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authorKishon Vijay Abraham I <kishon@ti.com>2017-08-18 17:58:07 +0300
committerBjorn Helgaas <bhelgaas@google.com>2017-08-30 00:00:40 +0300
commit0b91516adc581636770ea4fb3efc022de057d074 (patch)
treecda7665a75f8616ae9410260238144a2c89f0efb /drivers/misc
parent13107c60681f19fec25af93de86442ac9373e43f (diff)
downloadlinux-0b91516adc581636770ea4fb3efc022de057d074.tar.xz
misc: pci_endpoint_test: Add support to not enable MSI interrupts
Some platforms like TI's K2G have a restriction that the host side buffer address should be aligned to either 1MB/2MB/4MB or 8MB addresses depending on how it is configured in the endpoint (Ref: 11.14.4.9.1 Outbound Address Translation in K2G TRM SPRUHY8F January 2016 – Revised May 2017). This restriction also applies to the MSI addresses provided by the RC. However it's not possible for the RC to know about this restriction and it may not provide 1MB/2MB/4MB or 8MB aligned address. So MSI interrupts should be disabled even if the K2G EP has MSI capabiltiy register. Add support to not enable MSI interrupts in pci_endpoint_test driver so that it can be used to test K2G EP. Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/pci_endpoint_test.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 5f6bd23ab657..5cbb25cf276c 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -97,6 +97,7 @@ struct pci_endpoint_test {
struct pci_endpoint_test_data {
enum pci_barno test_reg_bar;
size_t alignment;
+ bool no_msi;
};
static int bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
@@ -449,8 +450,9 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
{
int i;
int err;
- int irq;
+ int irq = 0;
int id;
+ bool no_msi = false;
char name[20];
enum pci_barno bar;
void __iomem *base;
@@ -475,6 +477,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
if (data) {
test_reg_bar = data->test_reg_bar;
test->alignment = data->alignment;
+ no_msi = data->no_msi;
}
init_completion(&test->irq_raised);
@@ -494,9 +497,11 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
pci_set_master(pdev);
- irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
- if (irq < 0)
- dev_err(dev, "failed to get MSI interrupts\n");
+ if (!no_msi) {
+ irq = pci_alloc_irq_vectors(pdev, 1, 32, PCI_IRQ_MSI);
+ if (irq < 0)
+ dev_err(dev, "failed to get MSI interrupts\n");
+ }
err = devm_request_irq(dev, pdev->irq, pci_endpoint_test_irqhandler,
IRQF_SHARED, DRV_MODULE_NAME, test);