irqchip/gic-v3-its: Add post-mortem info on command timeout
If the ITS stops processing commands, we're pretty much toasted as we cannot update the configuration anymore (and we're not even sure that the ITS still translates interrups). If that happens, let's dump some basic information about the state of affairs before moving on. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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@ -690,9 +690,9 @@ static void its_flush_cmd(struct its_node *its, struct its_cmd_block *cmd)
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dsb(ishst);
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}
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static void its_wait_for_range_completion(struct its_node *its,
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struct its_cmd_block *from,
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struct its_cmd_block *to)
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static int its_wait_for_range_completion(struct its_node *its,
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struct its_cmd_block *from,
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struct its_cmd_block *to)
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{
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u64 rd_idx, from_idx, to_idx;
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u32 count = 1000000; /* 1s! */
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@ -713,12 +713,15 @@ static void its_wait_for_range_completion(struct its_node *its,
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count--;
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if (!count) {
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pr_err_ratelimited("ITS queue timeout\n");
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return;
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pr_err_ratelimited("ITS queue timeout (%llu %llu %llu)\n",
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from_idx, to_idx, rd_idx);
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return -1;
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}
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cpu_relax();
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udelay(1);
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}
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return 0;
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}
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/* Warning, macro hell follows */
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@ -754,7 +757,8 @@ post: \
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next_cmd = its_post_commands(its); \
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raw_spin_unlock_irqrestore(&its->lock, flags); \
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\
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its_wait_for_range_completion(its, cmd, next_cmd); \
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if (its_wait_for_range_completion(its, cmd, next_cmd)) \
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pr_err_ratelimited("ITS cmd %ps failed\n", builder); \
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}
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static void its_build_sync_cmd(struct its_cmd_block *sync_cmd,
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