg.fdf
+++ b/UefiPayloadPkg/UefiPayloadPkg.fdf
@@ -161,7 +161,11 @@ INF MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf
 !endif
 INF UefiCpuPkg/CpuDxe/CpuDxe.inf
 
+!if $(TIMER_SUPPORT) == "HPET"
 INF PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
+!elseif $(TIMER_SUPPORT) == "LAPIC"
+INF OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf
+!endif
 INF MdeModulePkg/Universal/Metronome/Metronome.inf
 INF MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
 INF MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
-- 
2.39.1.windows.1



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* Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
       [not found] <17A75CEA85AC7172.16812@groups.io>
@ 2024-01-05  6:19 ` Ma, Hua
  2024-01-05  8:20   ` Guo, Gua
  0 siblings, 1 reply; 7+ messages in thread
From: Ma, Hua @ 2024-01-05  6:19 UTC (permalink / raw)
  To: devel, Gua Guo, Guo Dong, James Lu, Sean Rhodes

Add maintainers to help review the patch,

thank you,
Ma Hua

On 1/5/2024 1:38 PM, Ma, Hua wrote:
> Add macro to enable selection of timer
> 
> - HPET:  UEFI Payload will use HPET timer
> - LAPIC: UEFI Payload will use local APIC timer
> 
> Signed-off-by: Hua Ma <hua.ma@intel.com>
> ---
>   UefiPayloadPkg/UefiPayloadPkg.dsc | 16 ++++++++++++++++
>   UefiPayloadPkg/UefiPayloadPkg.fdf |  4 ++++
>   2 files changed, 20 insertions(+)
> 
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc b/UefiPayloadPkg/UefiPayloadPkg.dsc
> index b8b13ad201..4f195c1e52 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.dsc
> +++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
> @@ -139,6 +139,12 @@
>     # Note: for emulation platform such as QEMU, this may not work and should set it as FALSE
>     DEFINE CPU_TIMER_LIB_ENABLE  = TRUE
>   
> +  #
> +  # HPET:  UEFI Payload will use HPET timer
> +  # LAPIC: UEFI Payload will use local APIC timer
> +  #
> +  DEFINE TIMER_SUPPORT      = HPET
> +
>     DEFINE MULTIPLE_DEBUG_PORT_SUPPORT = FALSE
>   
>   [BuildOptions]
> @@ -676,7 +682,17 @@
>     MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
>   
>   
> +!if $(TIMER_SUPPORT) == "HPET"
>     PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
> +!elseif $(TIMER_SUPPORT) == "LAPIC"
> +  OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf {
> +    <LibraryClasses>
> +      NestedInterruptTplLib|OvmfPkg/Library/NestedInterruptTplLib/NestedInterruptTplLib.inf
> +  }
> +!else
> +  !error "Invalid TIMER_SUPPORT"
> +!endif
> +
>     MdeModulePkg/Universal/Metronome/Metronome.inf
>     MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
>     MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.fdf b/UefiPayloadPkg/UefiPayloadPkg.fdf
> index 835798be1c..7d04a8cffd 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.fdf
> +++ b/UefiPayloadPkg/UefiPayloadPkg.fdf
> @@ -161,7 +161,11 @@ INF MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf
>   !endif
>   INF UefiCpuPkg/CpuDxe/CpuDxe.inf
>   
> +!if $(TIMER_SUPPORT) == "HPET"
>   INF PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
> +!elseif $(TIMER_SUPPORT) == "LAPIC"
> +INF OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf
> +!endif
>   INF MdeModulePkg/Universal/Metronome/Metronome.inf
>   INF MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
>   INF MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf


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^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
  2024-01-05  6:19 ` Ma, Hua
@ 2024-01-05  8:20   ` Guo, Gua
  0 siblings, 0 replies; 7+ messages in thread
From: Guo, Gua @ 2024-01-05  8:20 UTC (permalink / raw)
  To: Ma, Hua, devel@edk2.groups.io, Dong, Guo, Lu, James, Rhodes, Sean

Reviewed-by: Gua Guo <gua.guo@intel.com>

-----Original Message-----
From: Ma, Hua <hua.ma@intel.com> 
Sent: Friday, January 5, 2024 2:19 PM
To: devel@edk2.groups.io; Guo, Gua <gua.guo@intel.com>; Dong, Guo <guo.dong@intel.com>; Lu, James <james.lu@intel.com>; Rhodes, Sean <sean@starlabs.systems>
Subject: Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer

Add maintainers to help review the patch,

thank you,
Ma Hua

On 1/5/2024 1:38 PM, Ma, Hua wrote:
> Add macro to enable selection of timer
> 
> - HPET:  UEFI Payload will use HPET timer
> - LAPIC: UEFI Payload will use local APIC timer
> 
> Signed-off-by: Hua Ma <hua.ma@intel.com>
> ---
>   UefiPayloadPkg/UefiPayloadPkg.dsc | 16 ++++++++++++++++
>   UefiPayloadPkg/UefiPayloadPkg.fdf |  4 ++++
>   2 files changed, 20 insertions(+)
> 
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc 
> b/UefiPayloadPkg/UefiPayloadPkg.dsc
> index b8b13ad201..4f195c1e52 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.dsc
> +++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
> @@ -139,6 +139,12 @@
>     # Note: for emulation platform such as QEMU, this may not work and should set it as FALSE
>     DEFINE CPU_TIMER_LIB_ENABLE  = TRUE
>   
> +  #
> +  # HPET:  UEFI Payload will use HPET timer  # LAPIC: UEFI Payload 
> + will use local APIC timer  #
> +  DEFINE TIMER_SUPPORT      = HPET
> +
>     DEFINE MULTIPLE_DEBUG_PORT_SUPPORT = FALSE
>   
>   [BuildOptions]
> @@ -676,7 +682,17 @@
>     MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuApp.inf
>   
>   
> +!if $(TIMER_SUPPORT) == "HPET"
>     PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
> +!elseif $(TIMER_SUPPORT) == "LAPIC"
> +  OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf {
> +    <LibraryClasses>
> +      
> +NestedInterruptTplLib|OvmfPkg/Library/NestedInterruptTplLib/NestedInt
> +erruptTplLib.inf
> +  }
> +!else
> +  !error "Invalid TIMER_SUPPORT"
> +!endif
> +
>     MdeModulePkg/Universal/Metronome/Metronome.inf
>     MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
>     MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.fdf 
> b/UefiPayloadPkg/UefiPayloadPkg.fdf
> index 835798be1c..7d04a8cffd 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.fdf
> +++ b/UefiPayloadPkg/UefiPayloadPkg.fdf
> @@ -161,7 +161,11 @@ INF MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf
>   !endif
>   INF UefiCpuPkg/CpuDxe/CpuDxe.inf
>   
> +!if $(TIMER_SUPPORT) == "HPET"
>   INF PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
> +!elseif $(TIMER_SUPPORT) == "LAPIC"
> +INF OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf
> +!endif
>   INF MdeModulePkg/Universal/Metronome/Metronome.inf
>   INF MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
>   INF MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf


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^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
  2024-01-05  5:38 [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer Ma, Hua
@ 2024-01-09 23:48 ` Benjamin Doron
  2024-01-10  1:28   ` Nate DeSimone
  2024-01-10  1:27 ` Nate DeSimone
  1 sibling, 1 reply; 7+ messages in thread
From: Benjamin Doron @ 2024-01-09 23:48 UTC (permalink / raw)
  To: Ma, Hua, devel

[-- Attachment #1: Type: text/plain, Size: 497 bytes --]

Hi,
Are there platforms that will use this? What advantages does using the LAPIC as a timer offer? Thanks.

Regards,
Benjamin


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^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
  2024-01-05  5:38 [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer Ma, Hua
  2024-01-09 23:48 ` Benjamin Doron
@ 2024-01-10  1:27 ` Nate DeSimone
  1 sibling, 0 replies; 7+ messages in thread
From: Nate DeSimone @ 2024-01-10  1:27 UTC (permalink / raw)
  To: devel@edk2.groups.io, Ma, Hua

Hi Hua,

Please make TIMER_SUPPORT a FixedAtBuiildPcd instead of a build flag. Something like PcdDxeTimerSelection or similar.

Thanks,
Nate

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ma, Hua
> Sent: Thursday, January 4, 2024 9:39 PM
> To: devel@edk2.groups.io
> Cc: Ma, Hua <hua.ma@intel.com>
> Subject: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection
> of timer
> 
> Add macro to enable selection of timer
> 
> - HPET:  UEFI Payload will use HPET timer
> - LAPIC: UEFI Payload will use local APIC timer
> 
> Signed-off-by: Hua Ma <hua.ma@intel.com>
> ---
>  UefiPayloadPkg/UefiPayloadPkg.dsc | 16 ++++++++++++++++
> UefiPayloadPkg/UefiPayloadPkg.fdf |  4 ++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.dsc
> b/UefiPayloadPkg/UefiPayloadPkg.dsc
> index b8b13ad201..4f195c1e52 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.dsc
> +++ b/UefiPayloadPkg/UefiPayloadPkg.dsc
> @@ -139,6 +139,12 @@
>    # Note: for emulation platform such as QEMU, this may not work and should
> set it as FALSE
>    DEFINE CPU_TIMER_LIB_ENABLE  = TRUE
> 
> +  #
> +  # HPET:  UEFI Payload will use HPET timer  # LAPIC: UEFI Payload will
> + use local APIC timer  #
> +  DEFINE TIMER_SUPPORT      = HPET
> +
>    DEFINE MULTIPLE_DEBUG_PORT_SUPPORT = FALSE
> 
>  [BuildOptions]
> @@ -676,7 +682,17 @@
> 
> MdeModulePkg/Application/BootManagerMenuApp/BootManagerMenuAp
> p.inf
> 
> 
> +!if $(TIMER_SUPPORT) == "HPET"
>    PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
> +!elseif $(TIMER_SUPPORT) == "LAPIC"
> +  OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf {
> +    <LibraryClasses>
> +
> +NestedInterruptTplLib|OvmfPkg/Library/NestedInterruptTplLib/NestedInter
> +ruptTplLib.inf
> +  }
> +!else
> +  !error "Invalid TIMER_SUPPORT"
> +!endif
> +
>    MdeModulePkg/Universal/Metronome/Metronome.inf
>    MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
>    MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
> diff --git a/UefiPayloadPkg/UefiPayloadPkg.fdf
> b/UefiPayloadPkg/UefiPayloadPkg.fdf
> index 835798be1c..7d04a8cffd 100644
> --- a/UefiPayloadPkg/UefiPayloadPkg.fdf
> +++ b/UefiPayloadPkg/UefiPayloadPkg.fdf
> @@ -161,7 +161,11 @@ INF
> MdeModulePkg/Universal/SecurityStubDxe/SecurityStubDxe.inf
>  !endif
>  INF UefiCpuPkg/CpuDxe/CpuDxe.inf
> 
> +!if $(TIMER_SUPPORT) == "HPET"
>  INF PcAtChipsetPkg/HpetTimerDxe/HpetTimerDxe.inf
> +!elseif $(TIMER_SUPPORT) == "LAPIC"
> +INF OvmfPkg/LocalApicTimerDxe/LocalApicTimerDxe.inf
> +!endif
>  INF MdeModulePkg/Universal/Metronome/Metronome.inf
>  INF MdeModulePkg/Universal/WatchdogTimerDxe/WatchdogTimer.inf
>  INF MdeModulePkg/Core/RuntimeDxe/RuntimeDxe.inf
> --
> 2.39.1.windows.1
> 
> 
> 
> 
> 



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^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
  2024-01-09 23:48 ` Benjamin Doron
@ 2024-01-10  1:28   ` Nate DeSimone
  2024-01-10  2:09     ` Benjamin Doron
  0 siblings, 1 reply; 7+ messages in thread
From: Nate DeSimone @ 2024-01-10  1:28 UTC (permalink / raw)
  To: devel@edk2.groups.io, benjamin.doron00@gmail.com, Ma, Hua

[-- Attachment #1: Type: text/plain, Size: 1226 bytes --]

Hi Benjamin,

We consider using the LAPIC as a timer to be technically superior because it is closer to the CPU. The HPET is a PCH device, which means all access to the timer needs go from CPU -> Home Agent -> Fabric/IO Ring -> DMI Controller -> PCH. Using the LAPIC cuts this path to just the Home Agent. That reduces access latency, which for a timer means higher resolution.

Hope that helps,
Nate

From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Benjamin Doron <benjamin.doron00@gmail.com>
Date: Tuesday, January 9, 2024 at 3:48 PM
To: Ma <>, Ma, Hua <Hua.Ma@intel.com>, devel@edk2.groups.io <devel@edk2.groups.io>
Subject: Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
Hi,
Are there platforms that will use this? What advantages does using the LAPIC as a timer offer? Thanks.

Regards,
Benjamin



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^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
  2024-01-10  1:28   ` Nate DeSimone
@ 2024-01-10  2:09     ` Benjamin Doron
  0 siblings, 0 replies; 7+ messages in thread
From: Benjamin Doron @ 2024-01-10  2:09 UTC (permalink / raw)
  To: Desimone, Nathaniel L, devel@edk2.groups.io, Ma, Hua

[-- Attachment #1: Type: text/plain, Size: 1424 bytes --]

Hi Nate,
Ah, that makes sense. Thanks!

Best regards,
Benjamin

On January 9, 2024 8:28:08 p.m. EST, "Desimone, Nathaniel L" <nathaniel.l.desimone@intel.com> wrote:
>Hi Benjamin,
>
>We consider using the LAPIC as a timer to be technically superior because it is closer to the CPU. The HPET is a PCH device, which means all access to the timer needs go from CPU -> Home Agent -> Fabric/IO Ring -> DMI Controller -> PCH. Using the LAPIC cuts this path to just the Home Agent. That reduces access latency, which for a timer means higher resolution.
>
>Hope that helps,
>Nate
>
>From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Benjamin Doron <benjamin.doron00@gmail.com>
>Date: Tuesday, January 9, 2024 at 3:48 PM
>To: Ma <>, Ma, Hua <Hua.Ma@intel.com>, devel@edk2.groups.io <devel@edk2.groups.io>
>Subject: Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
>Hi,
>Are there platforms that will use this? What advantages does using the LAPIC as a timer offer? Thanks.
>
>Regards,
>Benjamin
>


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^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2024-01-10  2:09 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-01-05  5:38 [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer Ma, Hua
2024-01-09 23:48 ` Benjamin Doron
2024-01-10  1:28   ` Nate DeSimone
2024-01-10  2:09     ` Benjamin Doron
2024-01-10  1:27 ` Nate DeSimone
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2024-01-05  6:19 ` Ma, Hua
2024-01-05  8:20   ` Guo, Gua

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