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commit 538ab07badd6858207fb187b42103dbf820864bc
Author: Jens Wiklander <jens.wiklander@linaro.org>
AuthorDate: Mon Mar 25 10:39:04 2024 +0100
Commit: Stefano Stabellini <stefano.stabellini@amd.com>
CommitDate: Wed Apr 3 16:20:17 2024 -0700

xen/arm: ffa: support FFA_FEATURES

Add support for the mandatory FF-A ABI function FFA_FEATURES.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
---
xen/arch/arm/tee/ffa.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)

diff --git a/xen/arch/arm/tee/ffa.c b/xen/arch/arm/tee/ffa.c
index 4f7775b8c8..8665201e34 100644
--- a/xen/arch/arm/tee/ffa.c
+++ b/xen/arch/arm/tee/ffa.c
@@ -192,6 +192,60 @@ out:
resp.a7 & mask);
}

+static void handle_features(struct cpu_user_regs *regs)
+{
+ uint32_t a1 = get_user_reg(regs, 1);
+ unsigned int n;
+
+ for ( n = 2; n <= 7; n++ )
+ {
+ if ( get_user_reg(regs, n) )
+ {
+ ffa_set_regs_error(regs, FFA_RET_NOT_SUPPORTED);
+ return;
+ }
+ }
+
+ switch ( a1 )
+ {
+ case FFA_ERROR:
+ case FFA_VERSION:
+ case FFA_SUCCESS_32:
+ case FFA_SUCCESS_64:
+ case FFA_FEATURES:
+ case FFA_ID_GET:
+ case FFA_RX_RELEASE:
+ case FFA_RXTX_UNMAP:
+ case FFA_MEM_RECLAIM:
+ case FFA_PARTITION_INFO_GET:
+ case FFA_MSG_SEND_DIRECT_REQ_32:
+ case FFA_MSG_SEND_DIRECT_REQ_64:
+ ffa_set_regs_success(regs, 0, 0);
+ break;
+ case FFA_MEM_SHARE_64:
+ case FFA_MEM_SHARE_32:
+ /*
+ * We currently don't support dynamically allocated buffers. Report
+ * that with 0 in bit[0] of w2.
+ */
+ ffa_set_regs_success(regs, 0, 0);
+ break;
+ case FFA_RXTX_MAP_64:
+ case FFA_RXTX_MAP_32:
+ /*
+ * We currently support 4k pages only, report that as 00 in
+ * bit[0:1] in w0. This needs to be revised if Xen page size
+ * differs from FFA_PAGE_SIZE (SZ_4K).
+ */
+ BUILD_BUG_ON(PAGE_SIZE != FFA_PAGE_SIZE);
+ ffa_set_regs_success(regs, 0, 0);
+ break;
+ default:
+ ffa_set_regs_error(regs, FFA_RET_NOT_SUPPORTED);
+ break;
+ }
+}
+
static bool ffa_handle_call(struct cpu_user_regs *regs)
{
uint32_t fid = get_user_reg(regs, 0);
@@ -212,6 +266,9 @@ static bool ffa_handle_call(struct cpu_user_regs *regs)
case FFA_ID_GET:
ffa_set_regs_success(regs, ffa_get_vm_id(d), 0);
return true;
+ case FFA_FEATURES:
+ handle_features(regs);
+ return true;
case FFA_RXTX_MAP_32:
case FFA_RXTX_MAP_64:
e = ffa_handle_rxtx_map(fid, get_user_reg(regs, 1),
--
generated by git-patchbot for /home/xen/git/xen.git#master