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Date: Wed, 13 Oct 2021 17:30:26 -0500
From: Alex Elder <elder@...e.org>
To: Sireesh Kodali <sireeshkodali1@...il.com>,
phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, elder@...nel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Subject: Re: [RFC PATCH 12/17] net: ipa: Add support for IPA v2.x memory map
On 9/19/21 10:08 PM, Sireesh Kodali wrote:
> IPA v2.6L has an extra region to handle compression/decompression
> acceleration. This region is used by some modems during modem init.
So it has to be initialized? (I guess so.)
The memory size register apparently doesn't express things in
units of 8 bytes either.
-Alex
> Signed-off-by: Sireesh Kodali <sireeshkodali1@...il.com>
> ---
> drivers/net/ipa/ipa_mem.c | 36 ++++++++++++++++++++++++++++++------
> drivers/net/ipa/ipa_mem.h | 5 ++++-
> 2 files changed, 34 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ipa/ipa_mem.c b/drivers/net/ipa/ipa_mem.c
> index 8acc88070a6f..bfcdc7e08de2 100644
> --- a/drivers/net/ipa/ipa_mem.c
> +++ b/drivers/net/ipa/ipa_mem.c
> @@ -84,7 +84,7 @@ int ipa_mem_setup(struct ipa *ipa)
> /* Get a transaction to define the header memory region and to zero
> * the processing context and modem memory regions.
> */
> - trans = ipa_cmd_trans_alloc(ipa, 4);
> + trans = ipa_cmd_trans_alloc(ipa, 5);
> if (!trans) {
> dev_err(&ipa->pdev->dev, "no transaction for memory setup\n");
> return -EBUSY;
> @@ -107,8 +107,14 @@ int ipa_mem_setup(struct ipa *ipa)
> ipa_mem_zero_region_add(trans, IPA_MEM_AP_PROC_CTX);
> ipa_mem_zero_region_add(trans, IPA_MEM_MODEM);
>
> + ipa_mem_zero_region_add(trans, IPA_MEM_ZIP);
> +
> ipa_trans_commit_wait(trans);
>
> + /* On IPA version <=2.6L (except 2.5) there is no PROC_CTX. */
> + if (ipa->version != IPA_VERSION_2_5 && ipa->version <= IPA_VERSION_2_6L)
> + return 0;
> +
> /* Tell the hardware where the processing context area is located */
> mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX);
> offset = ipa->mem_offset + mem->offset;
> @@ -147,6 +153,11 @@ static bool ipa_mem_id_valid(struct ipa *ipa, enum ipa_mem_id mem_id)
> case IPA_MEM_END_MARKER: /* pseudo region */
> break;
>
> + case IPA_MEM_ZIP:
> + if (version == IPA_VERSION_2_6L)
> + return true;
> + break;
> +
> case IPA_MEM_STATS_TETHERING:
> case IPA_MEM_STATS_DROP:
> if (version < IPA_VERSION_4_0)
> @@ -319,10 +330,15 @@ int ipa_mem_config(struct ipa *ipa)
> /* Check the advertised location and size of the shared memory area */
> val = ioread32(ipa->reg_virt + ipa_reg_shared_mem_size_offset(ipa->version));
>
> - /* The fields in the register are in 8 byte units */
> - ipa->mem_offset = 8 * u32_get_bits(val, SHARED_MEM_BADDR_FMASK);
> - /* Make sure the end is within the region's mapped space */
> - mem_size = 8 * u32_get_bits(val, SHARED_MEM_SIZE_FMASK);
> + if (IPA_VERSION_RANGE(ipa->version, 2_0, 2_6L)) {
> + /* The fields in the register are in 8 byte units */
> + ipa->mem_offset = 8 * u32_get_bits(val, SHARED_MEM_BADDR_FMASK);
> + /* Make sure the end is within the region's mapped space */
> + mem_size = 8 * u32_get_bits(val, SHARED_MEM_SIZE_FMASK);
> + } else {
> + ipa->mem_offset = u32_get_bits(val, SHARED_MEM_BADDR_FMASK);
> + mem_size = u32_get_bits(val, SHARED_MEM_SIZE_FMASK);
> + }
>
> /* If the sizes don't match, issue a warning */
> if (ipa->mem_offset + mem_size < ipa->mem_size) {
> @@ -564,6 +580,10 @@ static int ipa_smem_init(struct ipa *ipa, u32 item, size_t size)
> return -EINVAL;
> }
>
> + /* IPA v2.6L does not use IOMMU */
> + if (ipa->version <= IPA_VERSION_2_6L)
> + return 0;
> +
> domain = iommu_get_domain_for_dev(dev);
> if (!domain) {
> dev_err(dev, "no IOMMU domain found for SMEM\n");
> @@ -591,6 +611,9 @@ static void ipa_smem_exit(struct ipa *ipa)
> struct device *dev = &ipa->pdev->dev;
> struct iommu_domain *domain;
>
> + if (ipa->version <= IPA_VERSION_2_6L)
> + return;
> +
> domain = iommu_get_domain_for_dev(dev);
> if (domain) {
> size_t size;
> @@ -622,7 +645,8 @@ int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data)
> ipa->mem_count = mem_data->local_count;
> ipa->mem = mem_data->local;
>
> - ret = dma_set_mask_and_coherent(&ipa->pdev->dev, DMA_BIT_MASK(64));
> + ret = dma_set_mask_and_coherent(&ipa->pdev->dev, IPA_IS_64BIT(ipa->version) ?
> + DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
> if (ret) {
> dev_err(dev, "error %d setting DMA mask\n", ret);
> return ret;
> diff --git a/drivers/net/ipa/ipa_mem.h b/drivers/net/ipa/ipa_mem.h
> index 570bfdd99bff..be91cb38b6a8 100644
> --- a/drivers/net/ipa/ipa_mem.h
> +++ b/drivers/net/ipa/ipa_mem.h
> @@ -47,8 +47,10 @@ enum ipa_mem_id {
> IPA_MEM_UC_INFO, /* 0 canaries */
> IPA_MEM_V4_FILTER_HASHED, /* 2 canaries */
> IPA_MEM_V4_FILTER, /* 2 canaries */
> + IPA_MEM_V4_FILTER_AP, /* 2 canaries (IPA v2.0) */
> IPA_MEM_V6_FILTER_HASHED, /* 2 canaries */
> IPA_MEM_V6_FILTER, /* 2 canaries */
> + IPA_MEM_V6_FILTER_AP, /* 0 canaries (IPA v2.0) */
> IPA_MEM_V4_ROUTE_HASHED, /* 2 canaries */
> IPA_MEM_V4_ROUTE, /* 2 canaries */
> IPA_MEM_V6_ROUTE_HASHED, /* 2 canaries */
> @@ -57,7 +59,8 @@ enum ipa_mem_id {
> IPA_MEM_AP_HEADER, /* 0 canaries, optional */
> IPA_MEM_MODEM_PROC_CTX, /* 2 canaries */
> IPA_MEM_AP_PROC_CTX, /* 0 canaries */
> - IPA_MEM_MODEM, /* 0/2 canaries */
> + IPA_MEM_ZIP, /* 1 canary (IPA v2.6L) */
> + IPA_MEM_MODEM, /* 0-2 canaries */
> IPA_MEM_UC_EVENT_RING, /* 1 canary, optional */
> IPA_MEM_PDN_CONFIG, /* 0/2 canaries (IPA v4.0+) */
> IPA_MEM_STATS_QUOTA_MODEM, /* 2/4 canaries (IPA v4.0+) */
>
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