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xen-pciback: return proper values during BAR sizing
Reads following writes with all address bits set to 1 should return all changeable address bits as one, not the BAR size (nor, as was the case for the upper half of 64-bit BARs, the high half of the region's end address). Presumably this didn't cause any problems so far because consumers use the value to calculate the size (usually via val & -val), and do nothing else with it. But also consider the exception here: Unimplemented BARs should always return all zeroes. And finally, the check for whether to return the sizing address on read for the ROM BAR should ignore all non-address bits, not just the ROM Enable one. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
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@ -145,7 +145,7 @@ static int rom_write(struct pci_dev *dev, int offset, u32 value, void *data)
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/* A write to obtain the length must happen as a 32-bit write.
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* This does not (yet) support writing individual bytes
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*/
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if (value == ~PCI_ROM_ADDRESS_ENABLE)
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if ((value | ~PCI_ROM_ADDRESS_MASK) == ~0U)
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bar->which = 1;
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else {
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u32 tmpval;
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@ -225,38 +225,42 @@ static inline void read_dev_bar(struct pci_dev *dev,
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(PCI_BASE_ADDRESS_SPACE_MEMORY |
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PCI_BASE_ADDRESS_MEM_TYPE_64))) {
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bar_info->val = res[pos - 1].start >> 32;
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bar_info->len_val = res[pos - 1].end >> 32;
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bar_info->len_val = -resource_size(&res[pos - 1]) >> 32;
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return;
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}
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}
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if (!res[pos].flags ||
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(res[pos].flags & (IORESOURCE_DISABLED | IORESOURCE_UNSET |
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IORESOURCE_BUSY)))
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return;
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bar_info->val = res[pos].start |
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(res[pos].flags & PCI_REGION_FLAG_MASK);
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bar_info->len_val = resource_size(&res[pos]);
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bar_info->len_val = -resource_size(&res[pos]) |
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(res[pos].flags & PCI_REGION_FLAG_MASK);
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}
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static void *bar_init(struct pci_dev *dev, int offset)
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{
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struct pci_bar_info *bar = kmalloc(sizeof(*bar), GFP_KERNEL);
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struct pci_bar_info *bar = kzalloc(sizeof(*bar), GFP_KERNEL);
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if (!bar)
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return ERR_PTR(-ENOMEM);
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read_dev_bar(dev, bar, offset, ~0);
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bar->which = 0;
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return bar;
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}
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static void *rom_init(struct pci_dev *dev, int offset)
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{
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struct pci_bar_info *bar = kmalloc(sizeof(*bar), GFP_KERNEL);
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struct pci_bar_info *bar = kzalloc(sizeof(*bar), GFP_KERNEL);
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if (!bar)
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return ERR_PTR(-ENOMEM);
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read_dev_bar(dev, bar, offset, ~PCI_ROM_ADDRESS_ENABLE);
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bar->which = 0;
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return bar;
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}
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