diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2019-10-03 14:57:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 16:46:48 +0300 |
| commit | ae79af838296f399eb53f555e76e86217695d6da (patch) | |
| tree | 9c953e17f5de01b182761747c9c8f23ca97ceb89 /drivers/nvme | |
| parent | 3dc236296a368bb3c5571207176d8e547589aadf (diff) | |
| download | linux-ae79af838296f399eb53f555e76e86217695d6da.tar.xz | |
nvme: retain split access workaround for capability reads
[ Upstream commit 3a8ecc935efabdad106b5e06d07b150c394b4465 ]
Commit 7fd8930f26be4
"nvme: add a common helper to read Identify Controller data"
has re-introduced an issue that we have attempted to work around in the
past, in commit a310acd7a7ea ("NVMe: use split lo_hi_{read,write}q").
The problem is that some PCIe NVMe controllers do not implement 64-bit
outbound accesses correctly, which is why the commit above switched
to using lo_hi_[read|write]q for all 64-bit BAR accesses occuring in
the code.
In the mean time, the NVMe subsystem has been refactored, and now calls
into the PCIe support layer for NVMe via a .reg_read64() method, which
fails to use lo_hi_readq(), and thus reintroduces the problem that the
workaround above aimed to address.
Given that, at the moment, .reg_read64() is only used to read the
capability register [which is known to tolerate split reads], let's
switch .reg_read64() to lo_hi_readq() as well.
This fixes a boot issue on some ARM boxes with NVMe behind a Synopsys
DesignWare PCIe host controller.
Fixes: 7fd8930f26be4 ("nvme: add a common helper to read Identify Controller data")
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index cd11cced3678..3788c053a0b1 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2274,7 +2274,7 @@ static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) { - *val = readq(to_nvme_dev(ctrl)->bar + off); + *val = lo_hi_readq(to_nvme_dev(ctrl)->bar + off); return 0; } |