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Date: Fri, 1 Oct 2021 10:08:15 +0300
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Bjorn Andersson <bjorn.andersson@...aro.org>,
Andy Gross <agross@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Chris Lew <clew@...eaurora.org>,
Deepak Kumar Singh <deesin@...eaurora.org>
Subject: Re: [PATCH v2 3/4] soc: qcom: smem: Support reserved-memory
description
Hi Bjorn,
On 9/30/21 9:21 PM, Bjorn Andersson wrote:
> Practically all modern Qualcomm platforms has a single reserved-memory
> region for SMEM. So rather than having to describe SMEM in the form of a
> node with a reference to a reserved-memory node, allow the SMEM device
> to be instantiated directly from the reserved-memory node.
>
> The current means of falling back to dereferencing the "memory-region"
> is kept as a fallback, if it's determined that the SMEM node is a
> reserved-memory node.
>
> The "qcom,smem" compatible is added to the reserved_mem_matches list, to
> allow the reserved-memory device to be probed.
>
> In order to retain the readability of the code, the resolution of
> resources is split from the actual ioremapping.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>
> Changes since v1:
> - None
>
> drivers/of/platform.c | 1 +
> drivers/soc/qcom/smem.c | 57 ++++++++++++++++++++++++++++-------------
> 2 files changed, 40 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/of/platform.c b/drivers/of/platform.c
> index 32d5ff8df747..07813fb1ef37 100644
> --- a/drivers/of/platform.c
> +++ b/drivers/of/platform.c
> @@ -505,6 +505,7 @@ EXPORT_SYMBOL_GPL(of_platform_default_populate);
> static const struct of_device_id reserved_mem_matches[] = {
> { .compatible = "qcom,rmtfs-mem" },
> { .compatible = "qcom,cmd-db" },
> + { .compatible = "qcom,smem" },
> { .compatible = "ramoops" },
> { .compatible = "nvmem-rmem" },
> {}
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index 4fb5aeeb0843..c7e519bfdc8a 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -9,6 +9,7 @@
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/of_address.h>
> +#include <linux/of_reserved_mem.h>
> #include <linux/platform_device.h>
> #include <linux/sizes.h>
> #include <linux/slab.h>
> @@ -240,7 +241,7 @@ static const u8 SMEM_INFO_MAGIC[] = { 0x53, 0x49, 0x49, 0x49 }; /* SIII */
> * @size: size of the memory region
> */
> struct smem_region {
> - u32 aux_base;
> + phys_addr_t aux_base;
> void __iomem *virt_base;
> size_t size;
> };
> @@ -499,7 +500,7 @@ static void *qcom_smem_get_global(struct qcom_smem *smem,
> for (i = 0; i < smem->num_regions; i++) {
> region = &smem->regions[i];
>
> - if (region->aux_base == aux_base || !aux_base) {
> + if ((u32)region->aux_base == aux_base || !aux_base) {
> if (size != NULL)
> *size = le32_to_cpu(entry->size);
> return region->virt_base + le32_to_cpu(entry->offset);
> @@ -664,7 +665,7 @@ phys_addr_t qcom_smem_virt_to_phys(void *p)
> if (p < region->virt_base + region->size) {
> u64 offset = p - region->virt_base;
>
> - return (phys_addr_t)region->aux_base + offset;
> + return region->aux_base + offset;
> }
> }
>
> @@ -863,12 +864,12 @@ qcom_smem_enumerate_partitions(struct qcom_smem *smem, u16 local_host)
> return 0;
> }
>
> -static int qcom_smem_map_memory(struct qcom_smem *smem, struct device *dev,
> - const char *name, int i)
> +static int qcom_smem_resolve_mem(struct qcom_smem *smem, const char *name,
> + struct smem_region *region)
> {
> + struct device *dev = smem->dev;
> struct device_node *np;
> struct resource r;
> - resource_size_t size;
> int ret;
>
> np = of_parse_phandle(dev->of_node, name, 0);
> @@ -881,13 +882,9 @@ static int qcom_smem_map_memory(struct qcom_smem *smem, struct device *dev,
> of_node_put(np);
> if (ret)
> return ret;
> - size = resource_size(&r);
>
> - smem->regions[i].virt_base = devm_ioremap_wc(dev, r.start, size);
> - if (!smem->regions[i].virt_base)
> - return -ENOMEM;
> - smem->regions[i].aux_base = (u32)r.start;
> - smem->regions[i].size = size;
> + region->aux_base = r.start;
> + region->size = resource_size(&r);
>
> return 0;
> }
> @@ -895,12 +892,14 @@ static int qcom_smem_map_memory(struct qcom_smem *smem, struct device *dev,
> static int qcom_smem_probe(struct platform_device *pdev)
> {
> struct smem_header *header;
> + struct reserved_mem *rmem;
> struct qcom_smem *smem;
> size_t array_size;
> int num_regions;
> int hwlock_id;
> u32 version;
> int ret;
> + int i;
Just a nitpicking, the index can be unsigned.
>
> num_regions = 1;
> if (of_find_property(pdev->dev.of_node, "qcom,rpm-msg-ram", NULL))
> @@ -914,13 +913,35 @@ static int qcom_smem_probe(struct platform_device *pdev)
> smem->dev = &pdev->dev;
> smem->num_regions = num_regions;
>
> - ret = qcom_smem_map_memory(smem, &pdev->dev, "memory-region", 0);
> - if (ret)
> - return ret;
> + rmem = of_reserved_mem_lookup(pdev->dev.of_node);
> + if (rmem) {
> + smem->regions[0].aux_base = rmem->base;
> + smem->regions[0].size = rmem->size;
> + } else {
> + /*
> + * Fall back to the memory-region reference, if we're not a
> + * reserved-memory node.
> + */
> + ret = qcom_smem_resolve_mem(smem, "memory-region", &smem->regions[0]);
> + if (ret)
> + return ret;
> + }
>
> - if (num_regions > 1 && (ret = qcom_smem_map_memory(smem, &pdev->dev,
> - "qcom,rpm-msg-ram", 1)))
> - return ret;
> + if (num_regions > 1) {
> + ret = qcom_smem_resolve_mem(smem, "qcom,rpm-msg-ram", &smem->regions[1]);
> + if (ret)
> + return ret;
> + }
> +
> + for (i = 0; i < num_regions; i++) {
> + smem->regions[i].virt_base = devm_ioremap_wc(&pdev->dev,
> + smem->regions[i].aux_base,
> + smem->regions[i].size);
> + if (!smem->regions[i].virt_base) {
> + dev_err(&pdev->dev, "failed to remap %pa\n", &smem->regions[i].aux_base);
> + return -ENOMEM;
> + }
> + }
>
> header = smem->regions[0].virt_base;
> if (le32_to_cpu(header->initialized) != 1 ||
>
--
Best wishes,
Vladimir
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