On Fri, Sep 29, 2023 at 03:03:35PM +0530, Kishon Vijay Abraham I wrote:
> 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.
It is sperated physical address space. So far, epc still not support map
two difference physcial address space into a bar.
So I have to use a sperate pci bar for doorbell.
Frank
>
>
> > + u32 doorbell_addr;
> > + u32 doorbell_data;
> > } __packed;
>
> Thanks,
> Kishon
