From: Ben Widawsky <ben.widawsky@intel.com> To: qemu-devel@nongnu.org Cc: "Ben Widawsky" <ben.widawsky@intel.com>, linux-cxl@vger.kernel.org, "Chris Browy" <cbrowy@avery-design.com>, "Dan Williams" <dan.j.williams@intel.com>, "David Hildenbrand" <david@redhat.com>, "Igor Mammedov" <imammedo@redhat.com>, "Ira Weiny" <ira.weiny@intel.com>, "Jonathan Cameron" <Jonathan.Cameron@Huawei.com>, "Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>, "Markus Armbruster" <armbru@redhat.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, "Vishal Verma" <vishal.l.verma@intel.com>, "John Groves (jgroves)" <jgroves@micron.com>, "Michael S. Tsirkin" <mst@redhat.com> Subject: [RFC PATCH v3 22/31] hw/cxl/device: Implement MMIO HDM decoding (8.2.5.12) Date: Mon, 1 Feb 2021 16:59:39 -0800 [thread overview] Message-ID: <20210202005948.241655-23-ben.widawsky@intel.com> (raw) In-Reply-To: <20210202005948.241655-1-ben.widawsky@intel.com> A device's volatile and persistent memory are known Host Defined Memory (HDM) regions. The mechanism by which the device is programmed to claim the addresses associated with those regions is through dedicated logic known as the HDM decoder. In order to allow the OS to properly program the HDMs, the HDM decoders must be modeled. There are two ways the HDM decoders can be implemented, the legacy mechanism is through the PCIe DVSEC programming from CXL 1.1 (8.1.3.8), and MMIO is found in 8.2.5.12 of the spec. For now, 8.1.3.8 is not implemented. Much of CXL device logic is implemented in cxl-utils. The HDM decoder however is implemented directly by the device implementation. The generic cxl-utils probably should be the correct place to put this since HDM decoders aren't unique to a type3 device. It is however easier at the moment, and requires less design consideration to simply implement it in the device, and figure out how to consolidate it later. Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> --- hw/mem/cxl_type3.c | 92 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 84 insertions(+), 8 deletions(-) diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c index 4e9a016448..fe02c3b63c 100644 --- a/hw/mem/cxl_type3.c +++ b/hw/mem/cxl_type3.c @@ -57,6 +57,84 @@ static void build_dvsecs(CXLType3Dev *ct3d) REG_LOC_DVSEC_REVID, dvsec); } +static void cxl_set_addr(CXLType3Dev *ct3d, hwaddr addr, Error **errp) +{ + MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(ct3d); + mdc->set_addr(MEMORY_DEVICE(ct3d), addr, errp); +} + +static void hdm_decoder_commit(CXLType3Dev *ct3d, int which) +{ + MemoryRegion *pmem = ct3d->cxl_dstate.pmem; + MemoryRegion *mr = host_memory_backend_get_memory(ct3d->hostmem); + Range window, device; + ComponentRegisters *cregs = &ct3d->cxl_cstate.crb; + uint32_t *cache_mem = cregs->cache_mem_registers; + uint64_t offset, size; + Error *err = NULL; + + assert(which == 0); + + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, COMMIT, 0); + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 0); + + offset = ((uint64_t)cache_mem[R_CXL_HDM_DECODER0_BASE_HI] << 32) | + cache_mem[R_CXL_HDM_DECODER0_BASE_LO]; + size = ((uint64_t)cache_mem[R_CXL_HDM_DECODER0_SIZE_HI] << 32) | + cache_mem[R_CXL_HDM_DECODER0_SIZE_LO]; + + range_init_nofail(&window, mr->addr, memory_region_size(mr)); + range_init_nofail(&device, offset, size); + + if (!range_contains_range(&window, &device)) { + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 1); + return; + } + + /* + * FIXME: Support resizing. + * Maybe just memory_region_ram_resize(pmem, size, &err)? + */ + if (size != memory_region_size(pmem)) { + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 1); + return; + } + + cxl_set_addr(ct3d, offset, &err); + if (err) { + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 1); + return; + } + memory_region_set_enabled(pmem, true); + + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, COMMITTED, 1); +} + +static void ct3d_reg_write(void *opaque, hwaddr offset, uint64_t value, unsigned size) +{ + CXLComponentState *cxl_cstate = opaque; + ComponentRegisters *cregs = &cxl_cstate->crb; + CXLType3Dev *ct3d = container_of(cxl_cstate, CXLType3Dev, cxl_cstate); + uint32_t *cache_mem = cregs->cache_mem_registers; + bool should_commit = false; + int which_hdm = -1; + + assert(size == 4); + + switch (offset) { + case A_CXL_HDM_DECODER0_CTRL: + should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT); + which_hdm = 0; + break; + default: + break; + } + + stl_le_p((uint8_t *)cache_mem + offset, value); + if (should_commit) + hdm_decoder_commit(ct3d, which_hdm); +} + static void ct3_instance_init(Object *obj) { /* MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj); */ @@ -65,18 +143,13 @@ static void ct3_instance_init(Object *obj) static void ct3_finalize(Object *obj) { CXLType3Dev *ct3d = CT3(obj); + CXLComponentState *cxl_cstate = &ct3d->cxl_cstate; + ComponentRegisters *regs = &cxl_cstate->crb; + g_free((void *)regs->special_ops); g_free(ct3d->cxl_dstate.pmem); } -#ifdef SET_PMEM_PADDR -static void cxl_set_addr(CXLType3Dev *ct3d, hwaddr addr, Error **errp) -{ - MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(ct3d); - mdc->set_addr(MEMORY_DEVICE(ct3d), addr, errp); -} -#endif - static void cxl_setup_memory(CXLType3Dev *ct3d, Error **errp) { MemoryRegionSection mrs; @@ -160,6 +233,9 @@ static void ct3_realize(PCIDevice *pci_dev, Error **errp) ct3d->cxl_cstate.pdev = pci_dev; build_dvsecs(ct3d); + regs->special_ops = g_new0(MemoryRegionOps, 1); + regs->special_ops->write = ct3d_reg_write; + cxl_component_register_block_init(OBJECT(pci_dev), cxl_cstate, TYPE_CXL_TYPE3_DEV); -- 2.30.0
WARNING: multiple messages have this Message-ID (diff)
From: Ben Widawsky <ben.widawsky@intel.com> To: qemu-devel@nongnu.org Cc: "Ben Widawsky" <ben.widawsky@intel.com>, "David Hildenbrand" <david@redhat.com>, "Vishal Verma" <vishal.l.verma@intel.com>, "John Groves (jgroves)" <jgroves@micron.com>, "Chris Browy" <cbrowy@avery-design.com>, "Markus Armbruster" <armbru@redhat.com>, linux-cxl@vger.kernel.org, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, "Michael S. Tsirkin" <mst@redhat.com>, "Jonathan Cameron" <Jonathan.Cameron@Huawei.com>, "Igor Mammedov" <imammedo@redhat.com>, "Dan Williams" <dan.j.williams@intel.com>, "Ira Weiny" <ira.weiny@intel.com> Subject: [RFC PATCH v3 22/31] hw/cxl/device: Implement MMIO HDM decoding (8.2.5.12) Date: Mon, 1 Feb 2021 16:59:39 -0800 [thread overview] Message-ID: <20210202005948.241655-23-ben.widawsky@intel.com> (raw) In-Reply-To: <20210202005948.241655-1-ben.widawsky@intel.com> A device's volatile and persistent memory are known Host Defined Memory (HDM) regions. The mechanism by which the device is programmed to claim the addresses associated with those regions is through dedicated logic known as the HDM decoder. In order to allow the OS to properly program the HDMs, the HDM decoders must be modeled. There are two ways the HDM decoders can be implemented, the legacy mechanism is through the PCIe DVSEC programming from CXL 1.1 (8.1.3.8), and MMIO is found in 8.2.5.12 of the spec. For now, 8.1.3.8 is not implemented. Much of CXL device logic is implemented in cxl-utils. The HDM decoder however is implemented directly by the device implementation. The generic cxl-utils probably should be the correct place to put this since HDM decoders aren't unique to a type3 device. It is however easier at the moment, and requires less design consideration to simply implement it in the device, and figure out how to consolidate it later. Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> --- hw/mem/cxl_type3.c | 92 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 84 insertions(+), 8 deletions(-) diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c index 4e9a016448..fe02c3b63c 100644 --- a/hw/mem/cxl_type3.c +++ b/hw/mem/cxl_type3.c @@ -57,6 +57,84 @@ static void build_dvsecs(CXLType3Dev *ct3d) REG_LOC_DVSEC_REVID, dvsec); } +static void cxl_set_addr(CXLType3Dev *ct3d, hwaddr addr, Error **errp) +{ + MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(ct3d); + mdc->set_addr(MEMORY_DEVICE(ct3d), addr, errp); +} + +static void hdm_decoder_commit(CXLType3Dev *ct3d, int which) +{ + MemoryRegion *pmem = ct3d->cxl_dstate.pmem; + MemoryRegion *mr = host_memory_backend_get_memory(ct3d->hostmem); + Range window, device; + ComponentRegisters *cregs = &ct3d->cxl_cstate.crb; + uint32_t *cache_mem = cregs->cache_mem_registers; + uint64_t offset, size; + Error *err = NULL; + + assert(which == 0); + + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, COMMIT, 0); + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 0); + + offset = ((uint64_t)cache_mem[R_CXL_HDM_DECODER0_BASE_HI] << 32) | + cache_mem[R_CXL_HDM_DECODER0_BASE_LO]; + size = ((uint64_t)cache_mem[R_CXL_HDM_DECODER0_SIZE_HI] << 32) | + cache_mem[R_CXL_HDM_DECODER0_SIZE_LO]; + + range_init_nofail(&window, mr->addr, memory_region_size(mr)); + range_init_nofail(&device, offset, size); + + if (!range_contains_range(&window, &device)) { + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 1); + return; + } + + /* + * FIXME: Support resizing. + * Maybe just memory_region_ram_resize(pmem, size, &err)? + */ + if (size != memory_region_size(pmem)) { + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 1); + return; + } + + cxl_set_addr(ct3d, offset, &err); + if (err) { + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, ERROR, 1); + return; + } + memory_region_set_enabled(pmem, true); + + ARRAY_FIELD_DP32(cache_mem, CXL_HDM_DECODER0_CTRL, COMMITTED, 1); +} + +static void ct3d_reg_write(void *opaque, hwaddr offset, uint64_t value, unsigned size) +{ + CXLComponentState *cxl_cstate = opaque; + ComponentRegisters *cregs = &cxl_cstate->crb; + CXLType3Dev *ct3d = container_of(cxl_cstate, CXLType3Dev, cxl_cstate); + uint32_t *cache_mem = cregs->cache_mem_registers; + bool should_commit = false; + int which_hdm = -1; + + assert(size == 4); + + switch (offset) { + case A_CXL_HDM_DECODER0_CTRL: + should_commit = FIELD_EX32(value, CXL_HDM_DECODER0_CTRL, COMMIT); + which_hdm = 0; + break; + default: + break; + } + + stl_le_p((uint8_t *)cache_mem + offset, value); + if (should_commit) + hdm_decoder_commit(ct3d, which_hdm); +} + static void ct3_instance_init(Object *obj) { /* MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj); */ @@ -65,18 +143,13 @@ static void ct3_instance_init(Object *obj) static void ct3_finalize(Object *obj) { CXLType3Dev *ct3d = CT3(obj); + CXLComponentState *cxl_cstate = &ct3d->cxl_cstate; + ComponentRegisters *regs = &cxl_cstate->crb; + g_free((void *)regs->special_ops); g_free(ct3d->cxl_dstate.pmem); } -#ifdef SET_PMEM_PADDR -static void cxl_set_addr(CXLType3Dev *ct3d, hwaddr addr, Error **errp) -{ - MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(ct3d); - mdc->set_addr(MEMORY_DEVICE(ct3d), addr, errp); -} -#endif - static void cxl_setup_memory(CXLType3Dev *ct3d, Error **errp) { MemoryRegionSection mrs; @@ -160,6 +233,9 @@ static void ct3_realize(PCIDevice *pci_dev, Error **errp) ct3d->cxl_cstate.pdev = pci_dev; build_dvsecs(ct3d); + regs->special_ops = g_new0(MemoryRegionOps, 1); + regs->special_ops->write = ct3d_reg_write; + cxl_component_register_block_init(OBJECT(pci_dev), cxl_cstate, TYPE_CXL_TYPE3_DEV); -- 2.30.0
next prev parent reply other threads:[~2021-02-02 1:01 UTC|newest] Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-02 0:59 [RFC PATCH v3 00/31] CXL 2.0 Support Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 01/31] hw/pci/cxl: Add a CXL component type (interface) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 02/31] hw/cxl/component: Introduce CXL components (8.1.x, 8.2.5) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 11:48 ` Jonathan Cameron 2021-02-02 11:48 ` Jonathan Cameron 2021-02-17 18:36 ` Ben Widawsky 2021-02-11 17:08 ` Jonathan Cameron 2021-02-11 17:08 ` Jonathan Cameron 2021-02-17 16:40 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 03/31] hw/cxl/device: Introduce a CXL device (8.2.8) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 12:03 ` Jonathan Cameron 2021-02-02 12:03 ` Jonathan Cameron 2021-02-02 0:59 ` [RFC PATCH v3 04/31] hw/cxl/device: Implement the CAP array (8.2.8.1-2) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 12:23 ` Jonathan Cameron 2021-02-02 12:23 ` Jonathan Cameron 2021-02-17 22:15 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 05/31] hw/cxl/device: Implement basic mailbox (8.2.8.4) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 14:58 ` Jonathan Cameron 2021-02-02 14:58 ` Jonathan Cameron 2021-02-11 17:46 ` Jonathan Cameron 2021-02-18 0:55 ` Ben Widawsky 2021-02-18 16:50 ` Jonathan Cameron 2021-02-11 18:09 ` Jonathan Cameron 2021-02-11 18:09 ` Jonathan Cameron 2021-02-02 0:59 ` [RFC PATCH v3 06/31] hw/cxl/device: Add memory device utilities Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 07/31] hw/cxl/device: Add cheap EVENTS implementation (8.2.9.1) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 13:44 ` Jonathan Cameron 2021-02-02 13:44 ` Jonathan Cameron 2021-02-11 17:59 ` Jonathan Cameron 2021-02-11 17:59 ` Jonathan Cameron 2021-02-02 0:59 ` [RFC PATCH v3 08/31] hw/cxl/device: Timestamp implementation (8.2.9.3) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 09/31] hw/cxl/device: Add log commands (8.2.9.4) + CEL Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 10/31] hw/pxb: Use a type for realizing expanders Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 13:50 ` Jonathan Cameron 2021-02-02 13:50 ` Jonathan Cameron 2021-02-02 0:59 ` [RFC PATCH v3 11/31] hw/pci/cxl: Create a CXL bus type Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 12/31] hw/pxb: Allow creation of a CXL PXB (host bridge) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 13/31] qtest: allow DSDT acpi table changes Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 14/31] acpi/pci: Consolidate host bridge setup Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 13:56 ` Jonathan Cameron 2021-02-02 13:56 ` Jonathan Cameron 2021-12-02 10:32 ` Jonathan Cameron 2021-12-02 10:32 ` Jonathan Cameron via 2021-02-02 0:59 ` [RFC PATCH v3 15/31] tests/acpi: remove stale allowed tables Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 16/31] hw/pci: Plumb _UID through host bridges Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 15:00 ` Jonathan Cameron 2021-02-02 15:00 ` Jonathan Cameron 2021-02-02 15:24 ` Michael S. Tsirkin 2021-02-02 15:24 ` Michael S. Tsirkin 2021-02-02 15:42 ` Ben Widawsky 2021-02-02 15:42 ` Ben Widawsky 2021-02-02 15:51 ` Michael S. Tsirkin 2021-02-02 15:51 ` Michael S. Tsirkin 2021-02-02 16:20 ` Ben Widawsky 2021-02-02 16:20 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 17/31] hw/cxl/component: Implement host bridge MMIO (8.2.5, table 142) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 19:21 ` Jonathan Cameron 2021-02-02 19:21 ` Jonathan Cameron 2021-02-02 19:45 ` Ben Widawsky 2021-02-02 20:43 ` Jonathan Cameron 2021-02-02 21:03 ` Ben Widawsky 2021-02-02 22:06 ` Jonathan Cameron 2021-02-02 0:59 ` [RFC PATCH v3 18/31] acpi/pxb/cxl: Reserve host bridge MMIO Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 19/31] hw/pxb/cxl: Add "windows" for host bridges Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 20/31] hw/cxl/rp: Add a root port Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 21/31] hw/cxl/device: Add a memory device (8.2.8.5) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 14:26 ` Eric Blake 2021-02-02 15:06 ` Ben Widawsky 2021-02-02 15:06 ` Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky [this message] 2021-02-02 0:59 ` [RFC PATCH v3 22/31] hw/cxl/device: Implement MMIO HDM decoding (8.2.5.12) Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 23/31] acpi/cxl: Add _OSC implementation (9.14.2) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 24/31] tests/acpi: allow CEDT table addition Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 25/31] acpi/cxl: Create the CEDT (9.14.1) Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 26/31] tests/acpi: Add new CEDT files Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 27/31] hw/cxl/device: Add some trivial commands Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 28/31] hw/cxl/device: Plumb real LSA sizing Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 29/31] hw/cxl/device: Implement get/set LSA Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 30/31] qtest/cxl: Add very basic sanity tests Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 0:59 ` [RFC PATCH v3 31/31] WIP: i386/cxl: Initialize a host bridge Ben Widawsky 2021-02-02 0:59 ` Ben Widawsky 2021-02-02 1:33 ` [RFC PATCH v3 00/31] CXL 2.0 Support no-reply 2021-02-02 1:33 ` no-reply 2021-02-03 17:42 ` Ben Widawsky 2021-02-11 18:51 ` Jonathan Cameron 2021-02-11 18:51 ` Jonathan Cameron 2021-03-11 23:27 ` [RFC PATCH] hw/mem/cxl_type3: Go back to subregions Ben Widawsky
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