linux-kernel - [PATCH 23/36] PCI: Add has_mem64 for host

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Date:	Mon,  6 Jul 2015 16:39:13 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	David Ahern <david.ahern@...cle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 23/36] PCI: Add has_mem64 for host_bridge

On system that does not support mmio64 above 4g, will not set that.
We will use that info next two following patches:
1. Don't treat non-pref mmio64 as pref mmio, so will not put
   it under bridge's pref range when rescan the devices
2. will keep pref mmio64 and pref mmio32 under bridge pref bar.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/probe.c | 9 +++++++++
 include/linux/pci.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 010d8d9..14bdbca 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2051,6 +2051,15 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 		dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
 	}
 
+	resource_list_for_each_entry(window, &bridge->windows) {
+		res = window->res;
+		if (resource_type(res) == IORESOURCE_MEM &&
+		    (res->end - window->offset) > 0xffffffff) {
+			bridge->has_mem64 = 1;
+			break;
+		}
+	}
+
 	down_write(&pci_bus_sem);
 	list_add_tail(&b->node, &pci_root_buses);
 	up_write(&pci_bus_sem);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 33ef25f..0771b37 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -409,6 +409,7 @@ struct pci_host_bridge {
 	void (*release_fn)(struct pci_host_bridge *);
 	void *release_data;
 	unsigned int ignore_reset_delay:1;	/* for entire hierarchy */
+	unsigned int has_mem64:1;
 };
 
 #define	to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
-- 
1.8.4.5

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