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[PULL,v2,14/47] exec/memtxattr: add process identifier to the transaction attributes

Message ID 20240924221751.2688389-15-alistair.francis@wdc.com (mailing list archive)
State New, archived
Headers show
Series [PULL,v2,01/47] target/riscv: Add a property to set vl to ceil(AVL/2) | expand

Commit Message

Alistair Francis Sept. 24, 2024, 10:17 p.m. UTC 
From: Tomasz Jeznach <tjeznach@rivosinc.com>

Extend memory transaction attributes with process identifier to allow
per-request address translation logic to use requester_id / process_id
to identify memory mapping (e.g. enabling IOMMU w/ PASID translations).

Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Jason Chien <jason.chien@sifive.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20240903201633.93182-2-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 include/exec/memattrs.h | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/include/exec/memattrs.h b/include/exec/memattrs.h
index 14cdd8d582..e27c18f3dc 100644
--- a/include/exec/memattrs.h
+++ b/include/exec/memattrs.h
@@ -52,6 +52,11 @@  typedef struct MemTxAttrs {
     unsigned int memory:1;
     /* Requester ID (for MSI for example) */
     unsigned int requester_id:16;
+
+    /*
+     * PID (PCI PASID) support: Limited to 8 bits process identifier.
+     */
+    unsigned int pid:8;
 } MemTxAttrs;
 
 /* Bus masters which don't specify any attributes will get this,