linux-kernel - [PATCH] docs: powerpc: Clarify book3s/32 MMU families

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Date:   Thu,  2 Jul 2020 14:09:21 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, corbet@....net
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-doc@...r.kernel.org
Subject: [PATCH] docs: powerpc: Clarify book3s/32 MMU families

Documentation wrongly tells that book3s/32 CPU have hash MMU.

603 and e300 core only have software loaded TLB.

755, 7450 family and e600 core have both hash MMU and software loaded
TLB. This can be selected by setting a bit in HID2 (755) or
HID0 (others). At the time being this is not supported by the kernel.

Make this explicit in the documentation.

Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 Documentation/powerpc/cpu_families.rst | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/powerpc/cpu_families.rst b/Documentation/powerpc/cpu_families.rst
index 1e063c5440c3..9b84e045e713 100644
--- a/Documentation/powerpc/cpu_families.rst
+++ b/Documentation/powerpc/cpu_families.rst
@@ -9,7 +9,9 @@ and are supported by arch/powerpc.
 Book3S (aka sPAPR)
 ------------------
 
-- Hash MMU
+- Hash MMU (except 603 and e300)
+- Software loaded TLB (603 and e300)
+- Selectable Software loaded TLB in addition to hash MMU (755, 7450, e600)
 - Mix of 32 & 64 bit::
 
    +--------------+                 +----------------+
@@ -24,9 +26,9 @@ Book3S (aka sPAPR)
           |                                 |
           |                                 |
           v                                 v
-   +--------------+                 +----------------+      +-------+
-   |     604      |                 |    750 (G3)    | ---> | 750CX |
-   +--------------+                 +----------------+      +-------+
+   +--------------+    +-----+      +----------------+      +-------+
+   |     604      |    | 755 | <--- |    750 (G3)    | ---> | 750CX |
+   +--------------+    +-----+      +----------------+      +-------+
           |                                 |                   |
           |                                 |                   |
           v                                 v                   v
-- 
2.25.0