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Commit d68e70c6 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/bjorn-disable-decode' into next 

* pci/bjorn-disable-decode:
  PCI: disable MEM decoding while updating 64-bit MEM BARs
  PCI: leave MEM and IO decoding disabled during 64-bit BAR sizing, too
parents 9349b44a 9aac537e

drivers/pci/probe.c

+3 −3
Original line number Diff line number Diff line
@@ -189,9 +189,6 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, 
	pci_read_config_dword(dev, pos, &sz);

	pci_write_config_dword(dev, pos, l);



	if (!dev->mmio_always_on)

		pci_write_config_word(dev, PCI_COMMAND, orig_cmd);



	/*

	 * All bits set in sz means the device isn't working properly.

	 * If the BAR isn't implemented, all bits must be 0.  If it's a
@@ -276,6 +273,9 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, 
	}



 out:

	if (!dev->mmio_always_on)

		pci_write_config_word(dev, PCI_COMMAND, orig_cmd);



	return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;

 fail:

	res->flags = 0;

drivers/pci/setup-res.c

+18 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ 
void pci_update_resource(struct pci_dev *dev, int resno)

{

	struct pci_bus_region region;

	bool disable;

	u16 cmd;

	u32 new, check, mask;

	int reg;

	enum pci_bar_type type;
@@ -67,6 +69,18 @@ void pci_update_resource(struct pci_dev *dev, int resno) 
		new |= PCI_ROM_ADDRESS_ENABLE;

	}



	/*

	 * We can't update a 64-bit BAR atomically, so when possible,

	 * disable decoding so that a half-updated BAR won't conflict

	 * with another device.

	 */

	disable = (res->flags & IORESOURCE_MEM_64) && !dev->mmio_always_on;

	if (disable) {

		pci_read_config_word(dev, PCI_COMMAND, &cmd);

		pci_write_config_word(dev, PCI_COMMAND,

				      cmd & ~PCI_COMMAND_MEMORY);

	}



	pci_write_config_dword(dev, reg, new);

	pci_read_config_dword(dev, reg, &check);
@@ -84,6 +98,10 @@ void pci_update_resource(struct pci_dev *dev, int resno) 
			       "(high %#08x != %#08x)\n", resno, new, check);

		}

	}



	if (disable)

		pci_write_config_word(dev, PCI_COMMAND, cmd);



	res->flags &= ~IORESOURCE_UNSET;

	dev_dbg(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n",

		resno, res, (unsigned long long)region.start,