linux-kernel - [PATCH v2 02/13] powerpc/powernv: Set correct configuration space size for opencapi devices

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Message-Id: <20180123113148.6024-3-fbarrat@linux.vnet.ibm.com>
Date:   Tue, 23 Jan 2018 12:31:37 +0100
From:   Frederic Barrat <fbarrat@...ux.vnet.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org, mpe@...erman.id.au,
        andrew.donnellan@....ibm.com, alastair@....ibm.com
Subject: [PATCH v2 02/13] powerpc/powernv: Set correct configuration space size for opencapi devices

From: Andrew Donnellan <andrew.donnellan@....ibm.com>

The configuration space for opencapi devices doesn't have a PCI
Express capability, therefore confusing linux in thinking it's of an
old PCI type with a 256-byte configuration space size, instead of the
desired 4k. So add a PCI fixup to declare the correct size.

Signed-off-by: Andrew Donnellan <andrew.donnellan@....ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@...ux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index e780263a14ee..d5af700820f3 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -4080,6 +4080,19 @@ void __init pnv_pci_init_npu2_opencapi_phb(struct device_node *np)
 	pnv_pci_init_ioda_phb(np, 0, PNV_PHB_NPU_OCAPI);
 }
 
+static void pnv_npu2_opencapi_cfg_size_fixup(struct pci_dev *dev)
+{
+	struct pci_controller *hose = pci_bus_to_host(dev->bus);
+	struct pnv_phb *phb = hose->private_data;
+
+	if (!machine_is(powernv))
+		return;
+
+	if (phb->type == PNV_PHB_NPU_OCAPI)
+		dev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pnv_npu2_opencapi_cfg_size_fixup);
+
 void __init pnv_pci_init_ioda_hub(struct device_node *np)
 {
 	struct device_node *phbn;
-- 
2.14.1