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6ecdcb0f9d
Devices have various maintenance operations need to perform internally. In order to reduce latencies during time critical operations like read and write, it is better to execute maintenance operations in other times - when the host is not being serviced. Such operations are called Background operations (BKOPS). The device notifies the status of the BKOPS need by updating BKOPS_STATUS (EXT_CSD byte [246]). According to the standard a host that supports BKOPS shall check the status periodically and start background operations as needed, so that the device has enough time for its maintenance operations. This patch adds support for this periodic check of the BKOPS status. Since foreground operations are of higher priority than background operations the host will check the need for BKOPS when it is idle, and in case of an incoming request the BKOPS operation will be interrupted. When the mmcqd thread is idle, a delayed work is created to check the need for BKOPS. The time to start the delayed work is calculated based on the host controller suspend timeout, in case it was set. If not, a default time is used. If BKOPS are required in level 1, which is non-blocking, there will be polling of the card status to wait for the BKOPS completion and prevent suspend that will interrupt the BKOPS. If the card raised an exception, the need for urgent BKOPS (level 2/3) will be checked immediately and if needed, the BKOPS will be performed without waiting for the next idle time. (cherry picked from commit 5f360698caa2894f7cc854199ffba285241d152e) Change-Id: I6605ce396188807bed93f437224f2243b178523f Signed-off-by: Maya Erez <merez@codeaurora.org> (cherry picked from commit 833940e728c5903f0263c20e349bbead7a79e535) |
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| acpi | ||
| asm-generic | ||
| crypto | ||
| drm | ||
| keys | ||
| linux | ||
| math-emu | ||
| media | ||
| misc | ||
| mtd | ||
| net | ||
| pcmcia | ||
| rdma | ||
| rxrpc | ||
| scsi | ||
| sound | ||
| target | ||
| trace | ||
| video | ||
| xen | ||
| Kbuild | ||