linux-kernel - linux-next: manual merge of the vhost tree with the pci tree

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Date:   Thu, 31 Jan 2019 13:40:33 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: linux-next: manual merge of the vhost tree with the pci tree

Hi all,

Today's linux-next merge of the vhost tree got a conflict in:

  drivers/pci/setup-bus.c

between commit:

  51c48b310183 ("PCI: Probe bridge window attributes once at enumeration-time")

from the pci tree and commit:

  955156f34e7d ("PCI: avoid bridge feature re-probing on hotplug")

from the vhost tree.

I fixed it up (hopefully - see below) and can carry the fix as
necessary. This is now fixed as far as linux-next is concerned, but any
non trivial conflicts should be mentioned to your upstream maintainer
when your tree is submitted for merging.  You may also want to consider
cooperating with the maintainer of the conflicting tree to minimise any
particularly complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc drivers/pci/setup-bus.c
index 1941bb0a6c13,d5c25d465d97..000000000000
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@@ -735,17 -735,50 +735,26 @@@ int pci_claim_bridge_resource(struct pc
     base/limit registers must be read-only and read as 0. */
  static void pci_bridge_check_ranges(struct pci_bus *bus)
  {
 -	u16 io;
 -	u32 pmem;
  	struct pci_dev *bridge = bus->self;
 -	struct resource *b_res;
 -
 -	b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
 +	struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
  
+ 	/*
+ 	 * Don't re-check after this was called once already:
+ 	 * important since bridge might be in use.
+ 	 * Note: this is only reliable because as per spec all PCI to PCI
+ 	 * bridges support memory unconditionally so IORESOURCE_MEM is set.
+ 	 */
+ 	if (b_res[1].flags & IORESOURCE_MEM)
+ 		return;
+ 
  	b_res[1].flags |= IORESOURCE_MEM;
  
 -	pci_read_config_word(bridge, PCI_IO_BASE, &io);
 -	if (!io) {
 -		pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0);
 -		pci_read_config_word(bridge, PCI_IO_BASE, &io);
 -		pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
 -	}
 -	if (io)
 +	if (bridge->io_window)
  		b_res[0].flags |= IORESOURCE_IO;
  
 -	/*  DECchip 21050 pass 2 errata: the bridge may miss an address
 -	    disconnect boundary by one PCI data phase.
 -	    Workaround: do not use prefetching on this device. */
 -	if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
 -		return;
 -
 -	pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 -	if (!pmem) {
 -		pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
 -					       0xffe0fff0);
 -		pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 -		pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
 -	}
 -	if (pmem) {
 +	if (bridge->pref_window) {
  		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
 -		if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
 -		    PCI_PREF_RANGE_TYPE_64) {
 +		if (bridge->pref_64_window) {
  			b_res[2].flags |= IORESOURCE_MEM_64;
  			b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
  		}

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