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Message-ID: <b70cec19-0b9f-91e3-6444-9d63038b142a@amd.com>
Date: Thu, 1 Sep 2022 17:06:12 -0700
From: Tanmay Shah <tanmays@....com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>,
Tanmay Shah <tanmay.shah@....com>
Cc: bjorn.andersson@...aro.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, michal.simek@...inx.com,
ben.levinsky@...inx.com, tanmay.shah@...inx.com,
michal.simek@....com, linux-remoteproc@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v9 6/6] drivers: remoteproc: Add Xilinx r5 remoteproc
driver
On 9/1/22 1:25 PM, Mathieu Poirier wrote:
> On Thu, Jul 07, 2022 at 06:39:55PM -0700, Tanmay Shah wrote:
>> From: Tanmay Shah <tanmay.shah@...inx.com>
>>
>> This driver enables r5f dual core Real time Processing Unit subsystem
>> available on Xilinx Zynq Ultrascale MPSoC Platform. RPU subsystem
>> (cluster) can be configured in different modes e.g. split mode in which
>> two r5f cores work independent of each other and lock-step mode in which
>> both r5f cores execute same code clock-for-clock and notify if the
>> result is different.
>>
>> The Xilinx r5 Remoteproc Driver boots the RPU cores via calls to the Xilinx
>> Platform Management Unit that handles the R5 configuration, memory access
>> and R5 lifecycle management. The interface to this manager is done in this
>> driver via zynqmp_pm_* function calls.
>>
>> Signed-off-by: Ben Levinsky <ben.levinsky@...inx.com>
>> Signed-off-by: Tanmay Shah <tanmay.shah@...inx.com>
>> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
>> ---
>>
>> Changes in v9
>> - replace devm_rproc_alloc with rproc_alloc
>> - %s/until/while/r
>> - remove extra line
>> - %s/i > -1/i >=0/r fix this throughout the driver
>> - fix type of tcm_mode from int to enum rpu_tcm_comb
>> - release &child_pdev->dev references in case of failure
>> - remove zynqmp_r5_core_exit()
>> - undefined memory-region property isn't driver failure
>> - remove tcm bank count check from ops
>> - fix tcm bank turn-off sequence
>> - fix parse_fw function documentation
>> - do not use rproc_mem_entry_init on vdev0buffers
>> - declare variabls in reverse xmas tree order throughout the driver
>>
>> Changes in v8:
>> - None
>>
>> Changes in v7:
>> - None
>>
>> Changes in v6:
>> - None
>>
>> Changes in v5:
>> - None
>>
>> Changes in v4:
>> - Remove redundant header files
>> - use dev_err_probe() to report errors during probe
>> - Fix missing check on error code returned by zynqmp_r5_add_rproc_core()
>> - Fix memory leaks all over the driver when resource allocation fails for any core
>> - make cluster mode check only at one place
>> - remove redundant initialization of variable
>> - remove redundant use of of_node_put()
>> - Fix Comment format problem
>> - Assign offset of zynqmp_tcm_banks instead of duplicating it
>> - Add tcm and memory regions rproc carveouts during prepare instead of parse_fw
>> - Remove rproc_mem_entry object from r5_core
>> - Use put_device() and rproc_del() APIs to fix memory leaks
>> - Replace pr_* with dev_*. This was missed in v3, fix now.
>> - Use "GPL" instead of "GPL v2" in MODULE_LICENSE macro. This was suggested by checkpatch script.
>>
>> Changes in v3:
>> - Fix checkpatch script indentation warning
>> - Remove unused variable from xilinx remoteproc driver
>> - use C style comments, i.e /*...*/
>> - Remove redundant debug information which can be derived using /proc/device-tree
>> - Fix multilined comment format
>> - s/"final fot TCM"/"final for TCM"
>> - Function devm_kzalloc() does not return an code on error, just NULL.
>> Remove redundant error check for this function throughout the driver.
>> - Fix RPU mode configuration and add documentation accordingly
>> - Get rid of the indentations to match function documentation style with rest of the driver
>> - Fix memory leak by only using r5_rproc->priv and not replace it with new instance
>> - Use 'i' for the outer loop and 'j' for the inner one as per convention
>> - Remove redundant error and NULL checks throughout the driver
>> - Use devm_kcalloc() when more than one element is required
>> - Add memory-regions carveouts during driver probe instead of parse_fw call
>> This removes redundant copy of reserved_mem object in r5_core structure.
>> - Fix memory leak by using of_node_put()
>> - Fix indentation of tcm_mem_map function args
>> - Remove redundant init of variables
>> - Initialize tcm bank size variable for lockstep mode
>> - Replace u32 with phys_addr_t for variable stroing memory bank address
>> - Add documentation of TCM behavior in lockstep mode
>> - Use dev_get_drvdata instead of platform driver API
>> - Remove info level messages
>> - Fix checkpatch.pl warnings
>> - Add documentation for the Xilinx r5f platform to understand driver design
>> drivers/remoteproc/Kconfig | 12 +
>> drivers/remoteproc/Makefile | 1 +
>> drivers/remoteproc/xlnx_r5_remoteproc.c | 1055 +++++++++++++++++++++++
>> 3 files changed, 1068 insertions(+)
>> create mode 100644 drivers/remoteproc/xlnx_r5_remoteproc.c
>>
>> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
>> index 166019786653..5637a71c0677 100644
>> --- a/drivers/remoteproc/Kconfig
>> +++ b/drivers/remoteproc/Kconfig
>> @@ -352,6 +352,18 @@ config TI_K3_R5_REMOTEPROC
>> It's safe to say N here if you're not interested in utilizing
>> a slave processor.
>>
>> +config XLNX_R5_REMOTEPROC
>> + tristate "Xilinx R5 remoteproc support"
>> + depends on PM && ARCH_ZYNQMP
>> + depends on ZYNQMP_FIRMWARE
>> + select RPMSG_VIRTIO
>> + select ZYNQMP_IPI_MBOX
>> + help
>> + Say y or m here to support Xilinx R5 remote processors via the remote
>> + processor framework.
>> +
>> + It's safe to say N if not interested in using RPU r5f cores.
>> +
>> endif # REMOTEPROC
>>
>> endmenu
>> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
>> index 5478c7cb9e07..91314a9b43ce 100644
>> --- a/drivers/remoteproc/Makefile
>> +++ b/drivers/remoteproc/Makefile
>> @@ -38,3 +38,4 @@ obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
>> obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
>> obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
>> obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o
>> +obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o
>> diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
>> new file mode 100644
>> index 000000000000..9865b51e0356
>> --- /dev/null
>> +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
>> @@ -0,0 +1,1055 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * ZynqMP R5 Remote Processor driver
>> + *
>> + */
>> +
>> +#include <dt-bindings/power/xlnx-zynqmp-power.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/firmware/xlnx-zynqmp.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/of_reserved_mem.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/remoteproc.h>
>> +#include <linux/slab.h>
>> +
>> +#include "remoteproc_internal.h"
>> +
>> +/* settings for RPU cluster mode */
>> +enum zynqmp_r5_cluster_mode {
>> + SPLIT_MODE = 0, /* When cores run as separate processor */
>> + LOCKSTEP_MODE = 1, /* cores execute same code in lockstep,clk-for-clk */
>> + SINGLE_CPU_MODE = 2, /* core0 is held in reset and only core1 runs */
>> +};
>> +
>> +/**
>> + * struct mem_bank_data - Memory Bank description
>> + *
>> + * @addr: Start address of memory bank
>> + * @size: Size of Memory bank
>> + * @pm_domain_id: Power-domains id of memory bank for firmware to turn on/off
>> + * @bank_name: name of the bank for remoteproc framework
>> + */
>> +struct mem_bank_data {
>> + phys_addr_t addr;
>> + size_t size;
>> + u32 pm_domain_id;
>> + char *bank_name;
>> +};
>> +
>> +static const struct mem_bank_data zynqmp_tcm_banks[] = {
>> + {0xffe00000UL, 0x10000UL, PD_R5_0_ATCM, "atcm0"}, /* TCM 64KB each */
>> + {0xffe20000UL, 0x10000UL, PD_R5_0_BTCM, "btcm0"},
>> + {0xffe90000UL, 0x10000UL, PD_R5_1_ATCM, "atcm1"},
>> + {0xffeb0000UL, 0x10000UL, PD_R5_1_BTCM, "btcm1"},
>> +};
>> +
>> +/**
>> + * struct zynqmp_r5_core - ZynqMP R5 core structure
>> + *
>> + * @dev: device of RPU instance
>> + * @np: device node of RPU instance
>> + * @tcm_bank_count: number TCM banks accessible to this RPU
>> + * @tcm_banks: array of each TCM bank data
>> + * @rmem_count: Number of reserved mem regions
>> + * @rmem: reserved memory region nodes from device tree
>> + * @rproc: rproc handle
>> + * @pm_domain_id: RPU CPU power domain id
>> + */
>> +struct zynqmp_r5_core {
>> + struct device *dev;
>> + struct device_node *np;
>> + int tcm_bank_count;
>> + struct mem_bank_data **tcm_banks;
>> + int rmem_count;
>> + struct reserved_mem **rmem;
>> + struct rproc *rproc;
>> + u32 pm_domain_id;
>> +};
>> +
>> +/**
>> + * struct zynqmp_r5_cluster - ZynqMP R5 cluster structure
>> + *
>> + * @dev: r5f subsystem cluster device node
>> + * @mode: cluster mode of type zynqmp_r5_cluster_mode
>> + * @core_count: number of r5 cores used for this cluster mode
>> + * @r5_cores: Array of pointers pointing to r5 core
>> + */
>> +struct zynqmp_r5_cluster {
>> + struct device *dev;
>> + enum zynqmp_r5_cluster_mode mode;
>> + int core_count;
>> + struct zynqmp_r5_core **r5_cores;
>> +};
>> +
>> +/*
>> + * zynqmp_r5_set_mode - set RPU operation mode
>> + *
>> + * set RPU operation mode
>> + *
>> + * Return: 0 for success, negative value for failure
>> + */
>> +static int zynqmp_r5_set_mode(struct zynqmp_r5_core *r5_core,
>> + enum rpu_oper_mode fw_reg_val,
>> + enum rpu_tcm_comb tcm_mode)
>> +{
>> + int ret;
>> +
>> + ret = zynqmp_pm_set_rpu_mode(r5_core->pm_domain_id, fw_reg_val);
>> + if (ret < 0) {
>> + dev_err(r5_core->dev, "failed to set RPU mode\n");
>> + return ret;
>> + }
>> +
>> + ret = zynqmp_pm_set_tcm_config(r5_core->pm_domain_id, tcm_mode);
>> + if (ret < 0)
>> + dev_err(r5_core->dev, "failed to configure TCM\n");
>> +
>> + return ret;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_rproc_start
>> + * @rproc: single R5 core's corresponding rproc instance
>> + *
>> + * Start R5 Core from designated boot address.
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int zynqmp_r5_rproc_start(struct rproc *rproc)
>> +{
>> + struct zynqmp_r5_core *r5_core = rproc->priv;
>> + enum rpu_boot_mem bootmem;
>> + int ret;
>> +
>> + /*
>> + * The exception vector pointers (EVP) refer to the base-address of
>> + * exception vectors (for reset, IRQ, FIQ, etc). The reset-vector
>> + * starts at the base-address and subsequent vectors are on 4-byte
>> + * boundaries.
>> + *
>> + * Exception vectors can start either from 0x0000_0000 (LOVEC) or
>> + * from 0xFFFF_0000 (HIVEC) which is mapped in the OCM (On-Chip Memory)
>> + *
>> + * Usually firmware will put Exception vectors at LOVEC.
>> + *
>> + * It is not recommend that you change the exception vector.
>> + * Changing the EVP to HIVEC will result in increased interrupt latency
>> + * and jitter. Also, if the OCM is secured and the Cortex-R5F processor
>> + * is non-secured, then the Cortex-R5F processor cannot access the
>> + * HIVEC exception vectors in the OCM.
>> + */
>> + bootmem = (rproc->bootaddr >= 0xFFFC0000) ?
>> + PM_RPU_BOOTMEM_HIVEC : PM_RPU_BOOTMEM_LOVEC;
>> +
>> + dev_dbg(r5_core->dev, "RPU boot addr 0x%llx from %s.", rproc->bootaddr,
>> + bootmem == PM_RPU_BOOTMEM_HIVEC ? "OCM" : "TCM");
>> +
>> + ret = zynqmp_pm_request_wake(r5_core->pm_domain_id, 1,
>> + bootmem, ZYNQMP_PM_REQUEST_ACK_NO);
>> + if (ret)
>> + dev_err(r5_core->dev,
>> + "failed to start RPU = 0x%x\n", r5_core->pm_domain_id);
>> + return ret;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_rproc_stop
>> + * @rproc: single R5 core's corresponding rproc instance
>> + *
>> + * Power down R5 Core.
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int zynqmp_r5_rproc_stop(struct rproc *rproc)
>> +{
>> + struct zynqmp_r5_core *r5_core = rproc->priv;
>> + int ret;
>> +
>> + ret = zynqmp_pm_force_pwrdwn(r5_core->pm_domain_id,
>> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
>> + if (ret)
>> + dev_err(r5_core->dev, "failed to stop remoteproc RPU %d\n", ret);
>> +
>> + return ret;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_mem_region_map
>> + * @rproc: single R5 core's corresponding rproc instance
>> + * @mem: mem entry to map
>> + *
>> + * Callback to map va for memory-region's carveout.
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int zynqmp_r5_mem_region_map(struct rproc *rproc,
>> + struct rproc_mem_entry *mem)
>> +{
>> + void __iomem *va;
>> +
>> + va = ioremap_wc(mem->dma, mem->len);
>> + if (IS_ERR_OR_NULL(va))
>> + return -ENOMEM;
>> +
>> + mem->va = (void *)va;
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_rproc_mem_unmap
>> + * @rproc: single R5 core's corresponding rproc instance
>> + * @mem: mem entry to unmap
>> + *
>> + * Unmap memory-region carveout
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int zynqmp_r5_mem_region_unmap(struct rproc *rproc,
>> + struct rproc_mem_entry *mem)
>> +{
>> + iounmap((void __iomem *)mem->va);
>> + return 0;
>> +}
>> +
>> +/*
>> + * add_mem_regions
>> + * @r5_core: single R5 core's corresponding zynqmp_r5_core type instance
>> + * @rmem: reserved mem region parsed from dt node
>> + *
>> + * Construct rproc mem carveouts from carveout provided in
>> + * memory-region property
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int add_mem_regions_carveout(struct rproc *rproc)
>> +{
>> + struct rproc_mem_entry **rproc_mem;
>> + struct zynqmp_r5_core *r5_core;
>> + struct reserved_mem *rmem;
>> + int i, num_mem_regions;
>> +
>> + r5_core = (struct zynqmp_r5_core *)rproc->priv;
>> + num_mem_regions = r5_core->rmem_count;
>> +
>> + /* memory regions not defined */
>> + if (num_mem_regions < 1)
>> + return 0;
>> +
>> + rproc_mem = kcalloc(num_mem_regions,
>> + sizeof(struct rproc_mem_entry *), GFP_KERNEL);
>> + if (!rproc_mem)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < num_mem_regions; i++) {
>> + rmem = r5_core->rmem[i];
>> +
>> + if (!strncmp(rmem->name, "vdev0buffer", strlen("vdev0buffer"))) {
>> + /* Register reserved memory for vdev buffer */
>> + rproc_mem[i] = rproc_of_resm_mem_entry_init(&rproc->dev, i,
>> + rmem->size,
>> + rmem->base,
>> + rmem->name);
>> + } else {
>> + /* Register associated reserved memory regions */
>> + rproc_mem[i] = rproc_mem_entry_init(&rproc->dev, NULL,
>> + (dma_addr_t)rmem->base,
>> + rmem->size, rmem->base,
>> + zynqmp_r5_mem_region_map,
>> + zynqmp_r5_mem_region_unmap,
>> + rmem->name);
>> + }
>> +
>> + if (!rproc_mem[i])
>> + goto release_mem_regions;
>> +
>> + dev_dbg(&rproc->dev, "reserved mem carveout %s addr=%llx, size=0x%llx",
>> + rmem->name, rmem->base, rmem->size);
>> + }
>> +
>> + /*
>> + * Add carveouts only if all rproc mem enties are
>> + * successfully initialized
>> + */
>> + for (i = 0; i < num_mem_regions; i++)
>> + rproc_add_carveout(rproc, rproc_mem[i]);
>> +
>> + kfree(rproc_mem);
>> + return 0;
>> +
>> +release_mem_regions:
>> + for (i--; i >= 0; i--)
>> + kfree(rproc_mem[i]);
>> + kfree(rproc_mem);
>> + return -ENOMEM;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_rproc_mem_unmap
>> + * @rproc: single R5 core's corresponding rproc instance
>> + * @mem: mem entry to unmap
>> + *
>> + * Unmap TCM banks when powering down R5 core.
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int tcm_mem_unmap(struct rproc *rproc, struct rproc_mem_entry *mem)
>> +{
>> + iounmap((void __iomem *)mem->va);
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * tcm_mem_map
>> + * @rproc: single R5 core's corresponding rproc instance
>> + * @mem: mem entry to initialize the va and da fields of
>> + *
>> + * Given TCM bank entry, this callback will set device address for R5
>> + * running on TCM and also setup virtual address for TCM bank
>> + * remoteproc carveout.
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int tcm_mem_map(struct rproc *rproc,
>> + struct rproc_mem_entry *mem)
>> +{
>> + void __iomem *va;
>> +
>> + va = ioremap_wc(mem->dma, mem->len);
>> + if (IS_ERR_OR_NULL(va))
>> + return -ENOMEM;
>> +
>> + /* Update memory entry va */
>> + mem->va = (void *)va;
>> +
>> + /* clear TCMs */
>> + memset_io(va, 0, mem->len);
>> +
>> + /*
>> + * The R5s expect their TCM banks to be at address 0x0 and 0x2000,
>> + * while on the Linux side they are at 0xffexxxxx.
>> + *
>> + * Zero out the high 12 bits of the address. This will give
>> + * expected values for TCM Banks 0A and 0B (0x0 and 0x20000).
>> + */
>> + mem->da &= 0x000fffff;
>> +
>> + /*
>> + * TCM Banks 1A and 1B still have to be translated.
>> + *
>> + * Below handle these two banks' absolute addresses (0xffe90000 and
>> + * 0xffeb0000) and convert to the expected relative addresses
>> + * (0x0 and 0x20000).
>> + */
>> + if (mem->da == 0x90000 || mem->da == 0xB0000)
>> + mem->da -= 0x90000;
>> +
>> + /* if translated TCM bank address is not valid report error */
>> + if (mem->da != 0x0 && mem->da != 0x20000) {
>> + dev_err(&rproc->dev, "invalid TCM address: %x\n", mem->da);
>> + return -EINVAL;
>> + }
>> + return 0;
>> +}
>> +
>> +static int add_tcm_carveout_split_mode(struct rproc *rproc)
>> +{
>> + struct rproc_mem_entry **rproc_mem;
>> + struct zynqmp_r5_core *r5_core;
>> + int i, num_banks, ret;
>> + phys_addr_t bank_addr;
>> + struct device *dev;
>> + u32 pm_domain_id;
>> + size_t bank_size;
>> + char *bank_name;
>> +
>> + r5_core = (struct zynqmp_r5_core *)rproc->priv;
>> + dev = r5_core->dev;
>> + num_banks = r5_core->tcm_bank_count;
>> +
>> + rproc_mem = kcalloc(num_banks,
>> + sizeof(struct rproc_mem_entry *), GFP_KERNEL);
>> + if (!rproc_mem)
>> + return -ENOMEM;
>> +
>> + /*
>> + * Power-on Each 64KB TCM,
>> + * register its address space, map and unmap functions
>> + * and add carveouts accordingly
>> + */
>> + for (i = 0; i < num_banks; i++) {
>> + bank_addr = r5_core->tcm_banks[i]->addr;
>> + bank_name = r5_core->tcm_banks[i]->bank_name;
>> + bank_size = r5_core->tcm_banks[i]->size;
>> + pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
>> +
>> + ret = zynqmp_pm_request_node(pm_domain_id,
>> + ZYNQMP_PM_CAPABILITY_ACCESS, 0,
>> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to turn on TCM 0x%x", pm_domain_id);
>> + goto release_tcm_split;
>> + }
>> +
>> + dev_dbg(dev, "TCM carveout split mode %s addr=%llx, size=0x%lx",
>> + bank_name, bank_addr, bank_size);
>> +
>> + rproc_mem[i] = rproc_mem_entry_init(dev, NULL, bank_addr,
>> + bank_size, bank_addr,
>> + tcm_mem_map, tcm_mem_unmap,
>> + bank_name);
>> + if (!rproc_mem[i]) {
>> + ret = -ENOMEM;
>> + zynqmp_pm_release_node(pm_domain_id);
>> + goto release_tcm_split;
>> + }
>> + }
>> +
>> + /*
>> + * Add carveouts only if all rproc mem enties are
>> + * successfully initialized
>> + */
>> + for (i = 0; i < num_banks; i++)
>> + rproc_add_carveout(rproc, rproc_mem[i]);
>> +
>> + kfree(rproc_mem);
>> + return 0;
>> +
>> +release_tcm_split:
>> + /* If failed, Turn off all TCM banks turned on before */
>> + for (i--; i >= 0; i--) {
>> + pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
>> + zynqmp_pm_release_node(pm_domain_id);
>> + kfree(rproc_mem[i]);
>> + }
>> + kfree(rproc_mem);
>> + return ret;
>> +}
>> +
>> +static int add_tcm_carveout_lockstep_mode(struct rproc *rproc)
>> +{
>> + struct rproc_mem_entry *rproc_mem;
>> + struct zynqmp_r5_core *r5_core;
>> + int i, num_banks, ret;
>> + phys_addr_t bank_addr;
>> + size_t bank_size = 0;
>> + struct device *dev;
>> + u32 pm_domain_id;
>> + char *bank_name;
>> +
>> + r5_core = (struct zynqmp_r5_core *)rproc->priv;
>> + dev = r5_core->dev;
>> +
>> + /* Go through zynqmp banks for r5 node */
>> + num_banks = r5_core->tcm_bank_count;
>> +
>> + /*
>> + * In lockstep mode, TCM is contiguous memory block
>> + * However, each TCM block still needs to be enabled individually.
>> + * So, Enable each TCM block individually, but add their size
>> + * to create contiguous memory region.
>> + */
>> + bank_addr = r5_core->tcm_banks[0]->addr;
>> + bank_name = r5_core->tcm_banks[0]->bank_name;
>> +
>> + for (i = 0; i < num_banks; i++) {
>> + bank_size += r5_core->tcm_banks[i]->size;
>> + pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
>> +
>> + /* Turn on each TCM bank individually */
>> + ret = zynqmp_pm_request_node(pm_domain_id,
>> + ZYNQMP_PM_CAPABILITY_ACCESS, 0,
>> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to turn on TCM 0x%x", pm_domain_id);
>> + goto release_tcm_lockstep;
>> + }
>> + }
>> +
>> + dev_dbg(dev, "TCM add carveout lockstep mode %s addr=0x%llx, size=0x%lx",
>> + bank_name, bank_addr, bank_size);
>> +
>> + /* Register TCM address range, TCM map and unmap functions */
>> + rproc_mem = rproc_mem_entry_init(dev, NULL, bank_addr,
>> + bank_size, bank_addr,
>> + tcm_mem_map, tcm_mem_unmap,
>> + bank_name);
>> + if (!rproc_mem) {
>> + ret = -ENOMEM;
>> + goto release_tcm_lockstep;
>> + }
>> +
>> + /* If registration is success, add carveouts */
>> + rproc_add_carveout(rproc, rproc_mem);
>> +
>> + return 0;
>> +
>> +release_tcm_lockstep:
>> + /* If failed, Turn off all TCM banks turned on before */
>> + for (i--; i >= 0; i--) {
>> + pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
>> + zynqmp_pm_release_node(pm_domain_id);
>> + }
>> + return ret;
>> +}
>> +
>> +/*
>> + * add_tcm_banks()
>> + * @rproc: single R5 core's corresponding rproc instance
>> + *
>> + * Given R5 node in remoteproc instance
>> + * allocate remoteproc carveout for TCM memory
>> + * needed for firmware to be loaded
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int add_tcm_banks(struct rproc *rproc)
>> +{
>> + struct zynqmp_r5_cluster *cluster;
>> + struct zynqmp_r5_core *r5_core;
>> + struct device *dev;
>> +
>> + r5_core = (struct zynqmp_r5_core *)rproc->priv;
>> + if (!r5_core)
>> + return -EINVAL;
>> +
>> + dev = r5_core->dev;
>> +
>> + cluster = dev_get_drvdata(dev->parent);
>> + if (!cluster) {
>> + dev_err(dev->parent, "Invalid driver data\n");
>> + return -EINVAL;
>> + }
>> +
>> + /*
>> + * In lockstep mode TCM banks are one contiguous memory region of 256Kb
>> + * In split mode, each TCM bank is 64Kb and not contiguous.
>> + * We add memory carveouts accordingly.
>> + */
>> + if (cluster->mode == SPLIT_MODE)
>> + return add_tcm_carveout_split_mode(rproc);
>> + else if (cluster->mode == LOCKSTEP_MODE)
>> + return add_tcm_carveout_lockstep_mode(rproc);
>> +
>> + dev_err(cluster->dev, "invalid cluster mode\n");
>> + return -EINVAL;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_parse_fw()
>> + * @rproc: single R5 core's corresponding rproc instance
>> + * @fw: ptr to firmware to be loaded onto r5 core
>> + *
>> + * get resource table if available
>> + *
>> + * return 0 on success, otherwise non-zero value on failure
>> + */
>> +static int zynqmp_r5_parse_fw(struct rproc *rproc, const struct firmware *fw)
>> +{
>> + int ret;
>> +
>> + ret = rproc_elf_load_rsc_table(rproc, fw);
>> + if (ret == -EINVAL) {
>> + /*
>> + * resource table only required for IPC.
>> + * if not present, this is not necessarily an error;
>> + * for example, loading r5 hello world application
>> + * so simply inform user and keep going.
>> + */
>> + dev_info(&rproc->dev, "no resource table found.\n");
>> + ret = 0;
>> + }
>> + return ret;
>> +}
>> +
>> +static int zynqmp_r5_rproc_prepare(struct rproc *rproc)
>> +{
>> + int ret;
>> +
>> + ret = add_tcm_banks(rproc);
>> + if (ret) {
>> + dev_err(&rproc->dev, "failed to get TCM banks, err %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = add_mem_regions_carveout(rproc);
>> + if (ret)
>> + dev_warn(&rproc->dev, "failed to get reserve mem regions %d\n",
>> + ret);
>> +
>> + return 0;
>> +}
>> +
>> +static int zynqmp_r5_rproc_unprepare(struct rproc *rproc)
>> +{
>> + struct zynqmp_r5_core *r5_core;
>> + u32 pm_domain_id;
>> + int i;
>> +
>> + r5_core = (struct zynqmp_r5_core *)rproc->priv;
>> +
>> + for (i = 0; i < r5_core->tcm_bank_count; i++) {
>> + pm_domain_id = r5_core->tcm_banks[i]->pm_domain_id;
>> + if (zynqmp_pm_release_node(pm_domain_id))
>> + dev_warn(r5_core->dev,
>> + "can't turn off TCM bank 0x%x", pm_domain_id);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct rproc_ops zynqmp_r5_rproc_ops = {
>> + .prepare = zynqmp_r5_rproc_prepare,
>> + .unprepare = zynqmp_r5_rproc_unprepare,
>> + .start = zynqmp_r5_rproc_start,
>> + .stop = zynqmp_r5_rproc_stop,
>> + .load = rproc_elf_load_segments,
>> + .parse_fw = zynqmp_r5_parse_fw,
>> + .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
>> + .sanity_check = rproc_elf_sanity_check,
>> + .get_boot_addr = rproc_elf_get_boot_addr,
>> +};
>> +
>> +/**
>> + * zynqmp_r5_add_rproc_core()
>> + * Probes ZynqMP R5 processor device node
>> + * this is called for each individual R5 core
>> + *
>> + * @cdev: Device node of each r5 core
>> + *
>> + * Return: zynqmp_r5_core object for success, error pointer in case of error.
>> + */
>> +static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
>> +{
>> + struct zynqmp_r5_core *r5_core;
>> + struct rproc *r5_rproc;
>> + int ret;
>> +
>> + /* Set up DMA mask */
>> + ret = dma_set_coherent_mask(cdev, DMA_BIT_MASK(32));
>> + if (ret)
>> + return ERR_PTR(ret);
>> +
>> + /* Allocate remoteproc instance */
>> + r5_rproc = rproc_alloc(cdev, dev_name(cdev),
>> + &zynqmp_r5_rproc_ops,
>> + NULL, sizeof(struct zynqmp_r5_core));
>> + if (!r5_rproc) {
>> + dev_err(cdev, "failed to allocate memory for rproc instance\n");
>> + return ERR_PTR(-ENOMEM);
>> + }
>> +
>> + r5_rproc->auto_boot = false;
>> + r5_core = (struct zynqmp_r5_core *)r5_rproc->priv;
>> + r5_core->dev = cdev;
>> + r5_core->np = dev_of_node(cdev);
>> + if (!r5_core->np) {
>> + dev_err(cdev, "can't get device node for r5 core\n");
>> + return ERR_PTR(-EINVAL);
> Here @r5_rproc is leaked and r5_rproc->rproc never free'ed.
>
>> + }
>> +
>> + /* Add R5 remoteproc core */
>> + ret = rproc_add(r5_rproc);
>> + if (ret) {
>> + dev_err(cdev, "failed to add r5 remoteproc\n");
>> + return ERR_PTR(ret);
> Same.
>
>> + }
>> +
>> + r5_core->rproc = r5_rproc;
>> + return r5_core;
>> +}
>> +
>> +/**
>> + * zynqmp_r5_get_tcm_node()
>> + * Ideally this function should parse tcm node and store information
>> + * in r5_core instance. We will use hardcoded TCM information from
>> + * driver for now in this function.
>> + *
> It would be a good idea to explain _why_ hardcoded values are used.
>
>
>> + * @cluster: pointer to zynqmp_r5_cluster type object
>> + *
>> + * Return: 0 for success and error code for failure.
>> + */
>> +static int zynqmp_r5_get_tcm_node(struct zynqmp_r5_cluster *cluster)
>> +{
>> + struct device *dev = cluster->dev;
>> + struct zynqmp_r5_core *r5_core;
>> + int tcm_bank_count, tcm_node;
>> + int i, j;
>> +
>> + /*
>> + * ToDo: Use predefined TCM address space values from driver while
> I'm not sure why there is a "ToDo" here since this is exactly what you are
> doing.
>
>> + * system-dt spec is not final for TCM
>> + */
>> + tcm_bank_count = ARRAY_SIZE(zynqmp_tcm_banks);
>> +
>> + /* count per core tcm banks */
>> + tcm_bank_count = tcm_bank_count / cluster->core_count;
>> +
>> + if (tcm_bank_count <= 0)
>> + return -EINVAL;
> As far as I can tell this can't happen and as such should be removed.
>
>> +
>> + /*
>> + * r5 core 0 will use all of TCM banks in lockstep mode.
>> + * In split mode, r5 core0 will use 128k and r5 core1 will use another
>> + * 128k. Assign TCM banks to each core accordingly
>> + */
>> + tcm_node = 0;
>> + for (i = 0; i < cluster->core_count; i++) {
>> + r5_core = cluster->r5_cores[i];
>> + r5_core->tcm_banks = devm_kcalloc(dev, tcm_bank_count,
>> + sizeof(struct mem_bank_data *),
>> + GFP_KERNEL);
>> + if (!r5_core->tcm_banks)
>> + return -ENOMEM;
>> +
>> + for (j = 0; j < tcm_bank_count; j++) {
>> + /*
>> + * Use pre-defined TCM reg values.
>> + * Eventually this should be replaced by values
>> + * parsed from dts.
>> + */
>> + r5_core->tcm_banks[j] =
>> + (struct mem_bank_data *)&zynqmp_tcm_banks[tcm_node];
>> + tcm_node++;
>> + }
>> +
>> + r5_core->tcm_bank_count = tcm_bank_count;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/**
>> + * zynqmp_r5_get_mem_region_node()
>> + * parse memory-region property from dt node and add
>> + * memory region carveouts
>> + *
>> + * @r5_core: pointer to zynqmp_r5_core type object
>> + *
>> + * Return: 0 for success and error code for failure.
>> + */
>> +static int zynqmp_r5_get_mem_region_node(struct zynqmp_r5_core *r5_core)
>> +{
>> + struct device_node *np, *rmem_np;
>> + struct reserved_mem **rmem;
>> + int res_mem_count, i;
>> + struct device *dev;
>> +
>> + dev = r5_core->dev;
>> + np = r5_core->np;
>> +
>> + res_mem_count = of_property_count_elems_of_size(np, "memory-region",
>> + sizeof(phandle));
>> + if (res_mem_count <= 0) {
>> + dev_warn(dev, "failed to get memory-region property %d\n",
>> + res_mem_count);
>> + r5_core->rmem_count = 0;
>> + return 0;
>> + }
>> +
>> + rmem = devm_kcalloc(dev, res_mem_count,
>> + sizeof(struct reserved_mem *), GFP_KERNEL);
>> + if (!rmem)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < res_mem_count; i++) {
>> + rmem_np = of_parse_phandle(np, "memory-region", i);
>> + if (!rmem_np)
>> + goto release_rmem;
>> +
>> + rmem[i] = of_reserved_mem_lookup(rmem_np);
>> + if (!rmem[i]) {
>> + of_node_put(rmem_np);
>> + goto release_rmem;
>> + }
>> +
>> + of_node_put(rmem_np);
>> + }
>> +
>> + r5_core->rmem_count = res_mem_count;
>> + r5_core->rmem = rmem;
>> + return 0;
>> +
>> +release_rmem:
>> + for (i--; i >= 0; i--)
>> + kfree(rmem[i]);
> Function of_reserved_mem_lookup() doesn't allocate a new reserved_mem structure,
> you get a reference to an existing one. As such there is no need to explicitly
> free individual elements of the rmem array.
>
>> + devm_kfree(dev, rmem);
>> + return -ENOMEM;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_core_init()
>> + * Create and initialize zynqmp_r5_core type object
>> + *
>> + * @cluster: pointer to zynqmp_r5_cluster type object
>> + *
>> + * Return: 0 for success and error code for failure.
>> + */
>> +static int zynqmp_r5_core_init(struct zynqmp_r5_cluster *cluster,
>> + enum rpu_oper_mode fw_reg_val,
>> + enum rpu_tcm_comb tcm_mode)
>> +{
>> + struct device *dev = cluster->dev;
>> + struct zynqmp_r5_core *r5_core;
>> + int ret, i;
>> +
>> + ret = zynqmp_r5_get_tcm_node(cluster);
>> + if (ret < 0) {
>> + dev_err(dev, "can't get tcm node, err %d\n", ret);
>> + return ret;
>> + }
>> +
>> + for (i = 0; i < cluster->core_count; i++) {
>> + r5_core = cluster->r5_cores[i];
>> +
>> + ret = zynqmp_r5_get_mem_region_node(r5_core);
>> + if (ret)
>> + dev_warn(dev, "memory-region prop failed %d\n", ret);
>> +
>> + /* Initialize r5 cores with power-domains parsed from dts */
>> + ret = of_property_read_u32_index(r5_core->np, "power-domains",
>> + 1, &r5_core->pm_domain_id);
>> + if (ret) {
>> + dev_err(dev, "failed to get power-domains property\n");
>> + return ret;
>> + }
>> +
>> + ret = zynqmp_r5_set_mode(r5_core, fw_reg_val, tcm_mode);
>> + if (ret) {
>> + dev_err(dev, "failed to set r5 cluster mode %d, err %d\n",
>> + cluster->mode, ret);
>> + return ret;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * zynqmp_r5_cluster_init()
>> + * Create and initialize zynqmp_r5_cluster type object
>> + *
>> + * @cluster: pointer to zynqmp_r5_cluster type object
>> + *
>> + * Return: 0 for success and error code for failure.
>> + */
>> +static int zynqmp_r5_cluster_init(struct zynqmp_r5_cluster *cluster)
>> +{
>> + enum zynqmp_r5_cluster_mode cluster_mode = LOCKSTEP_MODE;
>> + struct device *dev = cluster->dev;
>> + struct device_node *dev_node = dev_of_node(dev);
>> + struct platform_device *child_pdev;
>> + struct zynqmp_r5_core **r5_cores;
>> + enum rpu_oper_mode fw_reg_val;
>> + struct device **child_devs;
>> + struct device_node *child;
>> + enum rpu_tcm_comb tcm_mode;
>> + int core_count, ret, i;
>> +
>> + ret = of_property_read_u32(dev_node, "xlnx,cluster-mode", &cluster_mode);
>> +
>> + /*
>> + * on success returns 0, if not defined then returns -EINVAL,
>> + * In that case, default is LOCKSTEP mode
>> + */
>> + if (ret != -EINVAL && ret != 0) {
>> + dev_err(dev, "Invalid xlnx,cluster-mode property\n");
>> + return -EINVAL;
>> + }
>> +
>> + /*
>> + * For now driver only supports split mode and lockstep mode.
>> + * fail driver probe if either of that is not set in dts.
>> + */
>> + if (cluster_mode == LOCKSTEP_MODE) {
> Why is are LOCKSTEP_MODE and LOCKSTEP_MODE defined when the same values were
> already added in xlnx-zynqmp.h in patch 3/6? And why not add SINGLE_CPU_MODE
> there as well instead of duplicating things in enum zynqmp_r5_cluster_mode?
>
>> + tcm_mode = PM_RPU_TCM_COMB;
>> + fw_reg_val = PM_RPU_MODE_LOCKSTEP;
>> + } else if (cluster_mode == SPLIT_MODE) {
>> + tcm_mode = PM_RPU_TCM_SPLIT;
>> + fw_reg_val = PM_RPU_MODE_SPLIT;
>> + } else {
>> + dev_err(dev, "driver does not support cluster mode %d\n", cluster_mode);
>> + return -EINVAL;
>> + }
>> +
>> + /*
>> + * Number of cores is decided by number of child nodes of
>> + * r5f subsystem node in dts. If Split mode is used in dts
>> + * 2 child nodes are expected.
>> + * In lockstep mode if two child nodes are available,
>> + * only use first child node and consider it as core0
>> + * and ignore core1 dt node.
>> + */
>> + core_count = of_get_available_child_count(dev_node);
>> + if (core_count <= 0) {
>> + dev_err(dev, "Invalid number of r5 cores %d", core_count);
>> + return -EINVAL;
>> + } else if (cluster_mode == SPLIT_MODE && core_count != 2) {
>> + dev_err(dev, "Invalid number of r5 cores for split mode\n");
>> + return -EINVAL;
>> + } else if (cluster_mode == LOCKSTEP_MODE && core_count == 2) {
>> + dev_warn(dev, "Only r5 core0 will be used\n");
>> + core_count = 1;
>> + }
>> +
>> + child_devs = kcalloc(core_count, sizeof(struct device *), GFP_KERNEL);
>> + if (!child_devs)
>> + return -ENOMEM;
>> +
>> + r5_cores = kcalloc(core_count,
>> + sizeof(struct zynqmp_r5_core *), GFP_KERNEL);
>> + if (!r5_cores) {
>> + kfree(child_devs);
>> + return -ENOMEM;
>> + }
>> +
>> + i = 0;
>> + for_each_available_child_of_node(dev_node, child) {
>> + child_pdev = of_find_device_by_node(child);
>> + if (!child_pdev) {
>> + of_node_put(child);
>> + ret = -ENODEV;
>> + goto release_r5_cores;
>> + }
>> +
>> + child_devs[i] = &child_pdev->dev;
>> +
>> + /* create and add remoteproc instance of type struct rproc */
>> + r5_cores[i] = zynqmp_r5_add_rproc_core(&child_pdev->dev);
>> + if (IS_ERR(r5_cores[i])) {
>> + of_node_put(child);
>> + ret = PTR_ERR(r5_cores[i]);
>> + goto release_r5_cores;
> If we are here and i == 0, we are leaking a reference to child_pdev since the
> loop in release_r5_cores won't execute.
>
>
>> + }
>> +
>> + i++;
>> +
>> + /*
>> + * If two child nodes are available in dts in lockstep mode,
>> + * then ignore second child node.
>> + */
>> + if (i == core_count) {
>> + of_node_put(child);
>> + break;
>> + }
> Instead of using the i to check the cores, simply break if cluster_mode ==
> LOCKSTEP_MODE. That will avoid the fragile dance around the manipulation of
> variable i and simplify the release of resources in release_r5_cores.
>
>
>> + }
>> +
>> + cluster->mode = cluster_mode;
>> + cluster->core_count = core_count;
>> + cluster->r5_cores = r5_cores;
>> +
>> + ret = zynqmp_r5_core_init(cluster, fw_reg_val, tcm_mode);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to init r5 core err %d\n", ret);
>> + cluster->core_count = 0;
>> + cluster->r5_cores = NULL;
>> + goto release_r5_cores;
>> + }
>> +
>> + kfree(child_devs);
>> + return 0;
>> +
>> +release_r5_cores:
>> + for (i--; i >= 0; i--) {
>> + put_device(child_devs[i]);
>> + rproc_del(r5_cores[i]->rproc);
>> + rproc_free(r5_cores[i]->rproc);
>> + }
>> + kfree(r5_cores);
>> + kfree(child_devs);
>> + return ret;
>> +}
>> +
>> +static void zynqmp_r5_cluster_exit(void *data)
>> +{
>> + struct platform_device *pdev = (struct platform_device *)data;
>> + struct zynqmp_r5_cluster *cluster;
>> + struct zynqmp_r5_core *r5_core;
>> + int i;
>> +
>> + cluster = (struct zynqmp_r5_cluster *)platform_get_drvdata(pdev);
>> + if (!cluster)
>> + return;
>> +
>> + for (i = 0; i < cluster->core_count; i++) {
>> + r5_core = cluster->r5_cores[i];
>> + put_device(r5_core->dev);
>> + rproc_del(r5_core->rproc);
>> + rproc_free(r5_core->rproc);
>> + }
>> +
>> + kfree(cluster->r5_cores);
>> + kfree(cluster);
>> + platform_set_drvdata(pdev, NULL);
>> +}
>> +
>> +/*
>> + * zynqmp_r5_remoteproc_probe()
>> + *
>> + * @pdev: domain platform device for R5 cluster
>> + *
>> + * called when driver is probed, for each R5 core specified in DT,
>> + * setup as needed to do remoteproc-related operations
>> + *
>> + * Return: 0 for success, negative value for failure.
>> + */
>> +static int zynqmp_r5_remoteproc_probe(struct platform_device *pdev)
>> +{
>> + struct zynqmp_r5_cluster *cluster;
>> + struct device *dev = &pdev->dev;
>> + int ret;
>> +
>> + cluster = kzalloc(sizeof(*cluster), GFP_KERNEL);
>> + if (!cluster)
>> + return -ENOMEM;
>> +
>> + cluster->dev = dev;
>> +
>> + ret = devm_of_platform_populate(dev);
>> + if (ret) {
>> + dev_err_probe(dev, ret, "failed to populate platform dev\n");
>> + kfree(cluster);
>> + return ret;
>> + }
>> +
>> + /* wire in so each core can be cleaned up at driver remove */
>> + platform_set_drvdata(pdev, cluster);
>> +
>> + ret = zynqmp_r5_cluster_init(cluster);
>> + if (ret) {
>> + zynqmp_r5_cluster_exit(pdev);
>> + dev_err_probe(dev, ret, "Invalid r5f subsystem device tree\n");
>> + return ret;
>> + }
>> +
>> + ret = devm_add_action_or_reset(dev, zynqmp_r5_cluster_exit, pdev);
>> + if (ret)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +/* Match table for OF platform binding */
>> +static const struct of_device_id zynqmp_r5_remoteproc_match[] = {
>> + { .compatible = "xlnx,zynqmp-r5fss", },
>> + { /* end of list */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, zynqmp_r5_remoteproc_match);
>> +
>> +static struct platform_driver zynqmp_r5_remoteproc_driver = {
>> + .probe = zynqmp_r5_remoteproc_probe,
>> + .driver = {
>> + .name = "zynqmp_r5_remoteproc",
>> + .of_match_table = zynqmp_r5_remoteproc_match,
>> + },
>> +};
>> +module_platform_driver(zynqmp_r5_remoteproc_driver);
>> +
>> +MODULE_DESCRIPTION("Xilinx R5F remote processor driver");
>> +MODULE_AUTHOR("Xilinx Inc.");
>> +MODULE_LICENSE("GPL");
> There is a discrepency between the GPL-2.0 in the SPDS identifier and the above.
// SPDX-License-Identifier: GPL-2.0
I will fix above as
// SPDX-License-Identifier: GPL
>
> More comments tomorrow or Tuesday.
>
> Thanks,
> Mathieu
>
>> --
>> 2.25.1
>>
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