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ioat(4): pci_save/restore_state to persist MSI-X registers over BDXDE reset

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Also for BWD devices, per jimharris@.

Reviewed by:	jhb
Approved by:	markj (mentor)
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D3552
This commit is contained in:
cem 2015-09-02 22:48:41 +00:00
parent 81fc8f528c
commit a30daa64f0
1 changed files with 18 additions and 16 deletions
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34
sys/dev/ioat/ioat.c
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@ -60,7 +60,7 @@ static int ioat_map_pci_bar(struct ioat_softc *ioat);
static void ioat_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg,
int error);
static void ioat_interrupt_handler(void *arg);
static boolean_t ioat_is_bdxde(struct ioat_softc *ioat);
static boolean_t ioat_model_resets_msix(struct ioat_softc *ioat);
static void ioat_process_events(struct ioat_softc *ioat);
static inline uint32_t ioat_get_active(struct ioat_softc *ioat);
static inline uint32_t ioat_get_ring_space(struct ioat_softc *ioat);
@ -511,12 +511,18 @@ ioat_setup_intr(struct ioat_softc *ioat)
}
static boolean_t
ioat_is_bdxde(struct ioat_softc *ioat)
ioat_model_resets_msix(struct ioat_softc *ioat)
{
u_int32_t pciid;
pciid = pci_get_devid(ioat->device);
switch (pciid) {
/* BWD: */
case 0x0c508086:
case 0x0c518086:
case 0x0c528086:
case 0x0c538086:
/* BDXDE: */
case 0x6f508086:
case 0x6f518086:
case 0x6f528086:
@ -947,7 +953,7 @@ ioat_reset_hw(struct ioat_softc *ioat)
{
uint64_t status;
uint32_t chanerr;
int timeout, error;
int timeout;
status = ioat_get_chansts(ioat);
if (is_ioat_active(status) || is_ioat_idle(status))
@ -974,6 +980,13 @@ ioat_reset_hw(struct ioat_softc *ioat)
chanerr = pci_read_config(ioat->device, IOAT_CFG_CHANERR_INT_OFFSET, 4);
pci_write_config(ioat->device, IOAT_CFG_CHANERR_INT_OFFSET, chanerr, 4);
/*
* BDXDE and BWD models reset MSI-X registers on device reset.
* Save/restore their contents manually.
*/
if (ioat_model_resets_msix(ioat))
pci_save_state(ioat->device);
ioat_reset(ioat);
/* Wait at most 20 ms */
@ -982,19 +995,8 @@ ioat_reset_hw(struct ioat_softc *ioat)
if (timeout == 20)
return (ETIMEDOUT);
/*
* BDXDE models reset MSI-X registers on device reset. We must
* teardown and re-setup interrupts.
*/
if (ioat_is_bdxde(ioat)) {
error = ioat_teardown_intr(ioat);
if (error)
return (error);
error = ioat_setup_intr(ioat);
if (error)
return (error);
}
if (ioat_model_resets_msix(ioat))
pci_restore_state(ioat->device);
return (0);
}