Hi Frank,
On 9/12/2023 3:39 AM, Frank Li wrote:
Add three register: doorbell_bar, doorbell_addr, doorbell_data,
doorbell_done. Call pci_epf_alloc_doorbell() all a doorbell address space.
Root complex(RC) side driver can trigger pci-epc-test's doorbell callback
handler by write doorbell_data to mapped doorbell_bar's address space.
pci-epc-test will set doorbell_done in doorbell callback.
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
drivers/pci/endpoint/functions/pci-epf-test.c | 59 ++++++++++++++++++-
1 file changed, 58 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 1f0d2b84296a3..566549919b87b 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -11,6 +11,7 @@
#include <linux/dmaengine.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/msi.h>
#include <linux/slab.h>
#include <linux/pci_ids.h>
#include <linux/random.h>
@@ -39,17 +40,21 @@
#define STATUS_IRQ_RAISED BIT(6)
#define STATUS_SRC_ADDR_INVALID BIT(7)
#define STATUS_DST_ADDR_INVALID BIT(8)
+#define STATUS_DOORBELL_SUCCESS BIT(9)
#define FLAG_USE_DMA BIT(0)
#define TIMER_RESOLUTION 1
+#define MAGIC_VERSION_MASK GENMASK(7, 0)
+
static struct workqueue_struct *kpcitest_workqueue;
struct pci_epf_test {
void *reg[PCI_STD_NUM_BARS];
struct pci_epf *epf;
enum pci_barno test_reg_bar;
+ enum pci_barno doorbell_bar;
size_t msix_table_offset;
struct delayed_work cmd_handler;
struct dma_chan *dma_chan_tx;
@@ -74,6 +79,9 @@ struct pci_epf_test_reg {
u32 irq_type;
u32 irq_number;
u32 flags;
+ u32 doorbell_bar;
You could extend test_reg_bar for doorbell to avoid using additional BAR.
+ u32 doorbell_addr;
+ u32 doorbell_data;
} __packed;
Thanks,
Kishon
