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mmc: core: Introduce host claiming by context

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Currently the host can be claimed by a task.  Change this so that the host
can be claimed by a context that may or may not be a task.  This provides
for the host to be claimed by a block driver queue to support blk-mq, while
maintaining compatibility with the existing use of mmc_claim_host().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2017-09-22 15:36:51 +03:00 • committed by Ulf Hansson
parent 9ca28c5cd9
commit 6c0cedd1ef
7 changed files with 60 additions and 19 deletions
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7
include/linux/mmc/host.h
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@ -255,6 +255,10 @@ struct mmc_supply {
struct regulator *vqmmc; /* Optional Vccq supply */
};
struct mmc_ctx {
struct task_struct *task;
};
struct mmc_host {
struct device *parent;
struct device class_dev;
@ -388,8 +392,9 @@ struct mmc_host {
struct mmc_card *card; /* device attached to this host */
wait_queue_head_t wq;
struct task_struct *claimer; /* task that has host claimed */
struct mmc_ctx *claimer; /* context that has host claimed */
int claim_cnt; /* "claim" nesting count */
struct mmc_ctx default_ctx; /* default context */
struct delayed_work detect;
int detect_change; /* card detect flag */