diff options
| author | Julian Wiedmann <jwi@linux.ibm.com> | 2020-03-20 14:00:00 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-04-06 13:13:50 +0200 |
| commit | d8564e19da8c8b31c7fc160942f95b113f554211 (patch) | |
| tree | aed39c231d9207fee043094363b911e3cbf663f8 /arch/s390 | |
| parent | ad96401cdb147efd486761db8159d5e3489c9ca8 (diff) | |
s390/qdio: allow for non-contiguous SBAL array in init_data
Upper-layer drivers allocate their SBALs by calling qdio_alloc_buffers()
for each individual queue. But when later passing the SBAL addresses to
qdio_establish(), they need to be in a single array of pointers.
So if the driver uses multiple Input or Output queues, it needs to
allocate a temporary array just to present all its SBAL pointers in this
layout.
This patch slightly changes the format of the QDIO initialization data,
so that drivers can pass a per-queue array where each element points to
a queue's SBAL array.
zfcp doesn't use multiple queues, so the impact there is trivial.
For qeth this brings a nice reduction in complexity, and removes
a page-sized allocation.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/qdio.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/s390/include/asm/qdio.h b/arch/s390/include/asm/qdio.h index 8a0f4d014680..2b6292ed0fb6 100644 --- a/arch/s390/include/asm/qdio.h +++ b/arch/s390/include/asm/qdio.h @@ -341,8 +341,8 @@ typedef void qdio_handler_t(struct ccw_device *, unsigned int, int, * @irq_poll: Data IRQ polling handler (NULL when not supported) * @scan_threshold: # of in-use buffers that triggers scan on output queue * @int_parm: interruption parameter - * @input_sbal_addr_array: address of no_input_qs * 128 pointers - * @output_sbal_addr_array: address of no_output_qs * 128 pointers + * @input_sbal_addr_array: per-queue array, each element points to 128 SBALs + * @output_sbal_addr_array: per-queue array, each element points to 128 SBALs * @output_sbal_state_array: no_output_qs * 128 state info (for CQ or NULL) */ struct qdio_initialize { @@ -362,8 +362,8 @@ struct qdio_initialize { void (*irq_poll)(struct ccw_device *cdev, unsigned long data); unsigned int scan_threshold; unsigned long int_parm; - struct qdio_buffer **input_sbal_addr_array; - struct qdio_buffer **output_sbal_addr_array; + struct qdio_buffer ***input_sbal_addr_array; + struct qdio_buffer ***output_sbal_addr_array; struct qdio_outbuf_state *output_sbal_state_array; }; |