Merge tag 'ide-pull-request' of https://gitlab.com/jsnow/qemu into staging

IDE Pull request

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# gpg: Signature made Wed 06 Sep 2023 23:42:14 EDT
# gpg:                using RSA key F9B7ABDBBCACDF95BE76CBD07DEF8106AAFC390E
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# Primary key fingerprint: FAEB 9711 A12C F475 812F  18F2 88A9 064D 1835 61EB
#      Subkey fingerprint: F9B7 ABDB BCAC DF95 BE76  CBD0 7DEF 8106 AAFC 390E

* tag 'ide-pull-request' of https://gitlab.com/jsnow/qemu:
  hw/ide/ahci: fix broken SError handling
  hw/ide/ahci: fix ahci_write_fis_sdb()
  hw/ide/ahci: PxCI should not get cleared when ERR_STAT is set
  hw/ide/ahci: PxSACT and PxCI is cleared when PxCMD.ST is cleared
  hw/ide/ahci: simplify and document PxCI handling
  hw/ide/ahci: write D2H FIS when processing NCQ command
  hw/ide/core: set ERR_STAT in unsupported command completion

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

4 files changed, 163 insertions, 63 deletions

diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 48d550f633..d0a774bc17 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -41,9 +41,10 @@
 #include "trace.h"
 
 static void check_cmd(AHCIState *s, int port);
-static int handle_cmd(AHCIState *s, int port, uint8_t slot);
+static void handle_cmd(AHCIState *s, int port, uint8_t slot);
 static void ahci_reset_port(AHCIState *s, int port);
-static bool ahci_write_fis_d2h(AHCIDevice *ad);
+static bool ahci_write_fis_d2h(AHCIDevice *ad, bool d2h_fis_i);
+static void ahci_clear_cmd_issue(AHCIDevice *ad, uint8_t slot);
 static void ahci_init_d2h(AHCIDevice *ad);
 static int ahci_dma_prepare_buf(const IDEDMA *dma, int32_t limit);
 static bool ahci_map_clb_address(AHCIDevice *ad);
@@ -328,6 +329,11 @@ static void ahci_port_write(AHCIState *s, int port, int offset, uint32_t val)
         ahci_check_irq(s);
         break;
     case AHCI_PORT_REG_CMD:
+        if ((pr->cmd & PORT_CMD_START) && !(val & PORT_CMD_START)) {
+            pr->scr_act = 0;
+            pr->cmd_issue = 0;
+        }
+
         /* Block any Read-only fields from being set;
          * including LIST_ON and FIS_ON.
          * The spec requires to set ICC bits to zero after the ICC change
@@ -591,9 +597,8 @@ static void check_cmd(AHCIState *s, int port)
 
     if ((pr->cmd & PORT_CMD_START) && pr->cmd_issue) {
         for (slot = 0; (slot < 32) && pr->cmd_issue; slot++) {
-            if ((pr->cmd_issue & (1U << slot)) &&
-                !handle_cmd(s, port, slot)) {
-                pr->cmd_issue &= ~(1U << slot);
+            if (pr->cmd_issue & (1U << slot)) {
+                handle_cmd(s, port, slot);
             }
         }
     }
@@ -618,7 +623,7 @@ static void ahci_init_d2h(AHCIDevice *ad)
         return;
     }
 
-    if (ahci_write_fis_d2h(ad)) {
+    if (ahci_write_fis_d2h(ad, true)) {
         ad->init_d2h_sent = true;
         /* We're emulating receiving the first Reg H2D Fis from the device;
          * Update the SIG register, but otherwise proceed as normal. */
@@ -801,8 +806,14 @@ static void ahci_write_fis_sdb(AHCIState *s, NCQTransferState *ncq_tfs)
     pr->scr_act &= ~ad->finished;
     ad->finished = 0;
 
-    /* Trigger IRQ if interrupt bit is set (which currently, it always is) */
-    if (sdb_fis->flags & 0x40) {
+    /*
+     * TFES IRQ is always raised if ERR_STAT is set, regardless of I bit.
+     * If ERR_STAT is not set, trigger SDBS IRQ if interrupt bit is set
+     * (which currently, it always is).
+     */
+    if (sdb_fis->status & ERR_STAT) {
+        ahci_trigger_irq(s, ad, AHCI_PORT_IRQ_BIT_TFES);
+    } else if (sdb_fis->flags & 0x40) {
         ahci_trigger_irq(s, ad, AHCI_PORT_IRQ_BIT_SDBS);
     }
 }
@@ -850,7 +861,7 @@ static void ahci_write_fis_pio(AHCIDevice *ad, uint16_t len, bool pio_fis_i)
     }
 }
 
-static bool ahci_write_fis_d2h(AHCIDevice *ad)
+static bool ahci_write_fis_d2h(AHCIDevice *ad, bool d2h_fis_i)
 {
     AHCIPortRegs *pr = &ad->port_regs;
     uint8_t *d2h_fis;
@@ -864,7 +875,7 @@ static bool ahci_write_fis_d2h(AHCIDevice *ad)
     d2h_fis = &ad->res_fis[RES_FIS_RFIS];
 
     d2h_fis[0] = SATA_FIS_TYPE_REGISTER_D2H;
-    d2h_fis[1] = (1 << 6); /* interrupt bit */
+    d2h_fis[1] = d2h_fis_i ? (1 << 6) : 0; /* interrupt bit */
     d2h_fis[2] = s->status;
     d2h_fis[3] = s->error;
 
@@ -890,7 +901,10 @@ static bool ahci_write_fis_d2h(AHCIDevice *ad)
         ahci_trigger_irq(ad->hba, ad, AHCI_PORT_IRQ_BIT_TFES);
     }
 
-    ahci_trigger_irq(ad->hba, ad, AHCI_PORT_IRQ_BIT_DHRS);
+    if (d2h_fis_i) {
+        ahci_trigger_irq(ad->hba, ad, AHCI_PORT_IRQ_BIT_DHRS);
+    }
+
     return true;
 }
 
@@ -998,7 +1012,6 @@ static void ncq_err(NCQTransferState *ncq_tfs)
 
     ide_state->error = ABRT_ERR;
     ide_state->status = READY_STAT | ERR_STAT;
-    ncq_tfs->drive->port_regs.scr_err |= (1 << ncq_tfs->tag);
     qemu_sglist_destroy(&ncq_tfs->sglist);
     ncq_tfs->used = 0;
 }
@@ -1008,7 +1021,7 @@ static void ncq_finish(NCQTransferState *ncq_tfs)
     /* If we didn't error out, set our finished bit. Errored commands
      * do not get a bit set for the SDB FIS ACT register, nor do they
      * clear the outstanding bit in scr_act (PxSACT). */
-    if (!(ncq_tfs->drive->port_regs.scr_err & (1 << ncq_tfs->tag))) {
+    if (ncq_tfs->used) {
         ncq_tfs->drive->finished |= (1 << ncq_tfs->tag);
     }
 
@@ -1120,6 +1133,24 @@ static void process_ncq_command(AHCIState *s, int port, const uint8_t *cmd_fis,
         return;
     }
 
+    /*
+     * A NCQ command clears the bit in PxCI after the command has been QUEUED
+     * successfully (ERROR not set, BUSY and DRQ cleared).
+     *
+     * For NCQ commands, PxCI will always be cleared here.
+     *
+     * (Once the NCQ command is COMPLETED, the device will send a SDB FIS with
+     * the interrupt bit set, which will clear PxSACT and raise an interrupt.)
+     */
+    ahci_clear_cmd_issue(ad, slot);
+
+    /*
+     * In reality, for NCQ commands, PxCI is cleared after receiving a D2H FIS
+     * without the interrupt bit set, but since ahci_write_fis_d2h() can raise
+     * an IRQ on error, we need to call them in reverse order.
+     */
+    ahci_write_fis_d2h(ad, false);
+
     ncq_tfs->used = 1;
     ncq_tfs->drive = ad;
     ncq_tfs->slot = slot;
@@ -1192,6 +1223,7 @@ static void handle_reg_h2d_fis(AHCIState *s, int port,
 {
     IDEState *ide_state = &s->dev[port].port.ifs[0];
     AHCICmdHdr *cmd = get_cmd_header(s, port, slot);
+    AHCIDevice *ad = &s->dev[port];
     uint16_t opts = le16_to_cpu(cmd->opts);
 
     if (cmd_fis[1] & 0x0F) {
@@ -1268,11 +1300,19 @@ static void handle_reg_h2d_fis(AHCIState *s, int port,
     /* Reset transferred byte counter */
     cmd->status = 0;
 
+    /*
+     * A non-NCQ command clears the bit in PxCI after the command has COMPLETED
+     * successfully (ERROR not set, BUSY and DRQ cleared).
+     *
+     * For non-NCQ commands, PxCI will always be cleared by ahci_cmd_done().
+     */
+    ad->busy_slot = slot;
+
     /* We're ready to process the command in FIS byte 2. */
     ide_bus_exec_cmd(&s->dev[port].port, cmd_fis[2]);
 }
 
-static int handle_cmd(AHCIState *s, int port, uint8_t slot)
+static void handle_cmd(AHCIState *s, int port, uint8_t slot)
 {
     IDEState *ide_state;
     uint64_t tbl_addr;
@@ -1283,12 +1323,12 @@ static int handle_cmd(AHCIState *s, int port, uint8_t slot)
     if (s->dev[port].port.ifs[0].status & (BUSY_STAT|DRQ_STAT)) {
         /* Engine currently busy, try again later */
         trace_handle_cmd_busy(s, port);
-        return -1;
+        return;
     }
 
     if (!s->dev[port].lst) {
         trace_handle_cmd_nolist(s, port);
-        return -1;
+        return;
     }
     cmd = get_cmd_header(s, port, slot);
     /* remember current slot handle for later */
@@ -1298,7 +1338,7 @@ static int handle_cmd(AHCIState *s, int port, uint8_t slot)
     ide_state = &s->dev[port].port.ifs[0];
     if (!ide_state->blk) {
         trace_handle_cmd_badport(s, port);
-        return -1;
+        return;
     }
 
     tbl_addr = le64_to_cpu(cmd->tbl_addr);
@@ -1307,7 +1347,7 @@ static int handle_cmd(AHCIState *s, int port, uint8_t slot)
                              DMA_DIRECTION_TO_DEVICE, MEMTXATTRS_UNSPECIFIED);
     if (!cmd_fis) {
         trace_handle_cmd_badfis(s, port);
-        return -1;
+        return;
     } else if (cmd_len != 0x80) {
         ahci_trigger_irq(s, &s->dev[port], AHCI_PORT_IRQ_BIT_HBFS);
         trace_handle_cmd_badmap(s, port, cmd_len);
@@ -1331,15 +1371,6 @@ static int handle_cmd(AHCIState *s, int port, uint8_t slot)
 out:
     dma_memory_unmap(s->as, cmd_fis, cmd_len, DMA_DIRECTION_TO_DEVICE,
                      cmd_len);
-
-    if (s->dev[port].port.ifs[0].status & (BUSY_STAT|DRQ_STAT)) {
-        /* async command, complete later */
-        s->dev[port].busy_slot = slot;
-        return -1;
-    }
-
-    /* done handling the command */
-    return 0;
 }
 
 /* Transfer PIO data between RAM and device */
@@ -1493,22 +1524,39 @@ static int ahci_dma_rw_buf(const IDEDMA *dma, bool is_write)
     return 1;
 }
 
+static void ahci_clear_cmd_issue(AHCIDevice *ad, uint8_t slot)
+{
+    IDEState *ide_state = &ad->port.ifs[0];
+
+    if (!(ide_state->status & ERR_STAT) &&
+        !(ide_state->status & (BUSY_STAT | DRQ_STAT))) {
+        ad->port_regs.cmd_issue &= ~(1 << slot);
+    }
+}
+
+/* Non-NCQ command is done - This function is never called for NCQ commands. */
 static void ahci_cmd_done(const IDEDMA *dma)
 {
     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
+    IDEState *ide_state = &ad->port.ifs[0];
 
     trace_ahci_cmd_done(ad->hba, ad->port_no);
 
     /* no longer busy */
     if (ad->busy_slot != -1) {
-        ad->port_regs.cmd_issue &= ~(1 << ad->busy_slot);
+        ahci_clear_cmd_issue(ad, ad->busy_slot);
         ad->busy_slot = -1;
     }
 
-    /* update d2h status */
-    ahci_write_fis_d2h(ad);
+    /*
+     * In reality, for non-NCQ commands, PxCI is cleared after receiving a D2H
+     * FIS with the interrupt bit set, but since ahci_write_fis_d2h() will raise
+     * an IRQ, we need to call them in reverse order.
+     */
+    ahci_write_fis_d2h(ad, true);
 
-    if (ad->port_regs.cmd_issue && !ad->check_bh) {
+    if (!(ide_state->status & ERR_STAT) &&
+        ad->port_regs.cmd_issue && !ad->check_bh) {
         ad->check_bh = qemu_bh_new_guarded(ahci_check_cmd_bh, ad,
                                            &ad->mem_reentrancy_guard);
         qemu_bh_schedule(ad->check_bh);
diff --git a/hw/ide/core.c b/hw/ide/core.c
index ee116891ed..b5e0dcd29b 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -533,9 +533,9 @@ BlockAIOCB *ide_issue_trim(
 
 void ide_abort_command(IDEState *s)
 {
-    ide_transfer_stop(s);
     s->status = READY_STAT | ERR_STAT;
     s->error = ABRT_ERR;
+    ide_transfer_stop(s);
 }
 
 static void ide_set_retry(IDEState *s)
diff --git a/tests/qtest/libqos/ahci.c b/tests/qtest/libqos/ahci.c
index f53f12aa99..a2c94c6e06 100644
--- a/tests/qtest/libqos/ahci.c
+++ b/tests/qtest/libqos/ahci.c
@@ -404,57 +404,110 @@ void ahci_port_clear(AHCIQState *ahci, uint8_t port)
 /**
  * Check a port for errors.
  */
-void ahci_port_check_error(AHCIQState *ahci, uint8_t port,
-                           uint32_t imask, uint8_t emask)
+void ahci_port_check_error(AHCIQState *ahci, AHCICommand *cmd)
 {
+    uint8_t port = cmd->port;
     uint32_t reg;
 
-    /* The upper 9 bits of the IS register all indicate errors. */
-    reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
-    reg &= ~imask;
-    reg >>= 23;
-    g_assert_cmphex(reg, ==, 0);
+    /* If expecting TF error, ensure that TFES is set. */
+    if (cmd->errors) {
+        reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
+        ASSERT_BIT_SET(reg, AHCI_PX_IS_TFES);
+    } else {
+        /* The upper 9 bits of the IS register all indicate errors. */
+        reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
+        reg &= ~cmd->interrupts;
+        reg >>= 23;
+        g_assert_cmphex(reg, ==, 0);
+    }
 
-    /* The Sata Error Register should be empty. */
+    /* The Sata Error Register should be empty, even when expecting TF error. */
     reg = ahci_px_rreg(ahci, port, AHCI_PX_SERR);
     g_assert_cmphex(reg, ==, 0);
 
+    /* If expecting TF error, and TFES was set, perform error recovery
+     * (see AHCI 1.3 section 6.2.2.1) such that we can send new commands. */
+    if (cmd->errors) {
+        /* This will clear PxCI. */
+        ahci_px_clr(ahci, port, AHCI_PX_CMD, AHCI_PX_CMD_ST);
+
+        /* The port has 500ms to disengage. */
+        usleep(500000);
+        reg = ahci_px_rreg(ahci, port, AHCI_PX_CMD);
+        ASSERT_BIT_CLEAR(reg, AHCI_PX_CMD_CR);
+
+        /* Clear PxIS. */
+        reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
+        ahci_px_wreg(ahci, port, AHCI_PX_IS, reg);
+
+        /* Check if we need to perform a COMRESET.
+         * Not implemented right now, as there is no reason why our QEMU model
+         * should need a COMRESET when expecting TF error. */
+        reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
+        ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_BSY | AHCI_PX_TFD_STS_DRQ);
+
+        /* Enable issuing new commands. */
+        ahci_px_set(ahci, port, AHCI_PX_CMD, AHCI_PX_CMD_ST);
+    }
+
     /* The TFD also has two error sections. */
     reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
-    if (!emask) {
+    if (!cmd->errors) {
         ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_ERR);
     } else {
         ASSERT_BIT_SET(reg, AHCI_PX_TFD_STS_ERR);
     }
-    ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_ERR & (~emask << 8));
-    ASSERT_BIT_SET(reg, AHCI_PX_TFD_ERR & (emask << 8));
+    ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_ERR & (~cmd->errors << 8));
+    ASSERT_BIT_SET(reg, AHCI_PX_TFD_ERR & (cmd->errors << 8));
 }
 
-void ahci_port_check_interrupts(AHCIQState *ahci, uint8_t port,
-                                uint32_t intr_mask)
+void ahci_port_check_interrupts(AHCIQState *ahci, AHCICommand *cmd)
 {
+    uint8_t port = cmd->port;
     uint32_t reg;
 
+    /* If we expect errors, error handling in ahci_port_check_error() will
+     * already have cleared PxIS, so in that case this function cannot verify
+     * and clear expected interrupts. */
+    if (cmd->errors) {
+        return;
+    }
+
     /* Check for expected interrupts */
     reg = ahci_px_rreg(ahci, port, AHCI_PX_IS);
-    ASSERT_BIT_SET(reg, intr_mask);
+    ASSERT_BIT_SET(reg, cmd->interrupts);
 
     /* Clear expected interrupts and assert all interrupts now cleared. */
-    ahci_px_wreg(ahci, port, AHCI_PX_IS, intr_mask);
+    ahci_px_wreg(ahci, port, AHCI_PX_IS, cmd->interrupts);
     g_assert_cmphex(ahci_px_rreg(ahci, port, AHCI_PX_IS), ==, 0);
 }
 
-void ahci_port_check_nonbusy(AHCIQState *ahci, uint8_t port, uint8_t slot)
+void ahci_port_check_nonbusy(AHCIQState *ahci, AHCICommand *cmd)
 {
+    uint8_t slot = cmd->slot;
+    uint8_t port = cmd->port;
     uint32_t reg;
 
-    /* Assert that the command slot is no longer busy (NCQ) */
+    /* For NCQ command with error PxSACT bit should still be set.
+     * For NCQ command without error, PxSACT bit should be cleared.
+     * For non-NCQ command, PxSACT bit should always be cleared. */
     reg = ahci_px_rreg(ahci, port, AHCI_PX_SACT);
-    ASSERT_BIT_CLEAR(reg, (1 << slot));
+    if (cmd->props->ncq && cmd->errors) {
+        ASSERT_BIT_SET(reg, (1 << slot));
+    } else {
+        ASSERT_BIT_CLEAR(reg, (1 << slot));
+    }
 
-    /* Non-NCQ */
+    /* For non-NCQ command with error, PxCI bit should still be set.
+     * For non-NCQ command without error, PxCI bit should be cleared.
+     * For NCQ command without error, PxCI bit should be cleared.
+     * For NCQ command with error, PxCI bit may or may not be cleared. */
     reg = ahci_px_rreg(ahci, port, AHCI_PX_CI);
-    ASSERT_BIT_CLEAR(reg, (1 << slot));
+    if (!cmd->props->ncq && cmd->errors) {
+        ASSERT_BIT_SET(reg, (1 << slot));
+    } else if (!cmd->errors) {
+        ASSERT_BIT_CLEAR(reg, (1 << slot));
+    }
 
     /* And assert that we are generally not busy. */
     reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
@@ -1207,9 +1260,10 @@ void ahci_command_wait(AHCIQState *ahci, AHCICommand *cmd)
 
 #define RSET(REG, MASK) (BITSET(ahci_px_rreg(ahci, cmd->port, (REG)), (MASK)))
 
-    while (RSET(AHCI_PX_TFD, AHCI_PX_TFD_STS_BSY) ||
-           RSET(AHCI_PX_CI, 1 << cmd->slot) ||
-           (cmd->props->ncq && RSET(AHCI_PX_SACT, 1 << cmd->slot))) {
+    while (!RSET(AHCI_PX_TFD, AHCI_PX_TFD_STS_ERR) &&
+           (RSET(AHCI_PX_TFD, AHCI_PX_TFD_STS_BSY) ||
+            RSET(AHCI_PX_CI, 1 << cmd->slot) ||
+            (cmd->props->ncq && RSET(AHCI_PX_SACT, 1 << cmd->slot)))) {
         usleep(50);
     }
 
@@ -1226,9 +1280,9 @@ void ahci_command_verify(AHCIQState *ahci, AHCICommand *cmd)
     uint8_t slot = cmd->slot;
     uint8_t port = cmd->port;
 
-    ahci_port_check_error(ahci, port, cmd->interrupts, cmd->errors);
-    ahci_port_check_interrupts(ahci, port, cmd->interrupts);
-    ahci_port_check_nonbusy(ahci, port, slot);
+    ahci_port_check_nonbusy(ahci, cmd);
+    ahci_port_check_error(ahci, cmd);
+    ahci_port_check_interrupts(ahci, cmd);
     ahci_port_check_cmd_sanity(ahci, cmd);
     if (cmd->interrupts & AHCI_PX_IS_DHRS) {
         ahci_port_check_d2h_sanity(ahci, port, slot);
diff --git a/tests/qtest/libqos/ahci.h b/tests/qtest/libqos/ahci.h
index 88835b6228..48017864bf 100644
--- a/tests/qtest/libqos/ahci.h
+++ b/tests/qtest/libqos/ahci.h
@@ -590,11 +590,9 @@ void ahci_set_command_header(AHCIQState *ahci, uint8_t port,
 void ahci_destroy_command(AHCIQState *ahci, uint8_t port, uint8_t slot);
 
 /* AHCI sanity check routines */
-void ahci_port_check_error(AHCIQState *ahci, uint8_t port,
-                           uint32_t imask, uint8_t emask);
-void ahci_port_check_interrupts(AHCIQState *ahci, uint8_t port,
-                                uint32_t intr_mask);
-void ahci_port_check_nonbusy(AHCIQState *ahci, uint8_t port, uint8_t slot);
+void ahci_port_check_error(AHCIQState *ahci, AHCICommand *cmd);
+void ahci_port_check_interrupts(AHCIQState *ahci, AHCICommand *cmd);
+void ahci_port_check_nonbusy(AHCIQState *ahci, AHCICommand *cmd);
 void ahci_port_check_d2h_sanity(AHCIQState *ahci, uint8_t port, uint8_t slot);
 void ahci_port_check_pio_sanity(AHCIQState *ahci, AHCICommand *cmd);
 void ahci_port_check_cmd_sanity(AHCIQState *ahci, AHCICommand *cmd);