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| author |   Sudeep Holla <sudeep.holla@arm.com> | 2022-09-07 15:52:35 +0100 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2022-09-08 11:30:34 +0100 |
| commit | e57fba9105fac60d81a7ff2ce70d347d7ae95943 (patch) | |
| tree | 1005d5a07d0697d9f929ce7c97f80767f0567edb /drivers | |
| parent | firmware: arm_ffa: Add support for querying FF-A features (diff) | |
| download | linux-dev-e57fba9105fac60d81a7ff2ce70d347d7ae95943.tar.xz linux-dev-e57fba9105fac60d81a7ff2ce70d347d7ae95943.zip | |
firmware: arm_ffa: Use FFA_FEATURES to detect if native versions are supported
Currently, the ffa_dev->mode_32bit is use to detect if the native 64-bit
or 32-bit versions of FF-A ABI needs to be used. However for the FF-A
memory ABIs, it is not dependent on the ffa_device(i.e. the partition)
itself, but the partition manager(SPM).
So, the FFA_FEATURES can be use to detect if the native 64bit ABIs are
supported or not and appropriate calls can be made based on that.
Use FFA_FEATURES to detect if native versions of MEM_LEND or MEM_SHARE
are implemented and make of the same to use native memory ABIs later on.
Link: https://lore.kernel.org/r/20220907145240.1683088-6-sudeep.holla@arm.com
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/arm_ffa/driver.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index 81b8d578b6ea..37a8ee304508 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -163,6 +163,7 @@ struct ffa_drv_info { struct mutex tx_lock; /* lock to protect Tx buffer */ void *rx_buffer; void *tx_buffer; + bool mem_ops_native; }; static struct ffa_drv_info *drv_info; @@ -597,6 +598,13 @@ static int ffa_features(u32 func_feat_id, u32 input_props, return 0; } +static void ffa_set_up_mem_ops_native_flag(void) +{ + if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) || + !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL)) + drv_info->mem_ops_native = true; +} + static u32 ffa_api_version_get(void) { return drv_info->version; @@ -638,10 +646,10 @@ static int ffa_sync_send_receive(struct ffa_device *dev, static int ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args) { - if (dev->mode_32bit) - return ffa_memory_ops(FFA_MEM_SHARE, args); + if (drv_info->mem_ops_native) + return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args); - return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args); + return ffa_memory_ops(FFA_MEM_SHARE, args); } static int @@ -654,10 +662,10 @@ ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args) * however on systems without a hypervisor the responsibility * falls to the calling kernel driver to prevent access. */ - if (dev->mode_32bit) - return ffa_memory_ops(FFA_MEM_LEND, args); + if (drv_info->mem_ops_native) + return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args); - return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args); + return ffa_memory_ops(FFA_MEM_LEND, args); } static const struct ffa_dev_ops ffa_ops = { @@ -768,6 +776,8 @@ static int __init ffa_init(void) ffa_setup_partitions(); + ffa_set_up_mem_ops_native_flag(); + return 0; free_pages: if (drv_info->tx_buffer) |