diff options
| author | Vishnu Dasa <vdasa@vmware.com> | 2022-04-14 12:33:16 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-24 17:32:14 +0200 |
| commit | 1f7142915d304804a9bd952245fce92786b1b62f (patch) | |
| tree | 97d3ca569f674df3ebcc7024d6a76ec1a7a98782 /drivers/misc/vmw_vmci | |
| parent | 5a0793ac66ac0e254d292f129a4d6c526f9f2aff (diff) | |
| download | linux-1f7142915d304804a9bd952245fce92786b1b62f.tar.gz | |
VMCI: Add support for ARM64
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.
Reviewed-by: Bryan Tan <bryantan@vmware.com>
Reviewed-by: Cyprien Laplace <claplace@vmware.com>
Signed-off-by: Vishnu Dasa <vdasa@vmware.com>
Link: https://lore.kernel.org/r/20220414193316.14356-1-vdasa@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/vmw_vmci')
| -rw-r--r-- | drivers/misc/vmw_vmci/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/misc/vmw_vmci/vmci_guest.c | 4 | ||||
| -rw-r--r-- | drivers/misc/vmw_vmci/vmci_queue_pair.c | 12 |
3 files changed, 17 insertions, 1 deletions
diff --git a/drivers/misc/vmw_vmci/Kconfig b/drivers/misc/vmw_vmci/Kconfig index 605794aadf118..b6d4d7fd686a5 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 57a6157209a19..aa7b05de97dd5 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 94ebf7f3fd58a..8f2de1893245a 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)) { |