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[XIF] Interrupts cleared too late #507

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Silabs-ArjanB opened this issue Apr 8, 2022 · 4 comments
Open

[XIF] Interrupts cleared too late #507

Silabs-ArjanB opened this issue Apr 8, 2022 · 4 comments
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Component:RTL For issues in the RTL (e.g. for files in the rtl directory) Type:Bug For bugs in any content (RTL, Documentation, etc.)

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@Silabs-ArjanB
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If an interrupt is cleared via a (non-bufferable) store, then the interrupt on irq_i will go low in the cycle after the store instruction left the WB stage. As the irq_i lines are registered inside the core, a following instruction can still get to see the interrupt that was supposed to be cleared.
@Silabs-ArjanB
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Silabs-ArjanB commented Apr 8, 2022 •
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This issue is similar to #325. A fix can maybe be done by blanking interrupts the cycle after receiving a load/store rvalid. The non-blanked interrupt presence should still lead to stop issuing new instructions in ID (otherwise blanking can be continued for a long series of loads/stores)

@Silabs-ArjanB
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Both CLIC and Basic should be studied and ideally same fix should be applied for both if needed

@Silabs-ArjanB Silabs-ArjanB mentioned this issue Aug 23, 2022
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silabs-oysteink added a commit to silabs-oysteink/cv32e40x that referenced this issue Aug 29, 2022
@silabs-oysteink
Fix for issue openhwgroup#507.
44fa3bd 
Blanking interrupts for one cycle after a load or store has left WB.
Refactored some assertions for CLIC, added a separate file for CLIC asserts.

Signed-off-by: Oystein Knauserud <[email protected]>
Silabs-ArjanB added a commit that referenced this issue Aug 29, 2022
@Silabs-ArjanB
Merge pull request #655 from silabs-oysteink/silabs-oysteink_issue-507
8b59711 
Fix for issue #507
@silabs-oysteink
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This issue should have been fixed with PR #655. The XIF was not taken into account, so this issue needs to be revisited once the XIF is properly implemented. The existing assertions will likely fail when X_EXT is set to 1.

@Silabs-ArjanB
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Renamed with XIF prefix

@Silabs-ArjanB Silabs-ArjanB added Component:RTL For issues in the RTL (e.g. for files in the rtl directory) Type:Bug For bugs in any content (RTL, Documentation, etc.) labels Aug 29, 2022
@Silabs-ArjanB Silabs-ArjanB changed the title Interrupts cleared too late [XIF] Interrupts cleared too late Aug 29, 2022
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Component:RTL For issues in the RTL (e.g. for files in the rtl directory) Type:Bug For bugs in any content (RTL, Documentation, etc.)
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