linux-dev/drivers/net/ipa/ipa_interrupt.c, branch linus/master

net: ipa: don't proceed to out-of-bound write

2022-05-20T01:44:51Z

GCC 12 seems upset that we check ipa_irq against array bound but then proceed, anyway: drivers/net/ipa/ipa_interrupt.c: In function ‘ipa_interrupt_add’: drivers/net/ipa/ipa_interrupt.c:196:27: warning: array subscript 30 is above array bounds of ‘void (*[30])(struct ipa *, enum ipa_irq_id)’ [-Warray-bounds] 196 | interrupt->handler[ipa_irq] = handler; | ~~~~~~~~~~~~~~~~~~^~~~~~~~~ drivers/net/ipa/ipa_interrupt.c:42:27: note: while referencing ‘handler’ 42 | ipa_irq_handler_t handler[IPA_IRQ_COUNT]; | ^~~~~~~ Reviewed-by: Alex Elder Link: https://lore.kernel.org/r/20220519004417.2109886-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

net: ipa: use autosuspend

2021-08-22T08:44:17Z

Use runtime power management autosuspend. Up until this point, we only suspended the IPA hardware for system suspend; now we'll suspend it aggressively using runtime power management, setting the initial autosuspend delay to half a second of inactivity. Replace pm_runtime_put() calls with pm_runtime_put_autosuspend(), call pm_runtime_mark_last_busy() before each of those. In places where we're shutting things down, or decrementing power references for errors, use pm_runtime_put_noidle() instead. Finally, remove ipa_runtime_idle(), so the ->runtime_suspend callback will occur if idle. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: kill ipa_clock_get()

2021-08-20T13:45:47Z

The only remaining user of the ipa_clock_{get,put}() interface is ipa_isr_thread(). Replace calls to ipa_clock_get() there calling pm_runtime_get_sync() instead. And call pm_runtime_put() there rather than ipa_clock_put(). Warn if we ever get an error. With that, we can get rid of ipa_clock_get() and ipa_clock_put(). Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: have ipa_clock_get() return a value

2021-08-11T12:31:55Z

We currently assume no errors occur when enabling or disabling the IPA core clock and interconnects. And although this commit exposes errors that could occur, we generally assume this won't happen in practice. This commit changes ipa_clock_get() and ipa_clock_put() so each returns a value. The values returned are meant to mimic what the runtime power management functions return, so we can set up error handling here before we make the switch. Have ipa_clock_get() increment the reference count even if it returns an error, to match the behavior of pm_runtime_get(). More details follow. When taking a reference in ipa_clock_get(), return 0 for the first reference, 1 for subsequent references, or a negative error code if an error occurs. Note that if ipa_clock_get() returns an error, we must not touch hardware; in some cases such errors now cause entire blocks of code to be skipped. When dropping a reference in ipa_clock_put(), we return 0 or an error code. The error would come from ipa_clock_disable(), which now returns what ipa_interconnect_disable() returns (either 0 or a negative error code). For now, callers ignore the return value; if an error occurs, a message will have already been logged, and little more can actually be done to improve the situation. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: kill ipa_interrupt_process_all()

2021-07-27T20:02:06Z

Now that ipa_isr_thread() is a simple wrapper that gets a clock reference around ipa_interrupt_process_all(), get rid of the called function and just open-code it in ipa_isr_thread(). Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: get rid of some unneeded IPA interrupt code

2021-07-27T20:02:06Z

The pending IPA interrupts are checked by ipa_isr_thread(), and interrupts are processed only if an enabled interrupt has a condition pending. But ipa_interrupt_process_all() now makes the same check, so the one in ipa_isr_thread() can just be skipped. Also in ipa_isr_thread(), any interrupt conditions pending which are not enabled are cleared. Here too, ipa_interrupt_process_all() now clears such excess interrupt conditions, so ipa_isr_thread() doesn't have to. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: clear disabled IPA interrupt conditions

2021-07-27T20:02:06Z

We ignore any IPA interrupt that has no handler. If any interrupt conditions without a handler exist when an IPA interrupt occurs, clear those conditions. Add a debug message to report which ones are being cleared. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: make IPA interrupt handler threaded only

2021-07-27T20:02:06Z

When the IPA interrupt handler runs, the IPA core clock must already be operational, and the interconnect providing access by the AP to IPA config space must be enabled too. Currently we ensure this by taking a top-level "stay awake" IPA clock reference, but that will soon go away. In preparation for that, move all handling for the IPA IRQ into the thread function. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: set up IPA interrupts earlier

2021-07-26T22:09:18Z

Initialization of the IPA driver has several phases: - "init" phase can be done without any access to IPA hardware - "config" phase requires the IPA hardware to be clocked - "setup" phase requires the GSI layer to be functional Currently, initialization for the IPA interrupt handling code occurs in the setup phase. It requires access to the IPA hardware but does not need GSI, so it can be moved to the config phase instead. Call the interrupt configuration function early in ipa_config() rather than from ipa_setup(). Rename ipa_interrupt_setup() to be ipa_interrupt_config(), and ipa_interrupt_teardown() to be ipa_interupt_deconfig(), so their names properly indicate when they get called. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: use WARN_ON() rather than assertions

2021-07-26T21:38:11Z

I've added commented assertions to record certain properties that can be assumed to hold in certain places in the IPA code. Convert these into real WARN_ON() calls so the assertions are actually checked, using the standard WARN_ON() mechanism. Where errors can be returned, return an error if a warning is triggered. Signed-off-by: Alex Elder Signed-off-by: David S. Miller