From: Li Chen <lchen@xxxxxxxxxxxxx>
Before this commit, epf cannot set BAR to be prefetchable.
Prefetchable BAR can also help epf device to use bridge's
prefetch memory window.
Signed-off-by: Li Chen <lchen@xxxxxxxxxxxxx>
---
Changes in v2:
Remove Gerrit Change-id
Changes in v3:
capitalize "BAR" in the subject and commit log as suggested by Bjorn.
Changes in v4:
This patch context doesn't change but resend with my Zoho mail account in that previous
company mail will contain un-removeable proprietary messages.
Add "From:" to the first line of the message body.
drivers/pci/endpoint/functions/pci-epf-test.c | 4 ++++
include/linux/pci-epc.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 90d84d3bc868..96489cfdf58d 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -817,15 +817,19 @@ static void pci_epf_configure_bar(struct pci_epf *epf,
{
struct pci_epf_bar *epf_bar;
bool bar_fixed_64bit;
+ bool bar_prefetch;
int i;
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
epf_bar = &epf->bar[i];
bar_fixed_64bit = !!(epc_features->bar_fixed_64bit & (1 << i));
+ bar_prefetch = !!(epc_features->bar_prefetch & (1 << i));
if (bar_fixed_64bit)
epf_bar->flags |= PCI_BASE_ADDRESS_MEM_TYPE_64;
if (epc_features->bar_fixed_size[i])
bar_size[i] = epc_features->bar_fixed_size[i];
+ if (bar_prefetch)
+ epf_bar->flags |= PCI_BASE_ADDRESS_MEM_PREFETCH;
}
}
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index a48778e1a4ee..825632d581d0 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -161,6 +161,7 @@ struct pci_epc {
* @msix_capable: indicate if the endpoint function has MSI-X capability
* @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver
* @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs
+ * @bar_prefetch: bitmap to indicate prefetchable BARs
* @bar_fixed_size: Array specifying the size supported by each BAR
* @align: alignment size required for BAR buffer allocation
*/
@@ -171,6 +172,7 @@ struct pci_epc_features {
unsigned int msix_capable : 1;
u8 reserved_bar;
u8 bar_fixed_64bit;
+ u8 bar_prefetch;
u64 bar_fixed_size[PCI_STD_NUM_BARS];
size_t align;
};
--
2.34.1
