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Date: Mon, 11 Jul 2022 09:29:57 +0300
From: Oded Gabbay <ogabbay@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Tomer Tayar <ttayar@...ana.ai>
Subject: [PATCH 06/12] habanalabs/gaudi2: modify decoder to use virtual MSI-X doorbell
From: Tomer Tayar <ttayar@...ana.ai>
Modify the decoder wrapper blocks to generate interrupts using the
virtual MSI-X doorbell.
As a decoder wrapper block cannot write directly to HBW upon completion,
it writes instead to SOB which is monitored by a master monitor.
When resolved, this monitor will be the one to actually write to the
virtual MSI-X doorbell.
Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
drivers/misc/habanalabs/gaudi2/gaudi2.c | 141 +++++++++++++++++-
drivers/misc/habanalabs/gaudi2/gaudi2P.h | 15 ++
drivers/misc/habanalabs/gaudi2/gaudi2_masks.h | 3 +
.../include/gaudi2/asic_reg/gaudi2_regs.h | 6 +
4 files changed, 160 insertions(+), 5 deletions(-)
diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2.c b/drivers/misc/habanalabs/gaudi2/gaudi2.c
index 60e11007e3ea..760ce5b7f955 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/misc/habanalabs/gaudi2/gaudi2.c
@@ -4252,6 +4252,109 @@ static void gaudi2_init_edma(struct hl_device *hdev)
}
}
+/*
+ * gaudi2_arm_monitors_for_virt_msix_db() - Arm monitors for writing to the virtual MSI-X doorbell.
+ * @hdev: pointer to habanalabs device structure.
+ * @sob_id: sync object ID.
+ * @first_mon_id: ID of first monitor out of 3 consecutive monitors.
+ * @interrupt_id: interrupt ID.
+ *
+ * Some initiators cannot have HBW address in their completion address registers, and thus cannot
+ * write directly to the HBW host memory of the virtual MSI-X doorbell.
+ * Instead, they are configured to LBW write to a sync object, and a monitor will do the HBW write.
+ *
+ * The mechanism in the sync manager block is composed of a master monitor with 3 messages.
+ * In addition to the HBW write, the other 2 messages are for preparing the monitor to next
+ * completion, by decrementing the sync object value and re-arming the monitor.
+ */
+static void gaudi2_arm_monitors_for_virt_msix_db(struct hl_device *hdev, u32 sob_id,
+ u32 first_mon_id, u32 interrupt_id)
+{
+ u32 sob_offset, first_mon_offset, mon_offset, payload, sob_group, mode, arm, config;
+ struct gaudi2_device *gaudi2 = hdev->asic_specific;
+ u64 addr;
+ u8 mask;
+
+ /* Reset the SOB value */
+ sob_offset = sob_id * sizeof(u32);
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_SOB_OBJ_0 + sob_offset, 0);
+
+ /* Configure 3 monitors:
+ * 1. Write interrupt ID to the virtual MSI-X doorbell (master monitor)
+ * 2. Decrement SOB value by 1.
+ * 3. Re-arm the master monitor.
+ */
+
+ first_mon_offset = first_mon_id * sizeof(u32);
+
+ /* 2nd monitor: Decrement SOB value by 1 */
+ mon_offset = first_mon_offset + sizeof(u32);
+
+ addr = CFG_BASE + mmDCORE0_SYNC_MNGR_OBJS_SOB_OBJ_0 + sob_offset;
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_ADDRL_0 + mon_offset, lower_32_bits(addr));
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_ADDRH_0 + mon_offset, upper_32_bits(addr));
+
+ payload = FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_VAL_MASK, 0x7FFF) | /* "-1" */
+ FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_SIGN_MASK, 1) |
+ FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_INC_MASK, 1);
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_DATA_0 + mon_offset, payload);
+
+ /* 3rd monitor: Re-arm the master monitor */
+ mon_offset = first_mon_offset + 2 * sizeof(u32);
+
+ addr = CFG_BASE + mmDCORE0_SYNC_MNGR_OBJS_MON_ARM_0 + first_mon_offset;
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_ADDRL_0 + mon_offset, lower_32_bits(addr));
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_ADDRH_0 + mon_offset, upper_32_bits(addr));
+
+ sob_group = sob_id / 8;
+ mask = ~BIT(sob_id & 0x7);
+ mode = 0; /* comparison mode is "greater than or equal to" */
+ arm = FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_MON_ARM_SID_MASK, sob_group) |
+ FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_MON_ARM_MASK_MASK, mask) |
+ FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_MON_ARM_SOP_MASK, mode) |
+ FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_MON_ARM_SOD_MASK, 1);
+
+ payload = arm;
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_DATA_0 + mon_offset, payload);
+
+ /* 1st monitor (master): Write interrupt ID to the virtual MSI-X doorbell */
+ mon_offset = first_mon_offset;
+
+ config = FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_MON_CONFIG_WR_NUM_MASK, 2); /* "2": 3 writes */
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_CONFIG_0 + mon_offset, config);
+
+ addr = gaudi2->virt_msix_db_dma_addr;
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_ADDRL_0 + mon_offset, lower_32_bits(addr));
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_ADDRH_0 + mon_offset, upper_32_bits(addr));
+
+ payload = interrupt_id;
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_PAY_DATA_0 + mon_offset, payload);
+
+ WREG32(mmDCORE0_SYNC_MNGR_OBJS_MON_ARM_0 + mon_offset, arm);
+}
+
+static void gaudi2_prepare_sm_for_virt_msix_db(struct hl_device *hdev)
+{
+ u32 decoder_id, sob_id, first_mon_id, interrupt_id;
+ struct asic_fixed_properties *prop = &hdev->asic_prop;
+
+ /* Decoder normal/abnormal interrupts */
+ for (decoder_id = 0 ; decoder_id < NUMBER_OF_DEC ; ++decoder_id) {
+ if (!(prop->decoder_enabled_mask & BIT(decoder_id)))
+ continue;
+
+ sob_id = GAUDI2_RESERVED_SOB_DEC_NRM_FIRST + decoder_id;
+ first_mon_id = GAUDI2_RESERVED_MON_DEC_NRM_FIRST + 3 * decoder_id;
+ interrupt_id = GAUDI2_IRQ_NUM_DCORE0_DEC0_NRM + 2 * decoder_id;
+ gaudi2_arm_monitors_for_virt_msix_db(hdev, sob_id, first_mon_id, interrupt_id);
+
+ sob_id = GAUDI2_RESERVED_SOB_DEC_ABNRM_FIRST + decoder_id;
+ first_mon_id = GAUDI2_RESERVED_MON_DEC_ABNRM_FIRST + 3 * decoder_id;
+ interrupt_id += 1;
+ gaudi2_arm_monitors_for_virt_msix_db(hdev, sob_id, first_mon_id, interrupt_id);
+ }
+}
+
static void gaudi2_init_sm(struct hl_device *hdev)
{
struct gaudi2_device *gaudi2 = hdev->asic_specific;
@@ -4304,6 +4407,9 @@ static void gaudi2_init_sm(struct hl_device *hdev)
/* Configure kernel ASID and MMU BP*/
WREG32(mmDCORE0_SYNC_MNGR_GLBL_ASID_SEC, 0x10000);
WREG32(mmDCORE0_SYNC_MNGR_GLBL_ASID_NONE_SEC_PRIV, 0);
+
+ /* Initialize sync objects and monitors which are used for the virtual MSI-X doorbell */
+ gaudi2_prepare_sm_for_virt_msix_db(hdev);
}
static void gaudi2_init_mme_acc(struct hl_device *hdev, u32 reg_base)
@@ -4452,10 +4558,35 @@ static void gaudi2_init_rotator(struct hl_device *hdev)
}
}
-static void gaudi2_init_vdec_brdg_ctrl(struct hl_device *hdev, u64 base_addr, u32 msix_id)
+static void gaudi2_init_vdec_brdg_ctrl(struct hl_device *hdev, u64 base_addr, u32 decoder_id)
{
- WREG32(base_addr + BRDG_CTRL_NRM_MSIX_LBW_WDATA, msix_id);
- WREG32(base_addr + BRDG_CTRL_ABNRM_MSIX_LBW_WDATA, msix_id + 1);
+ u32 sob_id;
+
+ /* TODO:
+ * Remove when virtual MSI-X doorbell is supported in simulator (SW-93022) and in F/W
+ * (SW-93024).
+ */
+ if (!hdev->pdev || hdev->asic_prop.fw_security_enabled) {
+ u32 interrupt_id = GAUDI2_IRQ_NUM_DCORE0_DEC0_NRM + 2 * decoder_id;
+
+ WREG32(base_addr + BRDG_CTRL_NRM_MSIX_LBW_AWADDR, mmPCIE_DBI_MSIX_DOORBELL_OFF);
+ WREG32(base_addr + BRDG_CTRL_NRM_MSIX_LBW_WDATA, interrupt_id);
+ WREG32(base_addr + BRDG_CTRL_ABNRM_MSIX_LBW_AWADDR, mmPCIE_DBI_MSIX_DOORBELL_OFF);
+ WREG32(base_addr + BRDG_CTRL_ABNRM_MSIX_LBW_WDATA, interrupt_id + 1);
+ return;
+ }
+
+ /* VCMD normal interrupt */
+ sob_id = GAUDI2_RESERVED_SOB_DEC_NRM_FIRST + decoder_id;
+ WREG32(base_addr + BRDG_CTRL_NRM_MSIX_LBW_AWADDR,
+ mmDCORE0_SYNC_MNGR_OBJS_SOB_OBJ_0 + sob_id * sizeof(u32));
+ WREG32(base_addr + BRDG_CTRL_NRM_MSIX_LBW_WDATA, GAUDI2_SOB_INCREMENT_BY_ONE);
+
+ /* VCMD abnormal interrupt */
+ sob_id = GAUDI2_RESERVED_SOB_DEC_ABNRM_FIRST + decoder_id;
+ WREG32(base_addr + BRDG_CTRL_ABNRM_MSIX_LBW_AWADDR,
+ mmDCORE0_SYNC_MNGR_OBJS_SOB_OBJ_0 + sob_id * sizeof(u32));
+ WREG32(base_addr + BRDG_CTRL_ABNRM_MSIX_LBW_WDATA, GAUDI2_SOB_INCREMENT_BY_ONE);
}
static void gaudi2_init_dec(struct hl_device *hdev)
@@ -4485,7 +4616,7 @@ static void gaudi2_init_dec(struct hl_device *hdev)
msix_id = GAUDI2_IRQ_NUM_DCORE0_DEC0_NRM +
(dcore_id * NUM_OF_DEC_PER_DCORE + dec_id) * 2;
- gaudi2_init_vdec_brdg_ctrl(hdev, base_addr, msix_id);
+ gaudi2_init_vdec_brdg_ctrl(hdev, base_addr, dec_bit);
gaudi2->dec_hw_cap_initialized |= BIT_ULL(HW_CAP_DEC_SHIFT + dec_bit);
}
@@ -4500,7 +4631,7 @@ static void gaudi2_init_dec(struct hl_device *hdev)
msix_id = GAUDI2_IRQ_NUM_SHARED_DEC0_NRM + (dec_id * 2);
- gaudi2_init_vdec_brdg_ctrl(hdev, base_addr, msix_id);
+ gaudi2_init_vdec_brdg_ctrl(hdev, base_addr, dec_bit);
gaudi2->dec_hw_cap_initialized |= BIT_ULL(HW_CAP_DEC_SHIFT + dec_bit);
}
diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2P.h b/drivers/misc/habanalabs/gaudi2/gaudi2P.h
index 826d24284dc5..e4bc4009f05b 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2P.h
+++ b/drivers/misc/habanalabs/gaudi2/gaudi2P.h
@@ -243,11 +243,20 @@
#define GAUDI2_ARC_PCI_MSB_ADDR(addr) (((addr) & GENMASK_ULL(49, 28)) >> 28)
+#define GAUDI2_SOB_INCREMENT_BY_ONE (FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_VAL_MASK, 1) | \
+ FIELD_PREP(DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_INC_MASK, 1))
+
enum gaudi2_reserved_sob_id {
GAUDI2_RESERVED_SOB_CS_COMPLETION_FIRST,
GAUDI2_RESERVED_SOB_CS_COMPLETION_LAST =
GAUDI2_RESERVED_SOB_CS_COMPLETION_FIRST + GAUDI2_MAX_PENDING_CS - 1,
GAUDI2_RESERVED_SOB_KDMA_COMPLETION,
+ GAUDI2_RESERVED_SOB_DEC_NRM_FIRST,
+ GAUDI2_RESERVED_SOB_DEC_NRM_LAST =
+ GAUDI2_RESERVED_SOB_DEC_NRM_FIRST + NUMBER_OF_DEC - 1,
+ GAUDI2_RESERVED_SOB_DEC_ABNRM_FIRST,
+ GAUDI2_RESERVED_SOB_DEC_ABNRM_LAST =
+ GAUDI2_RESERVED_SOB_DEC_ABNRM_FIRST + NUMBER_OF_DEC - 1,
GAUDI2_RESERVED_SOB_NUMBER
};
@@ -256,6 +265,12 @@ enum gaudi2_reserved_mon_id {
GAUDI2_RESERVED_MON_CS_COMPLETION_LAST =
GAUDI2_RESERVED_MON_CS_COMPLETION_FIRST + GAUDI2_MAX_PENDING_CS - 1,
GAUDI2_RESERVED_MON_KDMA_COMPLETION,
+ GAUDI2_RESERVED_MON_DEC_NRM_FIRST,
+ GAUDI2_RESERVED_MON_DEC_NRM_LAST =
+ GAUDI2_RESERVED_MON_DEC_NRM_FIRST + 3 * NUMBER_OF_DEC - 1,
+ GAUDI2_RESERVED_MON_DEC_ABNRM_FIRST,
+ GAUDI2_RESERVED_MON_DEC_ABNRM_LAST =
+ GAUDI2_RESERVED_MON_DEC_ABNRM_FIRST + 3 * NUMBER_OF_DEC - 1,
GAUDI2_RESERVED_MON_NUMBER
};
diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2_masks.h b/drivers/misc/habanalabs/gaudi2/gaudi2_masks.h
index 3fd5cf4a8645..eed16d642a5a 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2_masks.h
+++ b/drivers/misc/habanalabs/gaudi2/gaudi2_masks.h
@@ -135,4 +135,7 @@
#define PCIE_DBI_MSIX_ADDRESS_MATCH_LOW_OFF_MSIX_ADDRESS_MATCH_EN_SHIFT 0
#define PCIE_DBI_MSIX_ADDRESS_MATCH_LOW_OFF_MSIX_ADDRESS_MATCH_EN_MASK 0x1
+#define DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_SIGN_SHIFT 15
+#define DCORE0_SYNC_MNGR_OBJS_SOB_OBJ_SIGN_MASK 0x8000
+
#endif /* GAUDI2_MASKS_H_ */
diff --git a/drivers/misc/habanalabs/include/gaudi2/asic_reg/gaudi2_regs.h b/drivers/misc/habanalabs/include/gaudi2/asic_reg/gaudi2_regs.h
index e5fe9d5e07f5..d0e2c68a639f 100644
--- a/drivers/misc/habanalabs/include/gaudi2/asic_reg/gaudi2_regs.h
+++ b/drivers/misc/habanalabs/include/gaudi2/asic_reg/gaudi2_regs.h
@@ -415,9 +415,15 @@
#define SFT_DCORE_OFFSET (mmSFT1_HBW_RTR_IF0_RTR_CTRL_BASE - mmSFT0_HBW_RTR_IF0_RTR_CTRL_BASE)
#define SFT_IF_OFFSET (mmSFT0_HBW_RTR_IF1_RTR_CTRL_BASE - mmSFT0_HBW_RTR_IF0_RTR_CTRL_BASE)
+#define BRDG_CTRL_NRM_MSIX_LBW_AWADDR \
+ (mmDCORE0_VDEC0_BRDG_CTRL_NRM_MSIX_LBW_AWADDR - mmDCORE0_VDEC0_BRDG_CTRL_BASE)
+
#define BRDG_CTRL_NRM_MSIX_LBW_WDATA \
(mmDCORE0_VDEC0_BRDG_CTRL_NRM_MSIX_LBW_WDATA - mmDCORE0_VDEC0_BRDG_CTRL_BASE)
+#define BRDG_CTRL_ABNRM_MSIX_LBW_AWADDR \
+ (mmDCORE0_VDEC0_BRDG_CTRL_ABNRM_MSIX_LBW_AWADDR - mmDCORE0_VDEC0_BRDG_CTRL_BASE)
+
#define BRDG_CTRL_ABNRM_MSIX_LBW_WDATA \
(mmDCORE0_VDEC0_BRDG_CTRL_ABNRM_MSIX_LBW_WDATA - mmDCORE0_VDEC0_BRDG_CTRL_BASE)
--
2.25.1
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