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drm/amdkfd: Fix kernel-queue wrapping bugs

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Avoid intermediate negative numbers when doing calculations with a mix
of signed and unsigned variables where implicit conversions can lead
to unexpected results.

When kernel queue buffer wraps around to 0, we need to check that rptr
won't be overwritten by the new packet.

Signed-off-by: Yong Zhao <yong.zhao@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Yong Zhao 2017-09-20 18:10:21 -04:00 committed by Oded Gabbay
parent b22666febf
commit cb1d996746
1 changed files with 15 additions and 3 deletions
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18
drivers/gpu/drm/amd/amdkfd/kfd_kernel_queue.c
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@ -210,6 +210,11 @@ static int acquire_packet_buffer(struct kernel_queue *kq,
uint32_t wptr, rptr;
unsigned int *queue_address;
/* When rptr == wptr, the buffer is empty.
* When rptr == wptr + 1, the buffer is full.
* It is always rptr that advances to the position of wptr, rather than
* the opposite. So we can only use up to queue_size_dwords - 1 dwords.
*/
rptr = *kq->rptr_kernel;
wptr = *kq->wptr_kernel;
queue_address = (unsigned int *)kq->pq_kernel_addr;
@ -219,11 +224,10 @@ static int acquire_packet_buffer(struct kernel_queue *kq,
pr_debug("wptr: %d\n", wptr);
pr_debug("queue_address 0x%p\n", queue_address);
available_size = (rptr - 1 - wptr + queue_size_dwords) %
available_size = (rptr + queue_size_dwords - 1 - wptr) %
queue_size_dwords;
if (packet_size_in_dwords >= queue_size_dwords ||
packet_size_in_dwords >= available_size) {
if (packet_size_in_dwords > available_size) {
/*
* make sure calling functions know
* acquire_packet_buffer() failed
@ -233,6 +237,14 @@ static int acquire_packet_buffer(struct kernel_queue *kq,
}
if (wptr + packet_size_in_dwords >= queue_size_dwords) {
/* make sure after rolling back to position 0, there is
* still enough space.
*/
if (packet_size_in_dwords >= rptr) {
*buffer_ptr = NULL;
return -ENOMEM;
}
/* fill nops, roll back and start at position 0 */
while (wptr > 0) {
queue_address[wptr] = kq->nop_packet;
wptr = (wptr + 1) % queue_size_dwords;