vdasa@xxxxxxxxxx writes:
> From: Vishnu Dasa <vdasa@xxxxxxxxxx>
>
> Add support for ARM64 architecture so that the driver can now be built
> and VMCI device can be used.
>
> Update Kconfig file to allow the driver to be built on ARM64 as well.
> Fail vmci_guest_probe_device() on ARM64 if the device does not support
> MMIO register access. Lastly, add virtualization specific barriers
> which map to actual memory barrier instructions on ARM64, because it
> is required in case of ARM64 for queuepair (de)queuing.
>
FWIW, it seems you're doing three things at once, better split this into
a 3-patch series.
> Reviewed-by: Bryan Tan <bryantan@xxxxxxxxxx>
> Reviewed-by: Cyprien Laplace <claplace@xxxxxxxxxx>
> Signed-off-by: Vishnu Dasa <vdasa@xxxxxxxxxx>
> ---
> drivers/misc/vmw_vmci/Kconfig | 2 +-
> drivers/misc/vmw_vmci/vmci_guest.c | 4 ++++
> drivers/misc/vmw_vmci/vmci_queue_pair.c | 12 ++++++++++++
> 3 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/vmw_vmci/Kconfig b/drivers/misc/vmw_vmci/Kconfig
> index 605794aadf11..b6d4d7fd686a 100644
> --- a/drivers/misc/vmw_vmci/Kconfig
> +++ b/drivers/misc/vmw_vmci/Kconfig
> @@ -5,7 +5,7 @@
>
> config VMWARE_VMCI
> tristate "VMware VMCI Driver"
> - depends on X86 && PCI
> + depends on (X86 || ARM64) && !CPU_BIG_ENDIAN && PCI
> help
> This is VMware's Virtual Machine Communication Interface. It enables
> high-speed communication between host and guest in a virtual
> diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
> index 57a6157209a1..aa7b05de97dd 100644
> --- a/drivers/misc/vmw_vmci/vmci_guest.c
> +++ b/drivers/misc/vmw_vmci/vmci_guest.c
> @@ -614,6 +614,10 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
> }
>
> if (!mmio_base) {
> + if (IS_ENABLED(CONFIG_ARM64)) {
> + dev_err(&pdev->dev, "MMIO base is invalid\n");
> + return -ENXIO;
> + }
> error = pcim_iomap_regions(pdev, BIT(0), KBUILD_MODNAME);
> if (error) {
> dev_err(&pdev->dev, "Failed to reserve/map IO regions\n");
> diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
> index 94ebf7f3fd58..8f2de1893245 100644
> --- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
> +++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
> @@ -2577,6 +2577,12 @@ static ssize_t qp_enqueue_locked(struct vmci_queue *produce_q,
> if (result < VMCI_SUCCESS)
> return result;
>
> + /*
> + * This virt_wmb() ensures that data written to the queue
> + * is observable before the new producer_tail is.
> + */
> + virt_wmb();
> +
> vmci_q_header_add_producer_tail(produce_q->q_header, written,
> produce_q_size);
> return written;
> @@ -2620,6 +2626,12 @@ static ssize_t qp_dequeue_locked(struct vmci_queue *produce_q,
> if (buf_ready < VMCI_SUCCESS)
> return (ssize_t) buf_ready;
>
> + /*
> + * This virt_rmb() ensures that data from the queue will be read
> + * after we have determined how much is ready to be consumed.
> + */
> + virt_rmb();
> +
> read = (size_t) (buf_ready > buf_size ? buf_size : buf_ready);
> head = vmci_q_header_consumer_head(produce_q->q_header);
> if (likely(head + read < consume_q_size)) {
--
Vitaly
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