diff options
| author | Ioana Ciornei <ioana.ciornei@nxp.com> | 2021-01-14 19:07:50 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-27 15:13:52 +0100 |
| commit | 2cf1e703f066cfa82eb5a358ae84c29fe15a3b3a (patch) | |
| tree | 93d20834f3d19ba11f5d84774d5fd7390cd33a69 /drivers/bus/fsl-mc/dprc-driver.c | |
| parent | 46707989269a251e5e4ca295975525605bc8afef (diff) | |
bus: fsl-mc: add fsl-mc userspace support
Adding userspace support for the MC (Management Complex) means exporting
an ioctl capable device file representing the root resource container.
This new functionality in the fsl-mc bus driver intends to provide
userspace applications an interface to interact with the MC firmware.
Commands that are composed in userspace are sent to the MC firmware
through the FSL_MC_SEND_MC_COMMAND ioctl. By default the implicit MC
I/O portal is used for this operation, but if the implicit one is busy,
a dynamic portal is allocated and then freed upon execution.
The command received through the ioctl interface is checked against a
known whitelist of accepted MC commands. Commands that attempt a change
in hardware configuration will need CAP_NET_ADMIN, while commands used
in debugging do not need it.
Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-4-ciorneiioana@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bus/fsl-mc/dprc-driver.c')
| -rw-r--r-- | drivers/bus/fsl-mc/dprc-driver.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c index 68488a7ad0d6..ccec375095f2 100644 --- a/drivers/bus/fsl-mc/dprc-driver.c +++ b/drivers/bus/fsl-mc/dprc-driver.c @@ -603,6 +603,7 @@ int dprc_setup(struct fsl_mc_device *mc_dev) struct irq_domain *mc_msi_domain; bool mc_io_created = false; bool msi_domain_set = false; + bool uapi_created = false; u16 major_ver, minor_ver; size_t region_size; int error; @@ -635,6 +636,11 @@ int dprc_setup(struct fsl_mc_device *mc_dev) return error; mc_io_created = true; + } else { + error = fsl_mc_uapi_create_device_file(mc_bus); + if (error < 0) + return -EPROBE_DEFER; + uapi_created = true; } mc_msi_domain = fsl_mc_find_msi_domain(&mc_dev->dev); @@ -692,6 +698,9 @@ error_cleanup_msi_domain: mc_dev->mc_io = NULL; } + if (uapi_created) + fsl_mc_uapi_remove_device_file(mc_bus); + return error; } EXPORT_SYMBOL_GPL(dprc_setup); @@ -763,6 +772,7 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev) int dprc_cleanup(struct fsl_mc_device *mc_dev) { + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); int error; /* this function should be called only for DPRCs, it @@ -793,6 +803,8 @@ int dprc_cleanup(struct fsl_mc_device *mc_dev) if (!fsl_mc_is_root_dprc(&mc_dev->dev)) { fsl_destroy_mc_io(mc_dev->mc_io); mc_dev->mc_io = NULL; + } else { + fsl_mc_uapi_remove_device_file(mc_bus); } return 0; |