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Date: Mon, 5 Aug 2013 16:06:20 -0400
From: Chris Metcalf <cmetcalf@...era.com>
To: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: [PATCH 07/20] tile PCI RC: support more MSI-X interrupt vectors
To support PCIe devices with higher number of MSI-X interrupt vectors,
e.g. 16 for the LSI RAID card, enhance the Gx RC stack to provide more
MSI-X vectors by using the TRIO Scatter Queues, which provide 8 more
vectors in addition to ~10 from the Map Mem regions.
Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
---
arch/tile/gxio/iorpc_trio.c | 23 +++++++++++++++
arch/tile/include/arch/trio.h | 39 ++++++++++++++++++++++++
arch/tile/include/gxio/iorpc_trio.h | 5 ++++
arch/tile/kernel/pci_gx.c | 59 ++++++++++++++++++++++++-------------
4 files changed, 106 insertions(+), 20 deletions(-)
diff --git a/arch/tile/gxio/iorpc_trio.c b/arch/tile/gxio/iorpc_trio.c
index cef4b22..da6e18e 100644
--- a/arch/tile/gxio/iorpc_trio.c
+++ b/arch/tile/gxio/iorpc_trio.c
@@ -61,6 +61,29 @@ int gxio_trio_alloc_memory_maps(gxio_trio_context_t * context,
EXPORT_SYMBOL(gxio_trio_alloc_memory_maps);
+struct alloc_scatter_queues_param {
+ unsigned int count;
+ unsigned int first;
+ unsigned int flags;
+};
+
+int gxio_trio_alloc_scatter_queues(gxio_trio_context_t * context,
+ unsigned int count, unsigned int first,
+ unsigned int flags)
+{
+ struct alloc_scatter_queues_param temp;
+ struct alloc_scatter_queues_param *params = &temp;
+
+ params->count = count;
+ params->first = first;
+ params->flags = flags;
+
+ return hv_dev_pwrite(context->fd, 0, (HV_VirtAddr) params,
+ sizeof(*params),
+ GXIO_TRIO_OP_ALLOC_SCATTER_QUEUES);
+}
+
+EXPORT_SYMBOL(gxio_trio_alloc_scatter_queues);
struct alloc_pio_regions_param {
unsigned int count;
diff --git a/arch/tile/include/arch/trio.h b/arch/tile/include/arch/trio.h
index d3000a8..c0ddedc 100644
--- a/arch/tile/include/arch/trio.h
+++ b/arch/tile/include/arch/trio.h
@@ -23,6 +23,45 @@
#ifndef __ASSEMBLER__
/*
+ * Map SQ Doorbell Format.
+ * This describes the format of the write-only doorbell register that exists
+ * in the last 8-bytes of the MAP_SQ_BASE/LIM range. This register is only
+ * writable from PCIe space. Writes to this register will not be written to
+ * Tile memory space and thus no IO VA translation is required if the last
+ * page of the BASE/LIM range is not otherwise written.
+ */
+
+__extension__
+typedef union
+{
+ struct
+ {
+#ifndef __BIG_ENDIAN__
+ /*
+ * When written with a 1, the associated MAP_SQ region's doorbell
+ * interrupt will be triggered once all previous writes are visible to
+ * Tile software.
+ */
+ uint_reg_t doorbell : 1;
+ /*
+ * When written with a 1, the descriptor at the head of the associated
+ * MAP_SQ's FIFO will be dequeued.
+ */
+ uint_reg_t pop : 1;
+ /* Reserved. */
+ uint_reg_t __reserved : 62;
+#else /* __BIG_ENDIAN__ */
+ uint_reg_t __reserved : 62;
+ uint_reg_t pop : 1;
+ uint_reg_t doorbell : 1;
+#endif
+ };
+
+ uint_reg_t word;
+} TRIO_MAP_SQ_DOORBELL_FMT_t;
+
+
+/*
* Tile PIO Region Configuration - CFG Address Format.
* This register describes the address format for PIO accesses when the
* associated region is setup with TYPE=CFG.
diff --git a/arch/tile/include/gxio/iorpc_trio.h b/arch/tile/include/gxio/iorpc_trio.h
index 58105c3..d95b96f 100644
--- a/arch/tile/include/gxio/iorpc_trio.h
+++ b/arch/tile/include/gxio/iorpc_trio.h
@@ -30,6 +30,7 @@
#define GXIO_TRIO_OP_ALLOC_MEMORY_MAPS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1404)
+#define GXIO_TRIO_OP_ALLOC_SCATTER_QUEUES IORPC_OPCODE(IORPC_FORMAT_NONE, 0x140e)
#define GXIO_TRIO_OP_ALLOC_PIO_REGIONS IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1412)
#define GXIO_TRIO_OP_INIT_PIO_REGION_AUX IORPC_OPCODE(IORPC_FORMAT_NONE, 0x1414)
@@ -54,6 +55,10 @@ int gxio_trio_alloc_memory_maps(gxio_trio_context_t * context,
unsigned int flags);
+int gxio_trio_alloc_scatter_queues(gxio_trio_context_t * context,
+ unsigned int count, unsigned int first,
+ unsigned int flags);
+
int gxio_trio_alloc_pio_regions(gxio_trio_context_t * context,
unsigned int count, unsigned int first,
unsigned int flags);
diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
index 2cc3e64..e0d6664 100644
--- a/arch/tile/kernel/pci_gx.c
+++ b/arch/tile/kernel/pci_gx.c
@@ -1474,32 +1474,55 @@ int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
trio_context = controller->trio;
/*
- * Allocate the Mem-Map that will accept the MSI write and
- * trigger the TILE-side interrupts.
+ * Allocate a scatter-queue that will accept the MSI write and
+ * trigger the TILE-side interrupts. We use the scatter-queue regions
+ * before the mem map regions, because the latter are needed by more
+ * applications.
*/
- mem_map = gxio_trio_alloc_memory_maps(trio_context, 1, 0, 0);
- if (mem_map < 0) {
- dev_printk(KERN_INFO, &pdev->dev,
- "%s Mem-Map alloc failure. "
- "Failed to initialize MSI interrupts. "
- "Falling back to legacy interrupts.\n",
- desc->msi_attrib.is_msix ? "MSI-X" : "MSI");
+ mem_map = gxio_trio_alloc_scatter_queues(trio_context, 1, 0, 0);
+ if (mem_map >= 0) {
+ TRIO_MAP_SQ_DOORBELL_FMT_t doorbell_template = {{
+ .pop = 0,
+ .doorbell = 1,
+ }};
+
+ mem_map += TRIO_NUM_MAP_MEM_REGIONS;
+ mem_map_base = MEM_MAP_INTR_REGIONS_BASE +
+ mem_map * MEM_MAP_INTR_REGION_SIZE;
+ mem_map_limit = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 1;
+
+ msi_addr = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 8;
+ msg.data = (unsigned int)doorbell_template.word;
+ } else {
+ /* SQ regions are out, allocate from map mem regions. */
+ mem_map = gxio_trio_alloc_memory_maps(trio_context, 1, 0, 0);
+ if (mem_map < 0) {
+ dev_printk(KERN_INFO, &pdev->dev,
+ "%s Mem-Map alloc failure. "
+ "Failed to initialize MSI interrupts. "
+ "Falling back to legacy interrupts.\n",
+ desc->msi_attrib.is_msix ? "MSI-X" : "MSI");
+ ret = -ENOMEM;
+ goto msi_mem_map_alloc_failure;
+ }
- ret = -ENOMEM;
- goto msi_mem_map_alloc_failure;
+ mem_map_base = MEM_MAP_INTR_REGIONS_BASE +
+ mem_map * MEM_MAP_INTR_REGION_SIZE;
+ mem_map_limit = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 1;
+
+ msi_addr = mem_map_base + TRIO_MAP_MEM_REG_INT3 -
+ TRIO_MAP_MEM_REG_INT0;
+
+ msg.data = mem_map;
}
/* We try to distribute different IRQs to different tiles. */
cpu = tile_irq_cpu(irq);
/*
- * Now call up to the HV to configure the Mem-Map interrupt and
+ * Now call up to the HV to configure the MSI interrupt and
* set up the IPI binding.
*/
- mem_map_base = MEM_MAP_INTR_REGIONS_BASE +
- mem_map * MEM_MAP_INTR_REGION_SIZE;
- mem_map_limit = mem_map_base + MEM_MAP_INTR_REGION_SIZE - 1;
-
ret = gxio_trio_config_msi_intr(trio_context, cpu_x(cpu), cpu_y(cpu),
KERNEL_PL, irq, controller->mac,
mem_map, mem_map_base, mem_map_limit,
@@ -1512,13 +1535,9 @@ int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
irq_set_msi_desc(irq, desc);
- msi_addr = mem_map_base + TRIO_MAP_MEM_REG_INT3 - TRIO_MAP_MEM_REG_INT0;
-
msg.address_hi = msi_addr >> 32;
msg.address_lo = msi_addr & 0xffffffff;
- msg.data = mem_map;
-
write_msi_msg(irq, &msg);
irq_set_chip_and_handler(irq, &tilegx_msi_chip, handle_level_irq);
irq_set_handler_data(irq, controller);
--
1.8.3.1
--
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