linux-kernel - [PATCH] habanalabs/gaudi: use direct MSI in single mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Date:   Wed,  1 Sep 2021 19:50:16 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Omer Shpigelman <oshpigelman@...ana.ai>
Subject: [PATCH] habanalabs/gaudi: use direct MSI in single mode

From: Omer Shpigelman <oshpigelman@...ana.ai>

Due to FLR scenario when running inside a VM, we must not use indirect
MSI because it might cause some issues on VM destroy.
In a VM we use single MSI mode in contrary to multi MSI mode which is
used in bare-metal.
Hence direct MSI should be used in single MSI mode only.

Signed-off-by: Omer Shpigelman <oshpigelman@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi/gaudi.c                    | 9 ++++++---
 .../misc/habanalabs/include/gaudi/asic_reg/gaudi_regs.h  | 2 ++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 383865be3c2c..5249f8fd4d59 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -5802,6 +5802,7 @@ static void gaudi_add_end_of_cb_packets(struct hl_device *hdev,
 {
 	struct gaudi_device *gaudi = hdev->asic_specific;
 	struct packet_msg_prot *cq_pkt;
+	u64 msi_addr;
 	u32 tmp;
 
 	cq_pkt = kernel_address + len - (sizeof(struct packet_msg_prot) * 2);
@@ -5823,10 +5824,12 @@ static void gaudi_add_end_of_cb_packets(struct hl_device *hdev,
 	cq_pkt->ctl = cpu_to_le32(tmp);
 	cq_pkt->value = cpu_to_le32(1);
 
-	if (!gaudi->multi_msi_mode)
-		msi_vec = 0;
+	if (gaudi->multi_msi_mode)
+		msi_addr = mmPCIE_MSI_INTR_0 + msi_vec * 4;
+	else
+		msi_addr = mmPCIE_CORE_MSI_REQ;
 
-	cq_pkt->addr = cpu_to_le64(CFG_BASE + mmPCIE_MSI_INTR_0 + msi_vec * 4);
+	cq_pkt->addr = cpu_to_le64(CFG_BASE + msi_addr);
 }
 
 static void gaudi_update_eq_ci(struct hl_device *hdev, u32 val)
diff --git a/drivers/misc/habanalabs/include/gaudi/asic_reg/gaudi_regs.h b/drivers/misc/habanalabs/include/gaudi/asic_reg/gaudi_regs.h
index ffdfbd9b3220..1a6576666794 100644
--- a/drivers/misc/habanalabs/include/gaudi/asic_reg/gaudi_regs.h
+++ b/drivers/misc/habanalabs/include/gaudi/asic_reg/gaudi_regs.h
@@ -308,6 +308,8 @@
 #define mmPCIE_AUX_FLR_CTRL                                          0xC07394
 #define mmPCIE_AUX_DBI                                               0xC07490
 
+#define mmPCIE_CORE_MSI_REQ                                          0xC04100
+
 #define mmPSOC_PCI_PLL_NR                                            0xC72100
 #define mmSRAM_W_PLL_NR                                              0x4C8100
 #define mmPSOC_HBM_PLL_NR                                            0xC74100
-- 
2.17.1