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envelope-from=prvs=000118587=alistair.francis@opensource.wdc.com; helo=esa2.hgst.iphmx.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Alistair Francis We can remove the original sifive_plic_irqs_pending() function and instead just use the sifive_plic_claim() function (renamed to sifive_plic_claimed()) to determine if any interrupts are pending. This requires move the side effects outside of sifive_plic_claimed(), but as they are only invoked once that isn't a problem. We have also removed all of the old #ifdef debugging logs, so let's cleanup the last remaining debug function while we are here. Signed-off-by: Alistair Francis Reviewed-by: Bin Meng Message-Id: <20220105213937.1113508-5-alistair.francis@opensource.wdc.com= > --- hw/intc/sifive_plic.c | 109 +++++++++--------------------------------- 1 file changed, 22 insertions(+), 87 deletions(-) diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c index 44d24b3c59..746c0f0343 100644 --- a/hw/intc/sifive_plic.c +++ b/hw/intc/sifive_plic.c @@ -31,8 +31,6 @@ #include "migration/vmstate.h" #include "hw/irq.h" =20 -#define RISCV_DEBUG_PLIC 0 - static bool addr_between(uint32_t addr, uint32_t base, uint32_t num) { return addr >=3D base && addr - base < num; @@ -51,47 +49,6 @@ static PLICMode char_to_mode(char c) } } =20 -static char mode_to_char(PLICMode m) -{ - switch (m) { - case PLICMode_U: return 'U'; - case PLICMode_S: return 'S'; - case PLICMode_H: return 'H'; - case PLICMode_M: return 'M'; - default: return '?'; - } -} - -static void sifive_plic_print_state(SiFivePLICState *plic) -{ - int i; - int addrid; - - /* pending */ - qemu_log("pending : "); - for (i =3D plic->bitfield_words - 1; i >=3D 0; i--) { - qemu_log("%08x", plic->pending[i]); - } - qemu_log("\n"); - - /* pending */ - qemu_log("claimed : "); - for (i =3D plic->bitfield_words - 1; i >=3D 0; i--) { - qemu_log("%08x", plic->claimed[i]); - } - qemu_log("\n"); - - for (addrid =3D 0; addrid < plic->num_addrs; addrid++) { - qemu_log("hart%d-%c enable: ", - plic->addr_config[addrid].hartid, - mode_to_char(plic->addr_config[addrid].mode)); - for (i =3D plic->bitfield_words - 1; i >=3D 0; i--) { - qemu_log("%08x", plic->enable[addrid * plic->bitfield_words = + i]); - } - qemu_log("\n"); - } -} - static uint32_t atomic_set_masked(uint32_t *a, uint32_t mask, uint32_t v= alue) { uint32_t old, new, cmp =3D qatomic_read(a); @@ -115,26 +72,34 @@ static void sifive_plic_set_claimed(SiFivePLICState = *plic, int irq, bool level) atomic_set_masked(&plic->claimed[irq >> 5], 1 << (irq & 31), -!!leve= l); } =20 -static int sifive_plic_irqs_pending(SiFivePLICState *plic, uint32_t addr= id) +static uint32_t sifive_plic_claimed(SiFivePLICState *plic, uint32_t addr= id) { + uint32_t max_irq =3D 0; + uint32_t max_prio =3D plic->target_priority[addrid]; int i, j; + for (i =3D 0; i < plic->bitfield_words; i++) { uint32_t pending_enabled_not_claimed =3D - (plic->pending[i] & ~plic->claimed[i]) & - plic->enable[addrid * plic->bitfield_words + i]; + (plic->pending[i] & ~plic->claimed[i]) & + plic->enable[addrid * plic->bitfield_words += i]; + if (!pending_enabled_not_claimed) { continue; } + for (j =3D 0; j < 32; j++) { int irq =3D (i << 5) + j; uint32_t prio =3D plic->source_priority[irq]; int enabled =3D pending_enabled_not_claimed & (1 << j); - if (enabled && prio > plic->target_priority[addrid]) { - return 1; + + if (enabled && prio > max_prio) { + max_irq =3D irq; + max_prio =3D prio; } } } - return 0; + + return max_irq; } =20 static void sifive_plic_update(SiFivePLICState *plic) @@ -145,7 +110,7 @@ static void sifive_plic_update(SiFivePLICState *plic) for (addrid =3D 0; addrid < plic->num_addrs; addrid++) { uint32_t hartid =3D plic->addr_config[addrid].hartid; PLICMode mode =3D plic->addr_config[addrid].mode; - int level =3D sifive_plic_irqs_pending(plic, addrid); + bool level =3D !!sifive_plic_claimed(plic, addrid); =20 switch (mode) { case PLICMode_M: @@ -158,41 +123,6 @@ static void sifive_plic_update(SiFivePLICState *plic= ) break; } } - - if (RISCV_DEBUG_PLIC) { - sifive_plic_print_state(plic); - } -} - -static uint32_t sifive_plic_claim(SiFivePLICState *plic, uint32_t addrid= ) -{ - int i, j; - uint32_t max_irq =3D 0; - uint32_t max_prio =3D plic->target_priority[addrid]; - - for (i =3D 0; i < plic->bitfield_words; i++) { - uint32_t pending_enabled_not_claimed =3D - (plic->pending[i] & ~plic->claimed[i]) & - plic->enable[addrid * plic->bitfield_words + i]; - if (!pending_enabled_not_claimed) { - continue; - } - for (j =3D 0; j < 32; j++) { - int irq =3D (i << 5) + j; - uint32_t prio =3D plic->source_priority[irq]; - int enabled =3D pending_enabled_not_claimed & (1 << j); - if (enabled && prio > max_prio) { - max_irq =3D irq; - max_prio =3D prio; - } - } - } - - if (max_irq) { - sifive_plic_set_pending(plic, max_irq, false); - sifive_plic_set_claimed(plic, max_irq, true); - } - return max_irq; } =20 static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned siz= e) @@ -223,10 +153,15 @@ static uint64_t sifive_plic_read(void *opaque, hwad= dr addr, unsigned size) if (contextid =3D=3D 0) { return plic->target_priority[addrid]; } else if (contextid =3D=3D 4) { - uint32_t value =3D sifive_plic_claim(plic, addrid); + uint32_t max_irq =3D sifive_plic_claimed(plic, addrid); + + if (max_irq) { + sifive_plic_set_pending(plic, max_irq, false); + sifive_plic_set_claimed(plic, max_irq, true); + } =20 sifive_plic_update(plic); - return value; + return max_irq; } } =20 --=20 2.31.1