From: Haren Myneni <haren@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: mikey@neuling.org, srikar@linux.vnet.ibm.com,
frederic.barrat@fr.ibm.com, ajd@linux.ibm.com,
linux-kernel@vger.kernel.org, npiggin@gmail.com,
hch@infradead.org, oohall@gmail.com, clg@kaod.org,
sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
herbert@gondor.apana.org.au
Subject: [PATCH v10 02/14] powerpc/vas: Define nx_fault_stamp in coprocessor_request_block
Date: Thu, 02 Apr 2020 00:09:52 -0700 [thread overview]
Message-ID: <1585811392.2275.36.camel@hbabu-laptop> (raw)
In-Reply-To: <1585810846.2275.23.camel@hbabu-laptop>
Kernel sets fault address and status in CRB for NX page fault on user
space address after processing page fault. User space gets the signal
and handles the fault mentioned in CRB by bringing the page in to
memory and send NX request again.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
---
arch/powerpc/include/asm/icswx.h | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h
index 9872f85..965b1f3 100644
--- a/arch/powerpc/include/asm/icswx.h
+++ b/arch/powerpc/include/asm/icswx.h
@@ -108,6 +108,17 @@ struct data_descriptor_entry {
__be64 address;
} __packed __aligned(DDE_ALIGN);
+/* 4.3.2 NX-stamped Fault CRB */
+
+#define NX_STAMP_ALIGN (0x10)
+
+struct nx_fault_stamp {
+ __be64 fault_storage_addr;
+ __be16 reserved;
+ __u8 flags;
+ __u8 fault_status;
+ __be32 pswid;
+} __packed __aligned(NX_STAMP_ALIGN);
/* Chapter 6.5.2 Coprocessor-Request Block (CRB) */
@@ -135,10 +146,15 @@ struct coprocessor_request_block {
struct coprocessor_completion_block ccb;
- u8 reserved[48];
+ union {
+ struct nx_fault_stamp nx;
+ u8 reserved[16];
+ } stamp;
+
+ u8 reserved[32];
struct coprocessor_status_block csb;
-} __packed __aligned(CRB_ALIGN);
+} __packed;
/* RFC02167 Initiate Coprocessor Instructions document
--
1.8.3.1
next prev parent reply other threads:[~2020-04-02 7:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 7:00 [PATCH v10 00/14] powerpc/vas: Page fault handling for user space NX requests Haren Myneni
2020-04-02 7:09 ` [PATCH v10 01/14] powerpc/xive: Define xive_native_alloc_irq_on_chip() Haren Myneni
2020-04-02 7:09 ` Haren Myneni [this message]
2020-04-02 7:10 ` [PATCH v10 03/14] powerpc/vas: Alloc and setup IRQ and trigger port address Haren Myneni
2020-04-02 8:08 ` Cédric Le Goater
2020-04-02 7:11 ` [PATCH v10 04/14] powerpc/vas: Setup fault window per VAS instance Haren Myneni
2020-04-02 7:11 ` [PATCH v10 05/14] powerpc/vas: Register NX with fault window ID and IRQ port value Haren Myneni
2020-04-02 7:13 ` [PATCH v10 06/14] powerpc/vas: Take reference to PID and mm for user space windows Haren Myneni
2020-04-02 7:13 ` [PATCH v10 07/14] powerpc/vas: Setup thread IRQ handler per VAS instance Haren Myneni
2020-04-02 7:14 ` [PATCH v10 08/14] powerpc/vas: Update CSB and notify process for fault CRBs Haren Myneni
2020-04-02 7:15 ` [PATCH v10 09/14] powerpc/vas: Return credits after handling fault Haren Myneni
2020-04-02 7:16 ` [PATCH v10 10/14] powerpc/vas: Print CRB and FIFO values Haren Myneni
2020-04-02 7:17 ` [PATCH v10 11/14] powerpc/vas: Do not use default credits for receive window Haren Myneni
2020-04-02 7:18 ` [PATCH v10 12/14] powerpc/vas: Display process stuck message Haren Myneni
2020-04-02 7:19 ` [PATCH v10 13/14] powerpc/vas: Free send window in VAS instance after credits returned Haren Myneni
2020-04-02 7:20 ` [PATCH v10 14/14] powerpc: Use mm_context vas_windows counter to issue CP_ABORT Haren Myneni
2020-04-11 10:28 ` Michael Ellerman
2020-04-14 7:54 ` Haren Myneni
2020-04-03 8:19 ` [PATCH v10 00/14] powerpc/vas: Page fault handling for user space NX requests Cédric Le Goater
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