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Star64_linux/drivers/ata
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Alexander Gordeev ab0f9e78b9 ahci: Ensure "MSI Revert to Single Message" mode is not enforced 
The AHCI specification allows hardware to choose to revert to
single MSI mode when fewer messages are allocated than requested.
Yet, at least ICH10 chipset reverts to single MSI mode even when
enough messages are allocated in some cases (see below).

This update forces the driver to not rely on initialization of
multiple MSIs mode alone and always check if "MSI Revert to
Single Message" (MRSM) mode was enforced by the controller and
fallback to the single MSI mode in case it did.

That prevents a situation when the driver configured multiple
per-port IRQ handlers, but the controller sends all port's
interrupts to a single IRQ, which could easily screw up the
interrupt handling and lead to delays and possibly crashes.

The fix was tested on a 6-port controller that successfully
reverted to the single MSI mode:

00:1f.2 SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA
AHCI Controller (prog-if 01 [AHCI 1.0])
	Subsystem: Super Micro Computer Inc Device 10a7
	Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 101
	I/O ports at f110 [size=8]
	I/O ports at f100 [size=4]
	I/O ports at f0f0 [size=8]
	I/O ports at f0e0 [size=4]
	I/O ports at f020 [size=32]
	Memory at fbf00000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: [80] MSI: Enable+ Count=1/16 Maskable- 64bit-
	Capabilities: [70] Power Management version 3
	Capabilities: [a8] SATA HBA v1.0
	Capabilities: [b0] PCI Advanced Features
	Kernel driver in use: ahci

With 6 ports just 8 MSI vectors should be enough, but the adapter
enforces the MRSM mode when less than 16 vectors are written to
the Multiple Messages Enable PCI register. I instigated MRSM mode
by forcing @nvec to 8 in ahci_init_interrupts().

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: linux-ide@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-04-17 09:58:48 -04:00
..
acard-ahci.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
ahci.c ahci: Ensure "MSI Revert to Single Message" mode is not enforced 2014-04-17 09:58:48 -04:00
ahci.h ahci: Ensure "MSI Revert to Single Message" mode is not enforced 2014-04-17 09:58:48 -04:00
ahci_da850.c ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller 2014-03-25 15:17:13 -04:00
ahci_imx.c ahci_imx: Put #ifdef CONFIG_PM_SLEEP around suspend / resume functions 2014-03-06 14:31:13 -05:00
ahci_platform.c ata: move library code from ahci_platform.c to libahci_platform.c 2014-03-25 15:17:13 -04:00
ahci_st.c ata: ahci_st: remove deprecated struct ahci_platform_data usage 2014-03-14 14:26:29 -04:00
ahci_sunxi.c ata: ahci_sunxi: fix code formatting 2014-03-17 10:46:54 -04:00
ahci_xgene.c ata: Fix compiler warning with APM X-Gene host controller driver 2014-03-18 16:01:04 -04:00
ata_generic.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
ata_piix.c ata_piix: minor typo and a printk fix 2013-10-13 16:17:48 -04:00
Kconfig ata: fix i.MX AHCI driver dependencies 2014-04-08 08:31:48 -04:00
libahci.c ata: remove superfluous casts 2014-03-26 12:36:53 -04:00
libahci_platform.c ata: move library code from ahci_platform.c to libahci_platform.c 2014-03-25 15:17:13 -04:00
libata-acpi.c ACPI and power management updates for 3.15-rc1 2014-04-01 12:48:54 -07:00
libata-core.c libata: Update queued trim blacklist for M5x0 drives 2014-04-02 13:10:21 -04:00
libata-eh.c libata, libsas: kill pm_result and related cleanup 2014-03-18 16:08:38 -04:00
libata-pmp.c ata: enable quirk from jmicron JMB350 for JMB394 2014-01-31 07:05:44 -05:00
libata-scsi.c Merge branch 'for-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-01-21 18:16:08 -08:00
libata-sff.c libata: update "Maintained by:" tags 2013-05-14 11:13:04 -07:00
libata-transport.c libata: Fix display of sata speed 2013-10-27 07:43:25 -04:00
libata-transport.h
libata-zpodd.c libata: zpodd: eliminate odd_can_poweroff 2014-03-14 11:23:47 -04:00
libata.h ATA / ACPI: remove power dependent device handling 2013-10-17 15:38:53 +02:00
Makefile ata: add new-style AHCI platform driver for DaVinci DA850 AHCI controller 2014-03-25 15:17:13 -04:00
pata_acpi.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_ali.c ata: use pci_get_drvdata() 2013-06-02 22:22:03 -07:00
pata_amd.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_arasan_cf.c pata_arasan_cf: fix ata_host_activate() failure handling 2014-04-14 13:50:03 -04:00
pata_artop.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_at32.c ata: use dev_get_platdata() 2013-07-30 08:59:24 -04:00
pata_at91.c pata_at91: fix ata_host_activate() failure handling 2014-04-02 13:17:31 -04:00
pata_atiixp.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_atp867x.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_bf54x.c ata: use platform_{get,set}_drvdata() 2013-05-24 10:26:13 +09:00
pata_cmd64x.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_cmd640.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_cs5520.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_cs5530.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_cs5535.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_cs5536.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_cypress.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_efar.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_ep93xx.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_hpt3x2n.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_hpt3x3.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_hpt37x.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_hpt366.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_icside.c Drivers: ata: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
pata_imx.c Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-03-31 15:27:37 -07:00
pata_isapnp.c pata_isapnp: Don't use invalid I/O ports 2013-10-07 15:17:32 -04:00
pata_it821x.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_it8213.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_ixp4xx_cf.c DMA-API: others: use dma_set_coherent_mask() 2013-10-31 14:49:07 +00:00
pata_jmicron.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_legacy.c pata_legacy: Remove dead code 2014-03-11 08:30:53 -04:00
pata_macio.c ata: use pci_get_drvdata() 2013-06-02 22:22:03 -07:00
pata_marvell.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_mpc52xx.c ata: use platform_{get,set}_drvdata() 2013-05-24 10:26:13 +09:00
pata_mpiix.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_netcell.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_ninja32.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_ns87410.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_ns87415.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_octeon_cf.c DMA-API: ata: pata_octeon_cf: convert to use dma_coerce_mask_and_coherent() 2013-10-31 14:48:49 +00:00
pata_of_platform.c Drivers: ata: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
pata_oldpiix.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_opti.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_optidma.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_palmld.c Drivers: ata: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
pata_pcmcia.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_pdc202xx_old.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_pdc2027x.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_piccolo.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_platform.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_pxa.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_radisys.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_rb532_cf.c Drivers: ata: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
pata_rdc.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_rz1000.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_samsung_cf.c pata_samsung_cf: fix ata_host_activate() failure handling 2014-04-15 08:48:56 -04:00
pata_sc1200.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_scc.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_sch.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_serverworks.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_sil680.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_sis.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_sl82c105.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_triflex.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_via.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pdc_adma.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_dwc_460ex.c ata: remove superfluous casts 2014-03-26 12:36:53 -04:00
sata_fsl.c drivers: clean-up prom.h implicit includes 2013-10-09 20:04:04 -05:00
sata_highbank.c ata: sata_highbank: remove superfluous cast 2014-03-26 11:42:01 -04:00
sata_inic162x.c libata: make it clear that sata_inic162x is experimental 2013-07-22 17:11:14 -04:00
sata_mv.c Merge branch 'for-3.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-02-20 12:04:15 -08:00
sata_nv.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_promise.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_promise.h
sata_qstor.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_rcar.c sata_rcar: Add R-Car Gen2 SATA PHY support 2013-11-29 15:41:17 -05:00
sata_sil.c Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2014-03-31 15:27:37 -07:00
sata_sil24.c ata: use pci_get_drvdata() 2013-06-02 22:22:03 -07:00
sata_sis.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_svw.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_sx4.c ata: remove superfluous casts 2014-03-26 12:36:53 -04:00
sata_uli.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_via.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_vsc.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sis.h