diff options
| author | Kishon Vijay Abraham I <kishon@ti.com> | 2021-02-02 01:27:54 +0530 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-02-23 14:10:17 -0600 |
| commit | 959a48d0eac0321948c9f3d1707ba22c100e92d5 (patch) | |
| tree | 3d9cf82fc7bdb42f2a39f76d2f2d5b252944927e /drivers/pci | |
| parent | 13bccf873808ac9516089760efce7ea18b7484a9 (diff) | |
| download | linux-959a48d0eac0321948c9f3d1707ba22c100e92d5.tar.bz2 | |
PCI: endpoint: Make *_get_first_free_bar() take into account 64 bit BAR
pci_epc_get_first_free_bar() uses only "reserved_bar" member in
epc_features to get the first unreserved BAR. However if the reserved BAR
is also a 64-bit BAR, then the next BAR shouldn't be returned (since 64-bit
BAR uses two BARs).
Make pci_epc_get_first_free_bar() take into account 64 bit BAR while
returning the first free unreserved BAR.
Link: https://lore.kernel.org/r/20210201195809.7342-3-kishon@ti.com
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/endpoint/pci-epc-core.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index cadd3db0cbb0..25e57672e1a1 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -93,12 +93,20 @@ EXPORT_SYMBOL_GPL(pci_epc_get); unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features) { - int free_bar; + unsigned long free_bar; if (!epc_features) return 0; - free_bar = ffz(epc_features->reserved_bar); + /* Find if the reserved BAR is also a 64-bit BAR */ + free_bar = epc_features->reserved_bar & epc_features->bar_fixed_64bit; + + /* Set the adjacent bit if the reserved BAR is also a 64-bit BAR */ + free_bar <<= 1; + free_bar |= epc_features->reserved_bar; + + /* Now find the free BAR */ + free_bar = ffz(free_bar); if (free_bar > 5) return 0; |