ahci: fix FIS I bit and PIO Setup FIS interrupt

The "I" bit in PIO Setup and D2H FISes is exclusively a device concept
and the irqstatus register in the controller does not matter.  The SATA
spec says when it should be one; for D2H FISes in practice it is always
set, while the PIO Setup FIS has several subcases that are documented in
the patch.

Also, the PIO Setup FIS interrupt is actually generated _after_ data
has been received.

Someone should probably spend some time reading the SATA specification and
figuring out the more obscure fields in the PIO Setup FIS, but this is enough
to fix SeaBIOS booting from ATAPI CD-ROMs over an AHCI controller.

Fixes: 956556e131e35f387ac482ad7b41151576fef057
Reported-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20180622165159.19863-1-pbonzini@redhat.com
[Minor edit to avoid ATAPI comment ambiguity. --js]
Signed-off-by: John Snow <jsnow@redhat.com>

1 files changed, 16 insertions, 9 deletions

diff --git a/tests/libqos/ahci.c b/tests/libqos/ahci.c
index 7264e085d0..42d3f76933 100644
--- a/tests/libqos/ahci.c
+++ b/tests/libqos/ahci.c
@@ -651,10 +651,7 @@ void ahci_exec(AHCIQState *ahci, uint8_t port,
     /* Command creation */
     if (opts->atapi) {
         uint16_t bcl = opts->set_bcl ? opts->bcl : ATAPI_SECTOR_SIZE;
-        cmd = ahci_atapi_command_create(op, bcl);
-        if (opts->atapi_dma) {
-            ahci_command_enable_atapi_dma(cmd);
-        }
+        cmd = ahci_atapi_command_create(op, bcl, opts->atapi_dma);
     } else {
         cmd = ahci_command_create(op);
     }
@@ -874,7 +871,6 @@ AHCICommand *ahci_command_create(uint8_t command_name)
     /* cmd->interrupts |= props->data ? AHCI_PX_IS_DPS : 0; */
     /* BUG: We expect the DMA Setup interrupt for DMA commands */
     /* cmd->interrupts |= props->dma ? AHCI_PX_IS_DSS : 0; */
-    cmd->interrupts |= props->pio ? AHCI_PX_IS_PSS : 0;
     cmd->interrupts |= props->ncq ? AHCI_PX_IS_SDBS : 0;
 
     command_header_init(cmd);
@@ -883,19 +879,24 @@ AHCICommand *ahci_command_create(uint8_t command_name)
     return cmd;
 }
 
-AHCICommand *ahci_atapi_command_create(uint8_t scsi_cmd, uint16_t bcl)
+AHCICommand *ahci_atapi_command_create(uint8_t scsi_cmd, uint16_t bcl, bool dma)
 {
     AHCICommand *cmd = ahci_command_create(CMD_PACKET);
     cmd->atapi_cmd = g_malloc0(16);
     cmd->atapi_cmd[0] = scsi_cmd;
     stw_le_p(&cmd->fis.lba_lo[1], bcl);
+    if (dma) {
+        ahci_command_enable_atapi_dma(cmd);
+    } else {
+        cmd->interrupts |= bcl ? AHCI_PX_IS_PSS : 0;
+    }
     return cmd;
 }
 
 void ahci_atapi_test_ready(AHCIQState *ahci, uint8_t port,
                            bool ready, uint8_t expected_sense)
 {
-    AHCICommand *cmd = ahci_atapi_command_create(CMD_ATAPI_TEST_UNIT_READY, 0);
+    AHCICommand *cmd = ahci_atapi_command_create(CMD_ATAPI_TEST_UNIT_READY, 0, false);
     ahci_command_set_size(cmd, 0);
     if (!ready) {
         cmd->interrupts |= AHCI_PX_IS_TFES;
@@ -937,7 +938,7 @@ void ahci_atapi_get_sense(AHCIQState *ahci, uint8_t port,
 
 void ahci_atapi_eject(AHCIQState *ahci, uint8_t port)
 {
-    AHCICommand *cmd = ahci_atapi_command_create(CMD_ATAPI_START_STOP_UNIT, 0);
+    AHCICommand *cmd = ahci_atapi_command_create(CMD_ATAPI_START_STOP_UNIT, 0, false);
     ahci_command_set_size(cmd, 0);
 
     cmd->atapi_cmd[4] = 0x02; /* loej = true */
@@ -949,7 +950,7 @@ void ahci_atapi_eject(AHCIQState *ahci, uint8_t port)
 
 void ahci_atapi_load(AHCIQState *ahci, uint8_t port)
 {
-    AHCICommand *cmd = ahci_atapi_command_create(CMD_ATAPI_START_STOP_UNIT, 0);
+    AHCICommand *cmd = ahci_atapi_command_create(CMD_ATAPI_START_STOP_UNIT, 0, false);
     ahci_command_set_size(cmd, 0);
 
     cmd->atapi_cmd[4] = 0x03; /* loej,start = true */
@@ -1098,6 +1099,12 @@ void ahci_command_set_sizes(AHCICommand *cmd, uint64_t xbytes,
     } else if (cmd->props->atapi) {
         ahci_atapi_set_size(cmd, xbytes);
     } else {
+        /* For writes, the PIO Setup FIS interrupt only comes from DRQs
+         * after the first.
+         */
+        if (cmd->props->pio && sect_count > (cmd->props->read ? 0 : 1)) {
+            cmd->interrupts |= AHCI_PX_IS_PSS;
+        }
         cmd->fis.count = sect_count;
     }
     cmd->header.prdtl = size_to_prdtl(cmd->xbytes, cmd->prd_size);