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Sam Ravnborg ea1fe916ac drm/drm_fb_helper: fix fbdev with sparc64 
[ Upstream commit 2a1658bf922ffd9b7907e270a7d9cdc9643fc45d ]

Recent kernels have been reported to panic using the bochs_drm
framebuffer under qemu-system-sparc64 which was bisected to
commit 7a0483ac4ffc ("drm/bochs: switch to generic drm fbdev emulation").

The backtrace indicates that the shadow framebuffer copy in
drm_fb_helper_dirty_blit_real() is trying to access the real
framebuffer using a virtual address rather than use an IO access
typically implemented using a physical (ASI_PHYS) access on SPARC.

The fix is to replace the memcpy with memcpy_toio() from io.h.

memcpy_toio() uses writeb() where the original fbdev code
used sbus_memcpy_toio(). The latter uses sbus_writeb().

The difference between writeb() and sbus_memcpy_toio() is
that writeb() writes bytes in little-endian, where sbus_writeb() writes
bytes in big-endian. As endian does not matter for byte writes they are
the same. So we can safely use memcpy_toio() here.

Note that this only fixes bochs, in general fbdev helpers still have
issues with mixing up system memory and __iomem space. Fixing that will
require a lot more work.

v3:
  - Improved changelog (Daniel)
  - Added FIXME to fbdev_use_iomem (Daniel)

v2:
  - Added missing __iomem cast (kernel test robot)
  - Made changelog readable and fix typos (Mark)
  - Add flag to select iomem - and set it in the bochs driver

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reported-by: kernel test robot <lkp@intel.com>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20200709193016.291267-1-sam@ravnborg.org
Link: https://patchwork.freedesktop.org/patch/msgid/20200725191012.GA434957@ravnborg.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-03-16 16:33:06 +08:00
..
accessibility Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
acpi ACPI: video: Use native backlight on Acer TravelMate 5735Z 2021-03-16 16:31:56 +08:00
amba Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
android binder: Prevent context manager from incrementing ref 0 2021-03-16 16:33:03 +08:00
ata ata/libata: Fix usage of page address by page_address in ata_scsi_mode_select_xlat function 2021-03-16 16:31:03 +08:00
atm Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
auxdisplay Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
base PM: wakeup: Show statistics for deleted wakeup sources again 2021-03-16 16:32:43 +08:00
bcma Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
block Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()" 2021-03-16 16:32:11 +08:00
bluetooth Bluetooth: hci_bcm: fix freeing not-requested IRQ 2021-03-16 16:29:45 +08:00
bus bus: ti-sysc: Do not disable on suspend for no-idle 2021-03-16 16:31:58 +08:00
cdrom Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
char random32: update the net random state on interrupt and activity 2021-03-16 16:32:58 +08:00
clk clk: qcom: gcc: Add missing UFS clocks for SM8150 2021-03-16 16:32:05 +08:00
clocksource arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040 2021-03-16 16:31:46 +08:00
connector Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
counter counter: 104-quad-8: Add lock guards - generic interface 2021-03-16 16:27:07 +08:00
cpufreq cpufreq: Fix up cpufreq_boost_set_sw() 2021-03-16 16:29:08 +08:00
cpuidle cpuidle: Fix three reference count leaks 2021-03-16 16:29:37 +08:00
crypto crypto: ccp - Release all allocated memory if sha type is invalid 2021-03-16 16:32:43 +08:00
dax device-dax: don't leak kernel memory to user space after unloading kmem 2021-03-16 16:28:19 +08:00
dca Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
devfreq PM / devfreq: Add missing locking while setting suspend_freq 2021-03-16 16:27:31 +08:00
dio Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
dma dmaengine: ioat setting ioat timeout as module parameter 2021-03-16 16:32:31 +08:00
dma-buf dmabuf: use spinlock to access dmabuf->name 2021-03-16 16:32:21 +08:00
edac EDAC/amd64: Read back the scrub rate PCI register on F15h 2021-03-16 16:31:13 +08:00
eisa Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
extcon extcon: adc-jack: Fix an error handling path in 'adc_jack_probe()' 2021-03-16 16:30:26 +08:00
firewire Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
firmware drivers/firmware/psci: Fix memory leakage in alloc_init_cpu_groups() 2021-03-16 16:32:20 +08:00
fpga fpga: dfl: fix bug in port reset handshake 2021-03-16 16:32:23 +08:00
fsi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
gnss gnss: sirf: fix error return code in sirf_probe() 2021-03-16 16:29:47 +08:00
gpio gpio: arizona: put pm_runtime in case of failure 2021-03-16 16:32:18 +08:00
gpu drm/drm_fb_helper: fix fbdev with sparc64 2021-03-16 16:33:06 +08:00
greybus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hid HID: apple: Disable Fn-key key-re-mapping on clone keyboards 2021-03-16 16:32:29 +08:00
hsi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hv Drivers: hv: vmbus: Always handle the VMBus messages on CPU0 2021-03-16 16:29:25 +08:00
hwmon hwmon: (scmi) Fix potential buffer overflow in scmi_hwmon_probe() 2021-03-16 16:32:33 +08:00
hwspinlock Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hwtracing intel_th: Fix a NULL dereference when hub driver is not loaded 2021-03-16 16:32:13 +08:00
i2c Revert "i2c: cadence: Fix the hold bit setting" 2021-03-16 16:32:56 +08:00
i3c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ide Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
idle Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
iio iio: adc: ad7780: Fix a resource handling path in 'ad7780_probe()' 2021-03-16 16:31:58 +08:00
infiniband IB/rdmavt: Fix RQ counting issues causing use of an invalid RWQE 2021-03-16 16:32:45 +08:00
input Input: elan_i2c - only increment wakeup count on touch 2021-03-16 16:32:31 +08:00
interconnect Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
iommu irqdomain/treewide: Keep firmware node unconditionally allocated 2021-03-16 16:32:20 +08:00
ipack ipack: tpci200: fix error return code in tpci200_register() 2021-03-16 16:28:19 +08:00
irqchip irqchip/gic: Atomically update affinity 2021-03-16 16:31:22 +08:00
isdn Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
leds leds: 88pm860x: fix use-after-free on unbind 2021-03-16 16:33:05 +08:00
lightnvm Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
macintosh drivers/macintosh: Fix memleak in windfarm_pm112 driver 2021-03-16 16:29:49 +08:00
mailbox mailbox: zynqmp-ipi: Fix NULL vs IS_ERR() check in zynqmp_ipi_mbox_probe() 2021-03-16 16:30:27 +08:00
mcb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
md dm integrity: fix integrity recalculation that is improperly skipped 2021-03-16 16:32:40 +08:00
media media: rc: prevent memory leak in cx23888_ir_probe 2021-03-16 16:32:44 +08:00
memory Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
memstick Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
message scsi: mptscsih: Fix read sense data size 2021-03-16 16:31:28 +08:00
mfd mfd: stmfx: Disable IRQ in suspend to avoid spurious interrupt 2021-03-16 16:30:24 +08:00
misc misc: atmel-ssc: lock with mutex instead of spinlock 2021-03-16 16:32:14 +08:00
mmc mmc: sdhci-of-aspeed: Fix clock divider calculation 2021-03-16 16:32:38 +08:00
mtd mtd: properly check all write ioctls for permissions 2021-03-16 16:33:04 +08:00
mux Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
net drivers/net/wan: lapb: Corrected the usage of skb_cow 2021-03-16 16:32:57 +08:00
nfc nfc: s3fwrn5: add missing release on skb in s3fwrn5_recv_frame 2021-03-16 16:32:55 +08:00
ntb NTB: perf: Fix race condition when run with ntb_test 2021-03-16 16:30:32 +08:00
nubus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
nvdimm libnvdimm: Out of bounds read in __nd_ioctl() 2021-03-16 16:26:40 +08:00
nvme nvme-pci: prevent SK hynix PC400 from using Write Zeroes command 2021-03-16 16:33:05 +08:00
nvmem nvmem: qfprom: remove incorrect write support 2021-03-16 16:28:52 +08:00
of of: of_mdio: Correct loop scanning logic 2021-03-16 16:31:51 +08:00
opp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
oprofile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
parisc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
parport Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pci PCI/ASPM: Disable ASPM on ASMedia ASM1083/1085 PCIe-to-PCI bridge 2021-03-16 16:32:44 +08:00
pcmcia Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
perf drivers/perf: Prevent forced unbinding of PMU drivers 2021-03-16 16:32:34 +08:00
phy phy: sun4i-usb: fix dereference of pointer phy0 before it is null checked 2021-03-16 16:31:57 +08:00
pinctrl pinctrl: amd: fix npins for uart0 in kerncz_groups 2021-03-16 16:32:18 +08:00
platform platform/x86: asus-wmi: allow BAT1 battery name 2021-03-16 16:32:33 +08:00
pnp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
power power: supply: smb347-charger: IRQSTAT_D is volatile 2021-03-16 16:30:14 +08:00
powercap Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pps Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ps3 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ptp Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
pwm pwm: jz4740: Fix build failure 2021-03-16 16:31:41 +08:00
rapidio rapidio: fix an error in get_user_pages_fast() error handling 2021-03-16 16:28:19 +08:00
ras Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
regulator regualtor: pfuze100: correct sw1a/sw2 on pfuze3000 2021-03-16 16:30:56 +08:00
remoteproc remoteproc: qcom_q6v5_mss: map/unmap mpss segments before/after use 2021-03-16 16:29:59 +08:00
reset Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rpmsg Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
rtc rtc: rv3028: Add missed check for devm_regmap_init_i2c() 2021-03-16 16:30:27 +08:00
s390 s390/qeth: fix error handling for isolation mode cmds 2021-03-16 16:30:59 +08:00
sbus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
scsi scsi: core: Run queue in case of I/O resource contention failure 2021-03-16 16:32:55 +08:00
sfi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sh Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
siox Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
slimbus slimbus: core: Fix mismatch in of_node_get/put 2021-03-16 16:32:05 +08:00
soc soc: qcom: rpmh: Dirt can only make you dirtier, not cleaner 2021-03-16 16:32:18 +08:00
soundwire soundwire: intel: fix memory leak with devm_kasprintf 2021-03-16 16:31:57 +08:00
spi spi: mediatek: use correct SPI_CFG2_REG MACRO 2021-03-16 16:32:30 +08:00
spmi Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ssb Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
staging Staging: rtl8188eu: rtw_mlme: Fix uninitialized variable authmode 2021-03-16 16:33:02 +08:00
target scsi: target: tcmu: Fix a use after free in tcmu_check_expired_queue_cmd() 2021-03-16 16:30:24 +08:00
tc Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tee Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
thermal thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power 2021-03-16 16:32:15 +08:00
thunderbolt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tty vt: Reject zero-sized screen buffer size. 2021-03-16 16:32:37 +08:00
uio uio_pdrv_genirq: fix use without device tree and no interrupt 2021-03-16 16:32:12 +08:00
usb usb: xhci: Fix ASMedia ASM1142 DMA addressing 2021-03-16 16:33:00 +08:00
vfio vfio/mdev: Fix reference count leak in add_mdev_supported_type 2021-03-16 16:30:27 +08:00
vhost vhost/scsi: fix up req type endian-ness 2021-03-16 16:32:46 +08:00
video vgacon: Fix for missing check in scrollback handling 2021-03-16 16:33:04 +08:00
virt virt: vbox: Fix guest capabilities mask check 2021-03-16 16:32:09 +08:00
virtio virtio_balloon: fix up endian-ness for free cmd id 2021-03-16 16:32:47 +08:00
visorbus Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vlynq Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
vme Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
w1 w1: omap-hdq: cleanup to add missing newline for some dev_dbg 2021-03-16 16:29:53 +08:00
watchdog watchdog: da9062: No need to ping manually before setting timeout 2021-03-16 16:30:22 +08:00
xen xen/pvcalls-back: test for errors when calling backend_connect() 2021-03-16 16:29:13 +08:00
zorro Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00