linux-kernel - [RFC 1/4] s390/pci: track alignment/length strictness for zpci

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Date:   Wed,  9 Dec 2020 15:27:47 -0500
From:   Matthew Rosato <mjrosato@...ux.ibm.com>
To:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com
Cc:     pmorel@...ux.ibm.com, borntraeger@...ibm.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC 1/4] s390/pci: track alignment/length strictness for zpci_dev

Some zpci device types (e.g., ISM) follow different rules for length
and alignment of pci instructions.  Recognize this and keep track of
it in the zpci_dev.

Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@...ux.ibm.com>
---
 arch/s390/include/asm/pci.h     | 3 ++-
 arch/s390/include/asm/pci_clp.h | 4 +++-
 arch/s390/pci/pci_clp.c         | 1 +
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 2126289..f16ffba 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -133,7 +133,8 @@ struct zpci_dev {
 	u8		has_hp_slot	: 1;
 	u8		is_physfn	: 1;
 	u8		util_str_avail	: 1;
-	u8		reserved	: 4;
+	u8		relaxed_align	: 1;
+	u8		reserved	: 3;
 	unsigned int	devfn;		/* DEVFN part of the RID*/
 
 	struct mutex lock;
diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_clp.h
index 1f4b666..9fb7cbf 100644
--- a/arch/s390/include/asm/pci_clp.h
+++ b/arch/s390/include/asm/pci_clp.h
@@ -150,7 +150,9 @@ struct clp_rsp_query_pci_grp {
 	u16			:  4;
 	u16 noi			: 12;	/* number of interrupts */
 	u8 version;
-	u8			:  6;
+	u8			:  4;
+	u8 relaxed_align	:  1;	/* Relax length and alignment rules */
+	u8			:  1;
 	u8 frame		:  1;
 	u8 refresh		:  1;	/* TLB refresh mode */
 	u16 reserved2;
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 153720d..630f8fc 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -103,6 +103,7 @@ static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
 	zdev->max_msi = response->noi;
 	zdev->fmb_update = response->mui;
 	zdev->version = response->version;
+	zdev->relaxed_align = response->relaxed_align;
 
 	switch (response->version) {
 	case 1:
-- 
1.8.3.1