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Subject[PATCH v5 01/12] PCI: endpoint: BAR width should not depend on sizeof dma_addr_t
Date
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>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 12 +++++++-----
1 file 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);
--
2.14.2
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