PCI: endpoint: BAR width should not depend on sizeof dma_addr_t

If a BAR supports 64-bit width or not depends on the hardware,
and should thus not depend on sizeof(dma_addr_t).

If a certain hardware doesn't support 64-bit BARs, its
epc->ops->set_bar() implementation should return -EINVAL
when PCI_BASE_ADDRESS_MEM_TYPE_64 is set.

We can't change pci_epc_set_bar() to only set
PCI_BASE_ADDRESS_MEM_TYPE_64 based on size, since if the user,
for some reason, wants to configure a BAR with a 64-bit width,
even though the BAR size is less than 4 GB, he should be able
to do that.

However, since pci-epf-test is simply a test and not an API,
we can set PCI_BASE_ADDRESS_MEM_TYPE_64 in pci-epf-test itself
only based on size.

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 64d8a17f8094..f6c0c59b1bc8 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -70,7 +70,7 @@ struct pci_epf_test_data {
         bool            linkup_notifier;
 };
 
-static int bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
+static size_t bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
 
 static int pci_epf_test_copy(struct pci_epf_test *epf_test)
 {
@@ -367,12 +367,14 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
         struct pci_epf_test *epf_test = epf_get_drvdata(epf);
         enum pci_barno test_reg_bar = epf_test->test_reg_bar;
 
-        flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32;
-        if (sizeof(dma_addr_t) == 0x8)
-                flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
-
         for (bar = BAR_0; bar <= BAR_5; bar++) {
                 epf_bar = &epf->bar[bar];
+
+                flags = PCI_BASE_ADDRESS_SPACE_MEMORY;
+                flags |= upper_32_bits(epf_bar->size) ?
+                        PCI_BASE_ADDRESS_MEM_TYPE_64 :
+                        PCI_BASE_ADDRESS_MEM_TYPE_32;
+
                 ret = pci_epc_set_bar(epc, epf->func_no, bar,
                                       epf_bar->phys_addr,
                                       epf_bar->size, flags);