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Date: Wed, 14 Jul 2021 19:37:51 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Jassi Brar <jassisinghbrar@...il.com>
Subject: Re: [PATCH 10/13] mailbox: pcc: Avoid accessing PCCT table in
pcc_send_data and pcc_mbox_irq
On Thu, Jul 08, 2021 at 07:08:48PM +0100, Sudeep Holla wrote:
> Now that the con_priv is availvale solely for PCC mailbox controller
nit: s/availvale/available
> driver, let us use the same to save the channel specific information
> in it so that we can it whenever required instead of parsing the PCCT
> table entries every time in both pcc_send_data and pcc_mbox_irq.
>
> We can now use the newly introduces PCC register bundle to simplify both
> saving of channel specific information and accessing them without repeated
> checks for the subspace type.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
Reviewed-by: Cristian Marussi <cristian.marussi@....com>
Thanks,
Cristian
> drivers/mailbox/pcc.c | 116 +++++++++++-------------------------------
> 1 file changed, 30 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
> index 7d48e5c1ac52..237dba9cb445 100644
> --- a/drivers/mailbox/pcc.c
> +++ b/drivers/mailbox/pcc.c
> @@ -86,15 +86,15 @@ struct pcc_chan_reg {
> * struct pcc_chan_info - PCC channel specific information
> *
> * @chan: PCC channel information with Shared Memory Region info
> - * @db_vaddr: cached virtual address for doorbell register
> - * @plat_irq_ack_vaddr: cached virtual address for platform interrupt
> - * acknowledge register
> + * @db: PCC register bundle for the doorbell register
> + * @plat_irq_ack: PCC register bundle for the platform interrupt acknowledge
> + * register
> * @db_irq: doorbell interrupt
> */
> struct pcc_chan_info {
> struct pcc_mbox_chan chan;
> - void __iomem *db_vaddr;
> - void __iomem *plat_irq_ack_vaddr;
> + struct pcc_chan_reg db;
> + struct pcc_chan_reg plat_irq_ack;
> int db_irq;
> };
>
> @@ -242,40 +242,15 @@ static int pcc_map_interrupt(u32 interrupt, u32 flags)
> */
> static irqreturn_t pcc_mbox_irq(int irq, void *p)
> {
> - struct acpi_generic_address *doorbell_ack;
> - struct acpi_pcct_hw_reduced *pcct_ss;
> struct pcc_chan_info *pchan;
> struct mbox_chan *chan = p;
> - u64 doorbell_ack_preserve;
> - u64 doorbell_ack_write;
> - u64 doorbell_ack_val;
> - int ret;
>
> - pcct_ss = chan->con_priv;
> + pchan = chan->con_priv;
>
> mbox_chan_received_data(chan, NULL);
>
> - if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
> - struct acpi_pcct_hw_reduced_type2 *pcct2_ss = chan->con_priv;
> - u32 id = chan - pcc_mbox_channels;
> -
> - pchan = chan_info + id;
> - doorbell_ack = &pcct2_ss->platform_ack_register;
> - doorbell_ack_preserve = pcct2_ss->ack_preserve_mask;
> - doorbell_ack_write = pcct2_ss->ack_write_mask;
> -
> - ret = read_register(pchan->plat_irq_ack_vaddr,
> - &doorbell_ack_val, doorbell_ack->bit_width);
> - if (ret)
> - return IRQ_NONE;
> -
> - ret = write_register(pchan->plat_irq_ack_vaddr,
> - (doorbell_ack_val & doorbell_ack_preserve)
> - | doorbell_ack_write,
> - doorbell_ack->bit_width);
> - if (ret)
> - return IRQ_NONE;
> - }
> + if (pcc_chan_reg_read_modify_write(&pchan->plat_irq_ack))
> + return IRQ_NONE;
>
> return IRQ_HANDLED;
> }
> @@ -376,42 +351,9 @@ EXPORT_SYMBOL_GPL(pcc_mbox_free_channel);
> */
> static int pcc_send_data(struct mbox_chan *chan, void *data)
> {
> - struct acpi_pcct_hw_reduced *pcct_ss = chan->con_priv;
> - struct acpi_generic_address *doorbell;
> - struct pcc_chan_info *pchan;
> - u64 doorbell_preserve;
> - u64 doorbell_val;
> - u64 doorbell_write;
> - u32 id = chan - pcc_mbox_channels;
> - int ret = 0;
> -
> - if (id >= pcc_mbox_ctrl.num_chans) {
> - pr_debug("pcc_send_data: Invalid mbox_chan passed\n");
> - return -ENOENT;
> - }
> + struct pcc_chan_info *pchan = chan->con_priv;
>
> - pchan = chan_info + id;
> - doorbell = &pcct_ss->doorbell_register;
> - doorbell_preserve = pcct_ss->preserve_mask;
> - doorbell_write = pcct_ss->write_mask;
> -
> - /* Sync notification from OS to Platform. */
> - if (pchan->db_vaddr) {
> - ret = read_register(pchan->db_vaddr, &doorbell_val,
> - doorbell->bit_width);
> - if (ret)
> - return ret;
> - ret = write_register(pchan->db_vaddr,
> - (doorbell_val & doorbell_preserve)
> - | doorbell_write, doorbell->bit_width);
> - } else {
> - ret = acpi_read(&doorbell_val, doorbell);
> - if (ret)
> - return ret;
> - ret = acpi_write((doorbell_val & doorbell_preserve) | doorbell_write,
> - doorbell);
> - }
> - return ret;
> + return pcc_chan_reg_read_modify_write(&pchan->db);
> }
>
> static const struct mbox_chan_ops pcc_chan_ops = {
> @@ -479,6 +421,7 @@ pcc_chan_reg_init(struct pcc_chan_reg *reg, struct acpi_generic_address *gas,
> static int pcc_parse_subspace_irq(struct pcc_chan_info *pchan,
> struct acpi_subtable_header *pcct_entry)
> {
> + int ret = 0;
> struct acpi_pcct_hw_reduced *pcct_ss;
>
> if (pcct_entry->type < ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE ||
> @@ -497,16 +440,14 @@ static int pcc_parse_subspace_irq(struct pcc_chan_info *pchan,
> if (pcct_ss->header.type == ACPI_PCCT_TYPE_HW_REDUCED_SUBSPACE_TYPE2) {
> struct acpi_pcct_hw_reduced_type2 *pcct2_ss = (void *)pcct_ss;
>
> - pchan->plat_irq_ack_vaddr =
> - acpi_os_ioremap(pcct2_ss->platform_ack_register.address,
> - pcct2_ss->platform_ack_register.bit_width / 8);
> - if (!pchan->plat_irq_ack_vaddr) {
> - pr_err("Failed to ioremap PCC ACK register\n");
> - return -ENOMEM;
> - }
> + ret = pcc_chan_reg_init(&pchan->plat_irq_ack,
> + &pcct2_ss->platform_ack_register,
> + pcct2_ss->ack_preserve_mask,
> + pcct2_ss->ack_write_mask, 0,
> + "PLAT IRQ ACK");
> }
>
> - return 0;
> + return ret;
> }
>
> /**
> @@ -516,19 +457,20 @@ static int pcc_parse_subspace_irq(struct pcc_chan_info *pchan,
> * @pcct_entry: Pointer to the ACPI subtable header.
> *
> */
> -static void pcc_parse_subspace_db_reg(struct pcc_chan_info *pchan,
> - struct acpi_subtable_header *pcct_entry)
> +static int pcc_parse_subspace_db_reg(struct pcc_chan_info *pchan,
> + struct acpi_subtable_header *pcct_entry)
> {
> + int ret = 0;
> +
> struct acpi_pcct_subspace *pcct_ss;
> - struct acpi_generic_address *db_reg;
>
> pcct_ss = (struct acpi_pcct_subspace *)pcct_entry;
>
> - /* If doorbell is in system memory cache the virt address */
> - db_reg = &pcct_ss->doorbell_register;
> - if (db_reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
> - pchan->db_vaddr = acpi_os_ioremap(db_reg->address,
> - db_reg->bit_width / 8);
> + ret = pcc_chan_reg_init(&pchan->db,
> + &pcct_ss->doorbell_register,
> + pcct_ss->preserve_mask,
> + pcct_ss->write_mask, 0, "Doorbell");
> + return ret;
> }
>
> /**
> @@ -617,8 +559,8 @@ static int __init acpi_pcc_probe(void)
>
> for (i = 0; i < count; i++) {
> struct pcc_chan_info *pchan = chan_info + i;
> - pcc_mbox_channels[i].con_priv = pcct_entry;
>
> + pcc_mbox_channels[i].con_priv = pchan;
> pchan->chan.mchan = &pcc_mbox_channels[i];
>
> if (pcc_mbox_ctrl.txdone_irq) {
> @@ -626,7 +568,9 @@ static int __init acpi_pcc_probe(void)
> if (rc < 0)
> goto err;
> }
> - pcc_parse_subspace_db_reg(pchan, pcct_entry);
> + rc = pcc_parse_subspace_db_reg(pchan, pcct_entry);
> + if (rc < 0)
> + goto err;
>
> pcc_parse_subspace_shmem(pchan, pcct_entry);
>
> --
> 2.25.1
>
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