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This maximum size is not checked when page-aligning the RX/TX buffer size, and FFA_RXTX_MAP may fail when passed a size greater than the maximum. Decode the maximum buffer size returned from FFA_FEATURES and limit the buffer size based on this value if it is non-zero (zero indicates no maximum). Include verification that the max returned by the SPMC is larger than the minimum, otherwise use the minimum. While there, also update RXTX_MAP_MIN_BUFSZ() to use FIELD_GET() for consistency. Fixes: 83210251fd70 ("firmware: arm_ffa: Use the correct buffer size during RXTX_MAP") Assisted-by: Claude:claude-opus-4-8 Signed-off-by: Seth Forshee --- drivers/firmware/arm_ffa/driver.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index b9f17fda7243..dc45724a29ba 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include @@ -55,7 +56,9 @@ (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r))) #define RXTX_MAP_MIN_BUFSZ_MASK GENMASK(1, 0) -#define RXTX_MAP_MIN_BUFSZ(x) ((x) & RXTX_MAP_MIN_BUFSZ_MASK) +#define RXTX_MAP_MAX_BUFSZ_MASK GENMASK(31, 16) +#define RXTX_MAP_MIN_BUFSZ(x) (FIELD_GET(RXTX_MAP_MIN_BUFSZ_MASK, (x))) +#define RXTX_MAP_MAX_BUFSZ(x) (FIELD_GET(RXTX_MAP_MAX_BUFSZ_MASK, (x))) #define FFA_MAX_NOTIFICATIONS 64 @@ -2086,11 +2089,13 @@ static void ffa_notifications_setup(void) ffa_notifications_cleanup(); } +#define FFA_SUPPORTS_RXTX_MAX_BUFSZ(version) ((version) > FFA_VERSION_1_1) + static int __init ffa_init(void) { int ret; u32 buf_sz; - size_t rxtx_bufsz = SZ_4K; + size_t rxtx_bufsz = SZ_4K, rxtx_max_bufsz = 0; ret = ffa_transport_init(&invoke_ffa_fn); if (ret) @@ -2118,9 +2123,29 @@ static int __init ffa_init(void) rxtx_bufsz = SZ_16K; else rxtx_bufsz = SZ_4K; + + if (FFA_SUPPORTS_RXTX_MAX_BUFSZ(drv_info->version)) { + rxtx_max_bufsz = (size_t)RXTX_MAP_MAX_BUFSZ(buf_sz) * SZ_4K; + if (rxtx_max_bufsz != 0 && rxtx_max_bufsz < rxtx_bufsz) { + /* + * Per spec the maximum must be >= the minimum, or + * else zero if there is no size limit. If the SPMC + * violates this constraint, use the minimum as the + * effective maximum. + */ + rxtx_max_bufsz = rxtx_bufsz; + } + } } + /* + * alloc_pages_exact() allocates full pages. Use the full allocated + * space up to the max supported by the SPMC. + */ rxtx_bufsz = PAGE_ALIGN(rxtx_bufsz); + if (rxtx_max_bufsz) + rxtx_bufsz = min(rxtx_bufsz, rxtx_max_bufsz); + drv_info->rxtx_bufsz = rxtx_bufsz; drv_info->rx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); if (!drv_info->rx_buffer) { -- 2.43.0