linux-kernel - [PATCH] powerpc/pseries: Add pcibios_default

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Date:   Fri, 21 Aug 2020 15:51:15 -0500
From:   Shawn Anastasio <shawn@...stas.io>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, mpe@...erman.id.au, oohall@...il.com,
        aik@...abs.ru
Subject: [PATCH] powerpc/pseries: Add pcibios_default_alignment implementation

Implement pcibios_default_alignment for pseries so that
resources are page-aligned. The main benefit of this is being
able to map any resource from userspace via mechanisms like VFIO.

This is identical to powernv's implementation.

Signed-off-by: Shawn Anastasio <shawn@...stas.io>
---
 arch/powerpc/platforms/pseries/pci.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
index 911534b89c85..6d922c096354 100644
--- a/arch/powerpc/platforms/pseries/pci.c
+++ b/arch/powerpc/platforms/pseries/pci.c
@@ -210,6 +210,11 @@ int pseries_pcibios_sriov_disable(struct pci_dev *pdev)
 }
 #endif
 
+static resource_size_t pseries_pcibios_default_alignment(void)
+{
+	return PAGE_SIZE;
+}
+
 static void __init pSeries_request_regions(void)
 {
 	if (!isa_io_base)
@@ -231,6 +236,8 @@ void __init pSeries_final_fixup(void)
 
 	eeh_show_enabled();
 
+	ppc_md.pcibios_default_alignment = pseries_pcibios_default_alignment;
+
 #ifdef CONFIG_PCI_IOV
 	ppc_md.pcibios_sriov_enable = pseries_pcibios_sriov_enable;
 	ppc_md.pcibios_sriov_disable = pseries_pcibios_sriov_disable;
-- 
2.28.0