megasas: Ignore duplicate init_firmware commands

The windows driver is sending several init_firmware commands
when in MSI-X mode. It is, however, using only the first
queue. So disregard any additional init_firmware commands
until the HBA is reset.
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/scsi/megasas.c

@@ -610,16 +610,19 @@ static int megasas_init_firmware(MegasasState *s, MegasasCmd *cmd)
 {
     PCIDevice *pcid = PCI_DEVICE(s);
     uint32_t pa_hi, pa_lo;
-    hwaddr iq_pa, initq_size;
-    struct mfi_init_qinfo *initq;
+    hwaddr iq_pa, initq_size = sizeof(struct mfi_init_qinfo);
+    struct mfi_init_qinfo *initq = NULL;
     uint32_t flags;
     int ret = MFI_STAT_OK;
 
+    if (s->reply_queue_pa) {
+        trace_megasas_initq_mapped(s->reply_queue_pa);
+        goto out;
+    }
     pa_lo = le32_to_cpu(cmd->frame->init.qinfo_new_addr_lo);
     pa_hi = le32_to_cpu(cmd->frame->init.qinfo_new_addr_hi);
     iq_pa = (((uint64_t) pa_hi << 32) | pa_lo);
     trace_megasas_init_firmware((uint64_t)iq_pa);
-    initq_size = sizeof(*initq);
     initq = pci_dma_map(pcid, iq_pa, &initq_size, 0);
     if (!initq || initq_size != sizeof(*initq)) {
         trace_megasas_initq_map_failed(cmd->index);

trace-events

@@ -697,6 +697,7 @@ lm32_uart_irq_state(int level) "irq state %d"
 megasas_init_firmware(uint64_t pa) "pa %" PRIx64 " "
 megasas_init_queue(uint64_t queue_pa, int queue_len, uint64_t head, uint64_t tail, uint32_t flags) "queue at %" PRIx64 " len %d head %" PRIx64 " tail %" PRIx64 " flags %x"
 megasas_initq_map_failed(int frame) "scmd %d: failed to map queue"
+megasas_initq_mapped(uint64_t pa) "queue already mapped at %" PRIx64 ""
 megasas_initq_mismatch(int queue_len, int fw_cmds) "queue size %d max fw cmds %d"
 megasas_qf_found(unsigned int index, uint64_t pa) "mapped frame %x pa %" PRIx64 ""
 megasas_qf_new(unsigned int index, void *cmd) "return new frame %x cmd %p"