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| author | Haren Myneni <haren@linux.ibm.com> | 2020-04-16 09:03:02 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-04-20 09:53:00 +0300 |
| commit | 9774628acf86409771acad6269ad24ea31ddb4b3 (patch) | |
| tree | 14ea6ba4995fc1a98d177d0f9d79802882445cf6 /arch/powerpc/platforms/powernv/vas.h | |
| parent | db1c08a7406351673c52594f5c8a65829baf5bf6 (diff) | |
| download | linux-9774628acf86409771acad6269ad24ea31ddb4b3.tar.xz | |
powerpc/vas: Setup thread IRQ handler per VAS instance
When NX encounters translation error on CRB and any request buffer,
raises an interrupt on the CPU to handle the fault. It can raise one
interrupt for multiple faults. Expects OS to handle these faults and
return credits for fault window after processing faults.
Setup thread IRQ handler and IRQ thread function per each VAS instance.
IRQ handler checks if the thread is already woken up and can handle new
faults. If so returns with IRQ_HANDLED, otherwise wake up thread to
process new faults.
The thread functions reads each CRB entry from fault FIFO until sees
invalid entry. After reading each CRB, determine the corresponding
send window using pswid (from CRB) and process fault CRB. Then
invalidate the entry and return credit. Processing fault CRB and
return credit is described in subsequent patches.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1587016982.2275.1060.camel@hbabu-laptop
Diffstat (limited to 'arch/powerpc/platforms/powernv/vas.h')
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h index 2a040722dffa..cd165c8b2b57 100644 --- a/arch/powerpc/platforms/powernv/vas.h +++ b/arch/powerpc/platforms/powernv/vas.h @@ -331,7 +331,10 @@ struct vas_instance { u64 irq_port; int virq; + int fault_crbs; int fault_fifo_size; + int fifo_in_progress; /* To wake up thread or return IRQ_HANDLED */ + spinlock_t fault_lock; /* Protects fifo_in_progress update */ void *fault_fifo; struct vas_window *fault_win; /* Fault window */ @@ -431,6 +434,10 @@ extern void vas_instance_init_dbgdir(struct vas_instance *vinst); extern void vas_window_init_dbgdir(struct vas_window *win); extern void vas_window_free_dbgdir(struct vas_window *win); extern int vas_setup_fault_window(struct vas_instance *vinst); +extern irqreturn_t vas_fault_thread_fn(int irq, void *data); +extern irqreturn_t vas_fault_handler(int irq, void *dev_id); +extern struct vas_window *vas_pswid_to_window(struct vas_instance *vinst, + uint32_t pswid); static inline int vas_window_pid(struct vas_window *window) { |