linux-kernel - [PATCH 5.0 133/238] PCI: pci-bridge-emul: Extend pci_bridge_emul

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Date:   Fri, 22 Mar 2019 12:15:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Luís Mendes <luis.p.mendes@...il.com>,
        Leigh Brown <leigh@...inno.co.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: [PATCH 5.0 133/238] PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags

5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Petazzoni <thomas.petazzoni@...tlin.com>

commit 33776d059630e5045ea9ccf756c74de8f9cc86de upstream.

Depending on the capabilities of the PCI controller/platform, the
PCI-to-PCI bridge emulation behavior might need to be different. For
example, on platforms that use the pci-mvebu code, we currently don't
support prefetchable memory BARs, so the corresponding fields in the
PCI-to-PCI bridge configuration space should be read-only.

To implement this, extend pci_bridge_emul_init() to take a "flags"
argument, with currently one flag supported:

PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR

that will make the prefetchable memory base and limit registers
read-only.

The pci-mvebu and pci-aardvark drivers are updated accordingly.

Fixes: 1f08673eef123 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Reported-by: Luís Mendes <luis.p.mendes@...il.com>
Reported-by: Leigh Brown <leigh@...inno.co.uk>
Tested-by: Leigh Brown <leigh@...inno.co.uk>
Tested-by: Luis Mendes <luis.p.mendes@...il.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: stable@...r.kernel.org
Cc: Luís Mendes <luis.p.mendes@...il.com>
Cc: Leigh Brown <leigh@...inno.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/controller/pci-aardvark.c |    2 +-
 drivers/pci/controller/pci-mvebu.c    |    2 +-
 drivers/pci/pci-bridge-emul.c         |    8 +++++++-
 drivers/pci/pci-bridge-emul.h         |    7 ++++++-
 4 files changed, 15 insertions(+), 4 deletions(-)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -499,7 +499,7 @@ static void advk_sw_pci_bridge_init(stru
 	bridge->data = pcie;
 	bridge->ops = &advk_pci_bridge_emul_ops;
 
-	pci_bridge_emul_init(bridge);
+	pci_bridge_emul_init(bridge, 0);
 
 }
 
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -583,7 +583,7 @@ static void mvebu_pci_bridge_emul_init(s
 	bridge->data = port;
 	bridge->ops = &mvebu_pci_bridge_emul_ops;
 
-	pci_bridge_emul_init(bridge);
+	pci_bridge_emul_init(bridge, PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR);
 }
 
 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys)
--- a/drivers/pci/pci-bridge-emul.c
+++ b/drivers/pci/pci-bridge-emul.c
@@ -267,7 +267,8 @@ const static struct pci_bridge_reg_behav
  * (typically at least vendor, device, revision), the ->ops pointer,
  * and optionally ->data and ->has_pcie.
  */
-int pci_bridge_emul_init(struct pci_bridge_emul *bridge)
+int pci_bridge_emul_init(struct pci_bridge_emul *bridge,
+			 unsigned int flags)
 {
 	bridge->conf.class_revision |= PCI_CLASS_BRIDGE_PCI << 16;
 	bridge->conf.header_type = PCI_HEADER_TYPE_BRIDGE;
@@ -295,6 +296,11 @@ int pci_bridge_emul_init(struct pci_brid
 		}
 	}
 
+	if (flags & PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR) {
+		bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].ro = ~0;
+		bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].rw = 0;
+	}
+
 	return 0;
 }
 
--- a/drivers/pci/pci-bridge-emul.h
+++ b/drivers/pci/pci-bridge-emul.h
@@ -119,7 +119,12 @@ struct pci_bridge_emul {
 	bool has_pcie;
 };
 
-int pci_bridge_emul_init(struct pci_bridge_emul *bridge);
+enum {
+	PCI_BRIDGE_EMUL_NO_PREFETCHABLE_BAR = BIT(0),
+};
+
+int pci_bridge_emul_init(struct pci_bridge_emul *bridge,
+			 unsigned int flags);
 void pci_bridge_emul_cleanup(struct pci_bridge_emul *bridge);
 
 int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where,